musix-oss/node_modules/@firebase/webchannel-wrapper/dist/index.esm.js.map

{"version":3,"file":"index.esm.js","sources":["../../../node_modules/closure-builder/third_party/closure-library/closure/goog/base.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/disposable/disposable.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/array/array.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/net/xhrio.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/string/internal.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/useragent/util.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/object/object.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/reflect/reflect.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/useragent/useragent.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/useragent/browser.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/useragent/engine.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/events/browserfeature.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/events/event.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/events/browserevent.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/events/eventtype.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/events/listenable.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/events/listener.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/events/listenermap.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/events/events.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/events/eventtarget.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/json/json.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/async/freelist.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/async/workqueue.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/async/run.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/async/nexttick.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/timer/timer.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/async/throttle.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/events/eventhandler.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/net/webchannel/webchanneldebug.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/net/webchannel/requeststats.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/net/errorcode.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/net/eventtype.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/net/xmlhttpfactory.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/net/xmlhttp.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/net/webchannel.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/net/webchannel/channelrequest.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/net/webchannel/environment.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/net/webchannel/webchannelbase.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/string/string.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/structs/structs.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/structs/map.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/uri/utils.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/uri/uri.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/debug/formatter.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/net/webchannel/basetestchannel.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/net/webchannel/wirev8.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/labs/net/webchannel/connectionstate.js","../../../node_modules/closure-builder/third_party/closure-library/closure/goog/structs/set.js","../../../node_modules/closure-bui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Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Bootstrap for the Google JS Library (Closure).\r\n *\r\n * In uncompiled mode base.js will attempt to load Closure's deps file, unless\r\n * the global <code>CLOSURE_NO_DEPS</code> is set to true.  This allows projects\r\n * to include their own deps file(s) from different locations.\r\n *\r\n * Avoid including base.js more than once. This is strictly discouraged and not\r\n * supported. goog.require(...) won't work properly in that case.\r\n *\r\n * @provideGoog\r\n */\r\n\r\n\r\n/**\r\n * @define {boolean} Overridden to true by the compiler.\r\n */\r\nvar COMPILED = false;\r\n\r\n\r\n/**\r\n * Base namespace for the Closure library.  Checks to see goog is already\r\n * defined in the current scope before assigning to prevent clobbering if\r\n * base.js is loaded more than once.\r\n *\r\n * @const\r\n */\r\nvar goog = goog || {};\r\n\r\n/**\r\n * Reference to the global context.  In most cases this will be 'window'.\r\n * @const\r\n * @suppress {newCheckTypes}\r\n */\r\ngoog.global = this;\r\n\r\n\r\n/**\r\n * A hook for overriding the define values in uncompiled mode.\r\n *\r\n * In uncompiled mode, `CLOSURE_UNCOMPILED_DEFINES` may be defined before\r\n * loading base.js.  If a key is defined in `CLOSURE_UNCOMPILED_DEFINES`,\r\n * `goog.define` will use the value instead of the default value.  This\r\n * allows flags to be overwritten without compilation (this is normally\r\n * accomplished with the compiler's \"define\" flag).\r\n *\r\n * Example:\r\n * <pre>\r\n *   var CLOSURE_UNCOMPILED_DEFINES = {'goog.DEBUG': false};\r\n * </pre>\r\n *\r\n * @type {Object<string, (string|number|boolean)>|undefined}\r\n */\r\ngoog.global.CLOSURE_UNCOMPILED_DEFINES;\r\n\r\n\r\n/**\r\n * A hook for overriding the define values in uncompiled or compiled mode,\r\n * like CLOSURE_UNCOMPILED_DEFINES but effective in compiled code.  In\r\n * uncompiled code CLOSURE_UNCOMPILED_DEFINES takes precedence.\r\n *\r\n * Also unlike CLOSURE_UNCOMPILED_DEFINES the values must be number, boolean or\r\n * string literals or the compiler will emit an error.\r\n *\r\n * While any @define value may be set, only those set with goog.define will be\r\n * effective for uncompiled code.\r\n *\r\n * Example:\r\n * <pre>\r\n *   var CLOSURE_DEFINES = {'goog.DEBUG': false} ;\r\n * </pre>\r\n *\r\n * @type {Object<string, (string|number|boolean)>|undefined}\r\n */\r\ngoog.global.CLOSURE_DEFINES;\r\n\r\n\r\n/**\r\n * Returns true if the specified value is not undefined.\r\n *\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is defined.\r\n */\r\ngoog.isDef = function(val) {\r\n  // void 0 always evaluates to undefined and hence we do not need to depend on\r\n  // the definition of the global variable named 'undefined'.\r\n  return val !== void 0;\r\n};\r\n\r\n/**\r\n * Returns true if the specified value is a string.\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is a string.\r\n */\r\ngoog.isString = function(val) {\r\n  return typeof val == 'string';\r\n};\r\n\r\n\r\n/**\r\n * Returns true if the specified value is a boolean.\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is boolean.\r\n */\r\ngoog.isBoolean = function(val) {\r\n  return typeof val == 'boolean';\r\n};\r\n\r\n\r\n/**\r\n * Returns true if the specified value is a number.\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is a number.\r\n */\r\ngoog.isNumber = function(val) {\r\n  return typeof val == 'number';\r\n};\r\n\r\n\r\n/**\r\n * Builds an object structure for the provided namespace path, ensuring that\r\n * names that already exist are not overwritten. For example:\r\n * \"a.b.c\" -> a = {};a.b={};a.b.c={};\r\n * Used by goog.provide and goog.exportSymbol.\r\n * @param {string} name name of the object that this file defines.\r\n * @param {*=} opt_object the object to expose at the end of the path.\r\n * @param {Object=} opt_objectToExportTo The object to add the path to; default\r\n *     is `goog.global`.\r\n * @private\r\n */\r\ngoog.exportPath_ = function(name, opt_object, opt_objectToExportTo) {\r\n  var parts = name.split('.');\r\n  var cur = opt_objectToExportTo || goog.global;\r\n\r\n  // Internet Explorer exhibits strange behavior when throwing errors from\r\n  // methods externed in this manner.  See the testExportSymbolExceptions in\r\n  // base_test.html for an example.\r\n  if (!(parts[0] in cur) && typeof cur.execScript != 'undefined') {\r\n    cur.execScript('var ' + parts[0]);\r\n  }\r\n\r\n  for (var part; parts.length && (part = parts.shift());) {\r\n    if (!parts.length && goog.isDef(opt_object)) {\r\n      // last part and we have an object; use it\r\n      cur[part] = opt_object;\r\n    } else if (cur[part] && cur[part] !== Object.prototype[part]) {\r\n      cur = cur[part];\r\n    } else {\r\n      cur = cur[part] = {};\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Defines a named value. In uncompiled mode, the value is retrieved from\r\n * CLOSURE_DEFINES or CLOSURE_UNCOMPILED_DEFINES if the object is defined and\r\n * has the property specified, and otherwise used the defined defaultValue.\r\n * When compiled the default can be overridden using the compiler options or the\r\n * value set in the CLOSURE_DEFINES object. Returns the defined value so that it\r\n * can be used safely in modules. Note that the value type MUST be either\r\n * boolean, number, or string.\r\n *\r\n * @param {string} name The distinguished name to provide.\r\n * @param {T} defaultValue\r\n * @return {T} The defined value.\r\n * @template T\r\n */\r\ngoog.define = function(name, defaultValue) {\r\n  var value = defaultValue;\r\n  if (!COMPILED) {\r\n    var uncompiledDefines = goog.global.CLOSURE_UNCOMPILED_DEFINES;\r\n    var defines = goog.global.CLOSURE_DEFINES;\r\n    if (uncompiledDefines &&\r\n        // Anti DOM-clobbering runtime check (b/37736576).\r\n        /** @type {?} */ (uncompiledDefines).nodeType === undefined &&\r\n        Object.prototype.hasOwnProperty.call(uncompiledDefines, name)) {\r\n      value = uncompiledDefines[name];\r\n    } else if (\r\n        defines &&\r\n        // Anti DOM-clobbering runtime check (b/37736576).\r\n        /** @type {?} */ (defines).nodeType === undefined &&\r\n        Object.prototype.hasOwnProperty.call(defines, name)) {\r\n      value = defines[name];\r\n    }\r\n  }\r\n  goog.exportPath_(name, value);\r\n  return value;\r\n};\r\n\r\n\r\n/**\r\n * @define {number} Integer year indicating the set of browser features that are\r\n * guaranteed to be present.  This is defined to include exactly features that\r\n * work correctly on all \"modern\" browsers that are stable on January 1 of the\r\n * specified year.  For example,\r\n * ```js\r\n * if (goog.FEATURESET_YEAR >= 2019) {\r\n *   // use APIs known to be available on all major stable browsers Jan 1, 2019\r\n * } else {\r\n *   // polyfill for older browsers\r\n * }\r\n * ```\r\n * This is intended to be the primary define for removing\r\n * unnecessary browser compatibility code (such as ponyfills and workarounds),\r\n * and should inform the default value for most other defines:\r\n * ```js\r\n * const ASSUME_NATIVE_PROMISE =\r\n *     goog.define('ASSUME_NATIVE_PROMISE', goog.FEATURESET_YEAR >= 2016);\r\n * ```\r\n *\r\n * The default assumption is that IE9 is the lowest supported browser, which was\r\n * first available Jan 1, 2012.\r\n *\r\n * TODO(user): Reference more thorough documentation when it's available.\r\n */\r\ngoog.FEATURESET_YEAR = goog.define('goog.FEATURESET_YEAR', 2012);\r\n\r\n\r\n/**\r\n * @define {boolean} DEBUG is provided as a convenience so that debugging code\r\n * that should not be included in a production. It can be easily stripped\r\n * by specifying --define goog.DEBUG=false to the Closure Compiler aka\r\n * JSCompiler. For example, most toString() methods should be declared inside an\r\n * \"if (goog.DEBUG)\" conditional because they are generally used for debugging\r\n * purposes and it is difficult for the JSCompiler to statically determine\r\n * whether they are used.\r\n */\r\ngoog.DEBUG = goog.define('goog.DEBUG', true);\r\n\r\n\r\n/**\r\n * @define {string} LOCALE defines the locale being used for compilation. It is\r\n * used to select locale specific data to be compiled in js binary. BUILD rule\r\n * can specify this value by \"--define goog.LOCALE=<locale_name>\" as a compiler\r\n * option.\r\n *\r\n * Take into account that the locale code format is important. You should use\r\n * the canonical Unicode format with hyphen as a delimiter. Language must be\r\n * lowercase, Language Script - Capitalized, Region - UPPERCASE.\r\n * There are few examples: pt-BR, en, en-US, sr-Latin-BO, zh-Hans-CN.\r\n *\r\n * See more info about locale codes here:\r\n * http://www.unicode.org/reports/tr35/#Unicode_Language_and_Locale_Identifiers\r\n *\r\n * For language codes you should use values defined by ISO 693-1. See it here\r\n * http://www.w3.org/WAI/ER/IG/ert/iso639.htm. There is only one exception from\r\n * this rule: the Hebrew language. For legacy reasons the old code (iw) should\r\n * be used instead of the new code (he).\r\n *\r\n */\r\ngoog.LOCALE = goog.define('goog.LOCALE', 'en');  // default to en\r\n\r\n\r\n/**\r\n * @define {boolean} Whether this code is running on trusted sites.\r\n *\r\n * On untrusted sites, several native functions can be defined or overridden by\r\n * external libraries like Prototype, Datejs, and JQuery and setting this flag\r\n * to false forces closure to use its own implementations when possible.\r\n *\r\n * If your JavaScript can be loaded by a third party site and you are wary about\r\n * relying on non-standard implementations, specify\r\n * \"--define goog.TRUSTED_SITE=false\" to the compiler.\r\n */\r\ngoog.TRUSTED_SITE = goog.define('goog.TRUSTED_SITE', true);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether a project is expected to be running in strict mode.\r\n *\r\n * This define can be used to trigger alternate implementations compatible with\r\n * running in EcmaScript Strict mode or warn about unavailable functionality.\r\n * @see https://goo.gl/PudQ4y\r\n *\r\n */\r\ngoog.STRICT_MODE_COMPATIBLE = goog.define('goog.STRICT_MODE_COMPATIBLE', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether code that calls {@link goog.setTestOnly} should\r\n *     be disallowed in the compilation unit.\r\n */\r\ngoog.DISALLOW_TEST_ONLY_CODE =\r\n    goog.define('goog.DISALLOW_TEST_ONLY_CODE', COMPILED && !goog.DEBUG);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether to use a Chrome app CSP-compliant method for\r\n *     loading scripts via goog.require. @see appendScriptSrcNode_.\r\n */\r\ngoog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING =\r\n    goog.define('goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING', false);\r\n\r\n\r\n/**\r\n * Defines a namespace in Closure.\r\n *\r\n * A namespace may only be defined once in a codebase. It may be defined using\r\n * goog.provide() or goog.module().\r\n *\r\n * The presence of one or more goog.provide() calls in a file indicates\r\n * that the file defines the given objects/namespaces.\r\n * Provided symbols must not be null or undefined.\r\n *\r\n * In addition, goog.provide() creates the object stubs for a namespace\r\n * (for example, goog.provide(\"goog.foo.bar\") will create the object\r\n * goog.foo.bar if it does not already exist).\r\n *\r\n * Build tools also scan for provide/require/module statements\r\n * to discern dependencies, build dependency files (see deps.js), etc.\r\n *\r\n * @see goog.require\r\n * @see goog.module\r\n * @param {string} name Namespace provided by this file in the form\r\n *     \"goog.package.part\".\r\n */\r\ngoog.provide = function(name) {\r\n  if (goog.isInModuleLoader_()) {\r\n    throw new Error('goog.provide cannot be used within a module.');\r\n  }\r\n  if (!COMPILED) {\r\n    // Ensure that the same namespace isn't provided twice.\r\n    // A goog.module/goog.provide maps a goog.require to a specific file\r\n    if (goog.isProvided_(name)) {\r\n      throw new Error('Namespace \"' + name + '\" already declared.');\r\n    }\r\n  }\r\n\r\n  goog.constructNamespace_(name);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} name Namespace provided by this file in the form\r\n *     \"goog.package.part\".\r\n * @param {Object=} opt_obj The object to embed in the namespace.\r\n * @private\r\n */\r\ngoog.constructNamespace_ = function(name, opt_obj) {\r\n  if (!COMPILED) {\r\n    delete goog.implicitNamespaces_[name];\r\n\r\n    var namespace = name;\r\n    while ((namespace = namespace.substring(0, namespace.lastIndexOf('.')))) {\r\n      if (goog.getObjectByName(namespace)) {\r\n        break;\r\n      }\r\n      goog.implicitNamespaces_[namespace] = true;\r\n    }\r\n  }\r\n\r\n  goog.exportPath_(name, opt_obj);\r\n};\r\n\r\n\r\n/**\r\n * Returns CSP nonce, if set for any script tag.\r\n * @param {?Window=} opt_window The window context used to retrieve the nonce.\r\n *     Defaults to global context.\r\n * @return {string} CSP nonce or empty string if no nonce is present.\r\n */\r\ngoog.getScriptNonce = function(opt_window) {\r\n  if (opt_window && opt_window != goog.global) {\r\n    return goog.getScriptNonce_(opt_window.document);\r\n  }\r\n  if (goog.cspNonce_ === null) {\r\n    goog.cspNonce_ = goog.getScriptNonce_(goog.global.document);\r\n  }\r\n  return goog.cspNonce_;\r\n};\r\n\r\n\r\n/**\r\n * According to the CSP3 spec a nonce must be a valid base64 string.\r\n * @see https://www.w3.org/TR/CSP3/#grammardef-base64-value\r\n * @private @const\r\n */\r\ngoog.NONCE_PATTERN_ = /^[\\w+/_-]+[=]{0,2}$/;\r\n\r\n\r\n/**\r\n * @private {?string}\r\n */\r\ngoog.cspNonce_ = null;\r\n\r\n\r\n/**\r\n * Returns CSP nonce, if set for any script tag.\r\n * @param {!Document} doc\r\n * @return {string} CSP nonce or empty string if no nonce is present.\r\n * @private\r\n */\r\ngoog.getScriptNonce_ = function(doc) {\r\n  var script = doc.querySelector && doc.querySelector('script[nonce]');\r\n  if (script) {\r\n    // Try to get the nonce from the IDL property first, because browsers that\r\n    // implement additional nonce protection features (currently only Chrome) to\r\n    // prevent nonce stealing via CSS do not expose the nonce via attributes.\r\n    // See https://github.com/whatwg/html/issues/2369\r\n    var nonce = script['nonce'] || script.getAttribute('nonce');\r\n    if (nonce && goog.NONCE_PATTERN_.test(nonce)) {\r\n      return nonce;\r\n    }\r\n  }\r\n  return '';\r\n};\r\n\r\n\r\n/**\r\n * Module identifier validation regexp.\r\n * Note: This is a conservative check, it is very possible to be more lenient,\r\n *   the primary exclusion here is \"/\" and \"\\\" and a leading \".\", these\r\n *   restrictions are intended to leave the door open for using goog.require\r\n *   with relative file paths rather than module identifiers.\r\n * @private\r\n */\r\ngoog.VALID_MODULE_RE_ = /^[a-zA-Z_$][a-zA-Z0-9._$]*$/;\r\n\r\n\r\n/**\r\n * Defines a module in Closure.\r\n *\r\n * Marks that this file must be loaded as a module and claims the namespace.\r\n *\r\n * A namespace may only be defined once in a codebase. It may be defined using\r\n * goog.provide() or goog.module().\r\n *\r\n * goog.module() has three requirements:\r\n * - goog.module may not be used in the same file as goog.provide.\r\n * - goog.module must be the first statement in the file.\r\n * - only one goog.module is allowed per file.\r\n *\r\n * When a goog.module annotated file is loaded, it is enclosed in\r\n * a strict function closure. This means that:\r\n * - any variables declared in a goog.module file are private to the file\r\n * (not global), though the compiler is expected to inline the module.\r\n * - The code must obey all the rules of \"strict\" JavaScript.\r\n * - the file will be marked as \"use strict\"\r\n *\r\n * NOTE: unlike goog.provide, goog.module does not declare any symbols by\r\n * itself. If declared symbols are desired, use\r\n * goog.module.declareLegacyNamespace().\r\n *\r\n *\r\n * See the public goog.module proposal: http://goo.gl/Va1hin\r\n *\r\n * @param {string} name Namespace provided by this file in the form\r\n *     \"goog.package.part\", is expected but not required.\r\n * @return {void}\r\n */\r\ngoog.module = function(name) {\r\n  if (!goog.isString(name) || !name ||\r\n      name.search(goog.VALID_MODULE_RE_) == -1) {\r\n    throw new Error('Invalid module identifier');\r\n  }\r\n  if (!goog.isInGoogModuleLoader_()) {\r\n    throw new Error(\r\n        'Module ' + name + ' has been loaded incorrectly. Note, ' +\r\n        'modules cannot be loaded as normal scripts. They require some kind of ' +\r\n        'pre-processing step. You\\'re likely trying to load a module via a ' +\r\n        'script tag or as a part of a concatenated bundle without rewriting the ' +\r\n        'module. For more info see: ' +\r\n        'https://github.com/google/closure-library/wiki/goog.module:-an-ES6-module-like-alternative-to-goog.provide.');\r\n  }\r\n  if (goog.moduleLoaderState_.moduleName) {\r\n    throw new Error('goog.module may only be called once per module.');\r\n  }\r\n\r\n  // Store the module name for the loader.\r\n  goog.moduleLoaderState_.moduleName = name;\r\n  if (!COMPILED) {\r\n    // Ensure that the same namespace isn't provided twice.\r\n    // A goog.module/goog.provide maps a goog.require to a specific file\r\n    if (goog.isProvided_(name)) {\r\n      throw new Error('Namespace \"' + name + '\" already declared.');\r\n    }\r\n    delete goog.implicitNamespaces_[name];\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @param {string} name The module identifier.\r\n * @return {?} The module exports for an already loaded module or null.\r\n *\r\n * Note: This is not an alternative to goog.require, it does not\r\n * indicate a hard dependency, instead it is used to indicate\r\n * an optional dependency or to access the exports of a module\r\n * that has already been loaded.\r\n * @suppress {missingProvide}\r\n */\r\ngoog.module.get = function(name) {\r\n\r\n  return goog.module.getInternal_(name);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} name The module identifier.\r\n * @return {?} The module exports for an already loaded module or null.\r\n * @private\r\n */\r\ngoog.module.getInternal_ = function(name) {\r\n  if (!COMPILED) {\r\n    if (name in goog.loadedModules_) {\r\n      return goog.loadedModules_[name].exports;\r\n    } else if (!goog.implicitNamespaces_[name]) {\r\n      var ns = goog.getObjectByName(name);\r\n      return ns != null ? ns : null;\r\n    }\r\n  }\r\n  return null;\r\n};\r\n\r\n\r\n/**\r\n * Types of modules the debug loader can load.\r\n * @enum {string}\r\n */\r\ngoog.ModuleType = {\r\n  ES6: 'es6',\r\n  GOOG: 'goog'\r\n};\r\n\r\n\r\n/**\r\n * @private {?{\r\n *   moduleName: (string|undefined),\r\n *   declareLegacyNamespace:boolean,\r\n *   type: ?goog.ModuleType\r\n * }}\r\n */\r\ngoog.moduleLoaderState_ = null;\r\n\r\n\r\n/**\r\n * @private\r\n * @return {boolean} Whether a goog.module or an es6 module is currently being\r\n *     initialized.\r\n */\r\ngoog.isInModuleLoader_ = function() {\r\n  return goog.isInGoogModuleLoader_() || goog.isInEs6ModuleLoader_();\r\n};\r\n\r\n\r\n/**\r\n * @private\r\n * @return {boolean} Whether a goog.module is currently being initialized.\r\n */\r\ngoog.isInGoogModuleLoader_ = function() {\r\n  return !!goog.moduleLoaderState_ &&\r\n      goog.moduleLoaderState_.type == goog.ModuleType.GOOG;\r\n};\r\n\r\n\r\n/**\r\n * @private\r\n * @return {boolean} Whether an es6 module is currently being initialized.\r\n */\r\ngoog.isInEs6ModuleLoader_ = function() {\r\n  var inLoader = !!goog.moduleLoaderState_ &&\r\n      goog.moduleLoaderState_.type == goog.ModuleType.ES6;\r\n\r\n  if (inLoader) {\r\n    return true;\r\n  }\r\n\r\n  var jscomp = goog.global['$jscomp'];\r\n\r\n  if (jscomp) {\r\n    // jscomp may not have getCurrentModulePath if this is a compiled bundle\r\n    // that has some of the runtime, but not all of it. This can happen if\r\n    // optimizations are turned on so the unused runtime is removed but renaming\r\n    // and Closure pass are off (so $jscomp is still named $jscomp and the\r\n    // goog.provide/require calls still exist).\r\n    if (typeof jscomp.getCurrentModulePath != 'function') {\r\n      return false;\r\n    }\r\n\r\n    // Bundled ES6 module.\r\n    return !!jscomp.getCurrentModulePath();\r\n  }\r\n\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Provide the module's exports as a globally accessible object under the\r\n * module's declared name.  This is intended to ease migration to goog.module\r\n * for files that have existing usages.\r\n * @suppress {missingProvide}\r\n */\r\ngoog.module.declareLegacyNamespace = function() {\r\n  if (!COMPILED && !goog.isInGoogModuleLoader_()) {\r\n    throw new Error(\r\n        'goog.module.declareLegacyNamespace must be called from ' +\r\n        'within a goog.module');\r\n  }\r\n  if (!COMPILED && !goog.moduleLoaderState_.moduleName) {\r\n    throw new Error(\r\n        'goog.module must be called prior to ' +\r\n        'goog.module.declareLegacyNamespace.');\r\n  }\r\n  goog.moduleLoaderState_.declareLegacyNamespace = true;\r\n};\r\n\r\n\r\n/**\r\n * Associates an ES6 module with a Closure module ID so that is available via\r\n * goog.require. The associated ID  acts like a goog.module ID - it does not\r\n * create any global names, it is merely available via goog.require /\r\n * goog.module.get / goog.forwardDeclare / goog.requireType. goog.require and\r\n * goog.module.get will return the entire module as if it was import *'d. This\r\n * allows Closure files to reference ES6 modules for the sake of migration.\r\n *\r\n * @param {string} namespace\r\n * @suppress {missingProvide}\r\n */\r\ngoog.declareModuleId = function(namespace) {\r\n  if (!COMPILED) {\r\n    if (!goog.isInEs6ModuleLoader_()) {\r\n      throw new Error(\r\n          'goog.declareModuleId may only be called from ' +\r\n          'within an ES6 module');\r\n    }\r\n    if (goog.moduleLoaderState_ && goog.moduleLoaderState_.moduleName) {\r\n      throw new Error(\r\n          'goog.declareModuleId may only be called once per module.');\r\n    }\r\n    if (namespace in goog.loadedModules_) {\r\n      throw new Error(\r\n          'Module with namespace \"' + namespace + '\" already exists.');\r\n    }\r\n  }\r\n  if (goog.moduleLoaderState_) {\r\n    // Not bundled - debug loading.\r\n    goog.moduleLoaderState_.moduleName = namespace;\r\n  } else {\r\n    // Bundled - not debug loading, no module loader state.\r\n    var jscomp = goog.global['$jscomp'];\r\n    if (!jscomp || typeof jscomp.getCurrentModulePath != 'function') {\r\n      throw new Error(\r\n          'Module with namespace \"' + namespace +\r\n          '\" has been loaded incorrectly.');\r\n    }\r\n    var exports = jscomp.require(jscomp.getCurrentModulePath());\r\n    goog.loadedModules_[namespace] = {\r\n      exports: exports,\r\n      type: goog.ModuleType.ES6,\r\n      moduleId: namespace\r\n    };\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Marks that the current file should only be used for testing, and never for\r\n * live code in production.\r\n *\r\n * In the case of unit tests, the message may optionally be an exact namespace\r\n * for the test (e.g. 'goog.stringTest'). The linter will then ignore the extra\r\n * provide (if not explicitly defined in the code).\r\n *\r\n * @param {string=} opt_message Optional message to add to the error that's\r\n *     raised when used in production code.\r\n */\r\ngoog.setTestOnly = function(opt_message) {\r\n  if (goog.DISALLOW_TEST_ONLY_CODE) {\r\n    opt_message = opt_message || '';\r\n    throw new Error(\r\n        'Importing test-only code into non-debug environment' +\r\n        (opt_message ? ': ' + opt_message : '.'));\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Forward declares a symbol. This is an indication to the compiler that the\r\n * symbol may be used in the source yet is not required and may not be provided\r\n * in compilation.\r\n *\r\n * The most common usage of forward declaration is code that takes a type as a\r\n * function parameter but does not need to require it. By forward declaring\r\n * instead of requiring, no hard dependency is made, and (if not required\r\n * elsewhere) the namespace may never be required and thus, not be pulled\r\n * into the JavaScript binary. If it is required elsewhere, it will be type\r\n * checked as normal.\r\n *\r\n * Before using goog.forwardDeclare, please read the documentation at\r\n * https://github.com/google/closure-compiler/wiki/Bad-Type-Annotation to\r\n * understand the options and tradeoffs when working with forward declarations.\r\n *\r\n * @param {string} name The namespace to forward declare in the form of\r\n *     \"goog.package.part\".\r\n */\r\ngoog.forwardDeclare = function(name) {};\r\n\r\n\r\n/**\r\n * Forward declare type information. Used to assign types to goog.global\r\n * referenced object that would otherwise result in unknown type references\r\n * and thus block property disambiguation.\r\n */\r\ngoog.forwardDeclare('Document');\r\ngoog.forwardDeclare('HTMLScriptElement');\r\ngoog.forwardDeclare('XMLHttpRequest');\r\n\r\n\r\nif (!COMPILED) {\r\n  /**\r\n   * Check if the given name has been goog.provided. This will return false for\r\n   * names that are available only as implicit namespaces.\r\n   * @param {string} name name of the object to look for.\r\n   * @return {boolean} Whether the name has been provided.\r\n   * @private\r\n   */\r\n  goog.isProvided_ = function(name) {\r\n    return (name in goog.loadedModules_) ||\r\n        (!goog.implicitNamespaces_[name] &&\r\n         goog.isDefAndNotNull(goog.getObjectByName(name)));\r\n  };\r\n\r\n  /**\r\n   * Namespaces implicitly defined by goog.provide. For example,\r\n   * goog.provide('goog.events.Event') implicitly declares that 'goog' and\r\n   * 'goog.events' must be namespaces.\r\n   *\r\n   * @type {!Object<string, (boolean|undefined)>}\r\n   * @private\r\n   */\r\n  goog.implicitNamespaces_ = {'goog.module': true};\r\n\r\n  // NOTE: We add goog.module as an implicit namespace as goog.module is defined\r\n  // here and because the existing module package has not been moved yet out of\r\n  // the goog.module namespace. This satisifies both the debug loader and\r\n  // ahead-of-time dependency management.\r\n}\r\n\r\n\r\n/**\r\n * Returns an object based on its fully qualified external name.  The object\r\n * is not found if null or undefined.  If you are using a compilation pass that\r\n * renames property names beware that using this function will not find renamed\r\n * properties.\r\n *\r\n * @param {string} name The fully qualified name.\r\n * @param {Object=} opt_obj The object within which to look; default is\r\n *     |goog.global|.\r\n * @return {?} The value (object or primitive) or, if not found, null.\r\n */\r\ngoog.getObjectByName = function(name, opt_obj) {\r\n  var parts = name.split('.');\r\n  var cur = opt_obj || goog.global;\r\n  for (var i = 0; i < parts.length; i++) {\r\n    cur = cur[parts[i]];\r\n    if (!goog.isDefAndNotNull(cur)) {\r\n      return null;\r\n    }\r\n  }\r\n  return cur;\r\n};\r\n\r\n\r\n/**\r\n * Globalizes a whole namespace, such as goog or goog.lang.\r\n *\r\n * @param {!Object} obj The namespace to globalize.\r\n * @param {Object=} opt_global The object to add the properties to.\r\n * @deprecated Properties may be explicitly exported to the global scope, but\r\n *     this should no longer be done in bulk.\r\n */\r\ngoog.globalize = function(obj, opt_global) {\r\n  var global = opt_global || goog.global;\r\n  for (var x in obj) {\r\n    global[x] = obj[x];\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Adds a dependency from a file to the files it requires.\r\n * @param {string} relPath The path to the js file.\r\n * @param {!Array<string>} provides An array of strings with\r\n *     the names of the objects this file provides.\r\n * @param {!Array<string>} requires An array of strings with\r\n *     the names of the objects this file requires.\r\n * @param {boolean|!Object<string>=} opt_loadFlags Parameters indicating\r\n *     how the file must be loaded.  The boolean 'true' is equivalent\r\n *     to {'module': 'goog'} for backwards-compatibility.  Valid properties\r\n *     and values include {'module': 'goog'} and {'lang': 'es6'}.\r\n */\r\ngoog.addDependency = function(relPath, provides, requires, opt_loadFlags) {\r\n  if (!COMPILED && goog.DEPENDENCIES_ENABLED) {\r\n    goog.debugLoader_.addDependency(relPath, provides, requires, opt_loadFlags);\r\n  }\r\n};\r\n\r\n\r\n\r\n\r\n// NOTE(nnaze): The debug DOM loader was included in base.js as an original way\r\n// to do \"debug-mode\" development.  The dependency system can sometimes be\r\n// confusing, as can the debug DOM loader's asynchronous nature.\r\n//\r\n// With the DOM loader, a call to goog.require() is not blocking -- the script\r\n// will not load until some point after the current script.  If a namespace is\r\n// needed at runtime, it needs to be defined in a previous script, or loaded via\r\n// require() with its registered dependencies.\r\n//\r\n// User-defined namespaces may need their own deps file. For a reference on\r\n// creating a deps file, see:\r\n// Externally: https://developers.google.com/closure/library/docs/depswriter\r\n//\r\n// Because of legacy clients, the DOM loader can't be easily removed from\r\n// base.js.  Work was done to make it disableable or replaceable for\r\n// different environments (DOM-less JavaScript interpreters like Rhino or V8,\r\n// for example). See bootstrap/ for more information.\r\n\r\n\r\n/**\r\n * @define {boolean} Whether to enable the debug loader.\r\n *\r\n * If enabled, a call to goog.require() will attempt to load the namespace by\r\n * appending a script tag to the DOM (if the namespace has been registered).\r\n *\r\n * If disabled, goog.require() will simply assert that the namespace has been\r\n * provided (and depend on the fact that some outside tool correctly ordered\r\n * the script).\r\n */\r\ngoog.ENABLE_DEBUG_LOADER = goog.define('goog.ENABLE_DEBUG_LOADER', true);\r\n\r\n\r\n/**\r\n * @param {string} msg\r\n * @private\r\n */\r\ngoog.logToConsole_ = function(msg) {\r\n  if (goog.global.console) {\r\n    goog.global.console['error'](msg);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Implements a system for the dynamic resolution of dependencies that works in\r\n * parallel with the BUILD system.\r\n *\r\n * Note that all calls to goog.require will be stripped by the compiler.\r\n *\r\n * @see goog.provide\r\n * @param {string} namespace Namespace (as was given in goog.provide,\r\n *     goog.module, or goog.declareModuleId) in the form\r\n *     \"goog.package.part\".\r\n * @return {?} If called within a goog.module or ES6 module file, the associated\r\n *     namespace or module otherwise null.\r\n */\r\ngoog.require = function(namespace) {\r\n  if (!COMPILED) {\r\n    // Might need to lazy load on old IE.\r\n    if (goog.ENABLE_DEBUG_LOADER) {\r\n      goog.debugLoader_.requested(namespace);\r\n    }\r\n\r\n    // If the object already exists we do not need to do anything.\r\n    if (goog.isProvided_(namespace)) {\r\n      if (goog.isInModuleLoader_()) {\r\n        return goog.module.getInternal_(namespace);\r\n      }\r\n    } else if (goog.ENABLE_DEBUG_LOADER) {\r\n      var moduleLoaderState = goog.moduleLoaderState_;\r\n      goog.moduleLoaderState_ = null;\r\n      try {\r\n        goog.debugLoader_.load_(namespace);\r\n      } finally {\r\n        goog.moduleLoaderState_ = moduleLoaderState;\r\n      }\r\n    }\r\n\r\n    return null;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Requires a symbol for its type information. This is an indication to the\r\n * compiler that the symbol may appear in type annotations, yet it is not\r\n * referenced at runtime.\r\n *\r\n * When called within a goog.module or ES6 module file, the return value may be\r\n * assigned to or destructured into a variable, but it may not be otherwise used\r\n * in code outside of a type annotation.\r\n *\r\n * Note that all calls to goog.requireType will be stripped by the compiler.\r\n *\r\n * @param {string} namespace Namespace (as was given in goog.provide,\r\n *     goog.module, or goog.declareModuleId) in the form\r\n *     \"goog.package.part\".\r\n * @return {?}\r\n */\r\ngoog.requireType = function(namespace) {\r\n  // Return an empty object so that single-level destructuring of the return\r\n  // value doesn't crash at runtime when using the debug loader. Multi-level\r\n  // destructuring isn't supported.\r\n  return {};\r\n};\r\n\r\n\r\n/**\r\n * Path for included scripts.\r\n * @type {string}\r\n */\r\ngoog.basePath = '';\r\n\r\n\r\n/**\r\n * A hook for overriding the base path.\r\n * @type {string|undefined}\r\n */\r\ngoog.global.CLOSURE_BASE_PATH;\r\n\r\n\r\n/**\r\n * Whether to attempt to load Closure's deps file. By default, when uncompiled,\r\n * deps files will attempt to be loaded.\r\n * @type {boolean|undefined}\r\n */\r\ngoog.global.CLOSURE_NO_DEPS;\r\n\r\n\r\n/**\r\n * A function to import a single script. This is meant to be overridden when\r\n * Closure is being run in non-HTML contexts, such as web workers. It's defined\r\n * in the global scope so that it can be set before base.js is loaded, which\r\n * allows deps.js to be imported properly.\r\n *\r\n * The first parameter the script source, which is a relative URI. The second,\r\n * optional parameter is the script contents, in the event the script needed\r\n * transformation. It should return true if the script was imported, false\r\n * otherwise.\r\n * @type {(function(string, string=): boolean)|undefined}\r\n */\r\ngoog.global.CLOSURE_IMPORT_SCRIPT;\r\n\r\n\r\n/**\r\n * Null function used for default values of callbacks, etc.\r\n * @return {void} Nothing.\r\n */\r\ngoog.nullFunction = function() {};\r\n\r\n\r\n/**\r\n * When defining a class Foo with an abstract method bar(), you can do:\r\n * Foo.prototype.bar = goog.abstractMethod\r\n *\r\n * Now if a subclass of Foo fails to override bar(), an error will be thrown\r\n * when bar() is invoked.\r\n *\r\n * @type {!Function}\r\n * @throws {Error} when invoked to indicate the method should be overridden.\r\n */\r\ngoog.abstractMethod = function() {\r\n  throw new Error('unimplemented abstract method');\r\n};\r\n\r\n\r\n/**\r\n * Adds a `getInstance` static method that always returns the same\r\n * instance object.\r\n * @param {!Function} ctor The constructor for the class to add the static\r\n *     method to.\r\n * @suppress {missingProperties} 'instance_' isn't a property on 'Function'\r\n *     but we don't have a better type to use here.\r\n */\r\ngoog.addSingletonGetter = function(ctor) {\r\n  // instance_ is immediately set to prevent issues with sealed constructors\r\n  // such as are encountered when a constructor is returned as the export object\r\n  // of a goog.module in unoptimized code.\r\n  // Delcare type to avoid conformance violations that ctor.instance_ is unknown\r\n  /** @type {undefined|!Object} @suppress {underscore} */\r\n  ctor.instance_ = undefined;\r\n  ctor.getInstance = function() {\r\n    if (ctor.instance_) {\r\n      return ctor.instance_;\r\n    }\r\n    if (goog.DEBUG) {\r\n      // NOTE: JSCompiler can't optimize away Array#push.\r\n      goog.instantiatedSingletons_[goog.instantiatedSingletons_.length] = ctor;\r\n    }\r\n    // Cast to avoid conformance violations that ctor.instance_ is unknown\r\n    return /** @type {!Object|undefined} */ (ctor.instance_) = new ctor;\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * All singleton classes that have been instantiated, for testing. Don't read\r\n * it directly, use the `goog.testing.singleton` module. The compiler\r\n * removes this variable if unused.\r\n * @type {!Array<!Function>}\r\n * @private\r\n */\r\ngoog.instantiatedSingletons_ = [];\r\n\r\n\r\n/**\r\n * @define {boolean} Whether to load goog.modules using `eval` when using\r\n * the debug loader.  This provides a better debugging experience as the\r\n * source is unmodified and can be edited using Chrome Workspaces or similar.\r\n * However in some environments the use of `eval` is banned\r\n * so we provide an alternative.\r\n */\r\ngoog.LOAD_MODULE_USING_EVAL = goog.define('goog.LOAD_MODULE_USING_EVAL', true);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the exports of goog.modules should be sealed when\r\n * possible.\r\n */\r\ngoog.SEAL_MODULE_EXPORTS = goog.define('goog.SEAL_MODULE_EXPORTS', goog.DEBUG);\r\n\r\n\r\n/**\r\n * The registry of initialized modules:\r\n * The module identifier or path to module exports map.\r\n * @private @const {!Object<string, {exports:?,type:string,moduleId:string}>}\r\n */\r\ngoog.loadedModules_ = {};\r\n\r\n\r\n/**\r\n * True if the debug loader enabled and used.\r\n * @const {boolean}\r\n */\r\ngoog.DEPENDENCIES_ENABLED = !COMPILED && goog.ENABLE_DEBUG_LOADER;\r\n\r\n\r\n/**\r\n * @define {string} How to decide whether to transpile.  Valid values\r\n * are 'always', 'never', and 'detect'.  The default ('detect') is to\r\n * use feature detection to determine which language levels need\r\n * transpilation.\r\n */\r\n// NOTE(sdh): we could expand this to accept a language level to bypass\r\n// detection: e.g. goog.TRANSPILE == 'es5' would transpile ES6 files but\r\n// would leave ES3 and ES5 files alone.\r\ngoog.TRANSPILE = goog.define('goog.TRANSPILE', 'detect');\r\n\r\n/**\r\n * @define {boolean} If true assume that ES modules have already been\r\n * transpiled by the jscompiler (in the same way that transpile.js would\r\n * transpile them - to jscomp modules). Useful only for servers that wish to use\r\n * the debug loader and transpile server side. Thus this is only respected if\r\n * goog.TRANSPILE is \"never\".\r\n */\r\ngoog.ASSUME_ES_MODULES_TRANSPILED =\r\n    goog.define('goog.ASSUME_ES_MODULES_TRANSPILED', false);\r\n\r\n\r\n/**\r\n * @define {string} If a file needs to be transpiled what the output language\r\n * should be. By default this is the highest language level this file detects\r\n * the current environment supports. Generally this flag should not be set, but\r\n * it could be useful to override. Example: If the current environment supports\r\n * ES6 then by default ES7+ files will be transpiled to ES6, unless this is\r\n * overridden.\r\n *\r\n * Valid values include: es3, es5, es6, es7, and es8. Anything not recognized\r\n * is treated as es3.\r\n *\r\n * Note that setting this value does not force transpilation. Just if\r\n * transpilation occurs this will be the output. So this is most useful when\r\n * goog.TRANSPILE is set to 'always' and then forcing the language level to be\r\n * something lower than what the environment detects.\r\n */\r\ngoog.TRANSPILE_TO_LANGUAGE = goog.define('goog.TRANSPILE_TO_LANGUAGE', '');\r\n\r\n\r\n/**\r\n * @define {string} Path to the transpiler.  Executing the script at this\r\n * path (relative to base.js) should define a function $jscomp.transpile.\r\n */\r\ngoog.TRANSPILER = goog.define('goog.TRANSPILER', 'transpile.js');\r\n\r\n\r\n/**\r\n * @package {?boolean}\r\n * Visible for testing.\r\n */\r\ngoog.hasBadLetScoping = null;\r\n\r\n\r\n/**\r\n * @return {boolean}\r\n * @package Visible for testing.\r\n */\r\ngoog.useSafari10Workaround = function() {\r\n  if (goog.hasBadLetScoping == null) {\r\n    var hasBadLetScoping;\r\n    try {\r\n      hasBadLetScoping = !eval(\r\n          '\"use strict\";' +\r\n          'let x = 1; function f() { return typeof x; };' +\r\n          'f() == \"number\";');\r\n    } catch (e) {\r\n      // Assume that ES6 syntax isn't supported.\r\n      hasBadLetScoping = false;\r\n    }\r\n    goog.hasBadLetScoping = hasBadLetScoping;\r\n  }\r\n  return goog.hasBadLetScoping;\r\n};\r\n\r\n\r\n/**\r\n * @param {string} moduleDef\r\n * @return {string}\r\n * @package Visible for testing.\r\n */\r\ngoog.workaroundSafari10EvalBug = function(moduleDef) {\r\n  return '(function(){' + moduleDef +\r\n      '\\n' +  // Terminate any trailing single line comment.\r\n      ';' +   // Terminate any trailing expression.\r\n      '})();\\n';\r\n};\r\n\r\n\r\n/**\r\n * @param {function(?):?|string} moduleDef The module definition.\r\n */\r\ngoog.loadModule = function(moduleDef) {\r\n  // NOTE: we allow function definitions to be either in the from\r\n  // of a string to eval (which keeps the original source intact) or\r\n  // in a eval forbidden environment (CSP) we allow a function definition\r\n  // which in its body must call `goog.module`, and return the exports\r\n  // of the module.\r\n  var previousState = goog.moduleLoaderState_;\r\n  try {\r\n    goog.moduleLoaderState_ = {\r\n      moduleName: '',\r\n      declareLegacyNamespace: false,\r\n      type: goog.ModuleType.GOOG\r\n    };\r\n    var exports;\r\n    if (goog.isFunction(moduleDef)) {\r\n      exports = moduleDef.call(undefined, {});\r\n    } else if (goog.isString(moduleDef)) {\r\n      if (goog.useSafari10Workaround()) {\r\n        moduleDef = goog.workaroundSafari10EvalBug(moduleDef);\r\n      }\r\n\r\n      exports = goog.loadModuleFromSource_.call(undefined, moduleDef);\r\n    } else {\r\n      throw new Error('Invalid module definition');\r\n    }\r\n\r\n    var moduleName = goog.moduleLoaderState_.moduleName;\r\n    if (goog.isString(moduleName) && moduleName) {\r\n      // Don't seal legacy namespaces as they may be used as a parent of\r\n      // another namespace\r\n      if (goog.moduleLoaderState_.declareLegacyNamespace) {\r\n        goog.constructNamespace_(moduleName, exports);\r\n      } else if (\r\n          goog.SEAL_MODULE_EXPORTS && Object.seal &&\r\n          typeof exports == 'object' && exports != null) {\r\n        Object.seal(exports);\r\n      }\r\n\r\n      var data = {\r\n        exports: exports,\r\n        type: goog.ModuleType.GOOG,\r\n        moduleId: goog.moduleLoaderState_.moduleName\r\n      };\r\n      goog.loadedModules_[moduleName] = data;\r\n    } else {\r\n      throw new Error('Invalid module name \\\"' + moduleName + '\\\"');\r\n    }\r\n  } finally {\r\n    goog.moduleLoaderState_ = previousState;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @private @const\r\n */\r\ngoog.loadModuleFromSource_ = /** @type {function(string):?} */ (function() {\r\n  // NOTE: we avoid declaring parameters or local variables here to avoid\r\n  // masking globals or leaking values into the module definition.\r\n  'use strict';\r\n  var exports = {};\r\n  eval(arguments[0]);\r\n  return exports;\r\n});\r\n\r\n\r\n/**\r\n * Normalize a file path by removing redundant \"..\" and extraneous \".\" file\r\n * path components.\r\n * @param {string} path\r\n * @return {string}\r\n * @private\r\n */\r\ngoog.normalizePath_ = function(path) {\r\n  var components = path.split('/');\r\n  var i = 0;\r\n  while (i < components.length) {\r\n    if (components[i] == '.') {\r\n      components.splice(i, 1);\r\n    } else if (\r\n        i && components[i] == '..' && components[i - 1] &&\r\n        components[i - 1] != '..') {\r\n      components.splice(--i, 2);\r\n    } else {\r\n      i++;\r\n    }\r\n  }\r\n  return components.join('/');\r\n};\r\n\r\n\r\n/**\r\n * Provides a hook for loading a file when using Closure's goog.require() API\r\n * with goog.modules.  In particular this hook is provided to support Node.js.\r\n *\r\n * @type {(function(string):string)|undefined}\r\n */\r\ngoog.global.CLOSURE_LOAD_FILE_SYNC;\r\n\r\n\r\n/**\r\n * Loads file by synchronous XHR. Should not be used in production environments.\r\n * @param {string} src Source URL.\r\n * @return {?string} File contents, or null if load failed.\r\n * @private\r\n */\r\ngoog.loadFileSync_ = function(src) {\r\n  if (goog.global.CLOSURE_LOAD_FILE_SYNC) {\r\n    return goog.global.CLOSURE_LOAD_FILE_SYNC(src);\r\n  } else {\r\n    try {\r\n      /** @type {XMLHttpRequest} */\r\n      var xhr = new goog.global['XMLHttpRequest']();\r\n      xhr.open('get', src, false);\r\n      xhr.send();\r\n      // NOTE: Successful http: requests have a status of 200, but successful\r\n      // file: requests may have a status of zero.  Any other status, or a\r\n      // thrown exception (particularly in case of file: requests) indicates\r\n      // some sort of error, which we treat as a missing or unavailable file.\r\n      return xhr.status == 0 || xhr.status == 200 ? xhr.responseText : null;\r\n    } catch (err) {\r\n      // No need to rethrow or log, since errors should show up on their own.\r\n      return null;\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Lazily retrieves the transpiler and applies it to the source.\r\n * @param {string} code JS code.\r\n * @param {string} path Path to the code.\r\n * @param {string} target Language level output.\r\n * @return {string} The transpiled code.\r\n * @private\r\n */\r\ngoog.transpile_ = function(code, path, target) {\r\n  var jscomp = goog.global['$jscomp'];\r\n  if (!jscomp) {\r\n    goog.global['$jscomp'] = jscomp = {};\r\n  }\r\n  var transpile = jscomp.transpile;\r\n  if (!transpile) {\r\n    var transpilerPath = goog.basePath + goog.TRANSPILER;\r\n    var transpilerCode = goog.loadFileSync_(transpilerPath);\r\n    if (transpilerCode) {\r\n      // This must be executed synchronously, since by the time we know we\r\n      // need it, we're about to load and write the ES6 code synchronously,\r\n      // so a normal script-tag load will be too slow. Wrapped in a function\r\n      // so that code is eval'd in the global scope.\r\n      (function() {\r\n        eval(transpilerCode + '\\n//# sourceURL=' + transpilerPath);\r\n      }).call(goog.global);\r\n      // Even though the transpiler is optional, if $gwtExport is found, it's\r\n      // a sign the transpiler was loaded and the $jscomp.transpile *should*\r\n      // be there.\r\n      if (goog.global['$gwtExport'] && goog.global['$gwtExport']['$jscomp'] &&\r\n          !goog.global['$gwtExport']['$jscomp']['transpile']) {\r\n        throw new Error(\r\n            'The transpiler did not properly export the \"transpile\" ' +\r\n            'method. $gwtExport: ' + JSON.stringify(goog.global['$gwtExport']));\r\n      }\r\n      // transpile.js only exports a single $jscomp function, transpile. We\r\n      // grab just that and add it to the existing definition of $jscomp which\r\n      // contains the polyfills.\r\n      goog.global['$jscomp'].transpile =\r\n          goog.global['$gwtExport']['$jscomp']['transpile'];\r\n      jscomp = goog.global['$jscomp'];\r\n      transpile = jscomp.transpile;\r\n    }\r\n  }\r\n  if (!transpile) {\r\n    // The transpiler is an optional component.  If it's not available then\r\n    // replace it with a pass-through function that simply logs.\r\n    var suffix = ' requires transpilation but no transpiler was found.';\r\n    transpile = jscomp.transpile = function(code, path) {\r\n      // TODO(sdh): figure out some way to get this error to show up\r\n      // in test results, noting that the failure may occur in many\r\n      // different ways, including in loadModule() before the test\r\n      // runner even comes up.\r\n      goog.logToConsole_(path + suffix);\r\n      return code;\r\n    };\r\n  }\r\n  // Note: any transpilation errors/warnings will be logged to the console.\r\n  return transpile(code, path, target);\r\n};\r\n\r\n//==============================================================================\r\n// Language Enhancements\r\n//==============================================================================\r\n\r\n\r\n/**\r\n * This is a \"fixed\" version of the typeof operator.  It differs from the typeof\r\n * operator in such a way that null returns 'null' and arrays return 'array'.\r\n * @param {?} value The value to get the type of.\r\n * @return {string} The name of the type.\r\n */\r\ngoog.typeOf = function(value) {\r\n  var s = typeof value;\r\n  if (s == 'object') {\r\n    if (value) {\r\n      // Check these first, so we can avoid calling Object.prototype.toString if\r\n      // possible.\r\n      //\r\n      // IE improperly marshals typeof across execution contexts, but a\r\n      // cross-context object will still return false for \"instanceof Object\".\r\n      if (value instanceof Array) {\r\n        return 'array';\r\n      } else if (value instanceof Object) {\r\n        return s;\r\n      }\r\n\r\n      // HACK: In order to use an Object prototype method on the arbitrary\r\n      //   value, the compiler requires the value be cast to type Object,\r\n      //   even though the ECMA spec explicitly allows it.\r\n      var className = Object.prototype.toString.call(\r\n          /** @type {!Object} */ (value));\r\n      // In Firefox 3.6, attempting to access iframe window objects' length\r\n      // property throws an NS_ERROR_FAILURE, so we need to special-case it\r\n      // here.\r\n      if (className == '[object Window]') {\r\n        return 'object';\r\n      }\r\n\r\n      // We cannot always use constructor == Array or instanceof Array because\r\n      // different frames have different Array objects. In IE6, if the iframe\r\n      // where the array was created is destroyed, the array loses its\r\n      // prototype. Then dereferencing val.splice here throws an exception, so\r\n      // we can't use goog.isFunction. Calling typeof directly returns 'unknown'\r\n      // so that will work. In this case, this function will return false and\r\n      // most array functions will still work because the array is still\r\n      // array-like (supports length and []) even though it has lost its\r\n      // prototype.\r\n      // Mark Miller noticed that Object.prototype.toString\r\n      // allows access to the unforgeable [[Class]] property.\r\n      //  15.2.4.2 Object.prototype.toString ( )\r\n      //  When the toString method is called, the following steps are taken:\r\n      //      1. Get the [[Class]] property of this object.\r\n      //      2. Compute a string value by concatenating the three strings\r\n      //         \"[object \", Result(1), and \"]\".\r\n      //      3. Return Result(2).\r\n      // and this behavior survives the destruction of the execution context.\r\n      if ((className == '[object Array]' ||\r\n           // In IE all non value types are wrapped as objects across window\r\n           // boundaries (not iframe though) so we have to do object detection\r\n           // for this edge case.\r\n           typeof value.length == 'number' &&\r\n               typeof value.splice != 'undefined' &&\r\n               typeof value.propertyIsEnumerable != 'undefined' &&\r\n               !value.propertyIsEnumerable('splice')\r\n\r\n               )) {\r\n        return 'array';\r\n      }\r\n      // HACK: There is still an array case that fails.\r\n      //     function ArrayImpostor() {}\r\n      //     ArrayImpostor.prototype = [];\r\n      //     var impostor = new ArrayImpostor;\r\n      // this can be fixed by getting rid of the fast path\r\n      // (value instanceof Array) and solely relying on\r\n      // (value && Object.prototype.toString.vall(value) === '[object Array]')\r\n      // but that would require many more function calls and is not warranted\r\n      // unless closure code is receiving objects from untrusted sources.\r\n\r\n      // IE in cross-window calls does not correctly marshal the function type\r\n      // (it appears just as an object) so we cannot use just typeof val ==\r\n      // 'function'. However, if the object has a call property, it is a\r\n      // function.\r\n      if ((className == '[object Function]' ||\r\n           typeof value.call != 'undefined' &&\r\n               typeof value.propertyIsEnumerable != 'undefined' &&\r\n               !value.propertyIsEnumerable('call'))) {\r\n        return 'function';\r\n      }\r\n\r\n    } else {\r\n      return 'null';\r\n    }\r\n\r\n  } else if (s == 'function' && typeof value.call == 'undefined') {\r\n    // In Safari typeof nodeList returns 'function', and on Firefox typeof\r\n    // behaves similarly for HTML{Applet,Embed,Object}, Elements and RegExps. We\r\n    // would like to return object for those and we can detect an invalid\r\n    // function by making sure that the function object has a call method.\r\n    return 'object';\r\n  }\r\n  return s;\r\n};\r\n\r\n\r\n/**\r\n * Returns true if the specified value is null.\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is null.\r\n */\r\ngoog.isNull = function(val) {\r\n  return val === null;\r\n};\r\n\r\n\r\n/**\r\n * Returns true if the specified value is defined and not null.\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is defined and not null.\r\n */\r\ngoog.isDefAndNotNull = function(val) {\r\n  // Note that undefined == null.\r\n  return val != null;\r\n};\r\n\r\n\r\n/**\r\n * Returns true if the specified value is an array.\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is an array.\r\n */\r\ngoog.isArray = function(val) {\r\n  return goog.typeOf(val) == 'array';\r\n};\r\n\r\n\r\n/**\r\n * Returns true if the object looks like an array. To qualify as array like\r\n * the value needs to be either a NodeList or an object with a Number length\r\n * property. Note that for this function neither strings nor functions are\r\n * considered \"array-like\".\r\n *\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is an array.\r\n */\r\ngoog.isArrayLike = function(val) {\r\n  var type = goog.typeOf(val);\r\n  // We do not use goog.isObject here in order to exclude function values.\r\n  return type == 'array' || type == 'object' && typeof val.length == 'number';\r\n};\r\n\r\n\r\n/**\r\n * Returns true if the object looks like a Date. To qualify as Date-like the\r\n * value needs to be an object and have a getFullYear() function.\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is a like a Date.\r\n */\r\ngoog.isDateLike = function(val) {\r\n  return goog.isObject(val) && typeof val.getFullYear == 'function';\r\n};\r\n\r\n\r\n/**\r\n * Returns true if the specified value is a function.\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is a function.\r\n */\r\ngoog.isFunction = function(val) {\r\n  return goog.typeOf(val) == 'function';\r\n};\r\n\r\n\r\n/**\r\n * Returns true if the specified value is an object.  This includes arrays and\r\n * functions.\r\n * @param {?} val Variable to test.\r\n * @return {boolean} Whether variable is an object.\r\n */\r\ngoog.isObject = function(val) {\r\n  var type = typeof val;\r\n  return type == 'object' && val != null || type == 'function';\r\n  // return Object(val) === val also works, but is slower, especially if val is\r\n  // not an object.\r\n};\r\n\r\n\r\n/**\r\n * Gets a unique ID for an object. This mutates the object so that further calls\r\n * with the same object as a parameter returns the same value. The unique ID is\r\n * guaranteed to be unique across the current session amongst objects that are\r\n * passed into `getUid`. There is no guarantee that the ID is unique or\r\n * consistent across sessions. It is unsafe to generate unique ID for function\r\n * prototypes.\r\n *\r\n * @param {Object} obj The object to get the unique ID for.\r\n * @return {number} The unique ID for the object.\r\n */\r\ngoog.getUid = function(obj) {\r\n  // TODO(arv): Make the type stricter, do not accept null.\r\n\r\n  // In Opera window.hasOwnProperty exists but always returns false so we avoid\r\n  // using it. As a consequence the unique ID generated for BaseClass.prototype\r\n  // and SubClass.prototype will be the same.\r\n  return obj[goog.UID_PROPERTY_] ||\r\n      (obj[goog.UID_PROPERTY_] = ++goog.uidCounter_);\r\n};\r\n\r\n\r\n/**\r\n * Whether the given object is already assigned a unique ID.\r\n *\r\n * This does not modify the object.\r\n *\r\n * @param {!Object} obj The object to check.\r\n * @return {boolean} Whether there is an assigned unique id for the object.\r\n */\r\ngoog.hasUid = function(obj) {\r\n  return !!obj[goog.UID_PROPERTY_];\r\n};\r\n\r\n\r\n/**\r\n * Removes the unique ID from an object. This is useful if the object was\r\n * previously mutated using `goog.getUid` in which case the mutation is\r\n * undone.\r\n * @param {Object} obj The object to remove the unique ID field from.\r\n */\r\ngoog.removeUid = function(obj) {\r\n  // TODO(arv): Make the type stricter, do not accept null.\r\n\r\n  // In IE, DOM nodes are not instances of Object and throw an exception if we\r\n  // try to delete.  Instead we try to use removeAttribute.\r\n  if (obj !== null && 'removeAttribute' in obj) {\r\n    obj.removeAttribute(goog.UID_PROPERTY_);\r\n  }\r\n\r\n  try {\r\n    delete obj[goog.UID_PROPERTY_];\r\n  } catch (ex) {\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Name for unique ID property. Initialized in a way to help avoid collisions\r\n * with other closure JavaScript on the same page.\r\n * @type {string}\r\n * @private\r\n */\r\ngoog.UID_PROPERTY_ = 'closure_uid_' + ((Math.random() * 1e9) >>> 0);\r\n\r\n\r\n/**\r\n * Counter for UID.\r\n * @type {number}\r\n * @private\r\n */\r\ngoog.uidCounter_ = 0;\r\n\r\n\r\n/**\r\n * Adds a hash code field to an object. The hash code is unique for the\r\n * given object.\r\n * @param {Object} obj The object to get the hash code for.\r\n * @return {number} The hash code for the object.\r\n * @deprecated Use goog.getUid instead.\r\n */\r\ngoog.getHashCode = goog.getUid;\r\n\r\n\r\n/**\r\n * Removes the hash code field from an object.\r\n * @param {Object} obj The object to remove the field from.\r\n * @deprecated Use goog.removeUid instead.\r\n */\r\ngoog.removeHashCode = goog.removeUid;\r\n\r\n\r\n/**\r\n * Clones a value. The input may be an Object, Array, or basic type. Objects and\r\n * arrays will be cloned recursively.\r\n *\r\n * WARNINGS:\r\n * <code>goog.cloneObject</code> does not detect reference loops. Objects that\r\n * refer to themselves will cause infinite recursion.\r\n *\r\n * <code>goog.cloneObject</code> is unaware of unique identifiers, and copies\r\n * UIDs created by <code>getUid</code> into cloned results.\r\n *\r\n * @param {*} obj The value to clone.\r\n * @return {*} A clone of the input value.\r\n * @deprecated goog.cloneObject is unsafe. Prefer the goog.object methods.\r\n */\r\ngoog.cloneObject = function(obj) {\r\n  var type = goog.typeOf(obj);\r\n  if (type == 'object' || type == 'array') {\r\n    if (typeof obj.clone === 'function') {\r\n      return obj.clone();\r\n    }\r\n    var clone = type == 'array' ? [] : {};\r\n    for (var key in obj) {\r\n      clone[key] = goog.cloneObject(obj[key]);\r\n    }\r\n    return clone;\r\n  }\r\n\r\n  return obj;\r\n};\r\n\r\n\r\n/**\r\n * A native implementation of goog.bind.\r\n * @param {?function(this:T, ...)} fn A function to partially apply.\r\n * @param {T} selfObj Specifies the object which this should point to when the\r\n *     function is run.\r\n * @param {...*} var_args Additional arguments that are partially applied to the\r\n *     function.\r\n * @return {!Function} A partially-applied form of the function goog.bind() was\r\n *     invoked as a method of.\r\n * @template T\r\n * @private\r\n */\r\ngoog.bindNative_ = function(fn, selfObj, var_args) {\r\n  return /** @type {!Function} */ (fn.call.apply(fn.bind, arguments));\r\n};\r\n\r\n\r\n/**\r\n * A pure-JS implementation of goog.bind.\r\n * @param {?function(this:T, ...)} fn A function to partially apply.\r\n * @param {T} selfObj Specifies the object which this should point to when the\r\n *     function is run.\r\n * @param {...*} var_args Additional arguments that are partially applied to the\r\n *     function.\r\n * @return {!Function} A partially-applied form of the function goog.bind() was\r\n *     invoked as a method of.\r\n * @template T\r\n * @private\r\n */\r\ngoog.bindJs_ = function(fn, selfObj, var_args) {\r\n  if (!fn) {\r\n    throw new Error();\r\n  }\r\n\r\n  if (arguments.length > 2) {\r\n    var boundArgs = Array.prototype.slice.call(arguments, 2);\r\n    return function() {\r\n      // Prepend the bound arguments to the current arguments.\r\n      var newArgs = Array.prototype.slice.call(arguments);\r\n      Array.prototype.unshift.apply(newArgs, boundArgs);\r\n      return fn.apply(selfObj, newArgs);\r\n    };\r\n\r\n  } else {\r\n    return function() {\r\n      return fn.apply(selfObj, arguments);\r\n    };\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Partially applies this function to a particular 'this object' and zero or\r\n * more arguments. The result is a new function with some arguments of the first\r\n * function pre-filled and the value of this 'pre-specified'.\r\n *\r\n * Remaining arguments specified at call-time are appended to the pre-specified\r\n * ones.\r\n *\r\n * Also see: {@link #partial}.\r\n *\r\n * Usage:\r\n * <pre>var barMethBound = goog.bind(myFunction, myObj, 'arg1', 'arg2');\r\n * barMethBound('arg3', 'arg4');</pre>\r\n *\r\n * @param {?function(this:T, ...)} fn A function to partially apply.\r\n * @param {T} selfObj Specifies the object which this should point to when the\r\n *     function is run.\r\n * @param {...*} var_args Additional arguments that are partially applied to the\r\n *     function.\r\n * @return {!Function} A partially-applied form of the function goog.bind() was\r\n *     invoked as a method of.\r\n * @template T\r\n * @suppress {deprecated} See above.\r\n */\r\ngoog.bind = function(fn, selfObj, var_args) {\r\n  // TODO(nicksantos): narrow the type signature.\r\n  if (Function.prototype.bind &&\r\n      // NOTE(nicksantos): Somebody pulled base.js into the default Chrome\r\n      // extension environment. This means that for Chrome extensions, they get\r\n      // the implementation of Function.prototype.bind that calls goog.bind\r\n      // instead of the native one. Even worse, we don't want to introduce a\r\n      // circular dependency between goog.bind and Function.prototype.bind, so\r\n      // we have to hack this to make sure it works correctly.\r\n      Function.prototype.bind.toString().indexOf('native code') != -1) {\r\n    goog.bind = goog.bindNative_;\r\n  } else {\r\n    goog.bind = goog.bindJs_;\r\n  }\r\n  return goog.bind.apply(null, arguments);\r\n};\r\n\r\n\r\n/**\r\n * Like goog.bind(), except that a 'this object' is not required. Useful when\r\n * the target function is already bound.\r\n *\r\n * Usage:\r\n * var g = goog.partial(f, arg1, arg2);\r\n * g(arg3, arg4);\r\n *\r\n * @param {Function} fn A function to partially apply.\r\n * @param {...*} var_args Additional arguments that are partially applied to fn.\r\n * @return {!Function} A partially-applied form of the function goog.partial()\r\n *     was invoked as a method of.\r\n */\r\ngoog.partial = function(fn, var_args) {\r\n  var args = Array.prototype.slice.call(arguments, 1);\r\n  return function() {\r\n    // Clone the array (with slice()) and append additional arguments\r\n    // to the existing arguments.\r\n    var newArgs = args.slice();\r\n    newArgs.push.apply(newArgs, arguments);\r\n    return fn.apply(/** @type {?} */ (this), newArgs);\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Copies all the members of a source object to a target object. This method\r\n * does not work on all browsers for all objects that contain keys such as\r\n * toString or hasOwnProperty. Use goog.object.extend for this purpose.\r\n * @param {Object} target Target.\r\n * @param {Object} source Source.\r\n */\r\ngoog.mixin = function(target, source) {\r\n  for (var x in source) {\r\n    target[x] = source[x];\r\n  }\r\n\r\n  // For IE7 or lower, the for-in-loop does not contain any properties that are\r\n  // not enumerable on the prototype object (for example, isPrototypeOf from\r\n  // Object.prototype) but also it will not include 'replace' on objects that\r\n  // extend String and change 'replace' (not that it is common for anyone to\r\n  // extend anything except Object).\r\n};\r\n\r\n\r\n/**\r\n * @return {number} An integer value representing the number of milliseconds\r\n *     between midnight, January 1, 1970 and the current time.\r\n */\r\ngoog.now = (goog.TRUSTED_SITE && Date.now) || (function() {\r\n             // Unary plus operator converts its operand to a number which in\r\n             // the case of\r\n             // a date is done by calling getTime().\r\n             return +new Date();\r\n           });\r\n\r\n\r\n/**\r\n * Evals JavaScript in the global scope.  In IE this uses execScript, other\r\n * browsers use goog.global.eval. If goog.global.eval does not evaluate in the\r\n * global scope (for example, in Safari), appends a script tag instead.\r\n * Throws an exception if neither execScript or eval is defined.\r\n * @param {string} script JavaScript string.\r\n */\r\ngoog.globalEval = function(script) {\r\n  if (goog.global.execScript) {\r\n    goog.global.execScript(script, 'JavaScript');\r\n  } else if (goog.global.eval) {\r\n    // Test to see if eval works\r\n    if (goog.evalWorksForGlobals_ == null) {\r\n      try {\r\n        goog.global.eval('var _evalTest_ = 1;');\r\n      } catch (ignore) {\r\n      }\r\n      if (typeof goog.global['_evalTest_'] != 'undefined') {\r\n        try {\r\n          delete goog.global['_evalTest_'];\r\n        } catch (ignore) {\r\n          // Microsoft edge fails the deletion above in strict mode.\r\n        }\r\n        goog.evalWorksForGlobals_ = true;\r\n      } else {\r\n        goog.evalWorksForGlobals_ = false;\r\n      }\r\n    }\r\n\r\n    if (goog.evalWorksForGlobals_) {\r\n      goog.global.eval(script);\r\n    } else {\r\n      /** @type {!Document} */\r\n      var doc = goog.global.document;\r\n      var scriptElt =\r\n          /** @type {!HTMLScriptElement} */ (doc.createElement('SCRIPT'));\r\n      scriptElt.type = 'text/javascript';\r\n      scriptElt.defer = false;\r\n      // Note(user): can't use .innerHTML since \"t('<test>')\" will fail and\r\n      // .text doesn't work in Safari 2.  Therefore we append a text node.\r\n      scriptElt.appendChild(doc.createTextNode(script));\r\n      doc.head.appendChild(scriptElt);\r\n      doc.head.removeChild(scriptElt);\r\n    }\r\n  } else {\r\n    throw new Error('goog.globalEval not available');\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Indicates whether or not we can call 'eval' directly to eval code in the\r\n * global scope. Set to a Boolean by the first call to goog.globalEval (which\r\n * empirically tests whether eval works for globals). @see goog.globalEval\r\n * @type {?boolean}\r\n * @private\r\n */\r\ngoog.evalWorksForGlobals_ = null;\r\n\r\n\r\n/**\r\n * Optional map of CSS class names to obfuscated names used with\r\n * goog.getCssName().\r\n * @private {!Object<string, string>|undefined}\r\n * @see goog.setCssNameMapping\r\n */\r\ngoog.cssNameMapping_;\r\n\r\n\r\n/**\r\n * Optional obfuscation style for CSS class names. Should be set to either\r\n * 'BY_WHOLE' or 'BY_PART' if defined.\r\n * @type {string|undefined}\r\n * @private\r\n * @see goog.setCssNameMapping\r\n */\r\ngoog.cssNameMappingStyle_;\r\n\r\n\r\n\r\n/**\r\n * A hook for modifying the default behavior goog.getCssName. The function\r\n * if present, will receive the standard output of the goog.getCssName as\r\n * its input.\r\n *\r\n * @type {(function(string):string)|undefined}\r\n */\r\ngoog.global.CLOSURE_CSS_NAME_MAP_FN;\r\n\r\n\r\n/**\r\n * Handles strings that are intended to be used as CSS class names.\r\n *\r\n * This function works in tandem with @see goog.setCssNameMapping.\r\n *\r\n * Without any mapping set, the arguments are simple joined with a hyphen and\r\n * passed through unaltered.\r\n *\r\n * When there is a mapping, there are two possible styles in which these\r\n * mappings are used. In the BY_PART style, each part (i.e. in between hyphens)\r\n * of the passed in css name is rewritten according to the map. In the BY_WHOLE\r\n * style, the full css name is looked up in the map directly. If a rewrite is\r\n * not specified by the map, the compiler will output a warning.\r\n *\r\n * When the mapping is passed to the compiler, it will replace calls to\r\n * goog.getCssName with the strings from the mapping, e.g.\r\n *     var x = goog.getCssName('foo');\r\n *     var y = goog.getCssName(this.baseClass, 'active');\r\n *  becomes:\r\n *     var x = 'foo';\r\n *     var y = this.baseClass + '-active';\r\n *\r\n * If one argument is passed it will be processed, if two are passed only the\r\n * modifier will be processed, as it is assumed the first argument was generated\r\n * as a result of calling goog.getCssName.\r\n *\r\n * @param {string} className The class name.\r\n * @param {string=} opt_modifier A modifier to be appended to the class name.\r\n * @return {string} The class name or the concatenation of the class name and\r\n *     the modifier.\r\n */\r\ngoog.getCssName = function(className, opt_modifier) {\r\n  // String() is used for compatibility with compiled soy where the passed\r\n  // className can be non-string objects.\r\n  if (String(className).charAt(0) == '.') {\r\n    throw new Error(\r\n        'className passed in goog.getCssName must not start with \".\".' +\r\n        ' You passed: ' + className);\r\n  }\r\n\r\n  var getMapping = function(cssName) {\r\n    return goog.cssNameMapping_[cssName] || cssName;\r\n  };\r\n\r\n  var renameByParts = function(cssName) {\r\n    // Remap all the parts individually.\r\n    var parts = cssName.split('-');\r\n    var mapped = [];\r\n    for (var i = 0; i < parts.length; i++) {\r\n      mapped.push(getMapping(parts[i]));\r\n    }\r\n    return mapped.join('-');\r\n  };\r\n\r\n  var rename;\r\n  if (goog.cssNameMapping_) {\r\n    rename =\r\n        goog.cssNameMappingStyle_ == 'BY_WHOLE' ? getMapping : renameByParts;\r\n  } else {\r\n    rename = function(a) {\r\n      return a;\r\n    };\r\n  }\r\n\r\n  var result =\r\n      opt_modifier ? className + '-' + rename(opt_modifier) : rename(className);\r\n\r\n  // The special CLOSURE_CSS_NAME_MAP_FN allows users to specify further\r\n  // processing of the class name.\r\n  if (goog.global.CLOSURE_CSS_NAME_MAP_FN) {\r\n    return goog.global.CLOSURE_CSS_NAME_MAP_FN(result);\r\n  }\r\n\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * Sets the map to check when returning a value from goog.getCssName(). Example:\r\n * <pre>\r\n * goog.setCssNameMapping({\r\n *   \"goog\": \"a\",\r\n *   \"disabled\": \"b\",\r\n * });\r\n *\r\n * var x = goog.getCssName('goog');\r\n * // The following evaluates to: \"a a-b\".\r\n * goog.getCssName('goog') + ' ' + goog.getCssName(x, 'disabled')\r\n * </pre>\r\n * When declared as a map of string literals to string literals, the JSCompiler\r\n * will replace all calls to goog.getCssName() using the supplied map if the\r\n * --process_closure_primitives flag is set.\r\n *\r\n * @param {!Object} mapping A map of strings to strings where keys are possible\r\n *     arguments to goog.getCssName() and values are the corresponding values\r\n *     that should be returned.\r\n * @param {string=} opt_style The style of css name mapping. There are two valid\r\n *     options: 'BY_PART', and 'BY_WHOLE'.\r\n * @see goog.getCssName for a description.\r\n */\r\ngoog.setCssNameMapping = function(mapping, opt_style) {\r\n  goog.cssNameMapping_ = mapping;\r\n  goog.cssNameMappingStyle_ = opt_style;\r\n};\r\n\r\n\r\n/**\r\n * To use CSS renaming in compiled mode, one of the input files should have a\r\n * call to goog.setCssNameMapping() with an object literal that the JSCompiler\r\n * can extract and use to replace all calls to goog.getCssName(). In uncompiled\r\n * mode, JavaScript code should be loaded before this base.js file that declares\r\n * a global variable, CLOSURE_CSS_NAME_MAPPING, which is used below. This is\r\n * to ensure that the mapping is loaded before any calls to goog.getCssName()\r\n * are made in uncompiled mode.\r\n *\r\n * A hook for overriding the CSS name mapping.\r\n * @type {!Object<string, string>|undefined}\r\n */\r\ngoog.global.CLOSURE_CSS_NAME_MAPPING;\r\n\r\n\r\nif (!COMPILED && goog.global.CLOSURE_CSS_NAME_MAPPING) {\r\n  // This does not call goog.setCssNameMapping() because the JSCompiler\r\n  // requires that goog.setCssNameMapping() be called with an object literal.\r\n  goog.cssNameMapping_ = goog.global.CLOSURE_CSS_NAME_MAPPING;\r\n}\r\n\r\n\r\n/**\r\n * Gets a localized message.\r\n *\r\n * This function is a compiler primitive. If you give the compiler a localized\r\n * message bundle, it will replace the string at compile-time with a localized\r\n * version, and expand goog.getMsg call to a concatenated string.\r\n *\r\n * Messages must be initialized in the form:\r\n * <code>\r\n * var MSG_NAME = goog.getMsg('Hello {$placeholder}', {'placeholder': 'world'});\r\n * </code>\r\n *\r\n * This function produces a string which should be treated as plain text. Use\r\n * {@link goog.html.SafeHtmlFormatter} in conjunction with goog.getMsg to\r\n * produce SafeHtml.\r\n *\r\n * @param {string} str Translatable string, places holders in the form {$foo}.\r\n * @param {Object<string, string>=} opt_values Maps place holder name to value.\r\n * @return {string} message with placeholders filled.\r\n */\r\ngoog.getMsg = function(str, opt_values) {\r\n  if (opt_values) {\r\n    str = str.replace(/\\{\\$([^}]+)}/g, function(match, key) {\r\n      return (opt_values != null && key in opt_values) ? opt_values[key] :\r\n                                                         match;\r\n    });\r\n  }\r\n  return str;\r\n};\r\n\r\n\r\n/**\r\n * Gets a localized message. If the message does not have a translation, gives a\r\n * fallback message.\r\n *\r\n * This is useful when introducing a new message that has not yet been\r\n * translated into all languages.\r\n *\r\n * This function is a compiler primitive. Must be used in the form:\r\n * <code>var x = goog.getMsgWithFallback(MSG_A, MSG_B);</code>\r\n * where MSG_A and MSG_B were initialized with goog.getMsg.\r\n *\r\n * @param {string} a The preferred message.\r\n * @param {string} b The fallback message.\r\n * @return {string} The best translated message.\r\n */\r\ngoog.getMsgWithFallback = function(a, b) {\r\n  return a;\r\n};\r\n\r\n\r\n/**\r\n * Exposes an unobfuscated global namespace path for the given object.\r\n * Note that fields of the exported object *will* be obfuscated, unless they are\r\n * exported in turn via this function or goog.exportProperty.\r\n *\r\n * Also handy for making public items that are defined in anonymous closures.\r\n *\r\n * ex. goog.exportSymbol('public.path.Foo', Foo);\r\n *\r\n * ex. goog.exportSymbol('public.path.Foo.staticFunction', Foo.staticFunction);\r\n *     public.path.Foo.staticFunction();\r\n *\r\n * ex. goog.exportSymbol('public.path.Foo.prototype.myMethod',\r\n *                       Foo.prototype.myMethod);\r\n *     new public.path.Foo().myMethod();\r\n *\r\n * @param {string} publicPath Unobfuscated name to export.\r\n * @param {*} object Object the name should point to.\r\n * @param {Object=} opt_objectToExportTo The object to add the path to; default\r\n *     is goog.global.\r\n */\r\ngoog.exportSymbol = function(publicPath, object, opt_objectToExportTo) {\r\n  goog.exportPath_(publicPath, object, opt_objectToExportTo);\r\n};\r\n\r\n\r\n/**\r\n * Exports a property unobfuscated into the object's namespace.\r\n * ex. goog.exportProperty(Foo, 'staticFunction', Foo.staticFunction);\r\n * ex. goog.exportProperty(Foo.prototype, 'myMethod', Foo.prototype.myMethod);\r\n * @param {Object} object Object whose static property is being exported.\r\n * @param {string} publicName Unobfuscated name to export.\r\n * @param {*} symbol Object the name should point to.\r\n */\r\ngoog.exportProperty = function(object, publicName, symbol) {\r\n  object[publicName] = symbol;\r\n};\r\n\r\n\r\n/**\r\n * Inherit the prototype methods from one constructor into another.\r\n *\r\n * Usage:\r\n * <pre>\r\n * function ParentClass(a, b) { }\r\n * ParentClass.prototype.foo = function(a) { };\r\n *\r\n * function ChildClass(a, b, c) {\r\n *   ChildClass.base(this, 'constructor', a, b);\r\n * }\r\n * goog.inherits(ChildClass, ParentClass);\r\n *\r\n * var child = new ChildClass('a', 'b', 'see');\r\n * child.foo(); // This works.\r\n * </pre>\r\n *\r\n * @param {!Function} childCtor Child class.\r\n * @param {!Function} parentCtor Parent class.\r\n * @suppress {strictMissingProperties} superClass_ and base is not defined on\r\n *    Function.\r\n */\r\ngoog.inherits = function(childCtor, parentCtor) {\r\n  /** @constructor */\r\n  function tempCtor() {}\r\n  tempCtor.prototype = parentCtor.prototype;\r\n  childCtor.superClass_ = parentCtor.prototype;\r\n  childCtor.prototype = new tempCtor();\r\n  /** @override */\r\n  childCtor.prototype.constructor = childCtor;\r\n\r\n  /**\r\n   * Calls superclass constructor/method.\r\n   *\r\n   * This function is only available if you use goog.inherits to\r\n   * express inheritance relationships between classes.\r\n   *\r\n   * NOTE: This is a replacement for goog.base and for superClass_\r\n   * property defined in childCtor.\r\n   *\r\n   * @param {!Object} me Should always be \"this\".\r\n   * @param {string} methodName The method name to call. Calling\r\n   *     superclass constructor can be done with the special string\r\n   *     'constructor'.\r\n   * @param {...*} var_args The arguments to pass to superclass\r\n   *     method/constructor.\r\n   * @return {*} The return value of the superclass method/constructor.\r\n   */\r\n  childCtor.base = function(me, methodName, var_args) {\r\n    // Copying using loop to avoid deop due to passing arguments object to\r\n    // function. This is faster in many JS engines as of late 2014.\r\n    var args = new Array(arguments.length - 2);\r\n    for (var i = 2; i < arguments.length; i++) {\r\n      args[i - 2] = arguments[i];\r\n    }\r\n    return parentCtor.prototype[methodName].apply(me, args);\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Call up to the superclass.\r\n *\r\n * If this is called from a constructor, then this calls the superclass\r\n * constructor with arguments 1-N.\r\n *\r\n * If this is called from a prototype method, then you must pass the name of the\r\n * method as the second argument to this function. If you do not, you will get a\r\n * runtime error. This calls the superclass' method with arguments 2-N.\r\n *\r\n * This function only works if you use goog.inherits to express inheritance\r\n * relationships between your classes.\r\n *\r\n * This function is a compiler primitive. At compile-time, the compiler will do\r\n * macro expansion to remove a lot of the extra overhead that this function\r\n * introduces. The compiler will also enforce a lot of the assumptions that this\r\n * function makes, and treat it as a compiler error if you break them.\r\n *\r\n * @param {!Object} me Should always be \"this\".\r\n * @param {*=} opt_methodName The method name if calling a super method.\r\n * @param {...*} var_args The rest of the arguments.\r\n * @return {*} The return value of the superclass method.\r\n * @suppress {es5Strict} This method can not be used in strict mode, but\r\n *     all Closure Library consumers must depend on this file.\r\n * @deprecated goog.base is not strict mode compatible.  Prefer the static\r\n *     \"base\" method added to the constructor by goog.inherits\r\n *     or ES6 classes and the \"super\" keyword.\r\n */\r\ngoog.base = function(me, opt_methodName, var_args) {\r\n  var caller = arguments.callee.caller;\r\n\r\n  if (goog.STRICT_MODE_COMPATIBLE || (goog.DEBUG && !caller)) {\r\n    throw new Error(\r\n        'arguments.caller not defined.  goog.base() cannot be used ' +\r\n        'with strict mode code. See ' +\r\n        'http://www.ecma-international.org/ecma-262/5.1/#sec-C');\r\n  }\r\n\r\n  if (typeof caller.superClass_ !== 'undefined') {\r\n    // Copying using loop to avoid deop due to passing arguments object to\r\n    // function. This is faster in many JS engines as of late 2014.\r\n    var ctorArgs = new Array(arguments.length - 1);\r\n    for (var i = 1; i < arguments.length; i++) {\r\n      ctorArgs[i - 1] = arguments[i];\r\n    }\r\n    // This is a constructor. Call the superclass constructor.\r\n    return /** @type {!Function} */ (caller.superClass_)\r\n        .constructor.apply(me, ctorArgs);\r\n  }\r\n\r\n  if (typeof opt_methodName != 'string' && typeof opt_methodName != 'symbol') {\r\n    throw new Error(\r\n        'method names provided to goog.base must be a string or a symbol');\r\n  }\r\n\r\n  // Copying using loop to avoid deop due to passing arguments object to\r\n  // function. This is faster in many JS engines as of late 2014.\r\n  var args = new Array(arguments.length - 2);\r\n  for (var i = 2; i < arguments.length; i++) {\r\n    args[i - 2] = arguments[i];\r\n  }\r\n  var foundCaller = false;\r\n  for (var ctor = me.constructor; ctor;\r\n       ctor = ctor.superClass_ && ctor.superClass_.constructor) {\r\n    if (ctor.prototype[opt_methodName] === caller) {\r\n      foundCaller = true;\r\n    } else if (foundCaller) {\r\n      return ctor.prototype[opt_methodName].apply(me, args);\r\n    }\r\n  }\r\n\r\n  // If we did not find the caller in the prototype chain, then one of two\r\n  // things happened:\r\n  // 1) The caller is an instance method.\r\n  // 2) This method was not called by the right caller.\r\n  if (me[opt_methodName] === caller) {\r\n    return me.constructor.prototype[opt_methodName].apply(me, args);\r\n  } else {\r\n    throw new Error(\r\n        'goog.base called from a method of one name ' +\r\n        'to a method of a different name');\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Allow for aliasing within scope functions.  This function exists for\r\n * uncompiled code - in compiled code the calls will be inlined and the aliases\r\n * applied.  In uncompiled code the function is simply run since the aliases as\r\n * written are valid JavaScript.\r\n *\r\n *\r\n * @param {function()} fn Function to call.  This function can contain aliases\r\n *     to namespaces (e.g. \"var dom = goog.dom\") or classes\r\n *     (e.g. \"var Timer = goog.Timer\").\r\n */\r\ngoog.scope = function(fn) {\r\n  if (goog.isInModuleLoader_()) {\r\n    throw new Error('goog.scope is not supported within a module.');\r\n  }\r\n  fn.call(goog.global);\r\n};\r\n\r\n\r\n/*\r\n * To support uncompiled, strict mode bundles that use eval to divide source\r\n * like so:\r\n *    eval('someSource;//# sourceUrl sourcefile.js');\r\n * We need to export the globally defined symbols \"goog\" and \"COMPILED\".\r\n * Exporting \"goog\" breaks the compiler optimizations, so we required that\r\n * be defined externally.\r\n * NOTE: We don't use goog.exportSymbol here because we don't want to trigger\r\n * extern generation when that compiler option is enabled.\r\n */\r\nif (!COMPILED) {\r\n  goog.global['COMPILED'] = COMPILED;\r\n}\r\n\r\n\r\n//==============================================================================\r\n// goog.defineClass implementation\r\n//==============================================================================\r\n\r\n\r\n/**\r\n * Creates a restricted form of a Closure \"class\":\r\n *   - from the compiler's perspective, the instance returned from the\r\n *     constructor is sealed (no new properties may be added).  This enables\r\n *     better checks.\r\n *   - the compiler will rewrite this definition to a form that is optimal\r\n *     for type checking and optimization (initially this will be a more\r\n *     traditional form).\r\n *\r\n * @param {Function} superClass The superclass, Object or null.\r\n * @param {goog.defineClass.ClassDescriptor} def\r\n *     An object literal describing\r\n *     the class.  It may have the following properties:\r\n *     \"constructor\": the constructor function\r\n *     \"statics\": an object literal containing methods to add to the constructor\r\n *        as \"static\" methods or a function that will receive the constructor\r\n *        function as its only parameter to which static properties can\r\n *        be added.\r\n *     all other properties are added to the prototype.\r\n * @return {!Function} The class constructor.\r\n */\r\ngoog.defineClass = function(superClass, def) {\r\n  // TODO(johnlenz): consider making the superClass an optional parameter.\r\n  var constructor = def.constructor;\r\n  var statics = def.statics;\r\n  // Wrap the constructor prior to setting up the prototype and static methods.\r\n  if (!constructor || constructor == Object.prototype.constructor) {\r\n    constructor = function() {\r\n      throw new Error(\r\n          'cannot instantiate an interface (no constructor defined).');\r\n    };\r\n  }\r\n\r\n  var cls = goog.defineClass.createSealingConstructor_(constructor, superClass);\r\n  if (superClass) {\r\n    goog.inherits(cls, superClass);\r\n  }\r\n\r\n  // Remove all the properties that should not be copied to the prototype.\r\n  delete def.constructor;\r\n  delete def.statics;\r\n\r\n  goog.defineClass.applyProperties_(cls.prototype, def);\r\n  if (statics != null) {\r\n    if (statics instanceof Function) {\r\n      statics(cls);\r\n    } else {\r\n      goog.defineClass.applyProperties_(cls, statics);\r\n    }\r\n  }\r\n\r\n  return cls;\r\n};\r\n\r\n\r\n/**\r\n * @typedef {{\r\n *   constructor: (!Function|undefined),\r\n *   statics: (Object|undefined|function(Function):void)\r\n * }}\r\n */\r\ngoog.defineClass.ClassDescriptor;\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the instances returned by goog.defineClass should\r\n *     be sealed when possible.\r\n *\r\n * When sealing is disabled the constructor function will not be wrapped by\r\n * goog.defineClass, making it incompatible with ES6 class methods.\r\n */\r\ngoog.defineClass.SEAL_CLASS_INSTANCES =\r\n    goog.define('goog.defineClass.SEAL_CLASS_INSTANCES', goog.DEBUG);\r\n\r\n\r\n/**\r\n * If goog.defineClass.SEAL_CLASS_INSTANCES is enabled and Object.seal is\r\n * defined, this function will wrap the constructor in a function that seals the\r\n * results of the provided constructor function.\r\n *\r\n * @param {!Function} ctr The constructor whose results maybe be sealed.\r\n * @param {Function} superClass The superclass constructor.\r\n * @return {!Function} The replacement constructor.\r\n * @private\r\n */\r\ngoog.defineClass.createSealingConstructor_ = function(ctr, superClass) {\r\n  if (!goog.defineClass.SEAL_CLASS_INSTANCES) {\r\n    // Do now wrap the constructor when sealing is disabled. Angular code\r\n    // depends on this for injection to work properly.\r\n    return ctr;\r\n  }\r\n\r\n  // Compute whether the constructor is sealable at definition time, rather\r\n  // than when the instance is being constructed.\r\n  var superclassSealable = !goog.defineClass.isUnsealable_(superClass);\r\n\r\n  /**\r\n   * @this {Object}\r\n   * @return {?}\r\n   */\r\n  var wrappedCtr = function() {\r\n    // Don't seal an instance of a subclass when it calls the constructor of\r\n    // its super class as there is most likely still setup to do.\r\n    var instance = ctr.apply(this, arguments) || this;\r\n    instance[goog.UID_PROPERTY_] = instance[goog.UID_PROPERTY_];\r\n\r\n    if (this.constructor === wrappedCtr && superclassSealable &&\r\n        Object.seal instanceof Function) {\r\n      Object.seal(instance);\r\n    }\r\n    return instance;\r\n  };\r\n\r\n  return wrappedCtr;\r\n};\r\n\r\n\r\n/**\r\n * @param {Function} ctr The constructor to test.\r\n * @return {boolean} Whether the constructor has been tagged as unsealable\r\n *     using goog.tagUnsealableClass.\r\n * @private\r\n */\r\ngoog.defineClass.isUnsealable_ = function(ctr) {\r\n  return ctr && ctr.prototype &&\r\n      ctr.prototype[goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_];\r\n};\r\n\r\n\r\n// TODO(johnlenz): share these values with the goog.object\r\n/**\r\n * The names of the fields that are defined on Object.prototype.\r\n * @type {!Array<string>}\r\n * @private\r\n * @const\r\n */\r\ngoog.defineClass.OBJECT_PROTOTYPE_FIELDS_ = [\r\n  'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',\r\n  'toLocaleString', 'toString', 'valueOf'\r\n];\r\n\r\n\r\n// TODO(johnlenz): share this function with the goog.object\r\n/**\r\n * @param {!Object} target The object to add properties to.\r\n * @param {!Object} source The object to copy properties from.\r\n * @private\r\n */\r\ngoog.defineClass.applyProperties_ = function(target, source) {\r\n  // TODO(johnlenz): update this to support ES5 getters/setters\r\n\r\n  var key;\r\n  for (key in source) {\r\n    if (Object.prototype.hasOwnProperty.call(source, key)) {\r\n      target[key] = source[key];\r\n    }\r\n  }\r\n\r\n  // For IE the for-in-loop does not contain any properties that are not\r\n  // enumerable on the prototype object (for example isPrototypeOf from\r\n  // Object.prototype) and it will also not include 'replace' on objects that\r\n  // extend String and change 'replace' (not that it is common for anyone to\r\n  // extend anything except Object).\r\n  for (var i = 0; i < goog.defineClass.OBJECT_PROTOTYPE_FIELDS_.length; i++) {\r\n    key = goog.defineClass.OBJECT_PROTOTYPE_FIELDS_[i];\r\n    if (Object.prototype.hasOwnProperty.call(source, key)) {\r\n      target[key] = source[key];\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Sealing classes breaks the older idiom of assigning properties on the\r\n * prototype rather than in the constructor. As such, goog.defineClass\r\n * must not seal subclasses of these old-style classes until they are fixed.\r\n * Until then, this marks a class as \"broken\", instructing defineClass\r\n * not to seal subclasses.\r\n * @param {!Function} ctr The legacy constructor to tag as unsealable.\r\n */\r\ngoog.tagUnsealableClass = function(ctr) {\r\n  if (!COMPILED && goog.defineClass.SEAL_CLASS_INSTANCES) {\r\n    ctr.prototype[goog.UNSEALABLE_CONSTRUCTOR_PROPERTY_] = true;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Name for unsealable tag property.\r\n * @const @private {string}\r\n */\r\ngoog.UNSEALABLE_CONSTRUCTOR_PROPERTY_ = 'goog_defineClass_legacy_unsealable';\r\n\r\n\r\n// There's a bug in the compiler where without collapse properties the\r\n// Closure namespace defines do not guard code correctly. To help reduce code\r\n// size also check for !COMPILED even though it redundant until this is fixed.\r\nif (!COMPILED && goog.DEPENDENCIES_ENABLED) {\r\n\r\n  /**\r\n   * Tries to detect whether is in the context of an HTML document.\r\n   * @return {boolean} True if it looks like HTML document.\r\n   * @private\r\n   */\r\n  goog.inHtmlDocument_ = function() {\r\n    /** @type {!Document} */\r\n    var doc = goog.global.document;\r\n    return doc != null && 'write' in doc;  // XULDocument misses write.\r\n  };\r\n\r\n\r\n  /**\r\n   * We'd like to check for if the document readyState is 'loading'; however\r\n   * there are bugs on IE 10 and below where the readyState being anything other\r\n   * than 'complete' is not reliable.\r\n   * @return {boolean}\r\n   * @private\r\n   */\r\n  goog.isDocumentLoading_ = function() {\r\n    // attachEvent is available on IE 6 thru 10 only, and thus can be used to\r\n    // detect those browsers.\r\n    /** @type {!HTMLDocument} */\r\n    var doc = goog.global.document;\r\n    return doc.attachEvent ? doc.readyState != 'complete' :\r\n                             doc.readyState == 'loading';\r\n  };\r\n\r\n\r\n  /**\r\n   * Tries to detect the base path of base.js script that bootstraps Closure.\r\n   * @private\r\n   */\r\n  goog.findBasePath_ = function() {\r\n    if (goog.isDef(goog.global.CLOSURE_BASE_PATH) &&\r\n        // Anti DOM-clobbering runtime check (b/37736576).\r\n        goog.isString(goog.global.CLOSURE_BASE_PATH)) {\r\n      goog.basePath = goog.global.CLOSURE_BASE_PATH;\r\n      return;\r\n    } else if (!goog.inHtmlDocument_()) {\r\n      return;\r\n    }\r\n    /** @type {!Document} */\r\n    var doc = goog.global.document;\r\n    // If we have a currentScript available, use it exclusively.\r\n    var currentScript = doc.currentScript;\r\n    if (currentScript) {\r\n      var scripts = [currentScript];\r\n    } else {\r\n      var scripts = doc.getElementsByTagName('SCRIPT');\r\n    }\r\n    // Search backwards since the current script is in almost all cases the one\r\n    // that has base.js.\r\n    for (var i = scripts.length - 1; i >= 0; --i) {\r\n      var script = /** @type {!HTMLScriptElement} */ (scripts[i]);\r\n      var src = script.src;\r\n      var qmark = src.lastIndexOf('?');\r\n      var l = qmark == -1 ? src.length : qmark;\r\n      if (src.substr(l - 7, 7) == 'base.js') {\r\n        goog.basePath = src.substr(0, l - 7);\r\n        return;\r\n      }\r\n    }\r\n  };\r\n\r\n  goog.findBasePath_();\r\n\r\n  /** @struct @constructor @final */\r\n  goog.Transpiler = function() {\r\n    /** @private {?Object<string, boolean>} */\r\n    this.requiresTranspilation_ = null;\r\n    /** @private {string} */\r\n    this.transpilationTarget_ = goog.TRANSPILE_TO_LANGUAGE;\r\n  };\r\n\r\n\r\n  /**\r\n   * Returns a newly created map from language mode string to a boolean\r\n   * indicating whether transpilation should be done for that mode as well as\r\n   * the highest level language that this environment supports.\r\n   *\r\n   * Guaranteed invariant:\r\n   * For any two modes, l1 and l2 where l2 is a newer mode than l1,\r\n   * `map[l1] == true` implies that `map[l2] == true`.\r\n   *\r\n   * Note this method is extracted and used elsewhere, so it cannot rely on\r\n   * anything external (it should easily be able to be transformed into a\r\n   * standalone, top level function).\r\n   *\r\n   * @private\r\n   * @return {{\r\n   *   target: string,\r\n   *   map: !Object<string, boolean>\r\n   * }}\r\n   */\r\n  goog.Transpiler.prototype.createRequiresTranspilation_ = function() {\r\n    var transpilationTarget = 'es3';\r\n    var /** !Object<string, boolean> */ requiresTranspilation = {'es3': false};\r\n    var transpilationRequiredForAllLaterModes = false;\r\n\r\n    /**\r\n     * Adds an entry to requiresTranspliation for the given language mode.\r\n     *\r\n     * IMPORTANT: Calls must be made in order from oldest to newest language\r\n     * mode.\r\n     * @param {string} modeName\r\n     * @param {function(): boolean} isSupported Returns true if the JS engine\r\n     *     supports the given mode.\r\n     */\r\n    function addNewerLanguageTranspilationCheck(modeName, isSupported) {\r\n      if (transpilationRequiredForAllLaterModes) {\r\n        requiresTranspilation[modeName] = true;\r\n      } else if (isSupported()) {\r\n        transpilationTarget = modeName;\r\n        requiresTranspilation[modeName] = false;\r\n      } else {\r\n        requiresTranspilation[modeName] = true;\r\n        transpilationRequiredForAllLaterModes = true;\r\n      }\r\n    }\r\n\r\n    /**\r\n     * Does the given code evaluate without syntax errors and return a truthy\r\n     * result?\r\n     */\r\n    function /** boolean */ evalCheck(/** string */ code) {\r\n      try {\r\n        return !!eval(code);\r\n      } catch (ignored) {\r\n        return false;\r\n      }\r\n    }\r\n\r\n    var userAgent = goog.global.navigator && goog.global.navigator.userAgent ?\r\n        goog.global.navigator.userAgent :\r\n        '';\r\n\r\n    // Identify ES3-only browsers by their incorrect treatment of commas.\r\n    addNewerLanguageTranspilationCheck('es5', function() {\r\n      return evalCheck('[1,].length==1');\r\n    });\r\n    addNewerLanguageTranspilationCheck('es6', function() {\r\n      // Edge has a non-deterministic (i.e., not reproducible) bug with ES6:\r\n      // https://github.com/Microsoft/ChakraCore/issues/1496.\r\n      var re = /Edge\\/(\\d+)(\\.\\d)*/i;\r\n      var edgeUserAgent = userAgent.match(re);\r\n      if (edgeUserAgent) {\r\n        // The Reflect.construct test below is flaky on Edge. It can sometimes\r\n        // pass or fail on 40 15.15063, so just exit early for Edge and treat\r\n        // it as ES5. Until we're on a more up to date version just always use\r\n        // ES5. See https://github.com/Microsoft/ChakraCore/issues/3217.\r\n        return false;\r\n      }\r\n      // Test es6: [FF50 (?), Edge 14 (?), Chrome 50]\r\n      //   (a) default params (specifically shadowing locals),\r\n      //   (b) destructuring, (c) block-scoped functions,\r\n      //   (d) for-of (const), (e) new.target/Reflect.construct\r\n      var es6fullTest =\r\n          'class X{constructor(){if(new.target!=String)throw 1;this.x=42}}' +\r\n          'let q=Reflect.construct(X,[],String);if(q.x!=42||!(q instanceof ' +\r\n          'String))throw 1;for(const a of[2,3]){if(a==2)continue;function ' +\r\n          'f(z={a}){let a=0;return z.a}{function f(){return 0;}}return f()' +\r\n          '==3}';\r\n\r\n      return evalCheck('(()=>{\"use strict\";' + es6fullTest + '})()');\r\n    });\r\n    // ** and **= are the only new features in 'es7'\r\n    addNewerLanguageTranspilationCheck('es7', function() {\r\n      return evalCheck('2 ** 2 == 4');\r\n    });\r\n    // async functions are the only new features in 'es8'\r\n    addNewerLanguageTranspilationCheck('es8', function() {\r\n      return evalCheck('async () => 1, true');\r\n    });\r\n    addNewerLanguageTranspilationCheck('es9', function() {\r\n      return evalCheck('({...rest} = {}), true');\r\n    });\r\n    addNewerLanguageTranspilationCheck('es_next', function() {\r\n      return false;  // assume it always need to transpile\r\n    });\r\n    return {target: transpilationTarget, map: requiresTranspilation};\r\n  };\r\n\r\n\r\n  /**\r\n   * Determines whether the given language needs to be transpiled.\r\n   * @param {string} lang\r\n   * @param {string|undefined} module\r\n   * @return {boolean}\r\n   */\r\n  goog.Transpiler.prototype.needsTranspile = function(lang, module) {\r\n    if (goog.TRANSPILE == 'always') {\r\n      return true;\r\n    } else if (goog.TRANSPILE == 'never') {\r\n      return false;\r\n    } else if (!this.requiresTranspilation_) {\r\n      var obj = this.createRequiresTranspilation_();\r\n      this.requiresTranspilation_ = obj.map;\r\n      this.transpilationTarget_ = this.transpilationTarget_ || obj.target;\r\n    }\r\n    if (lang in this.requiresTranspilation_) {\r\n      if (this.requiresTranspilation_[lang]) {\r\n        return true;\r\n      } else if (\r\n          goog.inHtmlDocument_() && module == 'es6' &&\r\n          !('noModule' in goog.global.document.createElement('script'))) {\r\n        return true;\r\n      } else {\r\n        return false;\r\n      }\r\n    } else {\r\n      throw new Error('Unknown language mode: ' + lang);\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * Lazily retrieves the transpiler and applies it to the source.\r\n   * @param {string} code JS code.\r\n   * @param {string} path Path to the code.\r\n   * @return {string} The transpiled code.\r\n   */\r\n  goog.Transpiler.prototype.transpile = function(code, path) {\r\n    // TODO(johnplaisted): We should delete goog.transpile_ and just have this\r\n    // function. But there's some compile error atm where goog.global is being\r\n    // stripped incorrectly without this.\r\n    return goog.transpile_(code, path, this.transpilationTarget_);\r\n  };\r\n\r\n\r\n  /** @private @final {!goog.Transpiler} */\r\n  goog.transpiler_ = new goog.Transpiler();\r\n\r\n  /**\r\n   * Rewrites closing script tags in input to avoid ending an enclosing script\r\n   * tag.\r\n   *\r\n   * @param {string} str\r\n   * @return {string}\r\n   * @private\r\n   */\r\n  goog.protectScriptTag_ = function(str) {\r\n    return str.replace(/<\\/(SCRIPT)/ig, '\\\\x3c/$1');\r\n  };\r\n\r\n\r\n  /**\r\n   * A debug loader is responsible for downloading and executing javascript\r\n   * files in an unbundled, uncompiled environment.\r\n   *\r\n   * This can be custimized via the setDependencyFactory method, or by\r\n   * CLOSURE_IMPORT_SCRIPT/CLOSURE_LOAD_FILE_SYNC.\r\n   *\r\n   * @struct @constructor @final @private\r\n   */\r\n  goog.DebugLoader_ = function() {\r\n    /** @private @const {!Object<string, !goog.Dependency>} */\r\n    this.dependencies_ = {};\r\n    /** @private @const {!Object<string, string>} */\r\n    this.idToPath_ = {};\r\n    /** @private @const {!Object<string, boolean>} */\r\n    this.written_ = {};\r\n    /** @private @const {!Array<!goog.Dependency>} */\r\n    this.loadingDeps_ = [];\r\n    /** @private {!Array<!goog.Dependency>} */\r\n    this.depsToLoad_ = [];\r\n    /** @private {boolean} */\r\n    this.paused_ = false;\r\n    /** @private {!goog.DependencyFactory} */\r\n    this.factory_ = new goog.DependencyFactory(goog.transpiler_);\r\n    /** @private @const {!Object<string, !Function>} */\r\n    this.deferredCallbacks_ = {};\r\n    /** @private @const {!Array<string>} */\r\n    this.deferredQueue_ = [];\r\n  };\r\n\r\n  /**\r\n   * @param {!Array<string>} namespaces\r\n   * @param {function(): undefined} callback Function to call once all the\r\n   *     namespaces have loaded.\r\n   */\r\n  goog.DebugLoader_.prototype.bootstrap = function(namespaces, callback) {\r\n    var cb = callback;\r\n    function resolve() {\r\n      if (cb) {\r\n        goog.global.setTimeout(cb, 0);\r\n        cb = null;\r\n      }\r\n    }\r\n\r\n    if (!namespaces.length) {\r\n      resolve();\r\n      return;\r\n    }\r\n\r\n    var deps = [];\r\n    for (var i = 0; i < namespaces.length; i++) {\r\n      var path = this.getPathFromDeps_(namespaces[i]);\r\n      if (!path) {\r\n        throw new Error('Unregonized namespace: ' + namespaces[i]);\r\n      }\r\n      deps.push(this.dependencies_[path]);\r\n    }\r\n\r\n    var require = goog.require;\r\n    var loaded = 0;\r\n    for (var i = 0; i < namespaces.length; i++) {\r\n      require(namespaces[i]);\r\n      deps[i].onLoad(function() {\r\n        if (++loaded == namespaces.length) {\r\n          resolve();\r\n        }\r\n      });\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * Loads the Closure Dependency file.\r\n   *\r\n   * Exposed a public function so CLOSURE_NO_DEPS can be set to false, base\r\n   * loaded, setDependencyFactory called, and then this called. i.e. allows\r\n   * custom loading of the deps file.\r\n   */\r\n  goog.DebugLoader_.prototype.loadClosureDeps = function() {\r\n    // Circumvent addDependency, which would try to transpile deps.js if\r\n    // transpile is set to always.\r\n    var relPath = 'deps.js';\r\n    this.depsToLoad_.push(this.factory_.createDependency(\r\n        goog.normalizePath_(goog.basePath + relPath), relPath, [], [], {},\r\n        false));\r\n    this.loadDeps_();\r\n  };\r\n\r\n\r\n  /**\r\n   * Notifies the debug loader when a dependency has been requested.\r\n   *\r\n   * @param {string} absPathOrId Path of the dependency or goog id.\r\n   * @param {boolean=} opt_force\r\n   */\r\n  goog.DebugLoader_.prototype.requested = function(absPathOrId, opt_force) {\r\n    var path = this.getPathFromDeps_(absPathOrId);\r\n    if (path &&\r\n        (opt_force || this.areDepsLoaded_(this.dependencies_[path].requires))) {\r\n      var callback = this.deferredCallbacks_[path];\r\n      if (callback) {\r\n        delete this.deferredCallbacks_[path];\r\n        callback();\r\n      }\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * Sets the dependency factory, which can be used to create custom\r\n   * goog.Dependency implementations to control how dependencies are loaded.\r\n   *\r\n   * @param {!goog.DependencyFactory} factory\r\n   */\r\n  goog.DebugLoader_.prototype.setDependencyFactory = function(factory) {\r\n    this.factory_ = factory;\r\n  };\r\n\r\n\r\n  /**\r\n   * Travserses the dependency graph and queues the given dependency, and all of\r\n   * its transitive dependencies, for loading and then starts loading if not\r\n   * paused.\r\n   *\r\n   * @param {string} namespace\r\n   * @private\r\n   */\r\n  goog.DebugLoader_.prototype.load_ = function(namespace) {\r\n    if (!this.getPathFromDeps_(namespace)) {\r\n      var errorMessage = 'goog.require could not find: ' + namespace;\r\n\r\n      goog.logToConsole_(errorMessage);\r\n      throw Error(errorMessage);\r\n    } else {\r\n      var loader = this;\r\n\r\n      var deps = [];\r\n\r\n      /** @param {string} namespace */\r\n      var visit = function(namespace) {\r\n        var path = loader.getPathFromDeps_(namespace);\r\n\r\n        if (!path) {\r\n          throw new Error('Bad dependency path or symbol: ' + namespace);\r\n        }\r\n\r\n        if (loader.written_[path]) {\r\n          return;\r\n        }\r\n\r\n        loader.written_[path] = true;\r\n\r\n        var dep = loader.dependencies_[path];\r\n        for (var i = 0; i < dep.requires.length; i++) {\r\n          if (!goog.isProvided_(dep.requires[i])) {\r\n            visit(dep.requires[i]);\r\n          }\r\n        }\r\n\r\n        deps.push(dep);\r\n      };\r\n\r\n      visit(namespace);\r\n\r\n      var wasLoading = !!this.depsToLoad_.length;\r\n      this.depsToLoad_ = this.depsToLoad_.concat(deps);\r\n\r\n      if (!this.paused_ && !wasLoading) {\r\n        this.loadDeps_();\r\n      }\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * Loads any queued dependencies until they are all loaded or paused.\r\n   *\r\n   * @private\r\n   */\r\n  goog.DebugLoader_.prototype.loadDeps_ = function() {\r\n    var loader = this;\r\n    var paused = this.paused_;\r\n\r\n    while (this.depsToLoad_.length && !paused) {\r\n      (function() {\r\n        var loadCallDone = false;\r\n        var dep = loader.depsToLoad_.shift();\r\n\r\n        var loaded = false;\r\n        loader.loading_(dep);\r\n\r\n        var controller = {\r\n          pause: function() {\r\n            if (loadCallDone) {\r\n              throw new Error('Cannot call pause after the call to load.');\r\n            } else {\r\n              paused = true;\r\n            }\r\n          },\r\n          resume: function() {\r\n            if (loadCallDone) {\r\n              loader.resume_();\r\n            } else {\r\n              // Some dep called pause and then resume in the same load call.\r\n              // Just keep running this same loop.\r\n              paused = false;\r\n            }\r\n          },\r\n          loaded: function() {\r\n            if (loaded) {\r\n              throw new Error('Double call to loaded.');\r\n            }\r\n\r\n            loaded = true;\r\n            loader.loaded_(dep);\r\n          },\r\n          pending: function() {\r\n            // Defensive copy.\r\n            var pending = [];\r\n            for (var i = 0; i < loader.loadingDeps_.length; i++) {\r\n              pending.push(loader.loadingDeps_[i]);\r\n            }\r\n            return pending;\r\n          },\r\n          /**\r\n           * @param {goog.ModuleType} type\r\n           */\r\n          setModuleState: function(type) {\r\n            goog.moduleLoaderState_ = {\r\n              type: type,\r\n              moduleName: '',\r\n              declareLegacyNamespace: false\r\n            };\r\n          },\r\n          /** @type {function(string, string, string=)} */\r\n          registerEs6ModuleExports: function(\r\n              path, exports, opt_closureNamespace) {\r\n            if (opt_closureNamespace) {\r\n              goog.loadedModules_[opt_closureNamespace] = {\r\n                exports: exports,\r\n                type: goog.ModuleType.ES6,\r\n                moduleId: opt_closureNamespace || ''\r\n              };\r\n            }\r\n          },\r\n          /** @type {function(string, ?)} */\r\n          registerGoogModuleExports: function(moduleId, exports) {\r\n            goog.loadedModules_[moduleId] = {\r\n              exports: exports,\r\n              type: goog.ModuleType.GOOG,\r\n              moduleId: moduleId\r\n            };\r\n          },\r\n          clearModuleState: function() {\r\n            goog.moduleLoaderState_ = null;\r\n          },\r\n          defer: function(callback) {\r\n            if (loadCallDone) {\r\n              throw new Error(\r\n                  'Cannot register with defer after the call to load.');\r\n            }\r\n            loader.defer_(dep, callback);\r\n          },\r\n          areDepsLoaded: function() {\r\n            return loader.areDepsLoaded_(dep.requires);\r\n          }\r\n        };\r\n\r\n        try {\r\n          dep.load(controller);\r\n        } finally {\r\n          loadCallDone = true;\r\n        }\r\n      })();\r\n    }\r\n\r\n    if (paused) {\r\n      this.pause_();\r\n    }\r\n  };\r\n\r\n\r\n  /** @private */\r\n  goog.DebugLoader_.prototype.pause_ = function() {\r\n    this.paused_ = true;\r\n  };\r\n\r\n\r\n  /** @private */\r\n  goog.DebugLoader_.prototype.resume_ = function() {\r\n    if (this.paused_) {\r\n      this.paused_ = false;\r\n      this.loadDeps_();\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * Marks the given dependency as loading (load has been called but it has not\r\n   * yet marked itself as finished). Useful for dependencies that want to know\r\n   * what else is loading. Example: goog.modules cannot eval if there are\r\n   * loading dependencies.\r\n   *\r\n   * @param {!goog.Dependency} dep\r\n   * @private\r\n   */\r\n  goog.DebugLoader_.prototype.loading_ = function(dep) {\r\n    this.loadingDeps_.push(dep);\r\n  };\r\n\r\n\r\n  /**\r\n   * Marks the given dependency as having finished loading and being available\r\n   * for require.\r\n   *\r\n   * @param {!goog.Dependency} dep\r\n   * @private\r\n   */\r\n  goog.DebugLoader_.prototype.loaded_ = function(dep) {\r\n    for (var i = 0; i < this.loadingDeps_.length; i++) {\r\n      if (this.loadingDeps_[i] == dep) {\r\n        this.loadingDeps_.splice(i, 1);\r\n        break;\r\n      }\r\n    }\r\n\r\n    for (var i = 0; i < this.deferredQueue_.length; i++) {\r\n      if (this.deferredQueue_[i] == dep.path) {\r\n        this.deferredQueue_.splice(i, 1);\r\n        break;\r\n      }\r\n    }\r\n\r\n    if (this.loadingDeps_.length == this.deferredQueue_.length &&\r\n        !this.depsToLoad_.length) {\r\n      // Something has asked to load these, but they may not be directly\r\n      // required again later, so load them now that we know we're done loading\r\n      // everything else. e.g. a goog module entry point.\r\n      while (this.deferredQueue_.length) {\r\n        this.requested(this.deferredQueue_.shift(), true);\r\n      }\r\n    }\r\n\r\n    dep.loaded();\r\n  };\r\n\r\n\r\n  /**\r\n   * @param {!Array<string>} pathsOrIds\r\n   * @return {boolean}\r\n   * @private\r\n   */\r\n  goog.DebugLoader_.prototype.areDepsLoaded_ = function(pathsOrIds) {\r\n    for (var i = 0; i < pathsOrIds.length; i++) {\r\n      var path = this.getPathFromDeps_(pathsOrIds[i]);\r\n      if (!path ||\r\n          (!(path in this.deferredCallbacks_) &&\r\n           !goog.isProvided_(pathsOrIds[i]))) {\r\n        return false;\r\n      }\r\n    }\r\n\r\n    return true;\r\n  };\r\n\r\n\r\n  /**\r\n   * @param {string} absPathOrId\r\n   * @return {?string}\r\n   * @private\r\n   */\r\n  goog.DebugLoader_.prototype.getPathFromDeps_ = function(absPathOrId) {\r\n    if (absPathOrId in this.idToPath_) {\r\n      return this.idToPath_[absPathOrId];\r\n    } else if (absPathOrId in this.dependencies_) {\r\n      return absPathOrId;\r\n    } else {\r\n      return null;\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * @param {!goog.Dependency} dependency\r\n   * @param {!Function} callback\r\n   * @private\r\n   */\r\n  goog.DebugLoader_.prototype.defer_ = function(dependency, callback) {\r\n    this.deferredCallbacks_[dependency.path] = callback;\r\n    this.deferredQueue_.push(dependency.path);\r\n  };\r\n\r\n\r\n  /**\r\n   * Interface for goog.Dependency implementations to have some control over\r\n   * loading of dependencies.\r\n   *\r\n   * @record\r\n   */\r\n  goog.LoadController = function() {};\r\n\r\n\r\n  /**\r\n   * Tells the controller to halt loading of more dependencies.\r\n   */\r\n  goog.LoadController.prototype.pause = function() {};\r\n\r\n\r\n  /**\r\n   * Tells the controller to resume loading of more dependencies if paused.\r\n   */\r\n  goog.LoadController.prototype.resume = function() {};\r\n\r\n\r\n  /**\r\n   * Tells the controller that this dependency has finished loading.\r\n   *\r\n   * This causes this to be removed from pending() and any load callbacks to\r\n   * fire.\r\n   */\r\n  goog.LoadController.prototype.loaded = function() {};\r\n\r\n\r\n  /**\r\n   * List of dependencies on which load has been called but which have not\r\n   * called loaded on their controller. This includes the current dependency.\r\n   *\r\n   * @return {!Array<!goog.Dependency>}\r\n   */\r\n  goog.LoadController.prototype.pending = function() {};\r\n\r\n\r\n  /**\r\n   * Registers an object as an ES6 module's exports so that goog.modules may\r\n   * require it by path.\r\n   *\r\n   * @param {string} path Full path of the module.\r\n   * @param {?} exports\r\n   * @param {string=} opt_closureNamespace Closure namespace to associate with\r\n   *     this module.\r\n   */\r\n  goog.LoadController.prototype.registerEs6ModuleExports = function(\r\n      path, exports, opt_closureNamespace) {};\r\n\r\n\r\n  /**\r\n   * Sets the current module state.\r\n   *\r\n   * @param {goog.ModuleType} type Type of module.\r\n   */\r\n  goog.LoadController.prototype.setModuleState = function(type) {};\r\n\r\n\r\n  /**\r\n   * Clears the current module state.\r\n   */\r\n  goog.LoadController.prototype.clearModuleState = function() {};\r\n\r\n\r\n  /**\r\n   * Registers a callback to call once the dependency is actually requested\r\n   * via goog.require + all of the immediate dependencies have been loaded or\r\n   * all other files have been loaded. Allows for lazy loading until\r\n   * require'd without pausing dependency loading, which is needed on old IE.\r\n   *\r\n   * @param {!Function} callback\r\n   */\r\n  goog.LoadController.prototype.defer = function(callback) {};\r\n\r\n\r\n  /**\r\n   * @return {boolean}\r\n   */\r\n  goog.LoadController.prototype.areDepsLoaded = function() {};\r\n\r\n\r\n  /**\r\n   * Basic super class for all dependencies Closure Library can load.\r\n   *\r\n   * This default implementation is designed to load untranspiled, non-module\r\n   * scripts in a web broswer.\r\n   *\r\n   * For transpiled non-goog.module files {@see goog.TranspiledDependency}.\r\n   * For goog.modules see {@see goog.GoogModuleDependency}.\r\n   * For untranspiled ES6 modules {@see goog.Es6ModuleDependency}.\r\n   *\r\n   * @param {string} path Absolute path of this script.\r\n   * @param {string} relativePath Path of this script relative to goog.basePath.\r\n   * @param {!Array<string>} provides goog.provided or goog.module symbols\r\n   *     in this file.\r\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\r\n   *     this depends on.\r\n   * @param {!Object<string, string>} loadFlags\r\n   * @struct @constructor\r\n   */\r\n  goog.Dependency = function(\r\n      path, relativePath, provides, requires, loadFlags) {\r\n    /** @const */\r\n    this.path = path;\r\n    /** @const */\r\n    this.relativePath = relativePath;\r\n    /** @const */\r\n    this.provides = provides;\r\n    /** @const */\r\n    this.requires = requires;\r\n    /** @const */\r\n    this.loadFlags = loadFlags;\r\n    /** @private {boolean} */\r\n    this.loaded_ = false;\r\n    /** @private {!Array<function()>} */\r\n    this.loadCallbacks_ = [];\r\n  };\r\n\r\n\r\n  /**\r\n   * @return {string} The pathname part of this dependency's path if it is a\r\n   *     URI.\r\n   */\r\n  goog.Dependency.prototype.getPathName = function() {\r\n    var pathName = this.path;\r\n    var protocolIndex = pathName.indexOf('://');\r\n    if (protocolIndex >= 0) {\r\n      pathName = pathName.substring(protocolIndex + 3);\r\n      var slashIndex = pathName.indexOf('/');\r\n      if (slashIndex >= 0) {\r\n        pathName = pathName.substring(slashIndex + 1);\r\n      }\r\n    }\r\n    return pathName;\r\n  };\r\n\r\n\r\n  /**\r\n   * @param {function()} callback Callback to fire as soon as this has loaded.\r\n   * @final\r\n   */\r\n  goog.Dependency.prototype.onLoad = function(callback) {\r\n    if (this.loaded_) {\r\n      callback();\r\n    } else {\r\n      this.loadCallbacks_.push(callback);\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * Marks this dependency as loaded and fires any callbacks registered with\r\n   * onLoad.\r\n   * @final\r\n   */\r\n  goog.Dependency.prototype.loaded = function() {\r\n    this.loaded_ = true;\r\n    var callbacks = this.loadCallbacks_;\r\n    this.loadCallbacks_ = [];\r\n    for (var i = 0; i < callbacks.length; i++) {\r\n      callbacks[i]();\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * Whether or not document.written / appended script tags should be deferred.\r\n   *\r\n   * @private {boolean}\r\n   */\r\n  goog.Dependency.defer_ = false;\r\n\r\n\r\n  /**\r\n   * Map of script ready / state change callbacks. Old IE cannot handle putting\r\n   * these properties on goog.global.\r\n   *\r\n   * @private @const {!Object<string, function(?):undefined>}\r\n   */\r\n  goog.Dependency.callbackMap_ = {};\r\n\r\n\r\n  /**\r\n   * @param {function(...?):?} callback\r\n   * @return {string}\r\n   * @private\r\n   */\r\n  goog.Dependency.registerCallback_ = function(callback) {\r\n    var key = Math.random().toString(32);\r\n    goog.Dependency.callbackMap_[key] = callback;\r\n    return key;\r\n  };\r\n\r\n\r\n  /**\r\n   * @param {string} key\r\n   * @private\r\n   */\r\n  goog.Dependency.unregisterCallback_ = function(key) {\r\n    delete goog.Dependency.callbackMap_[key];\r\n  };\r\n\r\n\r\n  /**\r\n   * @param {string} key\r\n   * @param {...?} var_args\r\n   * @private\r\n   * @suppress {unusedPrivateMembers}\r\n   */\r\n  goog.Dependency.callback_ = function(key, var_args) {\r\n    if (key in goog.Dependency.callbackMap_) {\r\n      var callback = goog.Dependency.callbackMap_[key];\r\n      var args = [];\r\n      for (var i = 1; i < arguments.length; i++) {\r\n        args.push(arguments[i]);\r\n      }\r\n      callback.apply(undefined, args);\r\n    } else {\r\n      var errorMessage = 'Callback key ' + key +\r\n          ' does not exist (was base.js loaded more than once?).';\r\n      throw Error(errorMessage);\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * Starts loading this dependency. This dependency can pause loading if it\r\n   * needs to and resume it later via the controller interface.\r\n   *\r\n   * When this is loaded it should call controller.loaded(). Note that this will\r\n   * end up calling the loaded method of this dependency; there is no need to\r\n   * call it explicitly.\r\n   *\r\n   * @param {!goog.LoadController} controller\r\n   */\r\n  goog.Dependency.prototype.load = function(controller) {\r\n    if (goog.global.CLOSURE_IMPORT_SCRIPT) {\r\n      if (goog.global.CLOSURE_IMPORT_SCRIPT(this.path)) {\r\n        controller.loaded();\r\n      } else {\r\n        controller.pause();\r\n      }\r\n      return;\r\n    }\r\n\r\n    if (!goog.inHtmlDocument_()) {\r\n      goog.logToConsole_(\r\n          'Cannot use default debug loader outside of HTML documents.');\r\n      if (this.relativePath == 'deps.js') {\r\n        // Some old code is relying on base.js auto loading deps.js failing with\r\n        // no error before later setting CLOSURE_IMPORT_SCRIPT.\r\n        // CLOSURE_IMPORT_SCRIPT should be set *before* base.js is loaded, or\r\n        // CLOSURE_NO_DEPS set to true.\r\n        goog.logToConsole_(\r\n            'Consider setting CLOSURE_IMPORT_SCRIPT before loading base.js, ' +\r\n            'or setting CLOSURE_NO_DEPS to true.');\r\n        controller.loaded();\r\n      } else {\r\n        controller.pause();\r\n      }\r\n      return;\r\n    }\r\n\r\n    /** @type {!HTMLDocument} */\r\n    var doc = goog.global.document;\r\n\r\n    // If the user tries to require a new symbol after document load,\r\n    // something has gone terribly wrong. Doing a document.write would\r\n    // wipe out the page. This does not apply to the CSP-compliant method\r\n    // of writing script tags.\r\n    if (doc.readyState == 'complete' &&\r\n        !goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING) {\r\n      // Certain test frameworks load base.js multiple times, which tries\r\n      // to write deps.js each time. If that happens, just fail silently.\r\n      // These frameworks wipe the page between each load of base.js, so this\r\n      // is OK.\r\n      var isDeps = /\\bdeps.js$/.test(this.path);\r\n      if (isDeps) {\r\n        controller.loaded();\r\n        return;\r\n      } else {\r\n        throw Error('Cannot write \"' + this.path + '\" after document load');\r\n      }\r\n    }\r\n\r\n    if (!goog.ENABLE_CHROME_APP_SAFE_SCRIPT_LOADING &&\r\n        goog.isDocumentLoading_()) {\r\n      var key = goog.Dependency.registerCallback_(function(script) {\r\n        if (!goog.DebugLoader_.IS_OLD_IE_ || script.readyState == 'complete') {\r\n          goog.Dependency.unregisterCallback_(key);\r\n          controller.loaded();\r\n        }\r\n      });\r\n      var nonceAttr = !goog.DebugLoader_.IS_OLD_IE_ && goog.getScriptNonce() ?\r\n          ' nonce=\"' + goog.getScriptNonce() + '\"' :\r\n          '';\r\n      var event =\r\n          goog.DebugLoader_.IS_OLD_IE_ ? 'onreadystatechange' : 'onload';\r\n      var defer = goog.Dependency.defer_ ? 'defer' : '';\r\n      var script = '<script src=\"' + this.path + '\" ' + event +\r\n          '=\"goog.Dependency.callback_(\\'' + key +\r\n          '\\', this)\" type=\"text/javascript\" ' + defer + nonceAttr + '><' +\r\n          '/script>';\r\n      doc.write(\r\n          goog.TRUSTED_TYPES_POLICY_ ?\r\n              goog.TRUSTED_TYPES_POLICY_.createHTML(script) :\r\n              script);\r\n    } else {\r\n      var scriptEl =\r\n          /** @type {!HTMLScriptElement} */ (doc.createElement('script'));\r\n      scriptEl.defer = goog.Dependency.defer_;\r\n      scriptEl.async = false;\r\n      scriptEl.type = 'text/javascript';\r\n\r\n      // If CSP nonces are used, propagate them to dynamically created scripts.\r\n      // This is necessary to allow nonce-based CSPs without 'strict-dynamic'.\r\n      var nonce = goog.getScriptNonce();\r\n      if (nonce) {\r\n        scriptEl.setAttribute('nonce', nonce);\r\n      }\r\n\r\n      if (goog.DebugLoader_.IS_OLD_IE_) {\r\n        // Execution order is not guaranteed on old IE, halt loading and write\r\n        // these scripts one at a time, after each loads.\r\n        controller.pause();\r\n        scriptEl.onreadystatechange = function() {\r\n          if (scriptEl.readyState == 'loaded' ||\r\n              scriptEl.readyState == 'complete') {\r\n            controller.loaded();\r\n            controller.resume();\r\n          }\r\n        };\r\n      } else {\r\n        scriptEl.onload = function() {\r\n          scriptEl.onload = null;\r\n          controller.loaded();\r\n        };\r\n      }\r\n\r\n      scriptEl.src = goog.TRUSTED_TYPES_POLICY_ ?\r\n          goog.TRUSTED_TYPES_POLICY_.createScriptURL(this.path) :\r\n          this.path;\r\n      doc.head.appendChild(scriptEl);\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * @param {string} path Absolute path of this script.\r\n   * @param {string} relativePath Path of this script relative to goog.basePath.\r\n   * @param {!Array<string>} provides Should be an empty array.\r\n   *     TODO(johnplaisted) add support for adding closure namespaces to ES6\r\n   *     modules for interop purposes.\r\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\r\n   *     this depends on.\r\n   * @param {!Object<string, string>} loadFlags\r\n   * @struct @constructor\r\n   * @extends {goog.Dependency}\r\n   */\r\n  goog.Es6ModuleDependency = function(\r\n      path, relativePath, provides, requires, loadFlags) {\r\n    goog.Es6ModuleDependency.base(\r\n        this, 'constructor', path, relativePath, provides, requires, loadFlags);\r\n  };\r\n  goog.inherits(goog.Es6ModuleDependency, goog.Dependency);\r\n\r\n\r\n  /** @override */\r\n  goog.Es6ModuleDependency.prototype.load = function(controller) {\r\n    if (goog.global.CLOSURE_IMPORT_SCRIPT) {\r\n      if (goog.global.CLOSURE_IMPORT_SCRIPT(this.path)) {\r\n        controller.loaded();\r\n      } else {\r\n        controller.pause();\r\n      }\r\n      return;\r\n    }\r\n\r\n    if (!goog.inHtmlDocument_()) {\r\n      goog.logToConsole_(\r\n          'Cannot use default debug loader outside of HTML documents.');\r\n      controller.pause();\r\n      return;\r\n    }\r\n\r\n    /** @type {!HTMLDocument} */\r\n    var doc = goog.global.document;\r\n\r\n    var dep = this;\r\n\r\n    // TODO(johnplaisted): Does document.writing really speed up anything? Any\r\n    // difference between this and just waiting for interactive mode and then\r\n    // appending?\r\n    function write(src, contents) {\r\n      if (contents) {\r\n        var script = '<script type=\"module\" crossorigin>' + contents + '</' +\r\n            'script>';\r\n        doc.write(\r\n            goog.TRUSTED_TYPES_POLICY_ ?\r\n                goog.TRUSTED_TYPES_POLICY_.createHTML(script) :\r\n                script);\r\n      } else {\r\n        var script = '<script type=\"module\" crossorigin src=\"' + src + '\"></' +\r\n            'script>';\r\n        doc.write(\r\n            goog.TRUSTED_TYPES_POLICY_ ?\r\n                goog.TRUSTED_TYPES_POLICY_.createHTML(script) :\r\n                script);\r\n      }\r\n    }\r\n\r\n    function append(src, contents) {\r\n      var scriptEl =\r\n          /** @type {!HTMLScriptElement} */ (doc.createElement('script'));\r\n      scriptEl.defer = true;\r\n      scriptEl.async = false;\r\n      scriptEl.type = 'module';\r\n      scriptEl.setAttribute('crossorigin', true);\r\n\r\n      // If CSP nonces are used, propagate them to dynamically created scripts.\r\n      // This is necessary to allow nonce-based CSPs without 'strict-dynamic'.\r\n      var nonce = goog.getScriptNonce();\r\n      if (nonce) {\r\n        scriptEl.setAttribute('nonce', nonce);\r\n      }\r\n\r\n      if (contents) {\r\n        scriptEl.textContent = goog.TRUSTED_TYPES_POLICY_ ?\r\n            goog.TRUSTED_TYPES_POLICY_.createScript(contents) :\r\n            contents;\r\n      } else {\r\n        scriptEl.src = goog.TRUSTED_TYPES_POLICY_ ?\r\n            goog.TRUSTED_TYPES_POLICY_.createScriptURL(src) :\r\n            src;\r\n      }\r\n\r\n      doc.head.appendChild(scriptEl);\r\n    }\r\n\r\n    var create;\r\n\r\n    if (goog.isDocumentLoading_()) {\r\n      create = write;\r\n      // We can ONLY call document.write if we are guaranteed that any\r\n      // non-module script tags document.written after this are deferred.\r\n      // Small optimization, in theory document.writing is faster.\r\n      goog.Dependency.defer_ = true;\r\n    } else {\r\n      create = append;\r\n    }\r\n\r\n    // Write 4 separate tags here:\r\n    // 1) Sets the module state at the correct time (just before execution).\r\n    // 2) A src node for this, which just hopefully lets the browser load it a\r\n    //    little early (no need to parse #3).\r\n    // 3) Import the module and register it.\r\n    // 4) Clear the module state at the correct time. Guaranteed to run even\r\n    //    if there is an error in the module (#3 will not run if there is an\r\n    //    error in the module).\r\n    var beforeKey = goog.Dependency.registerCallback_(function() {\r\n      goog.Dependency.unregisterCallback_(beforeKey);\r\n      controller.setModuleState(goog.ModuleType.ES6);\r\n    });\r\n    create(undefined, 'goog.Dependency.callback_(\"' + beforeKey + '\")');\r\n\r\n    // TODO(johnplaisted): Does this really speed up anything?\r\n    create(this.path, undefined);\r\n\r\n    var registerKey = goog.Dependency.registerCallback_(function(exports) {\r\n      goog.Dependency.unregisterCallback_(registerKey);\r\n      controller.registerEs6ModuleExports(\r\n          dep.path, exports, goog.moduleLoaderState_.moduleName);\r\n    });\r\n    create(\r\n        undefined,\r\n        'import * as m from \"' + this.path + '\"; goog.Dependency.callback_(\"' +\r\n            registerKey + '\", m)');\r\n\r\n    var afterKey = goog.Dependency.registerCallback_(function() {\r\n      goog.Dependency.unregisterCallback_(afterKey);\r\n      controller.clearModuleState();\r\n      controller.loaded();\r\n    });\r\n    create(undefined, 'goog.Dependency.callback_(\"' + afterKey + '\")');\r\n  };\r\n\r\n\r\n  /**\r\n   * Superclass of any dependency that needs to be loaded into memory,\r\n   * transformed, and then eval'd (goog.modules and transpiled files).\r\n   *\r\n   * @param {string} path Absolute path of this script.\r\n   * @param {string} relativePath Path of this script relative to goog.basePath.\r\n   * @param {!Array<string>} provides goog.provided or goog.module symbols\r\n   *     in this file.\r\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\r\n   *     this depends on.\r\n   * @param {!Object<string, string>} loadFlags\r\n   * @struct @constructor @abstract\r\n   * @extends {goog.Dependency}\r\n   */\r\n  goog.TransformedDependency = function(\r\n      path, relativePath, provides, requires, loadFlags) {\r\n    goog.TransformedDependency.base(\r\n        this, 'constructor', path, relativePath, provides, requires, loadFlags);\r\n    /** @private {?string} */\r\n    this.contents_ = null;\r\n\r\n    /**\r\n     * Whether to lazily make the synchronous XHR (when goog.require'd) or make\r\n     * the synchronous XHR when initially loading. On FireFox 61 there is a bug\r\n     * where an ES6 module cannot make a synchronous XHR (rather, it can, but if\r\n     * it does then no other ES6 modules will load after).\r\n     *\r\n     * tl;dr we lazy load due to bugs on older browsers and eager load due to\r\n     * bugs on newer ones.\r\n     *\r\n     * https://bugzilla.mozilla.org/show_bug.cgi?id=1477090\r\n     *\r\n     * @private @const {boolean}\r\n     */\r\n    this.lazyFetch_ = !goog.inHtmlDocument_() ||\r\n        !('noModule' in goog.global.document.createElement('script'));\r\n  };\r\n  goog.inherits(goog.TransformedDependency, goog.Dependency);\r\n\r\n\r\n  /** @override */\r\n  goog.TransformedDependency.prototype.load = function(controller) {\r\n    var dep = this;\r\n\r\n    function fetch() {\r\n      dep.contents_ = goog.loadFileSync_(dep.path);\r\n\r\n      if (dep.contents_) {\r\n        dep.contents_ = dep.transform(dep.contents_);\r\n        if (dep.contents_) {\r\n          dep.contents_ += '\\n//# sourceURL=' + dep.path;\r\n        }\r\n      }\r\n    }\r\n\r\n    if (goog.global.CLOSURE_IMPORT_SCRIPT) {\r\n      fetch();\r\n      if (this.contents_ &&\r\n          goog.global.CLOSURE_IMPORT_SCRIPT('', this.contents_)) {\r\n        this.contents_ = null;\r\n        controller.loaded();\r\n      } else {\r\n        controller.pause();\r\n      }\r\n      return;\r\n    }\r\n\r\n\r\n    var isEs6 = this.loadFlags['module'] == goog.ModuleType.ES6;\r\n\r\n    if (!this.lazyFetch_) {\r\n      fetch();\r\n    }\r\n\r\n    function load() {\r\n      if (dep.lazyFetch_) {\r\n        fetch();\r\n      }\r\n\r\n      if (!dep.contents_) {\r\n        // loadFileSync_ or transform are responsible. Assume they logged an\r\n        // error.\r\n        return;\r\n      }\r\n\r\n      if (isEs6) {\r\n        controller.setModuleState(goog.ModuleType.ES6);\r\n      }\r\n\r\n      var namespace;\r\n\r\n      try {\r\n        var contents = dep.contents_;\r\n        dep.contents_ = null;\r\n        goog.globalEval(contents);\r\n        if (isEs6) {\r\n          namespace = goog.moduleLoaderState_.moduleName;\r\n        }\r\n      } finally {\r\n        if (isEs6) {\r\n          controller.clearModuleState();\r\n        }\r\n      }\r\n\r\n      if (isEs6) {\r\n        // Due to circular dependencies this may not be available for require\r\n        // right now.\r\n        goog.global['$jscomp']['require']['ensure'](\r\n            [dep.getPathName()], function() {\r\n              controller.registerEs6ModuleExports(\r\n                  dep.path,\r\n                  goog.global['$jscomp']['require'](dep.getPathName()),\r\n                  namespace);\r\n            });\r\n      }\r\n\r\n      controller.loaded();\r\n    }\r\n\r\n    // Do not fetch now; in FireFox 47 the synchronous XHR doesn't block all\r\n    // events. If we fetched now and then document.write'd the contents the\r\n    // document.write would be an eval and would execute too soon! Instead write\r\n    // a script tag to fetch and eval synchronously at the correct time.\r\n    function fetchInOwnScriptThenLoad() {\r\n      /** @type {!HTMLDocument} */\r\n      var doc = goog.global.document;\r\n\r\n      var key = goog.Dependency.registerCallback_(function() {\r\n        goog.Dependency.unregisterCallback_(key);\r\n        load();\r\n      });\r\n\r\n      var script = '<script type=\"text/javascript\">' +\r\n          goog.protectScriptTag_('goog.Dependency.callback_(\"' + key + '\");') +\r\n          '</' +\r\n          'script>';\r\n      doc.write(\r\n          goog.TRUSTED_TYPES_POLICY_ ?\r\n              goog.TRUSTED_TYPES_POLICY_.createHTML(script) :\r\n              script);\r\n    }\r\n\r\n    // If one thing is pending it is this.\r\n    var anythingElsePending = controller.pending().length > 1;\r\n\r\n    // If anything else is loading we need to lazy load due to bugs in old IE.\r\n    // Specifically script tags with src and script tags with contents could\r\n    // execute out of order if document.write is used, so we cannot use\r\n    // document.write. Do not pause here; it breaks old IE as well.\r\n    var useOldIeWorkAround =\r\n        anythingElsePending && goog.DebugLoader_.IS_OLD_IE_;\r\n\r\n    // Additionally if we are meant to defer scripts but the page is still\r\n    // loading (e.g. an ES6 module is loading) then also defer. Or if we are\r\n    // meant to defer and anything else is pending then defer (those may be\r\n    // scripts that did not need transformation and are just script tags with\r\n    // defer set to true, and we need to evaluate after that deferred script).\r\n    var needsAsyncLoading = goog.Dependency.defer_ &&\r\n        (anythingElsePending || goog.isDocumentLoading_());\r\n\r\n    if (useOldIeWorkAround || needsAsyncLoading) {\r\n      // Note that we only defer when we have to rather than 100% of the time.\r\n      // Always defering would work, but then in theory the order of\r\n      // goog.require calls would then matter. We want to enforce that most of\r\n      // the time the order of the require calls does not matter.\r\n      controller.defer(function() {\r\n        load();\r\n      });\r\n      return;\r\n    }\r\n    // TODO(johnplaisted): Externs are missing onreadystatechange for\r\n    // HTMLDocument.\r\n    /** @type {?} */\r\n    var doc = goog.global.document;\r\n\r\n    var isInternetExplorer =\r\n        goog.inHtmlDocument_() && 'ActiveXObject' in goog.global;\r\n\r\n    // Don't delay in any version of IE. There's bug around this that will\r\n    // cause out of order script execution. This means that on older IE ES6\r\n    // modules will load too early (while the document is still loading + the\r\n    // dom is not available). The other option is to load too late (when the\r\n    // document is complete and the onload even will never fire). This seems\r\n    // to be the lesser of two evils as scripts already act like the former.\r\n    if (isEs6 && goog.inHtmlDocument_() && goog.isDocumentLoading_() &&\r\n        !isInternetExplorer) {\r\n      goog.Dependency.defer_ = true;\r\n      // Transpiled ES6 modules still need to load like regular ES6 modules,\r\n      // aka only after the document is interactive.\r\n      controller.pause();\r\n      var oldCallback = doc.onreadystatechange;\r\n      doc.onreadystatechange = function() {\r\n        if (doc.readyState == 'interactive') {\r\n          doc.onreadystatechange = oldCallback;\r\n          load();\r\n          controller.resume();\r\n        }\r\n        if (goog.isFunction(oldCallback)) {\r\n          oldCallback.apply(undefined, arguments);\r\n        }\r\n      };\r\n    } else {\r\n      // Always eval on old IE.\r\n      if (goog.DebugLoader_.IS_OLD_IE_ || !goog.inHtmlDocument_() ||\r\n          !goog.isDocumentLoading_()) {\r\n        load();\r\n      } else {\r\n        fetchInOwnScriptThenLoad();\r\n      }\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * @param {string} contents\r\n   * @return {string}\r\n   * @abstract\r\n   */\r\n  goog.TransformedDependency.prototype.transform = function(contents) {};\r\n\r\n\r\n  /**\r\n   * Any non-goog.module dependency which needs to be transpiled before eval.\r\n   *\r\n   * @param {string} path Absolute path of this script.\r\n   * @param {string} relativePath Path of this script relative to goog.basePath.\r\n   * @param {!Array<string>} provides goog.provided or goog.module symbols\r\n   *     in this file.\r\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\r\n   *     this depends on.\r\n   * @param {!Object<string, string>} loadFlags\r\n   * @param {!goog.Transpiler} transpiler\r\n   * @struct @constructor\r\n   * @extends {goog.TransformedDependency}\r\n   */\r\n  goog.TranspiledDependency = function(\r\n      path, relativePath, provides, requires, loadFlags, transpiler) {\r\n    goog.TranspiledDependency.base(\r\n        this, 'constructor', path, relativePath, provides, requires, loadFlags);\r\n    /** @protected @const*/\r\n    this.transpiler = transpiler;\r\n  };\r\n  goog.inherits(goog.TranspiledDependency, goog.TransformedDependency);\r\n\r\n\r\n  /** @override */\r\n  goog.TranspiledDependency.prototype.transform = function(contents) {\r\n    // Transpile with the pathname so that ES6 modules are domain agnostic.\r\n    return this.transpiler.transpile(contents, this.getPathName());\r\n  };\r\n\r\n\r\n  /**\r\n   * An ES6 module dependency that was transpiled to a jscomp module outside\r\n   * of the debug loader, e.g. server side.\r\n   *\r\n   * @param {string} path Absolute path of this script.\r\n   * @param {string} relativePath Path of this script relative to goog.basePath.\r\n   * @param {!Array<string>} provides goog.provided or goog.module symbols\r\n   *     in this file.\r\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\r\n   *     this depends on.\r\n   * @param {!Object<string, string>} loadFlags\r\n   * @struct @constructor\r\n   * @extends {goog.TransformedDependency}\r\n   */\r\n  goog.PreTranspiledEs6ModuleDependency = function(\r\n      path, relativePath, provides, requires, loadFlags) {\r\n    goog.PreTranspiledEs6ModuleDependency.base(\r\n        this, 'constructor', path, relativePath, provides, requires, loadFlags);\r\n  };\r\n  goog.inherits(\r\n      goog.PreTranspiledEs6ModuleDependency, goog.TransformedDependency);\r\n\r\n\r\n  /** @override */\r\n  goog.PreTranspiledEs6ModuleDependency.prototype.transform = function(\r\n      contents) {\r\n    return contents;\r\n  };\r\n\r\n\r\n  /**\r\n   * A goog.module, transpiled or not. Will always perform some minimal\r\n   * transformation even when not transpiled to wrap in a goog.loadModule\r\n   * statement.\r\n   *\r\n   * @param {string} path Absolute path of this script.\r\n   * @param {string} relativePath Path of this script relative to goog.basePath.\r\n   * @param {!Array<string>} provides goog.provided or goog.module symbols\r\n   *     in this file.\r\n   * @param {!Array<string>} requires goog symbols or relative paths to Closure\r\n   *     this depends on.\r\n   * @param {!Object<string, string>} loadFlags\r\n   * @param {boolean} needsTranspile\r\n   * @param {!goog.Transpiler} transpiler\r\n   * @struct @constructor\r\n   * @extends {goog.TransformedDependency}\r\n   */\r\n  goog.GoogModuleDependency = function(\r\n      path, relativePath, provides, requires, loadFlags, needsTranspile,\r\n      transpiler) {\r\n    goog.GoogModuleDependency.base(\r\n        this, 'constructor', path, relativePath, provides, requires, loadFlags);\r\n    /** @private @const */\r\n    this.needsTranspile_ = needsTranspile;\r\n    /** @private @const */\r\n    this.transpiler_ = transpiler;\r\n  };\r\n  goog.inherits(goog.GoogModuleDependency, goog.TransformedDependency);\r\n\r\n\r\n  /** @override */\r\n  goog.GoogModuleDependency.prototype.transform = function(contents) {\r\n    if (this.needsTranspile_) {\r\n      contents = this.transpiler_.transpile(contents, this.getPathName());\r\n    }\r\n\r\n    if (!goog.LOAD_MODULE_USING_EVAL || !goog.isDef(goog.global.JSON)) {\r\n      return '' +\r\n          'goog.loadModule(function(exports) {' +\r\n          '\"use strict\";' + contents +\r\n          '\\n' +  // terminate any trailing single line comment.\r\n          ';return exports' +\r\n          '});' +\r\n          '\\n//# sourceURL=' + this.path + '\\n';\r\n    } else {\r\n      return '' +\r\n          'goog.loadModule(' +\r\n          goog.global.JSON.stringify(\r\n              contents + '\\n//# sourceURL=' + this.path + '\\n') +\r\n          ');';\r\n    }\r\n  };\r\n\r\n\r\n  /**\r\n   * Whether the browser is IE9 or earlier, which needs special handling\r\n   * for deferred modules.\r\n   * @const @private {boolean}\r\n   */\r\n  goog.DebugLoader_.IS_OLD_IE_ = !!(\r\n      !goog.global.atob && goog.global.document && goog.global.document['all']);\r\n\r\n\r\n  /**\r\n   * @param {string} relPath\r\n   * @param {!Array<string>|undefined} provides\r\n   * @param {!Array<string>} requires\r\n   * @param {boolean|!Object<string>=} opt_loadFlags\r\n   * @see goog.addDependency\r\n   */\r\n  goog.DebugLoader_.prototype.addDependency = function(\r\n      relPath, provides, requires, opt_loadFlags) {\r\n    provides = provides || [];\r\n    relPath = relPath.replace(/\\\\/g, '/');\r\n    var path = goog.normalizePath_(goog.basePath + relPath);\r\n    if (!opt_loadFlags || typeof opt_loadFlags === 'boolean') {\r\n      opt_loadFlags = opt_loadFlags ? {'module': goog.ModuleType.GOOG} : {};\r\n    }\r\n    var dep = this.factory_.createDependency(\r\n        path, relPath, provides, requires, opt_loadFlags,\r\n        goog.transpiler_.needsTranspile(\r\n            opt_loadFlags['lang'] || 'es3', opt_loadFlags['module']));\r\n    this.dependencies_[path] = dep;\r\n    for (var i = 0; i < provides.length; i++) {\r\n      this.idToPath_[provides[i]] = path;\r\n    }\r\n    this.idToPath_[relPath] = path;\r\n  };\r\n\r\n\r\n  /**\r\n   * Creates goog.Dependency instances for the debug loader to load.\r\n   *\r\n   * Should be overridden to have the debug loader use custom subclasses of\r\n   * goog.Dependency.\r\n   *\r\n   * @param {!goog.Transpiler} transpiler\r\n   * @struct @constructor\r\n   */\r\n  goog.DependencyFactory = function(transpiler) {\r\n    /** @protected @const */\r\n    this.transpiler = transpiler;\r\n  };\r\n\r\n\r\n  /**\r\n   * @param {string} path Absolute path of the file.\r\n   * @param {string} relativePath Path relative to closure’s base.js.\r\n   * @param {!Array<string>} provides Array of provided goog.provide/module ids.\r\n   * @param {!Array<string>} requires Array of required goog.provide/module /\r\n   *     relative ES6 module paths.\r\n   * @param {!Object<string, string>} loadFlags\r\n   * @param {boolean} needsTranspile True if the file needs to be transpiled\r\n   *     per the goog.Transpiler.\r\n   * @return {!goog.Dependency}\r\n   */\r\n  goog.DependencyFactory.prototype.createDependency = function(\r\n      path, relativePath, provides, requires, loadFlags, needsTranspile) {\r\n\r\n    if (loadFlags['module'] == goog.ModuleType.GOOG) {\r\n      return new goog.GoogModuleDependency(\r\n          path, relativePath, provides, requires, loadFlags, needsTranspile,\r\n          this.transpiler);\r\n    } else if (needsTranspile) {\r\n      return new goog.TranspiledDependency(\r\n          path, relativePath, provides, requires, loadFlags, this.transpiler);\r\n    } else {\r\n      if (loadFlags['module'] == goog.ModuleType.ES6) {\r\n        if (goog.TRANSPILE == 'never' && goog.ASSUME_ES_MODULES_TRANSPILED) {\r\n          return new goog.PreTranspiledEs6ModuleDependency(\r\n              path, relativePath, provides, requires, loadFlags);\r\n        } else {\r\n          return new goog.Es6ModuleDependency(\r\n              path, relativePath, provides, requires, loadFlags);\r\n        }\r\n      } else {\r\n        return new goog.Dependency(\r\n            path, relativePath, provides, requires, loadFlags);\r\n      }\r\n    }\r\n  };\r\n\r\n\r\n  /** @private @const */\r\n  goog.debugLoader_ = new goog.DebugLoader_();\r\n\r\n\r\n  /**\r\n   * Loads the Closure Dependency file.\r\n   *\r\n   * Exposed a public function so CLOSURE_NO_DEPS can be set to false, base\r\n   * loaded, setDependencyFactory called, and then this called. i.e. allows\r\n   * custom loading of the deps file.\r\n   */\r\n  goog.loadClosureDeps = function() {\r\n    goog.debugLoader_.loadClosureDeps();\r\n  };\r\n\r\n\r\n  /**\r\n   * Sets the dependency factory, which can be used to create custom\r\n   * goog.Dependency implementations to control how dependencies are loaded.\r\n   *\r\n   * Note: if you wish to call this function and provide your own implemnetation\r\n   * it is a wise idea to set CLOSURE_NO_DEPS to true, otherwise the dependency\r\n   * file and all of its goog.addDependency calls will use the default factory.\r\n   * You can call goog.loadClosureDeps to load the Closure dependency file\r\n   * later, after your factory is injected.\r\n   *\r\n   * @param {!goog.DependencyFactory} factory\r\n   */\r\n  goog.setDependencyFactory = function(factory) {\r\n    goog.debugLoader_.setDependencyFactory(factory);\r\n  };\r\n\r\n\r\n  if (!goog.global.CLOSURE_NO_DEPS) {\r\n    goog.debugLoader_.loadClosureDeps();\r\n  }\r\n\r\n\r\n  /**\r\n   * Bootstraps the given namespaces and calls the callback once they are\r\n   * available either via goog.require. This is a replacement for using\r\n   * `goog.require` to bootstrap Closure JavaScript. Previously a `goog.require`\r\n   * in an HTML file would guarantee that the require'd namespace was available\r\n   * in the next immediate script tag. With ES6 modules this no longer a\r\n   * guarantee.\r\n   *\r\n   * @param {!Array<string>} namespaces\r\n   * @param {function(): ?} callback Function to call once all the namespaces\r\n   *     have loaded. Always called asynchronously.\r\n   */\r\n  goog.bootstrap = function(namespaces, callback) {\r\n    goog.debugLoader_.bootstrap(namespaces, callback);\r\n  };\r\n}\r\n\r\n\r\n/**\r\n * @define {string} Trusted Types policy name. If non-empty then Closure will\r\n * use Trusted Types.\r\n */\r\ngoog.TRUSTED_TYPES_POLICY_NAME =\r\n    goog.define('goog.TRUSTED_TYPES_POLICY_NAME', '');\r\n\r\n\r\n/**\r\n * Returns the parameter.\r\n * @param {string} s\r\n * @return {string}\r\n * @private\r\n */\r\ngoog.identity_ = function(s) {\r\n  return s;\r\n};\r\n\r\n\r\n/**\r\n * Creates Trusted Types policy if Trusted Types are supported by the browser.\r\n * The policy just blesses any string as a Trusted Type. It is not visibility\r\n * restricted because anyone can also call TrustedTypes.createPolicy directly.\r\n * However, the allowed names should be restricted by a HTTP header and the\r\n * reference to the created policy should be visibility restricted.\r\n * @param {string} name\r\n * @return {?TrustedTypePolicy}\r\n * @throws {!TypeError} If called with a name which is already registered.\r\n */\r\ngoog.createTrustedTypesPolicy = function(name) {\r\n  if (typeof TrustedTypes === 'undefined' || !TrustedTypes.createPolicy) {\r\n    return null;\r\n  }\r\n  return TrustedTypes.createPolicy(name, {\r\n    createHTML: goog.identity_,\r\n    createScript: goog.identity_,\r\n    createScriptURL: goog.identity_,\r\n    createURL: goog.identity_\r\n  });\r\n};\r\n\r\n\r\n/** @private @const {?TrustedTypePolicy} */\r\ngoog.TRUSTED_TYPES_POLICY_ = goog.TRUSTED_TYPES_POLICY_NAME ?\r\n    goog.createTrustedTypesPolicy(goog.TRUSTED_TYPES_POLICY_NAME + '#base') :\r\n    null;\r\n","// Copyright 2005 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Implements the disposable interface. The dispose method is used\r\n * to clean up references and resources.\r\n * @author arv@google.com (Erik Arvidsson)\r\n */\r\n\r\n\r\ngoog.provide('goog.Disposable');\r\ngoog.provide('goog.dispose');\r\ngoog.provide('goog.disposeAll');\r\n\r\ngoog.require('goog.disposable.IDisposable');\r\n\r\n\r\n\r\n/**\r\n * Class that provides the basic implementation for disposable objects. If your\r\n * class holds one or more references to COM objects, DOM nodes, or other\r\n * disposable objects, it should extend this class or implement the disposable\r\n * interface (defined in goog.disposable.IDisposable).\r\n * @constructor\r\n * @implements {goog.disposable.IDisposable}\r\n */\r\ngoog.Disposable = function() {\r\n  /**\r\n   * If monitoring the goog.Disposable instances is enabled, stores the creation\r\n   * stack trace of the Disposable instance.\r\n   * @type {string|undefined}\r\n   */\r\n  this.creationStack;\r\n\r\n  if (goog.Disposable.MONITORING_MODE != goog.Disposable.MonitoringMode.OFF) {\r\n    if (goog.Disposable.INCLUDE_STACK_ON_CREATION) {\r\n      this.creationStack = new Error().stack;\r\n    }\r\n    goog.Disposable.instances_[goog.getUid(this)] = this;\r\n  }\r\n  // Support sealing\r\n  this.disposed_ = this.disposed_;\r\n  this.onDisposeCallbacks_ = this.onDisposeCallbacks_;\r\n};\r\n\r\n\r\n/**\r\n * @enum {number} Different monitoring modes for Disposable.\r\n */\r\ngoog.Disposable.MonitoringMode = {\r\n  /**\r\n   * No monitoring.\r\n   */\r\n  OFF: 0,\r\n  /**\r\n   * Creating and disposing the goog.Disposable instances is monitored. All\r\n   * disposable objects need to call the `goog.Disposable` base\r\n   * constructor. The PERMANENT mode must be switched on before creating any\r\n   * goog.Disposable instances.\r\n   */\r\n  PERMANENT: 1,\r\n  /**\r\n   * INTERACTIVE mode can be switched on and off on the fly without producing\r\n   * errors. It also doesn't warn if the disposable objects don't call the\r\n   * `goog.Disposable` base constructor.\r\n   */\r\n  INTERACTIVE: 2\r\n};\r\n\r\n\r\n/**\r\n * @define {number} The monitoring mode of the goog.Disposable\r\n *     instances. Default is OFF. Switching on the monitoring is only\r\n *     recommended for debugging because it has a significant impact on\r\n *     performance and memory usage. If switched off, the monitoring code\r\n *     compiles down to 0 bytes.\r\n */\r\ngoog.Disposable.MONITORING_MODE =\r\n    goog.define('goog.Disposable.MONITORING_MODE', 0);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether to attach creation stack to each created disposable\r\n *     instance; This is only relevant for when MonitoringMode != OFF.\r\n */\r\ngoog.Disposable.INCLUDE_STACK_ON_CREATION =\r\n    goog.define('goog.Disposable.INCLUDE_STACK_ON_CREATION', true);\r\n\r\n\r\n/**\r\n * Maps the unique ID of every undisposed `goog.Disposable` object to\r\n * the object itself.\r\n * @type {!Object<number, !goog.Disposable>}\r\n * @private\r\n */\r\ngoog.Disposable.instances_ = {};\r\n\r\n\r\n/**\r\n * @return {!Array<!goog.Disposable>} All `goog.Disposable` objects that\r\n *     haven't been disposed of.\r\n */\r\ngoog.Disposable.getUndisposedObjects = function() {\r\n  var ret = [];\r\n  for (var id in goog.Disposable.instances_) {\r\n    if (goog.Disposable.instances_.hasOwnProperty(id)) {\r\n      ret.push(goog.Disposable.instances_[Number(id)]);\r\n    }\r\n  }\r\n  return ret;\r\n};\r\n\r\n\r\n/**\r\n * Clears the registry of undisposed objects but doesn't dispose of them.\r\n */\r\ngoog.Disposable.clearUndisposedObjects = function() {\r\n  goog.Disposable.instances_ = {};\r\n};\r\n\r\n\r\n/**\r\n * Whether the object has been disposed of.\r\n * @type {boolean}\r\n * @private\r\n */\r\ngoog.Disposable.prototype.disposed_ = false;\r\n\r\n\r\n/**\r\n * Callbacks to invoke when this object is disposed.\r\n * @type {Array<!Function>}\r\n * @private\r\n */\r\ngoog.Disposable.prototype.onDisposeCallbacks_;\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the object has been disposed of.\r\n * @override\r\n */\r\ngoog.Disposable.prototype.isDisposed = function() {\r\n  return this.disposed_;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the object has been disposed of.\r\n * @deprecated Use {@link #isDisposed} instead.\r\n */\r\ngoog.Disposable.prototype.getDisposed = goog.Disposable.prototype.isDisposed;\r\n\r\n\r\n/**\r\n * Disposes of the object. If the object hasn't already been disposed of, calls\r\n * {@link #disposeInternal}. Classes that extend `goog.Disposable` should\r\n * override {@link #disposeInternal} in order to delete references to COM\r\n * objects, DOM nodes, and other disposable objects. Reentrant.\r\n *\r\n * @return {void} Nothing.\r\n * @override\r\n */\r\ngoog.Disposable.prototype.dispose = function() {\r\n  if (!this.disposed_) {\r\n    // Set disposed_ to true first, in case during the chain of disposal this\r\n    // gets disposed recursively.\r\n    this.disposed_ = true;\r\n    this.disposeInternal();\r\n    if (goog.Disposable.MONITORING_MODE != goog.Disposable.MonitoringMode.OFF) {\r\n      var uid = goog.getUid(this);\r\n      if (goog.Disposable.MONITORING_MODE ==\r\n              goog.Disposable.MonitoringMode.PERMANENT &&\r\n          !goog.Disposable.instances_.hasOwnProperty(uid)) {\r\n        throw new Error(\r\n            this + ' did not call the goog.Disposable base ' +\r\n            'constructor or was disposed of after a clearUndisposedObjects ' +\r\n            'call');\r\n      }\r\n      if (goog.Disposable.MONITORING_MODE !=\r\n              goog.Disposable.MonitoringMode.OFF &&\r\n          this.onDisposeCallbacks_ && this.onDisposeCallbacks_.length > 0) {\r\n        throw new Error(\r\n            this + ' did not empty its onDisposeCallbacks queue. This ' +\r\n            'probably means it overrode dispose() or disposeInternal() ' +\r\n            'without calling the superclass\\' method.');\r\n      }\r\n      delete goog.Disposable.instances_[uid];\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Associates a disposable object with this object so that they will be disposed\r\n * together.\r\n * @param {goog.disposable.IDisposable} disposable that will be disposed when\r\n *     this object is disposed.\r\n */\r\ngoog.Disposable.prototype.registerDisposable = function(disposable) {\r\n  this.addOnDisposeCallback(goog.partial(goog.dispose, disposable));\r\n};\r\n\r\n\r\n/**\r\n * Invokes a callback function when this object is disposed. Callbacks are\r\n * invoked in the order in which they were added. If a callback is added to\r\n * an already disposed Disposable, it will be called immediately.\r\n * @param {function(this:T):?} callback The callback function.\r\n * @param {T=} opt_scope An optional scope to call the callback in.\r\n * @template T\r\n */\r\ngoog.Disposable.prototype.addOnDisposeCallback = function(callback, opt_scope) {\r\n  if (this.disposed_) {\r\n    goog.isDef(opt_scope) ? callback.call(opt_scope) : callback();\r\n    return;\r\n  }\r\n  if (!this.onDisposeCallbacks_) {\r\n    this.onDisposeCallbacks_ = [];\r\n  }\r\n\r\n  this.onDisposeCallbacks_.push(\r\n      goog.isDef(opt_scope) ? goog.bind(callback, opt_scope) : callback);\r\n};\r\n\r\n\r\n/**\r\n * Deletes or nulls out any references to COM objects, DOM nodes, or other\r\n * disposable objects. Classes that extend `goog.Disposable` should\r\n * override this method.\r\n * Not reentrant. To avoid calling it twice, it must only be called from the\r\n * subclass' `disposeInternal` method. Everywhere else the public\r\n * `dispose` method must be used.\r\n * For example:\r\n * <pre>\r\n *   mypackage.MyClass = function() {\r\n *     mypackage.MyClass.base(this, 'constructor');\r\n *     // Constructor logic specific to MyClass.\r\n *     ...\r\n *   };\r\n *   goog.inherits(mypackage.MyClass, goog.Disposable);\r\n *\r\n *   mypackage.MyClass.prototype.disposeInternal = function() {\r\n *     // Dispose logic specific to MyClass.\r\n *     ...\r\n *     // Call superclass's disposeInternal at the end of the subclass's, like\r\n *     // in C++, to avoid hard-to-catch issues.\r\n *     mypackage.MyClass.base(this, 'disposeInternal');\r\n *   };\r\n * </pre>\r\n * @protected\r\n */\r\ngoog.Disposable.prototype.disposeInternal = function() {\r\n  if (this.onDisposeCallbacks_) {\r\n    while (this.onDisposeCallbacks_.length) {\r\n      this.onDisposeCallbacks_.shift()();\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Returns True if we can verify the object is disposed.\r\n * Calls `isDisposed` on the argument if it supports it.  If obj\r\n * is not an object with an isDisposed() method, return false.\r\n * @param {*} obj The object to investigate.\r\n * @return {boolean} True if we can verify the object is disposed.\r\n */\r\ngoog.Disposable.isDisposed = function(obj) {\r\n  if (obj && typeof obj.isDisposed == 'function') {\r\n    return obj.isDisposed();\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Calls `dispose` on the argument if it supports it. If obj is not an\r\n *     object with a dispose() method, this is a no-op.\r\n * @param {*} obj The object to dispose of.\r\n */\r\ngoog.dispose = function(obj) {\r\n  if (obj && typeof obj.dispose == 'function') {\r\n    obj.dispose();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Calls `dispose` on each member of the list that supports it. (If the\r\n * member is an ArrayLike, then `goog.disposeAll()` will be called\r\n * recursively on each of its members.) If the member is not an object with a\r\n * `dispose()` method, then it is ignored.\r\n * @param {...*} var_args The list.\r\n */\r\ngoog.disposeAll = function(var_args) {\r\n  for (var i = 0, len = arguments.length; i < len; ++i) {\r\n    var disposable = arguments[i];\r\n    if (goog.isArrayLike(disposable)) {\r\n      goog.disposeAll.apply(null, disposable);\r\n    } else {\r\n      goog.dispose(disposable);\r\n    }\r\n  }\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Utilities for manipulating arrays.\r\n *\r\n * @author arv@google.com (Erik Arvidsson)\r\n */\r\n\r\n\r\ngoog.provide('goog.array');\r\n\r\ngoog.require('goog.asserts');\r\n\r\n\r\n/**\r\n * @define {boolean} NATIVE_ARRAY_PROTOTYPES indicates whether the code should\r\n * rely on Array.prototype functions, if available.\r\n *\r\n * The Array.prototype functions can be defined by external libraries like\r\n * Prototype and setting this flag to false forces closure to use its own\r\n * goog.array implementation.\r\n *\r\n * If your javascript can be loaded by a third party site and you are wary about\r\n * relying on the prototype functions, specify\r\n * \"--define goog.NATIVE_ARRAY_PROTOTYPES=false\" to the JSCompiler.\r\n *\r\n * Setting goog.TRUSTED_SITE to false will automatically set\r\n * NATIVE_ARRAY_PROTOTYPES to false.\r\n */\r\ngoog.NATIVE_ARRAY_PROTOTYPES =\r\n    goog.define('goog.NATIVE_ARRAY_PROTOTYPES', goog.TRUSTED_SITE);\r\n\r\n\r\n/**\r\n * @define {boolean} If true, JSCompiler will use the native implementation of\r\n * array functions where appropriate (e.g., `Array#filter`) and remove the\r\n * unused pure JS implementation.\r\n */\r\ngoog.array.ASSUME_NATIVE_FUNCTIONS =\r\n    goog.define('goog.array.ASSUME_NATIVE_FUNCTIONS', false);\r\n\r\n\r\n/**\r\n * Returns the last element in an array without removing it.\r\n * Same as goog.array.last.\r\n * @param {IArrayLike<T>|string} array The array.\r\n * @return {T} Last item in array.\r\n * @template T\r\n */\r\ngoog.array.peek = function(array) {\r\n  return array[array.length - 1];\r\n};\r\n\r\n\r\n/**\r\n * Returns the last element in an array without removing it.\r\n * Same as goog.array.peek.\r\n * @param {IArrayLike<T>|string} array The array.\r\n * @return {T} Last item in array.\r\n * @template T\r\n */\r\ngoog.array.last = goog.array.peek;\r\n\r\n// NOTE(arv): Since most of the array functions are generic it allows you to\r\n// pass an array-like object. Strings have a length and are considered array-\r\n// like. However, the 'in' operator does not work on strings so we cannot just\r\n// use the array path even if the browser supports indexing into strings. We\r\n// therefore end up splitting the string.\r\n\r\n\r\n/**\r\n * Returns the index of the first element of an array with a specified value, or\r\n * -1 if the element is not present in the array.\r\n *\r\n * See {@link http://tinyurl.com/developer-mozilla-org-array-indexof}\r\n *\r\n * @param {IArrayLike<T>|string} arr The array to be searched.\r\n * @param {T} obj The object for which we are searching.\r\n * @param {number=} opt_fromIndex The index at which to start the search. If\r\n *     omitted the search starts at index 0.\r\n * @return {number} The index of the first matching array element.\r\n * @template T\r\n */\r\ngoog.array.indexOf = goog.NATIVE_ARRAY_PROTOTYPES &&\r\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.indexOf) ?\r\n    function(arr, obj, opt_fromIndex) {\r\n      goog.asserts.assert(arr.length != null);\r\n\r\n      return Array.prototype.indexOf.call(arr, obj, opt_fromIndex);\r\n    } :\r\n    function(arr, obj, opt_fromIndex) {\r\n      var fromIndex = opt_fromIndex == null ?\r\n          0 :\r\n          (opt_fromIndex < 0 ? Math.max(0, arr.length + opt_fromIndex) :\r\n                               opt_fromIndex);\r\n\r\n      if (goog.isString(arr)) {\r\n        // Array.prototype.indexOf uses === so only strings should be found.\r\n        if (!goog.isString(obj) || obj.length != 1) {\r\n          return -1;\r\n        }\r\n        return arr.indexOf(obj, fromIndex);\r\n      }\r\n\r\n      for (var i = fromIndex; i < arr.length; i++) {\r\n        if (i in arr && arr[i] === obj) return i;\r\n      }\r\n      return -1;\r\n    };\r\n\r\n\r\n/**\r\n * Returns the index of the last element of an array with a specified value, or\r\n * -1 if the element is not present in the array.\r\n *\r\n * See {@link http://tinyurl.com/developer-mozilla-org-array-lastindexof}\r\n *\r\n * @param {!IArrayLike<T>|string} arr The array to be searched.\r\n * @param {T} obj The object for which we are searching.\r\n * @param {?number=} opt_fromIndex The index at which to start the search. If\r\n *     omitted the search starts at the end of the array.\r\n * @return {number} The index of the last matching array element.\r\n * @template T\r\n */\r\ngoog.array.lastIndexOf = goog.NATIVE_ARRAY_PROTOTYPES &&\r\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.lastIndexOf) ?\r\n    function(arr, obj, opt_fromIndex) {\r\n      goog.asserts.assert(arr.length != null);\r\n\r\n      // Firefox treats undefined and null as 0 in the fromIndex argument which\r\n      // leads it to always return -1\r\n      var fromIndex = opt_fromIndex == null ? arr.length - 1 : opt_fromIndex;\r\n      return Array.prototype.lastIndexOf.call(arr, obj, fromIndex);\r\n    } :\r\n    function(arr, obj, opt_fromIndex) {\r\n      var fromIndex = opt_fromIndex == null ? arr.length - 1 : opt_fromIndex;\r\n\r\n      if (fromIndex < 0) {\r\n        fromIndex = Math.max(0, arr.length + fromIndex);\r\n      }\r\n\r\n      if (goog.isString(arr)) {\r\n        // Array.prototype.lastIndexOf uses === so only strings should be found.\r\n        if (!goog.isString(obj) || obj.length != 1) {\r\n          return -1;\r\n        }\r\n        return arr.lastIndexOf(obj, fromIndex);\r\n      }\r\n\r\n      for (var i = fromIndex; i >= 0; i--) {\r\n        if (i in arr && arr[i] === obj) return i;\r\n      }\r\n      return -1;\r\n    };\r\n\r\n\r\n/**\r\n * Calls a function for each element in an array. Skips holes in the array.\r\n * See {@link http://tinyurl.com/developer-mozilla-org-array-foreach}\r\n *\r\n * @param {IArrayLike<T>|string} arr Array or array like object over\r\n *     which to iterate.\r\n * @param {?function(this: S, T, number, ?): ?} f The function to call for every\r\n *     element. This function takes 3 arguments (the element, the index and the\r\n *     array). The return value is ignored.\r\n * @param {S=} opt_obj The object to be used as the value of 'this' within f.\r\n * @template T,S\r\n */\r\ngoog.array.forEach = goog.NATIVE_ARRAY_PROTOTYPES &&\r\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.forEach) ?\r\n    function(arr, f, opt_obj) {\r\n      goog.asserts.assert(arr.length != null);\r\n\r\n      Array.prototype.forEach.call(arr, f, opt_obj);\r\n    } :\r\n    function(arr, f, opt_obj) {\r\n      var l = arr.length;  // must be fixed during loop... see docs\r\n      var arr2 = goog.isString(arr) ? arr.split('') : arr;\r\n      for (var i = 0; i < l; i++) {\r\n        if (i in arr2) {\r\n          f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);\r\n        }\r\n      }\r\n    };\r\n\r\n\r\n/**\r\n * Calls a function for each element in an array, starting from the last\r\n * element rather than the first.\r\n *\r\n * @param {IArrayLike<T>|string} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this: S, T, number, ?): ?} f The function to call for every\r\n *     element. This function\r\n *     takes 3 arguments (the element, the index and the array). The return\r\n *     value is ignored.\r\n * @param {S=} opt_obj The object to be used as the value of 'this'\r\n *     within f.\r\n * @template T,S\r\n */\r\ngoog.array.forEachRight = function(arr, f, opt_obj) {\r\n  var l = arr.length;  // must be fixed during loop... see docs\r\n  var arr2 = goog.isString(arr) ? arr.split('') : arr;\r\n  for (var i = l - 1; i >= 0; --i) {\r\n    if (i in arr2) {\r\n      f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Calls a function for each element in an array, and if the function returns\r\n * true adds the element to a new array.\r\n *\r\n * See {@link http://tinyurl.com/developer-mozilla-org-array-filter}\r\n *\r\n * @param {IArrayLike<T>|string} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this:S, T, number, ?):boolean} f The function to call for\r\n *     every element. This function\r\n *     takes 3 arguments (the element, the index and the array) and must\r\n *     return a Boolean. If the return value is true the element is added to the\r\n *     result array. If it is false the element is not included.\r\n * @param {S=} opt_obj The object to be used as the value of 'this'\r\n *     within f.\r\n * @return {!Array<T>} a new array in which only elements that passed the test\r\n *     are present.\r\n * @template T,S\r\n */\r\ngoog.array.filter = goog.NATIVE_ARRAY_PROTOTYPES &&\r\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.filter) ?\r\n    function(arr, f, opt_obj) {\r\n      goog.asserts.assert(arr.length != null);\r\n\r\n      return Array.prototype.filter.call(arr, f, opt_obj);\r\n    } :\r\n    function(arr, f, opt_obj) {\r\n      var l = arr.length;  // must be fixed during loop... see docs\r\n      var res = [];\r\n      var resLength = 0;\r\n      var arr2 = goog.isString(arr) ? arr.split('') : arr;\r\n      for (var i = 0; i < l; i++) {\r\n        if (i in arr2) {\r\n          var val = arr2[i];  // in case f mutates arr2\r\n          if (f.call(/** @type {?} */ (opt_obj), val, i, arr)) {\r\n            res[resLength++] = val;\r\n          }\r\n        }\r\n      }\r\n      return res;\r\n    };\r\n\r\n\r\n/**\r\n * Calls a function for each element in an array and inserts the result into a\r\n * new array.\r\n *\r\n * See {@link http://tinyurl.com/developer-mozilla-org-array-map}\r\n *\r\n * @param {IArrayLike<VALUE>|string} arr Array or array like object\r\n *     over which to iterate.\r\n * @param {function(this:THIS, VALUE, number, ?): RESULT} f The function to call\r\n *     for every element. This function takes 3 arguments (the element,\r\n *     the index and the array) and should return something. The result will be\r\n *     inserted into a new array.\r\n * @param {THIS=} opt_obj The object to be used as the value of 'this' within f.\r\n * @return {!Array<RESULT>} a new array with the results from f.\r\n * @template THIS, VALUE, RESULT\r\n */\r\ngoog.array.map = goog.NATIVE_ARRAY_PROTOTYPES &&\r\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.map) ?\r\n    function(arr, f, opt_obj) {\r\n      goog.asserts.assert(arr.length != null);\r\n\r\n      return Array.prototype.map.call(arr, f, opt_obj);\r\n    } :\r\n    function(arr, f, opt_obj) {\r\n      var l = arr.length;  // must be fixed during loop... see docs\r\n      var res = new Array(l);\r\n      var arr2 = goog.isString(arr) ? arr.split('') : arr;\r\n      for (var i = 0; i < l; i++) {\r\n        if (i in arr2) {\r\n          res[i] = f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr);\r\n        }\r\n      }\r\n      return res;\r\n    };\r\n\r\n\r\n/**\r\n * Passes every element of an array into a function and accumulates the result.\r\n *\r\n * See {@link http://tinyurl.com/developer-mozilla-org-array-reduce}\r\n *\r\n * For example:\r\n * var a = [1, 2, 3, 4];\r\n * goog.array.reduce(a, function(r, v, i, arr) {return r + v;}, 0);\r\n * returns 10\r\n *\r\n * @param {IArrayLike<T>|string} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {function(this:S, R, T, number, ?) : R} f The function to call for\r\n *     every element. This function\r\n *     takes 4 arguments (the function's previous result or the initial value,\r\n *     the value of the current array element, the current array index, and the\r\n *     array itself)\r\n *     function(previousValue, currentValue, index, array).\r\n * @param {?} val The initial value to pass into the function on the first call.\r\n * @param {S=} opt_obj  The object to be used as the value of 'this'\r\n *     within f.\r\n * @return {R} Result of evaluating f repeatedly across the values of the array.\r\n * @template T,S,R\r\n */\r\ngoog.array.reduce = goog.NATIVE_ARRAY_PROTOTYPES &&\r\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.reduce) ?\r\n    function(arr, f, val, opt_obj) {\r\n      goog.asserts.assert(arr.length != null);\r\n      if (opt_obj) {\r\n        f = goog.bind(f, opt_obj);\r\n      }\r\n      return Array.prototype.reduce.call(arr, f, val);\r\n    } :\r\n    function(arr, f, val, opt_obj) {\r\n      var rval = val;\r\n      goog.array.forEach(arr, function(val, index) {\r\n        rval = f.call(/** @type {?} */ (opt_obj), rval, val, index, arr);\r\n      });\r\n      return rval;\r\n    };\r\n\r\n\r\n/**\r\n * Passes every element of an array into a function and accumulates the result,\r\n * starting from the last element and working towards the first.\r\n *\r\n * See {@link http://tinyurl.com/developer-mozilla-org-array-reduceright}\r\n *\r\n * For example:\r\n * var a = ['a', 'b', 'c'];\r\n * goog.array.reduceRight(a, function(r, v, i, arr) {return r + v;}, '');\r\n * returns 'cba'\r\n *\r\n * @param {IArrayLike<T>|string} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this:S, R, T, number, ?) : R} f The function to call for\r\n *     every element. This function\r\n *     takes 4 arguments (the function's previous result or the initial value,\r\n *     the value of the current array element, the current array index, and the\r\n *     array itself)\r\n *     function(previousValue, currentValue, index, array).\r\n * @param {?} val The initial value to pass into the function on the first call.\r\n * @param {S=} opt_obj The object to be used as the value of 'this'\r\n *     within f.\r\n * @return {R} Object returned as a result of evaluating f repeatedly across the\r\n *     values of the array.\r\n * @template T,S,R\r\n */\r\ngoog.array.reduceRight = goog.NATIVE_ARRAY_PROTOTYPES &&\r\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.reduceRight) ?\r\n    function(arr, f, val, opt_obj) {\r\n      goog.asserts.assert(arr.length != null);\r\n      goog.asserts.assert(f != null);\r\n      if (opt_obj) {\r\n        f = goog.bind(f, opt_obj);\r\n      }\r\n      return Array.prototype.reduceRight.call(arr, f, val);\r\n    } :\r\n    function(arr, f, val, opt_obj) {\r\n      var rval = val;\r\n      goog.array.forEachRight(arr, function(val, index) {\r\n        rval = f.call(/** @type {?} */ (opt_obj), rval, val, index, arr);\r\n      });\r\n      return rval;\r\n    };\r\n\r\n\r\n/**\r\n * Calls f for each element of an array. If any call returns true, some()\r\n * returns true (without checking the remaining elements). If all calls\r\n * return false, some() returns false.\r\n *\r\n * See {@link http://tinyurl.com/developer-mozilla-org-array-some}\r\n *\r\n * @param {IArrayLike<T>|string} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call for\r\n *     for every element. This function takes 3 arguments (the element, the\r\n *     index and the array) and should return a boolean.\r\n * @param {S=} opt_obj  The object to be used as the value of 'this'\r\n *     within f.\r\n * @return {boolean} true if any element passes the test.\r\n * @template T,S\r\n */\r\ngoog.array.some = goog.NATIVE_ARRAY_PROTOTYPES &&\r\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.some) ?\r\n    function(arr, f, opt_obj) {\r\n      goog.asserts.assert(arr.length != null);\r\n\r\n      return Array.prototype.some.call(arr, f, opt_obj);\r\n    } :\r\n    function(arr, f, opt_obj) {\r\n      var l = arr.length;  // must be fixed during loop... see docs\r\n      var arr2 = goog.isString(arr) ? arr.split('') : arr;\r\n      for (var i = 0; i < l; i++) {\r\n        if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {\r\n          return true;\r\n        }\r\n      }\r\n      return false;\r\n    };\r\n\r\n\r\n/**\r\n * Call f for each element of an array. If all calls return true, every()\r\n * returns true. If any call returns false, every() returns false and\r\n * does not continue to check the remaining elements.\r\n *\r\n * See {@link http://tinyurl.com/developer-mozilla-org-array-every}\r\n *\r\n * @param {IArrayLike<T>|string} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call for\r\n *     for every element. This function takes 3 arguments (the element, the\r\n *     index and the array) and should return a boolean.\r\n * @param {S=} opt_obj The object to be used as the value of 'this'\r\n *     within f.\r\n * @return {boolean} false if any element fails the test.\r\n * @template T,S\r\n */\r\ngoog.array.every = goog.NATIVE_ARRAY_PROTOTYPES &&\r\n        (goog.array.ASSUME_NATIVE_FUNCTIONS || Array.prototype.every) ?\r\n    function(arr, f, opt_obj) {\r\n      goog.asserts.assert(arr.length != null);\r\n\r\n      return Array.prototype.every.call(arr, f, opt_obj);\r\n    } :\r\n    function(arr, f, opt_obj) {\r\n      var l = arr.length;  // must be fixed during loop... see docs\r\n      var arr2 = goog.isString(arr) ? arr.split('') : arr;\r\n      for (var i = 0; i < l; i++) {\r\n        if (i in arr2 && !f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {\r\n          return false;\r\n        }\r\n      }\r\n      return true;\r\n    };\r\n\r\n\r\n/**\r\n * Counts the array elements that fulfill the predicate, i.e. for which the\r\n * callback function returns true. Skips holes in the array.\r\n *\r\n * @param {!IArrayLike<T>|string} arr Array or array like object\r\n *     over which to iterate.\r\n * @param {function(this: S, T, number, ?): boolean} f The function to call for\r\n *     every element. Takes 3 arguments (the element, the index and the array).\r\n * @param {S=} opt_obj The object to be used as the value of 'this' within f.\r\n * @return {number} The number of the matching elements.\r\n * @template T,S\r\n */\r\ngoog.array.count = function(arr, f, opt_obj) {\r\n  var count = 0;\r\n  goog.array.forEach(arr, function(element, index, arr) {\r\n    if (f.call(/** @type {?} */ (opt_obj), element, index, arr)) {\r\n      ++count;\r\n    }\r\n  }, opt_obj);\r\n  return count;\r\n};\r\n\r\n\r\n/**\r\n * Search an array for the first element that satisfies a given condition and\r\n * return that element.\r\n * @param {IArrayLike<T>|string} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call\r\n *     for every element. This function takes 3 arguments (the element, the\r\n *     index and the array) and should return a boolean.\r\n * @param {S=} opt_obj An optional \"this\" context for the function.\r\n * @return {T|null} The first array element that passes the test, or null if no\r\n *     element is found.\r\n * @template T,S\r\n */\r\ngoog.array.find = function(arr, f, opt_obj) {\r\n  var i = goog.array.findIndex(arr, f, opt_obj);\r\n  return i < 0 ? null : goog.isString(arr) ? arr.charAt(i) : arr[i];\r\n};\r\n\r\n\r\n/**\r\n * Search an array for the first element that satisfies a given condition and\r\n * return its index.\r\n * @param {IArrayLike<T>|string} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call for\r\n *     every element. This function\r\n *     takes 3 arguments (the element, the index and the array) and should\r\n *     return a boolean.\r\n * @param {S=} opt_obj An optional \"this\" context for the function.\r\n * @return {number} The index of the first array element that passes the test,\r\n *     or -1 if no element is found.\r\n * @template T,S\r\n */\r\ngoog.array.findIndex = function(arr, f, opt_obj) {\r\n  var l = arr.length;  // must be fixed during loop... see docs\r\n  var arr2 = goog.isString(arr) ? arr.split('') : arr;\r\n  for (var i = 0; i < l; i++) {\r\n    if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {\r\n      return i;\r\n    }\r\n  }\r\n  return -1;\r\n};\r\n\r\n\r\n/**\r\n * Search an array (in reverse order) for the last element that satisfies a\r\n * given condition and return that element.\r\n * @param {IArrayLike<T>|string} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call\r\n *     for every element. This function\r\n *     takes 3 arguments (the element, the index and the array) and should\r\n *     return a boolean.\r\n * @param {S=} opt_obj An optional \"this\" context for the function.\r\n * @return {T|null} The last array element that passes the test, or null if no\r\n *     element is found.\r\n * @template T,S\r\n */\r\ngoog.array.findRight = function(arr, f, opt_obj) {\r\n  var i = goog.array.findIndexRight(arr, f, opt_obj);\r\n  return i < 0 ? null : goog.isString(arr) ? arr.charAt(i) : arr[i];\r\n};\r\n\r\n\r\n/**\r\n * Search an array (in reverse order) for the last element that satisfies a\r\n * given condition and return its index.\r\n * @param {IArrayLike<T>|string} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call\r\n *     for every element. This function\r\n *     takes 3 arguments (the element, the index and the array) and should\r\n *     return a boolean.\r\n * @param {S=} opt_obj An optional \"this\" context for the function.\r\n * @return {number} The index of the last array element that passes the test,\r\n *     or -1 if no element is found.\r\n * @template T,S\r\n */\r\ngoog.array.findIndexRight = function(arr, f, opt_obj) {\r\n  var l = arr.length;  // must be fixed during loop... see docs\r\n  var arr2 = goog.isString(arr) ? arr.split('') : arr;\r\n  for (var i = l - 1; i >= 0; i--) {\r\n    if (i in arr2 && f.call(/** @type {?} */ (opt_obj), arr2[i], i, arr)) {\r\n      return i;\r\n    }\r\n  }\r\n  return -1;\r\n};\r\n\r\n\r\n/**\r\n * Whether the array contains the given object.\r\n * @param {IArrayLike<?>|string} arr The array to test for the presence of the\r\n *     element.\r\n * @param {*} obj The object for which to test.\r\n * @return {boolean} true if obj is present.\r\n */\r\ngoog.array.contains = function(arr, obj) {\r\n  return goog.array.indexOf(arr, obj) >= 0;\r\n};\r\n\r\n\r\n/**\r\n * Whether the array is empty.\r\n * @param {IArrayLike<?>|string} arr The array to test.\r\n * @return {boolean} true if empty.\r\n */\r\ngoog.array.isEmpty = function(arr) {\r\n  return arr.length == 0;\r\n};\r\n\r\n\r\n/**\r\n * Clears the array.\r\n * @param {IArrayLike<?>} arr Array or array like object to clear.\r\n */\r\ngoog.array.clear = function(arr) {\r\n  // For non real arrays we don't have the magic length so we delete the\r\n  // indices.\r\n  if (!goog.isArray(arr)) {\r\n    for (var i = arr.length - 1; i >= 0; i--) {\r\n      delete arr[i];\r\n    }\r\n  }\r\n  arr.length = 0;\r\n};\r\n\r\n\r\n/**\r\n * Pushes an item into an array, if it's not already in the array.\r\n * @param {Array<T>} arr Array into which to insert the item.\r\n * @param {T} obj Value to add.\r\n * @template T\r\n */\r\ngoog.array.insert = function(arr, obj) {\r\n  if (!goog.array.contains(arr, obj)) {\r\n    arr.push(obj);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Inserts an object at the given index of the array.\r\n * @param {IArrayLike<?>} arr The array to modify.\r\n * @param {*} obj The object to insert.\r\n * @param {number=} opt_i The index at which to insert the object. If omitted,\r\n *      treated as 0. A negative index is counted from the end of the array.\r\n */\r\ngoog.array.insertAt = function(arr, obj, opt_i) {\r\n  goog.array.splice(arr, opt_i, 0, obj);\r\n};\r\n\r\n\r\n/**\r\n * Inserts at the given index of the array, all elements of another array.\r\n * @param {IArrayLike<?>} arr The array to modify.\r\n * @param {IArrayLike<?>} elementsToAdd The array of elements to add.\r\n * @param {number=} opt_i The index at which to insert the object. If omitted,\r\n *      treated as 0. A negative index is counted from the end of the array.\r\n */\r\ngoog.array.insertArrayAt = function(arr, elementsToAdd, opt_i) {\r\n  goog.partial(goog.array.splice, arr, opt_i, 0).apply(null, elementsToAdd);\r\n};\r\n\r\n\r\n/**\r\n * Inserts an object into an array before a specified object.\r\n * @param {Array<T>} arr The array to modify.\r\n * @param {T} obj The object to insert.\r\n * @param {T=} opt_obj2 The object before which obj should be inserted. If obj2\r\n *     is omitted or not found, obj is inserted at the end of the array.\r\n * @template T\r\n */\r\ngoog.array.insertBefore = function(arr, obj, opt_obj2) {\r\n  var i;\r\n  if (arguments.length == 2 || (i = goog.array.indexOf(arr, opt_obj2)) < 0) {\r\n    arr.push(obj);\r\n  } else {\r\n    goog.array.insertAt(arr, obj, i);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Removes the first occurrence of a particular value from an array.\r\n * @param {IArrayLike<T>} arr Array from which to remove\r\n *     value.\r\n * @param {T} obj Object to remove.\r\n * @return {boolean} True if an element was removed.\r\n * @template T\r\n */\r\ngoog.array.remove = function(arr, obj) {\r\n  var i = goog.array.indexOf(arr, obj);\r\n  var rv;\r\n  if ((rv = i >= 0)) {\r\n    goog.array.removeAt(arr, i);\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Removes the last occurrence of a particular value from an array.\r\n * @param {!IArrayLike<T>} arr Array from which to remove value.\r\n * @param {T} obj Object to remove.\r\n * @return {boolean} True if an element was removed.\r\n * @template T\r\n */\r\ngoog.array.removeLast = function(arr, obj) {\r\n  var i = goog.array.lastIndexOf(arr, obj);\r\n  if (i >= 0) {\r\n    goog.array.removeAt(arr, i);\r\n    return true;\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Removes from an array the element at index i\r\n * @param {IArrayLike<?>} arr Array or array like object from which to\r\n *     remove value.\r\n * @param {number} i The index to remove.\r\n * @return {boolean} True if an element was removed.\r\n */\r\ngoog.array.removeAt = function(arr, i) {\r\n  goog.asserts.assert(arr.length != null);\r\n\r\n  // use generic form of splice\r\n  // splice returns the removed items and if successful the length of that\r\n  // will be 1\r\n  return Array.prototype.splice.call(arr, i, 1).length == 1;\r\n};\r\n\r\n\r\n/**\r\n * Removes the first value that satisfies the given condition.\r\n * @param {IArrayLike<T>} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call\r\n *     for every element. This function\r\n *     takes 3 arguments (the element, the index and the array) and should\r\n *     return a boolean.\r\n * @param {S=} opt_obj An optional \"this\" context for the function.\r\n * @return {boolean} True if an element was removed.\r\n * @template T,S\r\n */\r\ngoog.array.removeIf = function(arr, f, opt_obj) {\r\n  var i = goog.array.findIndex(arr, f, opt_obj);\r\n  if (i >= 0) {\r\n    goog.array.removeAt(arr, i);\r\n    return true;\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Removes all values that satisfy the given condition.\r\n * @param {IArrayLike<T>} arr Array or array\r\n *     like object over which to iterate.\r\n * @param {?function(this:S, T, number, ?) : boolean} f The function to call\r\n *     for every element. This function\r\n *     takes 3 arguments (the element, the index and the array) and should\r\n *     return a boolean.\r\n * @param {S=} opt_obj An optional \"this\" context for the function.\r\n * @return {number} The number of items removed\r\n * @template T,S\r\n */\r\ngoog.array.removeAllIf = function(arr, f, opt_obj) {\r\n  var removedCount = 0;\r\n  goog.array.forEachRight(arr, function(val, index) {\r\n    if (f.call(/** @type {?} */ (opt_obj), val, index, arr)) {\r\n      if (goog.array.removeAt(arr, index)) {\r\n        removedCount++;\r\n      }\r\n    }\r\n  });\r\n  return removedCount;\r\n};\r\n\r\n\r\n/**\r\n * Returns a new array that is the result of joining the arguments.  If arrays\r\n * are passed then their items are added, however, if non-arrays are passed they\r\n * will be added to the return array as is.\r\n *\r\n * Note that ArrayLike objects will be added as is, rather than having their\r\n * items added.\r\n *\r\n * goog.array.concat([1, 2], [3, 4]) -> [1, 2, 3, 4]\r\n * goog.array.concat(0, [1, 2]) -> [0, 1, 2]\r\n * goog.array.concat([1, 2], null) -> [1, 2, null]\r\n *\r\n * There is bug in all current versions of IE (6, 7 and 8) where arrays created\r\n * in an iframe become corrupted soon (not immediately) after the iframe is\r\n * destroyed. This is common if loading data via goog.net.IframeIo, for example.\r\n * This corruption only affects the concat method which will start throwing\r\n * Catastrophic Errors (#-2147418113).\r\n *\r\n * See http://endoflow.com/scratch/corrupted-arrays.html for a test case.\r\n *\r\n * Internally goog.array should use this, so that all methods will continue to\r\n * work on these broken array objects.\r\n *\r\n * @param {...*} var_args Items to concatenate.  Arrays will have each item\r\n *     added, while primitives and objects will be added as is.\r\n * @return {!Array<?>} The new resultant array.\r\n */\r\ngoog.array.concat = function(var_args) {\r\n  return Array.prototype.concat.apply([], arguments);\r\n};\r\n\r\n\r\n/**\r\n * Returns a new array that contains the contents of all the arrays passed.\r\n * @param {...!Array<T>} var_args\r\n * @return {!Array<T>}\r\n * @template T\r\n */\r\ngoog.array.join = function(var_args) {\r\n  return Array.prototype.concat.apply([], arguments);\r\n};\r\n\r\n\r\n/**\r\n * Converts an object to an array.\r\n * @param {IArrayLike<T>|string} object  The object to convert to an\r\n *     array.\r\n * @return {!Array<T>} The object converted into an array. If object has a\r\n *     length property, every property indexed with a non-negative number\r\n *     less than length will be included in the result. If object does not\r\n *     have a length property, an empty array will be returned.\r\n * @template T\r\n */\r\ngoog.array.toArray = function(object) {\r\n  var length = object.length;\r\n\r\n  // If length is not a number the following is false. This case is kept for\r\n  // backwards compatibility since there are callers that pass objects that are\r\n  // not array like.\r\n  if (length > 0) {\r\n    var rv = new Array(length);\r\n    for (var i = 0; i < length; i++) {\r\n      rv[i] = object[i];\r\n    }\r\n    return rv;\r\n  }\r\n  return [];\r\n};\r\n\r\n\r\n/**\r\n * Does a shallow copy of an array.\r\n * @param {IArrayLike<T>|string} arr  Array or array-like object to\r\n *     clone.\r\n * @return {!Array<T>} Clone of the input array.\r\n * @template T\r\n */\r\ngoog.array.clone = goog.array.toArray;\r\n\r\n\r\n/**\r\n * Extends an array with another array, element, or \"array like\" object.\r\n * This function operates 'in-place', it does not create a new Array.\r\n *\r\n * Example:\r\n * var a = [];\r\n * goog.array.extend(a, [0, 1]);\r\n * a; // [0, 1]\r\n * goog.array.extend(a, 2);\r\n * a; // [0, 1, 2]\r\n *\r\n * @param {Array<VALUE>} arr1  The array to modify.\r\n * @param {...(IArrayLike<VALUE>|VALUE)} var_args The elements or arrays of\r\n *     elements to add to arr1.\r\n * @template VALUE\r\n */\r\ngoog.array.extend = function(arr1, var_args) {\r\n  for (var i = 1; i < arguments.length; i++) {\r\n    var arr2 = arguments[i];\r\n    if (goog.isArrayLike(arr2)) {\r\n      var len1 = arr1.length || 0;\r\n      var len2 = arr2.length || 0;\r\n      arr1.length = len1 + len2;\r\n      for (var j = 0; j < len2; j++) {\r\n        arr1[len1 + j] = arr2[j];\r\n      }\r\n    } else {\r\n      arr1.push(arr2);\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Adds or removes elements from an array. This is a generic version of Array\r\n * splice. This means that it might work on other objects similar to arrays,\r\n * such as the arguments object.\r\n *\r\n * @param {IArrayLike<T>} arr The array to modify.\r\n * @param {number|undefined} index The index at which to start changing the\r\n *     array. If not defined, treated as 0.\r\n * @param {number} howMany How many elements to remove (0 means no removal. A\r\n *     value below 0 is treated as zero and so is any other non number. Numbers\r\n *     are floored).\r\n * @param {...T} var_args Optional, additional elements to insert into the\r\n *     array.\r\n * @return {!Array<T>} the removed elements.\r\n * @template T\r\n */\r\ngoog.array.splice = function(arr, index, howMany, var_args) {\r\n  goog.asserts.assert(arr.length != null);\r\n\r\n  return Array.prototype.splice.apply(arr, goog.array.slice(arguments, 1));\r\n};\r\n\r\n\r\n/**\r\n * Returns a new array from a segment of an array. This is a generic version of\r\n * Array slice. This means that it might work on other objects similar to\r\n * arrays, such as the arguments object.\r\n *\r\n * @param {IArrayLike<T>|string} arr The array from\r\n * which to copy a segment.\r\n * @param {number} start The index of the first element to copy.\r\n * @param {number=} opt_end The index after the last element to copy.\r\n * @return {!Array<T>} A new array containing the specified segment of the\r\n *     original array.\r\n * @template T\r\n */\r\ngoog.array.slice = function(arr, start, opt_end) {\r\n  goog.asserts.assert(arr.length != null);\r\n\r\n  // passing 1 arg to slice is not the same as passing 2 where the second is\r\n  // null or undefined (in that case the second argument is treated as 0).\r\n  // we could use slice on the arguments object and then use apply instead of\r\n  // testing the length\r\n  if (arguments.length <= 2) {\r\n    return Array.prototype.slice.call(arr, start);\r\n  } else {\r\n    return Array.prototype.slice.call(arr, start, opt_end);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Removes all duplicates from an array (retaining only the first\r\n * occurrence of each array element).  This function modifies the\r\n * array in place and doesn't change the order of the non-duplicate items.\r\n *\r\n * For objects, duplicates are identified as having the same unique ID as\r\n * defined by {@link goog.getUid}.\r\n *\r\n * Alternatively you can specify a custom hash function that returns a unique\r\n * value for each item in the array it should consider unique.\r\n *\r\n * Runtime: N,\r\n * Worstcase space: 2N (no dupes)\r\n *\r\n * @param {IArrayLike<T>} arr The array from which to remove\r\n *     duplicates.\r\n * @param {Array=} opt_rv An optional array in which to return the results,\r\n *     instead of performing the removal inplace.  If specified, the original\r\n *     array will remain unchanged.\r\n * @param {function(T):string=} opt_hashFn An optional function to use to\r\n *     apply to every item in the array. This function should return a unique\r\n *     value for each item in the array it should consider unique.\r\n * @template T\r\n */\r\ngoog.array.removeDuplicates = function(arr, opt_rv, opt_hashFn) {\r\n  var returnArray = opt_rv || arr;\r\n  var defaultHashFn = function(item) {\r\n    // Prefix each type with a single character representing the type to\r\n    // prevent conflicting keys (e.g. true and 'true').\r\n    return goog.isObject(item) ? 'o' + goog.getUid(item) :\r\n                                 (typeof item).charAt(0) + item;\r\n  };\r\n  var hashFn = opt_hashFn || defaultHashFn;\r\n\r\n  var seen = {}, cursorInsert = 0, cursorRead = 0;\r\n  while (cursorRead < arr.length) {\r\n    var current = arr[cursorRead++];\r\n    var key = hashFn(current);\r\n    if (!Object.prototype.hasOwnProperty.call(seen, key)) {\r\n      seen[key] = true;\r\n      returnArray[cursorInsert++] = current;\r\n    }\r\n  }\r\n  returnArray.length = cursorInsert;\r\n};\r\n\r\n\r\n/**\r\n * Searches the specified array for the specified target using the binary\r\n * search algorithm.  If no opt_compareFn is specified, elements are compared\r\n * using <code>goog.array.defaultCompare</code>, which compares the elements\r\n * using the built in < and > operators.  This will produce the expected\r\n * behavior for homogeneous arrays of String(s) and Number(s). The array\r\n * specified <b>must</b> be sorted in ascending order (as defined by the\r\n * comparison function).  If the array is not sorted, results are undefined.\r\n * If the array contains multiple instances of the specified target value, any\r\n * of these instances may be found.\r\n *\r\n * Runtime: O(log n)\r\n *\r\n * @param {IArrayLike<VALUE>} arr The array to be searched.\r\n * @param {TARGET} target The sought value.\r\n * @param {function(TARGET, VALUE): number=} opt_compareFn Optional comparison\r\n *     function by which the array is ordered. Should take 2 arguments to\r\n *     compare, the target value and an element from your array, and return a\r\n *     negative number, zero, or a positive number depending on whether the\r\n *     first argument is less than, equal to, or greater than the second.\r\n * @return {number} Lowest index of the target value if found, otherwise\r\n *     (-(insertion point) - 1). The insertion point is where the value should\r\n *     be inserted into arr to preserve the sorted property.  Return value >= 0\r\n *     iff target is found.\r\n * @template TARGET, VALUE\r\n */\r\ngoog.array.binarySearch = function(arr, target, opt_compareFn) {\r\n  return goog.array.binarySearch_(\r\n      arr, opt_compareFn || goog.array.defaultCompare, false /* isEvaluator */,\r\n      target);\r\n};\r\n\r\n\r\n/**\r\n * Selects an index in the specified array using the binary search algorithm.\r\n * The evaluator receives an element and determines whether the desired index\r\n * is before, at, or after it.  The evaluator must be consistent (formally,\r\n * goog.array.map(goog.array.map(arr, evaluator, opt_obj), goog.math.sign)\r\n * must be monotonically non-increasing).\r\n *\r\n * Runtime: O(log n)\r\n *\r\n * @param {IArrayLike<VALUE>} arr The array to be searched.\r\n * @param {function(this:THIS, VALUE, number, ?): number} evaluator\r\n *     Evaluator function that receives 3 arguments (the element, the index and\r\n *     the array). Should return a negative number, zero, or a positive number\r\n *     depending on whether the desired index is before, at, or after the\r\n *     element passed to it.\r\n * @param {THIS=} opt_obj The object to be used as the value of 'this'\r\n *     within evaluator.\r\n * @return {number} Index of the leftmost element matched by the evaluator, if\r\n *     such exists; otherwise (-(insertion point) - 1). The insertion point is\r\n *     the index of the first element for which the evaluator returns negative,\r\n *     or arr.length if no such element exists. The return value is non-negative\r\n *     iff a match is found.\r\n * @template THIS, VALUE\r\n */\r\ngoog.array.binarySelect = function(arr, evaluator, opt_obj) {\r\n  return goog.array.binarySearch_(\r\n      arr, evaluator, true /* isEvaluator */, undefined /* opt_target */,\r\n      opt_obj);\r\n};\r\n\r\n\r\n/**\r\n * Implementation of a binary search algorithm which knows how to use both\r\n * comparison functions and evaluators. If an evaluator is provided, will call\r\n * the evaluator with the given optional data object, conforming to the\r\n * interface defined in binarySelect. Otherwise, if a comparison function is\r\n * provided, will call the comparison function against the given data object.\r\n *\r\n * This implementation purposefully does not use goog.bind or goog.partial for\r\n * performance reasons.\r\n *\r\n * Runtime: O(log n)\r\n *\r\n * @param {IArrayLike<?>} arr The array to be searched.\r\n * @param {function(?, ?, ?): number | function(?, ?): number} compareFn\r\n *     Either an evaluator or a comparison function, as defined by binarySearch\r\n *     and binarySelect above.\r\n * @param {boolean} isEvaluator Whether the function is an evaluator or a\r\n *     comparison function.\r\n * @param {?=} opt_target If the function is a comparison function, then\r\n *     this is the target to binary search for.\r\n * @param {Object=} opt_selfObj If the function is an evaluator, this is an\r\n *     optional this object for the evaluator.\r\n * @return {number} Lowest index of the target value if found, otherwise\r\n *     (-(insertion point) - 1). The insertion point is where the value should\r\n *     be inserted into arr to preserve the sorted property.  Return value >= 0\r\n *     iff target is found.\r\n * @private\r\n */\r\ngoog.array.binarySearch_ = function(\r\n    arr, compareFn, isEvaluator, opt_target, opt_selfObj) {\r\n  var left = 0;            // inclusive\r\n  var right = arr.length;  // exclusive\r\n  var found;\r\n  while (left < right) {\r\n    var middle = (left + right) >> 1;\r\n    var compareResult;\r\n    if (isEvaluator) {\r\n      compareResult = compareFn.call(opt_selfObj, arr[middle], middle, arr);\r\n    } else {\r\n      // NOTE(dimvar): To avoid this cast, we'd have to use function overloading\r\n      // for the type of binarySearch_, which the type system can't express yet.\r\n      compareResult = /** @type {function(?, ?): number} */ (compareFn)(\r\n          opt_target, arr[middle]);\r\n    }\r\n    if (compareResult > 0) {\r\n      left = middle + 1;\r\n    } else {\r\n      right = middle;\r\n      // We are looking for the lowest index so we can't return immediately.\r\n      found = !compareResult;\r\n    }\r\n  }\r\n  // left is the index if found, or the insertion point otherwise.\r\n  // ~left is a shorthand for -left - 1.\r\n  return found ? left : ~left;\r\n};\r\n\r\n\r\n/**\r\n * Sorts the specified array into ascending order.  If no opt_compareFn is\r\n * specified, elements are compared using\r\n * <code>goog.array.defaultCompare</code>, which compares the elements using\r\n * the built in < and > operators.  This will produce the expected behavior\r\n * for homogeneous arrays of String(s) and Number(s), unlike the native sort,\r\n * but will give unpredictable results for heterogeneous lists of strings and\r\n * numbers with different numbers of digits.\r\n *\r\n * This sort is not guaranteed to be stable.\r\n *\r\n * Runtime: Same as <code>Array.prototype.sort</code>\r\n *\r\n * @param {Array<T>} arr The array to be sorted.\r\n * @param {?function(T,T):number=} opt_compareFn Optional comparison\r\n *     function by which the\r\n *     array is to be ordered. Should take 2 arguments to compare, and return a\r\n *     negative number, zero, or a positive number depending on whether the\r\n *     first argument is less than, equal to, or greater than the second.\r\n * @template T\r\n */\r\ngoog.array.sort = function(arr, opt_compareFn) {\r\n  // TODO(arv): Update type annotation since null is not accepted.\r\n  arr.sort(opt_compareFn || goog.array.defaultCompare);\r\n};\r\n\r\n\r\n/**\r\n * Sorts the specified array into ascending order in a stable way.  If no\r\n * opt_compareFn is specified, elements are compared using\r\n * <code>goog.array.defaultCompare</code>, which compares the elements using\r\n * the built in < and > operators.  This will produce the expected behavior\r\n * for homogeneous arrays of String(s) and Number(s).\r\n *\r\n * Runtime: Same as <code>Array.prototype.sort</code>, plus an additional\r\n * O(n) overhead of copying the array twice.\r\n *\r\n * @param {Array<T>} arr The array to be sorted.\r\n * @param {?function(T, T): number=} opt_compareFn Optional comparison function\r\n *     by which the array is to be ordered. Should take 2 arguments to compare,\r\n *     and return a negative number, zero, or a positive number depending on\r\n *     whether the first argument is less than, equal to, or greater than the\r\n *     second.\r\n * @template T\r\n */\r\ngoog.array.stableSort = function(arr, opt_compareFn) {\r\n  var compArr = new Array(arr.length);\r\n  for (var i = 0; i < arr.length; i++) {\r\n    compArr[i] = {index: i, value: arr[i]};\r\n  }\r\n  var valueCompareFn = opt_compareFn || goog.array.defaultCompare;\r\n  function stableCompareFn(obj1, obj2) {\r\n    return valueCompareFn(obj1.value, obj2.value) || obj1.index - obj2.index;\r\n  }\r\n  goog.array.sort(compArr, stableCompareFn);\r\n  for (var i = 0; i < arr.length; i++) {\r\n    arr[i] = compArr[i].value;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Sort the specified array into ascending order based on item keys\r\n * returned by the specified key function.\r\n * If no opt_compareFn is specified, the keys are compared in ascending order\r\n * using <code>goog.array.defaultCompare</code>.\r\n *\r\n * Runtime: O(S(f(n)), where S is runtime of <code>goog.array.sort</code>\r\n * and f(n) is runtime of the key function.\r\n *\r\n * @param {Array<T>} arr The array to be sorted.\r\n * @param {function(T): K} keyFn Function taking array element and returning\r\n *     a key used for sorting this element.\r\n * @param {?function(K, K): number=} opt_compareFn Optional comparison function\r\n *     by which the keys are to be ordered. Should take 2 arguments to compare,\r\n *     and return a negative number, zero, or a positive number depending on\r\n *     whether the first argument is less than, equal to, or greater than the\r\n *     second.\r\n * @template T,K\r\n */\r\ngoog.array.sortByKey = function(arr, keyFn, opt_compareFn) {\r\n  var keyCompareFn = opt_compareFn || goog.array.defaultCompare;\r\n  goog.array.sort(\r\n      arr, function(a, b) { return keyCompareFn(keyFn(a), keyFn(b)); });\r\n};\r\n\r\n\r\n/**\r\n * Sorts an array of objects by the specified object key and compare\r\n * function. If no compare function is provided, the key values are\r\n * compared in ascending order using <code>goog.array.defaultCompare</code>.\r\n * This won't work for keys that get renamed by the compiler. So use\r\n * {'foo': 1, 'bar': 2} rather than {foo: 1, bar: 2}.\r\n * @param {Array<Object>} arr An array of objects to sort.\r\n * @param {string} key The object key to sort by.\r\n * @param {Function=} opt_compareFn The function to use to compare key\r\n *     values.\r\n */\r\ngoog.array.sortObjectsByKey = function(arr, key, opt_compareFn) {\r\n  goog.array.sortByKey(arr, function(obj) { return obj[key]; }, opt_compareFn);\r\n};\r\n\r\n\r\n/**\r\n * Tells if the array is sorted.\r\n * @param {!IArrayLike<T>} arr The array.\r\n * @param {?function(T,T):number=} opt_compareFn Function to compare the\r\n *     array elements.\r\n *     Should take 2 arguments to compare, and return a negative number, zero,\r\n *     or a positive number depending on whether the first argument is less\r\n *     than, equal to, or greater than the second.\r\n * @param {boolean=} opt_strict If true no equal elements are allowed.\r\n * @return {boolean} Whether the array is sorted.\r\n * @template T\r\n */\r\ngoog.array.isSorted = function(arr, opt_compareFn, opt_strict) {\r\n  var compare = opt_compareFn || goog.array.defaultCompare;\r\n  for (var i = 1; i < arr.length; i++) {\r\n    var compareResult = compare(arr[i - 1], arr[i]);\r\n    if (compareResult > 0 || compareResult == 0 && opt_strict) {\r\n      return false;\r\n    }\r\n  }\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * Compares two arrays for equality. Two arrays are considered equal if they\r\n * have the same length and their corresponding elements are equal according to\r\n * the comparison function.\r\n *\r\n * @param {IArrayLike<?>} arr1 The first array to compare.\r\n * @param {IArrayLike<?>} arr2 The second array to compare.\r\n * @param {Function=} opt_equalsFn Optional comparison function.\r\n *     Should take 2 arguments to compare, and return true if the arguments\r\n *     are equal. Defaults to {@link goog.array.defaultCompareEquality} which\r\n *     compares the elements using the built-in '===' operator.\r\n * @return {boolean} Whether the two arrays are equal.\r\n */\r\ngoog.array.equals = function(arr1, arr2, opt_equalsFn) {\r\n  if (!goog.isArrayLike(arr1) || !goog.isArrayLike(arr2) ||\r\n      arr1.length != arr2.length) {\r\n    return false;\r\n  }\r\n  var l = arr1.length;\r\n  var equalsFn = opt_equalsFn || goog.array.defaultCompareEquality;\r\n  for (var i = 0; i < l; i++) {\r\n    if (!equalsFn(arr1[i], arr2[i])) {\r\n      return false;\r\n    }\r\n  }\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * 3-way array compare function.\r\n * @param {!IArrayLike<VALUE>} arr1 The first array to\r\n *     compare.\r\n * @param {!IArrayLike<VALUE>} arr2 The second array to\r\n *     compare.\r\n * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison\r\n *     function by which the array is to be ordered. Should take 2 arguments to\r\n *     compare, and return a negative number, zero, or a positive number\r\n *     depending on whether the first argument is less than, equal to, or\r\n *     greater than the second.\r\n * @return {number} Negative number, zero, or a positive number depending on\r\n *     whether the first argument is less than, equal to, or greater than the\r\n *     second.\r\n * @template VALUE\r\n */\r\ngoog.array.compare3 = function(arr1, arr2, opt_compareFn) {\r\n  var compare = opt_compareFn || goog.array.defaultCompare;\r\n  var l = Math.min(arr1.length, arr2.length);\r\n  for (var i = 0; i < l; i++) {\r\n    var result = compare(arr1[i], arr2[i]);\r\n    if (result != 0) {\r\n      return result;\r\n    }\r\n  }\r\n  return goog.array.defaultCompare(arr1.length, arr2.length);\r\n};\r\n\r\n\r\n/**\r\n * Compares its two arguments for order, using the built in < and >\r\n * operators.\r\n * @param {VALUE} a The first object to be compared.\r\n * @param {VALUE} b The second object to be compared.\r\n * @return {number} A negative number, zero, or a positive number as the first\r\n *     argument is less than, equal to, or greater than the second,\r\n *     respectively.\r\n * @template VALUE\r\n */\r\ngoog.array.defaultCompare = function(a, b) {\r\n  return a > b ? 1 : a < b ? -1 : 0;\r\n};\r\n\r\n\r\n/**\r\n * Compares its two arguments for inverse order, using the built in < and >\r\n * operators.\r\n * @param {VALUE} a The first object to be compared.\r\n * @param {VALUE} b The second object to be compared.\r\n * @return {number} A negative number, zero, or a positive number as the first\r\n *     argument is greater than, equal to, or less than the second,\r\n *     respectively.\r\n * @template VALUE\r\n */\r\ngoog.array.inverseDefaultCompare = function(a, b) {\r\n  return -goog.array.defaultCompare(a, b);\r\n};\r\n\r\n\r\n/**\r\n * Compares its two arguments for equality, using the built in === operator.\r\n * @param {*} a The first object to compare.\r\n * @param {*} b The second object to compare.\r\n * @return {boolean} True if the two arguments are equal, false otherwise.\r\n */\r\ngoog.array.defaultCompareEquality = function(a, b) {\r\n  return a === b;\r\n};\r\n\r\n\r\n/**\r\n * Inserts a value into a sorted array. The array is not modified if the\r\n * value is already present.\r\n * @param {IArrayLike<VALUE>} array The array to modify.\r\n * @param {VALUE} value The object to insert.\r\n * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison\r\n *     function by which the array is ordered. Should take 2 arguments to\r\n *     compare, and return a negative number, zero, or a positive number\r\n *     depending on whether the first argument is less than, equal to, or\r\n *     greater than the second.\r\n * @return {boolean} True if an element was inserted.\r\n * @template VALUE\r\n */\r\ngoog.array.binaryInsert = function(array, value, opt_compareFn) {\r\n  var index = goog.array.binarySearch(array, value, opt_compareFn);\r\n  if (index < 0) {\r\n    goog.array.insertAt(array, value, -(index + 1));\r\n    return true;\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Removes a value from a sorted array.\r\n * @param {!IArrayLike<VALUE>} array The array to modify.\r\n * @param {VALUE} value The object to remove.\r\n * @param {function(VALUE, VALUE): number=} opt_compareFn Optional comparison\r\n *     function by which the array is ordered. Should take 2 arguments to\r\n *     compare, and return a negative number, zero, or a positive number\r\n *     depending on whether the first argument is less than, equal to, or\r\n *     greater than the second.\r\n * @return {boolean} True if an element was removed.\r\n * @template VALUE\r\n */\r\ngoog.array.binaryRemove = function(array, value, opt_compareFn) {\r\n  var index = goog.array.binarySearch(array, value, opt_compareFn);\r\n  return (index >= 0) ? goog.array.removeAt(array, index) : false;\r\n};\r\n\r\n\r\n/**\r\n * Splits an array into disjoint buckets according to a splitting function.\r\n * @param {IArrayLike<T>} array The array.\r\n * @param {function(this:S, T, number, !IArrayLike<T>):?} sorter Function to\r\n *     call for every element.  This takes 3 arguments (the element, the index\r\n *     and the array) and must return a valid object key (a string, number,\r\n *     etc), or undefined, if that object should not be placed in a bucket.\r\n * @param {S=} opt_obj The object to be used as the value of 'this' within\r\n *     sorter.\r\n * @return {!Object<!Array<T>>} An object, with keys being all of the unique\r\n *     return values of sorter, and values being arrays containing the items for\r\n *     which the splitter returned that key.\r\n * @template T,S\r\n */\r\ngoog.array.bucket = function(array, sorter, opt_obj) {\r\n  var buckets = {};\r\n\r\n  for (var i = 0; i < array.length; i++) {\r\n    var value = array[i];\r\n    var key = sorter.call(/** @type {?} */ (opt_obj), value, i, array);\r\n    if (goog.isDef(key)) {\r\n      // Push the value to the right bucket, creating it if necessary.\r\n      var bucket = buckets[key] || (buckets[key] = []);\r\n      bucket.push(value);\r\n    }\r\n  }\r\n\r\n  return buckets;\r\n};\r\n\r\n\r\n/**\r\n * Creates a new object built from the provided array and the key-generation\r\n * function.\r\n * @param {IArrayLike<T>} arr Array or array like object over\r\n *     which to iterate whose elements will be the values in the new object.\r\n * @param {?function(this:S, T, number, ?) : string} keyFunc The function to\r\n *     call for every element. This function takes 3 arguments (the element, the\r\n *     index and the array) and should return a string that will be used as the\r\n *     key for the element in the new object. If the function returns the same\r\n *     key for more than one element, the value for that key is\r\n *     implementation-defined.\r\n * @param {S=} opt_obj The object to be used as the value of 'this'\r\n *     within keyFunc.\r\n * @return {!Object<T>} The new object.\r\n * @template T,S\r\n */\r\ngoog.array.toObject = function(arr, keyFunc, opt_obj) {\r\n  var ret = {};\r\n  goog.array.forEach(arr, function(element, index) {\r\n    ret[keyFunc.call(/** @type {?} */ (opt_obj), element, index, arr)] =\r\n        element;\r\n  });\r\n  return ret;\r\n};\r\n\r\n\r\n/**\r\n * Creates a range of numbers in an arithmetic progression.\r\n *\r\n * Range takes 1, 2, or 3 arguments:\r\n * <pre>\r\n * range(5) is the same as range(0, 5, 1) and produces [0, 1, 2, 3, 4]\r\n * range(2, 5) is the same as range(2, 5, 1) and produces [2, 3, 4]\r\n * range(-2, -5, -1) produces [-2, -3, -4]\r\n * range(-2, -5, 1) produces [], since stepping by 1 wouldn't ever reach -5.\r\n * </pre>\r\n *\r\n * @param {number} startOrEnd The starting value of the range if an end argument\r\n *     is provided. Otherwise, the start value is 0, and this is the end value.\r\n * @param {number=} opt_end The optional end value of the range.\r\n * @param {number=} opt_step The step size between range values. Defaults to 1\r\n *     if opt_step is undefined or 0.\r\n * @return {!Array<number>} An array of numbers for the requested range. May be\r\n *     an empty array if adding the step would not converge toward the end\r\n *     value.\r\n */\r\ngoog.array.range = function(startOrEnd, opt_end, opt_step) {\r\n  var array = [];\r\n  var start = 0;\r\n  var end = startOrEnd;\r\n  var step = opt_step || 1;\r\n  if (opt_end !== undefined) {\r\n    start = startOrEnd;\r\n    end = opt_end;\r\n  }\r\n\r\n  if (step * (end - start) < 0) {\r\n    // Sign mismatch: start + step will never reach the end value.\r\n    return [];\r\n  }\r\n\r\n  if (step > 0) {\r\n    for (var i = start; i < end; i += step) {\r\n      array.push(i);\r\n    }\r\n  } else {\r\n    for (var i = start; i > end; i += step) {\r\n      array.push(i);\r\n    }\r\n  }\r\n  return array;\r\n};\r\n\r\n\r\n/**\r\n * Returns an array consisting of the given value repeated N times.\r\n *\r\n * @param {VALUE} value The value to repeat.\r\n * @param {number} n The repeat count.\r\n * @return {!Array<VALUE>} An array with the repeated value.\r\n * @template VALUE\r\n */\r\ngoog.array.repeat = function(value, n) {\r\n  var array = [];\r\n  for (var i = 0; i < n; i++) {\r\n    array[i] = value;\r\n  }\r\n  return array;\r\n};\r\n\r\n\r\n/**\r\n * Returns an array consisting of every argument with all arrays\r\n * expanded in-place recursively.\r\n *\r\n * @param {...*} var_args The values to flatten.\r\n * @return {!Array<?>} An array containing the flattened values.\r\n */\r\ngoog.array.flatten = function(var_args) {\r\n  var CHUNK_SIZE = 8192;\r\n\r\n  var result = [];\r\n  for (var i = 0; i < arguments.length; i++) {\r\n    var element = arguments[i];\r\n    if (goog.isArray(element)) {\r\n      for (var c = 0; c < element.length; c += CHUNK_SIZE) {\r\n        var chunk = goog.array.slice(element, c, c + CHUNK_SIZE);\r\n        var recurseResult = goog.array.flatten.apply(null, chunk);\r\n        for (var r = 0; r < recurseResult.length; r++) {\r\n          result.push(recurseResult[r]);\r\n        }\r\n      }\r\n    } else {\r\n      result.push(element);\r\n    }\r\n  }\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * Rotates an array in-place. After calling this method, the element at\r\n * index i will be the element previously at index (i - n) %\r\n * array.length, for all values of i between 0 and array.length - 1,\r\n * inclusive.\r\n *\r\n * For example, suppose list comprises [t, a, n, k, s]. After invoking\r\n * rotate(array, 1) (or rotate(array, -4)), array will comprise [s, t, a, n, k].\r\n *\r\n * @param {!Array<T>} array The array to rotate.\r\n * @param {number} n The amount to rotate.\r\n * @return {!Array<T>} The array.\r\n * @template T\r\n */\r\ngoog.array.rotate = function(array, n) {\r\n  goog.asserts.assert(array.length != null);\r\n\r\n  if (array.length) {\r\n    n %= array.length;\r\n    if (n > 0) {\r\n      Array.prototype.unshift.apply(array, array.splice(-n, n));\r\n    } else if (n < 0) {\r\n      Array.prototype.push.apply(array, array.splice(0, -n));\r\n    }\r\n  }\r\n  return array;\r\n};\r\n\r\n\r\n/**\r\n * Moves one item of an array to a new position keeping the order of the rest\r\n * of the items. Example use case: keeping a list of JavaScript objects\r\n * synchronized with the corresponding list of DOM elements after one of the\r\n * elements has been dragged to a new position.\r\n * @param {!IArrayLike<?>} arr The array to modify.\r\n * @param {number} fromIndex Index of the item to move between 0 and\r\n *     {@code arr.length - 1}.\r\n * @param {number} toIndex Target index between 0 and {@code arr.length - 1}.\r\n */\r\ngoog.array.moveItem = function(arr, fromIndex, toIndex) {\r\n  goog.asserts.assert(fromIndex >= 0 && fromIndex < arr.length);\r\n  goog.asserts.assert(toIndex >= 0 && toIndex < arr.length);\r\n  // Remove 1 item at fromIndex.\r\n  var removedItems = Array.prototype.splice.call(arr, fromIndex, 1);\r\n  // Insert the removed item at toIndex.\r\n  Array.prototype.splice.call(arr, toIndex, 0, removedItems[0]);\r\n  // We don't use goog.array.insertAt and goog.array.removeAt, because they're\r\n  // significantly slower than splice.\r\n};\r\n\r\n\r\n/**\r\n * Creates a new array for which the element at position i is an array of the\r\n * ith element of the provided arrays.  The returned array will only be as long\r\n * as the shortest array provided; additional values are ignored.  For example,\r\n * the result of zipping [1, 2] and [3, 4, 5] is [[1,3], [2, 4]].\r\n *\r\n * This is similar to the zip() function in Python.  See {@link\r\n * http://docs.python.org/library/functions.html#zip}\r\n *\r\n * @param {...!IArrayLike<?>} var_args Arrays to be combined.\r\n * @return {!Array<!Array<?>>} A new array of arrays created from\r\n *     provided arrays.\r\n */\r\ngoog.array.zip = function(var_args) {\r\n  if (!arguments.length) {\r\n    return [];\r\n  }\r\n  var result = [];\r\n  var minLen = arguments[0].length;\r\n  for (var i = 1; i < arguments.length; i++) {\r\n    if (arguments[i].length < minLen) {\r\n      minLen = arguments[i].length;\r\n    }\r\n  }\r\n  for (var i = 0; i < minLen; i++) {\r\n    var value = [];\r\n    for (var j = 0; j < arguments.length; j++) {\r\n      value.push(arguments[j][i]);\r\n    }\r\n    result.push(value);\r\n  }\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * Shuffles the values in the specified array using the Fisher-Yates in-place\r\n * shuffle (also known as the Knuth Shuffle). By default, calls Math.random()\r\n * and so resets the state of that random number generator. Similarly, may reset\r\n * the state of any other specified random number generator.\r\n *\r\n * Runtime: O(n)\r\n *\r\n * @param {!Array<?>} arr The array to be shuffled.\r\n * @param {function():number=} opt_randFn Optional random function to use for\r\n *     shuffling.\r\n *     Takes no arguments, and returns a random number on the interval [0, 1).\r\n *     Defaults to Math.random() using JavaScript's built-in Math library.\r\n */\r\ngoog.array.shuffle = function(arr, opt_randFn) {\r\n  var randFn = opt_randFn || Math.random;\r\n\r\n  for (var i = arr.length - 1; i > 0; i--) {\r\n    // Choose a random array index in [0, i] (inclusive with i).\r\n    var j = Math.floor(randFn() * (i + 1));\r\n\r\n    var tmp = arr[i];\r\n    arr[i] = arr[j];\r\n    arr[j] = tmp;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Returns a new array of elements from arr, based on the indexes of elements\r\n * provided by index_arr. For example, the result of index copying\r\n * ['a', 'b', 'c'] with index_arr [1,0,0,2] is ['b', 'a', 'a', 'c'].\r\n *\r\n * @param {!IArrayLike<T>} arr The array to get a indexed copy from.\r\n * @param {!IArrayLike<number>} index_arr An array of indexes to get from arr.\r\n * @return {!Array<T>} A new array of elements from arr in index_arr order.\r\n * @template T\r\n */\r\ngoog.array.copyByIndex = function(arr, index_arr) {\r\n  var result = [];\r\n  goog.array.forEach(index_arr, function(index) { result.push(arr[index]); });\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * Maps each element of the input array into zero or more elements of the output\r\n * array.\r\n *\r\n * @param {!IArrayLike<VALUE>|string} arr Array or array like object\r\n *     over which to iterate.\r\n * @param {function(this:THIS, VALUE, number, ?): !Array<RESULT>} f The function\r\n *     to call for every element. This function takes 3 arguments (the element,\r\n *     the index and the array) and should return an array. The result will be\r\n *     used to extend a new array.\r\n * @param {THIS=} opt_obj The object to be used as the value of 'this' within f.\r\n * @return {!Array<RESULT>} a new array with the concatenation of all arrays\r\n *     returned from f.\r\n * @template THIS, VALUE, RESULT\r\n */\r\ngoog.array.concatMap = function(arr, f, opt_obj) {\r\n  return goog.array.concat.apply([], goog.array.map(arr, f, opt_obj));\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Wrapper class for handling XmlHttpRequests.\r\n *\r\n * One off requests can be sent through goog.net.XhrIo.send() or an\r\n * instance can be created to send multiple requests.  Each request uses its\r\n * own XmlHttpRequest object and handles clearing of the event callback to\r\n * ensure no leaks.\r\n *\r\n * XhrIo is event based, it dispatches events on success, failure, finishing,\r\n * ready-state change, or progress (download and upload).\r\n *\r\n * The ready-state or timeout event fires first, followed by\r\n * a generic completed event. Then the abort, error, or success event\r\n * is fired as appropriate. Progress events are fired as they are\r\n * received. Lastly, the ready event will fire to indicate that the\r\n * object may be used to make another request.\r\n *\r\n * The error event may also be called before completed and\r\n * ready-state-change if the XmlHttpRequest.open() or .send() methods throw.\r\n *\r\n * This class does not support multiple requests, queuing, or prioritization.\r\n *\r\n * When progress events are supported by the browser, and progress is\r\n * enabled via .setProgressEventsEnabled(true), the\r\n * goog.net.EventType.PROGRESS event will be the re-dispatched browser\r\n * progress event. Additionally, a DOWNLOAD_PROGRESS or UPLOAD_PROGRESS event\r\n * will be fired for download and upload progress respectively.\r\n *\r\n */\r\n\r\n\r\ngoog.provide('goog.net.XhrIo');\r\ngoog.provide('goog.net.XhrIo.ResponseType');\r\n\r\ngoog.require('goog.Timer');\r\ngoog.require('goog.array');\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.debug.entryPointRegistry');\r\ngoog.require('goog.events.EventTarget');\r\ngoog.require('goog.json.hybrid');\r\ngoog.require('goog.log');\r\ngoog.require('goog.net.ErrorCode');\r\ngoog.require('goog.net.EventType');\r\ngoog.require('goog.net.HttpStatus');\r\ngoog.require('goog.net.XmlHttp');\r\ngoog.require('goog.object');\r\ngoog.require('goog.string');\r\ngoog.require('goog.structs');\r\ngoog.require('goog.structs.Map');\r\ngoog.require('goog.uri.utils');\r\ngoog.require('goog.userAgent');\r\n\r\ngoog.forwardDeclare('goog.Uri');\r\n\r\ngoog.scope(function() {\r\n\r\n/**\r\n * Basic class for handling XMLHttpRequests.\r\n * @param {goog.net.XmlHttpFactory=} opt_xmlHttpFactory Factory to use when\r\n *     creating XMLHttpRequest objects.\r\n * @constructor\r\n * @extends {goog.events.EventTarget}\r\n */\r\ngoog.net.XhrIo = function(opt_xmlHttpFactory) {\r\n  XhrIo.base(this, 'constructor');\r\n\r\n  /**\r\n   * Map of default headers to add to every request, use:\r\n   * XhrIo.headers.set(name, value)\r\n   * @type {!goog.structs.Map}\r\n   */\r\n  this.headers = new goog.structs.Map();\r\n\r\n  /**\r\n   * Optional XmlHttpFactory\r\n   * @private {goog.net.XmlHttpFactory}\r\n   */\r\n  this.xmlHttpFactory_ = opt_xmlHttpFactory || null;\r\n\r\n  /**\r\n   * Whether XMLHttpRequest is active.  A request is active from the time send()\r\n   * is called until onReadyStateChange() is complete, or error() or abort()\r\n   * is called.\r\n   * @private {boolean}\r\n   */\r\n  this.active_ = false;\r\n\r\n  /**\r\n   * The XMLHttpRequest object that is being used for the transfer.\r\n   * @private {?goog.net.XhrLike.OrNative}\r\n   */\r\n  this.xhr_ = null;\r\n\r\n  /**\r\n   * The options to use with the current XMLHttpRequest object.\r\n   * @private {?Object}\r\n   */\r\n  this.xhrOptions_ = null;\r\n\r\n  /**\r\n   * Last URL that was requested.\r\n   * @private {string|goog.Uri}\r\n   */\r\n  this.lastUri_ = '';\r\n\r\n  /**\r\n   * Method for the last request.\r\n   * @private {string}\r\n   */\r\n  this.lastMethod_ = '';\r\n\r\n  /**\r\n   * Last error code.\r\n   * @private {!goog.net.ErrorCode}\r\n   */\r\n  this.lastErrorCode_ = goog.net.ErrorCode.NO_ERROR;\r\n\r\n  /**\r\n   * Last error message.\r\n   * @private {Error|string}\r\n   */\r\n  this.lastError_ = '';\r\n\r\n  /**\r\n   * Used to ensure that we don't dispatch an multiple ERROR events. This can\r\n   * happen in IE when it does a synchronous load and one error is handled in\r\n   * the ready statte change and one is handled due to send() throwing an\r\n   * exception.\r\n   * @private {boolean}\r\n   */\r\n  this.errorDispatched_ = false;\r\n\r\n  /**\r\n   * Used to make sure we don't fire the complete event from inside a send call.\r\n   * @private {boolean}\r\n   */\r\n  this.inSend_ = false;\r\n\r\n  /**\r\n   * Used in determining if a call to {@link #onReadyStateChange_} is from\r\n   * within a call to this.xhr_.open.\r\n   * @private {boolean}\r\n   */\r\n  this.inOpen_ = false;\r\n\r\n  /**\r\n   * Used in determining if a call to {@link #onReadyStateChange_} is from\r\n   * within a call to this.xhr_.abort.\r\n   * @private {boolean}\r\n   */\r\n  this.inAbort_ = false;\r\n\r\n  /**\r\n   * Number of milliseconds after which an incomplete request will be aborted\r\n   * and a {@link goog.net.EventType.TIMEOUT} event raised; 0 means no timeout\r\n   * is set.\r\n   * @private {number}\r\n   */\r\n  this.timeoutInterval_ = 0;\r\n\r\n  /**\r\n   * Timer to track request timeout.\r\n   * @private {?number}\r\n   */\r\n  this.timeoutId_ = null;\r\n\r\n  /**\r\n   * The requested type for the response. The empty string means use the default\r\n   * XHR behavior.\r\n   * @private {goog.net.XhrIo.ResponseType}\r\n   */\r\n  this.responseType_ = ResponseType.DEFAULT;\r\n\r\n  /**\r\n   * Whether a \"credentialed\" request is to be sent (one that is aware of\r\n   * cookies and authentication). This is applicable only for cross-domain\r\n   * requests and more recent browsers that support this part of the HTTP Access\r\n   * Control standard.\r\n   *\r\n   * @see http://www.w3.org/TR/XMLHttpRequest/#the-withcredentials-attribute\r\n   *\r\n   * @private {boolean}\r\n   */\r\n  this.withCredentials_ = false;\r\n\r\n  /**\r\n   * Whether progress events are enabled for this request. This is\r\n   * disabled by default because setting a progress event handler\r\n   * causes pre-flight OPTIONS requests to be sent for CORS requests,\r\n   * even in cases where a pre-flight request would not otherwise be\r\n   * sent.\r\n   *\r\n   * @see http://xhr.spec.whatwg.org/#security-considerations\r\n   *\r\n   * Note that this can cause problems for Firefox 22 and below, as an\r\n   * older \"LSProgressEvent\" will be dispatched by the browser. That\r\n   * progress event is no longer supported, and can lead to failures,\r\n   * including throwing exceptions.\r\n   *\r\n   * @see http://bugzilla.mozilla.org/show_bug.cgi?id=845631\r\n   * @see b/23469793\r\n   *\r\n   * @private {boolean}\r\n   */\r\n  this.progressEventsEnabled_ = false;\r\n\r\n  /**\r\n   * True if we can use XMLHttpRequest's timeout directly.\r\n   * @private {boolean}\r\n   */\r\n  this.useXhr2Timeout_ = false;\r\n};\r\ngoog.inherits(goog.net.XhrIo, goog.events.EventTarget);\r\n\r\nvar XhrIo = goog.net.XhrIo;\r\n\r\n/**\r\n * Response types that may be requested for XMLHttpRequests.\r\n * @enum {string}\r\n * @see http://www.w3.org/TR/XMLHttpRequest/#the-responsetype-attribute\r\n */\r\ngoog.net.XhrIo.ResponseType = {\r\n  DEFAULT: '',\r\n  TEXT: 'text',\r\n  DOCUMENT: 'document',\r\n  // Not supported as of Chrome 10.0.612.1 dev\r\n  BLOB: 'blob',\r\n  ARRAY_BUFFER: 'arraybuffer'\r\n};\r\n\r\nvar ResponseType = goog.net.XhrIo.ResponseType;\r\n\r\n\r\n/**\r\n * A reference to the XhrIo logger\r\n * @private {?goog.log.Logger}\r\n * @const\r\n */\r\ngoog.net.XhrIo.prototype.logger_ = goog.log.getLogger('goog.net.XhrIo');\r\n\r\n\r\n/**\r\n * The Content-Type HTTP header name\r\n * @type {string}\r\n */\r\ngoog.net.XhrIo.CONTENT_TYPE_HEADER = 'Content-Type';\r\n\r\n\r\n/**\r\n * The Content-Transfer-Encoding HTTP header name\r\n * @type {string}\r\n */\r\ngoog.net.XhrIo.CONTENT_TRANSFER_ENCODING = 'Content-Transfer-Encoding';\r\n\r\n\r\n/**\r\n * The pattern matching the 'http' and 'https' URI schemes\r\n * @type {!RegExp}\r\n */\r\ngoog.net.XhrIo.HTTP_SCHEME_PATTERN = /^https?$/i;\r\n\r\n\r\n/**\r\n * The methods that typically come along with form data.  We set different\r\n * headers depending on whether the HTTP action is one of these.\r\n * @type {!Array<string>}\r\n */\r\ngoog.net.XhrIo.METHODS_WITH_FORM_DATA = ['POST', 'PUT'];\r\n\r\n\r\n/**\r\n * The Content-Type HTTP header value for a url-encoded form\r\n * @type {string}\r\n */\r\ngoog.net.XhrIo.FORM_CONTENT_TYPE =\r\n    'application/x-www-form-urlencoded;charset=utf-8';\r\n\r\n\r\n/**\r\n * The XMLHttpRequest Level two timeout delay ms property name.\r\n *\r\n * @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute\r\n *\r\n * @private {string}\r\n * @const\r\n */\r\ngoog.net.XhrIo.XHR2_TIMEOUT_ = 'timeout';\r\n\r\n\r\n/**\r\n * The XMLHttpRequest Level two ontimeout handler property name.\r\n *\r\n * @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute\r\n *\r\n * @private {string}\r\n * @const\r\n */\r\ngoog.net.XhrIo.XHR2_ON_TIMEOUT_ = 'ontimeout';\r\n\r\n\r\n/**\r\n * All non-disposed instances of goog.net.XhrIo created\r\n * by {@link goog.net.XhrIo.send} are in this Array.\r\n * @see goog.net.XhrIo.cleanup\r\n * @private {!Array<!goog.net.XhrIo>}\r\n */\r\ngoog.net.XhrIo.sendInstances_ = [];\r\n\r\n\r\n/**\r\n * Static send that creates a short lived instance of XhrIo to send the\r\n * request.\r\n * @see goog.net.XhrIo.cleanup\r\n * @param {string|goog.Uri} url Uri to make request to.\r\n * @param {?function(this:goog.net.XhrIo, ?)=} opt_callback Callback function\r\n *     for when request is complete.\r\n * @param {string=} opt_method Send method, default: GET.\r\n * @param {ArrayBuffer|ArrayBufferView|Blob|Document|FormData|string=}\r\n *     opt_content Body data.\r\n * @param {Object|goog.structs.Map=} opt_headers Map of headers to add to the\r\n *     request.\r\n * @param {number=} opt_timeoutInterval Number of milliseconds after which an\r\n *     incomplete request will be aborted; 0 means no timeout is set.\r\n * @param {boolean=} opt_withCredentials Whether to send credentials with the\r\n *     request. Default to false. See {@link goog.net.XhrIo#setWithCredentials}.\r\n * @return {!goog.net.XhrIo} The sent XhrIo.\r\n */\r\ngoog.net.XhrIo.send = function(\r\n    url, opt_callback, opt_method, opt_content, opt_headers,\r\n    opt_timeoutInterval, opt_withCredentials) {\r\n  var x = new goog.net.XhrIo();\r\n  goog.net.XhrIo.sendInstances_.push(x);\r\n  if (opt_callback) {\r\n    x.listen(goog.net.EventType.COMPLETE, opt_callback);\r\n  }\r\n  x.listenOnce(goog.net.EventType.READY, x.cleanupSend_);\r\n  if (opt_timeoutInterval) {\r\n    x.setTimeoutInterval(opt_timeoutInterval);\r\n  }\r\n  if (opt_withCredentials) {\r\n    x.setWithCredentials(opt_withCredentials);\r\n  }\r\n  x.send(url, opt_method, opt_content, opt_headers);\r\n  return x;\r\n};\r\n\r\n\r\n/**\r\n * Disposes all non-disposed instances of goog.net.XhrIo created by\r\n * {@link goog.net.XhrIo.send}.\r\n * {@link goog.net.XhrIo.send} cleans up the goog.net.XhrIo instance\r\n * it creates when the request completes or fails.  However, if\r\n * the request never completes, then the goog.net.XhrIo is not disposed.\r\n * This can occur if the window is unloaded before the request completes.\r\n * We could have {@link goog.net.XhrIo.send} return the goog.net.XhrIo\r\n * it creates and make the client of {@link goog.net.XhrIo.send} be\r\n * responsible for disposing it in this case.  However, this makes things\r\n * significantly more complicated for the client, and the whole point\r\n * of {@link goog.net.XhrIo.send} is that it's simple and easy to use.\r\n * Clients of {@link goog.net.XhrIo.send} should call\r\n * {@link goog.net.XhrIo.cleanup} when doing final\r\n * cleanup on window unload.\r\n */\r\ngoog.net.XhrIo.cleanup = function() {\r\n  var instances = goog.net.XhrIo.sendInstances_;\r\n  while (instances.length) {\r\n    instances.pop().dispose();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Installs exception protection for all entry point introduced by\r\n * goog.net.XhrIo instances which are not protected by\r\n * {@link goog.debug.ErrorHandler#protectWindowSetTimeout},\r\n * {@link goog.debug.ErrorHandler#protectWindowSetInterval}, or\r\n * {@link goog.events.protectBrowserEventEntryPoint}.\r\n *\r\n * @param {goog.debug.ErrorHandler} errorHandler Error handler with which to\r\n *     protect the entry point(s).\r\n */\r\ngoog.net.XhrIo.protectEntryPoints = function(errorHandler) {\r\n  goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ =\r\n      errorHandler.protectEntryPoint(\r\n          goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_);\r\n};\r\n\r\n\r\n/**\r\n * Disposes of the specified goog.net.XhrIo created by\r\n * {@link goog.net.XhrIo.send} and removes it from\r\n * {@link goog.net.XhrIo.pendingStaticSendInstances_}.\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.cleanupSend_ = function() {\r\n  this.dispose();\r\n  goog.array.remove(goog.net.XhrIo.sendInstances_, this);\r\n};\r\n\r\n\r\n/**\r\n * Returns the number of milliseconds after which an incomplete request will be\r\n * aborted, or 0 if no timeout is set.\r\n * @return {number} Timeout interval in milliseconds.\r\n */\r\ngoog.net.XhrIo.prototype.getTimeoutInterval = function() {\r\n  return this.timeoutInterval_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the number of milliseconds after which an incomplete request will be\r\n * aborted and a {@link goog.net.EventType.TIMEOUT} event raised; 0 means no\r\n * timeout is set.\r\n * @param {number} ms Timeout interval in milliseconds; 0 means none.\r\n */\r\ngoog.net.XhrIo.prototype.setTimeoutInterval = function(ms) {\r\n  this.timeoutInterval_ = Math.max(0, ms);\r\n};\r\n\r\n\r\n/**\r\n * Sets the desired type for the response. At time of writing, this is only\r\n * supported in very recent versions of WebKit (10.0.612.1 dev and later).\r\n *\r\n * If this is used, the response may only be accessed via {@link #getResponse}.\r\n *\r\n * @param {goog.net.XhrIo.ResponseType} type The desired type for the response.\r\n */\r\ngoog.net.XhrIo.prototype.setResponseType = function(type) {\r\n  this.responseType_ = type;\r\n};\r\n\r\n\r\n/**\r\n * Gets the desired type for the response.\r\n * @return {goog.net.XhrIo.ResponseType} The desired type for the response.\r\n */\r\ngoog.net.XhrIo.prototype.getResponseType = function() {\r\n  return this.responseType_;\r\n};\r\n\r\n\r\n/**\r\n * Sets whether a \"credentialed\" request that is aware of cookie and\r\n * authentication information should be made. This option is only supported by\r\n * browsers that support HTTP Access Control. As of this writing, this option\r\n * is not supported in IE.\r\n *\r\n * @param {boolean} withCredentials Whether this should be a \"credentialed\"\r\n *     request.\r\n */\r\ngoog.net.XhrIo.prototype.setWithCredentials = function(withCredentials) {\r\n  this.withCredentials_ = withCredentials;\r\n};\r\n\r\n\r\n/**\r\n * Gets whether a \"credentialed\" request is to be sent.\r\n * @return {boolean} The desired type for the response.\r\n */\r\ngoog.net.XhrIo.prototype.getWithCredentials = function() {\r\n  return this.withCredentials_;\r\n};\r\n\r\n\r\n/**\r\n * Sets whether progress events are enabled for this request. Note\r\n * that progress events require pre-flight OPTIONS request handling\r\n * for CORS requests, and may cause trouble with older browsers. See\r\n * progressEventsEnabled_ for details.\r\n * @param {boolean} enabled Whether progress events should be enabled.\r\n */\r\ngoog.net.XhrIo.prototype.setProgressEventsEnabled = function(enabled) {\r\n  this.progressEventsEnabled_ = enabled;\r\n};\r\n\r\n\r\n/**\r\n * Gets whether progress events are enabled.\r\n * @return {boolean} Whether progress events are enabled for this request.\r\n */\r\ngoog.net.XhrIo.prototype.getProgressEventsEnabled = function() {\r\n  return this.progressEventsEnabled_;\r\n};\r\n\r\n\r\n/**\r\n * Instance send that actually uses XMLHttpRequest to make a server call.\r\n * @param {string|goog.Uri} url Uri to make request to.\r\n * @param {string=} opt_method Send method, default: GET.\r\n * @param {ArrayBuffer|ArrayBufferView|Blob|Document|FormData|string=}\r\n *     opt_content Body data.\r\n * @param {Object|goog.structs.Map=} opt_headers Map of headers to add to the\r\n *     request.\r\n * @suppress {deprecated} Use deprecated goog.structs.forEach to allow different\r\n * types of parameters for opt_headers.\r\n */\r\ngoog.net.XhrIo.prototype.send = function(\r\n    url, opt_method, opt_content, opt_headers) {\r\n  if (this.xhr_) {\r\n    throw new Error(\r\n        '[goog.net.XhrIo] Object is active with another request=' +\r\n        this.lastUri_ + '; newUri=' + url);\r\n  }\r\n\r\n  var method = opt_method ? opt_method.toUpperCase() : 'GET';\r\n\r\n  this.lastUri_ = url;\r\n  this.lastError_ = '';\r\n  this.lastErrorCode_ = goog.net.ErrorCode.NO_ERROR;\r\n  this.lastMethod_ = method;\r\n  this.errorDispatched_ = false;\r\n  this.active_ = true;\r\n\r\n  // Use the factory to create the XHR object and options\r\n  this.xhr_ = this.createXhr();\r\n  this.xhrOptions_ = this.xmlHttpFactory_ ? this.xmlHttpFactory_.getOptions() :\r\n                                            goog.net.XmlHttp.getOptions();\r\n\r\n  // Set up the onreadystatechange callback\r\n  this.xhr_.onreadystatechange = goog.bind(this.onReadyStateChange_, this);\r\n\r\n  // Set up upload/download progress events, if progress events are supported.\r\n  if (this.getProgressEventsEnabled() && 'onprogress' in this.xhr_) {\r\n    this.xhr_.onprogress =\r\n        goog.bind(function(e) { this.onProgressHandler_(e, true); }, this);\r\n    if (this.xhr_.upload) {\r\n      this.xhr_.upload.onprogress = goog.bind(this.onProgressHandler_, this);\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Try to open the XMLHttpRequest (always async), if an error occurs here it\r\n   * is generally permission denied\r\n   */\r\n  try {\r\n    goog.log.fine(this.logger_, this.formatMsg_('Opening Xhr'));\r\n    this.inOpen_ = true;\r\n    this.xhr_.open(method, String(url), true);  // Always async!\r\n    this.inOpen_ = false;\r\n  } catch (err) {\r\n    goog.log.fine(\r\n        this.logger_, this.formatMsg_('Error opening Xhr: ' + err.message));\r\n    this.error_(goog.net.ErrorCode.EXCEPTION, err);\r\n    return;\r\n  }\r\n\r\n  // We can't use null since this won't allow requests with form data to have a\r\n  // content length specified which will cause some proxies to return a 411\r\n  // error.\r\n  var content = opt_content || '';\r\n\r\n  var headers = this.headers.clone();\r\n\r\n  // Add headers specific to this request\r\n  if (opt_headers) {\r\n    goog.structs.forEach(\r\n        opt_headers, function(value, key) { headers.set(key, value); });\r\n  }\r\n\r\n  // Find whether a content type header is set, ignoring case.\r\n  // HTTP header names are case-insensitive.  See:\r\n  // http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2\r\n  var contentTypeKey =\r\n      goog.array.find(headers.getKeys(), goog.net.XhrIo.isContentTypeHeader_);\r\n\r\n  var contentIsFormData =\r\n      (goog.global['FormData'] && (content instanceof goog.global['FormData']));\r\n  if (goog.array.contains(goog.net.XhrIo.METHODS_WITH_FORM_DATA, method) &&\r\n      !contentTypeKey && !contentIsFormData) {\r\n    // For requests typically with form data, default to the url-encoded form\r\n    // content type unless this is a FormData request.  For FormData,\r\n    // the browser will automatically add a multipart/form-data content type\r\n    // with an appropriate multipart boundary.\r\n    headers.set(\r\n        goog.net.XhrIo.CONTENT_TYPE_HEADER, goog.net.XhrIo.FORM_CONTENT_TYPE);\r\n  }\r\n\r\n  // Add the headers to the Xhr object\r\n  headers.forEach(function(value, key) {\r\n    this.xhr_.setRequestHeader(key, value);\r\n  }, this);\r\n\r\n  if (this.responseType_) {\r\n    this.xhr_.responseType = this.responseType_;\r\n  }\r\n  // Set xhr_.withCredentials only when the value is different, or else in\r\n  // synchronous XMLHtppRequest.open Firefox will throw an exception.\r\n  // https://bugzilla.mozilla.org/show_bug.cgi?id=736340\r\n  if ('withCredentials' in this.xhr_ &&\r\n      this.xhr_.withCredentials !== this.withCredentials_) {\r\n    this.xhr_.withCredentials = this.withCredentials_;\r\n  }\r\n\r\n  /**\r\n   * Try to send the request, or other wise report an error (404 not found).\r\n   */\r\n  try {\r\n    this.cleanUpTimeoutTimer_();  // Paranoid, should never be running.\r\n    if (this.timeoutInterval_ > 0) {\r\n      this.useXhr2Timeout_ = goog.net.XhrIo.shouldUseXhr2Timeout_(this.xhr_);\r\n      goog.log.fine(\r\n          this.logger_, this.formatMsg_(\r\n                            'Will abort after ' + this.timeoutInterval_ +\r\n                            'ms if incomplete, xhr2 ' + this.useXhr2Timeout_));\r\n      if (this.useXhr2Timeout_) {\r\n        this.xhr_[goog.net.XhrIo.XHR2_TIMEOUT_] = this.timeoutInterval_;\r\n        this.xhr_[goog.net.XhrIo.XHR2_ON_TIMEOUT_] =\r\n            goog.bind(this.timeout_, this);\r\n      } else {\r\n        this.timeoutId_ =\r\n            goog.Timer.callOnce(this.timeout_, this.timeoutInterval_, this);\r\n      }\r\n    }\r\n    goog.log.fine(this.logger_, this.formatMsg_('Sending request'));\r\n    this.inSend_ = true;\r\n    this.xhr_.send(content);\r\n    this.inSend_ = false;\r\n\r\n  } catch (err) {\r\n    goog.log.fine(this.logger_, this.formatMsg_('Send error: ' + err.message));\r\n    this.error_(goog.net.ErrorCode.EXCEPTION, err);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Determines if the argument is an XMLHttpRequest that supports the level 2\r\n * timeout value and event.\r\n *\r\n * Currently, FF 21.0 OS X has the fields but won't actually call the timeout\r\n * handler.  Perhaps the confusion in the bug referenced below hasn't\r\n * entirely been resolved.\r\n *\r\n * @see http://www.w3.org/TR/XMLHttpRequest/#the-timeout-attribute\r\n * @see https://bugzilla.mozilla.org/show_bug.cgi?id=525816\r\n *\r\n * @param {!goog.net.XhrLike.OrNative} xhr The request.\r\n * @return {boolean} True if the request supports level 2 timeout.\r\n * @private\r\n */\r\ngoog.net.XhrIo.shouldUseXhr2Timeout_ = function(xhr) {\r\n  return goog.userAgent.IE && goog.userAgent.isVersionOrHigher(9) &&\r\n      goog.isNumber(xhr[goog.net.XhrIo.XHR2_TIMEOUT_]) &&\r\n      goog.isDef(xhr[goog.net.XhrIo.XHR2_ON_TIMEOUT_]);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} header An HTTP header key.\r\n * @return {boolean} Whether the key is a content type header (ignoring\r\n *     case.\r\n * @private\r\n */\r\ngoog.net.XhrIo.isContentTypeHeader_ = function(header) {\r\n  return goog.string.caseInsensitiveEquals(\r\n      goog.net.XhrIo.CONTENT_TYPE_HEADER, header);\r\n};\r\n\r\n\r\n/**\r\n * Creates a new XHR object.\r\n * @return {!goog.net.XhrLike.OrNative} The newly created XHR object.\r\n * @protected\r\n */\r\ngoog.net.XhrIo.prototype.createXhr = function() {\r\n  return this.xmlHttpFactory_ ? this.xmlHttpFactory_.createInstance() :\r\n                                goog.net.XmlHttp();\r\n};\r\n\r\n\r\n/**\r\n * The request didn't complete after {@link goog.net.XhrIo#timeoutInterval_}\r\n * milliseconds; raises a {@link goog.net.EventType.TIMEOUT} event and aborts\r\n * the request.\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.timeout_ = function() {\r\n  if (typeof goog == 'undefined') {\r\n    // If goog is undefined then the callback has occurred as the application\r\n    // is unloading and will error.  Thus we let it silently fail.\r\n  } else if (this.xhr_) {\r\n    this.lastError_ =\r\n        'Timed out after ' + this.timeoutInterval_ + 'ms, aborting';\r\n    this.lastErrorCode_ = goog.net.ErrorCode.TIMEOUT;\r\n    goog.log.fine(this.logger_, this.formatMsg_(this.lastError_));\r\n    this.dispatchEvent(goog.net.EventType.TIMEOUT);\r\n    this.abort(goog.net.ErrorCode.TIMEOUT);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Something errorred, so inactivate, fire error callback and clean up\r\n * @param {goog.net.ErrorCode} errorCode The error code.\r\n * @param {Error} err The error object.\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.error_ = function(errorCode, err) {\r\n  this.active_ = false;\r\n  if (this.xhr_) {\r\n    this.inAbort_ = true;\r\n    this.xhr_.abort();  // Ensures XHR isn't hung (FF)\r\n    this.inAbort_ = false;\r\n  }\r\n  this.lastError_ = err;\r\n  this.lastErrorCode_ = errorCode;\r\n  this.dispatchErrors_();\r\n  this.cleanUpXhr_();\r\n};\r\n\r\n\r\n/**\r\n * Dispatches COMPLETE and ERROR in case of an error. This ensures that we do\r\n * not dispatch multiple error events.\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.dispatchErrors_ = function() {\r\n  if (!this.errorDispatched_) {\r\n    this.errorDispatched_ = true;\r\n    this.dispatchEvent(goog.net.EventType.COMPLETE);\r\n    this.dispatchEvent(goog.net.EventType.ERROR);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Abort the current XMLHttpRequest\r\n * @param {goog.net.ErrorCode=} opt_failureCode Optional error code to use -\r\n *     defaults to ABORT.\r\n */\r\ngoog.net.XhrIo.prototype.abort = function(opt_failureCode) {\r\n  if (this.xhr_ && this.active_) {\r\n    goog.log.fine(this.logger_, this.formatMsg_('Aborting'));\r\n    this.active_ = false;\r\n    this.inAbort_ = true;\r\n    this.xhr_.abort();\r\n    this.inAbort_ = false;\r\n    this.lastErrorCode_ = opt_failureCode || goog.net.ErrorCode.ABORT;\r\n    this.dispatchEvent(goog.net.EventType.COMPLETE);\r\n    this.dispatchEvent(goog.net.EventType.ABORT);\r\n    this.cleanUpXhr_();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Nullifies all callbacks to reduce risks of leaks.\r\n * @override\r\n * @protected\r\n */\r\ngoog.net.XhrIo.prototype.disposeInternal = function() {\r\n  if (this.xhr_) {\r\n    // We explicitly do not call xhr_.abort() unless active_ is still true.\r\n    // This is to avoid unnecessarily aborting a successful request when\r\n    // dispose() is called in a callback triggered by a complete response, but\r\n    // in which browser cleanup has not yet finished.\r\n    // (See http://b/issue?id=1684217.)\r\n    if (this.active_) {\r\n      this.active_ = false;\r\n      this.inAbort_ = true;\r\n      this.xhr_.abort();\r\n      this.inAbort_ = false;\r\n    }\r\n    this.cleanUpXhr_(true);\r\n  }\r\n\r\n  XhrIo.base(this, 'disposeInternal');\r\n};\r\n\r\n\r\n/**\r\n * Internal handler for the XHR object's readystatechange event.  This method\r\n * checks the status and the readystate and fires the correct callbacks.\r\n * If the request has ended, the handlers are cleaned up and the XHR object is\r\n * nullified.\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.onReadyStateChange_ = function() {\r\n  if (this.isDisposed()) {\r\n    // This method is the target of an untracked goog.Timer.callOnce().\r\n    return;\r\n  }\r\n  if (!this.inOpen_ && !this.inSend_ && !this.inAbort_) {\r\n    // Were not being called from within a call to this.xhr_.send\r\n    // this.xhr_.abort, or this.xhr_.open, so this is an entry point\r\n    this.onReadyStateChangeEntryPoint_();\r\n  } else {\r\n    this.onReadyStateChangeHelper_();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Used to protect the onreadystatechange handler entry point.  Necessary\r\n * as {#onReadyStateChange_} maybe called from within send or abort, this\r\n * method is only called when {#onReadyStateChange_} is called as an\r\n * entry point.\r\n * {@see #protectEntryPoints}\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ = function() {\r\n  this.onReadyStateChangeHelper_();\r\n};\r\n\r\n\r\n/**\r\n * Helper for {@link #onReadyStateChange_}.  This is used so that\r\n * entry point calls to {@link #onReadyStateChange_} can be routed through\r\n * {@link #onReadyStateChangeEntryPoint_}.\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.onReadyStateChangeHelper_ = function() {\r\n  if (!this.active_) {\r\n    // can get called inside abort call\r\n    return;\r\n  }\r\n\r\n  if (typeof goog == 'undefined') {\r\n    // NOTE(user): If goog is undefined then the callback has occurred as the\r\n    // application is unloading and will error.  Thus we let it silently fail.\r\n\r\n  } else if (\r\n      this.xhrOptions_[goog.net.XmlHttp.OptionType.LOCAL_REQUEST_ERROR] &&\r\n      this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE &&\r\n      this.getStatus() == 2) {\r\n    // NOTE(user): In IE if send() errors on a *local* request the readystate\r\n    // is still changed to COMPLETE.  We need to ignore it and allow the\r\n    // try/catch around send() to pick up the error.\r\n    goog.log.fine(\r\n        this.logger_,\r\n        this.formatMsg_('Local request error detected and ignored'));\r\n\r\n  } else {\r\n    // In IE when the response has been cached we sometimes get the callback\r\n    // from inside the send call and this usually breaks code that assumes that\r\n    // XhrIo is asynchronous.  If that is the case we delay the callback\r\n    // using a timer.\r\n    if (this.inSend_ &&\r\n        this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE) {\r\n      goog.Timer.callOnce(this.onReadyStateChange_, 0, this);\r\n      return;\r\n    }\r\n\r\n    this.dispatchEvent(goog.net.EventType.READY_STATE_CHANGE);\r\n\r\n    // readyState indicates the transfer has finished\r\n    if (this.isComplete()) {\r\n      goog.log.fine(this.logger_, this.formatMsg_('Request complete'));\r\n\r\n      this.active_ = false;\r\n\r\n      try {\r\n        // Call the specific callbacks for success or failure. Only call the\r\n        // success if the status is 200 (HTTP_OK) or 304 (HTTP_CACHED)\r\n        if (this.isSuccess()) {\r\n          this.dispatchEvent(goog.net.EventType.COMPLETE);\r\n          this.dispatchEvent(goog.net.EventType.SUCCESS);\r\n        } else {\r\n          this.lastErrorCode_ = goog.net.ErrorCode.HTTP_ERROR;\r\n          this.lastError_ =\r\n              this.getStatusText() + ' [' + this.getStatus() + ']';\r\n          this.dispatchErrors_();\r\n        }\r\n      } finally {\r\n        this.cleanUpXhr_();\r\n      }\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Internal handler for the XHR object's onprogress event. Fires both a generic\r\n * PROGRESS event and either a DOWNLOAD_PROGRESS or UPLOAD_PROGRESS event to\r\n * allow specific binding for each XHR progress event.\r\n * @param {!ProgressEvent} e XHR progress event.\r\n * @param {boolean=} opt_isDownload Whether the current progress event is from a\r\n *     download. Used to determine whether DOWNLOAD_PROGRESS or UPLOAD_PROGRESS\r\n *     event should be dispatched.\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.onProgressHandler_ = function(e, opt_isDownload) {\r\n  goog.asserts.assert(\r\n      e.type === goog.net.EventType.PROGRESS,\r\n      'goog.net.EventType.PROGRESS is of the same type as raw XHR progress.');\r\n  this.dispatchEvent(\r\n      goog.net.XhrIo.buildProgressEvent_(e, goog.net.EventType.PROGRESS));\r\n  this.dispatchEvent(\r\n      goog.net.XhrIo.buildProgressEvent_(\r\n          e, opt_isDownload ? goog.net.EventType.DOWNLOAD_PROGRESS :\r\n                              goog.net.EventType.UPLOAD_PROGRESS));\r\n};\r\n\r\n\r\n/**\r\n * Creates a representation of the native ProgressEvent. IE doesn't support\r\n * constructing ProgressEvent via \"new\", and the alternatives (e.g.,\r\n * ProgressEvent.initProgressEvent) are non-standard or deprecated.\r\n * @param {!ProgressEvent} e XHR progress event.\r\n * @param {!goog.net.EventType} eventType The type of the event.\r\n * @return {!ProgressEvent} The progress event.\r\n * @private\r\n */\r\ngoog.net.XhrIo.buildProgressEvent_ = function(e, eventType) {\r\n  return /** @type {!ProgressEvent} */ ({\r\n    type: eventType,\r\n    lengthComputable: e.lengthComputable,\r\n    loaded: e.loaded,\r\n    total: e.total\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Remove the listener to protect against leaks, and nullify the XMLHttpRequest\r\n * object.\r\n * @param {boolean=} opt_fromDispose If this is from the dispose (don't want to\r\n *     fire any events).\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.cleanUpXhr_ = function(opt_fromDispose) {\r\n  if (this.xhr_) {\r\n    // Cancel any pending timeout event handler.\r\n    this.cleanUpTimeoutTimer_();\r\n\r\n    // Save reference so we can mark it as closed after the READY event.  The\r\n    // READY event may trigger another request, thus we must nullify this.xhr_\r\n    var xhr = this.xhr_;\r\n    var clearedOnReadyStateChange =\r\n        this.xhrOptions_[goog.net.XmlHttp.OptionType.USE_NULL_FUNCTION] ?\r\n        goog.nullFunction :\r\n        null;\r\n    this.xhr_ = null;\r\n    this.xhrOptions_ = null;\r\n\r\n    if (!opt_fromDispose) {\r\n      this.dispatchEvent(goog.net.EventType.READY);\r\n    }\r\n\r\n    try {\r\n      // NOTE(user): Not nullifying in FireFox can still leak if the callbacks\r\n      // are defined in the same scope as the instance of XhrIo. But, IE doesn't\r\n      // allow you to set the onreadystatechange to NULL so nullFunction is\r\n      // used.\r\n      xhr.onreadystatechange = clearedOnReadyStateChange;\r\n    } catch (e) {\r\n      // This seems to occur with a Gears HTTP request. Delayed the setting of\r\n      // this onreadystatechange until after READY is sent out and catching the\r\n      // error to see if we can track down the problem.\r\n      goog.log.error(\r\n          this.logger_,\r\n          'Problem encountered resetting onreadystatechange: ' + e.message);\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Make sure the timeout timer isn't running.\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.cleanUpTimeoutTimer_ = function() {\r\n  if (this.xhr_ && this.useXhr2Timeout_) {\r\n    this.xhr_[goog.net.XhrIo.XHR2_ON_TIMEOUT_] = null;\r\n  }\r\n  if (this.timeoutId_) {\r\n    goog.Timer.clear(this.timeoutId_);\r\n    this.timeoutId_ = null;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether there is an active request.\r\n */\r\ngoog.net.XhrIo.prototype.isActive = function() {\r\n  return !!this.xhr_;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the request has completed.\r\n */\r\ngoog.net.XhrIo.prototype.isComplete = function() {\r\n  return this.getReadyState() == goog.net.XmlHttp.ReadyState.COMPLETE;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the request completed with a success.\r\n */\r\ngoog.net.XhrIo.prototype.isSuccess = function() {\r\n  var status = this.getStatus();\r\n  // A zero status code is considered successful for local files.\r\n  return goog.net.HttpStatus.isSuccess(status) ||\r\n      status === 0 && !this.isLastUriEffectiveSchemeHttp_();\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} whether the effective scheme of the last URI that was\r\n *     fetched was 'http' or 'https'.\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.isLastUriEffectiveSchemeHttp_ = function() {\r\n  var scheme = goog.uri.utils.getEffectiveScheme(String(this.lastUri_));\r\n  return goog.net.XhrIo.HTTP_SCHEME_PATTERN.test(scheme);\r\n};\r\n\r\n\r\n/**\r\n * Get the readystate from the Xhr object\r\n * Will only return correct result when called from the context of a callback\r\n * @return {goog.net.XmlHttp.ReadyState} goog.net.XmlHttp.ReadyState.*.\r\n */\r\ngoog.net.XhrIo.prototype.getReadyState = function() {\r\n  return this.xhr_ ?\r\n      /** @type {goog.net.XmlHttp.ReadyState} */ (this.xhr_.readyState) :\r\n                                                 goog.net.XmlHttp.ReadyState\r\n                                                     .UNINITIALIZED;\r\n};\r\n\r\n\r\n/**\r\n * Get the status from the Xhr object\r\n * Will only return correct result when called from the context of a callback\r\n * @return {number} Http status.\r\n */\r\ngoog.net.XhrIo.prototype.getStatus = function() {\r\n  /**\r\n   * IE doesn't like you checking status until the readystate is greater than 2\r\n   * (i.e. it is receiving or complete).  The try/catch is used for when the\r\n   * page is unloading and an ERROR_NOT_AVAILABLE may occur when accessing xhr_.\r\n   */\r\n  try {\r\n    return this.getReadyState() > goog.net.XmlHttp.ReadyState.LOADED ?\r\n        this.xhr_.status :\r\n        -1;\r\n  } catch (e) {\r\n    return -1;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Get the status text from the Xhr object\r\n * Will only return correct result when called from the context of a callback\r\n * @return {string} Status text.\r\n */\r\ngoog.net.XhrIo.prototype.getStatusText = function() {\r\n  /**\r\n   * IE doesn't like you checking status until the readystate is greater than 2\r\n   * (i.e. it is receiving or complete).  The try/catch is used for when the\r\n   * page is unloading and an ERROR_NOT_AVAILABLE may occur when accessing xhr_.\r\n   */\r\n  try {\r\n    return this.getReadyState() > goog.net.XmlHttp.ReadyState.LOADED ?\r\n        this.xhr_.statusText :\r\n        '';\r\n  } catch (e) {\r\n    goog.log.fine(this.logger_, 'Can not get status: ' + e.message);\r\n    return '';\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Get the last Uri that was requested\r\n * @return {string} Last Uri.\r\n */\r\ngoog.net.XhrIo.prototype.getLastUri = function() {\r\n  return String(this.lastUri_);\r\n};\r\n\r\n\r\n/**\r\n * Get the response text from the Xhr object\r\n * Will only return correct result when called from the context of a callback.\r\n * @return {string} Result from the server, or '' if no result available.\r\n */\r\ngoog.net.XhrIo.prototype.getResponseText = function() {\r\n  try {\r\n    return this.xhr_ ? this.xhr_.responseText : '';\r\n  } catch (e) {\r\n    // http://www.w3.org/TR/XMLHttpRequest/#the-responsetext-attribute\r\n    // states that responseText should return '' (and responseXML null)\r\n    // when the state is not LOADING or DONE. Instead, IE can\r\n    // throw unexpected exceptions, for example when a request is aborted\r\n    // or no data is available yet.\r\n    goog.log.fine(this.logger_, 'Can not get responseText: ' + e.message);\r\n    return '';\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Get the response body from the Xhr object. This property is only available\r\n * in IE since version 7 according to MSDN:\r\n * http://msdn.microsoft.com/en-us/library/ie/ms534368(v=vs.85).aspx\r\n * Will only return correct result when called from the context of a callback.\r\n *\r\n * One option is to construct a VBArray from the returned object and convert\r\n * it to a JavaScript array using the toArray method:\r\n * `(new window['VBArray'](xhrIo.getResponseBody())).toArray()`\r\n * This will result in an array of numbers in the range of [0..255]\r\n *\r\n * Another option is to use the VBScript CStr method to convert it into a\r\n * string as outlined in http://stackoverflow.com/questions/1919972\r\n *\r\n * @return {Object} Binary result from the server or null if not available.\r\n */\r\ngoog.net.XhrIo.prototype.getResponseBody = function() {\r\n  try {\r\n    if (this.xhr_ && 'responseBody' in this.xhr_) {\r\n      return this.xhr_['responseBody'];\r\n    }\r\n  } catch (e) {\r\n    // IE can throw unexpected exceptions, for example when a request is aborted\r\n    // or no data is yet available.\r\n    goog.log.fine(this.logger_, 'Can not get responseBody: ' + e.message);\r\n  }\r\n  return null;\r\n};\r\n\r\n\r\n/**\r\n * Get the response XML from the Xhr object\r\n * Will only return correct result when called from the context of a callback.\r\n * @return {Document} The DOM Document representing the XML file, or null\r\n * if no result available.\r\n */\r\ngoog.net.XhrIo.prototype.getResponseXml = function() {\r\n  try {\r\n    return this.xhr_ ? this.xhr_.responseXML : null;\r\n  } catch (e) {\r\n    goog.log.fine(this.logger_, 'Can not get responseXML: ' + e.message);\r\n    return null;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Get the response and evaluates it as JSON from the Xhr object\r\n * Will only return correct result when called from the context of a callback\r\n * @param {string=} opt_xssiPrefix Optional XSSI prefix string to use for\r\n *     stripping of the response before parsing. This needs to be set only if\r\n *     your backend server prepends the same prefix string to the JSON response.\r\n * @throws Error if the response text is invalid JSON.\r\n * @return {Object|undefined} JavaScript object.\r\n */\r\ngoog.net.XhrIo.prototype.getResponseJson = function(opt_xssiPrefix) {\r\n  if (!this.xhr_) {\r\n    return undefined;\r\n  }\r\n\r\n  var responseText = this.xhr_.responseText;\r\n  if (opt_xssiPrefix && responseText.indexOf(opt_xssiPrefix) == 0) {\r\n    responseText = responseText.substring(opt_xssiPrefix.length);\r\n  }\r\n\r\n  return goog.json.hybrid.parse(responseText);\r\n};\r\n\r\n\r\n/**\r\n * Get the response as the type specificed by {@link #setResponseType}. At time\r\n * of writing, this is only directly supported in very recent versions of WebKit\r\n * (10.0.612.1 dev and later). If the field is not supported directly, we will\r\n * try to emulate it.\r\n *\r\n * Emulating the response means following the rules laid out at\r\n * http://www.w3.org/TR/XMLHttpRequest/#the-response-attribute\r\n *\r\n * On browsers with no support for this (Chrome < 10, Firefox < 4, etc), only\r\n * response types of DEFAULT or TEXT may be used, and the response returned will\r\n * be the text response.\r\n *\r\n * On browsers with Mozilla's draft support for array buffers (Firefox 4, 5),\r\n * only response types of DEFAULT, TEXT, and ARRAY_BUFFER may be used, and the\r\n * response returned will be either the text response or the Mozilla\r\n * implementation of the array buffer response.\r\n *\r\n * On browsers will full support, any valid response type supported by the\r\n * browser may be used, and the response provided by the browser will be\r\n * returned.\r\n *\r\n * @return {*} The response.\r\n */\r\ngoog.net.XhrIo.prototype.getResponse = function() {\r\n  try {\r\n    if (!this.xhr_) {\r\n      return null;\r\n    }\r\n    if ('response' in this.xhr_) {\r\n      return this.xhr_.response;\r\n    }\r\n    switch (this.responseType_) {\r\n      case ResponseType.DEFAULT:\r\n      case ResponseType.TEXT:\r\n        return this.xhr_.responseText;\r\n      // DOCUMENT and BLOB don't need to be handled here because they are\r\n      // introduced in the same spec that adds the .response field, and would\r\n      // have been caught above.\r\n      // ARRAY_BUFFER needs an implementation for Firefox 4, where it was\r\n      // implemented using a draft spec rather than the final spec.\r\n      case ResponseType.ARRAY_BUFFER:\r\n        if ('mozResponseArrayBuffer' in this.xhr_) {\r\n          return this.xhr_.mozResponseArrayBuffer;\r\n        }\r\n    }\r\n    // Fell through to a response type that is not supported on this browser.\r\n    goog.log.error(\r\n        this.logger_, 'Response type ' + this.responseType_ + ' is not ' +\r\n            'supported on this browser');\r\n    return null;\r\n  } catch (e) {\r\n    goog.log.fine(this.logger_, 'Can not get response: ' + e.message);\r\n    return null;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Get the value of the response-header with the given name from the Xhr object\r\n * Will only return correct result when called from the context of a callback\r\n * and the request has completed\r\n * @param {string} key The name of the response-header to retrieve.\r\n * @return {string|undefined} The value of the response-header named key.\r\n */\r\ngoog.net.XhrIo.prototype.getResponseHeader = function(key) {\r\n  if (!this.xhr_ || !this.isComplete()) {\r\n    return undefined;\r\n  }\r\n\r\n  var value = this.xhr_.getResponseHeader(key);\r\n  return goog.isNull(value) ? undefined : value;\r\n};\r\n\r\n\r\n/**\r\n * Gets the text of all the headers in the response.\r\n * Will only return correct result when called from the context of a callback\r\n * and the request has completed.\r\n * @return {string} The value of the response headers or empty string.\r\n */\r\ngoog.net.XhrIo.prototype.getAllResponseHeaders = function() {\r\n  // getAllResponseHeaders can return null if no response has been received,\r\n  // ensure we always return an empty string.\r\n  return this.xhr_ && this.isComplete() ?\r\n      (this.xhr_.getAllResponseHeaders() || '') :\r\n      '';\r\n};\r\n\r\n\r\n/**\r\n * Returns all response headers as a key-value map.\r\n * Multiple values for the same header key can be combined into one,\r\n * separated by a comma and a space.\r\n * Note that the native getResponseHeader method for retrieving a single header\r\n * does a case insensitive match on the header name. This method does not\r\n * include any case normalization logic, it will just return a key-value\r\n * representation of the headers.\r\n * See: http://www.w3.org/TR/XMLHttpRequest/#the-getresponseheader()-method\r\n * @return {!Object<string, string>} An object with the header keys as keys\r\n *     and header values as values.\r\n */\r\ngoog.net.XhrIo.prototype.getResponseHeaders = function() {\r\n  // TODO(b/120371595): Make this function parse headers as per the spec\r\n  // (https://tools.ietf.org/html/rfc2616#section-4.2).\r\n\r\n  var headersObject = {};\r\n  var headersArray = this.getAllResponseHeaders().split('\\r\\n');\r\n  for (var i = 0; i < headersArray.length; i++) {\r\n    if (goog.string.isEmptyOrWhitespace(headersArray[i])) {\r\n      continue;\r\n    }\r\n    var keyValue =\r\n        goog.string.splitLimit(headersArray[i], ':', /* maxSplitCount= */ 1);\r\n    var key = keyValue[0];\r\n    var value = keyValue[1];\r\n\r\n    if (!goog.isString(value)) {\r\n      // There must be a value but it can be the empty string.\r\n      continue;\r\n    }\r\n\r\n    // Whitespace at the start and end of the value is meaningless.\r\n    value = value.trim();\r\n    // The key should not contain whitespace but we currently ignore that.\r\n\r\n    var values = headersObject[key] || [];\r\n    headersObject[key] = values;\r\n    values.push(value);\r\n  }\r\n\r\n  return goog.object.map(headersObject, function(values) {\r\n    return values.join(', ');\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Get the value of the response-header with the given name from the Xhr object.\r\n * As opposed to {@link #getResponseHeader}, this method does not require that\r\n * the request has completed.\r\n * @param {string} key The name of the response-header to retrieve.\r\n * @return {?string} The value of the response-header, or null if it is\r\n *     unavailable.\r\n */\r\ngoog.net.XhrIo.prototype.getStreamingResponseHeader = function(key) {\r\n  return this.xhr_ ? this.xhr_.getResponseHeader(key) : null;\r\n};\r\n\r\n\r\n/**\r\n * Gets the text of all the headers in the response. As opposed to\r\n * {@link #getAllResponseHeaders}, this method does not require that the request\r\n * has completed.\r\n * @return {string} The value of the response headers or empty string.\r\n */\r\ngoog.net.XhrIo.prototype.getAllStreamingResponseHeaders = function() {\r\n  return this.xhr_ ? this.xhr_.getAllResponseHeaders() : '';\r\n};\r\n\r\n\r\n/**\r\n * Get the last error message\r\n * @return {!goog.net.ErrorCode} Last error code.\r\n */\r\ngoog.net.XhrIo.prototype.getLastErrorCode = function() {\r\n  return this.lastErrorCode_;\r\n};\r\n\r\n\r\n/**\r\n * Get the last error message\r\n * @return {string} Last error message.\r\n */\r\ngoog.net.XhrIo.prototype.getLastError = function() {\r\n  return goog.isString(this.lastError_) ? this.lastError_ :\r\n                                          String(this.lastError_);\r\n};\r\n\r\n\r\n/**\r\n * Adds the last method, status and URI to the message.  This is used to add\r\n * this information to the logging calls.\r\n * @param {string} msg The message text that we want to add the extra text to.\r\n * @return {string} The message with the extra text appended.\r\n * @private\r\n */\r\ngoog.net.XhrIo.prototype.formatMsg_ = function(msg) {\r\n  return msg + ' [' + this.lastMethod_ + ' ' + this.lastUri_ + ' ' +\r\n      this.getStatus() + ']';\r\n};\r\n\r\n\r\n// Register the xhr handler as an entry point, so that\r\n// it can be monitored for exception handling, etc.\r\ngoog.debug.entryPointRegistry.register(\r\n    /**\r\n     * @param {function(!Function): !Function} transformer The transforming\r\n     *     function.\r\n     */\r\n    function(transformer) {\r\n      goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_ =\r\n          transformer(goog.net.XhrIo.prototype.onReadyStateChangeEntryPoint_);\r\n    });\r\n});  // goog.scope\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview String functions called from Closure packages that couldn't\r\n * depend on each other. Outside Closure, use goog.string function which\r\n * delegate to these.\r\n */\r\n\r\n\r\ngoog.provide('goog.string.internal');\r\n\r\n\r\n/**\r\n * Fast prefix-checker.\r\n * @param {string} str The string to check.\r\n * @param {string} prefix A string to look for at the start of `str`.\r\n * @return {boolean} True if `str` begins with `prefix`.\r\n * @see goog.string.startsWith\r\n */\r\ngoog.string.internal.startsWith = function(str, prefix) {\r\n  return str.lastIndexOf(prefix, 0) == 0;\r\n};\r\n\r\n\r\n/**\r\n * Fast suffix-checker.\r\n * @param {string} str The string to check.\r\n * @param {string} suffix A string to look for at the end of `str`.\r\n * @return {boolean} True if `str` ends with `suffix`.\r\n * @see goog.string.endsWith\r\n */\r\ngoog.string.internal.endsWith = function(str, suffix) {\r\n  var l = str.length - suffix.length;\r\n  return l >= 0 && str.indexOf(suffix, l) == l;\r\n};\r\n\r\n\r\n/**\r\n * Case-insensitive prefix-checker.\r\n * @param {string} str The string to check.\r\n * @param {string} prefix  A string to look for at the end of `str`.\r\n * @return {boolean} True if `str` begins with `prefix` (ignoring\r\n *     case).\r\n * @see goog.string.caseInsensitiveStartsWith\r\n */\r\ngoog.string.internal.caseInsensitiveStartsWith = function(str, prefix) {\r\n  return goog.string.internal.caseInsensitiveCompare(\r\n             prefix, str.substr(0, prefix.length)) == 0;\r\n};\r\n\r\n\r\n/**\r\n * Case-insensitive suffix-checker.\r\n * @param {string} str The string to check.\r\n * @param {string} suffix A string to look for at the end of `str`.\r\n * @return {boolean} True if `str` ends with `suffix` (ignoring\r\n *     case).\r\n * @see goog.string.caseInsensitiveEndsWith\r\n */\r\ngoog.string.internal.caseInsensitiveEndsWith = function(str, suffix) {\r\n  return (\r\n      goog.string.internal.caseInsensitiveCompare(\r\n          suffix, str.substr(str.length - suffix.length, suffix.length)) == 0);\r\n};\r\n\r\n\r\n/**\r\n * Case-insensitive equality checker.\r\n * @param {string} str1 First string to check.\r\n * @param {string} str2 Second string to check.\r\n * @return {boolean} True if `str1` and `str2` are the same string,\r\n *     ignoring case.\r\n * @see goog.string.caseInsensitiveEquals\r\n */\r\ngoog.string.internal.caseInsensitiveEquals = function(str1, str2) {\r\n  return str1.toLowerCase() == str2.toLowerCase();\r\n};\r\n\r\n\r\n/**\r\n * Checks if a string is empty or contains only whitespaces.\r\n * @param {string} str The string to check.\r\n * @return {boolean} Whether `str` is empty or whitespace only.\r\n * @see goog.string.isEmptyOrWhitespace\r\n */\r\ngoog.string.internal.isEmptyOrWhitespace = function(str) {\r\n  // testing length == 0 first is actually slower in all browsers (about the\r\n  // same in Opera).\r\n  // Since IE doesn't include non-breaking-space (0xa0) in their \\s character\r\n  // class (as required by section 7.2 of the ECMAScript spec), we explicitly\r\n  // include it in the regexp to enforce consistent cross-browser behavior.\r\n  return /^[\\s\\xa0]*$/.test(str);\r\n};\r\n\r\n\r\n/**\r\n * Trims white spaces to the left and right of a string.\r\n * @param {string} str The string to trim.\r\n * @return {string} A trimmed copy of `str`.\r\n */\r\ngoog.string.internal.trim =\r\n    (goog.TRUSTED_SITE && String.prototype.trim) ? function(str) {\r\n      return str.trim();\r\n    } : function(str) {\r\n      // Since IE doesn't include non-breaking-space (0xa0) in their \\s\r\n      // character class (as required by section 7.2 of the ECMAScript spec),\r\n      // we explicitly include it in the regexp to enforce consistent\r\n      // cross-browser behavior.\r\n      // NOTE: We don't use String#replace because it might have side effects\r\n      // causing this function to not compile to 0 bytes.\r\n      return /^[\\s\\xa0]*([\\s\\S]*?)[\\s\\xa0]*$/.exec(str)[1];\r\n    };\r\n\r\n\r\n/**\r\n * A string comparator that ignores case.\r\n * -1 = str1 less than str2\r\n *  0 = str1 equals str2\r\n *  1 = str1 greater than str2\r\n *\r\n * @param {string} str1 The string to compare.\r\n * @param {string} str2 The string to compare `str1` to.\r\n * @return {number} The comparator result, as described above.\r\n * @see goog.string.caseInsensitiveCompare\r\n */\r\ngoog.string.internal.caseInsensitiveCompare = function(str1, str2) {\r\n  var test1 = String(str1).toLowerCase();\r\n  var test2 = String(str2).toLowerCase();\r\n\r\n  if (test1 < test2) {\r\n    return -1;\r\n  } else if (test1 == test2) {\r\n    return 0;\r\n  } else {\r\n    return 1;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Converts \\n to <br>s or <br />s.\r\n * @param {string} str The string in which to convert newlines.\r\n * @param {boolean=} opt_xml Whether to use XML compatible tags.\r\n * @return {string} A copy of `str` with converted newlines.\r\n * @see goog.string.newLineToBr\r\n */\r\ngoog.string.internal.newLineToBr = function(str, opt_xml) {\r\n  return str.replace(/(\\r\\n|\\r|\\n)/g, opt_xml ? '<br />' : '<br>');\r\n};\r\n\r\n\r\n/**\r\n * Escapes double quote '\"' and single quote '\\'' characters in addition to\r\n * '&', '<', and '>' so that a string can be included in an HTML tag attribute\r\n * value within double or single quotes.\r\n * @param {string} str string to be escaped.\r\n * @param {boolean=} opt_isLikelyToContainHtmlChars\r\n * @return {string} An escaped copy of `str`.\r\n * @see goog.string.htmlEscape\r\n */\r\ngoog.string.internal.htmlEscape = function(\r\n    str, opt_isLikelyToContainHtmlChars) {\r\n  if (opt_isLikelyToContainHtmlChars) {\r\n    str = str.replace(goog.string.internal.AMP_RE_, '&amp;')\r\n              .replace(goog.string.internal.LT_RE_, '&lt;')\r\n              .replace(goog.string.internal.GT_RE_, '&gt;')\r\n              .replace(goog.string.internal.QUOT_RE_, '&quot;')\r\n              .replace(goog.string.internal.SINGLE_QUOTE_RE_, '&#39;')\r\n              .replace(goog.string.internal.NULL_RE_, '&#0;');\r\n    return str;\r\n\r\n  } else {\r\n    // quick test helps in the case when there are no chars to replace, in\r\n    // worst case this makes barely a difference to the time taken\r\n    if (!goog.string.internal.ALL_RE_.test(str)) return str;\r\n\r\n    // str.indexOf is faster than regex.test in this case\r\n    if (str.indexOf('&') != -1) {\r\n      str = str.replace(goog.string.internal.AMP_RE_, '&amp;');\r\n    }\r\n    if (str.indexOf('<') != -1) {\r\n      str = str.replace(goog.string.internal.LT_RE_, '&lt;');\r\n    }\r\n    if (str.indexOf('>') != -1) {\r\n      str = str.replace(goog.string.internal.GT_RE_, '&gt;');\r\n    }\r\n    if (str.indexOf('\"') != -1) {\r\n      str = str.replace(goog.string.internal.QUOT_RE_, '&quot;');\r\n    }\r\n    if (str.indexOf('\\'') != -1) {\r\n      str = str.replace(goog.string.internal.SINGLE_QUOTE_RE_, '&#39;');\r\n    }\r\n    if (str.indexOf('\\x00') != -1) {\r\n      str = str.replace(goog.string.internal.NULL_RE_, '&#0;');\r\n    }\r\n    return str;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Regular expression that matches an ampersand, for use in escaping.\r\n * @const {!RegExp}\r\n * @private\r\n */\r\ngoog.string.internal.AMP_RE_ = /&/g;\r\n\r\n\r\n/**\r\n * Regular expression that matches a less than sign, for use in escaping.\r\n * @const {!RegExp}\r\n * @private\r\n */\r\ngoog.string.internal.LT_RE_ = /</g;\r\n\r\n\r\n/**\r\n * Regular expression that matches a greater than sign, for use in escaping.\r\n * @const {!RegExp}\r\n * @private\r\n */\r\ngoog.string.internal.GT_RE_ = />/g;\r\n\r\n\r\n/**\r\n * Regular expression that matches a double quote, for use in escaping.\r\n * @const {!RegExp}\r\n * @private\r\n */\r\ngoog.string.internal.QUOT_RE_ = /\"/g;\r\n\r\n\r\n/**\r\n * Regular expression that matches a single quote, for use in escaping.\r\n * @const {!RegExp}\r\n * @private\r\n */\r\ngoog.string.internal.SINGLE_QUOTE_RE_ = /'/g;\r\n\r\n\r\n/**\r\n * Regular expression that matches null character, for use in escaping.\r\n * @const {!RegExp}\r\n * @private\r\n */\r\ngoog.string.internal.NULL_RE_ = /\\x00/g;\r\n\r\n\r\n/**\r\n * Regular expression that matches any character that needs to be escaped.\r\n * @const {!RegExp}\r\n * @private\r\n */\r\ngoog.string.internal.ALL_RE_ = /[\\x00&<>\"']/;\r\n\r\n\r\n/**\r\n * Do escaping of whitespace to preserve spatial formatting. We use character\r\n * entity #160 to make it safer for xml.\r\n * @param {string} str The string in which to escape whitespace.\r\n * @param {boolean=} opt_xml Whether to use XML compatible tags.\r\n * @return {string} An escaped copy of `str`.\r\n * @see goog.string.whitespaceEscape\r\n */\r\ngoog.string.internal.whitespaceEscape = function(str, opt_xml) {\r\n  // This doesn't use goog.string.preserveSpaces for backwards compatibility.\r\n  return goog.string.internal.newLineToBr(\r\n      str.replace(/  /g, ' &#160;'), opt_xml);\r\n};\r\n\r\n\r\n/**\r\n * Determines whether a string contains a substring.\r\n * @param {string} str The string to search.\r\n * @param {string} subString The substring to search for.\r\n * @return {boolean} Whether `str` contains `subString`.\r\n * @see goog.string.contains\r\n */\r\ngoog.string.internal.contains = function(str, subString) {\r\n  return str.indexOf(subString) != -1;\r\n};\r\n\r\n\r\n/**\r\n * Determines whether a string contains a substring, ignoring case.\r\n * @param {string} str The string to search.\r\n * @param {string} subString The substring to search for.\r\n * @return {boolean} Whether `str` contains `subString`.\r\n * @see goog.string.caseInsensitiveContains\r\n */\r\ngoog.string.internal.caseInsensitiveContains = function(str, subString) {\r\n  return goog.string.internal.contains(\r\n      str.toLowerCase(), subString.toLowerCase());\r\n};\r\n\r\n\r\n/**\r\n * Compares two version numbers.\r\n *\r\n * @param {string|number} version1 Version of first item.\r\n * @param {string|number} version2 Version of second item.\r\n *\r\n * @return {number}  1 if `version1` is higher.\r\n *                   0 if arguments are equal.\r\n *                  -1 if `version2` is higher.\r\n * @see goog.string.compareVersions\r\n */\r\ngoog.string.internal.compareVersions = function(version1, version2) {\r\n  var order = 0;\r\n  // Trim leading and trailing whitespace and split the versions into\r\n  // subversions.\r\n  var v1Subs = goog.string.internal.trim(String(version1)).split('.');\r\n  var v2Subs = goog.string.internal.trim(String(version2)).split('.');\r\n  var subCount = Math.max(v1Subs.length, v2Subs.length);\r\n\r\n  // Iterate over the subversions, as long as they appear to be equivalent.\r\n  for (var subIdx = 0; order == 0 && subIdx < subCount; subIdx++) {\r\n    var v1Sub = v1Subs[subIdx] || '';\r\n    var v2Sub = v2Subs[subIdx] || '';\r\n\r\n    do {\r\n      // Split the subversions into pairs of numbers and qualifiers (like 'b').\r\n      // Two different RegExp objects are use to make it clear the code\r\n      // is side-effect free\r\n      var v1Comp = /(\\d*)(\\D*)(.*)/.exec(v1Sub) || ['', '', '', ''];\r\n      var v2Comp = /(\\d*)(\\D*)(.*)/.exec(v2Sub) || ['', '', '', ''];\r\n      // Break if there are no more matches.\r\n      if (v1Comp[0].length == 0 && v2Comp[0].length == 0) {\r\n        break;\r\n      }\r\n\r\n      // Parse the numeric part of the subversion. A missing number is\r\n      // equivalent to 0.\r\n      var v1CompNum = v1Comp[1].length == 0 ? 0 : parseInt(v1Comp[1], 10);\r\n      var v2CompNum = v2Comp[1].length == 0 ? 0 : parseInt(v2Comp[1], 10);\r\n\r\n      // Compare the subversion components. The number has the highest\r\n      // precedence. Next, if the numbers are equal, a subversion without any\r\n      // qualifier is always higher than a subversion with any qualifier. Next,\r\n      // the qualifiers are compared as strings.\r\n      order = goog.string.internal.compareElements_(v1CompNum, v2CompNum) ||\r\n          goog.string.internal.compareElements_(\r\n              v1Comp[2].length == 0, v2Comp[2].length == 0) ||\r\n          goog.string.internal.compareElements_(v1Comp[2], v2Comp[2]);\r\n      // Stop as soon as an inequality is discovered.\r\n\r\n      v1Sub = v1Comp[3];\r\n      v2Sub = v2Comp[3];\r\n    } while (order == 0);\r\n  }\r\n\r\n  return order;\r\n};\r\n\r\n\r\n/**\r\n * Compares elements of a version number.\r\n *\r\n * @param {string|number|boolean} left An element from a version number.\r\n * @param {string|number|boolean} right An element from a version number.\r\n *\r\n * @return {number}  1 if `left` is higher.\r\n *                   0 if arguments are equal.\r\n *                  -1 if `right` is higher.\r\n * @private\r\n */\r\ngoog.string.internal.compareElements_ = function(left, right) {\r\n  if (left < right) {\r\n    return -1;\r\n  } else if (left > right) {\r\n    return 1;\r\n  }\r\n  return 0;\r\n};\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Utilities used by goog.labs.userAgent tools. These functions\r\n * should not be used outside of goog.labs.userAgent.*.\r\n *\r\n * @author nnaze@google.com (Nathan Naze)\r\n */\r\n\r\ngoog.provide('goog.labs.userAgent.util');\r\n\r\ngoog.require('goog.string.internal');\r\n\r\n\r\n/**\r\n * Gets the native userAgent string from navigator if it exists.\r\n * If navigator or navigator.userAgent string is missing, returns an empty\r\n * string.\r\n * @return {string}\r\n * @private\r\n */\r\ngoog.labs.userAgent.util.getNativeUserAgentString_ = function() {\r\n  var navigator = goog.labs.userAgent.util.getNavigator_();\r\n  if (navigator) {\r\n    var userAgent = navigator.userAgent;\r\n    if (userAgent) {\r\n      return userAgent;\r\n    }\r\n  }\r\n  return '';\r\n};\r\n\r\n\r\n/**\r\n * Getter for the native navigator.\r\n * This is a separate function so it can be stubbed out in testing.\r\n * @return {Navigator}\r\n * @private\r\n */\r\ngoog.labs.userAgent.util.getNavigator_ = function() {\r\n  return goog.global.navigator;\r\n};\r\n\r\n\r\n/**\r\n * A possible override for applications which wish to not check\r\n * navigator.userAgent but use a specified value for detection instead.\r\n * @private {string}\r\n */\r\ngoog.labs.userAgent.util.userAgent_ =\r\n    goog.labs.userAgent.util.getNativeUserAgentString_();\r\n\r\n\r\n/**\r\n * Applications may override browser detection on the built in\r\n * navigator.userAgent object by setting this string. Set to null to use the\r\n * browser object instead.\r\n * @param {?string=} opt_userAgent The User-Agent override.\r\n */\r\ngoog.labs.userAgent.util.setUserAgent = function(opt_userAgent) {\r\n  goog.labs.userAgent.util.userAgent_ =\r\n      opt_userAgent || goog.labs.userAgent.util.getNativeUserAgentString_();\r\n};\r\n\r\n\r\n/**\r\n * @return {string} The user agent string.\r\n */\r\ngoog.labs.userAgent.util.getUserAgent = function() {\r\n  return goog.labs.userAgent.util.userAgent_;\r\n};\r\n\r\n\r\n/**\r\n * @param {string} str\r\n * @return {boolean} Whether the user agent contains the given string.\r\n */\r\ngoog.labs.userAgent.util.matchUserAgent = function(str) {\r\n  var userAgent = goog.labs.userAgent.util.getUserAgent();\r\n  return goog.string.internal.contains(userAgent, str);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} str\r\n * @return {boolean} Whether the user agent contains the given string, ignoring\r\n *     case.\r\n */\r\ngoog.labs.userAgent.util.matchUserAgentIgnoreCase = function(str) {\r\n  var userAgent = goog.labs.userAgent.util.getUserAgent();\r\n  return goog.string.internal.caseInsensitiveContains(userAgent, str);\r\n};\r\n\r\n\r\n/**\r\n * Parses the user agent into tuples for each section.\r\n * @param {string} userAgent\r\n * @return {!Array<!Array<string>>} Tuples of key, version, and the contents\r\n *     of the parenthetical.\r\n */\r\ngoog.labs.userAgent.util.extractVersionTuples = function(userAgent) {\r\n  // Matches each section of a user agent string.\r\n  // Example UA:\r\n  // Mozilla/5.0 (iPad; U; CPU OS 3_2_1 like Mac OS X; en-us)\r\n  // AppleWebKit/531.21.10 (KHTML, like Gecko) Mobile/7B405\r\n  // This has three version tuples: Mozilla, AppleWebKit, and Mobile.\r\n\r\n  var versionRegExp = new RegExp(\r\n      // Key. Note that a key may have a space.\r\n      // (i.e. 'Mobile Safari' in 'Mobile Safari/5.0')\r\n      '(\\\\w[\\\\w ]+)' +\r\n\r\n          '/' +                // slash\r\n          '([^\\\\s]+)' +        // version (i.e. '5.0b')\r\n          '\\\\s*' +             // whitespace\r\n          '(?:\\\\((.*?)\\\\))?',  // parenthetical info. parentheses not matched.\r\n      'g');\r\n\r\n  var data = [];\r\n  var match;\r\n\r\n  // Iterate and collect the version tuples.  Each iteration will be the\r\n  // next regex match.\r\n  while (match = versionRegExp.exec(userAgent)) {\r\n    data.push([\r\n      match[1],  // key\r\n      match[2],  // value\r\n      // || undefined as this is not undefined in IE7 and IE8\r\n      match[3] || undefined  // info\r\n    ]);\r\n  }\r\n\r\n  return data;\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Utilities for manipulating objects/maps/hashes.\r\n * @author arv@google.com (Erik Arvidsson)\r\n */\r\n\r\ngoog.provide('goog.object');\r\n\r\n\r\n/**\r\n * Whether two values are not observably distinguishable. This\r\n * correctly detects that 0 is not the same as -0 and two NaNs are\r\n * practically equivalent.\r\n *\r\n * The implementation is as suggested by harmony:egal proposal.\r\n *\r\n * @param {*} v The first value to compare.\r\n * @param {*} v2 The second value to compare.\r\n * @return {boolean} Whether two values are not observably distinguishable.\r\n * @see http://wiki.ecmascript.org/doku.php?id=harmony:egal\r\n */\r\ngoog.object.is = function(v, v2) {\r\n  if (v === v2) {\r\n    // 0 === -0, but they are not identical.\r\n    // We need the cast because the compiler requires that v2 is a\r\n    // number (although 1/v2 works with non-number). We cast to ? to\r\n    // stop the compiler from type-checking this statement.\r\n    return v !== 0 || 1 / v === 1 / /** @type {?} */ (v2);\r\n  }\r\n\r\n  // NaN is non-reflexive: NaN !== NaN, although they are identical.\r\n  return v !== v && v2 !== v2;\r\n};\r\n\r\n\r\n/**\r\n * Calls a function for each element in an object/map/hash.\r\n *\r\n * @param {Object<K,V>} obj The object over which to iterate.\r\n * @param {function(this:T,V,?,Object<K,V>):?} f The function to call\r\n *     for every element. This function takes 3 arguments (the value, the\r\n *     key and the object) and the return value is ignored.\r\n * @param {T=} opt_obj This is used as the 'this' object within f.\r\n * @template T,K,V\r\n */\r\ngoog.object.forEach = function(obj, f, opt_obj) {\r\n  for (var key in obj) {\r\n    f.call(/** @type {?} */ (opt_obj), obj[key], key, obj);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Calls a function for each element in an object/map/hash. If that call returns\r\n * true, adds the element to a new object.\r\n *\r\n * @param {Object<K,V>} obj The object over which to iterate.\r\n * @param {function(this:T,V,?,Object<K,V>):boolean} f The function to call\r\n *     for every element. This\r\n *     function takes 3 arguments (the value, the key and the object)\r\n *     and should return a boolean. If the return value is true the\r\n *     element is added to the result object. If it is false the\r\n *     element is not included.\r\n * @param {T=} opt_obj This is used as the 'this' object within f.\r\n * @return {!Object<K,V>} a new object in which only elements that passed the\r\n *     test are present.\r\n * @template T,K,V\r\n */\r\ngoog.object.filter = function(obj, f, opt_obj) {\r\n  var res = {};\r\n  for (var key in obj) {\r\n    if (f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {\r\n      res[key] = obj[key];\r\n    }\r\n  }\r\n  return res;\r\n};\r\n\r\n\r\n/**\r\n * For every element in an object/map/hash calls a function and inserts the\r\n * result into a new object.\r\n *\r\n * @param {Object<K,V>} obj The object over which to iterate.\r\n * @param {function(this:T,V,?,Object<K,V>):R} f The function to call\r\n *     for every element. This function\r\n *     takes 3 arguments (the value, the key and the object)\r\n *     and should return something. The result will be inserted\r\n *     into a new object.\r\n * @param {T=} opt_obj This is used as the 'this' object within f.\r\n * @return {!Object<K,R>} a new object with the results from f.\r\n * @template T,K,V,R\r\n */\r\ngoog.object.map = function(obj, f, opt_obj) {\r\n  var res = {};\r\n  for (var key in obj) {\r\n    res[key] = f.call(/** @type {?} */ (opt_obj), obj[key], key, obj);\r\n  }\r\n  return res;\r\n};\r\n\r\n\r\n/**\r\n * Calls a function for each element in an object/map/hash. If any\r\n * call returns true, returns true (without checking the rest). If\r\n * all calls return false, returns false.\r\n *\r\n * @param {Object<K,V>} obj The object to check.\r\n * @param {function(this:T,V,?,Object<K,V>):boolean} f The function to\r\n *     call for every element. This function\r\n *     takes 3 arguments (the value, the key and the object) and should\r\n *     return a boolean.\r\n * @param {T=} opt_obj This is used as the 'this' object within f.\r\n * @return {boolean} true if any element passes the test.\r\n * @template T,K,V\r\n */\r\ngoog.object.some = function(obj, f, opt_obj) {\r\n  for (var key in obj) {\r\n    if (f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {\r\n      return true;\r\n    }\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Calls a function for each element in an object/map/hash. If\r\n * all calls return true, returns true. If any call returns false, returns\r\n * false at this point and does not continue to check the remaining elements.\r\n *\r\n * @param {Object<K,V>} obj The object to check.\r\n * @param {?function(this:T,V,?,Object<K,V>):boolean} f The function to\r\n *     call for every element. This function\r\n *     takes 3 arguments (the value, the key and the object) and should\r\n *     return a boolean.\r\n * @param {T=} opt_obj This is used as the 'this' object within f.\r\n * @return {boolean} false if any element fails the test.\r\n * @template T,K,V\r\n */\r\ngoog.object.every = function(obj, f, opt_obj) {\r\n  for (var key in obj) {\r\n    if (!f.call(/** @type {?} */ (opt_obj), obj[key], key, obj)) {\r\n      return false;\r\n    }\r\n  }\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * Returns the number of key-value pairs in the object map.\r\n *\r\n * @param {Object} obj The object for which to get the number of key-value\r\n *     pairs.\r\n * @return {number} The number of key-value pairs in the object map.\r\n */\r\ngoog.object.getCount = function(obj) {\r\n  var rv = 0;\r\n  for (var key in obj) {\r\n    rv++;\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Returns one key from the object map, if any exists.\r\n * For map literals the returned key will be the first one in most of the\r\n * browsers (a know exception is Konqueror).\r\n *\r\n * @param {Object} obj The object to pick a key from.\r\n * @return {string|undefined} The key or undefined if the object is empty.\r\n */\r\ngoog.object.getAnyKey = function(obj) {\r\n  for (var key in obj) {\r\n    return key;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Returns one value from the object map, if any exists.\r\n * For map literals the returned value will be the first one in most of the\r\n * browsers (a know exception is Konqueror).\r\n *\r\n * @param {Object<K,V>} obj The object to pick a value from.\r\n * @return {V|undefined} The value or undefined if the object is empty.\r\n * @template K,V\r\n */\r\ngoog.object.getAnyValue = function(obj) {\r\n  for (var key in obj) {\r\n    return obj[key];\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Whether the object/hash/map contains the given object as a value.\r\n * An alias for goog.object.containsValue(obj, val).\r\n *\r\n * @param {Object<K,V>} obj The object in which to look for val.\r\n * @param {V} val The object for which to check.\r\n * @return {boolean} true if val is present.\r\n * @template K,V\r\n */\r\ngoog.object.contains = function(obj, val) {\r\n  return goog.object.containsValue(obj, val);\r\n};\r\n\r\n\r\n/**\r\n * Returns the values of the object/map/hash.\r\n *\r\n * @param {Object<K,V>} obj The object from which to get the values.\r\n * @return {!Array<V>} The values in the object/map/hash.\r\n * @template K,V\r\n */\r\ngoog.object.getValues = function(obj) {\r\n  var res = [];\r\n  var i = 0;\r\n  for (var key in obj) {\r\n    res[i++] = obj[key];\r\n  }\r\n  return res;\r\n};\r\n\r\n\r\n/**\r\n * Returns the keys of the object/map/hash.\r\n *\r\n * @param {Object} obj The object from which to get the keys.\r\n * @return {!Array<string>} Array of property keys.\r\n */\r\ngoog.object.getKeys = function(obj) {\r\n  var res = [];\r\n  var i = 0;\r\n  for (var key in obj) {\r\n    res[i++] = key;\r\n  }\r\n  return res;\r\n};\r\n\r\n\r\n/**\r\n * Get a value from an object multiple levels deep.  This is useful for\r\n * pulling values from deeply nested objects, such as JSON responses.\r\n * Example usage: getValueByKeys(jsonObj, 'foo', 'entries', 3)\r\n *\r\n * @param {!Object} obj An object to get the value from.  Can be array-like.\r\n * @param {...(string|number|!IArrayLike<number|string>)}\r\n *     var_args A number of keys\r\n *     (as strings, or numbers, for array-like objects).  Can also be\r\n *     specified as a single array of keys.\r\n * @return {*} The resulting value.  If, at any point, the value for a key\r\n *     in the current object is null or undefined, returns undefined.\r\n */\r\ngoog.object.getValueByKeys = function(obj, var_args) {\r\n  var isArrayLike = goog.isArrayLike(var_args);\r\n  var keys = isArrayLike ?\r\n      /** @type {!IArrayLike<number|string>} */ (var_args) :\r\n      arguments;\r\n\r\n  // Start with the 2nd parameter for the variable parameters syntax.\r\n  for (var i = isArrayLike ? 0 : 1; i < keys.length; i++) {\r\n    if (obj == null) return undefined;\r\n    obj = obj[keys[i]];\r\n  }\r\n\r\n  return obj;\r\n};\r\n\r\n\r\n/**\r\n * Whether the object/map/hash contains the given key.\r\n *\r\n * @param {Object} obj The object in which to look for key.\r\n * @param {?} key The key for which to check.\r\n * @return {boolean} true If the map contains the key.\r\n */\r\ngoog.object.containsKey = function(obj, key) {\r\n  return obj !== null && key in obj;\r\n};\r\n\r\n\r\n/**\r\n * Whether the object/map/hash contains the given value. This is O(n).\r\n *\r\n * @param {Object<K,V>} obj The object in which to look for val.\r\n * @param {V} val The value for which to check.\r\n * @return {boolean} true If the map contains the value.\r\n * @template K,V\r\n */\r\ngoog.object.containsValue = function(obj, val) {\r\n  for (var key in obj) {\r\n    if (obj[key] == val) {\r\n      return true;\r\n    }\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Searches an object for an element that satisfies the given condition and\r\n * returns its key.\r\n * @param {Object<K,V>} obj The object to search in.\r\n * @param {function(this:T,V,string,Object<K,V>):boolean} f The\r\n *      function to call for every element. Takes 3 arguments (the value,\r\n *     the key and the object) and should return a boolean.\r\n * @param {T=} opt_this An optional \"this\" context for the function.\r\n * @return {string|undefined} The key of an element for which the function\r\n *     returns true or undefined if no such element is found.\r\n * @template T,K,V\r\n */\r\ngoog.object.findKey = function(obj, f, opt_this) {\r\n  for (var key in obj) {\r\n    if (f.call(/** @type {?} */ (opt_this), obj[key], key, obj)) {\r\n      return key;\r\n    }\r\n  }\r\n  return undefined;\r\n};\r\n\r\n\r\n/**\r\n * Searches an object for an element that satisfies the given condition and\r\n * returns its value.\r\n * @param {Object<K,V>} obj The object to search in.\r\n * @param {function(this:T,V,string,Object<K,V>):boolean} f The function\r\n *     to call for every element. Takes 3 arguments (the value, the key\r\n *     and the object) and should return a boolean.\r\n * @param {T=} opt_this An optional \"this\" context for the function.\r\n * @return {V} The value of an element for which the function returns true or\r\n *     undefined if no such element is found.\r\n * @template T,K,V\r\n */\r\ngoog.object.findValue = function(obj, f, opt_this) {\r\n  var key = goog.object.findKey(obj, f, opt_this);\r\n  return key && obj[key];\r\n};\r\n\r\n\r\n/**\r\n * Whether the object/map/hash is empty.\r\n *\r\n * @param {Object} obj The object to test.\r\n * @return {boolean} true if obj is empty.\r\n */\r\ngoog.object.isEmpty = function(obj) {\r\n  for (var key in obj) {\r\n    return false;\r\n  }\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * Removes all key value pairs from the object/map/hash.\r\n *\r\n * @param {Object} obj The object to clear.\r\n */\r\ngoog.object.clear = function(obj) {\r\n  for (var i in obj) {\r\n    delete obj[i];\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Removes a key-value pair based on the key.\r\n *\r\n * @param {Object} obj The object from which to remove the key.\r\n * @param {?} key The key to remove.\r\n * @return {boolean} Whether an element was removed.\r\n */\r\ngoog.object.remove = function(obj, key) {\r\n  var rv;\r\n  if (rv = key in /** @type {!Object} */ (obj)) {\r\n    delete obj[key];\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Adds a key-value pair to the object. Throws an exception if the key is\r\n * already in use. Use set if you want to change an existing pair.\r\n *\r\n * @param {Object<K,V>} obj The object to which to add the key-value pair.\r\n * @param {string} key The key to add.\r\n * @param {V} val The value to add.\r\n * @template K,V\r\n */\r\ngoog.object.add = function(obj, key, val) {\r\n  if (obj !== null && key in obj) {\r\n    throw new Error('The object already contains the key \"' + key + '\"');\r\n  }\r\n  goog.object.set(obj, key, val);\r\n};\r\n\r\n\r\n/**\r\n * Returns the value for the given key.\r\n *\r\n * @param {Object<K,V>} obj The object from which to get the value.\r\n * @param {string} key The key for which to get the value.\r\n * @param {R=} opt_val The value to return if no item is found for the given\r\n *     key (default is undefined).\r\n * @return {V|R|undefined} The value for the given key.\r\n * @template K,V,R\r\n */\r\ngoog.object.get = function(obj, key, opt_val) {\r\n  if (obj !== null && key in obj) {\r\n    return obj[key];\r\n  }\r\n  return opt_val;\r\n};\r\n\r\n\r\n/**\r\n * Adds a key-value pair to the object/map/hash.\r\n *\r\n * @param {Object<K,V>} obj The object to which to add the key-value pair.\r\n * @param {string} key The key to add.\r\n * @param {V} value The value to add.\r\n * @template K,V\r\n */\r\ngoog.object.set = function(obj, key, value) {\r\n  obj[key] = value;\r\n};\r\n\r\n\r\n/**\r\n * Adds a key-value pair to the object/map/hash if it doesn't exist yet.\r\n *\r\n * @param {Object<K,V>} obj The object to which to add the key-value pair.\r\n * @param {string} key The key to add.\r\n * @param {V} value The value to add if the key wasn't present.\r\n * @return {V} The value of the entry at the end of the function.\r\n * @template K,V\r\n */\r\ngoog.object.setIfUndefined = function(obj, key, value) {\r\n  return key in /** @type {!Object} */ (obj) ? obj[key] : (obj[key] = value);\r\n};\r\n\r\n\r\n/**\r\n * Sets a key and value to an object if the key is not set. The value will be\r\n * the return value of the given function. If the key already exists, the\r\n * object will not be changed and the function will not be called (the function\r\n * will be lazily evaluated -- only called if necessary).\r\n *\r\n * This function is particularly useful when used with an `Object` which is\r\n * acting as a cache.\r\n *\r\n * @param {!Object<K,V>} obj The object to which to add the key-value pair.\r\n * @param {string} key The key to add.\r\n * @param {function():V} f The value to add if the key wasn't present.\r\n * @return {V} The value of the entry at the end of the function.\r\n * @template K,V\r\n */\r\ngoog.object.setWithReturnValueIfNotSet = function(obj, key, f) {\r\n  if (key in obj) {\r\n    return obj[key];\r\n  }\r\n\r\n  var val = f();\r\n  obj[key] = val;\r\n  return val;\r\n};\r\n\r\n\r\n/**\r\n * Compares two objects for equality using === on the values.\r\n *\r\n * @param {!Object<K,V>} a\r\n * @param {!Object<K,V>} b\r\n * @return {boolean}\r\n * @template K,V\r\n */\r\ngoog.object.equals = function(a, b) {\r\n  for (var k in a) {\r\n    if (!(k in b) || a[k] !== b[k]) {\r\n      return false;\r\n    }\r\n  }\r\n  for (var k in b) {\r\n    if (!(k in a)) {\r\n      return false;\r\n    }\r\n  }\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * Returns a shallow clone of the object.\r\n *\r\n * @param {Object<K,V>} obj Object to clone.\r\n * @return {!Object<K,V>} Clone of the input object.\r\n * @template K,V\r\n */\r\ngoog.object.clone = function(obj) {\r\n  // We cannot use the prototype trick because a lot of methods depend on where\r\n  // the actual key is set.\r\n\r\n  var res = {};\r\n  for (var key in obj) {\r\n    res[key] = obj[key];\r\n  }\r\n  return res;\r\n  // We could also use goog.mixin but I wanted this to be independent from that.\r\n};\r\n\r\n\r\n/**\r\n * Clones a value. The input may be an Object, Array, or basic type. Objects and\r\n * arrays will be cloned recursively.\r\n *\r\n * WARNINGS:\r\n * <code>goog.object.unsafeClone</code> does not detect reference loops. Objects\r\n * that refer to themselves will cause infinite recursion.\r\n *\r\n * <code>goog.object.unsafeClone</code> is unaware of unique identifiers, and\r\n * copies UIDs created by <code>getUid</code> into cloned results.\r\n *\r\n * @param {T} obj The value to clone.\r\n * @return {T} A clone of the input value.\r\n * @template T\r\n */\r\ngoog.object.unsafeClone = function(obj) {\r\n  var type = goog.typeOf(obj);\r\n  if (type == 'object' || type == 'array') {\r\n    if (goog.isFunction(obj.clone)) {\r\n      return obj.clone();\r\n    }\r\n    var clone = type == 'array' ? [] : {};\r\n    for (var key in obj) {\r\n      clone[key] = goog.object.unsafeClone(obj[key]);\r\n    }\r\n    return clone;\r\n  }\r\n\r\n  return obj;\r\n};\r\n\r\n\r\n/**\r\n * Returns a new object in which all the keys and values are interchanged\r\n * (keys become values and values become keys). If multiple keys map to the\r\n * same value, the chosen transposed value is implementation-dependent.\r\n *\r\n * @param {Object} obj The object to transpose.\r\n * @return {!Object} The transposed object.\r\n */\r\ngoog.object.transpose = function(obj) {\r\n  var transposed = {};\r\n  for (var key in obj) {\r\n    transposed[obj[key]] = key;\r\n  }\r\n  return transposed;\r\n};\r\n\r\n\r\n/**\r\n * The names of the fields that are defined on Object.prototype.\r\n * @type {Array<string>}\r\n * @private\r\n */\r\ngoog.object.PROTOTYPE_FIELDS_ = [\r\n  'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',\r\n  'toLocaleString', 'toString', 'valueOf'\r\n];\r\n\r\n\r\n/**\r\n * Extends an object with another object.\r\n * This operates 'in-place'; it does not create a new Object.\r\n *\r\n * Example:\r\n * var o = {};\r\n * goog.object.extend(o, {a: 0, b: 1});\r\n * o; // {a: 0, b: 1}\r\n * goog.object.extend(o, {b: 2, c: 3});\r\n * o; // {a: 0, b: 2, c: 3}\r\n *\r\n * @param {Object} target The object to modify. Existing properties will be\r\n *     overwritten if they are also present in one of the objects in\r\n *     `var_args`.\r\n * @param {...(Object|null|undefined)} var_args The objects from which values\r\n *     will be copied.\r\n */\r\ngoog.object.extend = function(target, var_args) {\r\n  var key, source;\r\n  for (var i = 1; i < arguments.length; i++) {\r\n    source = arguments[i];\r\n    for (key in source) {\r\n      target[key] = source[key];\r\n    }\r\n\r\n    // For IE the for-in-loop does not contain any properties that are not\r\n    // enumerable on the prototype object (for example isPrototypeOf from\r\n    // Object.prototype) and it will also not include 'replace' on objects that\r\n    // extend String and change 'replace' (not that it is common for anyone to\r\n    // extend anything except Object).\r\n\r\n    for (var j = 0; j < goog.object.PROTOTYPE_FIELDS_.length; j++) {\r\n      key = goog.object.PROTOTYPE_FIELDS_[j];\r\n      if (Object.prototype.hasOwnProperty.call(source, key)) {\r\n        target[key] = source[key];\r\n      }\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Creates a new object built from the key-value pairs provided as arguments.\r\n * @param {...*} var_args If only one argument is provided and it is an array\r\n *     then this is used as the arguments, otherwise even arguments are used as\r\n *     the property names and odd arguments are used as the property values.\r\n * @return {!Object} The new object.\r\n * @throws {Error} If there are uneven number of arguments or there is only one\r\n *     non array argument.\r\n */\r\ngoog.object.create = function(var_args) {\r\n  var argLength = arguments.length;\r\n  if (argLength == 1 && goog.isArray(arguments[0])) {\r\n    return goog.object.create.apply(null, arguments[0]);\r\n  }\r\n\r\n  if (argLength % 2) {\r\n    throw new Error('Uneven number of arguments');\r\n  }\r\n\r\n  var rv = {};\r\n  for (var i = 0; i < argLength; i += 2) {\r\n    rv[arguments[i]] = arguments[i + 1];\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Creates a new object where the property names come from the arguments but\r\n * the value is always set to true\r\n * @param {...*} var_args If only one argument is provided and it is an array\r\n *     then this is used as the arguments, otherwise the arguments are used\r\n *     as the property names.\r\n * @return {!Object} The new object.\r\n */\r\ngoog.object.createSet = function(var_args) {\r\n  var argLength = arguments.length;\r\n  if (argLength == 1 && goog.isArray(arguments[0])) {\r\n    return goog.object.createSet.apply(null, arguments[0]);\r\n  }\r\n\r\n  var rv = {};\r\n  for (var i = 0; i < argLength; i++) {\r\n    rv[arguments[i]] = true;\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Creates an immutable view of the underlying object, if the browser\r\n * supports immutable objects.\r\n *\r\n * In default mode, writes to this view will fail silently. In strict mode,\r\n * they will throw an error.\r\n *\r\n * @param {!Object<K,V>} obj An object.\r\n * @return {!Object<K,V>} An immutable view of that object, or the\r\n *     original object if this browser does not support immutables.\r\n * @template K,V\r\n */\r\ngoog.object.createImmutableView = function(obj) {\r\n  var result = obj;\r\n  if (Object.isFrozen && !Object.isFrozen(obj)) {\r\n    result = Object.create(obj);\r\n    Object.freeze(result);\r\n  }\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * @param {!Object} obj An object.\r\n * @return {boolean} Whether this is an immutable view of the object.\r\n */\r\ngoog.object.isImmutableView = function(obj) {\r\n  return !!Object.isFrozen && Object.isFrozen(obj);\r\n};\r\n\r\n\r\n/**\r\n * Get all properties names on a given Object regardless of enumerability.\r\n *\r\n * <p> If the browser does not support `Object.getOwnPropertyNames` nor\r\n * `Object.getPrototypeOf` then this is equivalent to using\r\n * `goog.object.getKeys`\r\n *\r\n * @param {?Object} obj The object to get the properties of.\r\n * @param {boolean=} opt_includeObjectPrototype Whether properties defined on\r\n *     `Object.prototype` should be included in the result.\r\n * @param {boolean=} opt_includeFunctionPrototype Whether properties defined on\r\n *     `Function.prototype` should be included in the result.\r\n * @return {!Array<string>}\r\n * @public\r\n */\r\ngoog.object.getAllPropertyNames = function(\r\n    obj, opt_includeObjectPrototype, opt_includeFunctionPrototype) {\r\n  if (!obj) {\r\n    return [];\r\n  }\r\n\r\n  // Naively use a for..in loop to get the property names if the browser doesn't\r\n  // support any other APIs for getting it.\r\n  if (!Object.getOwnPropertyNames || !Object.getPrototypeOf) {\r\n    return goog.object.getKeys(obj);\r\n  }\r\n\r\n  var visitedSet = {};\r\n\r\n  // Traverse the prototype chain and add all properties to the visited set.\r\n  var proto = obj;\r\n  while (proto &&\r\n         (proto !== Object.prototype || !!opt_includeObjectPrototype) &&\r\n         (proto !== Function.prototype || !!opt_includeFunctionPrototype)) {\r\n    var names = Object.getOwnPropertyNames(proto);\r\n    for (var i = 0; i < names.length; i++) {\r\n      visitedSet[names[i]] = true;\r\n    }\r\n    proto = Object.getPrototypeOf(proto);\r\n  }\r\n\r\n  return goog.object.getKeys(visitedSet);\r\n};\r\n","// Copyright 2009 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Useful compiler idioms.\r\n *\r\n * @author johnlenz@google.com (John Lenz)\r\n */\r\n\r\ngoog.provide('goog.reflect');\r\n\r\n\r\n/**\r\n * Syntax for object literal casts.\r\n * @see http://go/jscompiler-renaming\r\n * @see https://goo.gl/CRs09P\r\n *\r\n * Use this if you have an object literal whose keys need to have the same names\r\n * as the properties of some class even after they are renamed by the compiler.\r\n *\r\n * @param {!Function} type Type to cast to.\r\n * @param {Object} object Object literal to cast.\r\n * @return {Object} The object literal.\r\n */\r\ngoog.reflect.object = function(type, object) {\r\n  return object;\r\n};\r\n\r\n/**\r\n * Syntax for renaming property strings.\r\n * @see http://go/jscompiler-renaming\r\n * @see https://goo.gl/CRs09P\r\n *\r\n * Use this if you have an need to access a property as a string, but want\r\n * to also have the property renamed by the compiler. In contrast to\r\n * goog.reflect.object, this method takes an instance of an object.\r\n *\r\n * Properties must be simple names (not qualified names).\r\n *\r\n * @param {string} prop Name of the property\r\n * @param {!Object} object Instance of the object whose type will be used\r\n *     for renaming\r\n * @return {string} The renamed property.\r\n */\r\ngoog.reflect.objectProperty = function(prop, object) {\r\n  return prop;\r\n};\r\n\r\n/**\r\n * To assert to the compiler that an operation is needed when it would\r\n * otherwise be stripped. For example:\r\n * <code>\r\n *     // Force a layout\r\n *     goog.reflect.sinkValue(dialog.offsetHeight);\r\n * </code>\r\n * @param {T} x\r\n * @return {T}\r\n * @template T\r\n */\r\ngoog.reflect.sinkValue = function(x) {\r\n  goog.reflect.sinkValue[' '](x);\r\n  return x;\r\n};\r\n\r\n\r\n/**\r\n * The compiler should optimize this function away iff no one ever uses\r\n * goog.reflect.sinkValue.\r\n */\r\ngoog.reflect.sinkValue[' '] = goog.nullFunction;\r\n\r\n\r\n/**\r\n * Check if a property can be accessed without throwing an exception.\r\n * @param {Object} obj The owner of the property.\r\n * @param {string} prop The property name.\r\n * @return {boolean} Whether the property is accessible. Will also return true\r\n *     if obj is null.\r\n */\r\ngoog.reflect.canAccessProperty = function(obj, prop) {\r\n\r\n  try {\r\n    goog.reflect.sinkValue(obj[prop]);\r\n    return true;\r\n  } catch (e) {\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Retrieves a value from a cache given a key. The compiler provides special\r\n * consideration for this call such that it is generally considered side-effect\r\n * free. However, if the `opt_keyFn` or `valueFn` have side-effects\r\n * then the entire call is considered to have side-effects.\r\n *\r\n * Conventionally storing the value on the cache would be considered a\r\n * side-effect and preclude unused calls from being pruned, ie. even if\r\n * the value was never used, it would still always be stored in the cache.\r\n *\r\n * Providing a side-effect free `valueFn` and `opt_keyFn`\r\n * allows unused calls to `goog.reflect.cache` to be pruned.\r\n *\r\n * @param {!Object<K, V>} cacheObj The object that contains the cached values.\r\n * @param {?} key The key to lookup in the cache. If it is not string or number\r\n *     then a `opt_keyFn` should be provided. The key is also used as the\r\n *     parameter to the `valueFn`.\r\n * @param {function(?):V} valueFn The value provider to use to calculate the\r\n *     value to store in the cache. This function should be side-effect free\r\n *     to take advantage of the optimization.\r\n * @param {function(?):K=} opt_keyFn The key provider to determine the cache\r\n *     map key. This should be used if the given key is not a string or number.\r\n *     If not provided then the given key is used. This function should be\r\n *     side-effect free to take advantage of the optimization.\r\n * @return {V} The cached or calculated value.\r\n * @template K\r\n * @template V\r\n */\r\ngoog.reflect.cache = function(cacheObj, key, valueFn, opt_keyFn) {\r\n  var storedKey = opt_keyFn ? opt_keyFn(key) : key;\r\n\r\n  if (Object.prototype.hasOwnProperty.call(cacheObj, storedKey)) {\r\n    return cacheObj[storedKey];\r\n  }\r\n\r\n  return (cacheObj[storedKey] = valueFn(key));\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Rendering engine detection.\r\n * @see <a href=\"http://www.useragentstring.com/\">User agent strings</a>\r\n * For information on the browser brand (such as Safari versus Chrome), see\r\n * goog.userAgent.product.\r\n * @author arv@google.com (Erik Arvidsson)\r\n * @see ../demos/useragent.html\r\n */\r\n\r\ngoog.provide('goog.userAgent');\r\n\r\ngoog.require('goog.labs.userAgent.browser');\r\ngoog.require('goog.labs.userAgent.engine');\r\ngoog.require('goog.labs.userAgent.platform');\r\ngoog.require('goog.labs.userAgent.util');\r\ngoog.require('goog.reflect');\r\ngoog.require('goog.string');\r\n\r\n\r\n/**\r\n * @define {boolean} Whether we know at compile-time that the browser is IE.\r\n */\r\ngoog.userAgent.ASSUME_IE = goog.define('goog.userAgent.ASSUME_IE', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether we know at compile-time that the browser is EDGE.\r\n */\r\ngoog.userAgent.ASSUME_EDGE = goog.define('goog.userAgent.ASSUME_EDGE', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether we know at compile-time that the browser is GECKO.\r\n */\r\ngoog.userAgent.ASSUME_GECKO = goog.define('goog.userAgent.ASSUME_GECKO', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether we know at compile-time that the browser is WEBKIT.\r\n */\r\ngoog.userAgent.ASSUME_WEBKIT =\r\n    goog.define('goog.userAgent.ASSUME_WEBKIT', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether we know at compile-time that the browser is a\r\n *     mobile device running WebKit e.g. iPhone or Android.\r\n */\r\ngoog.userAgent.ASSUME_MOBILE_WEBKIT =\r\n    goog.define('goog.userAgent.ASSUME_MOBILE_WEBKIT', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether we know at compile-time that the browser is OPERA.\r\n */\r\ngoog.userAgent.ASSUME_OPERA = goog.define('goog.userAgent.ASSUME_OPERA', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the\r\n *     `goog.userAgent.isVersionOrHigher`\r\n *     function will return true for any version.\r\n */\r\ngoog.userAgent.ASSUME_ANY_VERSION =\r\n    goog.define('goog.userAgent.ASSUME_ANY_VERSION', false);\r\n\r\n\r\n/**\r\n * Whether we know the browser engine at compile-time.\r\n * @type {boolean}\r\n * @private\r\n */\r\ngoog.userAgent.BROWSER_KNOWN_ = goog.userAgent.ASSUME_IE ||\r\n    goog.userAgent.ASSUME_EDGE || goog.userAgent.ASSUME_GECKO ||\r\n    goog.userAgent.ASSUME_MOBILE_WEBKIT || goog.userAgent.ASSUME_WEBKIT ||\r\n    goog.userAgent.ASSUME_OPERA;\r\n\r\n\r\n/**\r\n * Returns the userAgent string for the current browser.\r\n *\r\n * @return {string} The userAgent string.\r\n */\r\ngoog.userAgent.getUserAgentString = function() {\r\n  return goog.labs.userAgent.util.getUserAgent();\r\n};\r\n\r\n\r\n/**\r\n * @return {?Navigator} The native navigator object.\r\n */\r\ngoog.userAgent.getNavigatorTyped = function() {\r\n  // Need a local navigator reference instead of using the global one,\r\n  // to avoid the rare case where they reference different objects.\r\n  // (in a WorkerPool, for example).\r\n  return goog.global['navigator'] || null;\r\n};\r\n\r\n\r\n/**\r\n * TODO(nnaze): Change type to \"Navigator\" and update compilation targets.\r\n * @return {?Object} The native navigator object.\r\n */\r\ngoog.userAgent.getNavigator = function() {\r\n  return goog.userAgent.getNavigatorTyped();\r\n};\r\n\r\n\r\n/**\r\n * Whether the user agent is Opera.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.OPERA = goog.userAgent.BROWSER_KNOWN_ ?\r\n    goog.userAgent.ASSUME_OPERA :\r\n    goog.labs.userAgent.browser.isOpera();\r\n\r\n\r\n/**\r\n * Whether the user agent is Internet Explorer.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.IE = goog.userAgent.BROWSER_KNOWN_ ?\r\n    goog.userAgent.ASSUME_IE :\r\n    goog.labs.userAgent.browser.isIE();\r\n\r\n\r\n/**\r\n * Whether the user agent is Microsoft Edge.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.EDGE = goog.userAgent.BROWSER_KNOWN_ ?\r\n    goog.userAgent.ASSUME_EDGE :\r\n    goog.labs.userAgent.engine.isEdge();\r\n\r\n\r\n/**\r\n * Whether the user agent is MS Internet Explorer or MS Edge.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.EDGE_OR_IE = goog.userAgent.EDGE || goog.userAgent.IE;\r\n\r\n\r\n/**\r\n * Whether the user agent is Gecko. Gecko is the rendering engine used by\r\n * Mozilla, Firefox, and others.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.GECKO = goog.userAgent.BROWSER_KNOWN_ ?\r\n    goog.userAgent.ASSUME_GECKO :\r\n    goog.labs.userAgent.engine.isGecko();\r\n\r\n\r\n/**\r\n * Whether the user agent is WebKit. WebKit is the rendering engine that\r\n * Safari, Android and others use.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.WEBKIT = goog.userAgent.BROWSER_KNOWN_ ?\r\n    goog.userAgent.ASSUME_WEBKIT || goog.userAgent.ASSUME_MOBILE_WEBKIT :\r\n    goog.labs.userAgent.engine.isWebKit();\r\n\r\n\r\n/**\r\n * Whether the user agent is running on a mobile device.\r\n *\r\n * This is a separate function so that the logic can be tested.\r\n *\r\n * TODO(nnaze): Investigate swapping in goog.labs.userAgent.device.isMobile().\r\n *\r\n * @return {boolean} Whether the user agent is running on a mobile device.\r\n * @private\r\n */\r\ngoog.userAgent.isMobile_ = function() {\r\n  return goog.userAgent.WEBKIT &&\r\n      goog.labs.userAgent.util.matchUserAgent('Mobile');\r\n};\r\n\r\n\r\n/**\r\n * Whether the user agent is running on a mobile device.\r\n *\r\n * TODO(nnaze): Consider deprecating MOBILE when labs.userAgent\r\n *   is promoted as the gecko/webkit logic is likely inaccurate.\r\n *\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.MOBILE =\r\n    goog.userAgent.ASSUME_MOBILE_WEBKIT || goog.userAgent.isMobile_();\r\n\r\n\r\n/**\r\n * Used while transitioning code to use WEBKIT instead.\r\n * @type {boolean}\r\n * @deprecated Use {@link goog.userAgent.product.SAFARI} instead.\r\n * TODO(nicksantos): Delete this from goog.userAgent.\r\n */\r\ngoog.userAgent.SAFARI = goog.userAgent.WEBKIT;\r\n\r\n\r\n/**\r\n * @return {string} the platform (operating system) the user agent is running\r\n *     on. Default to empty string because navigator.platform may not be defined\r\n *     (on Rhino, for example).\r\n * @private\r\n */\r\ngoog.userAgent.determinePlatform_ = function() {\r\n  var navigator = goog.userAgent.getNavigatorTyped();\r\n  return navigator && navigator.platform || '';\r\n};\r\n\r\n\r\n/**\r\n * The platform (operating system) the user agent is running on. Default to\r\n * empty string because navigator.platform may not be defined (on Rhino, for\r\n * example).\r\n * @type {string}\r\n */\r\ngoog.userAgent.PLATFORM = goog.userAgent.determinePlatform_();\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the user agent is running on a Macintosh operating\r\n *     system.\r\n */\r\ngoog.userAgent.ASSUME_MAC = goog.define('goog.userAgent.ASSUME_MAC', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the user agent is running on a Windows operating\r\n *     system.\r\n */\r\ngoog.userAgent.ASSUME_WINDOWS =\r\n    goog.define('goog.userAgent.ASSUME_WINDOWS', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the user agent is running on a Linux operating\r\n *     system.\r\n */\r\ngoog.userAgent.ASSUME_LINUX = goog.define('goog.userAgent.ASSUME_LINUX', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the user agent is running on a X11 windowing\r\n *     system.\r\n */\r\ngoog.userAgent.ASSUME_X11 = goog.define('goog.userAgent.ASSUME_X11', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the user agent is running on Android.\r\n */\r\ngoog.userAgent.ASSUME_ANDROID =\r\n    goog.define('goog.userAgent.ASSUME_ANDROID', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the user agent is running on an iPhone.\r\n */\r\ngoog.userAgent.ASSUME_IPHONE =\r\n    goog.define('goog.userAgent.ASSUME_IPHONE', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the user agent is running on an iPad.\r\n */\r\ngoog.userAgent.ASSUME_IPAD = goog.define('goog.userAgent.ASSUME_IPAD', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the user agent is running on an iPod.\r\n */\r\ngoog.userAgent.ASSUME_IPOD = goog.define('goog.userAgent.ASSUME_IPOD', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the user agent is running on KaiOS.\r\n */\r\ngoog.userAgent.ASSUME_KAIOS = goog.define('goog.userAgent.ASSUME_KAIOS', false);\r\n\r\n/**\r\n * @define {boolean} Whether the user agent is running on Go2Phone.\r\n */\r\ngoog.userAgent.ASSUME_GO2PHONE =\r\n    goog.define('goog.userAgent.ASSUME_GO2PHONE', false);\r\n\r\n\r\n/**\r\n * @type {boolean}\r\n * @private\r\n */\r\ngoog.userAgent.PLATFORM_KNOWN_ = goog.userAgent.ASSUME_MAC ||\r\n    goog.userAgent.ASSUME_WINDOWS || goog.userAgent.ASSUME_LINUX ||\r\n    goog.userAgent.ASSUME_X11 || goog.userAgent.ASSUME_ANDROID ||\r\n    goog.userAgent.ASSUME_IPHONE || goog.userAgent.ASSUME_IPAD ||\r\n    goog.userAgent.ASSUME_IPOD;\r\n\r\n\r\n/**\r\n * Whether the user agent is running on a Macintosh operating system.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.MAC = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    goog.userAgent.ASSUME_MAC :\r\n    goog.labs.userAgent.platform.isMacintosh();\r\n\r\n\r\n/**\r\n * Whether the user agent is running on a Windows operating system.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.WINDOWS = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    goog.userAgent.ASSUME_WINDOWS :\r\n    goog.labs.userAgent.platform.isWindows();\r\n\r\n\r\n/**\r\n * Whether the user agent is Linux per the legacy behavior of\r\n * goog.userAgent.LINUX, which considered ChromeOS to also be\r\n * Linux.\r\n * @return {boolean}\r\n * @private\r\n */\r\ngoog.userAgent.isLegacyLinux_ = function() {\r\n  return goog.labs.userAgent.platform.isLinux() ||\r\n      goog.labs.userAgent.platform.isChromeOS();\r\n};\r\n\r\n\r\n/**\r\n * Whether the user agent is running on a Linux operating system.\r\n *\r\n * Note that goog.userAgent.LINUX considers ChromeOS to be Linux,\r\n * while goog.labs.userAgent.platform considers ChromeOS and\r\n * Linux to be different OSes.\r\n *\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.LINUX = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    goog.userAgent.ASSUME_LINUX :\r\n    goog.userAgent.isLegacyLinux_();\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user agent is an X11 windowing system.\r\n * @private\r\n */\r\ngoog.userAgent.isX11_ = function() {\r\n  var navigator = goog.userAgent.getNavigatorTyped();\r\n  return !!navigator &&\r\n      goog.string.contains(navigator['appVersion'] || '', 'X11');\r\n};\r\n\r\n\r\n/**\r\n * Whether the user agent is running on a X11 windowing system.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.X11 = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    goog.userAgent.ASSUME_X11 :\r\n    goog.userAgent.isX11_();\r\n\r\n\r\n/**\r\n * Whether the user agent is running on Android.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.ANDROID = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    goog.userAgent.ASSUME_ANDROID :\r\n    goog.labs.userAgent.platform.isAndroid();\r\n\r\n\r\n/**\r\n * Whether the user agent is running on an iPhone.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.IPHONE = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    goog.userAgent.ASSUME_IPHONE :\r\n    goog.labs.userAgent.platform.isIphone();\r\n\r\n\r\n/**\r\n * Whether the user agent is running on an iPad.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.IPAD = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    goog.userAgent.ASSUME_IPAD :\r\n    goog.labs.userAgent.platform.isIpad();\r\n\r\n\r\n/**\r\n * Whether the user agent is running on an iPod.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.IPOD = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    goog.userAgent.ASSUME_IPOD :\r\n    goog.labs.userAgent.platform.isIpod();\r\n\r\n\r\n/**\r\n * Whether the user agent is running on iOS.\r\n * @type {boolean}\r\n */\r\ngoog.userAgent.IOS = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    (goog.userAgent.ASSUME_IPHONE || goog.userAgent.ASSUME_IPAD ||\r\n     goog.userAgent.ASSUME_IPOD) :\r\n    goog.labs.userAgent.platform.isIos();\r\n\r\n/**\r\n * Whether the user agent is running on KaiOS.\r\n */\r\ngoog.userAgent.KAIOS = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    goog.userAgent.ASSUME_KAIOS :\r\n    goog.labs.userAgent.platform.isKaiOS();\r\n\r\n/**\r\n * Whether the user agent is running on Go2Phone.\r\n */\r\ngoog.userAgent.GO2PHONE = goog.userAgent.PLATFORM_KNOWN_ ?\r\n    goog.userAgent.ASSUME_GO2PHONE :\r\n    goog.labs.userAgent.platform.isGo2Phone();\r\n\r\n\r\n/**\r\n * @return {string} The string that describes the version number of the user\r\n *     agent.\r\n * @private\r\n */\r\ngoog.userAgent.determineVersion_ = function() {\r\n  // All browsers have different ways to detect the version and they all have\r\n  // different naming schemes.\r\n  // version is a string rather than a number because it may contain 'b', 'a',\r\n  // and so on.\r\n  var version = '';\r\n  var arr = goog.userAgent.getVersionRegexResult_();\r\n  if (arr) {\r\n    version = arr ? arr[1] : '';\r\n  }\r\n\r\n  if (goog.userAgent.IE) {\r\n    // IE9 can be in document mode 9 but be reporting an inconsistent user agent\r\n    // version.  If it is identifying as a version lower than 9 we take the\r\n    // documentMode as the version instead.  IE8 has similar behavior.\r\n    // It is recommended to set the X-UA-Compatible header to ensure that IE9\r\n    // uses documentMode 9.\r\n    var docMode = goog.userAgent.getDocumentMode_();\r\n    if (docMode != null && docMode > parseFloat(version)) {\r\n      return String(docMode);\r\n    }\r\n  }\r\n\r\n  return version;\r\n};\r\n\r\n\r\n/**\r\n * @return {?IArrayLike<string>|undefined} The version regex matches from\r\n *     parsing the user\r\n *     agent string. These regex statements must be executed inline so they can\r\n *     be compiled out by the closure compiler with the rest of the useragent\r\n *     detection logic when ASSUME_* is specified.\r\n * @private\r\n */\r\ngoog.userAgent.getVersionRegexResult_ = function() {\r\n  var userAgent = goog.userAgent.getUserAgentString();\r\n  if (goog.userAgent.GECKO) {\r\n    return /rv\\:([^\\);]+)(\\)|;)/.exec(userAgent);\r\n  }\r\n  if (goog.userAgent.EDGE) {\r\n    return /Edge\\/([\\d\\.]+)/.exec(userAgent);\r\n  }\r\n  if (goog.userAgent.IE) {\r\n    return /\\b(?:MSIE|rv)[: ]([^\\);]+)(\\)|;)/.exec(userAgent);\r\n  }\r\n  if (goog.userAgent.WEBKIT) {\r\n    // WebKit/125.4\r\n    return /WebKit\\/(\\S+)/.exec(userAgent);\r\n  }\r\n  if (goog.userAgent.OPERA) {\r\n    // If none of the above browsers were detected but the browser is Opera, the\r\n    // only string that is of interest is 'Version/<number>'.\r\n    return /(?:Version)[ \\/]?(\\S+)/.exec(userAgent);\r\n  }\r\n  return undefined;\r\n};\r\n\r\n\r\n/**\r\n * @return {number|undefined} Returns the document mode (for testing).\r\n * @private\r\n */\r\ngoog.userAgent.getDocumentMode_ = function() {\r\n  // NOTE(user): goog.userAgent may be used in context where there is no DOM.\r\n  var doc = goog.global['document'];\r\n  return doc ? doc['documentMode'] : undefined;\r\n};\r\n\r\n\r\n/**\r\n * The version of the user agent. This is a string because it might contain\r\n * 'b' (as in beta) as well as multiple dots.\r\n * @type {string}\r\n */\r\ngoog.userAgent.VERSION = goog.userAgent.determineVersion_();\r\n\r\n\r\n/**\r\n * Compares two version numbers.\r\n *\r\n * @param {string} v1 Version of first item.\r\n * @param {string} v2 Version of second item.\r\n *\r\n * @return {number}  1 if first argument is higher\r\n *                   0 if arguments are equal\r\n *                  -1 if second argument is higher.\r\n * @deprecated Use goog.string.compareVersions.\r\n */\r\ngoog.userAgent.compare = function(v1, v2) {\r\n  return goog.string.compareVersions(v1, v2);\r\n};\r\n\r\n\r\n/**\r\n * Cache for {@link goog.userAgent.isVersionOrHigher}.\r\n * Calls to compareVersions are surprisingly expensive and, as a browser's\r\n * version number is unlikely to change during a session, we cache the results.\r\n * @const\r\n * @private\r\n */\r\ngoog.userAgent.isVersionOrHigherCache_ = {};\r\n\r\n\r\n/**\r\n * Whether the user agent version is higher or the same as the given version.\r\n * NOTE: When checking the version numbers for Firefox and Safari, be sure to\r\n * use the engine's version, not the browser's version number.  For example,\r\n * Firefox 3.0 corresponds to Gecko 1.9 and Safari 3.0 to Webkit 522.11.\r\n * Opera and Internet Explorer versions match the product release number.<br>\r\n * @see <a href=\"http://en.wikipedia.org/wiki/Safari_version_history\">\r\n *     Webkit</a>\r\n * @see <a href=\"http://en.wikipedia.org/wiki/Gecko_engine\">Gecko</a>\r\n *\r\n * @param {string|number} version The version to check.\r\n * @return {boolean} Whether the user agent version is higher or the same as\r\n *     the given version.\r\n */\r\ngoog.userAgent.isVersionOrHigher = function(version) {\r\n  return goog.userAgent.ASSUME_ANY_VERSION ||\r\n      goog.reflect.cache(\r\n          goog.userAgent.isVersionOrHigherCache_, version, function() {\r\n            return goog.string.compareVersions(\r\n                       goog.userAgent.VERSION, version) >= 0;\r\n          });\r\n};\r\n\r\n\r\n/**\r\n * Deprecated alias to `goog.userAgent.isVersionOrHigher`.\r\n * @param {string|number} version The version to check.\r\n * @return {boolean} Whether the user agent version is higher or the same as\r\n *     the given version.\r\n * @deprecated Use goog.userAgent.isVersionOrHigher().\r\n */\r\ngoog.userAgent.isVersion = goog.userAgent.isVersionOrHigher;\r\n\r\n\r\n/**\r\n * Whether the IE effective document mode is higher or the same as the given\r\n * document mode version.\r\n * NOTE: Only for IE, return false for another browser.\r\n *\r\n * @param {number} documentMode The document mode version to check.\r\n * @return {boolean} Whether the IE effective document mode is higher or the\r\n *     same as the given version.\r\n */\r\ngoog.userAgent.isDocumentModeOrHigher = function(documentMode) {\r\n  return Number(goog.userAgent.DOCUMENT_MODE) >= documentMode;\r\n};\r\n\r\n\r\n/**\r\n * Deprecated alias to `goog.userAgent.isDocumentModeOrHigher`.\r\n * @param {number} version The version to check.\r\n * @return {boolean} Whether the IE effective document mode is higher or the\r\n *      same as the given version.\r\n * @deprecated Use goog.userAgent.isDocumentModeOrHigher().\r\n */\r\ngoog.userAgent.isDocumentMode = goog.userAgent.isDocumentModeOrHigher;\r\n\r\n\r\n/**\r\n * For IE version < 7, documentMode is undefined, so attempt to use the\r\n * CSS1Compat property to see if we are in standards mode. If we are in\r\n * standards mode, treat the browser version as the document mode. Otherwise,\r\n * IE is emulating version 5.\r\n * @type {number|undefined}\r\n * @const\r\n */\r\ngoog.userAgent.DOCUMENT_MODE = (function() {\r\n  var doc = goog.global['document'];\r\n  var mode = goog.userAgent.getDocumentMode_();\r\n  if (!doc || !goog.userAgent.IE) {\r\n    return undefined;\r\n  }\r\n  return mode || (doc['compatMode'] == 'CSS1Compat' ?\r\n                      parseInt(goog.userAgent.VERSION, 10) :\r\n                      5);\r\n})();\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Closure user agent detection (Browser).\r\n * @see <a href=\"http://www.useragentstring.com/\">User agent strings</a>\r\n * For more information on rendering engine, platform, or device see the other\r\n * sub-namespaces in goog.labs.userAgent, goog.labs.userAgent.platform,\r\n * goog.labs.userAgent.device respectively.)\r\n *\r\n * @author martone@google.com (Andy Martone)\r\n */\r\n\r\ngoog.provide('goog.labs.userAgent.browser');\r\n\r\ngoog.require('goog.array');\r\ngoog.require('goog.labs.userAgent.util');\r\ngoog.require('goog.object');\r\ngoog.require('goog.string.internal');\r\n\r\n\r\n// TODO(nnaze): Refactor to remove excessive exclusion logic in matching\r\n// functions.\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Opera.  Note: Chromium\r\n *     based Opera (Opera 15+) is detected as Chrome to avoid unnecessary\r\n *     special casing.\r\n * @private\r\n */\r\ngoog.labs.userAgent.browser.matchOpera_ = function() {\r\n  return goog.labs.userAgent.util.matchUserAgent('Opera');\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is IE.\r\n * @private\r\n */\r\ngoog.labs.userAgent.browser.matchIE_ = function() {\r\n  return goog.labs.userAgent.util.matchUserAgent('Trident') ||\r\n      goog.labs.userAgent.util.matchUserAgent('MSIE');\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Edge.\r\n * @private\r\n */\r\ngoog.labs.userAgent.browser.matchEdge_ = function() {\r\n  return goog.labs.userAgent.util.matchUserAgent('Edge');\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Firefox.\r\n * @private\r\n */\r\ngoog.labs.userAgent.browser.matchFirefox_ = function() {\r\n  return goog.labs.userAgent.util.matchUserAgent('Firefox') ||\r\n      goog.labs.userAgent.util.matchUserAgent('FxiOS');\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Safari.\r\n * @private\r\n */\r\ngoog.labs.userAgent.browser.matchSafari_ = function() {\r\n  return goog.labs.userAgent.util.matchUserAgent('Safari') &&\r\n      !(goog.labs.userAgent.browser.matchChrome_() ||\r\n        goog.labs.userAgent.browser.matchCoast_() ||\r\n        goog.labs.userAgent.browser.matchOpera_() ||\r\n        goog.labs.userAgent.browser.matchEdge_() ||\r\n        goog.labs.userAgent.browser.matchFirefox_() ||\r\n        goog.labs.userAgent.browser.isSilk() ||\r\n        goog.labs.userAgent.util.matchUserAgent('Android'));\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Coast (Opera's Webkit-based\r\n *     iOS browser).\r\n * @private\r\n */\r\ngoog.labs.userAgent.browser.matchCoast_ = function() {\r\n  return goog.labs.userAgent.util.matchUserAgent('Coast');\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is iOS Webview.\r\n * @private\r\n */\r\ngoog.labs.userAgent.browser.matchIosWebview_ = function() {\r\n  // iOS Webview does not show up as Chrome or Safari. Also check for Opera's\r\n  // WebKit-based iOS browser, Coast.\r\n  return (goog.labs.userAgent.util.matchUserAgent('iPad') ||\r\n          goog.labs.userAgent.util.matchUserAgent('iPhone')) &&\r\n      !goog.labs.userAgent.browser.matchSafari_() &&\r\n      !goog.labs.userAgent.browser.matchChrome_() &&\r\n      !goog.labs.userAgent.browser.matchCoast_() &&\r\n      !goog.labs.userAgent.browser.matchFirefox_() &&\r\n      goog.labs.userAgent.util.matchUserAgent('AppleWebKit');\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Chrome.\r\n * @private\r\n */\r\ngoog.labs.userAgent.browser.matchChrome_ = function() {\r\n  return (goog.labs.userAgent.util.matchUserAgent('Chrome') ||\r\n          goog.labs.userAgent.util.matchUserAgent('CriOS')) &&\r\n      !goog.labs.userAgent.browser.matchEdge_();\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is the Android browser.\r\n * @private\r\n */\r\ngoog.labs.userAgent.browser.matchAndroidBrowser_ = function() {\r\n  // Android can appear in the user agent string for Chrome on Android.\r\n  // This is not the Android standalone browser if it does.\r\n  return goog.labs.userAgent.util.matchUserAgent('Android') &&\r\n      !(goog.labs.userAgent.browser.isChrome() ||\r\n        goog.labs.userAgent.browser.isFirefox() ||\r\n        goog.labs.userAgent.browser.isOpera() ||\r\n        goog.labs.userAgent.browser.isSilk());\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Opera.\r\n */\r\ngoog.labs.userAgent.browser.isOpera = goog.labs.userAgent.browser.matchOpera_;\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is IE.\r\n */\r\ngoog.labs.userAgent.browser.isIE = goog.labs.userAgent.browser.matchIE_;\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Edge.\r\n */\r\ngoog.labs.userAgent.browser.isEdge = goog.labs.userAgent.browser.matchEdge_;\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Firefox.\r\n */\r\ngoog.labs.userAgent.browser.isFirefox =\r\n    goog.labs.userAgent.browser.matchFirefox_;\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Safari.\r\n */\r\ngoog.labs.userAgent.browser.isSafari = goog.labs.userAgent.browser.matchSafari_;\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Coast (Opera's Webkit-based\r\n *     iOS browser).\r\n */\r\ngoog.labs.userAgent.browser.isCoast = goog.labs.userAgent.browser.matchCoast_;\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is iOS Webview.\r\n */\r\ngoog.labs.userAgent.browser.isIosWebview =\r\n    goog.labs.userAgent.browser.matchIosWebview_;\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is Chrome.\r\n */\r\ngoog.labs.userAgent.browser.isChrome = goog.labs.userAgent.browser.matchChrome_;\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user's browser is the Android browser.\r\n */\r\ngoog.labs.userAgent.browser.isAndroidBrowser =\r\n    goog.labs.userAgent.browser.matchAndroidBrowser_;\r\n\r\n\r\n/**\r\n * For more information, see:\r\n * http://docs.aws.amazon.com/silk/latest/developerguide/user-agent.html\r\n * @return {boolean} Whether the user's browser is Silk.\r\n */\r\ngoog.labs.userAgent.browser.isSilk = function() {\r\n  return goog.labs.userAgent.util.matchUserAgent('Silk');\r\n};\r\n\r\n\r\n/**\r\n * @return {string} The browser version or empty string if version cannot be\r\n *     determined. Note that for Internet Explorer, this returns the version of\r\n *     the browser, not the version of the rendering engine. (IE 8 in\r\n *     compatibility mode will return 8.0 rather than 7.0. To determine the\r\n *     rendering engine version, look at document.documentMode instead. See\r\n *     http://msdn.microsoft.com/en-us/library/cc196988(v=vs.85).aspx for more\r\n *     details.)\r\n */\r\ngoog.labs.userAgent.browser.getVersion = function() {\r\n  var userAgentString = goog.labs.userAgent.util.getUserAgent();\r\n  // Special case IE since IE's version is inside the parenthesis and\r\n  // without the '/'.\r\n  if (goog.labs.userAgent.browser.isIE()) {\r\n    return goog.labs.userAgent.browser.getIEVersion_(userAgentString);\r\n  }\r\n\r\n  var versionTuples =\r\n      goog.labs.userAgent.util.extractVersionTuples(userAgentString);\r\n\r\n  // Construct a map for easy lookup.\r\n  var versionMap = {};\r\n  goog.array.forEach(versionTuples, function(tuple) {\r\n    // Note that the tuple is of length three, but we only care about the\r\n    // first two.\r\n    var key = tuple[0];\r\n    var value = tuple[1];\r\n    versionMap[key] = value;\r\n  });\r\n\r\n  var versionMapHasKey = goog.partial(goog.object.containsKey, versionMap);\r\n\r\n  // Gives the value with the first key it finds, otherwise empty string.\r\n  function lookUpValueWithKeys(keys) {\r\n    var key = goog.array.find(keys, versionMapHasKey);\r\n    return versionMap[key] || '';\r\n  }\r\n\r\n  // Check Opera before Chrome since Opera 15+ has \"Chrome\" in the string.\r\n  // See\r\n  // http://my.opera.com/ODIN/blog/2013/07/15/opera-user-agent-strings-opera-15-and-beyond\r\n  if (goog.labs.userAgent.browser.isOpera()) {\r\n    // Opera 10 has Version/10.0 but Opera/9.8, so look for \"Version\" first.\r\n    // Opera uses 'OPR' for more recent UAs.\r\n    return lookUpValueWithKeys(['Version', 'Opera']);\r\n  }\r\n\r\n  // Check Edge before Chrome since it has Chrome in the string.\r\n  if (goog.labs.userAgent.browser.isEdge()) {\r\n    return lookUpValueWithKeys(['Edge']);\r\n  }\r\n\r\n  if (goog.labs.userAgent.browser.isChrome()) {\r\n    return lookUpValueWithKeys(['Chrome', 'CriOS']);\r\n  }\r\n\r\n  // Usually products browser versions are in the third tuple after \"Mozilla\"\r\n  // and the engine.\r\n  var tuple = versionTuples[2];\r\n  return tuple && tuple[1] || '';\r\n};\r\n\r\n\r\n/**\r\n * @param {string|number} version The version to check.\r\n * @return {boolean} Whether the browser version is higher or the same as the\r\n *     given version.\r\n */\r\ngoog.labs.userAgent.browser.isVersionOrHigher = function(version) {\r\n  return goog.string.internal.compareVersions(\r\n             goog.labs.userAgent.browser.getVersion(), version) >= 0;\r\n};\r\n\r\n\r\n/**\r\n * Determines IE version. More information:\r\n * http://msdn.microsoft.com/en-us/library/ie/bg182625(v=vs.85).aspx#uaString\r\n * http://msdn.microsoft.com/en-us/library/hh869301(v=vs.85).aspx\r\n * http://blogs.msdn.com/b/ie/archive/2010/03/23/introducing-ie9-s-user-agent-string.aspx\r\n * http://blogs.msdn.com/b/ie/archive/2009/01/09/the-internet-explorer-8-user-agent-string-updated-edition.aspx\r\n *\r\n * @param {string} userAgent the User-Agent.\r\n * @return {string}\r\n * @private\r\n */\r\ngoog.labs.userAgent.browser.getIEVersion_ = function(userAgent) {\r\n  // IE11 may identify itself as MSIE 9.0 or MSIE 10.0 due to an IE 11 upgrade\r\n  // bug. Example UA:\r\n  // Mozilla/5.0 (MSIE 9.0; Windows NT 6.1; WOW64; Trident/7.0; rv:11.0)\r\n  // like Gecko.\r\n  // See http://www.whatismybrowser.com/developers/unknown-user-agent-fragments.\r\n  var rv = /rv: *([\\d\\.]*)/.exec(userAgent);\r\n  if (rv && rv[1]) {\r\n    return rv[1];\r\n  }\r\n\r\n  var version = '';\r\n  var msie = /MSIE +([\\d\\.]+)/.exec(userAgent);\r\n  if (msie && msie[1]) {\r\n    // IE in compatibility mode usually identifies itself as MSIE 7.0; in this\r\n    // case, use the Trident version to determine the version of IE. For more\r\n    // details, see the links above.\r\n    var tridentVersion = /Trident\\/(\\d.\\d)/.exec(userAgent);\r\n    if (msie[1] == '7.0') {\r\n      if (tridentVersion && tridentVersion[1]) {\r\n        switch (tridentVersion[1]) {\r\n          case '4.0':\r\n            version = '8.0';\r\n            break;\r\n          case '5.0':\r\n            version = '9.0';\r\n            break;\r\n          case '6.0':\r\n            version = '10.0';\r\n            break;\r\n          case '7.0':\r\n            version = '11.0';\r\n            break;\r\n        }\r\n      } else {\r\n        version = '7.0';\r\n      }\r\n    } else {\r\n      version = msie[1];\r\n    }\r\n  }\r\n  return version;\r\n};\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Closure user agent detection.\r\n * @see http://en.wikipedia.org/wiki/User_agent\r\n * For more information on browser brand, platform, or device see the other\r\n * sub-namespaces in goog.labs.userAgent (browser, platform, and device).\r\n *\r\n */\r\n\r\ngoog.provide('goog.labs.userAgent.engine');\r\n\r\ngoog.require('goog.array');\r\ngoog.require('goog.labs.userAgent.util');\r\ngoog.require('goog.string');\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the rendering engine is Presto.\r\n */\r\ngoog.labs.userAgent.engine.isPresto = function() {\r\n  return goog.labs.userAgent.util.matchUserAgent('Presto');\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the rendering engine is Trident.\r\n */\r\ngoog.labs.userAgent.engine.isTrident = function() {\r\n  // IE only started including the Trident token in IE8.\r\n  return goog.labs.userAgent.util.matchUserAgent('Trident') ||\r\n      goog.labs.userAgent.util.matchUserAgent('MSIE');\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the rendering engine is Edge.\r\n */\r\ngoog.labs.userAgent.engine.isEdge = function() {\r\n  return goog.labs.userAgent.util.matchUserAgent('Edge');\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the rendering engine is WebKit.\r\n */\r\ngoog.labs.userAgent.engine.isWebKit = function() {\r\n  return goog.labs.userAgent.util.matchUserAgentIgnoreCase('WebKit') &&\r\n      !goog.labs.userAgent.engine.isEdge();\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the rendering engine is Gecko.\r\n */\r\ngoog.labs.userAgent.engine.isGecko = function() {\r\n  return goog.labs.userAgent.util.matchUserAgent('Gecko') &&\r\n      !goog.labs.userAgent.engine.isWebKit() &&\r\n      !goog.labs.userAgent.engine.isTrident() &&\r\n      !goog.labs.userAgent.engine.isEdge();\r\n};\r\n\r\n\r\n/**\r\n * @return {string} The rendering engine's version or empty string if version\r\n *     can't be determined.\r\n */\r\ngoog.labs.userAgent.engine.getVersion = function() {\r\n  var userAgentString = goog.labs.userAgent.util.getUserAgent();\r\n  if (userAgentString) {\r\n    var tuples = goog.labs.userAgent.util.extractVersionTuples(userAgentString);\r\n\r\n    var engineTuple = goog.labs.userAgent.engine.getEngineTuple_(tuples);\r\n    if (engineTuple) {\r\n      // In Gecko, the version string is either in the browser info or the\r\n      // Firefox version.  See Gecko user agent string reference:\r\n      // http://goo.gl/mULqa\r\n      if (engineTuple[0] == 'Gecko') {\r\n        return goog.labs.userAgent.engine.getVersionForKey_(tuples, 'Firefox');\r\n      }\r\n\r\n      return engineTuple[1];\r\n    }\r\n\r\n    // MSIE has only one version identifier, and the Trident version is\r\n    // specified in the parenthetical. IE Edge is covered in the engine tuple\r\n    // detection.\r\n    var browserTuple = tuples[0];\r\n    var info;\r\n    if (browserTuple && (info = browserTuple[2])) {\r\n      var match = /Trident\\/([^\\s;]+)/.exec(info);\r\n      if (match) {\r\n        return match[1];\r\n      }\r\n    }\r\n  }\r\n  return '';\r\n};\r\n\r\n\r\n/**\r\n * @param {!Array<!Array<string>>} tuples Extracted version tuples.\r\n * @return {!Array<string>|undefined} The engine tuple or undefined if not\r\n *     found.\r\n * @private\r\n */\r\ngoog.labs.userAgent.engine.getEngineTuple_ = function(tuples) {\r\n  if (!goog.labs.userAgent.engine.isEdge()) {\r\n    return tuples[1];\r\n  }\r\n  for (var i = 0; i < tuples.length; i++) {\r\n    var tuple = tuples[i];\r\n    if (tuple[0] == 'Edge') {\r\n      return tuple;\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @param {string|number} version The version to check.\r\n * @return {boolean} Whether the rendering engine version is higher or the same\r\n *     as the given version.\r\n */\r\ngoog.labs.userAgent.engine.isVersionOrHigher = function(version) {\r\n  return goog.string.compareVersions(\r\n             goog.labs.userAgent.engine.getVersion(), version) >= 0;\r\n};\r\n\r\n\r\n/**\r\n * @param {!Array<!Array<string>>} tuples Version tuples.\r\n * @param {string} key The key to look for.\r\n * @return {string} The version string of the given key, if present.\r\n *     Otherwise, the empty string.\r\n * @private\r\n */\r\ngoog.labs.userAgent.engine.getVersionForKey_ = function(tuples, key) {\r\n  // TODO(nnaze): Move to util if useful elsewhere.\r\n\r\n  var pair = goog.array.find(tuples, function(pair) { return key == pair[0]; });\r\n\r\n  return pair && pair[1] || '';\r\n};\r\n","// Copyright 2010 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Browser capability checks for the events package.\r\n *\r\n */\r\n\r\n\r\ngoog.provide('goog.events.BrowserFeature');\r\n\r\ngoog.require('goog.userAgent');\r\ngoog.scope(function() {\r\n\r\n\r\n\r\n/**\r\n * Enum of browser capabilities.\r\n * @enum {boolean}\r\n */\r\ngoog.events.BrowserFeature = {\r\n  /**\r\n   * Whether the button attribute of the event is W3C compliant.  False in\r\n   * Internet Explorer prior to version 9; document-version dependent.\r\n   */\r\n  HAS_W3C_BUTTON:\r\n      !goog.userAgent.IE || goog.userAgent.isDocumentModeOrHigher(9),\r\n\r\n  /**\r\n   * Whether the browser supports full W3C event model.\r\n   */\r\n  HAS_W3C_EVENT_SUPPORT:\r\n      !goog.userAgent.IE || goog.userAgent.isDocumentModeOrHigher(9),\r\n\r\n  /**\r\n   * To prevent default in IE7-8 for certain keydown events we need set the\r\n   * keyCode to -1.\r\n   */\r\n  SET_KEY_CODE_TO_PREVENT_DEFAULT:\r\n      goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('9'),\r\n\r\n  /**\r\n   * Whether the `navigator.onLine` property is supported.\r\n   */\r\n  HAS_NAVIGATOR_ONLINE_PROPERTY:\r\n      !goog.userAgent.WEBKIT || goog.userAgent.isVersionOrHigher('528'),\r\n\r\n  /**\r\n   * Whether HTML5 network online/offline events are supported.\r\n   */\r\n  HAS_HTML5_NETWORK_EVENT_SUPPORT:\r\n      goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9b') ||\r\n      goog.userAgent.IE && goog.userAgent.isVersionOrHigher('8') ||\r\n      goog.userAgent.OPERA && goog.userAgent.isVersionOrHigher('9.5') ||\r\n      goog.userAgent.WEBKIT && goog.userAgent.isVersionOrHigher('528'),\r\n\r\n  /**\r\n   * Whether HTML5 network events fire on document.body, or otherwise the\r\n   * window.\r\n   */\r\n  HTML5_NETWORK_EVENTS_FIRE_ON_BODY:\r\n      goog.userAgent.GECKO && !goog.userAgent.isVersionOrHigher('8') ||\r\n      goog.userAgent.IE && !goog.userAgent.isVersionOrHigher('9'),\r\n\r\n  /**\r\n   * Whether touch is enabled in the browser.\r\n   */\r\n  TOUCH_ENABLED:\r\n      ('ontouchstart' in goog.global ||\r\n       !!(goog.global['document'] && document.documentElement &&\r\n          'ontouchstart' in document.documentElement) ||\r\n       // IE10 uses non-standard touch events, so it has a different check.\r\n       !!(goog.global['navigator'] &&\r\n          (goog.global['navigator']['maxTouchPoints'] ||\r\n           goog.global['navigator']['msMaxTouchPoints']))),\r\n\r\n  /**\r\n   * Whether addEventListener supports W3C standard pointer events.\r\n   * http://www.w3.org/TR/pointerevents/\r\n   */\r\n  POINTER_EVENTS: ('PointerEvent' in goog.global),\r\n\r\n  /**\r\n   * Whether addEventListener supports MSPointer events (only used in IE10).\r\n   * http://msdn.microsoft.com/en-us/library/ie/hh772103(v=vs.85).aspx\r\n   * http://msdn.microsoft.com/library/hh673557(v=vs.85).aspx\r\n   */\r\n  MSPOINTER_EVENTS:\r\n      ('MSPointerEvent' in goog.global &&\r\n       !!(goog.global['navigator'] &&\r\n          goog.global['navigator']['msPointerEnabled'])),\r\n\r\n  /**\r\n   * Whether addEventListener supports {passive: true}.\r\n   * https://developers.google.com/web/updates/2016/06/passive-event-listeners\r\n   */\r\n  PASSIVE_EVENTS: purify(function() {\r\n    // If we're in a web worker or other custom environment, we can't tell.\r\n    if (!goog.global.addEventListener || !Object.defineProperty) {  // IE 8\r\n      return false;\r\n    }\r\n\r\n    var passive = false;\r\n    var options = Object.defineProperty({}, 'passive', {\r\n      get: function() {\r\n        passive = true;\r\n      }\r\n    });\r\n    try {\r\n      goog.global.addEventListener('test', goog.nullFunction, options);\r\n      goog.global.removeEventListener('test', goog.nullFunction, options);\r\n    } catch (e) {\r\n    }\r\n\r\n    return passive;\r\n  })\r\n};\r\n\r\n\r\n/**\r\n * Tricks Closure Compiler into believing that a function is pure.  The compiler\r\n * assumes that any `valueOf` function is pure, without analyzing its contents.\r\n *\r\n * @param {function(): T} fn\r\n * @return {T}\r\n * @template T\r\n */\r\nfunction purify(fn) {\r\n  return ({valueOf: fn}).valueOf();\r\n}\r\n});  // goog.scope\r\n","// Copyright 2005 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview A base class for event objects.\r\n *\r\n */\r\n\r\n\r\ngoog.provide('goog.events.Event');\r\ngoog.provide('goog.events.EventLike');\r\n\r\n/**\r\n * goog.events.Event no longer depends on goog.Disposable. Keep requiring\r\n * goog.Disposable here to not break projects which assume this dependency.\r\n * @suppress {extraRequire}\r\n */\r\ngoog.require('goog.Disposable');\r\ngoog.require('goog.events.EventId');\r\n\r\n\r\n/**\r\n * A typedef for event like objects that are dispatchable via the\r\n * goog.events.dispatchEvent function. strings are treated as the type for a\r\n * goog.events.Event. Objects are treated as an extension of a new\r\n * goog.events.Event with the type property of the object being used as the type\r\n * of the Event.\r\n * @typedef {string|Object|goog.events.Event|goog.events.EventId}\r\n */\r\ngoog.events.EventLike;\r\n\r\n\r\n\r\n/**\r\n * A base class for event objects, so that they can support preventDefault and\r\n * stopPropagation.\r\n *\r\n * @suppress {underscore} Several properties on this class are technically\r\n *     public, but referencing these properties outside this package is strongly\r\n *     discouraged.\r\n *\r\n * @param {string|!goog.events.EventId} type Event Type.\r\n * @param {Object=} opt_target Reference to the object that is the target of\r\n *     this event. It has to implement the `EventTarget` interface\r\n *     declared at {@link http://developer.mozilla.org/en/DOM/EventTarget}.\r\n * @constructor\r\n */\r\ngoog.events.Event = function(type, opt_target) {\r\n  /**\r\n   * Event type.\r\n   * @type {string}\r\n   */\r\n  this.type = type instanceof goog.events.EventId ? String(type) : type;\r\n\r\n  /**\r\n   * TODO(tbreisacher): The type should probably be\r\n   * EventTarget|goog.events.EventTarget.\r\n   *\r\n   * Target of the event.\r\n   * @type {Object|undefined}\r\n   */\r\n  this.target = opt_target;\r\n\r\n  /**\r\n   * Object that had the listener attached.\r\n   * @type {Object|undefined}\r\n   */\r\n  this.currentTarget = this.target;\r\n\r\n  /**\r\n   * Whether to cancel the event in internal capture/bubble processing for IE.\r\n   * @type {boolean}\r\n   * @public\r\n   */\r\n  this.propagationStopped_ = false;\r\n\r\n  /**\r\n   * Whether the default action has been prevented.\r\n   * This is a property to match the W3C specification at\r\n   * {@link http://www.w3.org/TR/DOM-Level-3-Events/\r\n   * #events-event-type-defaultPrevented}.\r\n   * Must be treated as read-only outside the class.\r\n   * @type {boolean}\r\n   */\r\n  this.defaultPrevented = false;\r\n\r\n  /**\r\n   * Return value for in internal capture/bubble processing for IE.\r\n   * @type {boolean}\r\n   * @public\r\n   */\r\n  this.returnValue_ = true;\r\n};\r\n\r\n\r\n/**\r\n * Stops event propagation.\r\n */\r\ngoog.events.Event.prototype.stopPropagation = function() {\r\n  this.propagationStopped_ = true;\r\n};\r\n\r\n\r\n/**\r\n * Prevents the default action, for example a link redirecting to a url.\r\n */\r\ngoog.events.Event.prototype.preventDefault = function() {\r\n  this.defaultPrevented = true;\r\n  this.returnValue_ = false;\r\n};\r\n\r\n\r\n/**\r\n * Stops the propagation of the event. It is equivalent to\r\n * `e.stopPropagation()`, but can be used as the callback argument of\r\n * {@link goog.events.listen} without declaring another function.\r\n * @param {!goog.events.Event} e An event.\r\n */\r\ngoog.events.Event.stopPropagation = function(e) {\r\n  e.stopPropagation();\r\n};\r\n\r\n\r\n/**\r\n * Prevents the default action. It is equivalent to\r\n * `e.preventDefault()`, but can be used as the callback argument of\r\n * {@link goog.events.listen} without declaring another function.\r\n * @param {!goog.events.Event} e An event.\r\n */\r\ngoog.events.Event.preventDefault = function(e) {\r\n  e.preventDefault();\r\n};\r\n","// Copyright 2005 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview A patched, standardized event object for browser events.\r\n *\r\n * <pre>\r\n * The patched event object contains the following members:\r\n * - type           {string}    Event type, e.g. 'click'\r\n * - target         {Object}    The element that actually triggered the event\r\n * - currentTarget  {Object}    The element the listener is attached to\r\n * - relatedTarget  {Object}    For mouseover and mouseout, the previous object\r\n * - offsetX        {number}    X-coordinate relative to target\r\n * - offsetY        {number}    Y-coordinate relative to target\r\n * - clientX        {number}    X-coordinate relative to viewport\r\n * - clientY        {number}    Y-coordinate relative to viewport\r\n * - screenX        {number}    X-coordinate relative to the edge of the screen\r\n * - screenY        {number}    Y-coordinate relative to the edge of the screen\r\n * - button         {number}    Mouse button. Use isButton() to test.\r\n * - keyCode        {number}    Key-code\r\n * - ctrlKey        {boolean}   Was ctrl key depressed\r\n * - altKey         {boolean}   Was alt key depressed\r\n * - shiftKey       {boolean}   Was shift key depressed\r\n * - metaKey        {boolean}   Was meta key depressed\r\n * - pointerId      {number}    Pointer ID\r\n * - pointerType    {string}    Pointer type, e.g. 'mouse', 'pen', or 'touch'\r\n * - defaultPrevented {boolean} Whether the default action has been prevented\r\n * - state          {Object}    History state object\r\n *\r\n * NOTE: The keyCode member contains the raw browser keyCode. For normalized\r\n * key and character code use {@link goog.events.KeyHandler}.\r\n * </pre>\r\n *\r\n * @author arv@google.com (Erik Arvidsson)\r\n */\r\n\r\ngoog.provide('goog.events.BrowserEvent');\r\ngoog.provide('goog.events.BrowserEvent.MouseButton');\r\ngoog.provide('goog.events.BrowserEvent.PointerType');\r\n\r\ngoog.require('goog.debug');\r\ngoog.require('goog.events.BrowserFeature');\r\ngoog.require('goog.events.Event');\r\ngoog.require('goog.events.EventType');\r\ngoog.require('goog.reflect');\r\ngoog.require('goog.userAgent');\r\n\r\n/**\r\n * @define {boolean} If true, use the layerX and layerY properties of a native\r\n * browser event over the offsetX and offsetY properties, which cause expensive\r\n * reflow. If layerX or layerY is not defined, offsetX and offsetY will be used\r\n * as usual.\r\n */\r\ngoog.events.USE_LAYER_XY_AS_OFFSET_XY =\r\n    goog.define('goog.events.USE_LAYER_XY_AS_OFFSET_XY', false);\r\n\r\n/**\r\n * Accepts a browser event object and creates a patched, cross browser event\r\n * object.\r\n * The content of this object will not be initialized if no event object is\r\n * provided. If this is the case, init() needs to be invoked separately.\r\n * @param {Event=} opt_e Browser event object.\r\n * @param {EventTarget=} opt_currentTarget Current target for event.\r\n * @constructor\r\n * @extends {goog.events.Event}\r\n */\r\ngoog.events.BrowserEvent = function(opt_e, opt_currentTarget) {\r\n  goog.events.BrowserEvent.base(this, 'constructor', opt_e ? opt_e.type : '');\r\n\r\n  /**\r\n   * Target that fired the event.\r\n   * @override\r\n   * @type {?Node}\r\n   */\r\n  this.target = null;\r\n\r\n  /**\r\n   * Node that had the listener attached.\r\n   * @override\r\n   * @type {?Node|undefined}\r\n   */\r\n  this.currentTarget = null;\r\n\r\n  /**\r\n   * For mouseover and mouseout events, the related object for the event.\r\n   * @type {?Node}\r\n   */\r\n  this.relatedTarget = null;\r\n\r\n  /**\r\n   * X-coordinate relative to target.\r\n   * @type {number}\r\n   */\r\n  this.offsetX = 0;\r\n\r\n  /**\r\n   * Y-coordinate relative to target.\r\n   * @type {number}\r\n   */\r\n  this.offsetY = 0;\r\n\r\n  /**\r\n   * X-coordinate relative to the window.\r\n   * @type {number}\r\n   */\r\n  this.clientX = 0;\r\n\r\n  /**\r\n   * Y-coordinate relative to the window.\r\n   * @type {number}\r\n   */\r\n  this.clientY = 0;\r\n\r\n  /**\r\n   * X-coordinate relative to the monitor.\r\n   * @type {number}\r\n   */\r\n  this.screenX = 0;\r\n\r\n  /**\r\n   * Y-coordinate relative to the monitor.\r\n   * @type {number}\r\n   */\r\n  this.screenY = 0;\r\n\r\n  /**\r\n   * Which mouse button was pressed.\r\n   * @type {number}\r\n   */\r\n  this.button = 0;\r\n\r\n  /**\r\n   * Key of key press.\r\n   * @type {string}\r\n   */\r\n  this.key = '';\r\n\r\n  /**\r\n   * Keycode of key press.\r\n   * @type {number}\r\n   */\r\n  this.keyCode = 0;\r\n\r\n  /**\r\n   * Keycode of key press.\r\n   * @type {number}\r\n   */\r\n  this.charCode = 0;\r\n\r\n  /**\r\n   * Whether control was pressed at time of event.\r\n   * @type {boolean}\r\n   */\r\n  this.ctrlKey = false;\r\n\r\n  /**\r\n   * Whether alt was pressed at time of event.\r\n   * @type {boolean}\r\n   */\r\n  this.altKey = false;\r\n\r\n  /**\r\n   * Whether shift was pressed at time of event.\r\n   * @type {boolean}\r\n   */\r\n  this.shiftKey = false;\r\n\r\n  /**\r\n   * Whether the meta key was pressed at time of event.\r\n   * @type {boolean}\r\n   */\r\n  this.metaKey = false;\r\n\r\n  /**\r\n   * History state object, only set for PopState events where it's a copy of the\r\n   * state object provided to pushState or replaceState.\r\n   * @type {?Object}\r\n   */\r\n  this.state = null;\r\n\r\n  /**\r\n   * Whether the default platform modifier key was pressed at time of event.\r\n   * (This is control for all platforms except Mac, where it's Meta.)\r\n   * @type {boolean}\r\n   */\r\n  this.platformModifierKey = false;\r\n\r\n  /**\r\n   * @type {number}\r\n   */\r\n  this.pointerId = 0;\r\n\r\n  /**\r\n   * @type {string}\r\n   */\r\n  this.pointerType = '';\r\n\r\n  /**\r\n   * The browser event object.\r\n   * @private {?Event}\r\n   */\r\n  this.event_ = null;\r\n\r\n  if (opt_e) {\r\n    this.init(opt_e, opt_currentTarget);\r\n  }\r\n};\r\ngoog.inherits(goog.events.BrowserEvent, goog.events.Event);\r\n\r\n\r\n/**\r\n * Normalized button constants for the mouse.\r\n * @enum {number}\r\n */\r\ngoog.events.BrowserEvent.MouseButton = {\r\n  LEFT: 0,\r\n  MIDDLE: 1,\r\n  RIGHT: 2\r\n};\r\n\r\n\r\n/**\r\n * Normalized pointer type constants for pointer events.\r\n * @enum {string}\r\n */\r\ngoog.events.BrowserEvent.PointerType = {\r\n  MOUSE: 'mouse',\r\n  PEN: 'pen',\r\n  TOUCH: 'touch'\r\n};\r\n\r\n\r\n/**\r\n * Static data for mapping mouse buttons.\r\n * @type {!Array<number>}\r\n * @deprecated Use `goog.events.BrowserEvent.IE_BUTTON_MAP` instead.\r\n */\r\ngoog.events.BrowserEvent.IEButtonMap = goog.debug.freeze([\r\n  1,  // LEFT\r\n  4,  // MIDDLE\r\n  2   // RIGHT\r\n]);\r\n\r\n\r\n/**\r\n * Static data for mapping mouse buttons.\r\n * @const {!Array<number>}\r\n */\r\ngoog.events.BrowserEvent.IE_BUTTON_MAP = goog.events.BrowserEvent.IEButtonMap;\r\n\r\n\r\n/**\r\n * Static data for mapping MSPointerEvent types to PointerEvent types.\r\n * @const {!Object<number, goog.events.BrowserEvent.PointerType>}\r\n */\r\ngoog.events.BrowserEvent.IE_POINTER_TYPE_MAP = goog.debug.freeze({\r\n  2: goog.events.BrowserEvent.PointerType.TOUCH,\r\n  3: goog.events.BrowserEvent.PointerType.PEN,\r\n  4: goog.events.BrowserEvent.PointerType.MOUSE\r\n});\r\n\r\n\r\n/**\r\n * Accepts a browser event object and creates a patched, cross browser event\r\n * object.\r\n * @param {Event} e Browser event object.\r\n * @param {EventTarget=} opt_currentTarget Current target for event.\r\n */\r\ngoog.events.BrowserEvent.prototype.init = function(e, opt_currentTarget) {\r\n  var type = this.type = e.type;\r\n\r\n  /**\r\n   * On touch devices use the first \"changed touch\" as the relevant touch.\r\n   * @type {?Touch}\r\n   */\r\n  var relevantTouch =\r\n      e.changedTouches && e.changedTouches.length ? e.changedTouches[0] : null;\r\n\r\n  // TODO(nicksantos): Change this.target to type EventTarget.\r\n  this.target = /** @type {Node} */ (e.target) || e.srcElement;\r\n\r\n  // TODO(nicksantos): Change this.currentTarget to type EventTarget.\r\n  this.currentTarget = /** @type {Node} */ (opt_currentTarget);\r\n\r\n  var relatedTarget = /** @type {Node} */ (e.relatedTarget);\r\n  if (relatedTarget) {\r\n    // There's a bug in FireFox where sometimes, relatedTarget will be a\r\n    // chrome element, and accessing any property of it will get a permission\r\n    // denied exception. See:\r\n    // https://bugzilla.mozilla.org/show_bug.cgi?id=497780\r\n    if (goog.userAgent.GECKO) {\r\n      if (!goog.reflect.canAccessProperty(relatedTarget, 'nodeName')) {\r\n        relatedTarget = null;\r\n      }\r\n    }\r\n  } else if (type == goog.events.EventType.MOUSEOVER) {\r\n    relatedTarget = e.fromElement;\r\n  } else if (type == goog.events.EventType.MOUSEOUT) {\r\n    relatedTarget = e.toElement;\r\n  }\r\n\r\n  this.relatedTarget = relatedTarget;\r\n\r\n  if (relevantTouch) {\r\n    this.clientX = relevantTouch.clientX !== undefined ? relevantTouch.clientX :\r\n                                                         relevantTouch.pageX;\r\n    this.clientY = relevantTouch.clientY !== undefined ? relevantTouch.clientY :\r\n                                                         relevantTouch.pageY;\r\n    this.screenX = relevantTouch.screenX || 0;\r\n    this.screenY = relevantTouch.screenY || 0;\r\n  } else {\r\n    if (goog.events.USE_LAYER_XY_AS_OFFSET_XY) {\r\n      this.offsetX = (e.layerX !== undefined) ? e.layerX : e.offsetX;\r\n      this.offsetY = (e.layerY !== undefined) ? e.layerY : e.offsetY;\r\n    } else {\r\n      // Webkit emits a lame warning whenever layerX/layerY is accessed.\r\n      // http://code.google.com/p/chromium/issues/detail?id=101733\r\n      this.offsetX = (goog.userAgent.WEBKIT || e.offsetX !== undefined) ?\r\n          e.offsetX :\r\n          e.layerX;\r\n      this.offsetY = (goog.userAgent.WEBKIT || e.offsetY !== undefined) ?\r\n          e.offsetY :\r\n          e.layerY;\r\n    }\r\n    this.clientX = e.clientX !== undefined ? e.clientX : e.pageX;\r\n    this.clientY = e.clientY !== undefined ? e.clientY : e.pageY;\r\n    this.screenX = e.screenX || 0;\r\n    this.screenY = e.screenY || 0;\r\n  }\r\n\r\n  this.button = e.button;\r\n\r\n  this.keyCode = e.keyCode || 0;\r\n  this.key = e.key || '';\r\n  this.charCode = e.charCode || (type == 'keypress' ? e.keyCode : 0);\r\n  this.ctrlKey = e.ctrlKey;\r\n  this.altKey = e.altKey;\r\n  this.shiftKey = e.shiftKey;\r\n  this.metaKey = e.metaKey;\r\n  this.platformModifierKey = goog.userAgent.MAC ? e.metaKey : e.ctrlKey;\r\n  this.pointerId = e.pointerId || 0;\r\n  this.pointerType = goog.events.BrowserEvent.getPointerType_(e);\r\n  this.state = e.state;\r\n  this.event_ = e;\r\n  if (e.defaultPrevented) {\r\n    this.preventDefault();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Tests to see which button was pressed during the event. This is really only\r\n * useful in IE and Gecko browsers. And in IE, it's only useful for\r\n * mousedown/mouseup events, because click only fires for the left mouse button.\r\n *\r\n * Safari 2 only reports the left button being clicked, and uses the value '1'\r\n * instead of 0. Opera only reports a mousedown event for the middle button, and\r\n * no mouse events for the right button. Opera has default behavior for left and\r\n * middle click that can only be overridden via a configuration setting.\r\n *\r\n * There's a nice table of this mess at http://www.unixpapa.com/js/mouse.html.\r\n *\r\n * @param {goog.events.BrowserEvent.MouseButton} button The button\r\n *     to test for.\r\n * @return {boolean} True if button was pressed.\r\n */\r\ngoog.events.BrowserEvent.prototype.isButton = function(button) {\r\n  if (!goog.events.BrowserFeature.HAS_W3C_BUTTON) {\r\n    if (this.type == 'click') {\r\n      return button == goog.events.BrowserEvent.MouseButton.LEFT;\r\n    } else {\r\n      return !!(\r\n          this.event_.button & goog.events.BrowserEvent.IE_BUTTON_MAP[button]);\r\n    }\r\n  } else {\r\n    return this.event_.button == button;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Whether this has an \"action\"-producing mouse button.\r\n *\r\n * By definition, this includes left-click on windows/linux, and left-click\r\n * without the ctrl key on Macs.\r\n *\r\n * @return {boolean} The result.\r\n */\r\ngoog.events.BrowserEvent.prototype.isMouseActionButton = function() {\r\n  // Webkit does not ctrl+click to be a right-click, so we\r\n  // normalize it to behave like Gecko and Opera.\r\n  return this.isButton(goog.events.BrowserEvent.MouseButton.LEFT) &&\r\n      !(goog.userAgent.WEBKIT && goog.userAgent.MAC && this.ctrlKey);\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\ngoog.events.BrowserEvent.prototype.stopPropagation = function() {\r\n  goog.events.BrowserEvent.superClass_.stopPropagation.call(this);\r\n  if (this.event_.stopPropagation) {\r\n    this.event_.stopPropagation();\r\n  } else {\r\n    this.event_.cancelBubble = true;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\ngoog.events.BrowserEvent.prototype.preventDefault = function() {\r\n  goog.events.BrowserEvent.superClass_.preventDefault.call(this);\r\n  var be = this.event_;\r\n  if (!be.preventDefault) {\r\n    be.returnValue = false;\r\n    if (goog.events.BrowserFeature.SET_KEY_CODE_TO_PREVENT_DEFAULT) {\r\n\r\n      try {\r\n        // Most keys can be prevented using returnValue. Some special keys\r\n        // require setting the keyCode to -1 as well:\r\n        //\r\n        // In IE7:\r\n        // F3, F5, F10, F11, Ctrl+P, Crtl+O, Ctrl+F (these are taken from IE6)\r\n        //\r\n        // In IE8:\r\n        // Ctrl+P, Crtl+O, Ctrl+F (F1-F12 cannot be stopped through the event)\r\n        //\r\n        // We therefore do this for all function keys as well as when Ctrl key\r\n        // is pressed.\r\n        var VK_F1 = 112;\r\n        var VK_F12 = 123;\r\n        if (be.ctrlKey || be.keyCode >= VK_F1 && be.keyCode <= VK_F12) {\r\n          be.keyCode = -1;\r\n        }\r\n      } catch (ex) {\r\n        // IE throws an 'access denied' exception when trying to change\r\n        // keyCode in some situations (e.g. srcElement is input[type=file],\r\n        // or srcElement is an anchor tag rewritten by parent's innerHTML).\r\n        // Do nothing in this case.\r\n      }\r\n    }\r\n  } else {\r\n    be.preventDefault();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {Event} The underlying browser event object.\r\n */\r\ngoog.events.BrowserEvent.prototype.getBrowserEvent = function() {\r\n  return this.event_;\r\n};\r\n\r\n\r\n/**\r\n * Extracts the pointer type from the given event.\r\n * @param {!Event} e\r\n * @return {string} The pointer type, e.g. 'mouse', 'pen', or 'touch'.\r\n * @private\r\n */\r\ngoog.events.BrowserEvent.getPointerType_ = function(e) {\r\n  if (goog.isString(e.pointerType)) {\r\n    return e.pointerType;\r\n  }\r\n  // IE10 uses integer codes for pointer type.\r\n  // https://msdn.microsoft.com/en-us/library/hh772359(v=vs.85).aspx\r\n  return goog.events.BrowserEvent.IE_POINTER_TYPE_MAP[e.pointerType] || '';\r\n};\r\n","// Copyright 2010 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Event Types.\r\n *\r\n * @author arv@google.com (Erik Arvidsson)\r\n */\r\n\r\n\r\ngoog.provide('goog.events.EventType');\r\ngoog.provide('goog.events.MouseAsMouseEventType');\r\ngoog.provide('goog.events.MouseEvents');\r\ngoog.provide('goog.events.PointerAsMouseEventType');\r\ngoog.provide('goog.events.PointerAsTouchEventType');\r\ngoog.provide('goog.events.PointerFallbackEventType');\r\ngoog.provide('goog.events.PointerTouchFallbackEventType');\r\n\r\ngoog.require('goog.events.BrowserFeature');\r\ngoog.require('goog.userAgent');\r\n\r\n\r\n/**\r\n * Returns a prefixed event name for the current browser.\r\n * @param {string} eventName The name of the event.\r\n * @return {string} The prefixed event name.\r\n * @suppress {missingRequire|missingProvide}\r\n * @private\r\n */\r\ngoog.events.getVendorPrefixedName_ = function(eventName) {\r\n  return goog.userAgent.WEBKIT ?\r\n      'webkit' + eventName :\r\n      (goog.userAgent.OPERA ? 'o' + eventName.toLowerCase() :\r\n                              eventName.toLowerCase());\r\n};\r\n\r\n\r\n/**\r\n * Constants for event names.\r\n * @enum {string}\r\n */\r\ngoog.events.EventType = {\r\n  // Mouse events\r\n  CLICK: 'click',\r\n  RIGHTCLICK: 'rightclick',\r\n  DBLCLICK: 'dblclick',\r\n  AUXCLICK: 'auxclick',\r\n  MOUSEDOWN: 'mousedown',\r\n  MOUSEUP: 'mouseup',\r\n  MOUSEOVER: 'mouseover',\r\n  MOUSEOUT: 'mouseout',\r\n  MOUSEMOVE: 'mousemove',\r\n  MOUSEENTER: 'mouseenter',\r\n  MOUSELEAVE: 'mouseleave',\r\n\r\n  // Non-existent event; will never fire. This exists as a mouse counterpart to\r\n  // POINTERCANCEL.\r\n  MOUSECANCEL: 'mousecancel',\r\n\r\n  // Selection events.\r\n  // https://www.w3.org/TR/selection-api/\r\n  SELECTIONCHANGE: 'selectionchange',\r\n  SELECTSTART: 'selectstart',  // IE, Safari, Chrome\r\n\r\n  // Wheel events\r\n  // http://www.w3.org/TR/DOM-Level-3-Events/#events-wheelevents\r\n  WHEEL: 'wheel',\r\n\r\n  // Key events\r\n  KEYPRESS: 'keypress',\r\n  KEYDOWN: 'keydown',\r\n  KEYUP: 'keyup',\r\n\r\n  // Focus\r\n  BLUR: 'blur',\r\n  FOCUS: 'focus',\r\n  DEACTIVATE: 'deactivate',  // IE only\r\n  FOCUSIN: 'focusin',\r\n  FOCUSOUT: 'focusout',\r\n\r\n  // Forms\r\n  CHANGE: 'change',\r\n  RESET: 'reset',\r\n  SELECT: 'select',\r\n  SUBMIT: 'submit',\r\n  INPUT: 'input',\r\n  PROPERTYCHANGE: 'propertychange',  // IE only\r\n\r\n  // Drag and drop\r\n  DRAGSTART: 'dragstart',\r\n  DRAG: 'drag',\r\n  DRAGENTER: 'dragenter',\r\n  DRAGOVER: 'dragover',\r\n  DRAGLEAVE: 'dragleave',\r\n  DROP: 'drop',\r\n  DRAGEND: 'dragend',\r\n\r\n  // Touch events\r\n  // Note that other touch events exist, but we should follow the W3C list here.\r\n  // http://www.w3.org/TR/touch-events/#list-of-touchevent-types\r\n  TOUCHSTART: 'touchstart',\r\n  TOUCHMOVE: 'touchmove',\r\n  TOUCHEND: 'touchend',\r\n  TOUCHCANCEL: 'touchcancel',\r\n\r\n  // Misc\r\n  BEFOREUNLOAD: 'beforeunload',\r\n  CONSOLEMESSAGE: 'consolemessage',\r\n  CONTEXTMENU: 'contextmenu',\r\n  DEVICECHANGE: 'devicechange',\r\n  DEVICEMOTION: 'devicemotion',\r\n  DEVICEORIENTATION: 'deviceorientation',\r\n  DOMCONTENTLOADED: 'DOMContentLoaded',\r\n  ERROR: 'error',\r\n  HELP: 'help',\r\n  LOAD: 'load',\r\n  LOSECAPTURE: 'losecapture',\r\n  ORIENTATIONCHANGE: 'orientationchange',\r\n  READYSTATECHANGE: 'readystatechange',\r\n  RESIZE: 'resize',\r\n  SCROLL: 'scroll',\r\n  UNLOAD: 'unload',\r\n\r\n  // Media events\r\n  CANPLAY: 'canplay',\r\n  CANPLAYTHROUGH: 'canplaythrough',\r\n  DURATIONCHANGE: 'durationchange',\r\n  EMPTIED: 'emptied',\r\n  ENDED: 'ended',\r\n  LOADEDDATA: 'loadeddata',\r\n  LOADEDMETADATA: 'loadedmetadata',\r\n  PAUSE: 'pause',\r\n  PLAY: 'play',\r\n  PLAYING: 'playing',\r\n  RATECHANGE: 'ratechange',\r\n  SEEKED: 'seeked',\r\n  SEEKING: 'seeking',\r\n  STALLED: 'stalled',\r\n  SUSPEND: 'suspend',\r\n  TIMEUPDATE: 'timeupdate',\r\n  VOLUMECHANGE: 'volumechange',\r\n  WAITING: 'waiting',\r\n\r\n  // Media Source Extensions events\r\n  // https://www.w3.org/TR/media-source/#mediasource-events\r\n  SOURCEOPEN: 'sourceopen',\r\n  SOURCEENDED: 'sourceended',\r\n  SOURCECLOSED: 'sourceclosed',\r\n  // https://www.w3.org/TR/media-source/#sourcebuffer-events\r\n  ABORT: 'abort',\r\n  UPDATE: 'update',\r\n  UPDATESTART: 'updatestart',\r\n  UPDATEEND: 'updateend',\r\n\r\n  // HTML 5 History events\r\n  // See http://www.w3.org/TR/html5/browsers.html#event-definitions-0\r\n  HASHCHANGE: 'hashchange',\r\n  PAGEHIDE: 'pagehide',\r\n  PAGESHOW: 'pageshow',\r\n  POPSTATE: 'popstate',\r\n\r\n  // Copy and Paste\r\n  // Support is limited. Make sure it works on your favorite browser\r\n  // before using.\r\n  // http://www.quirksmode.org/dom/events/cutcopypaste.html\r\n  COPY: 'copy',\r\n  PASTE: 'paste',\r\n  CUT: 'cut',\r\n  BEFORECOPY: 'beforecopy',\r\n  BEFORECUT: 'beforecut',\r\n  BEFOREPASTE: 'beforepaste',\r\n\r\n  // HTML5 online/offline events.\r\n  // http://www.w3.org/TR/offline-webapps/#related\r\n  ONLINE: 'online',\r\n  OFFLINE: 'offline',\r\n\r\n  // HTML 5 worker events\r\n  MESSAGE: 'message',\r\n  CONNECT: 'connect',\r\n\r\n  // Service Worker Events - ServiceWorkerGlobalScope context\r\n  // See https://w3c.github.io/ServiceWorker/#execution-context-events\r\n  // Note: message event defined in worker events section\r\n  INSTALL: 'install',\r\n  ACTIVATE: 'activate',\r\n  FETCH: 'fetch',\r\n  FOREIGNFETCH: 'foreignfetch',\r\n  MESSAGEERROR: 'messageerror',\r\n\r\n  // Service Worker Events - Document context\r\n  // See https://w3c.github.io/ServiceWorker/#document-context-events\r\n  STATECHANGE: 'statechange',\r\n  UPDATEFOUND: 'updatefound',\r\n  CONTROLLERCHANGE: 'controllerchange',\r\n\r\n  // CSS animation events.\r\n  /** @suppress {missingRequire} */\r\n  ANIMATIONSTART: goog.events.getVendorPrefixedName_('AnimationStart'),\r\n  /** @suppress {missingRequire} */\r\n  ANIMATIONEND: goog.events.getVendorPrefixedName_('AnimationEnd'),\r\n  /** @suppress {missingRequire} */\r\n  ANIMATIONITERATION: goog.events.getVendorPrefixedName_('AnimationIteration'),\r\n\r\n  // CSS transition events. Based on the browser support described at:\r\n  // https://developer.mozilla.org/en/css/css_transitions#Browser_compatibility\r\n  /** @suppress {missingRequire} */\r\n  TRANSITIONEND: goog.events.getVendorPrefixedName_('TransitionEnd'),\r\n\r\n  // W3C Pointer Events\r\n  // http://www.w3.org/TR/pointerevents/\r\n  POINTERDOWN: 'pointerdown',\r\n  POINTERUP: 'pointerup',\r\n  POINTERCANCEL: 'pointercancel',\r\n  POINTERMOVE: 'pointermove',\r\n  POINTEROVER: 'pointerover',\r\n  POINTEROUT: 'pointerout',\r\n  POINTERENTER: 'pointerenter',\r\n  POINTERLEAVE: 'pointerleave',\r\n  GOTPOINTERCAPTURE: 'gotpointercapture',\r\n  LOSTPOINTERCAPTURE: 'lostpointercapture',\r\n\r\n  // IE specific events.\r\n  // See http://msdn.microsoft.com/en-us/library/ie/hh772103(v=vs.85).aspx\r\n  // Note: these events will be supplanted in IE11.\r\n  MSGESTURECHANGE: 'MSGestureChange',\r\n  MSGESTUREEND: 'MSGestureEnd',\r\n  MSGESTUREHOLD: 'MSGestureHold',\r\n  MSGESTURESTART: 'MSGestureStart',\r\n  MSGESTURETAP: 'MSGestureTap',\r\n  MSGOTPOINTERCAPTURE: 'MSGotPointerCapture',\r\n  MSINERTIASTART: 'MSInertiaStart',\r\n  MSLOSTPOINTERCAPTURE: 'MSLostPointerCapture',\r\n  MSPOINTERCANCEL: 'MSPointerCancel',\r\n  MSPOINTERDOWN: 'MSPointerDown',\r\n  MSPOINTERENTER: 'MSPointerEnter',\r\n  MSPOINTERHOVER: 'MSPointerHover',\r\n  MSPOINTERLEAVE: 'MSPointerLeave',\r\n  MSPOINTERMOVE: 'MSPointerMove',\r\n  MSPOINTEROUT: 'MSPointerOut',\r\n  MSPOINTEROVER: 'MSPointerOver',\r\n  MSPOINTERUP: 'MSPointerUp',\r\n\r\n  // Native IMEs/input tools events.\r\n  TEXT: 'text',\r\n  // The textInput event is supported in IE9+, but only in lower case. All other\r\n  // browsers use the camel-case event name.\r\n  TEXTINPUT: goog.userAgent.IE ? 'textinput' : 'textInput',\r\n  COMPOSITIONSTART: 'compositionstart',\r\n  COMPOSITIONUPDATE: 'compositionupdate',\r\n  COMPOSITIONEND: 'compositionend',\r\n\r\n  // The beforeinput event is initially only supported in Safari. See\r\n  // https://bugs.chromium.org/p/chromium/issues/detail?id=342670 for Chrome\r\n  // implementation tracking.\r\n  BEFOREINPUT: 'beforeinput',\r\n\r\n  // Webview tag events\r\n  // See https://developer.chrome.com/apps/tags/webview\r\n  EXIT: 'exit',\r\n  LOADABORT: 'loadabort',\r\n  LOADCOMMIT: 'loadcommit',\r\n  LOADREDIRECT: 'loadredirect',\r\n  LOADSTART: 'loadstart',\r\n  LOADSTOP: 'loadstop',\r\n  RESPONSIVE: 'responsive',\r\n  SIZECHANGED: 'sizechanged',\r\n  UNRESPONSIVE: 'unresponsive',\r\n\r\n  // HTML5 Page Visibility API.  See details at\r\n  // `goog.labs.dom.PageVisibilityMonitor`.\r\n  VISIBILITYCHANGE: 'visibilitychange',\r\n\r\n  // LocalStorage event.\r\n  STORAGE: 'storage',\r\n\r\n  // DOM Level 2 mutation events (deprecated).\r\n  DOMSUBTREEMODIFIED: 'DOMSubtreeModified',\r\n  DOMNODEINSERTED: 'DOMNodeInserted',\r\n  DOMNODEREMOVED: 'DOMNodeRemoved',\r\n  DOMNODEREMOVEDFROMDOCUMENT: 'DOMNodeRemovedFromDocument',\r\n  DOMNODEINSERTEDINTODOCUMENT: 'DOMNodeInsertedIntoDocument',\r\n  DOMATTRMODIFIED: 'DOMAttrModified',\r\n  DOMCHARACTERDATAMODIFIED: 'DOMCharacterDataModified',\r\n\r\n  // Print events.\r\n  BEFOREPRINT: 'beforeprint',\r\n  AFTERPRINT: 'afterprint',\r\n\r\n  // Web app manifest events.\r\n  BEFOREINSTALLPROMPT: 'beforeinstallprompt',\r\n  APPINSTALLED: 'appinstalled'\r\n};\r\n\r\n\r\n/**\r\n * Returns one of the given pointer fallback event names in order of preference:\r\n *   1. pointerEventName\r\n *   2. msPointerEventName\r\n *   3. fallbackEventName\r\n * @param {string} pointerEventName\r\n * @param {string} msPointerEventName\r\n * @param {string} fallbackEventName\r\n * @return {string} The supported pointer or fallback (mouse or touch) event\r\n *     name.\r\n * @private\r\n */\r\ngoog.events.getPointerFallbackEventName_ = function(\r\n    pointerEventName, msPointerEventName, fallbackEventName) {\r\n  if (goog.events.BrowserFeature.POINTER_EVENTS) {\r\n    return pointerEventName;\r\n  }\r\n  if (goog.events.BrowserFeature.MSPOINTER_EVENTS) {\r\n    return msPointerEventName;\r\n  }\r\n  return fallbackEventName;\r\n};\r\n\r\n\r\n/**\r\n * Constants for pointer event names that fall back to corresponding mouse event\r\n * names on unsupported platforms. These are intended to be drop-in replacements\r\n * for corresponding values in `goog.events.EventType`.\r\n * @enum {string}\r\n */\r\ngoog.events.PointerFallbackEventType = {\r\n  POINTERDOWN: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTERDOWN, goog.events.EventType.MSPOINTERDOWN,\r\n      goog.events.EventType.MOUSEDOWN),\r\n  POINTERUP: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTERUP, goog.events.EventType.MSPOINTERUP,\r\n      goog.events.EventType.MOUSEUP),\r\n  POINTERCANCEL: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTERCANCEL,\r\n      goog.events.EventType.MSPOINTERCANCEL,\r\n      // When falling back to mouse events, there is no MOUSECANCEL equivalent\r\n      // of POINTERCANCEL. In this case POINTERUP already falls back to MOUSEUP\r\n      // which represents both UP and CANCEL. POINTERCANCEL does not fall back\r\n      // to MOUSEUP to prevent listening twice on the same event.\r\n      goog.events.EventType.MOUSECANCEL),\r\n  POINTERMOVE: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTERMOVE, goog.events.EventType.MSPOINTERMOVE,\r\n      goog.events.EventType.MOUSEMOVE),\r\n  POINTEROVER: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTEROVER, goog.events.EventType.MSPOINTEROVER,\r\n      goog.events.EventType.MOUSEOVER),\r\n  POINTEROUT: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTEROUT, goog.events.EventType.MSPOINTEROUT,\r\n      goog.events.EventType.MOUSEOUT),\r\n  POINTERENTER: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTERENTER, goog.events.EventType.MSPOINTERENTER,\r\n      goog.events.EventType.MOUSEENTER),\r\n  POINTERLEAVE: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTERLEAVE, goog.events.EventType.MSPOINTERLEAVE,\r\n      goog.events.EventType.MOUSELEAVE)\r\n};\r\n\r\n\r\n/**\r\n * Constants for pointer event names that fall back to corresponding touch event\r\n * names on unsupported platforms. These are intended to be drop-in replacements\r\n * for corresponding values in `goog.events.EventType`.\r\n * @enum {string}\r\n */\r\ngoog.events.PointerTouchFallbackEventType = {\r\n  POINTERDOWN: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTERDOWN, goog.events.EventType.MSPOINTERDOWN,\r\n      goog.events.EventType.TOUCHSTART),\r\n  POINTERUP: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTERUP, goog.events.EventType.MSPOINTERUP,\r\n      goog.events.EventType.TOUCHEND),\r\n  POINTERCANCEL: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTERCANCEL,\r\n      goog.events.EventType.MSPOINTERCANCEL, goog.events.EventType.TOUCHCANCEL),\r\n  POINTERMOVE: goog.events.getPointerFallbackEventName_(\r\n      goog.events.EventType.POINTERMOVE, goog.events.EventType.MSPOINTERMOVE,\r\n      goog.events.EventType.TOUCHMOVE)\r\n};\r\n\r\n\r\n/**\r\n * Mapping of mouse event names to underlying browser event names.\r\n * @typedef {{\r\n *     MOUSEDOWN: string,\r\n *     MOUSEUP: string,\r\n *     MOUSECANCEL:string,\r\n *     MOUSEMOVE:string,\r\n *     MOUSEOVER:string,\r\n *     MOUSEOUT:string,\r\n *     MOUSEENTER:string,\r\n *     MOUSELEAVE: string,\r\n * }}\r\n */\r\ngoog.events.MouseEvents;\r\n\r\n\r\n/**\r\n * An alias for `goog.events.EventType.MOUSE*` event types that is overridden by\r\n * corresponding `POINTER*` event types.\r\n * @const {!goog.events.MouseEvents}\r\n */\r\ngoog.events.PointerAsMouseEventType = {\r\n  MOUSEDOWN: goog.events.PointerFallbackEventType.POINTERDOWN,\r\n  MOUSEUP: goog.events.PointerFallbackEventType.POINTERUP,\r\n  MOUSECANCEL: goog.events.PointerFallbackEventType.POINTERCANCEL,\r\n  MOUSEMOVE: goog.events.PointerFallbackEventType.POINTERMOVE,\r\n  MOUSEOVER: goog.events.PointerFallbackEventType.POINTEROVER,\r\n  MOUSEOUT: goog.events.PointerFallbackEventType.POINTEROUT,\r\n  MOUSEENTER: goog.events.PointerFallbackEventType.POINTERENTER,\r\n  MOUSELEAVE: goog.events.PointerFallbackEventType.POINTERLEAVE\r\n};\r\n\r\n\r\n/**\r\n * An alias for `goog.events.EventType.MOUSE*` event types that continue to use\r\n * mouse events.\r\n * @const {!goog.events.MouseEvents}\r\n */\r\ngoog.events.MouseAsMouseEventType = {\r\n  MOUSEDOWN: goog.events.EventType.MOUSEDOWN,\r\n  MOUSEUP: goog.events.EventType.MOUSEUP,\r\n  MOUSECANCEL: goog.events.EventType.MOUSECANCEL,\r\n  MOUSEMOVE: goog.events.EventType.MOUSEMOVE,\r\n  MOUSEOVER: goog.events.EventType.MOUSEOVER,\r\n  MOUSEOUT: goog.events.EventType.MOUSEOUT,\r\n  MOUSEENTER: goog.events.EventType.MOUSEENTER,\r\n  MOUSELEAVE: goog.events.EventType.MOUSELEAVE\r\n};\r\n\r\n\r\n/**\r\n * An alias for `goog.events.EventType.TOUCH*` event types that is overridden by\r\n * corresponding `POINTER*` event types.\r\n * @enum {string}\r\n */\r\ngoog.events.PointerAsTouchEventType = {\r\n  TOUCHCANCEL: goog.events.PointerTouchFallbackEventType.POINTERCANCEL,\r\n  TOUCHEND: goog.events.PointerTouchFallbackEventType.POINTERUP,\r\n  TOUCHMOVE: goog.events.PointerTouchFallbackEventType.POINTERMOVE,\r\n  TOUCHSTART: goog.events.PointerTouchFallbackEventType.POINTERDOWN\r\n};\r\n","// Copyright 2012 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview An interface for a listenable JavaScript object.\r\n * @author chrishenry@google.com (Chris Henry)\r\n */\r\n\r\ngoog.provide('goog.events.Listenable');\r\ngoog.provide('goog.events.ListenableKey');\r\n\r\n/** @suppress {extraRequire} */\r\ngoog.require('goog.events.EventId');\r\n\r\ngoog.forwardDeclare('goog.events.EventLike');\r\ngoog.forwardDeclare('goog.events.EventTarget');\r\n\r\n\r\n\r\n/**\r\n * A listenable interface. A listenable is an object with the ability\r\n * to dispatch/broadcast events to \"event listeners\" registered via\r\n * listen/listenOnce.\r\n *\r\n * The interface allows for an event propagation mechanism similar\r\n * to one offered by native browser event targets, such as\r\n * capture/bubble mechanism, stopping propagation, and preventing\r\n * default actions. Capture/bubble mechanism depends on the ancestor\r\n * tree constructed via `#getParentEventTarget`; this tree\r\n * must be directed acyclic graph. The meaning of default action(s)\r\n * in preventDefault is specific to a particular use case.\r\n *\r\n * Implementations that do not support capture/bubble or can not have\r\n * a parent listenable can simply not implement any ability to set the\r\n * parent listenable (and have `#getParentEventTarget` return\r\n * null).\r\n *\r\n * Implementation of this class can be used with or independently from\r\n * goog.events.\r\n *\r\n * Implementation must call `#addImplementation(implClass)`.\r\n *\r\n * @interface\r\n * @see goog.events\r\n * @see http://www.w3.org/TR/DOM-Level-2-Events/events.html\r\n */\r\ngoog.events.Listenable = function() {};\r\n\r\n\r\n/**\r\n * An expando property to indicate that an object implements\r\n * goog.events.Listenable.\r\n *\r\n * See addImplementation/isImplementedBy.\r\n *\r\n * @type {string}\r\n * @const\r\n */\r\ngoog.events.Listenable.IMPLEMENTED_BY_PROP =\r\n    'closure_listenable_' + ((Math.random() * 1e6) | 0);\r\n\r\n\r\n/**\r\n * Marks a given class (constructor) as an implementation of\r\n * Listenable, so that we can query that fact at runtime. The class\r\n * must have already implemented the interface.\r\n * @param {function(new:goog.events.Listenable,...)} cls The class constructor.\r\n *     The corresponding class must have already implemented the interface.\r\n */\r\ngoog.events.Listenable.addImplementation = function(cls) {\r\n  cls.prototype[goog.events.Listenable.IMPLEMENTED_BY_PROP] = true;\r\n};\r\n\r\n\r\n/**\r\n * @param {Object} obj The object to check.\r\n * @return {boolean} Whether a given instance implements Listenable. The\r\n *     class/superclass of the instance must call addImplementation.\r\n */\r\ngoog.events.Listenable.isImplementedBy = function(obj) {\r\n  return !!(obj && obj[goog.events.Listenable.IMPLEMENTED_BY_PROP]);\r\n};\r\n\r\n\r\n/**\r\n * Adds an event listener. A listener can only be added once to an\r\n * object and if it is added again the key for the listener is\r\n * returned. Note that if the existing listener is a one-off listener\r\n * (registered via listenOnce), it will no longer be a one-off\r\n * listener after a call to listen().\r\n *\r\n * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.\r\n * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback\r\n *     method.\r\n * @param {boolean=} opt_useCapture Whether to fire in capture phase\r\n *     (defaults to false).\r\n * @param {SCOPE=} opt_listenerScope Object in whose scope to call the\r\n *     listener.\r\n * @return {!goog.events.ListenableKey} Unique key for the listener.\r\n * @template SCOPE,EVENTOBJ\r\n */\r\ngoog.events.Listenable.prototype.listen;\r\n\r\n\r\n/**\r\n * Adds an event listener that is removed automatically after the\r\n * listener fired once.\r\n *\r\n * If an existing listener already exists, listenOnce will do\r\n * nothing. In particular, if the listener was previously registered\r\n * via listen(), listenOnce() will not turn the listener into a\r\n * one-off listener. Similarly, if there is already an existing\r\n * one-off listener, listenOnce does not modify the listeners (it is\r\n * still a once listener).\r\n *\r\n * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.\r\n * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback\r\n *     method.\r\n * @param {boolean=} opt_useCapture Whether to fire in capture phase\r\n *     (defaults to false).\r\n * @param {SCOPE=} opt_listenerScope Object in whose scope to call the\r\n *     listener.\r\n * @return {!goog.events.ListenableKey} Unique key for the listener.\r\n * @template SCOPE,EVENTOBJ\r\n */\r\ngoog.events.Listenable.prototype.listenOnce;\r\n\r\n\r\n/**\r\n * Removes an event listener which was added with listen() or listenOnce().\r\n *\r\n * @param {string|!goog.events.EventId<EVENTOBJ>} type The event type id.\r\n * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener Callback\r\n *     method.\r\n * @param {boolean=} opt_useCapture Whether to fire in capture phase\r\n *     (defaults to false).\r\n * @param {SCOPE=} opt_listenerScope Object in whose scope to call\r\n *     the listener.\r\n * @return {boolean} Whether any listener was removed.\r\n * @template SCOPE,EVENTOBJ\r\n */\r\ngoog.events.Listenable.prototype.unlisten;\r\n\r\n\r\n/**\r\n * Removes an event listener which was added with listen() by the key\r\n * returned by listen().\r\n *\r\n * @param {!goog.events.ListenableKey} key The key returned by\r\n *     listen() or listenOnce().\r\n * @return {boolean} Whether any listener was removed.\r\n */\r\ngoog.events.Listenable.prototype.unlistenByKey;\r\n\r\n\r\n/**\r\n * Dispatches an event (or event like object) and calls all listeners\r\n * listening for events of this type. The type of the event is decided by the\r\n * type property on the event object.\r\n *\r\n * If any of the listeners returns false OR calls preventDefault then this\r\n * function will return false.  If one of the capture listeners calls\r\n * stopPropagation, then the bubble listeners won't fire.\r\n *\r\n * @param {goog.events.EventLike} e Event object.\r\n * @return {boolean} If anyone called preventDefault on the event object (or\r\n *     if any of the listeners returns false) this will also return false.\r\n */\r\ngoog.events.Listenable.prototype.dispatchEvent;\r\n\r\n\r\n/**\r\n * Removes all listeners from this listenable. If type is specified,\r\n * it will only remove listeners of the particular type. otherwise all\r\n * registered listeners will be removed.\r\n *\r\n * @param {string=} opt_type Type of event to remove, default is to\r\n *     remove all types.\r\n * @return {number} Number of listeners removed.\r\n */\r\ngoog.events.Listenable.prototype.removeAllListeners;\r\n\r\n\r\n/**\r\n * Returns the parent of this event target to use for capture/bubble\r\n * mechanism.\r\n *\r\n * NOTE(chrishenry): The name reflects the original implementation of\r\n * custom event target (`goog.events.EventTarget`). We decided\r\n * that changing the name is not worth it.\r\n *\r\n * @return {goog.events.Listenable} The parent EventTarget or null if\r\n *     there is no parent.\r\n */\r\ngoog.events.Listenable.prototype.getParentEventTarget;\r\n\r\n\r\n/**\r\n * Fires all registered listeners in this listenable for the given\r\n * type and capture mode, passing them the given eventObject. This\r\n * does not perform actual capture/bubble. Only implementors of the\r\n * interface should be using this.\r\n *\r\n * @param {string|!goog.events.EventId<EVENTOBJ>} type The type of the\r\n *     listeners to fire.\r\n * @param {boolean} capture The capture mode of the listeners to fire.\r\n * @param {EVENTOBJ} eventObject The event object to fire.\r\n * @return {boolean} Whether all listeners succeeded without\r\n *     attempting to prevent default behavior. If any listener returns\r\n *     false or called goog.events.Event#preventDefault, this returns\r\n *     false.\r\n * @template EVENTOBJ\r\n */\r\ngoog.events.Listenable.prototype.fireListeners;\r\n\r\n\r\n/**\r\n * Gets all listeners in this listenable for the given type and\r\n * capture mode.\r\n *\r\n * @param {string|!goog.events.EventId} type The type of the listeners to fire.\r\n * @param {boolean} capture The capture mode of the listeners to fire.\r\n * @return {!Array<!goog.events.ListenableKey>} An array of registered\r\n *     listeners.\r\n * @template EVENTOBJ\r\n */\r\ngoog.events.Listenable.prototype.getListeners;\r\n\r\n\r\n/**\r\n * Gets the goog.events.ListenableKey for the event or null if no such\r\n * listener is in use.\r\n *\r\n * @param {string|!goog.events.EventId<EVENTOBJ>} type The name of the event\r\n *     without the 'on' prefix.\r\n * @param {function(this:SCOPE, EVENTOBJ):(boolean|undefined)} listener The\r\n *     listener function to get.\r\n * @param {boolean} capture Whether the listener is a capturing listener.\r\n * @param {SCOPE=} opt_listenerScope Object in whose scope to call the\r\n *     listener.\r\n * @return {goog.events.ListenableKey} the found listener or null if not found.\r\n * @template SCOPE,EVENTOBJ\r\n */\r\ngoog.events.Listenable.prototype.getListener;\r\n\r\n\r\n/**\r\n * Whether there is any active listeners matching the specified\r\n * signature. If either the type or capture parameters are\r\n * unspecified, the function will match on the remaining criteria.\r\n *\r\n * @param {string|!goog.events.EventId<EVENTOBJ>=} opt_type Event type.\r\n * @param {boolean=} opt_capture Whether to check for capture or bubble\r\n *     listeners.\r\n * @return {boolean} Whether there is any active listeners matching\r\n *     the requested type and/or capture phase.\r\n * @template EVENTOBJ\r\n */\r\ngoog.events.Listenable.prototype.hasListener;\r\n\r\n\r\n\r\n/**\r\n * An interface that describes a single registered listener.\r\n * @interface\r\n */\r\ngoog.events.ListenableKey = function() {};\r\n\r\n\r\n/**\r\n * Counter used to create a unique key\r\n * @type {number}\r\n * @private\r\n */\r\ngoog.events.ListenableKey.counter_ = 0;\r\n\r\n\r\n/**\r\n * Reserves a key to be used for ListenableKey#key field.\r\n * @return {number} A number to be used to fill ListenableKey#key\r\n *     field.\r\n */\r\ngoog.events.ListenableKey.reserveKey = function() {\r\n  return ++goog.events.ListenableKey.counter_;\r\n};\r\n\r\n\r\n/**\r\n * The source event target.\r\n * @type {Object|goog.events.Listenable|goog.events.EventTarget}\r\n */\r\ngoog.events.ListenableKey.prototype.src;\r\n\r\n\r\n/**\r\n * The event type the listener is listening to.\r\n * @type {string}\r\n */\r\ngoog.events.ListenableKey.prototype.type;\r\n\r\n\r\n/**\r\n * The listener function.\r\n * @type {function(?):?|{handleEvent:function(?):?}|null}\r\n */\r\ngoog.events.ListenableKey.prototype.listener;\r\n\r\n\r\n/**\r\n * Whether the listener works on capture phase.\r\n * @type {boolean}\r\n */\r\ngoog.events.ListenableKey.prototype.capture;\r\n\r\n\r\n/**\r\n * The 'this' object for the listener function's scope.\r\n * @type {Object|undefined}\r\n */\r\ngoog.events.ListenableKey.prototype.handler;\r\n\r\n\r\n/**\r\n * A globally unique number to identify the key.\r\n * @type {number}\r\n */\r\ngoog.events.ListenableKey.prototype.key;\r\n","// Copyright 2005 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Listener object.\r\n * @see ../demos/events.html\r\n */\r\n\r\ngoog.provide('goog.events.Listener');\r\n\r\ngoog.require('goog.events.ListenableKey');\r\n\r\n\r\n\r\n/**\r\n * Simple class that stores information about a listener\r\n * @param {function(?):?} listener Callback function.\r\n * @param {Function} proxy Wrapper for the listener that patches the event.\r\n * @param {EventTarget|goog.events.Listenable} src Source object for\r\n *     the event.\r\n * @param {string} type Event type.\r\n * @param {boolean} capture Whether in capture or bubble phase.\r\n * @param {Object=} opt_handler Object in whose context to execute the callback.\r\n * @implements {goog.events.ListenableKey}\r\n * @constructor\r\n */\r\ngoog.events.Listener = function(\r\n    listener, proxy, src, type, capture, opt_handler) {\r\n  if (goog.events.Listener.ENABLE_MONITORING) {\r\n    this.creationStack = new Error().stack;\r\n  }\r\n\r\n  /** @override */\r\n  this.listener = listener;\r\n\r\n  /**\r\n   * A wrapper over the original listener. This is used solely to\r\n   * handle native browser events (it is used to simulate the capture\r\n   * phase and to patch the event object).\r\n   * @type {Function}\r\n   */\r\n  this.proxy = proxy;\r\n\r\n  /**\r\n   * Object or node that callback is listening to\r\n   * @type {EventTarget|goog.events.Listenable}\r\n   */\r\n  this.src = src;\r\n\r\n  /**\r\n   * The event type.\r\n   * @const {string}\r\n   */\r\n  this.type = type;\r\n\r\n  /**\r\n   * Whether the listener is being called in the capture or bubble phase\r\n   * @const {boolean}\r\n   */\r\n  this.capture = !!capture;\r\n\r\n  /**\r\n   * Optional object whose context to execute the listener in\r\n   * @type {Object|undefined}\r\n   */\r\n  this.handler = opt_handler;\r\n\r\n  /**\r\n   * The key of the listener.\r\n   * @const {number}\r\n   * @override\r\n   */\r\n  this.key = goog.events.ListenableKey.reserveKey();\r\n\r\n  /**\r\n   * Whether to remove the listener after it has been called.\r\n   * @type {boolean}\r\n   */\r\n  this.callOnce = false;\r\n\r\n  /**\r\n   * Whether the listener has been removed.\r\n   * @type {boolean}\r\n   */\r\n  this.removed = false;\r\n};\r\n\r\n\r\n/**\r\n * @define {boolean} Whether to enable the monitoring of the\r\n *     goog.events.Listener instances. Switching on the monitoring is only\r\n *     recommended for debugging because it has a significant impact on\r\n *     performance and memory usage. If switched off, the monitoring code\r\n *     compiles down to 0 bytes.\r\n */\r\ngoog.events.Listener.ENABLE_MONITORING =\r\n    goog.define('goog.events.Listener.ENABLE_MONITORING', false);\r\n\r\n\r\n/**\r\n * If monitoring the goog.events.Listener instances is enabled, stores the\r\n * creation stack trace of the Disposable instance.\r\n * @type {string}\r\n */\r\ngoog.events.Listener.prototype.creationStack;\r\n\r\n\r\n/**\r\n * Marks this listener as removed. This also remove references held by\r\n * this listener object (such as listener and event source).\r\n */\r\ngoog.events.Listener.prototype.markAsRemoved = function() {\r\n  this.removed = true;\r\n  this.listener = null;\r\n  this.proxy = null;\r\n  this.src = null;\r\n  this.handler = null;\r\n};\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview A map of listeners that provides utility functions to\r\n * deal with listeners on an event target. Used by\r\n * `goog.events.EventTarget`.\r\n *\r\n * WARNING: Do not use this class from outside goog.events package.\r\n */\r\n\r\ngoog.provide('goog.events.ListenerMap');\r\n\r\ngoog.require('goog.array');\r\ngoog.require('goog.events.Listener');\r\ngoog.require('goog.object');\r\n\r\n\r\n\r\n/**\r\n * Creates a new listener map.\r\n * @param {EventTarget|goog.events.Listenable} src The src object.\r\n * @constructor\r\n * @final\r\n */\r\ngoog.events.ListenerMap = function(src) {\r\n  /** @type {EventTarget|goog.events.Listenable} */\r\n  this.src = src;\r\n\r\n  /**\r\n   * Maps of event type to an array of listeners.\r\n   * @type {!Object<string, !Array<!goog.events.Listener>>}\r\n   */\r\n  this.listeners = {};\r\n\r\n  /**\r\n   * The count of types in this map that have registered listeners.\r\n   * @private {number}\r\n   */\r\n  this.typeCount_ = 0;\r\n};\r\n\r\n\r\n/**\r\n * @return {number} The count of event types in this map that actually\r\n *     have registered listeners.\r\n */\r\ngoog.events.ListenerMap.prototype.getTypeCount = function() {\r\n  return this.typeCount_;\r\n};\r\n\r\n\r\n/**\r\n * @return {number} Total number of registered listeners.\r\n */\r\ngoog.events.ListenerMap.prototype.getListenerCount = function() {\r\n  var count = 0;\r\n  for (var type in this.listeners) {\r\n    count += this.listeners[type].length;\r\n  }\r\n  return count;\r\n};\r\n\r\n\r\n/**\r\n * Adds an event listener. A listener can only be added once to an\r\n * object and if it is added again the key for the listener is\r\n * returned.\r\n *\r\n * Note that a one-off listener will not change an existing listener,\r\n * if any. On the other hand a normal listener will change existing\r\n * one-off listener to become a normal listener.\r\n *\r\n * @param {string|!goog.events.EventId} type The listener event type.\r\n * @param {!Function} listener This listener callback method.\r\n * @param {boolean} callOnce Whether the listener is a one-off\r\n *     listener.\r\n * @param {boolean=} opt_useCapture The capture mode of the listener.\r\n * @param {Object=} opt_listenerScope Object in whose scope to call the\r\n *     listener.\r\n * @return {!goog.events.ListenableKey} Unique key for the listener.\r\n */\r\ngoog.events.ListenerMap.prototype.add = function(\r\n    type, listener, callOnce, opt_useCapture, opt_listenerScope) {\r\n  var typeStr = type.toString();\r\n  var listenerArray = this.listeners[typeStr];\r\n  if (!listenerArray) {\r\n    listenerArray = this.listeners[typeStr] = [];\r\n    this.typeCount_++;\r\n  }\r\n\r\n  var listenerObj;\r\n  var index = goog.events.ListenerMap.findListenerIndex_(\r\n      listenerArray, listener, opt_useCapture, opt_listenerScope);\r\n  if (index > -1) {\r\n    listenerObj = listenerArray[index];\r\n    if (!callOnce) {\r\n      // Ensure that, if there is an existing callOnce listener, it is no\r\n      // longer a callOnce listener.\r\n      listenerObj.callOnce = false;\r\n    }\r\n  } else {\r\n    listenerObj = new goog.events.Listener(\r\n        listener, null, this.src, typeStr, !!opt_useCapture, opt_listenerScope);\r\n    listenerObj.callOnce = callOnce;\r\n    listenerArray.push(listenerObj);\r\n  }\r\n  return listenerObj;\r\n};\r\n\r\n\r\n/**\r\n * Removes a matching listener.\r\n * @param {string|!goog.events.EventId} type The listener event type.\r\n * @param {!Function} listener This listener callback method.\r\n * @param {boolean=} opt_useCapture The capture mode of the listener.\r\n * @param {Object=} opt_listenerScope Object in whose scope to call the\r\n *     listener.\r\n * @return {boolean} Whether any listener was removed.\r\n */\r\ngoog.events.ListenerMap.prototype.remove = function(\r\n    type, listener, opt_useCapture, opt_listenerScope) {\r\n  var typeStr = type.toString();\r\n  if (!(typeStr in this.listeners)) {\r\n    return false;\r\n  }\r\n\r\n  var listenerArray = this.listeners[typeStr];\r\n  var index = goog.events.ListenerMap.findListenerIndex_(\r\n      listenerArray, listener, opt_useCapture, opt_listenerScope);\r\n  if (index > -1) {\r\n    var listenerObj = listenerArray[index];\r\n    listenerObj.markAsRemoved();\r\n    goog.array.removeAt(listenerArray, index);\r\n    if (listenerArray.length == 0) {\r\n      delete this.listeners[typeStr];\r\n      this.typeCount_--;\r\n    }\r\n    return true;\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Removes the given listener object.\r\n * @param {!goog.events.ListenableKey} listener The listener to remove.\r\n * @return {boolean} Whether the listener is removed.\r\n */\r\ngoog.events.ListenerMap.prototype.removeByKey = function(listener) {\r\n  var type = listener.type;\r\n  if (!(type in this.listeners)) {\r\n    return false;\r\n  }\r\n\r\n  var removed = goog.array.remove(this.listeners[type], listener);\r\n  if (removed) {\r\n    /** @type {!goog.events.Listener} */ (listener).markAsRemoved();\r\n    if (this.listeners[type].length == 0) {\r\n      delete this.listeners[type];\r\n      this.typeCount_--;\r\n    }\r\n  }\r\n  return removed;\r\n};\r\n\r\n\r\n/**\r\n * Removes all listeners from this map. If opt_type is provided, only\r\n * listeners that match the given type are removed.\r\n * @param {string|!goog.events.EventId=} opt_type Type of event to remove.\r\n * @return {number} Number of listeners removed.\r\n */\r\ngoog.events.ListenerMap.prototype.removeAll = function(opt_type) {\r\n  var typeStr = opt_type && opt_type.toString();\r\n  var count = 0;\r\n  for (var type in this.listeners) {\r\n    if (!typeStr || type == typeStr) {\r\n      var listenerArray = this.listeners[type];\r\n      for (var i = 0; i < listenerArray.length; i++) {\r\n        ++count;\r\n        listenerArray[i].markAsRemoved();\r\n      }\r\n      delete this.listeners[type];\r\n      this.typeCount_--;\r\n    }\r\n  }\r\n  return count;\r\n};\r\n\r\n\r\n/**\r\n * Gets all listeners that match the given type and capture mode. The\r\n * returned array is a copy (but the listener objects are not).\r\n * @param {string|!goog.events.EventId} type The type of the listeners\r\n *     to retrieve.\r\n * @param {boolean} capture The capture mode of the listeners to retrieve.\r\n * @return {!Array<!goog.events.ListenableKey>} An array of matching\r\n *     listeners.\r\n */\r\ngoog.events.ListenerMap.prototype.getListeners = function(type, capture) {\r\n  var listenerArray = this.listeners[type.toString()];\r\n  var rv = [];\r\n  if (listenerArray) {\r\n    for (var i = 0; i < listenerArray.length; ++i) {\r\n      var listenerObj = listenerArray[i];\r\n      if (listenerObj.capture == capture) {\r\n        rv.push(listenerObj);\r\n      }\r\n    }\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Gets the goog.events.ListenableKey for the event or null if no such\r\n * listener is in use.\r\n *\r\n * @param {string|!goog.events.EventId} type The type of the listener\r\n *     to retrieve.\r\n * @param {!Function} listener The listener function to get.\r\n * @param {boolean} capture Whether the listener is a capturing listener.\r\n * @param {Object=} opt_listenerScope Object in whose scope to call the\r\n *     listener.\r\n * @return {goog.events.ListenableKey} the found listener or null if not found.\r\n */\r\ngoog.events.ListenerMap.prototype.getListener = function(\r\n    type, listener, capture, opt_listenerScope) {\r\n  var listenerArray = this.listeners[type.toString()];\r\n  var i = -1;\r\n  if (listenerArray) {\r\n    i = goog.events.ListenerMap.findListenerIndex_(\r\n        listenerArray, listener, capture, opt_listenerScope);\r\n  }\r\n  return i > -1 ? listenerArray[i] : null;\r\n};\r\n\r\n\r\n/**\r\n * Whether there is a matching listener. If either the type or capture\r\n * parameters are unspecified, the function will match on the\r\n * remaining criteria.\r\n *\r\n * @param {string|!goog.events.EventId=} opt_type The type of the listener.\r\n * @param {boolean=} opt_capture The capture mode of the listener.\r\n * @return {boolean} Whether there is an active listener matching\r\n *     the requested type and/or capture phase.\r\n */\r\ngoog.events.ListenerMap.prototype.hasListener = function(\r\n    opt_type, opt_capture) {\r\n  var hasType = goog.isDef(opt_type);\r\n  var typeStr = hasType ? opt_type.toString() : '';\r\n  var hasCapture = goog.isDef(opt_capture);\r\n\r\n  return goog.object.some(this.listeners, function(listenerArray, type) {\r\n    for (var i = 0; i < listenerArray.length; ++i) {\r\n      if ((!hasType || listenerArray[i].type == typeStr) &&\r\n          (!hasCapture || listenerArray[i].capture == opt_capture)) {\r\n        return true;\r\n      }\r\n    }\r\n\r\n    return false;\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Finds the index of a matching goog.events.Listener in the given\r\n * listenerArray.\r\n * @param {!Array<!goog.events.Listener>} listenerArray Array of listener.\r\n * @param {!Function} listener The listener function.\r\n * @param {boolean=} opt_useCapture The capture flag for the listener.\r\n * @param {Object=} opt_listenerScope The listener scope.\r\n * @return {number} The index of the matching listener within the\r\n *     listenerArray.\r\n * @private\r\n */\r\ngoog.events.ListenerMap.findListenerIndex_ = function(\r\n    listenerArray, listener, opt_useCapture, opt_listenerScope) {\r\n  for (var i = 0; i < listenerArray.length; ++i) {\r\n    var listenerObj = listenerArray[i];\r\n    if (!listenerObj.removed && listenerObj.listener == listener &&\r\n        listenerObj.capture == !!opt_useCapture &&\r\n        listenerObj.handler == opt_listenerScope) {\r\n      return i;\r\n    }\r\n  }\r\n  return -1;\r\n};\r\n","// Copyright 2005 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview An event manager for both native browser event\r\n * targets and custom JavaScript event targets\r\n * (`goog.events.Listenable`). This provides an abstraction\r\n * over browsers' event systems.\r\n *\r\n * It also provides a simulation of W3C event model's capture phase in\r\n * Internet Explorer (IE 8 and below). Caveat: the simulation does not\r\n * interact well with listeners registered directly on the elements\r\n * (bypassing goog.events) or even with listeners registered via\r\n * goog.events in a separate JS binary. In these cases, we provide\r\n * no ordering guarantees.\r\n *\r\n * The listeners will receive a \"patched\" event object. Such event object\r\n * contains normalized values for certain event properties that differs in\r\n * different browsers.\r\n *\r\n * Example usage:\r\n * <pre>\r\n * goog.events.listen(myNode, 'click', function(e) { alert('woo') });\r\n * goog.events.listen(myNode, 'mouseover', mouseHandler, true);\r\n * goog.events.unlisten(myNode, 'mouseover', mouseHandler, true);\r\n * goog.events.removeAll(myNode);\r\n * </pre>\r\n *\r\n *                                            in IE and event object patching]\r\n * @author arv@google.com (Erik Arvidsson)\r\n *\r\n * @see ../demos/events.html\r\n * @see ../demos/event-propagation.html\r\n * @see ../demos/stopevent.html\r\n */\r\n\r\n// IMPLEMENTATION NOTES:\r\n// goog.events stores an auxiliary data structure on each EventTarget\r\n// source being listened on. This allows us to take advantage of GC,\r\n// having the data structure GC'd when the EventTarget is GC'd. This\r\n// GC behavior is equivalent to using W3C DOM Events directly.\r\n\r\ngoog.provide('goog.events');\r\ngoog.provide('goog.events.CaptureSimulationMode');\r\ngoog.provide('goog.events.Key');\r\ngoog.provide('goog.events.ListenableType');\r\n\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.debug.entryPointRegistry');\r\ngoog.require('goog.events.BrowserEvent');\r\ngoog.require('goog.events.BrowserFeature');\r\ngoog.require('goog.events.Listenable');\r\ngoog.require('goog.events.ListenerMap');\r\n\r\ngoog.forwardDeclare('goog.debug.ErrorHandler');\r\ngoog.forwardDeclare('goog.events.EventWrapper');\r\n\r\n\r\n/**\r\n * @typedef {number|goog.events.ListenableKey}\r\n */\r\ngoog.events.Key;\r\n\r\n\r\n/**\r\n * @typedef {EventTarget|goog.events.Listenable}\r\n */\r\ngoog.events.ListenableType;\r\n\r\n\r\n/**\r\n * Property name on a native event target for the listener map\r\n * associated with the event target.\r\n * @private @const {string}\r\n */\r\ngoog.events.LISTENER_MAP_PROP_ = 'closure_lm_' + ((Math.random() * 1e6) | 0);\r\n\r\n\r\n/**\r\n * String used to prepend to IE event types.\r\n * @const\r\n * @private\r\n */\r\ngoog.events.onString_ = 'on';\r\n\r\n\r\n/**\r\n * Map of computed \"on<eventname>\" strings for IE event types. Caching\r\n * this removes an extra object allocation in goog.events.listen which\r\n * improves IE6 performance.\r\n * @const\r\n * @dict\r\n * @private\r\n */\r\ngoog.events.onStringMap_ = {};\r\n\r\n\r\n/**\r\n * @enum {number} Different capture simulation mode for IE8-.\r\n */\r\ngoog.events.CaptureSimulationMode = {\r\n  /**\r\n   * Does not perform capture simulation. Will asserts in IE8- when you\r\n   * add capture listeners.\r\n   */\r\n  OFF_AND_FAIL: 0,\r\n\r\n  /**\r\n   * Does not perform capture simulation, silently ignore capture\r\n   * listeners.\r\n   */\r\n  OFF_AND_SILENT: 1,\r\n\r\n  /**\r\n   * Performs capture simulation.\r\n   */\r\n  ON: 2\r\n};\r\n\r\n\r\n/**\r\n * @define {number} The capture simulation mode for IE8-. By default,\r\n *     this is ON.\r\n */\r\ngoog.events.CAPTURE_SIMULATION_MODE =\r\n    goog.define('goog.events.CAPTURE_SIMULATION_MODE', 2);\r\n\r\n\r\n/**\r\n * Estimated count of total native listeners.\r\n * @private {number}\r\n */\r\ngoog.events.listenerCountEstimate_ = 0;\r\n\r\n\r\n/**\r\n * Adds an event listener for a specific event on a native event\r\n * target (such as a DOM element) or an object that has implemented\r\n * {@link goog.events.Listenable}. A listener can only be added once\r\n * to an object and if it is added again the key for the listener is\r\n * returned. Note that if the existing listener is a one-off listener\r\n * (registered via listenOnce), it will no longer be a one-off\r\n * listener after a call to listen().\r\n *\r\n * @param {EventTarget|goog.events.Listenable} src The node to listen\r\n *     to events on.\r\n * @param {string|Array<string>|\r\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\r\n *     type Event type or array of event types.\r\n * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}\r\n *     listener Callback method, or an object with a handleEvent function.\r\n *     WARNING: passing an Object is now softly deprecated.\r\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\r\n * @param {T=} opt_handler Element in whose scope to call the listener.\r\n * @return {goog.events.Key} Unique key for the listener.\r\n * @template T,EVENTOBJ\r\n */\r\ngoog.events.listen = function(src, type, listener, opt_options, opt_handler) {\r\n  if (opt_options && opt_options.once) {\r\n    return goog.events.listenOnce(\r\n        src, type, listener, opt_options, opt_handler);\r\n  }\r\n  if (goog.isArray(type)) {\r\n    for (var i = 0; i < type.length; i++) {\r\n      goog.events.listen(src, type[i], listener, opt_options, opt_handler);\r\n    }\r\n    return null;\r\n  }\r\n\r\n  listener = goog.events.wrapListener(listener);\r\n  if (goog.events.Listenable.isImplementedBy(src)) {\r\n    var capture =\r\n        goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\r\n    return src.listen(\r\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\r\n        opt_handler);\r\n  } else {\r\n    return goog.events.listen_(\r\n        /** @type {!EventTarget} */ (src), type, listener,\r\n        /* callOnce */ false, opt_options, opt_handler);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Adds an event listener for a specific event on a native event\r\n * target. A listener can only be added once to an object and if it\r\n * is added again the key for the listener is returned.\r\n *\r\n * Note that a one-off listener will not change an existing listener,\r\n * if any. On the other hand a normal listener will change existing\r\n * one-off listener to become a normal listener.\r\n *\r\n * @param {EventTarget} src The node to listen to events on.\r\n * @param {string|?goog.events.EventId<EVENTOBJ>} type Event type.\r\n * @param {!Function} listener Callback function.\r\n * @param {boolean} callOnce Whether the listener is a one-off\r\n *     listener or otherwise.\r\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\r\n * @param {Object=} opt_handler Element in whose scope to call the listener.\r\n * @return {goog.events.ListenableKey} Unique key for the listener.\r\n * @template EVENTOBJ\r\n * @private\r\n */\r\ngoog.events.listen_ = function(\r\n    src, type, listener, callOnce, opt_options, opt_handler) {\r\n  if (!type) {\r\n    throw new Error('Invalid event type');\r\n  }\r\n\r\n  var capture =\r\n      goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\r\n  if (capture && !goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {\r\n    if (goog.events.CAPTURE_SIMULATION_MODE ==\r\n        goog.events.CaptureSimulationMode.OFF_AND_FAIL) {\r\n      goog.asserts.fail('Can not register capture listener in IE8-.');\r\n      return null;\r\n    } else if (\r\n        goog.events.CAPTURE_SIMULATION_MODE ==\r\n        goog.events.CaptureSimulationMode.OFF_AND_SILENT) {\r\n      return null;\r\n    }\r\n  }\r\n\r\n  var listenerMap = goog.events.getListenerMap_(src);\r\n  if (!listenerMap) {\r\n    src[goog.events.LISTENER_MAP_PROP_] = listenerMap =\r\n        new goog.events.ListenerMap(src);\r\n  }\r\n\r\n  var listenerObj = /** @type {goog.events.Listener} */ (\r\n      listenerMap.add(type, listener, callOnce, capture, opt_handler));\r\n\r\n  // If the listenerObj already has a proxy, it has been set up\r\n  // previously. We simply return.\r\n  if (listenerObj.proxy) {\r\n    return listenerObj;\r\n  }\r\n\r\n  var proxy = goog.events.getProxy();\r\n  listenerObj.proxy = proxy;\r\n\r\n  proxy.src = src;\r\n  proxy.listener = listenerObj;\r\n\r\n  // Attach the proxy through the browser's API\r\n  if (src.addEventListener) {\r\n    // Don't pass an object as `capture` if the browser doesn't support that.\r\n    if (!goog.events.BrowserFeature.PASSIVE_EVENTS) {\r\n      opt_options = capture;\r\n    }\r\n    // Don't break tests that expect a boolean.\r\n    if (opt_options === undefined) opt_options = false;\r\n    src.addEventListener(type.toString(), proxy, opt_options);\r\n  } else if (src.attachEvent) {\r\n    // The else if above used to be an unconditional else. It would call\r\n    // exception on IE11, spoiling the day of some callers. The previous\r\n    // incarnation of this code, from 2007, indicates that it replaced an\r\n    // earlier still version that caused excess allocations on IE6.\r\n    src.attachEvent(goog.events.getOnString_(type.toString()), proxy);\r\n  } else if (src.addListener && src.removeListener) {\r\n    // In IE, MediaQueryList uses addListener() insteadd of addEventListener. In\r\n    // Safari, there is no global for the MediaQueryList constructor, so we just\r\n    // check whether the object \"looks like\" MediaQueryList.\r\n    goog.asserts.assert(\r\n        type === 'change', 'MediaQueryList only has a change event');\r\n    src.addListener(proxy);\r\n  } else {\r\n    throw new Error('addEventListener and attachEvent are unavailable.');\r\n  }\r\n\r\n  goog.events.listenerCountEstimate_++;\r\n  return listenerObj;\r\n};\r\n\r\n\r\n/**\r\n * Helper function for returning a proxy function.\r\n * @return {!Function} A new or reused function object.\r\n */\r\ngoog.events.getProxy = function() {\r\n  var proxyCallbackFunction = goog.events.handleBrowserEvent_;\r\n  // Use a local var f to prevent one allocation.\r\n  var f =\r\n      goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT ? function(eventObject) {\r\n        return proxyCallbackFunction.call(f.src, f.listener, eventObject);\r\n      } : function(eventObject) {\r\n        var v = proxyCallbackFunction.call(f.src, f.listener, eventObject);\r\n        // NOTE(chrishenry): In IE, we hack in a capture phase. However, if\r\n        // there is inline event handler which tries to prevent default (for\r\n        // example <a href=\"...\" onclick=\"return false\">...</a>) in a\r\n        // descendant element, the prevent default will be overridden\r\n        // by this listener if this listener were to return true. Hence, we\r\n        // return undefined.\r\n        if (!v) return v;\r\n      };\r\n  return f;\r\n};\r\n\r\n\r\n/**\r\n * Adds an event listener for a specific event on a native event\r\n * target (such as a DOM element) or an object that has implemented\r\n * {@link goog.events.Listenable}. After the event has fired the event\r\n * listener is removed from the target.\r\n *\r\n * If an existing listener already exists, listenOnce will do\r\n * nothing. In particular, if the listener was previously registered\r\n * via listen(), listenOnce() will not turn the listener into a\r\n * one-off listener. Similarly, if there is already an existing\r\n * one-off listener, listenOnce does not modify the listeners (it is\r\n * still a once listener).\r\n *\r\n * @param {EventTarget|goog.events.Listenable} src The node to listen\r\n *     to events on.\r\n * @param {string|Array<string>|\r\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\r\n *     type Event type or array of event types.\r\n * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(?):?}|null}\r\n *     listener Callback method.\r\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\r\n * @param {T=} opt_handler Element in whose scope to call the listener.\r\n * @return {goog.events.Key} Unique key for the listener.\r\n * @template T,EVENTOBJ\r\n */\r\ngoog.events.listenOnce = function(\r\n    src, type, listener, opt_options, opt_handler) {\r\n  if (goog.isArray(type)) {\r\n    for (var i = 0; i < type.length; i++) {\r\n      goog.events.listenOnce(src, type[i], listener, opt_options, opt_handler);\r\n    }\r\n    return null;\r\n  }\r\n\r\n  listener = goog.events.wrapListener(listener);\r\n  if (goog.events.Listenable.isImplementedBy(src)) {\r\n    var capture =\r\n        goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\r\n    return src.listenOnce(\r\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\r\n        opt_handler);\r\n  } else {\r\n    return goog.events.listen_(\r\n        /** @type {!EventTarget} */ (src), type, listener,\r\n        /* callOnce */ true, opt_options, opt_handler);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Adds an event listener with a specific event wrapper on a DOM Node or an\r\n * object that has implemented {@link goog.events.Listenable}. A listener can\r\n * only be added once to an object.\r\n *\r\n * @param {EventTarget|goog.events.Listenable} src The target to\r\n *     listen to events on.\r\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\r\n * @param {function(this:T, ?):?|{handleEvent:function(?):?}|null} listener\r\n *     Callback method, or an object with a handleEvent function.\r\n * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to\r\n *     false).\r\n * @param {T=} opt_handler Element in whose scope to call the listener.\r\n * @template T\r\n */\r\ngoog.events.listenWithWrapper = function(\r\n    src, wrapper, listener, opt_capt, opt_handler) {\r\n  wrapper.listen(src, listener, opt_capt, opt_handler);\r\n};\r\n\r\n\r\n/**\r\n * Removes an event listener which was added with listen().\r\n *\r\n * @param {EventTarget|goog.events.Listenable} src The target to stop\r\n *     listening to events on.\r\n * @param {string|Array<string>|\r\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\r\n *     type Event type or array of event types to unlisten to.\r\n * @param {function(?):?|{handleEvent:function(?):?}|null} listener The\r\n *     listener function to remove.\r\n * @param {(boolean|!EventListenerOptions)=} opt_options\r\n *     whether the listener is fired during the capture or bubble phase of the\r\n *     event.\r\n * @param {Object=} opt_handler Element in whose scope to call the listener.\r\n * @return {?boolean} indicating whether the listener was there to remove.\r\n * @template EVENTOBJ\r\n */\r\ngoog.events.unlisten = function(src, type, listener, opt_options, opt_handler) {\r\n  if (goog.isArray(type)) {\r\n    for (var i = 0; i < type.length; i++) {\r\n      goog.events.unlisten(src, type[i], listener, opt_options, opt_handler);\r\n    }\r\n    return null;\r\n  }\r\n  var capture =\r\n      goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\r\n\r\n  listener = goog.events.wrapListener(listener);\r\n  if (goog.events.Listenable.isImplementedBy(src)) {\r\n    return src.unlisten(\r\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\r\n        opt_handler);\r\n  }\r\n\r\n  if (!src) {\r\n    // TODO(chrishenry): We should tighten the API to only accept\r\n    // non-null objects, or add an assertion here.\r\n    return false;\r\n  }\r\n\r\n  var listenerMap = goog.events.getListenerMap_(\r\n      /** @type {!EventTarget} */ (src));\r\n  if (listenerMap) {\r\n    var listenerObj = listenerMap.getListener(\r\n        /** @type {string|!goog.events.EventId} */ (type), listener, capture,\r\n        opt_handler);\r\n    if (listenerObj) {\r\n      return goog.events.unlistenByKey(listenerObj);\r\n    }\r\n  }\r\n\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Removes an event listener which was added with listen() by the key\r\n * returned by listen().\r\n *\r\n * @param {goog.events.Key} key The key returned by listen() for this\r\n *     event listener.\r\n * @return {boolean} indicating whether the listener was there to remove.\r\n */\r\ngoog.events.unlistenByKey = function(key) {\r\n  // TODO(chrishenry): Remove this check when tests that rely on this\r\n  // are fixed.\r\n  if (goog.isNumber(key)) {\r\n    return false;\r\n  }\r\n\r\n  var listener = key;\r\n  if (!listener || listener.removed) {\r\n    return false;\r\n  }\r\n\r\n  var src = listener.src;\r\n  if (goog.events.Listenable.isImplementedBy(src)) {\r\n    return /** @type {!goog.events.Listenable} */ (src).unlistenByKey(listener);\r\n  }\r\n\r\n  var type = listener.type;\r\n  var proxy = listener.proxy;\r\n  if (src.removeEventListener) {\r\n    src.removeEventListener(type, proxy, listener.capture);\r\n  } else if (src.detachEvent) {\r\n    src.detachEvent(goog.events.getOnString_(type), proxy);\r\n  } else if (src.addListener && src.removeListener) {\r\n    src.removeListener(proxy);\r\n  }\r\n  goog.events.listenerCountEstimate_--;\r\n\r\n  var listenerMap = goog.events.getListenerMap_(\r\n      /** @type {!EventTarget} */ (src));\r\n  // TODO(chrishenry): Try to remove this conditional and execute the\r\n  // first branch always. This should be safe.\r\n  if (listenerMap) {\r\n    listenerMap.removeByKey(listener);\r\n    if (listenerMap.getTypeCount() == 0) {\r\n      // Null the src, just because this is simple to do (and useful\r\n      // for IE <= 7).\r\n      listenerMap.src = null;\r\n      // We don't use delete here because IE does not allow delete\r\n      // on a window object.\r\n      src[goog.events.LISTENER_MAP_PROP_] = null;\r\n    }\r\n  } else {\r\n    /** @type {!goog.events.Listener} */ (listener).markAsRemoved();\r\n  }\r\n\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * Removes an event listener which was added with listenWithWrapper().\r\n *\r\n * @param {EventTarget|goog.events.Listenable} src The target to stop\r\n *     listening to events on.\r\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\r\n * @param {function(?):?|{handleEvent:function(?):?}|null} listener The\r\n *     listener function to remove.\r\n * @param {boolean=} opt_capt In DOM-compliant browsers, this determines\r\n *     whether the listener is fired during the capture or bubble phase of the\r\n *     event.\r\n * @param {Object=} opt_handler Element in whose scope to call the listener.\r\n */\r\ngoog.events.unlistenWithWrapper = function(\r\n    src, wrapper, listener, opt_capt, opt_handler) {\r\n  wrapper.unlisten(src, listener, opt_capt, opt_handler);\r\n};\r\n\r\n\r\n/**\r\n * Removes all listeners from an object. You can also optionally\r\n * remove listeners of a particular type.\r\n *\r\n * @param {Object|undefined} obj Object to remove listeners from. Must be an\r\n *     EventTarget or a goog.events.Listenable.\r\n * @param {string|!goog.events.EventId=} opt_type Type of event to remove.\r\n *     Default is all types.\r\n * @return {number} Number of listeners removed.\r\n */\r\ngoog.events.removeAll = function(obj, opt_type) {\r\n  // TODO(chrishenry): Change the type of obj to\r\n  // (!EventTarget|!goog.events.Listenable).\r\n\r\n  if (!obj) {\r\n    return 0;\r\n  }\r\n\r\n  if (goog.events.Listenable.isImplementedBy(obj)) {\r\n    return /** @type {?} */ (obj).removeAllListeners(opt_type);\r\n  }\r\n\r\n  var listenerMap = goog.events.getListenerMap_(\r\n      /** @type {!EventTarget} */ (obj));\r\n  if (!listenerMap) {\r\n    return 0;\r\n  }\r\n\r\n  var count = 0;\r\n  var typeStr = opt_type && opt_type.toString();\r\n  for (var type in listenerMap.listeners) {\r\n    if (!typeStr || type == typeStr) {\r\n      // Clone so that we don't need to worry about unlistenByKey\r\n      // changing the content of the ListenerMap.\r\n      var listeners = listenerMap.listeners[type].concat();\r\n      for (var i = 0; i < listeners.length; ++i) {\r\n        if (goog.events.unlistenByKey(listeners[i])) {\r\n          ++count;\r\n        }\r\n      }\r\n    }\r\n  }\r\n  return count;\r\n};\r\n\r\n\r\n/**\r\n * Gets the listeners for a given object, type and capture phase.\r\n *\r\n * @param {Object} obj Object to get listeners for.\r\n * @param {string|!goog.events.EventId} type Event type.\r\n * @param {boolean} capture Capture phase?.\r\n * @return {Array<!goog.events.Listener>} Array of listener objects.\r\n */\r\ngoog.events.getListeners = function(obj, type, capture) {\r\n  if (goog.events.Listenable.isImplementedBy(obj)) {\r\n    return /** @type {!goog.events.Listenable} */ (obj).getListeners(\r\n        type, capture);\r\n  } else {\r\n    if (!obj) {\r\n      // TODO(chrishenry): We should tighten the API to accept\r\n      // !EventTarget|goog.events.Listenable, and add an assertion here.\r\n      return [];\r\n    }\r\n\r\n    var listenerMap = goog.events.getListenerMap_(\r\n        /** @type {!EventTarget} */ (obj));\r\n    return listenerMap ? listenerMap.getListeners(type, capture) : [];\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Gets the goog.events.Listener for the event or null if no such listener is\r\n * in use.\r\n *\r\n * @param {EventTarget|goog.events.Listenable} src The target from\r\n *     which to get listeners.\r\n * @param {?string|!goog.events.EventId<EVENTOBJ>} type The type of the event.\r\n * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null} listener The\r\n *     listener function to get.\r\n * @param {boolean=} opt_capt In DOM-compliant browsers, this determines\r\n *                            whether the listener is fired during the\r\n *                            capture or bubble phase of the event.\r\n * @param {Object=} opt_handler Element in whose scope to call the listener.\r\n * @return {goog.events.ListenableKey} the found listener or null if not found.\r\n * @template EVENTOBJ\r\n */\r\ngoog.events.getListener = function(src, type, listener, opt_capt, opt_handler) {\r\n  // TODO(chrishenry): Change type from ?string to string, or add assertion.\r\n  type = /** @type {string} */ (type);\r\n  listener = goog.events.wrapListener(listener);\r\n  var capture = !!opt_capt;\r\n  if (goog.events.Listenable.isImplementedBy(src)) {\r\n    return src.getListener(type, listener, capture, opt_handler);\r\n  }\r\n\r\n  if (!src) {\r\n    // TODO(chrishenry): We should tighten the API to only accept\r\n    // non-null objects, or add an assertion here.\r\n    return null;\r\n  }\r\n\r\n  var listenerMap = goog.events.getListenerMap_(\r\n      /** @type {!EventTarget} */ (src));\r\n  if (listenerMap) {\r\n    return listenerMap.getListener(type, listener, capture, opt_handler);\r\n  }\r\n  return null;\r\n};\r\n\r\n\r\n/**\r\n * Returns whether an event target has any active listeners matching the\r\n * specified signature. If either the type or capture parameters are\r\n * unspecified, the function will match on the remaining criteria.\r\n *\r\n * @param {EventTarget|goog.events.Listenable} obj Target to get\r\n *     listeners for.\r\n * @param {string|!goog.events.EventId=} opt_type Event type.\r\n * @param {boolean=} opt_capture Whether to check for capture or bubble-phase\r\n *     listeners.\r\n * @return {boolean} Whether an event target has one or more listeners matching\r\n *     the requested type and/or capture phase.\r\n */\r\ngoog.events.hasListener = function(obj, opt_type, opt_capture) {\r\n  if (goog.events.Listenable.isImplementedBy(obj)) {\r\n    return obj.hasListener(opt_type, opt_capture);\r\n  }\r\n\r\n  var listenerMap = goog.events.getListenerMap_(\r\n      /** @type {!EventTarget} */ (obj));\r\n  return !!listenerMap && listenerMap.hasListener(opt_type, opt_capture);\r\n};\r\n\r\n\r\n/**\r\n * Provides a nice string showing the normalized event objects public members\r\n * @param {Object} e Event Object.\r\n * @return {string} String of the public members of the normalized event object.\r\n */\r\ngoog.events.expose = function(e) {\r\n  var str = [];\r\n  for (var key in e) {\r\n    if (e[key] && e[key].id) {\r\n      str.push(key + ' = ' + e[key] + ' (' + e[key].id + ')');\r\n    } else {\r\n      str.push(key + ' = ' + e[key]);\r\n    }\r\n  }\r\n  return str.join('\\n');\r\n};\r\n\r\n\r\n/**\r\n * Returns a string with on prepended to the specified type. This is used for IE\r\n * which expects \"on\" to be prepended. This function caches the string in order\r\n * to avoid extra allocations in steady state.\r\n * @param {string} type Event type.\r\n * @return {string} The type string with 'on' prepended.\r\n * @private\r\n */\r\ngoog.events.getOnString_ = function(type) {\r\n  if (type in goog.events.onStringMap_) {\r\n    return goog.events.onStringMap_[type];\r\n  }\r\n  return goog.events.onStringMap_[type] = goog.events.onString_ + type;\r\n};\r\n\r\n\r\n/**\r\n * Fires an object's listeners of a particular type and phase\r\n *\r\n * @param {Object} obj Object whose listeners to call.\r\n * @param {string|!goog.events.EventId} type Event type.\r\n * @param {boolean} capture Which event phase.\r\n * @param {Object} eventObject Event object to be passed to listener.\r\n * @return {boolean} True if all listeners returned true else false.\r\n */\r\ngoog.events.fireListeners = function(obj, type, capture, eventObject) {\r\n  if (goog.events.Listenable.isImplementedBy(obj)) {\r\n    return /** @type {!goog.events.Listenable} */ (obj).fireListeners(\r\n        type, capture, eventObject);\r\n  }\r\n\r\n  return goog.events.fireListeners_(obj, type, capture, eventObject);\r\n};\r\n\r\n\r\n/**\r\n * Fires an object's listeners of a particular type and phase.\r\n * @param {Object} obj Object whose listeners to call.\r\n * @param {string|!goog.events.EventId} type Event type.\r\n * @param {boolean} capture Which event phase.\r\n * @param {Object} eventObject Event object to be passed to listener.\r\n * @return {boolean} True if all listeners returned true else false.\r\n * @private\r\n */\r\ngoog.events.fireListeners_ = function(obj, type, capture, eventObject) {\r\n  /** @type {boolean} */\r\n  var retval = true;\r\n\r\n  var listenerMap = goog.events.getListenerMap_(\r\n      /** @type {EventTarget} */ (obj));\r\n  if (listenerMap) {\r\n    // TODO(chrishenry): Original code avoids array creation when there\r\n    // is no listener, so we do the same. If this optimization turns\r\n    // out to be not required, we can replace this with\r\n    // listenerMap.getListeners(type, capture) instead, which is simpler.\r\n    var listenerArray = listenerMap.listeners[type.toString()];\r\n    if (listenerArray) {\r\n      listenerArray = listenerArray.concat();\r\n      for (var i = 0; i < listenerArray.length; i++) {\r\n        var listener = listenerArray[i];\r\n        // We might not have a listener if the listener was removed.\r\n        if (listener && listener.capture == capture && !listener.removed) {\r\n          var result = goog.events.fireListener(listener, eventObject);\r\n          retval = retval && (result !== false);\r\n        }\r\n      }\r\n    }\r\n  }\r\n  return retval;\r\n};\r\n\r\n\r\n/**\r\n * Fires a listener with a set of arguments\r\n *\r\n * @param {goog.events.Listener} listener The listener object to call.\r\n * @param {Object} eventObject The event object to pass to the listener.\r\n * @return {*} Result of listener.\r\n */\r\ngoog.events.fireListener = function(listener, eventObject) {\r\n  var listenerFn = listener.listener;\r\n  var listenerHandler = listener.handler || listener.src;\r\n\r\n  if (listener.callOnce) {\r\n    goog.events.unlistenByKey(listener);\r\n  }\r\n  return listenerFn.call(listenerHandler, eventObject);\r\n};\r\n\r\n\r\n/**\r\n * Gets the total number of listeners currently in the system.\r\n * @return {number} Number of listeners.\r\n * @deprecated This returns estimated count, now that Closure no longer\r\n * stores a central listener registry. We still return an estimation\r\n * to keep existing listener-related tests passing. In the near future,\r\n * this function will be removed.\r\n */\r\ngoog.events.getTotalListenerCount = function() {\r\n  return goog.events.listenerCountEstimate_;\r\n};\r\n\r\n\r\n/**\r\n * Dispatches an event (or event like object) and calls all listeners\r\n * listening for events of this type. The type of the event is decided by the\r\n * type property on the event object.\r\n *\r\n * If any of the listeners returns false OR calls preventDefault then this\r\n * function will return false.  If one of the capture listeners calls\r\n * stopPropagation, then the bubble listeners won't fire.\r\n *\r\n * @param {goog.events.Listenable} src The event target.\r\n * @param {goog.events.EventLike} e Event object.\r\n * @return {boolean} If anyone called preventDefault on the event object (or\r\n *     if any of the handlers returns false) this will also return false.\r\n *     If there are no handlers, or if all handlers return true, this returns\r\n *     true.\r\n */\r\ngoog.events.dispatchEvent = function(src, e) {\r\n  goog.asserts.assert(\r\n      goog.events.Listenable.isImplementedBy(src),\r\n      'Can not use goog.events.dispatchEvent with ' +\r\n          'non-goog.events.Listenable instance.');\r\n  return src.dispatchEvent(e);\r\n};\r\n\r\n\r\n/**\r\n * Installs exception protection for the browser event entry point using the\r\n * given error handler.\r\n *\r\n * @param {goog.debug.ErrorHandler} errorHandler Error handler with which to\r\n *     protect the entry point.\r\n */\r\ngoog.events.protectBrowserEventEntryPoint = function(errorHandler) {\r\n  goog.events.handleBrowserEvent_ =\r\n      errorHandler.protectEntryPoint(goog.events.handleBrowserEvent_);\r\n};\r\n\r\n\r\n/**\r\n * Handles an event and dispatches it to the correct listeners. This\r\n * function is a proxy for the real listener the user specified.\r\n *\r\n * @param {goog.events.Listener} listener The listener object.\r\n * @param {Event=} opt_evt Optional event object that gets passed in via the\r\n *     native event handlers.\r\n * @return {*} Result of the event handler.\r\n * @this {EventTarget} The object or Element that fired the event.\r\n * @private\r\n */\r\ngoog.events.handleBrowserEvent_ = function(listener, opt_evt) {\r\n  if (listener.removed) {\r\n    return true;\r\n  }\r\n\r\n  // Synthesize event propagation if the browser does not support W3C\r\n  // event model.\r\n  if (!goog.events.BrowserFeature.HAS_W3C_EVENT_SUPPORT) {\r\n    var ieEvent = opt_evt ||\r\n        /** @type {Event} */ (goog.getObjectByName('window.event'));\r\n    var evt = new goog.events.BrowserEvent(ieEvent, this);\r\n    /** @type {*} */\r\n    var retval = true;\r\n\r\n    if (goog.events.CAPTURE_SIMULATION_MODE ==\r\n        goog.events.CaptureSimulationMode.ON) {\r\n      // If we have not marked this event yet, we should perform capture\r\n      // simulation.\r\n      if (!goog.events.isMarkedIeEvent_(ieEvent)) {\r\n        goog.events.markIeEvent_(ieEvent);\r\n\r\n        var ancestors = [];\r\n        for (var parent = evt.currentTarget; parent;\r\n             parent = parent.parentNode) {\r\n          ancestors.push(parent);\r\n        }\r\n\r\n        // Fire capture listeners.\r\n        var type = listener.type;\r\n        for (var i = ancestors.length - 1; !evt.propagationStopped_ && i >= 0;\r\n             i--) {\r\n          evt.currentTarget = ancestors[i];\r\n          var result =\r\n              goog.events.fireListeners_(ancestors[i], type, true, evt);\r\n          retval = retval && result;\r\n        }\r\n\r\n        // Fire bubble listeners.\r\n        //\r\n        // We can technically rely on IE to perform bubble event\r\n        // propagation. However, it turns out that IE fires events in\r\n        // opposite order of attachEvent registration, which broke\r\n        // some code and tests that rely on the order. (While W3C DOM\r\n        // Level 2 Events TR leaves the event ordering unspecified,\r\n        // modern browsers and W3C DOM Level 3 Events Working Draft\r\n        // actually specify the order as the registration order.)\r\n        for (var i = 0; !evt.propagationStopped_ && i < ancestors.length; i++) {\r\n          evt.currentTarget = ancestors[i];\r\n          var result =\r\n              goog.events.fireListeners_(ancestors[i], type, false, evt);\r\n          retval = retval && result;\r\n        }\r\n      }\r\n    } else {\r\n      retval = goog.events.fireListener(listener, evt);\r\n    }\r\n    return retval;\r\n  }\r\n\r\n  // Otherwise, simply fire the listener.\r\n  return goog.events.fireListener(\r\n      listener, new goog.events.BrowserEvent(opt_evt, this));\r\n};\r\n\r\n\r\n/**\r\n * This is used to mark the IE event object so we do not do the Closure pass\r\n * twice for a bubbling event.\r\n * @param {Event} e The IE browser event.\r\n * @private\r\n */\r\ngoog.events.markIeEvent_ = function(e) {\r\n  // Only the keyCode and the returnValue can be changed. We use keyCode for\r\n  // non keyboard events.\r\n  // event.returnValue is a bit more tricky. It is undefined by default. A\r\n  // boolean false prevents the default action. In a window.onbeforeunload and\r\n  // the returnValue is non undefined it will be alerted. However, we will only\r\n  // modify the returnValue for keyboard events. We can get a problem if non\r\n  // closure events sets the keyCode or the returnValue\r\n\r\n  var useReturnValue = false;\r\n\r\n  if (e.keyCode == 0) {\r\n    // We cannot change the keyCode in case that srcElement is input[type=file].\r\n    // We could test that that is the case but that would allocate 3 objects.\r\n    // If we use try/catch we will only allocate extra objects in the case of a\r\n    // failure.\r\n\r\n    try {\r\n      e.keyCode = -1;\r\n      return;\r\n    } catch (ex) {\r\n      useReturnValue = true;\r\n    }\r\n  }\r\n\r\n  if (useReturnValue ||\r\n      /** @type {boolean|undefined} */ (e.returnValue) == undefined) {\r\n    e.returnValue = true;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * This is used to check if an IE event has already been handled by the Closure\r\n * system so we do not do the Closure pass twice for a bubbling event.\r\n * @param {Event} e  The IE browser event.\r\n * @return {boolean} True if the event object has been marked.\r\n * @private\r\n */\r\ngoog.events.isMarkedIeEvent_ = function(e) {\r\n  return e.keyCode < 0 || e.returnValue != undefined;\r\n};\r\n\r\n\r\n/**\r\n * Counter to create unique event ids.\r\n * @private {number}\r\n */\r\ngoog.events.uniqueIdCounter_ = 0;\r\n\r\n\r\n/**\r\n * Creates a unique event id.\r\n *\r\n * @param {string} identifier The identifier.\r\n * @return {string} A unique identifier.\r\n * @idGenerator {unique}\r\n */\r\ngoog.events.getUniqueId = function(identifier) {\r\n  return identifier + '_' + goog.events.uniqueIdCounter_++;\r\n};\r\n\r\n\r\n/**\r\n * @param {EventTarget} src The source object.\r\n * @return {goog.events.ListenerMap} A listener map for the given\r\n *     source object, or null if none exists.\r\n * @private\r\n */\r\ngoog.events.getListenerMap_ = function(src) {\r\n  var listenerMap = src[goog.events.LISTENER_MAP_PROP_];\r\n  // IE serializes the property as well (e.g. when serializing outer\r\n  // HTML). So we must check that the value is of the correct type.\r\n  return listenerMap instanceof goog.events.ListenerMap ? listenerMap : null;\r\n};\r\n\r\n\r\n/**\r\n * Expando property for listener function wrapper for Object with\r\n * handleEvent.\r\n * @private @const {string}\r\n */\r\ngoog.events.LISTENER_WRAPPER_PROP_ =\r\n    '__closure_events_fn_' + ((Math.random() * 1e9) >>> 0);\r\n\r\n\r\n/**\r\n * @param {Object|Function} listener The listener function or an\r\n *     object that contains handleEvent method.\r\n * @return {!Function} Either the original function or a function that\r\n *     calls obj.handleEvent. If the same listener is passed to this\r\n *     function more than once, the same function is guaranteed to be\r\n *     returned.\r\n */\r\ngoog.events.wrapListener = function(listener) {\r\n  goog.asserts.assert(listener, 'Listener can not be null.');\r\n\r\n  if (goog.isFunction(listener)) {\r\n    return listener;\r\n  }\r\n\r\n  goog.asserts.assert(\r\n      listener.handleEvent, 'An object listener must have handleEvent method.');\r\n  if (!listener[goog.events.LISTENER_WRAPPER_PROP_]) {\r\n    listener[goog.events.LISTENER_WRAPPER_PROP_] = function(e) {\r\n      return /** @type {?} */ (listener).handleEvent(e);\r\n    };\r\n  }\r\n  return listener[goog.events.LISTENER_WRAPPER_PROP_];\r\n};\r\n\r\n\r\n// Register the browser event handler as an entry point, so that\r\n// it can be monitored for exception handling, etc.\r\ngoog.debug.entryPointRegistry.register(\r\n    /**\r\n     * @param {function(!Function): !Function} transformer The transforming\r\n     *     function.\r\n     */\r\n    function(transformer) {\r\n      goog.events.handleBrowserEvent_ =\r\n          transformer(goog.events.handleBrowserEvent_);\r\n    });\r\n","// Copyright 2005 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview A disposable implementation of a custom\r\n * listenable/event target. See also: documentation for\r\n * `goog.events.Listenable`.\r\n *\r\n * @author arv@google.com (Erik Arvidsson) [Original implementation]\r\n * @see ../demos/eventtarget.html\r\n * @see goog.events.Listenable\r\n */\r\n\r\ngoog.provide('goog.events.EventTarget');\r\n\r\ngoog.require('goog.Disposable');\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.events');\r\ngoog.require('goog.events.Event');\r\ngoog.require('goog.events.Listenable');\r\ngoog.require('goog.events.ListenerMap');\r\ngoog.require('goog.object');\r\n\r\n\r\n\r\n/**\r\n * An implementation of `goog.events.Listenable` with full W3C\r\n * EventTarget-like support (capture/bubble mechanism, stopping event\r\n * propagation, preventing default actions).\r\n *\r\n * You may subclass this class to turn your class into a Listenable.\r\n *\r\n * Unless propagation is stopped, an event dispatched by an\r\n * EventTarget will bubble to the parent returned by\r\n * `getParentEventTarget`. To set the parent, call\r\n * `setParentEventTarget`. Subclasses that don't support\r\n * changing the parent can override the setter to throw an error.\r\n *\r\n * Example usage:\r\n * <pre>\r\n *   var source = new goog.events.EventTarget();\r\n *   function handleEvent(e) {\r\n *     alert('Type: ' + e.type + '; Target: ' + e.target);\r\n *   }\r\n *   source.listen('foo', handleEvent);\r\n *   // Or: goog.events.listen(source, 'foo', handleEvent);\r\n *   ...\r\n *   source.dispatchEvent('foo');  // will call handleEvent\r\n *   ...\r\n *   source.unlisten('foo', handleEvent);\r\n *   // Or: goog.events.unlisten(source, 'foo', handleEvent);\r\n * </pre>\r\n *\r\n * @constructor\r\n * @extends {goog.Disposable}\r\n * @implements {goog.events.Listenable}\r\n */\r\ngoog.events.EventTarget = function() {\r\n  goog.Disposable.call(this);\r\n\r\n  /**\r\n   * Maps of event type to an array of listeners.\r\n   * @private {!goog.events.ListenerMap}\r\n   */\r\n  this.eventTargetListeners_ = new goog.events.ListenerMap(this);\r\n\r\n  /**\r\n   * The object to use for event.target. Useful when mixing in an\r\n   * EventTarget to another object.\r\n   * @private {!Object}\r\n   */\r\n  this.actualEventTarget_ = this;\r\n\r\n  /**\r\n   * Parent event target, used during event bubbling.\r\n   *\r\n   * TODO(chrishenry): Change this to goog.events.Listenable. This\r\n   * currently breaks people who expect getParentEventTarget to return\r\n   * goog.events.EventTarget.\r\n   *\r\n   * @private {?goog.events.EventTarget}\r\n   */\r\n  this.parentEventTarget_ = null;\r\n};\r\ngoog.inherits(goog.events.EventTarget, goog.Disposable);\r\ngoog.events.Listenable.addImplementation(goog.events.EventTarget);\r\n\r\n\r\n/**\r\n * An artificial cap on the number of ancestors you can have. This is mainly\r\n * for loop detection.\r\n * @const {number}\r\n * @private\r\n */\r\ngoog.events.EventTarget.MAX_ANCESTORS_ = 1000;\r\n\r\n\r\n/**\r\n * Returns the parent of this event target to use for bubbling.\r\n *\r\n * @return {goog.events.EventTarget} The parent EventTarget or null if\r\n *     there is no parent.\r\n * @override\r\n */\r\ngoog.events.EventTarget.prototype.getParentEventTarget = function() {\r\n  return this.parentEventTarget_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the parent of this event target to use for capture/bubble\r\n * mechanism.\r\n * @param {goog.events.EventTarget} parent Parent listenable (null if none).\r\n */\r\ngoog.events.EventTarget.prototype.setParentEventTarget = function(parent) {\r\n  this.parentEventTarget_ = parent;\r\n};\r\n\r\n\r\n/**\r\n * Adds an event listener to the event target. The same handler can only be\r\n * added once per the type. Even if you add the same handler multiple times\r\n * using the same type then it will only be called once when the event is\r\n * dispatched.\r\n *\r\n * @param {string|!goog.events.EventId} type The type of the event to listen for\r\n * @param {function(?):?|{handleEvent:function(?):?}|null} handler The function\r\n *     to handle the event. The handler can also be an object that implements\r\n *     the handleEvent method which takes the event object as argument.\r\n * @param {boolean=} opt_capture In DOM-compliant browsers, this determines\r\n *     whether the listener is fired during the capture or bubble phase\r\n *     of the event.\r\n * @param {Object=} opt_handlerScope Object in whose scope to call\r\n *     the listener.\r\n * @deprecated Use `#listen` instead, when possible. Otherwise, use\r\n *     `goog.events.listen` if you are passing Object\r\n *     (instead of Function) as handler.\r\n */\r\ngoog.events.EventTarget.prototype.addEventListener = function(\r\n    type, handler, opt_capture, opt_handlerScope) {\r\n  goog.events.listen(this, type, handler, opt_capture, opt_handlerScope);\r\n};\r\n\r\n\r\n/**\r\n * Removes an event listener from the event target. The handler must be the\r\n * same object as the one added. If the handler has not been added then\r\n * nothing is done.\r\n *\r\n * @param {string} type The type of the event to listen for.\r\n * @param {function(?):?|{handleEvent:function(?):?}|null} handler The function\r\n *     to handle the event. The handler can also be an object that implements\r\n *     the handleEvent method which takes the event object as argument.\r\n * @param {boolean=} opt_capture In DOM-compliant browsers, this determines\r\n *     whether the listener is fired during the capture or bubble phase\r\n *     of the event.\r\n * @param {Object=} opt_handlerScope Object in whose scope to call\r\n *     the listener.\r\n * @deprecated Use `#unlisten` instead, when possible. Otherwise, use\r\n *     `goog.events.unlisten` if you are passing Object\r\n *     (instead of Function) as handler.\r\n */\r\ngoog.events.EventTarget.prototype.removeEventListener = function(\r\n    type, handler, opt_capture, opt_handlerScope) {\r\n  goog.events.unlisten(this, type, handler, opt_capture, opt_handlerScope);\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.events.EventTarget.prototype.dispatchEvent = function(e) {\r\n  this.assertInitialized_();\r\n\r\n  var ancestorsTree, ancestor = this.getParentEventTarget();\r\n  if (ancestor) {\r\n    ancestorsTree = [];\r\n    var ancestorCount = 1;\r\n    for (; ancestor; ancestor = ancestor.getParentEventTarget()) {\r\n      ancestorsTree.push(ancestor);\r\n      goog.asserts.assert(\r\n          (++ancestorCount < goog.events.EventTarget.MAX_ANCESTORS_),\r\n          'infinite loop');\r\n    }\r\n  }\r\n\r\n  return goog.events.EventTarget.dispatchEventInternal_(\r\n      this.actualEventTarget_, e, ancestorsTree);\r\n};\r\n\r\n\r\n/**\r\n * Removes listeners from this object.  Classes that extend EventTarget may\r\n * need to override this method in order to remove references to DOM Elements\r\n * and additional listeners.\r\n * @override\r\n * @protected\r\n */\r\ngoog.events.EventTarget.prototype.disposeInternal = function() {\r\n  goog.events.EventTarget.superClass_.disposeInternal.call(this);\r\n\r\n  this.removeAllListeners();\r\n  this.parentEventTarget_ = null;\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.events.EventTarget.prototype.listen = function(\r\n    type, listener, opt_useCapture, opt_listenerScope) {\r\n  this.assertInitialized_();\r\n  return this.eventTargetListeners_.add(\r\n      String(type), listener, false /* callOnce */, opt_useCapture,\r\n      opt_listenerScope);\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.events.EventTarget.prototype.listenOnce = function(\r\n    type, listener, opt_useCapture, opt_listenerScope) {\r\n  return this.eventTargetListeners_.add(\r\n      String(type), listener, true /* callOnce */, opt_useCapture,\r\n      opt_listenerScope);\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.events.EventTarget.prototype.unlisten = function(\r\n    type, listener, opt_useCapture, opt_listenerScope) {\r\n  return this.eventTargetListeners_.remove(\r\n      String(type), listener, opt_useCapture, opt_listenerScope);\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.events.EventTarget.prototype.unlistenByKey = function(key) {\r\n  return this.eventTargetListeners_.removeByKey(key);\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.events.EventTarget.prototype.removeAllListeners = function(opt_type) {\r\n  // TODO(chrishenry): Previously, removeAllListeners can be called on\r\n  // uninitialized EventTarget, so we preserve that behavior. We\r\n  // should remove this when usages that rely on that fact are purged.\r\n  if (!this.eventTargetListeners_) {\r\n    return 0;\r\n  }\r\n  return this.eventTargetListeners_.removeAll(opt_type);\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.events.EventTarget.prototype.fireListeners = function(\r\n    type, capture, eventObject) {\r\n  // TODO(chrishenry): Original code avoids array creation when there\r\n  // is no listener, so we do the same. If this optimization turns\r\n  // out to be not required, we can replace this with\r\n  // getListeners(type, capture) instead, which is simpler.\r\n  var listenerArray = this.eventTargetListeners_.listeners[String(type)];\r\n  if (!listenerArray) {\r\n    return true;\r\n  }\r\n  listenerArray = listenerArray.concat();\r\n\r\n  var rv = true;\r\n  for (var i = 0; i < listenerArray.length; ++i) {\r\n    var listener = listenerArray[i];\r\n    // We might not have a listener if the listener was removed.\r\n    if (listener && !listener.removed && listener.capture == capture) {\r\n      var listenerFn = listener.listener;\r\n      var listenerHandler = listener.handler || listener.src;\r\n\r\n      if (listener.callOnce) {\r\n        this.unlistenByKey(listener);\r\n      }\r\n      rv = listenerFn.call(listenerHandler, eventObject) !== false && rv;\r\n    }\r\n  }\r\n\r\n  return rv && eventObject.returnValue_ != false;\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.events.EventTarget.prototype.getListeners = function(type, capture) {\r\n  return this.eventTargetListeners_.getListeners(String(type), capture);\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.events.EventTarget.prototype.getListener = function(\r\n    type, listener, capture, opt_listenerScope) {\r\n  return this.eventTargetListeners_.getListener(\r\n      String(type), listener, capture, opt_listenerScope);\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.events.EventTarget.prototype.hasListener = function(\r\n    opt_type, opt_capture) {\r\n  var id = goog.isDef(opt_type) ? String(opt_type) : undefined;\r\n  return this.eventTargetListeners_.hasListener(id, opt_capture);\r\n};\r\n\r\n\r\n/**\r\n * Sets the target to be used for `event.target` when firing\r\n * event. Mainly used for testing. For example, see\r\n * `goog.testing.events.mixinListenable`.\r\n * @param {!Object} target The target.\r\n */\r\ngoog.events.EventTarget.prototype.setTargetForTesting = function(target) {\r\n  this.actualEventTarget_ = target;\r\n};\r\n\r\n\r\n/**\r\n * Asserts that the event target instance is initialized properly.\r\n * @private\r\n */\r\ngoog.events.EventTarget.prototype.assertInitialized_ = function() {\r\n  goog.asserts.assert(\r\n      this.eventTargetListeners_,\r\n      'Event target is not initialized. Did you call the superclass ' +\r\n          '(goog.events.EventTarget) constructor?');\r\n};\r\n\r\n\r\n/**\r\n * Dispatches the given event on the ancestorsTree.\r\n *\r\n * @param {!Object} target The target to dispatch on.\r\n * @param {goog.events.Event|Object|string} e The event object.\r\n * @param {Array<goog.events.Listenable>=} opt_ancestorsTree The ancestors\r\n *     tree of the target, in reverse order from the closest ancestor\r\n *     to the root event target. May be null if the target has no ancestor.\r\n * @return {boolean} If anyone called preventDefault on the event object (or\r\n *     if any of the listeners returns false) this will also return false.\r\n * @private\r\n */\r\ngoog.events.EventTarget.dispatchEventInternal_ = function(\r\n    target, e, opt_ancestorsTree) {\r\n  /** @suppress {missingProperties} */\r\n  var type = e.type || /** @type {string} */ (e);\r\n\r\n  // If accepting a string or object, create a custom event object so that\r\n  // preventDefault and stopPropagation work with the event.\r\n  if (goog.isString(e)) {\r\n    e = new goog.events.Event(e, target);\r\n  } else if (!(e instanceof goog.events.Event)) {\r\n    var oldEvent = e;\r\n    e = new goog.events.Event(type, target);\r\n    goog.object.extend(e, oldEvent);\r\n  } else {\r\n    e.target = e.target || target;\r\n  }\r\n\r\n  var rv = true, currentTarget;\r\n\r\n  // Executes all capture listeners on the ancestors, if any.\r\n  if (opt_ancestorsTree) {\r\n    for (var i = opt_ancestorsTree.length - 1; !e.propagationStopped_ && i >= 0;\r\n         i--) {\r\n      currentTarget = e.currentTarget = opt_ancestorsTree[i];\r\n      rv = currentTarget.fireListeners(type, true, e) && rv;\r\n    }\r\n  }\r\n\r\n  // Executes capture and bubble listeners on the target.\r\n  if (!e.propagationStopped_) {\r\n    currentTarget = /** @type {?} */ (e.currentTarget = target);\r\n    rv = currentTarget.fireListeners(type, true, e) && rv;\r\n    if (!e.propagationStopped_) {\r\n      rv = currentTarget.fireListeners(type, false, e) && rv;\r\n    }\r\n  }\r\n\r\n  // Executes all bubble listeners on the ancestors, if any.\r\n  if (opt_ancestorsTree) {\r\n    for (i = 0; !e.propagationStopped_ && i < opt_ancestorsTree.length; i++) {\r\n      currentTarget = e.currentTarget = opt_ancestorsTree[i];\r\n      rv = currentTarget.fireListeners(type, false, e) && rv;\r\n    }\r\n  }\r\n\r\n  return rv;\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview JSON utility functions.\r\n * @author arv@google.com (Erik Arvidsson)\r\n */\r\n\r\n\r\ngoog.provide('goog.json');\r\ngoog.provide('goog.json.Replacer');\r\ngoog.provide('goog.json.Reviver');\r\ngoog.provide('goog.json.Serializer');\r\n\r\n\r\n/**\r\n * @define {boolean} If true, use the native JSON parsing API.\r\n * NOTE: The default `goog.json.parse` implementation is able to handle\r\n * invalid JSON. JSPB used to produce invalid JSON which is not the case\r\n * anymore so this is safe to enable for parsing JSPB. Using native JSON is\r\n * faster and safer than the default implementation using `eval`.\r\n */\r\ngoog.json.USE_NATIVE_JSON = goog.define('goog.json.USE_NATIVE_JSON', false);\r\n\r\n/**\r\n * @define {boolean} If true, try the native JSON parsing API first. If it\r\n * fails, log an error and use `eval` instead. This is useful when\r\n * transitioning to `goog.json.USE_NATIVE_JSON`. The error logger needs to\r\n * be set by `goog.json.setErrorLogger`. If it is not set then the error\r\n * is ignored.\r\n */\r\ngoog.json.TRY_NATIVE_JSON = goog.define('goog.json.TRY_NATIVE_JSON', false);\r\n\r\n\r\n/**\r\n * Tests if a string is an invalid JSON string. This only ensures that we are\r\n * not using any invalid characters\r\n * @param {string} s The string to test.\r\n * @return {boolean} True if the input is a valid JSON string.\r\n */\r\ngoog.json.isValid = function(s) {\r\n  // All empty whitespace is not valid.\r\n  if (/^\\s*$/.test(s)) {\r\n    return false;\r\n  }\r\n\r\n  // This is taken from http://www.json.org/json2.js which is released to the\r\n  // public domain.\r\n  // Changes: We dissallow \\u2028 Line separator and \\u2029 Paragraph separator\r\n  // inside strings.  We also treat \\u2028 and \\u2029 as whitespace which they\r\n  // are in the RFC but IE and Safari does not match \\s to these so we need to\r\n  // include them in the reg exps in all places where whitespace is allowed.\r\n  // We allowed \\x7f inside strings because some tools don't escape it,\r\n  // e.g. http://www.json.org/java/org/json/JSONObject.java\r\n\r\n  // Parsing happens in three stages. In the first stage, we run the text\r\n  // against regular expressions that look for non-JSON patterns. We are\r\n  // especially concerned with '()' and 'new' because they can cause invocation,\r\n  // and '=' because it can cause mutation. But just to be safe, we want to\r\n  // reject all unexpected forms.\r\n\r\n  // We split the first stage into 4 regexp operations in order to work around\r\n  // crippling inefficiencies in IE's and Safari's regexp engines. First we\r\n  // replace all backslash pairs with '@' (a non-JSON character). Second, we\r\n  // replace all simple value tokens with ']' characters, but only when followed\r\n  // by a colon, comma, closing bracket or end of string. Third, we delete all\r\n  // open brackets that follow a colon or comma or that begin the text. Finally,\r\n  // we look to see that the remaining characters are only whitespace or ']' or\r\n  // ',' or ':' or '{' or '}'. If that is so, then the text is safe for eval.\r\n\r\n  // Don't make these static since they have the global flag.\r\n  var backslashesRe = /\\\\[\"\\\\\\/bfnrtu]/g;\r\n  var simpleValuesRe =\r\n      /(?:\"[^\"\\\\\\n\\r\\u2028\\u2029\\x00-\\x08\\x0a-\\x1f]*\"|true|false|null|-?\\d+(?:\\.\\d*)?(?:[eE][+\\-]?\\d+)?)[\\s\\u2028\\u2029]*(?=:|,|]|}|$)/g;\r\n  var openBracketsRe = /(?:^|:|,)(?:[\\s\\u2028\\u2029]*\\[)+/g;\r\n  var remainderRe = /^[\\],:{}\\s\\u2028\\u2029]*$/;\r\n\r\n  return remainderRe.test(\r\n      s.replace(backslashesRe, '@')\r\n          .replace(simpleValuesRe, ']')\r\n          .replace(openBracketsRe, ''));\r\n};\r\n\r\n/**\r\n * Logs a parsing error in `JSON.parse` solvable by using `eval`\r\n * if `goog.json.TRY_NATIVE_JSON` is enabled.\r\n * @private {function(string, !Error)} The first parameter is the error message,\r\n *     the second is the exception thrown by `JSON.parse`.\r\n */\r\ngoog.json.errorLogger_ = goog.nullFunction;\r\n\r\n\r\n/**\r\n * Sets an error logger to use if there's a recoverable parsing error and\r\n * `goog.json.TRY_NATIVE_JSON` is enabled.\r\n * @param {function(string, !Error)} errorLogger The first parameter is the\r\n *     error message, the second is the exception thrown by `JSON.parse`.\r\n */\r\ngoog.json.setErrorLogger = function(errorLogger) {\r\n  goog.json.errorLogger_ = errorLogger;\r\n};\r\n\r\n\r\n/**\r\n * Parses a JSON string and returns the result. This throws an exception if\r\n * the string is an invalid JSON string.\r\n *\r\n * Note that this is very slow on large strings. Use JSON.parse if possible.\r\n *\r\n * @param {*} s The JSON string to parse.\r\n * @throws Error if s is invalid JSON.\r\n * @return {Object} The object generated from the JSON string, or null.\r\n * @deprecated Use JSON.parse.\r\n */\r\ngoog.json.parse = goog.json.USE_NATIVE_JSON ?\r\n    /** @type {function(*):Object} */ (goog.global['JSON']['parse']) :\r\n    function(s) {\r\n      var error;\r\n      if (goog.json.TRY_NATIVE_JSON) {\r\n        try {\r\n          return goog.global['JSON']['parse'](s);\r\n        } catch (ex) {\r\n          error = ex;\r\n        }\r\n      }\r\n      var o = String(s);\r\n      if (goog.json.isValid(o)) {\r\n\r\n        try {\r\n          var result = /** @type {?Object} */ (eval('(' + o + ')'));\r\n          if (error) {\r\n            goog.json.errorLogger_('Invalid JSON: ' + o, error);\r\n          }\r\n          return result;\r\n        } catch (ex) {\r\n        }\r\n      }\r\n      throw new Error('Invalid JSON string: ' + o);\r\n    };\r\n\r\n\r\n/**\r\n * JSON replacer, as defined in Section 15.12.3 of the ES5 spec.\r\n * @see http://ecma-international.org/ecma-262/5.1/#sec-15.12.3\r\n *\r\n * TODO(nicksantos): Array should also be a valid replacer.\r\n *\r\n * @typedef {function(this:Object, string, *): *}\r\n */\r\ngoog.json.Replacer;\r\n\r\n\r\n/**\r\n * JSON reviver, as defined in Section 15.12.2 of the ES5 spec.\r\n * @see http://ecma-international.org/ecma-262/5.1/#sec-15.12.3\r\n *\r\n * @typedef {function(this:Object, string, *): *}\r\n */\r\ngoog.json.Reviver;\r\n\r\n\r\n/**\r\n * Serializes an object or a value to a JSON string.\r\n *\r\n * @param {*} object The object to serialize.\r\n * @param {?goog.json.Replacer=} opt_replacer A replacer function\r\n *     called for each (key, value) pair that determines how the value\r\n *     should be serialized. By defult, this just returns the value\r\n *     and allows default serialization to kick in.\r\n * @throws Error if there are loops in the object graph.\r\n * @return {string} A JSON string representation of the input.\r\n */\r\ngoog.json.serialize = goog.json.USE_NATIVE_JSON ?\r\n    /** @type {function(*, ?goog.json.Replacer=):string} */\r\n    (goog.global['JSON']['stringify']) :\r\n    function(object, opt_replacer) {\r\n      // NOTE(nicksantos): Currently, we never use JSON.stringify.\r\n      //\r\n      // The last time I evaluated this, JSON.stringify had subtle bugs and\r\n      // behavior differences on all browsers, and the performance win was not\r\n      // large enough to justify all the issues. This may change in the future\r\n      // as browser implementations get better.\r\n      //\r\n      // assertSerialize in json_test contains if branches for the cases\r\n      // that fail.\r\n      return new goog.json.Serializer(opt_replacer).serialize(object);\r\n    };\r\n\r\n\r\n\r\n/**\r\n * Class that is used to serialize JSON objects to a string.\r\n * @param {?goog.json.Replacer=} opt_replacer Replacer.\r\n * @constructor\r\n */\r\ngoog.json.Serializer = function(opt_replacer) {\r\n  /**\r\n   * @type {goog.json.Replacer|null|undefined}\r\n   * @private\r\n   */\r\n  this.replacer_ = opt_replacer;\r\n};\r\n\r\n\r\n/**\r\n * Serializes an object or a value to a JSON string.\r\n *\r\n * @param {*} object The object to serialize.\r\n * @throws Error if there are loops in the object graph.\r\n * @return {string} A JSON string representation of the input.\r\n */\r\ngoog.json.Serializer.prototype.serialize = function(object) {\r\n  var sb = [];\r\n  this.serializeInternal(object, sb);\r\n  return sb.join('');\r\n};\r\n\r\n\r\n/**\r\n * Serializes a generic value to a JSON string\r\n * @protected\r\n * @param {*} object The object to serialize.\r\n * @param {Array<string>} sb Array used as a string builder.\r\n * @throws Error if there are loops in the object graph.\r\n */\r\ngoog.json.Serializer.prototype.serializeInternal = function(object, sb) {\r\n  if (object == null) {\r\n    // undefined == null so this branch covers undefined as well as null\r\n    sb.push('null');\r\n    return;\r\n  }\r\n\r\n  if (typeof object == 'object') {\r\n    if (goog.isArray(object)) {\r\n      this.serializeArray(object, sb);\r\n      return;\r\n    } else if (\r\n        object instanceof String || object instanceof Number ||\r\n        object instanceof Boolean) {\r\n      object = object.valueOf();\r\n      // Fall through to switch below.\r\n    } else {\r\n      this.serializeObject_(/** @type {!Object} */ (object), sb);\r\n      return;\r\n    }\r\n  }\r\n\r\n  switch (typeof object) {\r\n    case 'string':\r\n      this.serializeString_(object, sb);\r\n      break;\r\n    case 'number':\r\n      this.serializeNumber_(object, sb);\r\n      break;\r\n    case 'boolean':\r\n      sb.push(String(object));\r\n      break;\r\n    case 'function':\r\n      sb.push('null');\r\n      break;\r\n    default:\r\n      throw new Error('Unknown type: ' + typeof object);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Character mappings used internally for goog.string.quote\r\n * @private\r\n * @type {!Object}\r\n */\r\ngoog.json.Serializer.charToJsonCharCache_ = {\r\n  '\\\"': '\\\\\"',\r\n  '\\\\': '\\\\\\\\',\r\n  '/': '\\\\/',\r\n  '\\b': '\\\\b',\r\n  '\\f': '\\\\f',\r\n  '\\n': '\\\\n',\r\n  '\\r': '\\\\r',\r\n  '\\t': '\\\\t',\r\n\r\n  '\\x0B': '\\\\u000b'  // '\\v' is not supported in JScript\r\n};\r\n\r\n\r\n/**\r\n * Regular expression used to match characters that need to be replaced.\r\n * The S60 browser has a bug where unicode characters are not matched by\r\n * regular expressions. The condition below detects such behaviour and\r\n * adjusts the regular expression accordingly.\r\n * @private\r\n * @type {!RegExp}\r\n */\r\ngoog.json.Serializer.charsToReplace_ = /\\uffff/.test('\\uffff') ?\r\n    /[\\\\\\\"\\x00-\\x1f\\x7f-\\uffff]/g :\r\n    /[\\\\\\\"\\x00-\\x1f\\x7f-\\xff]/g;\r\n\r\n\r\n/**\r\n * Serializes a string to a JSON string\r\n * @private\r\n * @param {string} s The string to serialize.\r\n * @param {Array<string>} sb Array used as a string builder.\r\n */\r\ngoog.json.Serializer.prototype.serializeString_ = function(s, sb) {\r\n  // The official JSON implementation does not work with international\r\n  // characters.\r\n  sb.push('\"', s.replace(goog.json.Serializer.charsToReplace_, function(c) {\r\n    // caching the result improves performance by a factor 2-3\r\n    var rv = goog.json.Serializer.charToJsonCharCache_[c];\r\n    if (!rv) {\r\n      rv = '\\\\u' + (c.charCodeAt(0) | 0x10000).toString(16).substr(1);\r\n      goog.json.Serializer.charToJsonCharCache_[c] = rv;\r\n    }\r\n    return rv;\r\n  }), '\"');\r\n};\r\n\r\n\r\n/**\r\n * Serializes a number to a JSON string\r\n * @private\r\n * @param {number} n The number to serialize.\r\n * @param {Array<string>} sb Array used as a string builder.\r\n */\r\ngoog.json.Serializer.prototype.serializeNumber_ = function(n, sb) {\r\n  sb.push(isFinite(n) && !isNaN(n) ? String(n) : 'null');\r\n};\r\n\r\n\r\n/**\r\n * Serializes an array to a JSON string\r\n * @param {Array<string>} arr The array to serialize.\r\n * @param {Array<string>} sb Array used as a string builder.\r\n * @protected\r\n */\r\ngoog.json.Serializer.prototype.serializeArray = function(arr, sb) {\r\n  var l = arr.length;\r\n  sb.push('[');\r\n  var sep = '';\r\n  for (var i = 0; i < l; i++) {\r\n    sb.push(sep);\r\n\r\n    var value = arr[i];\r\n    this.serializeInternal(\r\n        this.replacer_ ? this.replacer_.call(arr, String(i), value) : value,\r\n        sb);\r\n\r\n    sep = ',';\r\n  }\r\n  sb.push(']');\r\n};\r\n\r\n\r\n/**\r\n * Serializes an object to a JSON string\r\n * @private\r\n * @param {!Object} obj The object to serialize.\r\n * @param {Array<string>} sb Array used as a string builder.\r\n */\r\ngoog.json.Serializer.prototype.serializeObject_ = function(obj, sb) {\r\n  sb.push('{');\r\n  var sep = '';\r\n  for (var key in obj) {\r\n    if (Object.prototype.hasOwnProperty.call(obj, key)) {\r\n      var value = obj[key];\r\n      // Skip functions.\r\n      if (typeof value != 'function') {\r\n        sb.push(sep);\r\n        this.serializeString_(key, sb);\r\n        sb.push(':');\r\n\r\n        this.serializeInternal(\r\n            this.replacer_ ? this.replacer_.call(obj, key, value) : value, sb);\r\n\r\n        sep = ',';\r\n      }\r\n    }\r\n  }\r\n  sb.push('}');\r\n};\r\n","// Copyright 2015 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Simple freelist.\r\n *\r\n * An anterative to goog.structs.SimplePool, it imposes the requirement that the\r\n * objects in the list contain a \"next\" property that can be used to maintain\r\n * the pool.\r\n */\r\n\r\ngoog.provide('goog.async.FreeList');\r\n\r\n\r\n/**\r\n * @template ITEM\r\n */\r\ngoog.async.FreeList = goog.defineClass(null, {\r\n  /**\r\n   * @param {function():ITEM} create\r\n   * @param {function(ITEM):void} reset\r\n   * @param {number} limit\r\n   */\r\n  constructor: function(create, reset, limit) {\r\n    /** @private @const {number} */\r\n    this.limit_ = limit;\r\n    /** @private @const {function()} */\r\n    this.create_ = create;\r\n    /** @private @const {function(ITEM):void} */\r\n    this.reset_ = reset;\r\n\r\n    /** @private {number} */\r\n    this.occupants_ = 0;\r\n    /** @private {ITEM} */\r\n    this.head_ = null;\r\n  },\r\n\r\n  /**\r\n   * @return {ITEM}\r\n   */\r\n  get: function() {\r\n    var item;\r\n    if (this.occupants_ > 0) {\r\n      this.occupants_--;\r\n      item = this.head_;\r\n      this.head_ = item.next;\r\n      item.next = null;\r\n    } else {\r\n      item = this.create_();\r\n    }\r\n    return item;\r\n  },\r\n\r\n  /**\r\n   * @param {ITEM} item An item available for possible future reuse.\r\n   */\r\n  put: function(item) {\r\n    this.reset_(item);\r\n    if (this.occupants_ < this.limit_) {\r\n      this.occupants_++;\r\n      item.next = this.head_;\r\n      this.head_ = item;\r\n    }\r\n  },\r\n\r\n  /**\r\n   * Visible for testing.\r\n   * @package\r\n   * @return {number}\r\n   */\r\n  occupants: function() { return this.occupants_; }\r\n});\r\n","// Copyright 2015 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\ngoog.provide('goog.async.WorkItem');\r\ngoog.provide('goog.async.WorkQueue');\r\n\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.async.FreeList');\r\n\r\n\r\n// TODO(johnlenz): generalize the WorkQueue if this is used by more\r\n// than goog.async.run.\r\n\r\n\r\n\r\n/**\r\n * A low GC workqueue. The key elements of this design:\r\n *   - avoids the need for goog.bind or equivalent by carrying scope\r\n *   - avoids the need for array reallocation by using a linked list\r\n *   - minimizes work entry objects allocation by recycling objects\r\n * @constructor\r\n * @final\r\n * @struct\r\n */\r\ngoog.async.WorkQueue = function() {\r\n  this.workHead_ = null;\r\n  this.workTail_ = null;\r\n};\r\n\r\n\r\n/** @define {number} The maximum number of entries to keep for recycling. */\r\ngoog.async.WorkQueue.DEFAULT_MAX_UNUSED =\r\n    goog.define('goog.async.WorkQueue.DEFAULT_MAX_UNUSED', 100);\r\n\r\n\r\n/** @const @private {goog.async.FreeList<goog.async.WorkItem>} */\r\ngoog.async.WorkQueue.freelist_ = new goog.async.FreeList(\r\n    function() { return new goog.async.WorkItem(); },\r\n    function(item) { item.reset(); }, goog.async.WorkQueue.DEFAULT_MAX_UNUSED);\r\n\r\n\r\n/**\r\n * @param {function()} fn\r\n * @param {Object|null|undefined} scope\r\n */\r\ngoog.async.WorkQueue.prototype.add = function(fn, scope) {\r\n  var item = this.getUnusedItem_();\r\n  item.set(fn, scope);\r\n\r\n  if (this.workTail_) {\r\n    this.workTail_.next = item;\r\n    this.workTail_ = item;\r\n  } else {\r\n    goog.asserts.assert(!this.workHead_);\r\n    this.workHead_ = item;\r\n    this.workTail_ = item;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {goog.async.WorkItem}\r\n */\r\ngoog.async.WorkQueue.prototype.remove = function() {\r\n  var item = null;\r\n\r\n  if (this.workHead_) {\r\n    item = this.workHead_;\r\n    this.workHead_ = this.workHead_.next;\r\n    if (!this.workHead_) {\r\n      this.workTail_ = null;\r\n    }\r\n    item.next = null;\r\n  }\r\n  return item;\r\n};\r\n\r\n\r\n/**\r\n * @param {goog.async.WorkItem} item\r\n */\r\ngoog.async.WorkQueue.prototype.returnUnused = function(item) {\r\n  goog.async.WorkQueue.freelist_.put(item);\r\n};\r\n\r\n\r\n/**\r\n * @return {goog.async.WorkItem}\r\n * @private\r\n */\r\ngoog.async.WorkQueue.prototype.getUnusedItem_ = function() {\r\n  return goog.async.WorkQueue.freelist_.get();\r\n};\r\n\r\n\r\n\r\n/**\r\n * @constructor\r\n * @final\r\n * @struct\r\n */\r\ngoog.async.WorkItem = function() {\r\n  /** @type {?function()} */\r\n  this.fn = null;\r\n  /** @type {?Object|null|undefined} */\r\n  this.scope = null;\r\n  /** @type {?goog.async.WorkItem} */\r\n  this.next = null;\r\n};\r\n\r\n\r\n/**\r\n * @param {function()} fn\r\n * @param {Object|null|undefined} scope\r\n */\r\ngoog.async.WorkItem.prototype.set = function(fn, scope) {\r\n  this.fn = fn;\r\n  this.scope = scope;\r\n  this.next = null;\r\n};\r\n\r\n\r\n/** Reset the work item so they don't prevent GC before reuse */\r\ngoog.async.WorkItem.prototype.reset = function() {\r\n  this.fn = null;\r\n  this.scope = null;\r\n  this.next = null;\r\n};\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\ngoog.provide('goog.async.run');\r\n\r\ngoog.require('goog.async.WorkQueue');\r\ngoog.require('goog.async.nextTick');\r\ngoog.require('goog.async.throwException');\r\n\r\n/**\r\n * @define {boolean} If true, use the global Promise to implement goog.async.run\r\n * assuming either the native, or polyfill version will be used. Does still\r\n * permit tests to use forceNextTick.\r\n */\r\ngoog.ASSUME_NATIVE_PROMISE = goog.define('goog.ASSUME_NATIVE_PROMISE', false);\r\n\r\n/**\r\n * Fires the provided callback just before the current callstack unwinds, or as\r\n * soon as possible after the current JS execution context.\r\n * @param {function(this:THIS)} callback\r\n * @param {THIS=} opt_context Object to use as the \"this value\" when calling\r\n *     the provided function.\r\n * @template THIS\r\n */\r\ngoog.async.run = function(callback, opt_context) {\r\n  if (!goog.async.run.schedule_) {\r\n    goog.async.run.initializeRunner_();\r\n  }\r\n  if (!goog.async.run.workQueueScheduled_) {\r\n    // Nothing is currently scheduled, schedule it now.\r\n    goog.async.run.schedule_();\r\n    goog.async.run.workQueueScheduled_ = true;\r\n  }\r\n\r\n  goog.async.run.workQueue_.add(callback, opt_context);\r\n};\r\n\r\n\r\n/**\r\n * Initializes the function to use to process the work queue.\r\n * @private\r\n */\r\ngoog.async.run.initializeRunner_ = function() {\r\n  if (goog.ASSUME_NATIVE_PROMISE ||\r\n      (goog.global.Promise && goog.global.Promise.resolve)) {\r\n    // Use goog.global.Promise instead of just Promise because the relevant\r\n    // externs may be missing, and don't alias it because this could confuse the\r\n    // compiler into thinking the polyfill is required when it should be treated\r\n    // as optional.\r\n    var promise = goog.global.Promise.resolve(undefined);\r\n    goog.async.run.schedule_ = function() {\r\n      promise.then(goog.async.run.processWorkQueue);\r\n    };\r\n  } else {\r\n    goog.async.run.schedule_ = function() {\r\n      goog.async.nextTick(goog.async.run.processWorkQueue);\r\n    };\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Forces goog.async.run to use nextTick instead of Promise.\r\n *\r\n * This should only be done in unit tests. It's useful because MockClock\r\n * replaces nextTick, but not the browser Promise implementation, so it allows\r\n * Promise-based code to be tested with MockClock.\r\n *\r\n * However, we also want to run promises if the MockClock is no longer in\r\n * control so we schedule a backup \"setTimeout\" to the unmocked timeout if\r\n * provided.\r\n *\r\n * @param {function(function())=} opt_realSetTimeout\r\n */\r\ngoog.async.run.forceNextTick = function(opt_realSetTimeout) {\r\n  goog.async.run.schedule_ = function() {\r\n    goog.async.nextTick(goog.async.run.processWorkQueue);\r\n    if (opt_realSetTimeout) {\r\n      opt_realSetTimeout(goog.async.run.processWorkQueue);\r\n    }\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * The function used to schedule work asynchronousely.\r\n * @private {function()}\r\n */\r\ngoog.async.run.schedule_;\r\n\r\n\r\n/** @private {boolean} */\r\ngoog.async.run.workQueueScheduled_ = false;\r\n\r\n\r\n/** @private {!goog.async.WorkQueue} */\r\ngoog.async.run.workQueue_ = new goog.async.WorkQueue();\r\n\r\n\r\nif (goog.DEBUG) {\r\n  /**\r\n   * Reset the work queue. Only available for tests in debug mode.\r\n   */\r\n  goog.async.run.resetQueue = function() {\r\n    goog.async.run.workQueueScheduled_ = false;\r\n    goog.async.run.workQueue_ = new goog.async.WorkQueue();\r\n  };\r\n}\r\n\r\n\r\n/**\r\n * Run any pending goog.async.run work items. This function is not intended\r\n * for general use, but for use by entry point handlers to run items ahead of\r\n * goog.async.nextTick.\r\n */\r\ngoog.async.run.processWorkQueue = function() {\r\n  // NOTE: additional work queue items may be added while processing.\r\n  var item = null;\r\n  while (item = goog.async.run.workQueue_.remove()) {\r\n    try {\r\n      item.fn.call(item.scope);\r\n    } catch (e) {\r\n      goog.async.throwException(e);\r\n    }\r\n    goog.async.run.workQueue_.returnUnused(item);\r\n  }\r\n\r\n  // There are no more work items, allow processing to be scheduled again.\r\n  goog.async.run.workQueueScheduled_ = false;\r\n};\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Provides a function to schedule running a function as soon\r\n * as possible after the current JS execution stops and yields to the event\r\n * loop.\r\n *\r\n */\r\n\r\ngoog.provide('goog.async.nextTick');\r\ngoog.provide('goog.async.throwException');\r\n\r\ngoog.require('goog.debug.entryPointRegistry');\r\ngoog.require('goog.dom.TagName');\r\ngoog.require('goog.functions');\r\ngoog.require('goog.labs.userAgent.browser');\r\ngoog.require('goog.labs.userAgent.engine');\r\n\r\n\r\n/**\r\n * Throw an item without interrupting the current execution context.  For\r\n * example, if processing a group of items in a loop, sometimes it is useful\r\n * to report an error while still allowing the rest of the batch to be\r\n * processed.\r\n * @param {*} exception\r\n */\r\ngoog.async.throwException = function(exception) {\r\n  // Each throw needs to be in its own context.\r\n  goog.global.setTimeout(function() { throw exception; }, 0);\r\n};\r\n\r\n\r\n/**\r\n * Fires the provided callbacks as soon as possible after the current JS\r\n * execution context. setTimeout(…, 0) takes at least 4ms when called from\r\n * within another setTimeout(…, 0) for legacy reasons.\r\n *\r\n * This will not schedule the callback as a microtask (i.e. a task that can\r\n * preempt user input or networking callbacks). It is meant to emulate what\r\n * setTimeout(_, 0) would do if it were not throttled. If you desire microtask\r\n * behavior, use {@see goog.Promise} instead.\r\n *\r\n * @param {function(this:SCOPE)} callback Callback function to fire as soon as\r\n *     possible.\r\n * @param {SCOPE=} opt_context Object in whose scope to call the listener.\r\n * @param {boolean=} opt_useSetImmediate Avoid the IE workaround that\r\n *     ensures correctness at the cost of speed. See comments for details.\r\n * @template SCOPE\r\n */\r\ngoog.async.nextTick = function(callback, opt_context, opt_useSetImmediate) {\r\n  var cb = callback;\r\n  if (opt_context) {\r\n    cb = goog.bind(callback, opt_context);\r\n  }\r\n  cb = goog.async.nextTick.wrapCallback_(cb);\r\n  // Note we do allow callers to also request setImmediate if they are willing\r\n  // to accept the possible tradeoffs of incorrectness in exchange for speed.\r\n  // The IE fallback of readystate change is much slower. See useSetImmediate_\r\n  // for details.\r\n  if (goog.isFunction(goog.global.setImmediate) &&\r\n      (opt_useSetImmediate || goog.async.nextTick.useSetImmediate_())) {\r\n    goog.global.setImmediate(cb);\r\n    return;\r\n  }\r\n\r\n  // Look for and cache the custom fallback version of setImmediate.\r\n  if (!goog.async.nextTick.setImmediate_) {\r\n    goog.async.nextTick.setImmediate_ =\r\n        goog.async.nextTick.getSetImmediateEmulator_();\r\n  }\r\n  goog.async.nextTick.setImmediate_(cb);\r\n};\r\n\r\n\r\n/**\r\n * Returns whether should use setImmediate implementation currently on window.\r\n *\r\n * window.setImmediate was introduced and currently only supported by IE10+,\r\n * but due to a bug in the implementation it is not guaranteed that\r\n * setImmediate is faster than setTimeout nor that setImmediate N is before\r\n * setImmediate N+1. That is why we do not use the native version if\r\n * available. We do, however, call setImmediate if it is a non-native function\r\n * because that indicates that it has been replaced by goog.testing.MockClock\r\n * which we do want to support.\r\n * See\r\n * http://connect.microsoft.com/IE/feedback/details/801823/setimmediate-and-messagechannel-are-broken-in-ie10\r\n *\r\n * @return {boolean} Whether to use the implementation of setImmediate defined\r\n *     on Window.\r\n * @private\r\n * @suppress {missingProperties} For \"Window.prototype.setImmediate\"\r\n */\r\ngoog.async.nextTick.useSetImmediate_ = function() {\r\n  // Not a browser environment.\r\n  if (!goog.global.Window || !goog.global.Window.prototype) {\r\n    return true;\r\n  }\r\n\r\n  // MS Edge has window.setImmediate natively, but it's not on Window.prototype.\r\n  // Also, there's no clean way to detect if the goog.global.setImmediate has\r\n  // been replaced by mockClock as its replacement also shows up as \"[native\r\n  // code]\" when using toString. Therefore, just always use\r\n  // goog.global.setImmediate for Edge. It's unclear if it suffers the same\r\n  // issues as IE10/11, but based on\r\n  // https://dev.modern.ie/testdrive/demos/setimmediatesorting/\r\n  // it seems they've been working to ensure it's WAI.\r\n  if (goog.labs.userAgent.browser.isEdge() ||\r\n      goog.global.Window.prototype.setImmediate != goog.global.setImmediate) {\r\n    // Something redefined setImmediate in which case we decide to use it (This\r\n    // is so that we use the mockClock setImmediate).\r\n    return true;\r\n  }\r\n\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Cache for the setImmediate implementation.\r\n * @type {function(function())}\r\n * @private\r\n */\r\ngoog.async.nextTick.setImmediate_;\r\n\r\n\r\n/**\r\n * Determines the best possible implementation to run a function as soon as\r\n * the JS event loop is idle.\r\n * @return {function(function())} The \"setImmediate\" implementation.\r\n * @private\r\n */\r\ngoog.async.nextTick.getSetImmediateEmulator_ = function() {\r\n  // Create a private message channel and use it to postMessage empty messages\r\n  // to ourselves.\r\n  /** @type {!Function|undefined} */\r\n  var Channel = goog.global['MessageChannel'];\r\n  // If MessageChannel is not available and we are in a browser, implement\r\n  // an iframe based polyfill in browsers that have postMessage and\r\n  // document.addEventListener. The latter excludes IE8 because it has a\r\n  // synchronous postMessage implementation.\r\n  if (typeof Channel === 'undefined' && typeof window !== 'undefined' &&\r\n      window.postMessage && window.addEventListener &&\r\n      // Presto (The old pre-blink Opera engine) has problems with iframes\r\n      // and contentWindow.\r\n      !goog.labs.userAgent.engine.isPresto()) {\r\n    /** @constructor */\r\n    Channel = function() {\r\n      // Make an empty, invisible iframe.\r\n      var iframe = /** @type {!HTMLIFrameElement} */ (\r\n          document.createElement(String(goog.dom.TagName.IFRAME)));\r\n      iframe.style.display = 'none';\r\n      iframe.src = '';\r\n      document.documentElement.appendChild(iframe);\r\n      var win = iframe.contentWindow;\r\n      var doc = win.document;\r\n      doc.open();\r\n      doc.write('');\r\n      doc.close();\r\n      // Do not post anything sensitive over this channel, as the workaround for\r\n      // pages with file: origin could allow that information to be modified or\r\n      // intercepted.\r\n      var message = 'callImmediate' + Math.random();\r\n      // The same origin policy rejects attempts to postMessage from file: urls\r\n      // unless the origin is '*'.\r\n      var origin = win.location.protocol == 'file:' ?\r\n          '*' :\r\n          win.location.protocol + '//' + win.location.host;\r\n      var onmessage = goog.bind(function(e) {\r\n        // Validate origin and message to make sure that this message was\r\n        // intended for us. If the origin is set to '*' (see above) only the\r\n        // message needs to match since, for example, '*' != 'file://'. Allowing\r\n        // the wildcard is ok, as we are not concerned with security here.\r\n        if ((origin != '*' && e.origin != origin) || e.data != message) {\r\n          return;\r\n        }\r\n        this['port1'].onmessage();\r\n      }, this);\r\n      win.addEventListener('message', onmessage, false);\r\n      this['port1'] = {};\r\n      this['port2'] = {\r\n        postMessage: function() { win.postMessage(message, origin); }\r\n      };\r\n    };\r\n  }\r\n  if (typeof Channel !== 'undefined' && !goog.labs.userAgent.browser.isIE()) {\r\n    // Exclude all of IE due to\r\n    // http://codeforhire.com/2013/09/21/setimmediate-and-messagechannel-broken-on-internet-explorer-10/\r\n    // which allows starving postMessage with a busy setTimeout loop.\r\n    // This currently affects IE10 and IE11 which would otherwise be able\r\n    // to use the postMessage based fallbacks.\r\n    var channel = new Channel();\r\n    // Use a fifo linked list to call callbacks in the right order.\r\n    var head = {};\r\n    var tail = head;\r\n    channel['port1'].onmessage = function() {\r\n      if (goog.isDef(head.next)) {\r\n        head = head.next;\r\n        var cb = head.cb;\r\n        head.cb = null;\r\n        cb();\r\n      }\r\n    };\r\n    return function(cb) {\r\n      tail.next = {cb: cb};\r\n      tail = tail.next;\r\n      channel['port2'].postMessage(0);\r\n    };\r\n  }\r\n  // Implementation for IE6 to IE10: Script elements fire an asynchronous\r\n  // onreadystatechange event when inserted into the DOM.\r\n  if (typeof document !== 'undefined' &&\r\n      'onreadystatechange' in\r\n          document.createElement(String(goog.dom.TagName.SCRIPT))) {\r\n    return function(cb) {\r\n      var script = /** @type {!HTMLScriptElement} */ (\r\n          document.createElement(String(goog.dom.TagName.SCRIPT)));\r\n      script.onreadystatechange = function() {\r\n        // Clean up and call the callback.\r\n        script.onreadystatechange = null;\r\n        script.parentNode.removeChild(script);\r\n        script = null;\r\n        cb();\r\n        cb = null;\r\n      };\r\n      document.documentElement.appendChild(script);\r\n    };\r\n  }\r\n  // Fall back to setTimeout with 0. In browsers this creates a delay of 5ms\r\n  // or more.\r\n  // NOTE(user): This fallback is used for IE11.\r\n  return function(cb) {\r\n    goog.global.setTimeout(/** @type {function()} */ (cb), 0);\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Helper function that is overrided to protect callbacks with entry point\r\n * monitor if the application monitors entry points.\r\n * @param {function()} callback Callback function to fire as soon as possible.\r\n * @return {function()} The wrapped callback.\r\n * @private\r\n */\r\ngoog.async.nextTick.wrapCallback_ = goog.functions.identity;\r\n\r\n\r\n// Register the callback function as an entry point, so that it can be\r\n// monitored for exception handling, etc. This has to be done in this file\r\n// since it requires special code to handle all browsers.\r\ngoog.debug.entryPointRegistry.register(\r\n    /**\r\n     * @param {function(!Function): !Function} transformer The transforming\r\n     *     function.\r\n     */\r\n    function(transformer) { goog.async.nextTick.wrapCallback_ = transformer; });\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview A timer class to which other classes and objects can listen on.\r\n * This is only an abstraction above `setInterval`.\r\n *\r\n * @see ../demos/timers.html\r\n */\r\n\r\ngoog.provide('goog.Timer');\r\n\r\ngoog.require('goog.Promise');\r\ngoog.require('goog.events.EventTarget');\r\n\r\n\r\n\r\n/**\r\n * Class for handling timing events.\r\n *\r\n * @param {number=} opt_interval Number of ms between ticks (default: 1ms).\r\n * @param {Object=} opt_timerObject  An object that has `setTimeout`,\r\n *     `setInterval`, `clearTimeout` and `clearInterval`\r\n *     (e.g., `window`).\r\n * @constructor\r\n * @extends {goog.events.EventTarget}\r\n */\r\ngoog.Timer = function(opt_interval, opt_timerObject) {\r\n  goog.events.EventTarget.call(this);\r\n\r\n  /**\r\n   * Number of ms between ticks\r\n   * @private {number}\r\n   */\r\n  this.interval_ = opt_interval || 1;\r\n\r\n  /**\r\n   * An object that implements `setTimeout`, `setInterval`,\r\n   * `clearTimeout` and `clearInterval`. We default to the window\r\n   * object. Changing this on {@link goog.Timer.prototype} changes the object\r\n   * for all timer instances which can be useful if your environment has some\r\n   * other implementation of timers than the `window` object.\r\n   * @private {{setTimeout:!Function, clearTimeout:!Function}}\r\n   */\r\n  this.timerObject_ = /** @type {{setTimeout, clearTimeout}} */ (\r\n      opt_timerObject || goog.Timer.defaultTimerObject);\r\n\r\n  /**\r\n   * Cached `tick_` bound to the object for later use in the timer.\r\n   * @private {Function}\r\n   * @const\r\n   */\r\n  this.boundTick_ = goog.bind(this.tick_, this);\r\n\r\n  /**\r\n   * Firefox browser often fires the timer event sooner (sometimes MUCH sooner)\r\n   * than the requested timeout. So we compare the time to when the event was\r\n   * last fired, and reschedule if appropriate. See also\r\n   * {@link goog.Timer.intervalScale}.\r\n   * @private {number}\r\n   */\r\n  this.last_ = goog.now();\r\n};\r\ngoog.inherits(goog.Timer, goog.events.EventTarget);\r\n\r\n\r\n/**\r\n * Maximum timeout value.\r\n *\r\n * Timeout values too big to fit into a signed 32-bit integer may cause overflow\r\n * in FF, Safari, and Chrome, resulting in the timeout being scheduled\r\n * immediately. It makes more sense simply not to schedule these timeouts, since\r\n * 24.8 days is beyond a reasonable expectation for the browser to stay open.\r\n *\r\n * @private {number}\r\n * @const\r\n */\r\ngoog.Timer.MAX_TIMEOUT_ = 2147483647;\r\n\r\n\r\n/**\r\n * A timer ID that cannot be returned by any known implementation of\r\n * `window.setTimeout`. Passing this value to `window.clearTimeout`\r\n * should therefore be a no-op.\r\n *\r\n * @private {number}\r\n * @const\r\n */\r\ngoog.Timer.INVALID_TIMEOUT_ID_ = -1;\r\n\r\n\r\n/**\r\n * Whether this timer is enabled\r\n * @type {boolean}\r\n */\r\ngoog.Timer.prototype.enabled = false;\r\n\r\n\r\n/**\r\n * An object that implements `setTimeout`, `setInterval`,\r\n * `clearTimeout` and `clearInterval`. We default to the global\r\n * object. Changing `goog.Timer.defaultTimerObject` changes the object for\r\n * all timer instances which can be useful if your environment has some other\r\n * implementation of timers you'd like to use.\r\n * @type {{setTimeout, clearTimeout}}\r\n */\r\ngoog.Timer.defaultTimerObject = goog.global;\r\n\r\n\r\n/**\r\n * Variable that controls the timer error correction. If the timer is called\r\n * before the requested interval times `intervalScale`, which often\r\n * happens on Mozilla, the timer is rescheduled.\r\n * @see {@link #last_}\r\n * @type {number}\r\n */\r\ngoog.Timer.intervalScale = 0.8;\r\n\r\n\r\n/**\r\n * Variable for storing the result of `setInterval`.\r\n * @private {?number}\r\n */\r\ngoog.Timer.prototype.timer_ = null;\r\n\r\n\r\n/**\r\n * Gets the interval of the timer.\r\n * @return {number} interval Number of ms between ticks.\r\n */\r\ngoog.Timer.prototype.getInterval = function() {\r\n  return this.interval_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the interval of the timer.\r\n * @param {number} interval Number of ms between ticks.\r\n */\r\ngoog.Timer.prototype.setInterval = function(interval) {\r\n  this.interval_ = interval;\r\n  if (this.timer_ && this.enabled) {\r\n    // Stop and then start the timer to reset the interval.\r\n    this.stop();\r\n    this.start();\r\n  } else if (this.timer_) {\r\n    this.stop();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Callback for the `setTimeout` used by the timer.\r\n * @private\r\n */\r\ngoog.Timer.prototype.tick_ = function() {\r\n  if (this.enabled) {\r\n    var elapsed = goog.now() - this.last_;\r\n    if (elapsed > 0 && elapsed < this.interval_ * goog.Timer.intervalScale) {\r\n      this.timer_ = this.timerObject_.setTimeout(\r\n          this.boundTick_, this.interval_ - elapsed);\r\n      return;\r\n    }\r\n\r\n    // Prevents setInterval from registering a duplicate timeout when called\r\n    // in the timer event handler.\r\n    if (this.timer_) {\r\n      this.timerObject_.clearTimeout(this.timer_);\r\n      this.timer_ = null;\r\n    }\r\n\r\n    this.dispatchTick();\r\n    // The timer could be stopped in the timer event handler.\r\n    if (this.enabled) {\r\n      // Stop and start to ensure there is always only one timeout even if\r\n      // start is called in the timer event handler.\r\n      this.stop();\r\n      this.start();\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Dispatches the TICK event. This is its own method so subclasses can override.\r\n */\r\ngoog.Timer.prototype.dispatchTick = function() {\r\n  this.dispatchEvent(goog.Timer.TICK);\r\n};\r\n\r\n\r\n/**\r\n * Starts the timer.\r\n */\r\ngoog.Timer.prototype.start = function() {\r\n  this.enabled = true;\r\n\r\n  // If there is no interval already registered, start it now\r\n  if (!this.timer_) {\r\n    // IMPORTANT!\r\n    // window.setInterval in FireFox has a bug - it fires based on\r\n    // absolute time, rather than on relative time. What this means\r\n    // is that if a computer is sleeping/hibernating for 24 hours\r\n    // and the timer interval was configured to fire every 1000ms,\r\n    // then after the PC wakes up the timer will fire, in rapid\r\n    // succession, 3600*24 times.\r\n    // This bug is described here and is already fixed, but it will\r\n    // take time to propagate, so for now I am switching this over\r\n    // to setTimeout logic.\r\n    //     https://bugzilla.mozilla.org/show_bug.cgi?id=376643\r\n    //\r\n    this.timer_ = this.timerObject_.setTimeout(this.boundTick_, this.interval_);\r\n    this.last_ = goog.now();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Stops the timer.\r\n */\r\ngoog.Timer.prototype.stop = function() {\r\n  this.enabled = false;\r\n  if (this.timer_) {\r\n    this.timerObject_.clearTimeout(this.timer_);\r\n    this.timer_ = null;\r\n  }\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.Timer.prototype.disposeInternal = function() {\r\n  goog.Timer.superClass_.disposeInternal.call(this);\r\n  this.stop();\r\n  delete this.timerObject_;\r\n};\r\n\r\n\r\n/**\r\n * Constant for the timer's event type.\r\n * @const\r\n */\r\ngoog.Timer.TICK = 'tick';\r\n\r\n\r\n/**\r\n * Calls the given function once, after the optional pause.\r\n * <p>\r\n * The function is always called asynchronously, even if the delay is 0. This\r\n * is a common trick to schedule a function to run after a batch of browser\r\n * event processing.\r\n *\r\n * @param {function(this:SCOPE)|{handleEvent:function()}|null} listener Function\r\n *     or object that has a handleEvent method.\r\n * @param {number=} opt_delay Milliseconds to wait; default is 0.\r\n * @param {SCOPE=} opt_handler Object in whose scope to call the listener.\r\n * @return {number} A handle to the timer ID.\r\n * @template SCOPE\r\n */\r\ngoog.Timer.callOnce = function(listener, opt_delay, opt_handler) {\r\n  if (goog.isFunction(listener)) {\r\n    if (opt_handler) {\r\n      listener = goog.bind(listener, opt_handler);\r\n    }\r\n  } else if (listener && typeof listener.handleEvent == 'function') {\r\n    // using typeof to prevent strict js warning\r\n    listener = goog.bind(listener.handleEvent, listener);\r\n  } else {\r\n    throw new Error('Invalid listener argument');\r\n  }\r\n\r\n  if (Number(opt_delay) > goog.Timer.MAX_TIMEOUT_) {\r\n    // Timeouts greater than MAX_INT return immediately due to integer\r\n    // overflow in many browsers.  Since MAX_INT is 24.8 days, just don't\r\n    // schedule anything at all.\r\n    return goog.Timer.INVALID_TIMEOUT_ID_;\r\n  } else {\r\n    return goog.Timer.defaultTimerObject.setTimeout(listener, opt_delay || 0);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Clears a timeout initiated by {@link #callOnce}.\r\n * @param {?number} timerId A timer ID.\r\n */\r\ngoog.Timer.clear = function(timerId) {\r\n  goog.Timer.defaultTimerObject.clearTimeout(timerId);\r\n};\r\n\r\n\r\n/**\r\n * @param {number} delay Milliseconds to wait.\r\n * @param {(RESULT|goog.Thenable<RESULT>|Thenable)=} opt_result The value\r\n *     with which the promise will be resolved.\r\n * @return {!goog.Promise<RESULT>} A promise that will be resolved after\r\n *     the specified delay, unless it is canceled first.\r\n * @template RESULT\r\n */\r\ngoog.Timer.promise = function(delay, opt_result) {\r\n  var timerKey = null;\r\n  return new goog\r\n      .Promise(function(resolve, reject) {\r\n        timerKey =\r\n            goog.Timer.callOnce(function() { resolve(opt_result); }, delay);\r\n        if (timerKey == goog.Timer.INVALID_TIMEOUT_ID_) {\r\n          reject(new Error('Failed to schedule timer.'));\r\n        }\r\n      })\r\n      .thenCatch(function(error) {\r\n        // Clear the timer. The most likely reason is \"cancel\" signal.\r\n        goog.Timer.clear(timerKey);\r\n        throw error;\r\n      });\r\n};\r\n","// Copyright 2007 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Definition of the goog.async.Throttle class.\r\n *\r\n * @see ../demos/timers.html\r\n */\r\n\r\ngoog.provide('goog.Throttle');\r\ngoog.provide('goog.async.Throttle');\r\n\r\ngoog.require('goog.Disposable');\r\ngoog.require('goog.Timer');\r\n\r\n\r\n\r\n/**\r\n * Throttle will perform an action that is passed in no more than once\r\n * per interval (specified in milliseconds). If it gets multiple signals\r\n * to perform the action while it is waiting, it will only perform the action\r\n * once at the end of the interval.\r\n * @param {function(this: T, ...?)} listener Function to callback when the\r\n *     action is triggered.\r\n * @param {number} interval Interval over which to throttle. The listener can\r\n *     only be called once per interval.\r\n * @param {T=} opt_handler Object in whose scope to call the listener.\r\n * @constructor\r\n * @struct\r\n * @extends {goog.Disposable}\r\n * @final\r\n * @template T\r\n */\r\ngoog.async.Throttle = function(listener, interval, opt_handler) {\r\n  goog.async.Throttle.base(this, 'constructor');\r\n\r\n  /**\r\n   * Function to callback\r\n   * @type {function(this: T, ...?)}\r\n   * @private\r\n   */\r\n  this.listener_ =\r\n      opt_handler != null ? goog.bind(listener, opt_handler) : listener;\r\n\r\n  /**\r\n   * Interval for the throttle time\r\n   * @type {number}\r\n   * @private\r\n   */\r\n  this.interval_ = interval;\r\n\r\n  /**\r\n   * Cached callback function invoked after the throttle timeout completes\r\n   * @type {Function}\r\n   * @private\r\n   */\r\n  this.callback_ = goog.bind(this.onTimer_, this);\r\n\r\n  /**\r\n   * The last arguments passed into `fire`.\r\n   * @private {!IArrayLike}\r\n   */\r\n  this.args_ = [];\r\n};\r\ngoog.inherits(goog.async.Throttle, goog.Disposable);\r\n\r\n\r\n\r\n/**\r\n * A deprecated alias.\r\n * @deprecated Use goog.async.Throttle instead.\r\n * @constructor\r\n * @final\r\n */\r\ngoog.Throttle = goog.async.Throttle;\r\n\r\n\r\n/**\r\n * Indicates that the action is pending and needs to be fired.\r\n * @type {boolean}\r\n * @private\r\n */\r\ngoog.async.Throttle.prototype.shouldFire_ = false;\r\n\r\n\r\n/**\r\n * Indicates the count of nested pauses currently in effect on the throttle.\r\n * When this count is not zero, fired actions will be postponed until the\r\n * throttle is resumed enough times to drop the pause count to zero.\r\n * @type {number}\r\n * @private\r\n */\r\ngoog.async.Throttle.prototype.pauseCount_ = 0;\r\n\r\n\r\n/**\r\n * Timer for scheduling the next callback\r\n * @type {?number}\r\n * @private\r\n */\r\ngoog.async.Throttle.prototype.timer_ = null;\r\n\r\n\r\n/**\r\n * Notifies the throttle that the action has happened. It will throttle the call\r\n * so that the callback is not called too often according to the interval\r\n * parameter passed to the constructor, passing the arguments from the last call\r\n * of this function into the throttled function.\r\n * @param {...?} var_args Arguments to pass on to the throttled function.\r\n */\r\ngoog.async.Throttle.prototype.fire = function(var_args) {\r\n  this.args_ = arguments;\r\n  if (!this.timer_ && !this.pauseCount_) {\r\n    this.doAction_();\r\n  } else {\r\n    this.shouldFire_ = true;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Cancels any pending action callback. The throttle can be restarted by\r\n * calling {@link #fire}.\r\n */\r\ngoog.async.Throttle.prototype.stop = function() {\r\n  if (this.timer_) {\r\n    goog.Timer.clear(this.timer_);\r\n    this.timer_ = null;\r\n    this.shouldFire_ = false;\r\n    this.args_ = [];\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Pauses the throttle.  All pending and future action callbacks will be\r\n * delayed until the throttle is resumed.  Pauses can be nested.\r\n */\r\ngoog.async.Throttle.prototype.pause = function() {\r\n  this.pauseCount_++;\r\n};\r\n\r\n\r\n/**\r\n * Resumes the throttle.  If doing so drops the pausing count to zero, pending\r\n * action callbacks will be executed as soon as possible, but still no sooner\r\n * than an interval's delay after the previous call.  Future action callbacks\r\n * will be executed as normal.\r\n */\r\ngoog.async.Throttle.prototype.resume = function() {\r\n  this.pauseCount_--;\r\n  if (!this.pauseCount_ && this.shouldFire_ && !this.timer_) {\r\n    this.shouldFire_ = false;\r\n    this.doAction_();\r\n  }\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.async.Throttle.prototype.disposeInternal = function() {\r\n  goog.async.Throttle.base(this, 'disposeInternal');\r\n  this.stop();\r\n};\r\n\r\n\r\n/**\r\n * Handler for the timer to fire the throttle\r\n * @private\r\n */\r\ngoog.async.Throttle.prototype.onTimer_ = function() {\r\n  this.timer_ = null;\r\n\r\n  if (this.shouldFire_ && !this.pauseCount_) {\r\n    this.shouldFire_ = false;\r\n    this.doAction_();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Calls the callback\r\n * @private\r\n */\r\ngoog.async.Throttle.prototype.doAction_ = function() {\r\n  this.timer_ = goog.Timer.callOnce(this.callback_, this.interval_);\r\n  this.listener_.apply(null, this.args_);\r\n};\r\n","// Copyright 2005 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Class to create objects which want to handle multiple events\r\n * and have their listeners easily cleaned up via a dispose method.\r\n *\r\n * Example:\r\n * <pre>\r\n * function Something() {\r\n *   Something.base(this);\r\n *\r\n *   ... set up object ...\r\n *\r\n *   // Add event listeners\r\n *   this.listen(this.starEl, goog.events.EventType.CLICK, this.handleStar);\r\n *   this.listen(this.headerEl, goog.events.EventType.CLICK, this.expand);\r\n *   this.listen(this.collapseEl, goog.events.EventType.CLICK, this.collapse);\r\n *   this.listen(this.infoEl, goog.events.EventType.MOUSEOVER, this.showHover);\r\n *   this.listen(this.infoEl, goog.events.EventType.MOUSEOUT, this.hideHover);\r\n * }\r\n * goog.inherits(Something, goog.events.EventHandler);\r\n *\r\n * Something.prototype.disposeInternal = function() {\r\n *   Something.base(this, 'disposeInternal');\r\n *   goog.dom.removeNode(this.container);\r\n * };\r\n *\r\n *\r\n * // Then elsewhere:\r\n *\r\n * var activeSomething = null;\r\n * function openSomething() {\r\n *   activeSomething = new Something();\r\n * }\r\n *\r\n * function closeSomething() {\r\n *   if (activeSomething) {\r\n *     activeSomething.dispose();  // Remove event listeners\r\n *     activeSomething = null;\r\n *   }\r\n * }\r\n * </pre>\r\n *\r\n */\r\n\r\ngoog.provide('goog.events.EventHandler');\r\n\r\ngoog.require('goog.Disposable');\r\ngoog.require('goog.events');\r\ngoog.require('goog.object');\r\n\r\ngoog.forwardDeclare('goog.events.EventWrapper');\r\n\r\n\r\n\r\n/**\r\n * Super class for objects that want to easily manage a number of event\r\n * listeners.  It allows a short cut to listen and also provides a quick way\r\n * to remove all events listeners belonging to this object.\r\n * @param {SCOPE=} opt_scope Object in whose scope to call the listeners.\r\n * @constructor\r\n * @extends {goog.Disposable}\r\n * @template SCOPE\r\n */\r\ngoog.events.EventHandler = function(opt_scope) {\r\n  goog.Disposable.call(this);\r\n  // TODO(mknichel): Rename this to this.scope_ and fix the classes in google3\r\n  // that access this private variable. :(\r\n  this.handler_ = opt_scope;\r\n\r\n  /**\r\n   * Keys for events that are being listened to.\r\n   * @type {!Object<!goog.events.Key>}\r\n   * @private\r\n   */\r\n  this.keys_ = {};\r\n};\r\ngoog.inherits(goog.events.EventHandler, goog.Disposable);\r\n\r\n\r\n/**\r\n * Utility array used to unify the cases of listening for an array of types\r\n * and listening for a single event, without using recursion or allocating\r\n * an array each time.\r\n * @type {!Array<string>}\r\n * @const\r\n * @private\r\n */\r\ngoog.events.EventHandler.typeArray_ = [];\r\n\r\n\r\n/**\r\n * Listen to an event on a Listenable.  If the function is omitted then the\r\n * EventHandler's handleEvent method will be used.\r\n * @param {goog.events.ListenableType} src Event source.\r\n * @param {string|Array<string>|\r\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\r\n *     type Event type to listen for or array of event types.\r\n * @param {function(this:SCOPE, EVENTOBJ):?|{handleEvent:function(?):?}|null=}\r\n *     opt_fn Optional callback function to be used as the listener or an object\r\n *     with handleEvent function.\r\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template EVENTOBJ, THIS\r\n */\r\ngoog.events.EventHandler.prototype.listen = function(\r\n    src, type, opt_fn, opt_options) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  return self.listen_(src, type, opt_fn, opt_options);\r\n};\r\n\r\n\r\n/**\r\n * Listen to an event on a Listenable.  If the function is omitted then the\r\n * EventHandler's handleEvent method will be used.\r\n * @param {goog.events.ListenableType} src Event source.\r\n * @param {string|Array<string>|\r\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\r\n *     type Event type to listen for or array of event types.\r\n * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(this:T, ?):?}|\r\n *     null|undefined} fn Optional callback function to be used as the\r\n *     listener or an object with handleEvent function.\r\n * @param {boolean|!AddEventListenerOptions|undefined} options\r\n * @param {T} scope Object in whose scope to call the listener.\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template T, EVENTOBJ, THIS\r\n */\r\ngoog.events.EventHandler.prototype.listenWithScope = function(\r\n    src, type, fn, options, scope) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  // TODO(mknichel): Deprecate this function.\r\n  return self.listen_(src, type, fn, options, scope);\r\n};\r\n\r\n\r\n/**\r\n * Listen to an event on a Listenable.  If the function is omitted then the\r\n * EventHandler's handleEvent method will be used.\r\n * @param {goog.events.ListenableType} src Event source.\r\n * @param {string|Array<string>|\r\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\r\n *     type Event type to listen for or array of event types.\r\n * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null=} opt_fn\r\n *     Optional callback function to be used as the listener or an object with\r\n *     handleEvent function.\r\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\r\n * @param {Object=} opt_scope Object in whose scope to call the listener.\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template EVENTOBJ, THIS\r\n * @private\r\n */\r\ngoog.events.EventHandler.prototype.listen_ = function(\r\n    src, type, opt_fn, opt_options, opt_scope) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  if (!goog.isArray(type)) {\r\n    if (type) {\r\n      goog.events.EventHandler.typeArray_[0] = type.toString();\r\n    }\r\n    type = goog.events.EventHandler.typeArray_;\r\n  }\r\n  for (var i = 0; i < type.length; i++) {\r\n    var listenerObj = goog.events.listen(\r\n        src, type[i], opt_fn || self.handleEvent, opt_options || false,\r\n        opt_scope || self.handler_ || self);\r\n\r\n    if (!listenerObj) {\r\n      // When goog.events.listen run on OFF_AND_FAIL or OFF_AND_SILENT\r\n      // (goog.events.CaptureSimulationMode) in IE8-, it will return null\r\n      // value.\r\n      return self;\r\n    }\r\n\r\n    var key = listenerObj.key;\r\n    self.keys_[key] = listenerObj;\r\n  }\r\n\r\n  return self;\r\n};\r\n\r\n\r\n/**\r\n * Listen to an event on a Listenable.  If the function is omitted, then the\r\n * EventHandler's handleEvent method will be used. After the event has fired the\r\n * event listener is removed from the target. If an array of event types is\r\n * provided, each event type will be listened to once.\r\n * @param {goog.events.ListenableType} src Event source.\r\n * @param {string|Array<string>|\r\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\r\n *     type Event type to listen for or array of event types.\r\n * @param {function(this:SCOPE, EVENTOBJ):?|{handleEvent:function(?):?}|null=}\r\n * opt_fn\r\n *    Optional callback function to be used as the listener or an object with\r\n *    handleEvent function.\r\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template EVENTOBJ, THIS\r\n */\r\ngoog.events.EventHandler.prototype.listenOnce = function(\r\n    src, type, opt_fn, opt_options) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  return self.listenOnce_(src, type, opt_fn, opt_options);\r\n};\r\n\r\n\r\n/**\r\n * Listen to an event on a Listenable.  If the function is omitted, then the\r\n * EventHandler's handleEvent method will be used. After the event has fired the\r\n * event listener is removed from the target. If an array of event types is\r\n * provided, each event type will be listened to once.\r\n * @param {goog.events.ListenableType} src Event source.\r\n * @param {string|Array<string>|\r\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\r\n *     type Event type to listen for or array of event types.\r\n * @param {function(this:T, EVENTOBJ):?|{handleEvent:function(this:T, ?):?}|\r\n *     null|undefined} fn Optional callback function to be used as the\r\n *     listener or an object with handleEvent function.\r\n * @param {boolean|undefined} capture Optional whether to use capture phase.\r\n * @param {T} scope Object in whose scope to call the listener.\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template T, EVENTOBJ, THIS\r\n */\r\ngoog.events.EventHandler.prototype.listenOnceWithScope = function(\r\n    src, type, fn, capture, scope) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  // TODO(mknichel): Deprecate this function.\r\n  return self.listenOnce_(src, type, fn, capture, scope);\r\n};\r\n\r\n\r\n/**\r\n * Listen to an event on a Listenable.  If the function is omitted, then the\r\n * EventHandler's handleEvent method will be used. After the event has fired\r\n * the event listener is removed from the target. If an array of event types is\r\n * provided, each event type will be listened to once.\r\n * @param {goog.events.ListenableType} src Event source.\r\n * @param {string|Array<string>|\r\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\r\n *     type Event type to listen for or array of event types.\r\n * @param {function(EVENTOBJ):?|{handleEvent:function(?):?}|null=} opt_fn\r\n *    Optional callback function to be used as the listener or an object with\r\n *    handleEvent function.\r\n * @param {(boolean|!AddEventListenerOptions)=} opt_options\r\n * @param {Object=} opt_scope Object in whose scope to call the listener.\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template EVENTOBJ, THIS\r\n * @private\r\n */\r\ngoog.events.EventHandler.prototype.listenOnce_ = function(\r\n    src, type, opt_fn, opt_options, opt_scope) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  if (goog.isArray(type)) {\r\n    for (var i = 0; i < type.length; i++) {\r\n      self.listenOnce_(src, type[i], opt_fn, opt_options, opt_scope);\r\n    }\r\n  } else {\r\n    var listenerObj = goog.events.listenOnce(\r\n        src, type, opt_fn || self.handleEvent, opt_options,\r\n        opt_scope || self.handler_ || self);\r\n    if (!listenerObj) {\r\n      // When goog.events.listen run on OFF_AND_FAIL or OFF_AND_SILENT\r\n      // (goog.events.CaptureSimulationMode) in IE8-, it will return null\r\n      // value.\r\n      return self;\r\n    }\r\n\r\n    var key = listenerObj.key;\r\n    self.keys_[key] = listenerObj;\r\n  }\r\n\r\n  return self;\r\n};\r\n\r\n\r\n/**\r\n * Adds an event listener with a specific event wrapper on a DOM Node or an\r\n * object that has implemented {@link goog.events.EventTarget}. A listener can\r\n * only be added once to an object.\r\n *\r\n * @param {EventTarget|goog.events.EventTarget} src The node to listen to\r\n *     events on.\r\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\r\n * @param {function(this:SCOPE, ?):?|{handleEvent:function(?):?}|null} listener\r\n *     Callback method, or an object with a handleEvent function.\r\n * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to\r\n *     false).\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template THIS\r\n */\r\ngoog.events.EventHandler.prototype.listenWithWrapper = function(\r\n    src, wrapper, listener, opt_capt) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  // TODO(mknichel): Remove the opt_scope from this function and then\r\n  // templatize it.\r\n  return self.listenWithWrapper_(src, wrapper, listener, opt_capt);\r\n};\r\n\r\n\r\n/**\r\n * Adds an event listener with a specific event wrapper on a DOM Node or an\r\n * object that has implemented {@link goog.events.EventTarget}. A listener can\r\n * only be added once to an object.\r\n *\r\n * @param {EventTarget|goog.events.EventTarget} src The node to listen to\r\n *     events on.\r\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\r\n * @param {function(this:T, ?):?|{handleEvent:function(this:T, ?):?}|null}\r\n *     listener Optional callback function to be used as the\r\n *     listener or an object with handleEvent function.\r\n * @param {boolean|undefined} capture Optional whether to use capture phase.\r\n * @param {T} scope Object in whose scope to call the listener.\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template T, THIS\r\n */\r\ngoog.events.EventHandler.prototype.listenWithWrapperAndScope = function(\r\n    src, wrapper, listener, capture, scope) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  // TODO(mknichel): Deprecate this function.\r\n  return self.listenWithWrapper_(src, wrapper, listener, capture, scope);\r\n};\r\n\r\n\r\n/**\r\n * Adds an event listener with a specific event wrapper on a DOM Node or an\r\n * object that has implemented {@link goog.events.EventTarget}. A listener can\r\n * only be added once to an object.\r\n *\r\n * @param {EventTarget|goog.events.EventTarget} src The node to listen to\r\n *     events on.\r\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\r\n * @param {function(?):?|{handleEvent:function(?):?}|null} listener Callback\r\n *     method, or an object with a handleEvent function.\r\n * @param {boolean=} opt_capt Whether to fire in capture phase (defaults to\r\n *     false).\r\n * @param {Object=} opt_scope Element in whose scope to call the listener.\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template THIS\r\n * @private\r\n */\r\ngoog.events.EventHandler.prototype.listenWithWrapper_ = function(\r\n    src, wrapper, listener, opt_capt, opt_scope) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  wrapper.listen(\r\n      src, listener, opt_capt, opt_scope || self.handler_ || self, self);\r\n  return self;\r\n};\r\n\r\n\r\n/**\r\n * @return {number} Number of listeners registered by this handler.\r\n */\r\ngoog.events.EventHandler.prototype.getListenerCount = function() {\r\n  var count = 0;\r\n  for (var key in this.keys_) {\r\n    if (Object.prototype.hasOwnProperty.call(this.keys_, key)) {\r\n      count++;\r\n    }\r\n  }\r\n  return count;\r\n};\r\n\r\n\r\n/**\r\n * Unlistens on an event.\r\n * @param {goog.events.ListenableType} src Event source.\r\n * @param {string|Array<string>|\r\n *     !goog.events.EventId<EVENTOBJ>|!Array<!goog.events.EventId<EVENTOBJ>>}\r\n *     type Event type or array of event types to unlisten to.\r\n * @param {function(this:?, EVENTOBJ):?|{handleEvent:function(?):?}|null=}\r\n *     opt_fn Optional callback function to be used as the listener or an object\r\n *     with handleEvent function.\r\n * @param {(boolean|!EventListenerOptions)=} opt_options\r\n * @param {Object=} opt_scope Object in whose scope to call the listener.\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template EVENTOBJ, THIS\r\n */\r\ngoog.events.EventHandler.prototype.unlisten = function(\r\n    src, type, opt_fn, opt_options, opt_scope) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  if (goog.isArray(type)) {\r\n    for (var i = 0; i < type.length; i++) {\r\n      self.unlisten(src, type[i], opt_fn, opt_options, opt_scope);\r\n    }\r\n  } else {\r\n    var capture =\r\n        goog.isObject(opt_options) ? !!opt_options.capture : !!opt_options;\r\n    var listener = goog.events.getListener(\r\n        src, type, opt_fn || self.handleEvent, capture,\r\n        opt_scope || self.handler_ || self);\r\n\r\n    if (listener) {\r\n      goog.events.unlistenByKey(listener);\r\n      delete self.keys_[listener.key];\r\n    }\r\n  }\r\n\r\n  return self;\r\n};\r\n\r\n\r\n/**\r\n * Removes an event listener which was added with listenWithWrapper().\r\n *\r\n * @param {EventTarget|goog.events.EventTarget} src The target to stop\r\n *     listening to events on.\r\n * @param {goog.events.EventWrapper} wrapper Event wrapper to use.\r\n * @param {function(?):?|{handleEvent:function(?):?}|null} listener The\r\n *     listener function to remove.\r\n * @param {boolean=} opt_capt In DOM-compliant browsers, this determines\r\n *     whether the listener is fired during the capture or bubble phase of the\r\n *     event.\r\n * @param {Object=} opt_scope Element in whose scope to call the listener.\r\n * @return {THIS} This object, allowing for chaining of calls.\r\n * @this {THIS}\r\n * @template THIS\r\n */\r\ngoog.events.EventHandler.prototype.unlistenWithWrapper = function(\r\n    src, wrapper, listener, opt_capt, opt_scope) {\r\n  var self = /** @type {!goog.events.EventHandler} */ (this);\r\n  wrapper.unlisten(\r\n      src, listener, opt_capt, opt_scope || self.handler_ || self, self);\r\n  return self;\r\n};\r\n\r\n\r\n/**\r\n * Unlistens to all events.\r\n */\r\ngoog.events.EventHandler.prototype.removeAll = function() {\r\n  goog.object.forEach(this.keys_, function(listenerObj, key) {\r\n    if (this.keys_.hasOwnProperty(key)) {\r\n      goog.events.unlistenByKey(listenerObj);\r\n    }\r\n  }, this);\r\n\r\n  this.keys_ = {};\r\n};\r\n\r\n\r\n/**\r\n * Disposes of this EventHandler and removes all listeners that it registered.\r\n * @override\r\n * @protected\r\n */\r\ngoog.events.EventHandler.prototype.disposeInternal = function() {\r\n  goog.events.EventHandler.superClass_.disposeInternal.call(this);\r\n  this.removeAll();\r\n};\r\n\r\n\r\n/**\r\n * Default event handler\r\n * @param {goog.events.Event} e Event object.\r\n */\r\ngoog.events.EventHandler.prototype.handleEvent = function(e) {\r\n  throw new Error('EventHandler.handleEvent not implemented');\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Provides a utility for tracing and debugging WebChannel\r\n *     requests.\r\n */\r\n\r\n\r\ngoog.provide('goog.labs.net.webChannel.WebChannelDebug');\r\n\r\ngoog.require('goog.json');\r\ngoog.require('goog.log');\r\n\r\ngoog.forwardDeclare('goog.Uri');\r\ngoog.forwardDeclare('goog.net.XmlHttp.ReadyState');\r\n\r\n\r\n\r\n/**\r\n * Logs and keeps a buffer of debugging info for the Channel.\r\n *\r\n * @constructor\r\n * @struct\r\n * @final\r\n */\r\ngoog.labs.net.webChannel.WebChannelDebug = function() {\r\n  /**\r\n   * The logger instance.\r\n   * @const\r\n   * @private {?goog.log.Logger}\r\n   */\r\n  this.logger_ = goog.log.getLogger('goog.labs.net.webChannel.WebChannelDebug');\r\n\r\n  /**\r\n   * Whether to enable redact. Defaults to true.\r\n   * @private {boolean}\r\n   */\r\n  this.redactEnabled_ = true;\r\n};\r\n\r\n\r\ngoog.scope(function() {\r\nvar WebChannelDebug = goog.labs.net.webChannel.WebChannelDebug;\r\n\r\n\r\n/**\r\n * Turns off redact.\r\n */\r\nWebChannelDebug.prototype.disableRedact = function() {\r\n  this.redactEnabled_ = false;\r\n};\r\n\r\n\r\n/**\r\n * Logs that the browser went offline during the lifetime of a request.\r\n * @param {goog.Uri} url The URL being requested.\r\n */\r\nWebChannelDebug.prototype.browserOfflineResponse = function(url) {\r\n  this.info(function() {\r\n    return 'BROWSER_OFFLINE: ' + url;\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Logs an XmlHttp request..\r\n * @param {string} verb The request type (GET/POST).\r\n * @param {goog.Uri} uri The request destination.\r\n * @param {string|number|undefined} id The request id.\r\n * @param {number} attempt Which attempt # the request was.\r\n * @param {?string} postData The data posted in the request.\r\n */\r\nWebChannelDebug.prototype.xmlHttpChannelRequest = function(\r\n    verb, uri, id, attempt, postData) {\r\n  var self = this;\r\n  this.info(function() {\r\n    return 'XMLHTTP REQ (' + id + ') [attempt ' + attempt + ']: ' + verb +\r\n        '\\n' + uri + '\\n' + self.maybeRedactPostData_(postData);\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Logs the meta data received from an XmlHttp request.\r\n * @param {string} verb The request type (GET/POST).\r\n * @param {goog.Uri} uri The request destination.\r\n * @param {string|number|undefined} id The request id.\r\n * @param {number} attempt Which attempt # the request was.\r\n * @param {goog.net.XmlHttp.ReadyState} readyState The ready state.\r\n * @param {number} statusCode The HTTP status code.\r\n */\r\nWebChannelDebug.prototype.xmlHttpChannelResponseMetaData = function(\r\n    verb, uri, id, attempt, readyState, statusCode) {\r\n  this.info(function() {\r\n    return 'XMLHTTP RESP (' + id + ') [ attempt ' + attempt + ']: ' + verb +\r\n        '\\n' + uri + '\\n' + readyState + ' ' + statusCode;\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Logs the response data received from an XmlHttp request.\r\n * @param {string|number|undefined} id The request id.\r\n * @param {?string} responseText The response text.\r\n * @param {?string=} opt_desc Optional request description.\r\n */\r\nWebChannelDebug.prototype.xmlHttpChannelResponseText = function(\r\n    id, responseText, opt_desc) {\r\n  var self = this;\r\n  this.info(function() {\r\n    return 'XMLHTTP TEXT (' + id + '): ' + self.redactResponse_(responseText) +\r\n        (opt_desc ? ' ' + opt_desc : '');\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Logs a request timeout.\r\n * @param {goog.Uri} uri The uri that timed out.\r\n */\r\nWebChannelDebug.prototype.timeoutResponse = function(uri) {\r\n  this.info(function() {\r\n    return 'TIMEOUT: ' + uri;\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Logs a debug message.\r\n * @param {!goog.debug.Loggable} text The message.\r\n */\r\nWebChannelDebug.prototype.debug = function(text) {\r\n  goog.log.fine(this.logger_, text);\r\n};\r\n\r\n\r\n/**\r\n * Logs an exception\r\n * @param {Error} e The error or error event.\r\n * @param {goog.debug.Loggable=} opt_msg The optional message,\r\n *     defaults to 'Exception'.\r\n */\r\nWebChannelDebug.prototype.dumpException = function(e, opt_msg) {\r\n  goog.log.error(this.logger_, opt_msg || 'Exception', e);\r\n};\r\n\r\n\r\n/**\r\n * Logs an info message.\r\n * @param {!goog.debug.Loggable} text The message.\r\n */\r\nWebChannelDebug.prototype.info = function(text) {\r\n  goog.log.info(this.logger_, text);\r\n};\r\n\r\n\r\n/**\r\n * Logs a warning message.\r\n * @param {!goog.debug.Loggable} text The message.\r\n */\r\nWebChannelDebug.prototype.warning = function(text) {\r\n  goog.log.warning(this.logger_, text);\r\n};\r\n\r\n\r\n/**\r\n * Logs a severe message.\r\n * @param {!goog.debug.Loggable} text The message.\r\n */\r\nWebChannelDebug.prototype.severe = function(text) {\r\n  goog.log.error(this.logger_, text);\r\n};\r\n\r\n\r\n/**\r\n * Removes potentially private data from a response so that we don't\r\n * accidentally save private and personal data to the server logs.\r\n * @param {?string} responseText A JSON response to clean.\r\n * @return {?string} The cleaned response.\r\n * @private\r\n */\r\nWebChannelDebug.prototype.redactResponse_ = function(responseText) {\r\n  if (!this.redactEnabled_) {\r\n    return responseText;\r\n  }\r\n\r\n  if (!responseText) {\r\n    return null;\r\n  }\r\n\r\n  try {\r\n    var responseArray = JSON.parse(responseText);\r\n    if (responseArray) {\r\n      for (var i = 0; i < responseArray.length; i++) {\r\n        if (goog.isArray(responseArray[i])) {\r\n          this.maybeRedactArray_(responseArray[i]);\r\n        }\r\n      }\r\n    }\r\n\r\n    return goog.json.serialize(responseArray);\r\n  } catch (e) {\r\n    this.debug('Exception parsing expected JS array - probably was not JS');\r\n    return responseText;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Removes data from a response array that may be sensitive.\r\n * @param {!Array<?>} array The array to clean.\r\n * @private\r\n */\r\nWebChannelDebug.prototype.maybeRedactArray_ = function(array) {\r\n  if (array.length < 2) {\r\n    return;\r\n  }\r\n  var dataPart = array[1];\r\n  if (!goog.isArray(dataPart)) {\r\n    return;\r\n  }\r\n  if (dataPart.length < 1) {\r\n    return;\r\n  }\r\n\r\n  var type = dataPart[0];\r\n  if (type != 'noop' && type != 'stop' && type != 'close') {\r\n    // redact all fields in the array\r\n    for (var i = 1; i < dataPart.length; i++) {\r\n      dataPart[i] = '';\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Removes potentially private data from a request POST body so that we don't\r\n * accidentally save private and personal data to the server logs.\r\n * @param {?string} data The data string to clean.\r\n * @return {?string} The data string with sensitive data replaced by 'redacted'.\r\n * @private\r\n */\r\nWebChannelDebug.prototype.maybeRedactPostData_ = function(data) {\r\n  if (!this.redactEnabled_) {\r\n    return data;\r\n  }\r\n\r\n  if (!data) {\r\n    return null;\r\n  }\r\n  var out = '';\r\n  var params = data.split('&');\r\n  for (var i = 0; i < params.length; i++) {\r\n    var param = params[i];\r\n    var keyValue = param.split('=');\r\n    if (keyValue.length > 1) {\r\n      var key = keyValue[0];\r\n      var value = keyValue[1];\r\n\r\n      var keyParts = key.split('_');\r\n      if (keyParts.length >= 2 && keyParts[1] == 'type') {\r\n        out += key + '=' + value + '&';\r\n      } else {\r\n        out += key + '=' +\r\n            'redacted' +\r\n            '&';\r\n      }\r\n    }\r\n  }\r\n  return out;\r\n};\r\n});  // goog.scope\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Static utilities for collecting stats associated with\r\n * ChannelRequest.\r\n */\r\n\r\n\r\ngoog.provide('goog.labs.net.webChannel.requestStats');\r\ngoog.provide('goog.labs.net.webChannel.requestStats.Event');\r\ngoog.provide('goog.labs.net.webChannel.requestStats.ServerReachability');\r\ngoog.provide('goog.labs.net.webChannel.requestStats.ServerReachabilityEvent');\r\ngoog.provide('goog.labs.net.webChannel.requestStats.Stat');\r\ngoog.provide('goog.labs.net.webChannel.requestStats.StatEvent');\r\ngoog.provide('goog.labs.net.webChannel.requestStats.TimingEvent');\r\n\r\ngoog.require('goog.events.Event');\r\ngoog.require('goog.events.EventTarget');\r\n\r\n\r\ngoog.scope(function() {\r\nvar requestStats = goog.labs.net.webChannel.requestStats;\r\n\r\n\r\n/**\r\n * Events fired.\r\n * @const\r\n */\r\nrequestStats.Event = {};\r\n\r\n\r\n/**\r\n * Singleton event target for firing stat events\r\n * @type {goog.events.EventTarget}\r\n * @private\r\n */\r\nrequestStats.statEventTarget_ = new goog.events.EventTarget();\r\n\r\n\r\n/**\r\n * The type of event that occurs every time some information about how reachable\r\n * the server is is discovered.\r\n */\r\nrequestStats.Event.SERVER_REACHABILITY_EVENT = 'serverreachability';\r\n\r\n\r\n/**\r\n * Types of events which reveal information about the reachability of the\r\n * server.\r\n * @enum {number}\r\n */\r\nrequestStats.ServerReachability = {\r\n  REQUEST_MADE: 1,\r\n  REQUEST_SUCCEEDED: 2,\r\n  REQUEST_FAILED: 3,\r\n  BACK_CHANNEL_ACTIVITY: 4  // any response data received\r\n};\r\n\r\n\r\n\r\n/**\r\n * Event class for SERVER_REACHABILITY_EVENT.\r\n *\r\n * @param {goog.events.EventTarget} target The stat event target for\r\n       the channel.\r\n * @param {requestStats.ServerReachability} reachabilityType\r\n *     The reachability event type.\r\n * @constructor\r\n * @extends {goog.events.Event}\r\n */\r\nrequestStats.ServerReachabilityEvent = function(target, reachabilityType) {\r\n  goog.events.Event.call(\r\n      this, requestStats.Event.SERVER_REACHABILITY_EVENT, target);\r\n\r\n  /**\r\n   * @type {requestStats.ServerReachability}\r\n   */\r\n  this.reachabilityType = reachabilityType;\r\n};\r\ngoog.inherits(requestStats.ServerReachabilityEvent, goog.events.Event);\r\n\r\n\r\n/**\r\n * Notify the channel that a particular fine grained network event has occurred.\r\n * Should be considered package-private.\r\n * @param {requestStats.ServerReachability} reachabilityType\r\n *     The reachability event type.\r\n */\r\nrequestStats.notifyServerReachabilityEvent = function(reachabilityType) {\r\n  var target = requestStats.statEventTarget_;\r\n  target.dispatchEvent(\r\n      new requestStats.ServerReachabilityEvent(target, reachabilityType));\r\n};\r\n\r\n\r\n/**\r\n * Stat Event that fires when things of interest happen that may be useful for\r\n * applications to know about for stats or debugging purposes.\r\n */\r\nrequestStats.Event.STAT_EVENT = 'statevent';\r\n\r\n\r\n/**\r\n * Enum that identifies events for statistics that are interesting to track.\r\n * @enum {number}\r\n */\r\nrequestStats.Stat = {\r\n  /** Event indicating a new connection attempt. */\r\n  CONNECT_ATTEMPT: 0,\r\n\r\n  /** Event indicating a connection error due to a general network problem. */\r\n  ERROR_NETWORK: 1,\r\n\r\n  /**\r\n   * Event indicating a connection error that isn't due to a general network\r\n   * problem.\r\n   */\r\n  ERROR_OTHER: 2,\r\n\r\n  /** Event indicating the start of test stage one. */\r\n  TEST_STAGE_ONE_START: 3,\r\n\r\n  /** Event indicating the start of test stage two. */\r\n  TEST_STAGE_TWO_START: 4,\r\n\r\n  /** Event indicating the first piece of test data was received. */\r\n  TEST_STAGE_TWO_DATA_ONE: 5,\r\n\r\n  /**\r\n   * Event indicating that the second piece of test data was received and it was\r\n   * received separately from the first.\r\n   */\r\n  TEST_STAGE_TWO_DATA_TWO: 6,\r\n\r\n  /** Event indicating both pieces of test data were received simultaneously. */\r\n  TEST_STAGE_TWO_DATA_BOTH: 7,\r\n\r\n  /** Event indicating stage one of the test request failed. */\r\n  TEST_STAGE_ONE_FAILED: 8,\r\n\r\n  /** Event indicating stage two of the test request failed. */\r\n  TEST_STAGE_TWO_FAILED: 9,\r\n\r\n  /**\r\n   * Event indicating that a buffering proxy is likely between the client and\r\n   * the server.\r\n   */\r\n  PROXY: 10,\r\n\r\n  /**\r\n   * Event indicating that no buffering proxy is likely between the client and\r\n   * the server.\r\n   */\r\n  NOPROXY: 11,\r\n\r\n  /** Event indicating an unknown SID error. */\r\n  REQUEST_UNKNOWN_SESSION_ID: 12,\r\n\r\n  /** Event indicating a bad status code was received. */\r\n  REQUEST_BAD_STATUS: 13,\r\n\r\n  /** Event indicating incomplete data was received */\r\n  REQUEST_INCOMPLETE_DATA: 14,\r\n\r\n  /** Event indicating bad data was received */\r\n  REQUEST_BAD_DATA: 15,\r\n\r\n  /** Event indicating no data was received when data was expected. */\r\n  REQUEST_NO_DATA: 16,\r\n\r\n  /** Event indicating a request timeout. */\r\n  REQUEST_TIMEOUT: 17,\r\n\r\n  /**\r\n   * Event indicating that the server never received our hanging GET and so it\r\n   * is being retried.\r\n   */\r\n  BACKCHANNEL_MISSING: 18,\r\n\r\n  /**\r\n   * Event indicating that we have determined that our hanging GET is not\r\n   * receiving data when it should be. Thus it is dead dead and will be retried.\r\n   */\r\n  BACKCHANNEL_DEAD: 19,\r\n\r\n  /**\r\n   * The browser declared itself offline during the lifetime of a request, or\r\n   * was offline when a request was initially made.\r\n   */\r\n  BROWSER_OFFLINE: 20\r\n};\r\n\r\n\r\n\r\n/**\r\n * Event class for STAT_EVENT.\r\n *\r\n * @param {goog.events.EventTarget} eventTarget The stat event target for\r\n       the channel.\r\n * @param {requestStats.Stat} stat The stat.\r\n * @constructor\r\n * @extends {goog.events.Event}\r\n */\r\nrequestStats.StatEvent = function(eventTarget, stat) {\r\n  goog.events.Event.call(this, requestStats.Event.STAT_EVENT, eventTarget);\r\n\r\n  /**\r\n   * The stat\r\n   * @type {requestStats.Stat}\r\n   */\r\n  this.stat = stat;\r\n\r\n};\r\ngoog.inherits(requestStats.StatEvent, goog.events.Event);\r\n\r\n\r\n/**\r\n * Returns the singleton event target for stat events.\r\n * @return {goog.events.EventTarget} The event target for stat events.\r\n */\r\nrequestStats.getStatEventTarget = function() {\r\n  return requestStats.statEventTarget_;\r\n};\r\n\r\n\r\n/**\r\n * Helper function to call the stat event callback.\r\n * @param {requestStats.Stat} stat The stat.\r\n */\r\nrequestStats.notifyStatEvent = function(stat) {\r\n  var target = requestStats.statEventTarget_;\r\n  target.dispatchEvent(new requestStats.StatEvent(target, stat));\r\n};\r\n\r\n\r\n/**\r\n * An event that fires when POST requests complete successfully, indicating\r\n * the size of the POST and the round trip time.\r\n */\r\nrequestStats.Event.TIMING_EVENT = 'timingevent';\r\n\r\n\r\n\r\n/**\r\n * Event class for requestStats.Event.TIMING_EVENT\r\n *\r\n * @param {goog.events.EventTarget} target The stat event target for\r\n       the channel.\r\n * @param {number} size The number of characters in the POST data.\r\n * @param {number} rtt The total round trip time from POST to response in MS.\r\n * @param {number} retries The number of times the POST had to be retried.\r\n * @constructor\r\n * @extends {goog.events.Event}\r\n */\r\nrequestStats.TimingEvent = function(target, size, rtt, retries) {\r\n  goog.events.Event.call(this, requestStats.Event.TIMING_EVENT, target);\r\n\r\n  /**\r\n   * @type {number}\r\n   */\r\n  this.size = size;\r\n\r\n  /**\r\n   * @type {number}\r\n   */\r\n  this.rtt = rtt;\r\n\r\n  /**\r\n   * @type {number}\r\n   */\r\n  this.retries = retries;\r\n\r\n};\r\ngoog.inherits(requestStats.TimingEvent, goog.events.Event);\r\n\r\n\r\n/**\r\n * Helper function to notify listeners about POST request performance.\r\n *\r\n * @param {number} size Number of characters in the POST data.\r\n * @param {number} rtt The amount of time from POST start to response.\r\n * @param {number} retries The number of times the POST had to be retried.\r\n */\r\nrequestStats.notifyTimingEvent = function(size, rtt, retries) {\r\n  var target = requestStats.statEventTarget_;\r\n  target.dispatchEvent(\r\n      new requestStats.TimingEvent(target, size, rtt, retries));\r\n};\r\n\r\n\r\n/**\r\n * Allows the application to set an execution hooks for when a channel\r\n * starts processing requests. This is useful to track timing or logging\r\n * special information. The function takes no parameters and return void.\r\n * @param {Function} startHook  The function for the start hook.\r\n */\r\nrequestStats.setStartThreadExecutionHook = function(startHook) {\r\n  requestStats.startExecutionHook_ = startHook;\r\n};\r\n\r\n\r\n/**\r\n * Allows the application to set an execution hooks for when a channel\r\n * stops processing requests. This is useful to track timing or logging\r\n * special information. The function takes no parameters and return void.\r\n * @param {Function} endHook  The function for the end hook.\r\n */\r\nrequestStats.setEndThreadExecutionHook = function(endHook) {\r\n  requestStats.endExecutionHook_ = endHook;\r\n};\r\n\r\n\r\n/**\r\n * Application provided execution hook for the start hook.\r\n *\r\n * @type {Function}\r\n * @private\r\n */\r\nrequestStats.startExecutionHook_ = function() {};\r\n\r\n\r\n/**\r\n * Application provided execution hook for the end hook.\r\n *\r\n * @type {Function}\r\n * @private\r\n */\r\nrequestStats.endExecutionHook_ = function() {};\r\n\r\n\r\n/**\r\n * Helper function to call the start hook\r\n */\r\nrequestStats.onStartExecution = function() {\r\n  requestStats.startExecutionHook_();\r\n};\r\n\r\n\r\n/**\r\n * Helper function to call the end hook\r\n */\r\nrequestStats.onEndExecution = function() {\r\n  requestStats.endExecutionHook_();\r\n};\r\n\r\n\r\n/**\r\n * Wrapper around SafeTimeout which calls the start and end execution hooks\r\n * with a try...finally block.\r\n * @param {Function} fn The callback function.\r\n * @param {number} ms The time in MS for the timer.\r\n * @return {number} The ID of the timer.\r\n */\r\nrequestStats.setTimeout = function(fn, ms) {\r\n  if (!goog.isFunction(fn)) {\r\n    throw new Error('Fn must not be null and must be a function');\r\n  }\r\n  return goog.global.setTimeout(function() {\r\n    requestStats.onStartExecution();\r\n    try {\r\n      fn();\r\n    } finally {\r\n      requestStats.onEndExecution();\r\n    }\r\n  }, ms);\r\n};\r\n});  // goog.scope\r\n","// Copyright 2007 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Error codes shared between goog.net.IframeIo and\r\n * goog.net.XhrIo.\r\n */\r\n\r\ngoog.provide('goog.net.ErrorCode');\r\n\r\n\r\n/**\r\n * Error codes\r\n * @enum {number}\r\n */\r\ngoog.net.ErrorCode = {\r\n\r\n  /**\r\n   * There is no error condition.\r\n   */\r\n  NO_ERROR: 0,\r\n\r\n  /**\r\n   * The most common error from iframeio, unfortunately, is that the browser\r\n   * responded with an error page that is classed as a different domain. The\r\n   * situations, are when a browser error page  is shown -- 404, access denied,\r\n   * DNS failure, connection reset etc.)\r\n   *\r\n   */\r\n  ACCESS_DENIED: 1,\r\n\r\n  /**\r\n   * Currently the only case where file not found will be caused is when the\r\n   * code is running on the local file system and a non-IE browser makes a\r\n   * request to a file that doesn't exist.\r\n   */\r\n  FILE_NOT_FOUND: 2,\r\n\r\n  /**\r\n   * If Firefox shows a browser error page, such as a connection reset by\r\n   * server or access denied, then it will fail silently without the error or\r\n   * load handlers firing.\r\n   */\r\n  FF_SILENT_ERROR: 3,\r\n\r\n  /**\r\n   * Custom error provided by the client through the error check hook.\r\n   */\r\n  CUSTOM_ERROR: 4,\r\n\r\n  /**\r\n   * Exception was thrown while processing the request.\r\n   */\r\n  EXCEPTION: 5,\r\n\r\n  /**\r\n   * The Http response returned a non-successful http status code.\r\n   */\r\n  HTTP_ERROR: 6,\r\n\r\n  /**\r\n   * The request was aborted.\r\n   */\r\n  ABORT: 7,\r\n\r\n  /**\r\n   * The request timed out.\r\n   */\r\n  TIMEOUT: 8,\r\n\r\n  /**\r\n   * The resource is not available offline.\r\n   */\r\n  OFFLINE: 9\r\n};\r\n\r\n\r\n/**\r\n * Returns a friendly error message for an error code. These messages are for\r\n * debugging and are not localized.\r\n * @param {goog.net.ErrorCode} errorCode An error code.\r\n * @return {string} A message for debugging.\r\n */\r\ngoog.net.ErrorCode.getDebugMessage = function(errorCode) {\r\n  switch (errorCode) {\r\n    case goog.net.ErrorCode.NO_ERROR:\r\n      return 'No Error';\r\n\r\n    case goog.net.ErrorCode.ACCESS_DENIED:\r\n      return 'Access denied to content document';\r\n\r\n    case goog.net.ErrorCode.FILE_NOT_FOUND:\r\n      return 'File not found';\r\n\r\n    case goog.net.ErrorCode.FF_SILENT_ERROR:\r\n      return 'Firefox silently errored';\r\n\r\n    case goog.net.ErrorCode.CUSTOM_ERROR:\r\n      return 'Application custom error';\r\n\r\n    case goog.net.ErrorCode.EXCEPTION:\r\n      return 'An exception occurred';\r\n\r\n    case goog.net.ErrorCode.HTTP_ERROR:\r\n      return 'Http response at 400 or 500 level';\r\n\r\n    case goog.net.ErrorCode.ABORT:\r\n      return 'Request was aborted';\r\n\r\n    case goog.net.ErrorCode.TIMEOUT:\r\n      return 'Request timed out';\r\n\r\n    case goog.net.ErrorCode.OFFLINE:\r\n      return 'The resource is not available offline';\r\n\r\n    default:\r\n      return 'Unrecognized error code';\r\n  }\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Common events for the network classes.\r\n */\r\n\r\n\r\ngoog.provide('goog.net.EventType');\r\n\r\n\r\n/**\r\n * Event names for network events\r\n * @enum {string}\r\n */\r\ngoog.net.EventType = {\r\n  COMPLETE: 'complete',\r\n  SUCCESS: 'success',\r\n  ERROR: 'error',\r\n  ABORT: 'abort',\r\n  READY: 'ready',\r\n  READY_STATE_CHANGE: 'readystatechange',\r\n  TIMEOUT: 'timeout',\r\n  INCREMENTAL_DATA: 'incrementaldata',\r\n  PROGRESS: 'progress',\r\n  // DOWNLOAD_PROGRESS and UPLOAD_PROGRESS are special events dispatched by\r\n  // goog.net.XhrIo to allow binding listeners specific to each type of\r\n  // progress.\r\n  DOWNLOAD_PROGRESS: 'downloadprogress',\r\n  UPLOAD_PROGRESS: 'uploadprogress'\r\n};\r\n","// Copyright 2010 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Interface for a factory for creating XMLHttpRequest objects\r\n * and metadata about them.\r\n * @author dbk@google.com (David Barrett-Kahn)\r\n */\r\n\r\ngoog.provide('goog.net.XmlHttpFactory');\r\n\r\n/** @suppress {extraRequire} Typedef. */\r\ngoog.require('goog.net.XhrLike');\r\n\r\n\r\n\r\n/**\r\n * Abstract base class for an XmlHttpRequest factory.\r\n * @constructor\r\n */\r\ngoog.net.XmlHttpFactory = function() {};\r\n\r\n\r\n/**\r\n * Cache of options - we only actually call internalGetOptions once.\r\n * @type {?Object}\r\n * @private\r\n */\r\ngoog.net.XmlHttpFactory.prototype.cachedOptions_ = null;\r\n\r\n\r\n/**\r\n * @return {!goog.net.XhrLike.OrNative} A new XhrLike instance.\r\n */\r\ngoog.net.XmlHttpFactory.prototype.createInstance = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @return {Object} Options describing how xhr objects obtained from this\r\n *     factory should be used.\r\n */\r\ngoog.net.XmlHttpFactory.prototype.getOptions = function() {\r\n  return this.cachedOptions_ ||\r\n      (this.cachedOptions_ = this.internalGetOptions());\r\n};\r\n\r\n\r\n/**\r\n * Override this method in subclasses to preserve the caching offered by\r\n * getOptions().\r\n * @return {Object} Options describing how xhr objects obtained from this\r\n *     factory should be used.\r\n * @protected\r\n */\r\ngoog.net.XmlHttpFactory.prototype.internalGetOptions = goog.abstractMethod;\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Low level handling of XMLHttpRequest.\r\n * @author arv@google.com (Erik Arvidsson)\r\n * @author dbk@google.com (David Barrett-Kahn)\r\n */\r\n\r\ngoog.provide('goog.net.DefaultXmlHttpFactory');\r\ngoog.provide('goog.net.XmlHttp');\r\ngoog.provide('goog.net.XmlHttp.OptionType');\r\ngoog.provide('goog.net.XmlHttp.ReadyState');\r\ngoog.provide('goog.net.XmlHttpDefines');\r\n\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.net.WrapperXmlHttpFactory');\r\ngoog.require('goog.net.XmlHttpFactory');\r\n\r\n\r\n/**\r\n * Static class for creating XMLHttpRequest objects.\r\n * @return {!goog.net.XhrLike.OrNative} A new XMLHttpRequest object.\r\n */\r\ngoog.net.XmlHttp = function() {\r\n  return goog.net.XmlHttp.factory_.createInstance();\r\n};\r\n\r\n\r\n/**\r\n * @define {boolean} Whether to assume XMLHttpRequest exists. Setting this to\r\n *     true bypasses the ActiveX probing code.\r\n * NOTE(ruilopes): Due to the way JSCompiler works, this define *will not* strip\r\n * out the ActiveX probing code from binaries.  To achieve this, use\r\n * `goog.net.XmlHttpDefines.ASSUME_NATIVE_XHR` instead.\r\n * TODO(ruilopes): Collapse both defines.\r\n */\r\ngoog.net.XmlHttp.ASSUME_NATIVE_XHR =\r\n    goog.define('goog.net.XmlHttp.ASSUME_NATIVE_XHR', false);\r\n\r\n\r\n/** @const */\r\ngoog.net.XmlHttpDefines = {};\r\n\r\n\r\n/**\r\n * @define {boolean} Whether to assume XMLHttpRequest exists. Setting this to\r\n *     true eliminates the ActiveX probing code.\r\n */\r\ngoog.net.XmlHttpDefines.ASSUME_NATIVE_XHR =\r\n    goog.define('goog.net.XmlHttpDefines.ASSUME_NATIVE_XHR', false);\r\n\r\n\r\n/**\r\n * Gets the options to use with the XMLHttpRequest objects obtained using\r\n * the static methods.\r\n * @return {Object} The options.\r\n */\r\ngoog.net.XmlHttp.getOptions = function() {\r\n  return goog.net.XmlHttp.factory_.getOptions();\r\n};\r\n\r\n\r\n/**\r\n * Type of options that an XmlHttp object can have.\r\n * @enum {number}\r\n */\r\ngoog.net.XmlHttp.OptionType = {\r\n  /**\r\n   * Whether a goog.nullFunction should be used to clear the onreadystatechange\r\n   * handler instead of null.\r\n   */\r\n  USE_NULL_FUNCTION: 0,\r\n\r\n  /**\r\n   * NOTE(user): In IE if send() errors on a *local* request the readystate\r\n   * is still changed to COMPLETE.  We need to ignore it and allow the\r\n   * try/catch around send() to pick up the error.\r\n   */\r\n  LOCAL_REQUEST_ERROR: 1\r\n};\r\n\r\n\r\n/**\r\n * Status constants for XMLHTTP, matches:\r\n * https://msdn.microsoft.com/en-us/library/ms534361(v=vs.85).aspx\r\n * @enum {number}\r\n */\r\ngoog.net.XmlHttp.ReadyState = {\r\n  /**\r\n   * Constant for when xmlhttprequest.readyState is uninitialized\r\n   */\r\n  UNINITIALIZED: 0,\r\n\r\n  /**\r\n   * Constant for when xmlhttprequest.readyState is loading.\r\n   */\r\n  LOADING: 1,\r\n\r\n  /**\r\n   * Constant for when xmlhttprequest.readyState is loaded.\r\n   */\r\n  LOADED: 2,\r\n\r\n  /**\r\n   * Constant for when xmlhttprequest.readyState is in an interactive state.\r\n   */\r\n  INTERACTIVE: 3,\r\n\r\n  /**\r\n   * Constant for when xmlhttprequest.readyState is completed\r\n   */\r\n  COMPLETE: 4\r\n};\r\n\r\n\r\n/**\r\n * The global factory instance for creating XMLHttpRequest objects.\r\n * @type {goog.net.XmlHttpFactory}\r\n * @private\r\n */\r\ngoog.net.XmlHttp.factory_;\r\n\r\n\r\n/**\r\n * Sets the factories for creating XMLHttpRequest objects and their options.\r\n * @param {Function} factory The factory for XMLHttpRequest objects.\r\n * @param {Function} optionsFactory The factory for options.\r\n * @deprecated Use setGlobalFactory instead.\r\n */\r\ngoog.net.XmlHttp.setFactory = function(factory, optionsFactory) {\r\n  goog.net.XmlHttp.setGlobalFactory(\r\n      new goog.net.WrapperXmlHttpFactory(\r\n          goog.asserts.assert(factory), goog.asserts.assert(optionsFactory)));\r\n};\r\n\r\n\r\n/**\r\n * Sets the global factory object.\r\n * @param {!goog.net.XmlHttpFactory} factory New global factory object.\r\n */\r\ngoog.net.XmlHttp.setGlobalFactory = function(factory) {\r\n  goog.net.XmlHttp.factory_ = factory;\r\n};\r\n\r\n\r\n\r\n/**\r\n * Default factory to use when creating xhr objects.  You probably shouldn't be\r\n * instantiating this directly, but rather using it via goog.net.XmlHttp.\r\n * @extends {goog.net.XmlHttpFactory}\r\n * @constructor\r\n */\r\ngoog.net.DefaultXmlHttpFactory = function() {\r\n  goog.net.XmlHttpFactory.call(this);\r\n};\r\ngoog.inherits(goog.net.DefaultXmlHttpFactory, goog.net.XmlHttpFactory);\r\n\r\n\r\n/** @override */\r\ngoog.net.DefaultXmlHttpFactory.prototype.createInstance = function() {\r\n  var progId = this.getProgId_();\r\n  if (progId) {\r\n    return new ActiveXObject(progId);\r\n  } else {\r\n    return new XMLHttpRequest();\r\n  }\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.net.DefaultXmlHttpFactory.prototype.internalGetOptions = function() {\r\n  var progId = this.getProgId_();\r\n  var options = {};\r\n  if (progId) {\r\n    options[goog.net.XmlHttp.OptionType.USE_NULL_FUNCTION] = true;\r\n    options[goog.net.XmlHttp.OptionType.LOCAL_REQUEST_ERROR] = true;\r\n  }\r\n  return options;\r\n};\r\n\r\n\r\n/**\r\n * The ActiveX PROG ID string to use to create xhr's in IE. Lazily initialized.\r\n * @type {string|undefined}\r\n * @private\r\n */\r\ngoog.net.DefaultXmlHttpFactory.prototype.ieProgId_;\r\n\r\n\r\n/**\r\n * Initialize the private state used by other functions.\r\n * @return {string} The ActiveX PROG ID string to use to create xhr's in IE.\r\n * @private\r\n */\r\ngoog.net.DefaultXmlHttpFactory.prototype.getProgId_ = function() {\r\n  if (goog.net.XmlHttp.ASSUME_NATIVE_XHR ||\r\n      goog.net.XmlHttpDefines.ASSUME_NATIVE_XHR) {\r\n    return '';\r\n  }\r\n\r\n  // The following blog post describes what PROG IDs to use to create the\r\n  // XMLHTTP object in Internet Explorer:\r\n  // http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx\r\n  // However we do not (yet) fully trust that this will be OK for old versions\r\n  // of IE on Win9x so we therefore keep the last 2.\r\n  if (!this.ieProgId_ && typeof XMLHttpRequest == 'undefined' &&\r\n      typeof ActiveXObject != 'undefined') {\r\n    // Candidate Active X types.\r\n    var ACTIVE_X_IDENTS = [\r\n      'MSXML2.XMLHTTP.6.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP',\r\n      'Microsoft.XMLHTTP'\r\n    ];\r\n    for (var i = 0; i < ACTIVE_X_IDENTS.length; i++) {\r\n      var candidate = ACTIVE_X_IDENTS[i];\r\n\r\n      try {\r\n        new ActiveXObject(candidate);\r\n        // NOTE(user): cannot assign progid and return candidate in one line\r\n        // because JSCompiler complaings: BUG 658126\r\n        this.ieProgId_ = candidate;\r\n        return candidate;\r\n      } catch (e) {\r\n        // do nothing; try next choice\r\n      }\r\n    }\r\n\r\n    // couldn't find any matches\r\n    throw new Error(\r\n        'Could not create ActiveXObject. ActiveX might be disabled,' +\r\n        ' or MSXML might not be installed');\r\n  }\r\n\r\n  return /** @type {string} */ (this.ieProgId_);\r\n};\r\n\r\n\r\n// Set the global factory to an instance of the default factory.\r\ngoog.net.XmlHttp.setGlobalFactory(new goog.net.DefaultXmlHttpFactory());\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview The API spec for the WebChannel messaging library.\r\n *\r\n * Similar to HTML5 WebSocket and Closure BrowserChannel, WebChannel\r\n * offers an abstraction for point-to-point socket-like communication between\r\n * a browser client and a remote origin.\r\n *\r\n * WebChannels are created via <code>WebChannel</code>. Multiple WebChannels\r\n * may be multiplexed over the same WebChannelTransport, which represents\r\n * the underlying physical connectivity over standard wire protocols\r\n * such as HTTP and SPDY.\r\n *\r\n * A WebChannels in turn represents a logical communication channel between\r\n * the client and server end point. A WebChannel remains open for\r\n * as long as the client or server end-point allows.\r\n *\r\n * Messages may be delivered in-order or out-of-order, reliably or unreliably\r\n * over the same WebChannel. Message delivery guarantees of a WebChannel is\r\n * to be specified by the application code; and the choice of the\r\n * underlying wire protocols is completely transparent to the API users.\r\n *\r\n * Client-to-client messaging via WebRTC based transport may also be support\r\n * via the same WebChannel API in future.\r\n *\r\n * Note that we have no immediate plan to move this API out of labs. While\r\n * the implementation is production ready, the API is subject to change\r\n * (addition only):\r\n * 1. Adopt new Web APIs (mainly whatwg streams) and goog.net.streams.\r\n * 2. New programming models for cloud (on the server-side) may require\r\n *    new APIs to be defined.\r\n * 3. WebRTC DataChannel alignment\r\n *\r\n */\r\n\r\ngoog.provide('goog.net.WebChannel');\r\n\r\ngoog.require('goog.events');\r\ngoog.require('goog.events.Event');\r\ngoog.require('goog.events.Listenable');\r\ngoog.require('goog.net.XmlHttpFactory');\r\n\r\n\r\n\r\n/**\r\n * A WebChannel represents a logical bi-directional channel over which the\r\n * client communicates with a remote server that holds the other endpoint\r\n * of the channel. A WebChannel is always created in the context of a shared\r\n * {@link WebChannelTransport} instance. It is up to the underlying client-side\r\n * and server-side implementations to decide how or when multiplexing is\r\n * to be enabled.\r\n *\r\n * @interface\r\n * @extends {EventTarget}\r\n * @extends {goog.events.Listenable}\r\n */\r\ngoog.net.WebChannel = function() {};\r\n\r\n\r\n\r\n/**\r\n * This interface defines a pluggable API to allow WebChannel runtime to support\r\n * customized algorithms in order to recover from transient failures such as\r\n * those failures caused by network or proxies (intermediaries).\r\n *\r\n * The algorithm may also choose to fail-fast, e.g. switch the client to some\r\n * offline mode.\r\n *\r\n * Extra measurements and logging could also be implemented in the custom\r\n * module, which has the full knowledge of all the state transitions\r\n * (due to failures).\r\n *\r\n * A default algorithm will be provided by the webchannel library itself. Custom\r\n * algorithms are expected to be tailored to specific client platforms or\r\n * networking environments, e.g. mobile, cellular network.\r\n *\r\n * @interface\r\n */\r\ngoog.net.WebChannel.FailureRecovery = function() {};\r\n\r\n\r\n/**\r\n * Configuration spec for newly created WebChannel instances.\r\n *\r\n * WebChannels are configured in the context of the containing\r\n * {@link WebChannelTransport}. The configuration parameters are specified\r\n * when a new instance of WebChannel is created via {@link WebChannelTransport}.\r\n *\r\n * messageHeaders: custom headers to be added to every message sent to the\r\n * server. This object is mutable, and custom headers may be changed, removed,\r\n * or added during the runtime after a channel has been opened.\r\n *\r\n * initMessageHeaders: similar to messageHeaders, but any custom headers will\r\n * be sent only once when the channel is opened. Typical usage is to send\r\n * an auth header to the server, which only checks the auth header at the time\r\n * when the channel is opened.\r\n *\r\n * messageContentType: sent as initMessageHeaders via X-WebChannel-Content-Type,\r\n * to inform the server the MIME type of WebChannel messages.\r\n *\r\n * messageUrlParams: custom url query parameters to be added to every message\r\n * sent to the server. This object is mutable, and custom parameters may be\r\n * changed, removed or added during the runtime after a channel has been opened.\r\n *\r\n * clientProtocolHeaderRequired: whether a special header should be added to\r\n * each message so that the server can dispatch webchannel messages without\r\n * knowing the URL path prefix. Defaults to false.\r\n *\r\n * concurrentRequestLimit: the maximum number of in-flight HTTP requests allowed\r\n * when SPDY is enabled. Currently we only detect SPDY in Chrome.\r\n * This parameter defaults to 10. When SPDY is not enabled, this parameter\r\n * will have no effect.\r\n *\r\n * supportsCrossDomainXhr: setting this to true to allow the use of sub-domains\r\n * (as configured by the server) to send XHRs with the CORS withCredentials\r\n * bit set to true.\r\n *\r\n * testUrl: the test URL for detecting connectivity during the initial\r\n * handshake. This parameter defaults to \"/<channel_url>/test\".\r\n *\r\n * sendRawJson: whether to bypass v8 encoding of client-sent messages.\r\n * This defaults to false now due to legacy servers. New applications should\r\n * always configure this option to true.\r\n *\r\n * httpSessionIdParam: the URL parameter name that contains the session id (\r\n * for sticky routing of HTTP requests). When this param is specified, a server\r\n * that supports this option will respond with an opaque session id as part of\r\n * the initial handshake (via the X-HTTP-Session-Id header); and all the\r\n * subsequent requests will contain the httpSessionIdParam. This option will\r\n * take precedence over any duplicated parameter specified with\r\n * messageUrlParams, whose value will be ignored.\r\n *\r\n * httpHeadersOverwriteParam: the URL parameter name to allow custom HTTP\r\n * headers to be overwritten as a URL param to bypass CORS preflight.\r\n * goog.net.rpc.HttpCors is used to encode the HTTP headers.\r\n *\r\n * backgroundChannelTest: whether to run the channel test (detecting networking\r\n * conditions) as a background process so the OPEN event will be fired sooner\r\n * to reduce the initial handshake delay. This option defaults to true.\r\n * The actual background channel test is not fully implemented.\r\n *\r\n * forceLongPolling: whether to force long-polling from client to server.\r\n * This defaults to false. Long-polling may be necessary when a (MITM) proxy\r\n * is buffering data sent by the server.\r\n *\r\n * fastHandshake: enable true 0-RTT message delivery, including\r\n * leveraging QUIC 0-RTT (which requires GET to be used). This option\r\n * defaults to false. Note it is allowed to send messages before Open event is\r\n * received, after a channel has been opened. In order to enable 0-RTT,\r\n * messages will be encoded as part of URL and therefore there needs be a size\r\n * limit for those initial messages that are sent immediately as part of the\r\n * GET handshake request. With sendRawJson=true, this limit is currently set\r\n * to 4K chars and data beyond this limit will be buffered till the handshake\r\n * (1-RTT) finishes. With sendRawJson=false, it's up to the application\r\n * to limit the amount of data that is sent as part of the handshake.\r\n *\r\n * disableRedact: whether to disable logging redact. By default, redact is\r\n * enabled to remove any message payload or user-provided info\r\n * from closure logs.\r\n *\r\n * clientProfile: inform the server about the client profile to enable\r\n * customized configs that are optimized for certain clients or environments.\r\n * Currently this information is sent via X-WebChannel-Client-Profile header.\r\n *\r\n * internalChannelParams: the internal channel parameter name to allow\r\n * experimental channel configurations. Supported options include fastfail,\r\n * baseRetryDelayMs, retryDelaySeedMs, forwardChannelMaxRetries and\r\n * forwardChannelRequestTimeoutMs. Note that these options are subject to\r\n * change.\r\n *\r\n * xmlHttpFactory: allows the caller to override the factory used to create\r\n * XMLHttpRequest objects. This is introduced to disable CORS on firefox OS.\r\n *\r\n * requestRefreshThresholds: client-side thresholds that decide when to refresh\r\n * an underlying HTTP request, to limit memory consumption due to XHR buffering\r\n * or compression context. The client-side thresholds should be signficantly\r\n * smaller than the server-side thresholds. This allows the client to eliminate\r\n * any latency introduced by request refreshing, i.e. an RTT window during which\r\n * messages may be buffered on the server-side. Supported params include\r\n * totalBytesReceived, totalDurationMs.\r\n *\r\n * @typedef {{\r\n *   messageHeaders: (!Object<string, string>|undefined),\r\n *   initMessageHeaders: (!Object<string, string>|undefined),\r\n *   messageContentType: (string|undefined),\r\n *   messageUrlParams: (!Object<string, string>|undefined),\r\n *   clientProtocolHeaderRequired: (boolean|undefined),\r\n *   concurrentRequestLimit: (number|undefined),\r\n *   supportsCrossDomainXhr: (boolean|undefined),\r\n *   testUrl: (string|undefined),\r\n *   sendRawJson: (boolean|undefined),\r\n *   httpSessionIdParam: (string|undefined),\r\n *   httpHeadersOverwriteParam: (string|undefined),\r\n *   backgroundChannelTest: (boolean|undefined),\r\n *   forceLongPolling: (boolean|undefined),\r\n *   fastHandshake: (boolean|undefined),\r\n *   disableRedact: (boolean|undefined),\r\n *   clientProfile: (string|undefined),\r\n *   internalChannelParams: (!Object<string, boolean|number>|undefined),\r\n *   xmlHttpFactory: (!goog.net.XmlHttpFactory|undefined),\r\n *   requestRefreshThresholds: (!Object<string, number>|undefined),\r\n * }}\r\n */\r\ngoog.net.WebChannel.Options;\r\n\r\n\r\n/**\r\n * Types that are allowed as message data.\r\n *\r\n * Note that JS objects (sent by the client) can only have string encoded\r\n * values due to the limitation of the current wire protocol.\r\n *\r\n * Unicode strings (sent by the server) may or may not need be escaped, as\r\n * decided by the server.\r\n *\r\n * @typedef {(!ArrayBuffer|!Blob|!Object<string, !Object|string>|!Array|string)}\r\n */\r\ngoog.net.WebChannel.MessageData;\r\n\r\n\r\n/**\r\n * Open the WebChannel against the URI specified in the constructor.\r\n */\r\ngoog.net.WebChannel.prototype.open = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * Close the WebChannel.\r\n *\r\n * This is a full close (shutdown) with no guarantee of FIFO delivery in respect\r\n * to any in-flight messages sent to the server.\r\n *\r\n * If you need such a guarantee, see the Half the halfClose() method.\r\n */\r\ngoog.net.WebChannel.prototype.close = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * Half-close the WebChannel.\r\n *\r\n * Half-close semantics:\r\n * 1. delivered as a regular message in FIFO programming order\r\n * 2. the server is expected to return a half-close too (with or without\r\n *    application involved), which will trigger a full close (shutdown)\r\n *    on the client side\r\n * 3. for now, the half-close event defined for server-initiated\r\n *    half-close is not exposed to the client application\r\n * 4. a client-side half-close may be triggered internally when the client\r\n *    receives a half-close from the server; and the client is expected to\r\n *    do a full close after the half-close is acked and delivered\r\n *    on the server-side.\r\n * 5. Full close is always a forced one. See the close() method.\r\n *\r\n * New messages sent after halfClose() will be dropped.\r\n *\r\n * NOTE: This is not yet implemented, and will throw an exception if called.\r\n */\r\ngoog.net.WebChannel.prototype.halfClose = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * Sends a message to the server that maintains the other end point of\r\n * the WebChannel.\r\n *\r\n * O-RTT behavior:\r\n * 1. messages sent before open() is called will always be delivered as\r\n *    part of the handshake, i.e. with 0-RTT\r\n * 2. messages sent after open() is called but before the OPEN event\r\n *    is received will be delivered as part of the handshake if\r\n *    send() is called from the same execution context as open().\r\n * 3. otherwise, those messages will be buffered till the handshake\r\n *    is completed (which will fire the OPEN event).\r\n *\r\n * @param {!goog.net.WebChannel.MessageData} message The message to send.\r\n */\r\ngoog.net.WebChannel.prototype.send = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * Common events fired by WebChannels.\r\n * @enum {string}\r\n */\r\ngoog.net.WebChannel.EventType = {\r\n  /** Dispatched when the channel is opened. */\r\n  OPEN: goog.events.getUniqueId('open'),\r\n\r\n  /** Dispatched when the channel is closed. */\r\n  CLOSE: goog.events.getUniqueId('close'),\r\n\r\n  /**\r\n   * Dispatched when the channel is aborted due to errors.\r\n   *\r\n   * For backward compatibility reasons, a CLOSE event will also be\r\n   * dispatched, following the ERROR event, which indicates that the channel\r\n   * has been completely shutdown .\r\n   */\r\n  ERROR: goog.events.getUniqueId('error'),\r\n\r\n  /** Dispatched when the channel has received a new message. */\r\n  MESSAGE: goog.events.getUniqueId('message')\r\n};\r\n\r\n\r\n\r\n/**\r\n * The event interface for the MESSAGE event.\r\n *\r\n * @constructor\r\n * @extends {goog.events.Event}\r\n */\r\ngoog.net.WebChannel.MessageEvent = function() {\r\n  goog.net.WebChannel.MessageEvent.base(\r\n      this, 'constructor', goog.net.WebChannel.EventType.MESSAGE);\r\n};\r\ngoog.inherits(goog.net.WebChannel.MessageEvent, goog.events.Event);\r\n\r\n\r\n/**\r\n * The content of the message received from the server.\r\n *\r\n * @type {!goog.net.WebChannel.MessageData}\r\n */\r\ngoog.net.WebChannel.MessageEvent.prototype.data;\r\n\r\n\r\n/**\r\n * The metadata key when the MESSAGE event represents a metadata message.\r\n *\r\n * @type {string|undefined}\r\n */\r\ngoog.net.WebChannel.MessageEvent.prototype.metadataKey;\r\n\r\n\r\n/**\r\n * WebChannel level error conditions.\r\n *\r\n * Summary of error debugging and reporting in WebChannel:\r\n *\r\n * Network Error\r\n * 1. By default the webchannel library will set the error status to\r\n *    NETWORK_ERROR when a channel has to be aborted or closed. NETWORK_ERROR\r\n *    may be recovered by the application by retrying and opening a new channel.\r\n * 2. There may be lost messages (not acked by the server) when a channel is\r\n *    aborted. Currently we don't have a public API to retrieve messages that\r\n *    are waiting to be acked on the client side. File a bug if you think it\r\n *    is useful to expose such an API.\r\n * 3. Details of why a channel fails are available via closure debug logs,\r\n *    and stats events (see webchannel/requeststats.js). Those are internal\r\n *    stats and are subject to change. File a bug if you think it's useful to\r\n *    version and expose such stats as part of the WebChannel API.\r\n *\r\n * Server Error\r\n * 1. SERVER_ERROR is intended to indicate a non-recoverable condition, e.g.\r\n *    when auth fails.\r\n * 2. We don't currently generate any such errors, because most of the time\r\n *    it's the responsibility of upper-layer frameworks or the application\r\n *    itself to indicate to the client why a webchannel has been failed\r\n *    by the server.\r\n * 3. When a channel is failed by the server explicitly, we still signal\r\n *    NETWORK_ERROR to the client. Explicit server failure may happen when the\r\n *    server does a fail-over, or becomes overloaded, or conducts a forced\r\n *    shutdown etc.\r\n * 4. We use some heuristic to decide if the network (aka cloud) is down\r\n *    v.s. the actual server is down.\r\n *\r\n *  RuntimeProperties.getLastStatusCode is a useful state that we expose to\r\n *  the client to indicate the HTTP response status code of the last HTTP\r\n *  request initiated by the WebChannel client library, for debugging\r\n *  purposes only.\r\n *\r\n *  See WebChannel.Options.backChannelFailureRecovery and\r\n *  WebChannel.FailureRecovery to install a custom failure-recovery algorithm.\r\n *\r\n * @enum {number}\r\n */\r\ngoog.net.WebChannel.ErrorStatus = {\r\n  /** No error has occurred. */\r\n  OK: 0,\r\n\r\n  /** Communication to the server has failed. */\r\n  NETWORK_ERROR: 1,\r\n\r\n  /** The server fails to accept or process the WebChannel. */\r\n  SERVER_ERROR: 2\r\n};\r\n\r\n\r\n\r\n/**\r\n * The event interface for the ERROR event.\r\n *\r\n * @constructor\r\n * @extends {goog.events.Event}\r\n */\r\ngoog.net.WebChannel.ErrorEvent = function() {\r\n  goog.net.WebChannel.ErrorEvent.base(\r\n      this, 'constructor', goog.net.WebChannel.EventType.ERROR);\r\n};\r\ngoog.inherits(goog.net.WebChannel.ErrorEvent, goog.events.Event);\r\n\r\n\r\n/**\r\n * The error status.\r\n *\r\n * @type {!goog.net.WebChannel.ErrorStatus}\r\n */\r\ngoog.net.WebChannel.ErrorEvent.prototype.status;\r\n\r\n\r\n/**\r\n * @return {!goog.net.WebChannel.RuntimeProperties} The runtime properties\r\n * of the WebChannel instance.\r\n */\r\ngoog.net.WebChannel.prototype.getRuntimeProperties = goog.abstractMethod;\r\n\r\n\r\n\r\n/**\r\n * The runtime properties of the WebChannel instance.\r\n *\r\n * This class is defined for debugging and monitoring purposes, as well as for\r\n * runtime functions that the application may choose to manage by itself.\r\n *\r\n * @interface\r\n */\r\ngoog.net.WebChannel.RuntimeProperties = function() {};\r\n\r\n\r\n/**\r\n * @return {number} The effective limit for the number of concurrent HTTP\r\n * requests that are allowed to be made for sending messages from the client\r\n * to the server. When SPDY is not enabled, this limit will be one.\r\n */\r\ngoog.net.WebChannel.RuntimeProperties.prototype.getConcurrentRequestLimit =\r\n    goog.abstractMethod;\r\n\r\n\r\n/**\r\n * For applications that need support multiple channels (e.g. from\r\n * different tabs) to the same origin, use this method to decide if SPDY is\r\n * enabled and therefore it is safe to open multiple channels.\r\n *\r\n * If SPDY is disabled, the application may choose to limit the number of active\r\n * channels to one or use other means such as sub-domains to work around\r\n * the browser connection limit.\r\n *\r\n * @return {boolean} Whether SPDY is enabled for the origin against which\r\n * the channel is created.\r\n */\r\ngoog.net.WebChannel.RuntimeProperties.prototype.isSpdyEnabled =\r\n    goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @return {number} The number of requests (for sending messages to the server)\r\n * that are pending. If this number is approaching the value of\r\n * getConcurrentRequestLimit(), client-to-server message delivery may experience\r\n * a higher latency.\r\n */\r\ngoog.net.WebChannel.RuntimeProperties.prototype.getPendingRequestCount =\r\n    goog.abstractMethod;\r\n\r\n\r\n/**\r\n * For applications to query the current HTTP session id, sent by the server\r\n * during the initial handshake.\r\n *\r\n * @return {?string} the HTTP session id or null if no HTTP session is in use.\r\n */\r\ngoog.net.WebChannel.RuntimeProperties.prototype.getHttpSessionId =\r\n    goog.abstractMethod;\r\n\r\n\r\n/**\r\n * Experimental API.\r\n *\r\n * This method generates an in-band commit request to the server, which will\r\n * ack the commit request as soon as all messages sent prior to this commit\r\n * request have been committed by the application.\r\n *\r\n * Committing a message has a stronger semantics than delivering a message\r\n * to the application. Detail spec:\r\n * https://github.com/bidiweb/webchannel/blob/master/commit.md\r\n *\r\n * Timeout or cancellation is not supported and the application is expected to\r\n * abort the channel if the commit-ack fails to arrive in time.\r\n *\r\n * ===\r\n *\r\n * This is currently implemented only in the client layer and the commit\r\n * callback will be invoked after all the pending client-sent messages have been\r\n * delivered by the server-side webchannel end-point. This semantics is\r\n * different and weaker than what's required for end-to-end ack which requires\r\n * the server application to ack the in-order delivery of messages that are sent\r\n * before the commit request is issued.\r\n *\r\n * Commit should only be called after the channel open event is received.\r\n * Duplicated commits are allowed and only the last callback is guaranteed.\r\n * Commit called after the channel has been closed will be ignored.\r\n *\r\n * @param {function()} callback The callback will be invoked once an\r\n * ack has been received for the current commit or any newly issued commit.\r\n */\r\ngoog.net.WebChannel.RuntimeProperties.prototype.commit = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * This method may be used by the application to recover from a peer failure\r\n * or to enable sender-initiated flow-control.\r\n *\r\n * Detail spec: https://github.com/bidiweb/webchannel/blob/master/commit.md\r\n *\r\n * This is not yet implemented.\r\n *\r\n * @return {number} The total number of messages that have not received\r\n * commit-ack from the server; or if no commit has been issued, the number\r\n * of messages that have not been delivered to the server application.\r\n */\r\ngoog.net.WebChannel.RuntimeProperties.prototype.getNonAckedMessageCount =\r\n    goog.abstractMethod;\r\n\r\n\r\n/**\r\n * A low water-mark message count to notify the application when the\r\n * flow-control condition is cleared, that is, when the application is\r\n * able to send more messages.\r\n *\r\n * We expect the application to configure a high water-mark message count,\r\n * which is checked via getNonAckedMessageCount(). When the high water-mark\r\n * is exceeded, the application should install a callback via this method\r\n * to be notified when to start to send new messages.\r\n *\r\n * This is not yet implemented.\r\n *\r\n * @param {number} count The low water-mark count. It is an error to pass\r\n * a non-positive value.\r\n * @param {function()} callback The call back to notify the application\r\n * when NonAckedMessageCount is below the specified low water-mark count.\r\n * Any previously registered callback is cleared. This new callback will\r\n * be cleared once it has been fired, or when the channel is closed or aborted.\r\n */\r\ngoog.net.WebChannel.RuntimeProperties.prototype.notifyNonAckedMessageCount =\r\n    goog.abstractMethod;\r\n\r\n\r\n/**\r\n * Experimental API.\r\n *\r\n * This method registers a callback to handle the commit request sent\r\n * by the server. Commit protocol spec:\r\n * https://github.com/bidiweb/webchannel/blob/master/commit.md\r\n *\r\n * This is not yet implemented.\r\n *\r\n * @param {function(!Object)} callback The callback will take an opaque\r\n * commitId which needs be passed back to the server when an ack-commit\r\n * response is generated by the client application, via ackCommit().\r\n */\r\ngoog.net.WebChannel.RuntimeProperties.prototype.onCommit = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * Experimental API.\r\n *\r\n * This method is used by the application to generate an ack-commit response\r\n * for the given commitId. Commit protocol spec:\r\n * https://github.com/bidiweb/webchannel/blob/master/commit.md\r\n *\r\n * This is not yet implemented.\r\n *\r\n * @param {!Object} commitId The commitId which denotes the commit request\r\n * from the server that needs be ack'ed.\r\n */\r\ngoog.net.WebChannel.RuntimeProperties.prototype.ackCommit = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @return {number} The last HTTP status code received by the channel.\r\n */\r\ngoog.net.WebChannel.RuntimeProperties.prototype.getLastStatusCode =\r\n    goog.abstractMethod;\r\n\r\n\r\n/**\r\n * Enum to indicate the current recovery state.\r\n *\r\n * @enum {string}\r\n */\r\ngoog.net.WebChannel.FailureRecovery.State = {\r\n  /** Initial state. */\r\n  INIT: 'init',\r\n\r\n  /** Once a failure has been detected. */\r\n  FAILED: 'failed',\r\n\r\n  /**\r\n   * Once a recovery operation has been issued, e.g. a new request to resume\r\n   * communication.\r\n   */\r\n  RECOVERING: 'recovering',\r\n\r\n  /** The channel has been closed.  */\r\n  CLOSED: 'closed'\r\n};\r\n\r\n\r\n/**\r\n * Enum to indicate different failure conditions as detected by the webchannel\r\n * runtime.\r\n *\r\n * This enum is to be used only between the runtime and FailureRecovery module,\r\n * and new states are expected to be introduced in future.\r\n *\r\n * @enum {string}\r\n */\r\ngoog.net.WebChannel.FailureRecovery.FailureCondition = {\r\n  /**\r\n   * The HTTP response returned a non-successful http status code.\r\n   */\r\n  HTTP_ERROR: 'http_error',\r\n\r\n  /**\r\n   * The request was aborted.\r\n   */\r\n  ABORT: 'abort',\r\n\r\n  /**\r\n   * The request timed out.\r\n   */\r\n  TIMEOUT: 'timeout',\r\n\r\n  /**\r\n   * Exception was thrown while processing the request/response.\r\n   */\r\n  EXCEPTION: 'exception'\r\n};\r\n\r\n\r\n/**\r\n * @return {!goog.net.WebChannel.FailureRecovery.State} the current state,\r\n * mainly for debugging use.\r\n */\r\ngoog.net.WebChannel.FailureRecovery.prototype.getState = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * This method is for WebChannel runtime to set the current failure condition\r\n * and to provide a callback for the algorithm to signal to the runtime\r\n * when it is time to issue a recovery operation, e.g. a new request to the\r\n * server.\r\n *\r\n * Supported transitions include:\r\n *   INIT->FAILED\r\n *   FAILED->FAILED (re-entry ok)\r\n *   RECOVERY->FAILED.\r\n *\r\n * Ignored if state == CLOSED.\r\n *\r\n * Advanced implementations are expected to track all the state transitions\r\n * and their timestamps for monitoring purposes.\r\n *\r\n * @param {!goog.net.WebChannel.FailureRecovery.FailureCondition} failure The\r\n * new failure condition generated by the WebChannel runtime.\r\n * @param {!Function} operation The callback function to the WebChannel\r\n * runtime to issue a recovery operation, e.g. a new request. E.g. the default\r\n * recovery algorithm will issue timeout-based recovery operations.\r\n * Post-condition for the callback: state transition to RECOVERING.\r\n *\r\n * @return {!goog.net.WebChannel.FailureRecovery.State} The updated state\r\n * as decided by the failure recovery module. Upon a recoverable failure event,\r\n * the state is transitioned to RECOVERING; or the state is transitioned to\r\n * FAILED which indicates a fail-fast decision for the runtime to execute.\r\n */\r\ngoog.net.WebChannel.FailureRecovery.prototype.setFailure = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * The Webchannel runtime needs call this method when webchannel is closed or\r\n * aborted.\r\n *\r\n * Once the instance is closed, any access to the instance will be a no-op.\r\n */\r\ngoog.net.WebChannel.FailureRecovery.prototype.close = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * A request header to indicate to the server the messaging protocol\r\n * each HTTP message is speaking.\r\n *\r\n * @type {string}\r\n */\r\ngoog.net.WebChannel.X_CLIENT_PROTOCOL = 'X-Client-Protocol';\r\n\r\n\r\n/**\r\n * The value for x-client-protocol when the messaging protocol is WebChannel.\r\n *\r\n * @type {string}\r\n */\r\ngoog.net.WebChannel.X_CLIENT_PROTOCOL_WEB_CHANNEL = 'webchannel';\r\n\r\n\r\n/**\r\n * A response header for the server to signal the wire-protocol that\r\n * the browser establishes with the server (or proxy), e.g. \"spdy\" (aka http/2)\r\n * \"quic\". This information avoids the need to use private APIs to decide if\r\n * HTTP requests are multiplexed etc.\r\n *\r\n * @type {string}\r\n */\r\ngoog.net.WebChannel.X_CLIENT_WIRE_PROTOCOL = 'X-Client-Wire-Protocol';\r\n\r\n\r\n/**\r\n * A response header for the server to send back the HTTP session id as part of\r\n * the initial handshake. The value of the HTTP session id is opaque to the\r\n * WebChannel protocol.\r\n *\r\n * @type {string}\r\n */\r\ngoog.net.WebChannel.X_HTTP_SESSION_ID = 'X-HTTP-Session-Id';\r\n\r\n\r\n/**\r\n * A response header for the server to send back any initial response data as a\r\n * header to avoid any possible buffering by an intermediary, which may\r\n * be undesired during the handshake.\r\n *\r\n * @type {string}\r\n */\r\ngoog.net.WebChannel.X_HTTP_INITIAL_RESPONSE = 'X-HTTP-Initial-Response';\r\n\r\n\r\n/**\r\n * A request header for specifying the content-type of WebChannel messages,\r\n * e.g. application-defined JSON encoding styles. Currently this header\r\n * is sent by the client via initMessageHeaders when the channel is opened.\r\n *\r\n * @type {string}\r\n */\r\ngoog.net.WebChannel.X_WEBCHANNEL_CONTENT_TYPE = 'X-WebChannel-Content-Type';\r\n\r\n\r\n/**\r\n * A request header for specifying the client profile in order to apply\r\n * customized config params on the server side, e.g. timeouts.\r\n *\r\n * @type {string}\r\n */\r\ngoog.net.WebChannel.X_WEBCHANNEL_CLIENT_PROFILE = 'X-WebChannel-Client-Profile';\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Definition of the ChannelRequest class. The request\r\n * object encapsulates the logic for making a single request, either for the\r\n * forward channel, back channel, or test channel, to the server. It contains\r\n * the logic for the two types of transports we use:\r\n * XMLHTTP and Image request. It provides timeout detection. More transports\r\n * to be added in future, such as Fetch, WebSocket.\r\n */\r\n\r\n\r\ngoog.provide('goog.labs.net.webChannel.ChannelRequest');\r\n\r\ngoog.require('goog.Timer');\r\ngoog.require('goog.async.Throttle');\r\ngoog.require('goog.events.EventHandler');\r\ngoog.require('goog.labs.net.webChannel.Channel');\r\ngoog.require('goog.labs.net.webChannel.WebChannelDebug');\r\ngoog.require('goog.labs.net.webChannel.environment');\r\ngoog.require('goog.labs.net.webChannel.requestStats');\r\ngoog.require('goog.net.ErrorCode');\r\ngoog.require('goog.net.EventType');\r\ngoog.require('goog.net.WebChannel');\r\ngoog.require('goog.net.XmlHttp');\r\ngoog.require('goog.object');\r\ngoog.require('goog.string');\r\ngoog.require('goog.userAgent');\r\n\r\ngoog.forwardDeclare('goog.Uri');\r\ngoog.forwardDeclare('goog.net.XhrIo');\r\n\r\n\r\n\r\n/**\r\n * A new ChannelRequest is created for each request to the server.\r\n *\r\n * @param {goog.labs.net.webChannel.Channel} channel\r\n *     The channel that owns this request.\r\n * @param {goog.labs.net.webChannel.WebChannelDebug} channelDebug A\r\n *     WebChannelDebug to use for logging.\r\n * @param {string=} opt_sessionId The session id for the channel.\r\n * @param {string|number=} opt_requestId The request id for this request.\r\n * @param {number=} opt_retryId The retry id for this request.\r\n * @constructor\r\n * @struct\r\n * @final\r\n */\r\ngoog.labs.net.webChannel.ChannelRequest = function(\r\n    channel, channelDebug, opt_sessionId, opt_requestId, opt_retryId) {\r\n  /**\r\n   * The channel object that owns the request.\r\n   * @private {goog.labs.net.webChannel.Channel}\r\n   */\r\n  this.channel_ = channel;\r\n\r\n  /**\r\n   * The channel debug to use for logging\r\n   * @private {goog.labs.net.webChannel.WebChannelDebug}\r\n   */\r\n  this.channelDebug_ = channelDebug;\r\n\r\n  /**\r\n   * The Session ID for the channel.\r\n   * @private {string|undefined}\r\n   */\r\n  this.sid_ = opt_sessionId;\r\n\r\n  /**\r\n   * The RID (request ID) for the request.\r\n   * @private {string|number|undefined}\r\n   */\r\n  this.rid_ = opt_requestId;\r\n\r\n  /**\r\n   * The attempt number of the current request.\r\n   * @private {number}\r\n   */\r\n  this.retryId_ = opt_retryId || 1;\r\n\r\n  /**\r\n   * An object to keep track of the channel request event listeners.\r\n   * @private {!goog.events.EventHandler<\r\n   *     !goog.labs.net.webChannel.ChannelRequest>}\r\n   */\r\n  this.eventHandler_ = new goog.events.EventHandler(this);\r\n\r\n  /**\r\n   * The timeout in ms before failing the request.\r\n   * @private {number}\r\n   */\r\n  this.timeout_ = goog.labs.net.webChannel.ChannelRequest.TIMEOUT_MS_;\r\n\r\n  /**\r\n   * A timer for polling responseText in browsers that don't fire\r\n   * onreadystatechange during incremental loading of responseText.\r\n   * @private {goog.Timer}\r\n   */\r\n  this.pollingTimer_ =\r\n      new goog.Timer(goog.labs.net.webChannel.environment.getPollingInterval());\r\n\r\n  /**\r\n   * Extra HTTP headers to add to all the requests sent to the server.\r\n   * @private {Object}\r\n   */\r\n  this.extraHeaders_ = null;\r\n\r\n\r\n  /**\r\n   * Whether the request was successful. This is only set to true after the\r\n   * request successfully completes.\r\n   * @private {boolean}\r\n   */\r\n  this.successful_ = false;\r\n\r\n\r\n  /**\r\n   * The TimerID of the timer used to detect if the request has timed-out.\r\n   * @type {?number}\r\n   * @private\r\n   */\r\n  this.watchDogTimerId_ = null;\r\n\r\n  /**\r\n   * The time in the future when the request will timeout.\r\n   * @private {?number}\r\n   */\r\n  this.watchDogTimeoutTime_ = null;\r\n\r\n  /**\r\n   * The time the request started.\r\n   * @private {?number}\r\n   */\r\n  this.requestStartTime_ = null;\r\n\r\n  /**\r\n   * The type of request (XMLHTTP, IMG)\r\n   * @private {?number}\r\n   */\r\n  this.type_ = null;\r\n\r\n  /**\r\n   * The base Uri for the request. The includes all the parameters except the\r\n   * one that indicates the retry number.\r\n   * @private {goog.Uri}\r\n   */\r\n  this.baseUri_ = null;\r\n\r\n  /**\r\n   * The request Uri that was actually used for the most recent request attempt.\r\n   * @private {goog.Uri}\r\n   */\r\n  this.requestUri_ = null;\r\n\r\n  /**\r\n   * The post data, if the request is a post.\r\n   * @private {?string}\r\n   */\r\n  this.postData_ = null;\r\n\r\n  /**\r\n   * An array of pending messages that we have either received a non-successful\r\n   * response for, or no response at all, and which therefore may or may not\r\n   * have been received by the server.\r\n   * @private {!Array<goog.labs.net.webChannel.Wire.QueuedMap>}\r\n   */\r\n  this.pendingMessages_ = [];\r\n\r\n  /**\r\n   * The XhrLte request if the request is using XMLHTTP\r\n   * @private {goog.net.XhrIo}\r\n   */\r\n  this.xmlHttp_ = null;\r\n\r\n  /**\r\n   * The position of where the next unprocessed chunk starts in the response\r\n   * text.\r\n   * @private {number}\r\n   */\r\n  this.xmlHttpChunkStart_ = 0;\r\n\r\n  /**\r\n   * The verb (Get or Post) for the request.\r\n   * @private {?string}\r\n   */\r\n  this.verb_ = null;\r\n\r\n  /**\r\n   * The last error if the request failed.\r\n   * @private {?goog.labs.net.webChannel.ChannelRequest.Error}\r\n   */\r\n  this.lastError_ = null;\r\n\r\n  /**\r\n   * The last status code received.\r\n   * @private {number}\r\n   */\r\n  this.lastStatusCode_ = -1;\r\n\r\n  /**\r\n   * Whether the request has been cancelled due to a call to cancel.\r\n   * @private {boolean}\r\n   */\r\n  this.cancelled_ = false;\r\n\r\n  /**\r\n   * A throttle time in ms for readystatechange events for the backchannel.\r\n   * Useful for throttling when ready state is INTERACTIVE (partial data).\r\n   * If set to zero no throttle is used.\r\n   *\r\n   * See WebChannelBase.prototype.readyStateChangeThrottleMs_\r\n   *\r\n   * @private {number}\r\n   */\r\n  this.readyStateChangeThrottleMs_ = 0;\r\n\r\n  /**\r\n   * The throttle for readystatechange events for the current request, or null\r\n   * if there is none.\r\n   * @private {goog.async.Throttle}\r\n   */\r\n  this.readyStateChangeThrottle_ = null;\r\n\r\n  /**\r\n   * Whether to the result is expected to be encoded for chunking and thus\r\n   * requires decoding.\r\n   * @private {boolean}\r\n   */\r\n  this.decodeChunks_ = false;\r\n\r\n  /**\r\n   * Whether to decode x-http-initial-response.\r\n   * @private {boolean}\r\n   */\r\n  this.decodeInitialResponse_ = false;\r\n\r\n  /**\r\n   * Whether x-http-initial-response has been decoded (dispatched).\r\n   * @private {boolean}\r\n   */\r\n  this.initialResponseDecoded_ = false;\r\n};\r\n\r\n\r\ngoog.scope(function() {\r\nvar WebChannel = goog.net.WebChannel;\r\nvar Channel = goog.labs.net.webChannel.Channel;\r\nvar ChannelRequest = goog.labs.net.webChannel.ChannelRequest;\r\nvar requestStats = goog.labs.net.webChannel.requestStats;\r\nvar WebChannelDebug = goog.labs.net.webChannel.WebChannelDebug;\r\nvar environment = goog.labs.net.webChannel.environment;\r\n\r\n\r\n/**\r\n * Default timeout in MS for a request. The server must return data within this\r\n * time limit for the request to not timeout.\r\n * @private {number}\r\n */\r\nChannelRequest.TIMEOUT_MS_ = 45 * 1000;\r\n\r\n\r\n/**\r\n * Enum for channel requests type\r\n * @enum {number}\r\n * @private\r\n */\r\nChannelRequest.Type_ = {\r\n  /**\r\n   * XMLHTTP requests.\r\n   */\r\n  XML_HTTP: 1,\r\n\r\n  /**\r\n   * IMG requests.\r\n   */\r\n  CLOSE_REQUEST: 2\r\n};\r\n\r\n\r\n/**\r\n * Enum type for identifying an error.\r\n * @enum {number}\r\n */\r\nChannelRequest.Error = {\r\n  /**\r\n   * Errors due to a non-200 status code.\r\n   */\r\n  STATUS: 0,\r\n\r\n  /**\r\n   * Errors due to no data being returned.\r\n   */\r\n  NO_DATA: 1,\r\n\r\n  /**\r\n   * Errors due to a timeout.\r\n   */\r\n  TIMEOUT: 2,\r\n\r\n  /**\r\n   * Errors due to the server returning an unknown.\r\n   */\r\n  UNKNOWN_SESSION_ID: 3,\r\n\r\n  /**\r\n   * Errors due to bad data being received.\r\n   */\r\n  BAD_DATA: 4,\r\n\r\n  /**\r\n   * Errors due to the handler throwing an exception.\r\n   */\r\n  HANDLER_EXCEPTION: 5,\r\n\r\n  /**\r\n   * The browser declared itself offline during the request.\r\n   */\r\n  BROWSER_OFFLINE: 6\r\n};\r\n\r\n\r\n/**\r\n * Returns a useful error string for debugging based on the specified error\r\n * code.\r\n * @param {?ChannelRequest.Error} errorCode The error code.\r\n * @param {number} statusCode The HTTP status code.\r\n * @return {string} The error string for the given code combination.\r\n */\r\nChannelRequest.errorStringFromCode = function(errorCode, statusCode) {\r\n  switch (errorCode) {\r\n    case ChannelRequest.Error.STATUS:\r\n      return 'Non-200 return code (' + statusCode + ')';\r\n    case ChannelRequest.Error.NO_DATA:\r\n      return 'XMLHTTP failure (no data)';\r\n    case ChannelRequest.Error.TIMEOUT:\r\n      return 'HttpConnection timeout';\r\n    default:\r\n      return 'Unknown error';\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Sentinel value used to indicate an invalid chunk in a multi-chunk response.\r\n * @private {Object}\r\n */\r\nChannelRequest.INVALID_CHUNK_ = {};\r\n\r\n\r\n/**\r\n * Sentinel value used to indicate an incomplete chunk in a multi-chunk\r\n * response.\r\n * @private {Object}\r\n */\r\nChannelRequest.INCOMPLETE_CHUNK_ = {};\r\n\r\n\r\n/**\r\n * Returns whether XHR streaming is supported on this browser.\r\n *\r\n * @return {boolean} Whether XHR streaming is supported.\r\n * @see http://code.google.com/p/closure-library/issues/detail?id=346\r\n */\r\nChannelRequest.supportsXhrStreaming = function() {\r\n  return !goog.userAgent.IE || goog.userAgent.isDocumentModeOrHigher(10);\r\n};\r\n\r\n\r\n/**\r\n * Sets extra HTTP headers to add to all the requests sent to the server.\r\n *\r\n * @param {Object} extraHeaders The HTTP headers.\r\n */\r\nChannelRequest.prototype.setExtraHeaders = function(extraHeaders) {\r\n  this.extraHeaders_ = extraHeaders;\r\n};\r\n\r\n\r\n/**\r\n * Overrides the default HTTP method.\r\n *\r\n * @param {string} verb The HTTP method\r\n */\r\nChannelRequest.prototype.setVerb = function(verb) {\r\n  this.verb_ = verb;\r\n};\r\n\r\n\r\n/**\r\n * Sets the timeout for a request\r\n *\r\n * @param {number} timeout   The timeout in MS for when we fail the request.\r\n */\r\nChannelRequest.prototype.setTimeout = function(timeout) {\r\n  this.timeout_ = timeout;\r\n};\r\n\r\n\r\n/**\r\n * Sets the throttle for handling onreadystatechange events for the request.\r\n *\r\n * @param {number} throttle The throttle in ms.  A value of zero indicates\r\n *     no throttle.\r\n */\r\nChannelRequest.prototype.setReadyStateChangeThrottle = function(throttle) {\r\n  this.readyStateChangeThrottleMs_ = throttle;\r\n};\r\n\r\n\r\n/**\r\n * Sets the pending messages that this request is handling.\r\n *\r\n * @param {!Array<goog.labs.net.webChannel.Wire.QueuedMap>} pendingMessages\r\n *     The pending messages for this request.\r\n */\r\nChannelRequest.prototype.setPendingMessages = function(pendingMessages) {\r\n  this.pendingMessages_ = pendingMessages;\r\n};\r\n\r\n\r\n/**\r\n * Gets the pending messages that this request is handling, in case of a retry.\r\n *\r\n * @return {!Array<goog.labs.net.webChannel.Wire.QueuedMap>} The pending\r\n *     messages for this request.\r\n */\r\nChannelRequest.prototype.getPendingMessages = function() {\r\n  return this.pendingMessages_;\r\n};\r\n\r\n\r\n/**\r\n * Uses XMLHTTP to send an HTTP POST to the server.\r\n *\r\n * @param {goog.Uri} uri  The uri of the request.\r\n * @param {?string} postData  The data for the post body.\r\n * @param {boolean} decodeChunks  Whether to the result is expected to be\r\n *     encoded for chunking and thus requires decoding.\r\n */\r\nChannelRequest.prototype.xmlHttpPost = function(uri, postData, decodeChunks) {\r\n  this.type_ = ChannelRequest.Type_.XML_HTTP;\r\n  this.baseUri_ = uri.clone().makeUnique();\r\n  this.postData_ = postData;\r\n  this.decodeChunks_ = decodeChunks;\r\n  this.sendXmlHttp_(null /* hostPrefix */);\r\n};\r\n\r\n\r\n/**\r\n * Uses XMLHTTP to send an HTTP GET to the server.\r\n *\r\n * @param {goog.Uri} uri  The uri of the request.\r\n * @param {boolean} decodeChunks  Whether to the result is expected to be\r\n *     encoded for chunking and thus requires decoding.\r\n * @param {?string} hostPrefix  The host prefix, if we might be using a\r\n *     secondary domain.  Note that it should also be in the URL, adding this\r\n *     won't cause it to be added to the URL.\r\n */\r\nChannelRequest.prototype.xmlHttpGet = function(uri, decodeChunks, hostPrefix) {\r\n  this.type_ = ChannelRequest.Type_.XML_HTTP;\r\n  this.baseUri_ = uri.clone().makeUnique();\r\n  this.postData_ = null;\r\n  this.decodeChunks_ = decodeChunks;\r\n\r\n  this.sendXmlHttp_(hostPrefix);\r\n};\r\n\r\n\r\n/**\r\n * Sends a request via XMLHTTP according to the current state of the request\r\n * object.\r\n *\r\n * @param {?string} hostPrefix The host prefix, if we might be using a secondary\r\n *     domain.\r\n * @private\r\n */\r\nChannelRequest.prototype.sendXmlHttp_ = function(hostPrefix) {\r\n  this.requestStartTime_ = goog.now();\r\n  this.ensureWatchDogTimer_();\r\n\r\n  // clone the base URI to create the request URI. The request uri has the\r\n  // attempt number as a parameter which helps in debugging.\r\n  this.requestUri_ = this.baseUri_.clone();\r\n  this.requestUri_.setParameterValues('t', this.retryId_);\r\n\r\n  // send the request either as a POST or GET\r\n  this.xmlHttpChunkStart_ = 0;\r\n  var useSecondaryDomains = this.channel_.shouldUseSecondaryDomains();\r\n  this.xmlHttp_ =\r\n      this.channel_.createXhrIo(useSecondaryDomains ? hostPrefix : null);\r\n\r\n  if (this.readyStateChangeThrottleMs_ > 0) {\r\n    this.readyStateChangeThrottle_ = new goog.async.Throttle(\r\n        goog.bind(this.xmlHttpHandler_, this, this.xmlHttp_),\r\n        this.readyStateChangeThrottleMs_);\r\n  }\r\n\r\n  this.eventHandler_.listen(\r\n      this.xmlHttp_, goog.net.EventType.READY_STATE_CHANGE,\r\n      this.readyStateChangeHandler_);\r\n\r\n  var headers = this.extraHeaders_ ? goog.object.clone(this.extraHeaders_) : {};\r\n  if (this.postData_) {\r\n    if (!this.verb_) {\r\n      this.verb_ = 'POST';\r\n    }\r\n    headers['Content-Type'] = 'application/x-www-form-urlencoded';\r\n    this.xmlHttp_.send(this.requestUri_, this.verb_, this.postData_, headers);\r\n  } else {\r\n    this.verb_ = 'GET';\r\n    this.xmlHttp_.send(this.requestUri_, this.verb_, null, headers);\r\n  }\r\n  requestStats.notifyServerReachabilityEvent(\r\n      requestStats.ServerReachability.REQUEST_MADE);\r\n  this.channelDebug_.xmlHttpChannelRequest(\r\n      this.verb_, this.requestUri_, this.rid_, this.retryId_, this.postData_);\r\n};\r\n\r\n\r\n/**\r\n * Handles a readystatechange event.\r\n * @param {goog.events.Event} evt The event.\r\n * @private\r\n */\r\nChannelRequest.prototype.readyStateChangeHandler_ = function(evt) {\r\n  var xhr = /** @type {goog.net.XhrIo} */ (evt.target);\r\n  var throttle = this.readyStateChangeThrottle_;\r\n  if (throttle &&\r\n      xhr.getReadyState() == goog.net.XmlHttp.ReadyState.INTERACTIVE) {\r\n    // Only throttle in the partial data case.\r\n    this.channelDebug_.debug('Throttling readystatechange.');\r\n    throttle.fire();\r\n  } else {\r\n    // If we haven't throttled, just handle response directly.\r\n    this.xmlHttpHandler_(xhr);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * XmlHttp handler\r\n * @param {goog.net.XhrIo} xmlhttp The XhrIo object for the current request.\r\n * @private\r\n */\r\nChannelRequest.prototype.xmlHttpHandler_ = function(xmlhttp) {\r\n  requestStats.onStartExecution();\r\n\r\n\r\n  try {\r\n    if (xmlhttp == this.xmlHttp_) {\r\n      this.onXmlHttpReadyStateChanged_();\r\n    } else {\r\n      this.channelDebug_.warning(\r\n          'Called back with an ' +\r\n          'unexpected xmlhttp');\r\n    }\r\n  } catch (ex) {\r\n    this.channelDebug_.debug('Failed call to OnXmlHttpReadyStateChanged_');\r\n    if (this.xmlHttp_ && this.xmlHttp_.getResponseText()) {\r\n      var channelRequest = this;\r\n      this.channelDebug_.dumpException(ex, function() {\r\n        return 'ResponseText: ' + channelRequest.xmlHttp_.getResponseText();\r\n      });\r\n    } else {\r\n      this.channelDebug_.dumpException(ex, 'No response text');\r\n    }\r\n  } finally {\r\n    requestStats.onEndExecution();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Called by the readystate handler for XMLHTTP requests.\r\n *\r\n * @private\r\n */\r\nChannelRequest.prototype.onXmlHttpReadyStateChanged_ = function() {\r\n  var readyState = this.xmlHttp_.getReadyState();\r\n  var errorCode = this.xmlHttp_.getLastErrorCode();\r\n  var statusCode = this.xmlHttp_.getStatus();\r\n\r\n  // we get partial results in browsers that support ready state interactive.\r\n  // We also make sure that getResponseText is not null in interactive mode\r\n  // before we continue.\r\n  if (readyState < goog.net.XmlHttp.ReadyState.INTERACTIVE ||\r\n      (readyState == goog.net.XmlHttp.ReadyState.INTERACTIVE &&\r\n       !environment.isPollingRequired() &&  // otherwise, go on to startPolling\r\n       !this.xmlHttp_.getResponseText())) {\r\n    return;  // not yet ready\r\n  }\r\n\r\n  // Dispatch any appropriate network events.\r\n  if (!this.cancelled_ && readyState == goog.net.XmlHttp.ReadyState.COMPLETE &&\r\n      errorCode != goog.net.ErrorCode.ABORT) {\r\n    // Pretty conservative, these are the only known scenarios which we'd\r\n    // consider indicative of a truly non-functional network connection.\r\n    if (errorCode == goog.net.ErrorCode.TIMEOUT || statusCode <= 0) {\r\n      requestStats.notifyServerReachabilityEvent(\r\n          requestStats.ServerReachability.REQUEST_FAILED);\r\n    } else {\r\n      requestStats.notifyServerReachabilityEvent(\r\n          requestStats.ServerReachability.REQUEST_SUCCEEDED);\r\n    }\r\n  }\r\n\r\n  // got some data so cancel the watchdog timer\r\n  this.cancelWatchDogTimer_();\r\n\r\n  var status = this.xmlHttp_.getStatus();\r\n  this.lastStatusCode_ = status;\r\n  var responseText = this.xmlHttp_.getResponseText();\r\n  if (!responseText) {\r\n    var channelRequest = this;\r\n    this.channelDebug_.debug(function() {\r\n      return 'No response text for uri ' + channelRequest.requestUri_ +\r\n          ' status ' + status;\r\n    });\r\n  }\r\n  this.successful_ = (status == 200);\r\n\r\n  this.channelDebug_.xmlHttpChannelResponseMetaData(\r\n      /** @type {string} */ (this.verb_), this.requestUri_, this.rid_,\r\n      this.retryId_, readyState, status);\r\n\r\n  if (!this.successful_) {\r\n    if (status == 400 && responseText.indexOf('Unknown SID') > 0) {\r\n      // the server error string will include 'Unknown SID' which indicates the\r\n      // server doesn't know about the session (maybe it got restarted, maybe\r\n      // the user got moved to another server, etc.,). Handlers can special\r\n      // case this error\r\n      this.lastError_ = ChannelRequest.Error.UNKNOWN_SESSION_ID;\r\n      requestStats.notifyStatEvent(\r\n          requestStats.Stat.REQUEST_UNKNOWN_SESSION_ID);\r\n      this.channelDebug_.warning('XMLHTTP Unknown SID (' + this.rid_ + ')');\r\n    } else {\r\n      this.lastError_ = ChannelRequest.Error.STATUS;\r\n      requestStats.notifyStatEvent(requestStats.Stat.REQUEST_BAD_STATUS);\r\n      this.channelDebug_.warning(\r\n          'XMLHTTP Bad status ' + status + ' (' + this.rid_ + ')');\r\n    }\r\n    this.cleanup_();\r\n    this.dispatchFailure_();\r\n    return;\r\n  }\r\n\r\n  if (this.shouldCheckInitialResponse_()) {\r\n    var initialResponse = this.getInitialResponse_();\r\n    if (initialResponse) {\r\n      this.channelDebug_.xmlHttpChannelResponseText(\r\n          this.rid_, initialResponse,\r\n          'Initial handshake response via ' +\r\n              WebChannel.X_HTTP_INITIAL_RESPONSE);\r\n      this.initialResponseDecoded_ = true;\r\n      this.safeOnRequestData_(initialResponse);\r\n    } else {\r\n      this.successful_ = false;\r\n      this.lastError_ = ChannelRequest.Error.UNKNOWN_SESSION_ID;  // fail-fast\r\n      requestStats.notifyStatEvent(\r\n          requestStats.Stat.REQUEST_UNKNOWN_SESSION_ID);\r\n      this.channelDebug_.warning(\r\n          'XMLHTTP Missing X_HTTP_INITIAL_RESPONSE' +\r\n          ' (' + this.rid_ + ')');\r\n      this.cleanup_();\r\n      this.dispatchFailure_();\r\n      return;\r\n    }\r\n  }\r\n\r\n  if (this.decodeChunks_) {\r\n    this.decodeNextChunks_(readyState, responseText);\r\n    if (environment.isPollingRequired() && this.successful_ &&\r\n        readyState == goog.net.XmlHttp.ReadyState.INTERACTIVE) {\r\n      this.startPolling_();\r\n    }\r\n  } else {\r\n    this.channelDebug_.xmlHttpChannelResponseText(\r\n        this.rid_, responseText, null);\r\n    this.safeOnRequestData_(responseText);\r\n  }\r\n\r\n  if (readyState == goog.net.XmlHttp.ReadyState.COMPLETE) {\r\n    this.cleanup_();\r\n  }\r\n\r\n  if (!this.successful_) {\r\n    return;\r\n  }\r\n\r\n  if (!this.cancelled_) {\r\n    if (readyState == goog.net.XmlHttp.ReadyState.COMPLETE) {\r\n      this.channel_.onRequestComplete(this);\r\n    } else {\r\n      // The default is false, the result from this callback shouldn't carry\r\n      // over to the next callback, otherwise the request looks successful if\r\n      // the watchdog timer gets called\r\n      this.successful_ = false;\r\n      this.ensureWatchDogTimer_();\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Whether we need check the initial-response header that is sent during the\r\n * fast handshake.\r\n *\r\n * @return {boolean} true if the initial-response header is yet to be processed.\r\n * @private\r\n */\r\nChannelRequest.prototype.shouldCheckInitialResponse_ = function() {\r\n  return this.decodeInitialResponse_ && !this.initialResponseDecoded_;\r\n};\r\n\r\n\r\n/**\r\n * Queries the initial response header that is sent during the handshake.\r\n *\r\n * @return {?string} The non-empty header value or null.\r\n * @private\r\n */\r\nChannelRequest.prototype.getInitialResponse_ = function() {\r\n  if (this.xmlHttp_) {\r\n    var value = this.xmlHttp_.getStreamingResponseHeader(\r\n        WebChannel.X_HTTP_INITIAL_RESPONSE);\r\n    if (value && !goog.string.isEmptyOrWhitespace(value)) {\r\n      return value;\r\n    }\r\n  }\r\n\r\n  return null;\r\n};\r\n\r\n\r\n/**\r\n * Check if the initial response header has been handled.\r\n *\r\n * @return {boolean} true if X_HTTP_INITIAL_RESPONSE has been handled.\r\n */\r\nChannelRequest.prototype.isInitialResponseDecoded = function() {\r\n  return this.initialResponseDecoded_;\r\n};\r\n\r\n\r\n/**\r\n * Decodes X_HTTP_INITIAL_RESPONSE if present.\r\n */\r\nChannelRequest.prototype.setDecodeInitialResponse = function() {\r\n  this.decodeInitialResponse_ = true;\r\n};\r\n\r\n\r\n/**\r\n * Decodes the next set of available chunks in the response.\r\n * @param {number} readyState The value of readyState.\r\n * @param {string} responseText The value of responseText.\r\n * @private\r\n */\r\nChannelRequest.prototype.decodeNextChunks_ = function(\r\n    readyState, responseText) {\r\n  var decodeNextChunksSuccessful = true;\r\n  while (!this.cancelled_ && this.xmlHttpChunkStart_ < responseText.length) {\r\n    var chunkText = this.getNextChunk_(responseText);\r\n    if (chunkText == ChannelRequest.INCOMPLETE_CHUNK_) {\r\n      if (readyState == goog.net.XmlHttp.ReadyState.COMPLETE) {\r\n        // should have consumed entire response when the request is done\r\n        this.lastError_ = ChannelRequest.Error.BAD_DATA;\r\n        requestStats.notifyStatEvent(requestStats.Stat.REQUEST_INCOMPLETE_DATA);\r\n        decodeNextChunksSuccessful = false;\r\n      }\r\n      this.channelDebug_.xmlHttpChannelResponseText(\r\n          this.rid_, null, '[Incomplete Response]');\r\n      break;\r\n    } else if (chunkText == ChannelRequest.INVALID_CHUNK_) {\r\n      this.lastError_ = ChannelRequest.Error.BAD_DATA;\r\n      requestStats.notifyStatEvent(requestStats.Stat.REQUEST_BAD_DATA);\r\n      this.channelDebug_.xmlHttpChannelResponseText(\r\n          this.rid_, responseText, '[Invalid Chunk]');\r\n      decodeNextChunksSuccessful = false;\r\n      break;\r\n    } else {\r\n      this.channelDebug_.xmlHttpChannelResponseText(\r\n          this.rid_, /** @type {string} */ (chunkText), null);\r\n      this.safeOnRequestData_(/** @type {string} */ (chunkText));\r\n    }\r\n  }\r\n  if (readyState == goog.net.XmlHttp.ReadyState.COMPLETE &&\r\n      responseText.length == 0) {\r\n    // also an error if we didn't get any response\r\n    this.lastError_ = ChannelRequest.Error.NO_DATA;\r\n    requestStats.notifyStatEvent(requestStats.Stat.REQUEST_NO_DATA);\r\n    decodeNextChunksSuccessful = false;\r\n  }\r\n  this.successful_ = this.successful_ && decodeNextChunksSuccessful;\r\n  if (!decodeNextChunksSuccessful) {\r\n    // malformed response - we make this trigger retry logic\r\n    this.channelDebug_.xmlHttpChannelResponseText(\r\n        this.rid_, responseText, '[Invalid Chunked Response]');\r\n    this.cleanup_();\r\n    this.dispatchFailure_();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Polls the response for new data.\r\n * @private\r\n */\r\nChannelRequest.prototype.pollResponse_ = function() {\r\n  if (!this.xmlHttp_) {\r\n    return;  // already closed\r\n  }\r\n  var readyState = this.xmlHttp_.getReadyState();\r\n  var responseText = this.xmlHttp_.getResponseText();\r\n  if (this.xmlHttpChunkStart_ < responseText.length) {\r\n    this.cancelWatchDogTimer_();\r\n    this.decodeNextChunks_(readyState, responseText);\r\n    if (this.successful_ &&\r\n        readyState != goog.net.XmlHttp.ReadyState.COMPLETE) {\r\n      this.ensureWatchDogTimer_();\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Starts a polling interval for changes to responseText of the\r\n * XMLHttpRequest, for browsers that don't fire onreadystatechange\r\n * as data comes in incrementally.  This timer is disabled in\r\n * cleanup_().\r\n * @private\r\n */\r\nChannelRequest.prototype.startPolling_ = function() {\r\n  this.eventHandler_.listen(\r\n      this.pollingTimer_, goog.Timer.TICK, this.pollResponse_);\r\n  this.pollingTimer_.start();\r\n};\r\n\r\n\r\n/**\r\n * Returns the next chunk of a chunk-encoded response. This is not standard\r\n * HTTP chunked encoding because browsers don't expose the chunk boundaries to\r\n * the application through XMLHTTP. So we have an additional chunk encoding at\r\n * the application level that lets us tell where the beginning and end of\r\n * individual responses are so that we can only try to eval a complete JS array.\r\n *\r\n * The encoding is the size of the chunk encoded as a decimal string followed\r\n * by a newline followed by the data.\r\n *\r\n * @param {string} responseText The response text from the XMLHTTP response.\r\n * @return {string|Object} The next chunk string or a sentinel object\r\n *                         indicating a special condition.\r\n * @private\r\n */\r\nChannelRequest.prototype.getNextChunk_ = function(responseText) {\r\n  var sizeStartIndex = this.xmlHttpChunkStart_;\r\n  var sizeEndIndex = responseText.indexOf('\\n', sizeStartIndex);\r\n  if (sizeEndIndex == -1) {\r\n    return ChannelRequest.INCOMPLETE_CHUNK_;\r\n  }\r\n\r\n  var sizeAsString = responseText.substring(sizeStartIndex, sizeEndIndex);\r\n  var size = Number(sizeAsString);\r\n  if (isNaN(size)) {\r\n    return ChannelRequest.INVALID_CHUNK_;\r\n  }\r\n\r\n  var chunkStartIndex = sizeEndIndex + 1;\r\n  if (chunkStartIndex + size > responseText.length) {\r\n    return ChannelRequest.INCOMPLETE_CHUNK_;\r\n  }\r\n\r\n  var chunkText = responseText.substr(chunkStartIndex, size);\r\n  this.xmlHttpChunkStart_ = chunkStartIndex + size;\r\n  return chunkText;\r\n};\r\n\r\n\r\n/**\r\n * Uses an IMG tag or navigator.sendBeacon to send an HTTP get to the server.\r\n *\r\n * This is only currently used to terminate the connection, as an IMG tag is\r\n * the most reliable way to send something to the server while the page\r\n * is getting torn down.\r\n *\r\n * Navigator.sendBeacon is available on Chrome and Firefox as a formal\r\n * solution to ensure delivery without blocking window close. See\r\n * https://developer.mozilla.org/en-US/docs/Web/API/Navigator/sendBeacon\r\n *\r\n * For Chrome Apps, sendBeacon is always necessary due to Content Security\r\n * Policy (CSP) violation of using an IMG tag.\r\n *\r\n * For react-native, we use xhr to send the actual close request, and assume\r\n * there is no page-close issue with react-native.\r\n *\r\n * @param {goog.Uri} uri The uri to send a request to.\r\n */\r\nChannelRequest.prototype.sendCloseRequest = function(uri) {\r\n  this.type_ = ChannelRequest.Type_.CLOSE_REQUEST;\r\n  this.baseUri_ = uri.clone().makeUnique();\r\n\r\n  var requestSent = false;\r\n\r\n  if (goog.global.navigator && goog.global.navigator.sendBeacon) {\r\n    // empty string body to avoid 413 error on chrome < 41\r\n    requestSent =\r\n        goog.global.navigator.sendBeacon(this.baseUri_.toString(), '');\r\n  }\r\n\r\n  if (!requestSent && goog.global.Image) {\r\n    var eltImg = new Image();\r\n    eltImg.src = this.baseUri_;\r\n    requestSent = true;\r\n  }\r\n\r\n  if (!requestSent) {\r\n    // no handler is set to match the sendBeacon/Image behavior\r\n    this.xmlHttp_ = this.channel_.createXhrIo(null);\r\n    this.xmlHttp_.send(this.baseUri_);\r\n  }\r\n\r\n  this.requestStartTime_ = goog.now();\r\n  this.ensureWatchDogTimer_();\r\n};\r\n\r\n\r\n/**\r\n * Cancels the request no matter what the underlying transport is.\r\n */\r\nChannelRequest.prototype.cancel = function() {\r\n  this.cancelled_ = true;\r\n  this.cleanup_();\r\n};\r\n\r\n\r\n/**\r\n * Resets the timeout.\r\n *\r\n * @param {number=} opt_timeout The new timeout\r\n */\r\nChannelRequest.prototype.resetTimeout = function(opt_timeout) {\r\n  if (opt_timeout) {\r\n    this.setTimeout(opt_timeout);\r\n  }\r\n  // restart only if a timer is currently set\r\n  if (this.watchDogTimerId_) {\r\n    this.cancelWatchDogTimer_();\r\n    this.ensureWatchDogTimer_();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Ensures that there is watchdog timeout which is used to ensure that\r\n * the connection completes in time.\r\n *\r\n * @private\r\n */\r\nChannelRequest.prototype.ensureWatchDogTimer_ = function() {\r\n  this.watchDogTimeoutTime_ = goog.now() + this.timeout_;\r\n  this.startWatchDogTimer_(this.timeout_);\r\n};\r\n\r\n\r\n/**\r\n * Starts the watchdog timer which is used to ensure that the connection\r\n * completes in time.\r\n * @param {number} time The number of milliseconds to wait.\r\n * @private\r\n */\r\nChannelRequest.prototype.startWatchDogTimer_ = function(time) {\r\n  if (this.watchDogTimerId_ != null) {\r\n    // assertion\r\n    throw new Error('WatchDog timer not null');\r\n  }\r\n  this.watchDogTimerId_ =\r\n      requestStats.setTimeout(goog.bind(this.onWatchDogTimeout_, this), time);\r\n};\r\n\r\n\r\n/**\r\n * Cancels the watchdog timer if it has been started.\r\n *\r\n * @private\r\n */\r\nChannelRequest.prototype.cancelWatchDogTimer_ = function() {\r\n  if (this.watchDogTimerId_) {\r\n    goog.global.clearTimeout(this.watchDogTimerId_);\r\n    this.watchDogTimerId_ = null;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Called when the watchdog timer is triggered. It also handles a case where it\r\n * is called too early which we suspect may be happening sometimes\r\n * (not sure why)\r\n *\r\n * @private\r\n */\r\nChannelRequest.prototype.onWatchDogTimeout_ = function() {\r\n  this.watchDogTimerId_ = null;\r\n  var now = goog.now();\r\n  if (now - this.watchDogTimeoutTime_ >= 0) {\r\n    this.handleTimeout_();\r\n  } else {\r\n    // got called too early for some reason\r\n    this.channelDebug_.warning('WatchDog timer called too early');\r\n    this.startWatchDogTimer_(this.watchDogTimeoutTime_ - now);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Called when the request has actually timed out. Will cleanup and notify the\r\n * channel of the failure.\r\n *\r\n * @private\r\n */\r\nChannelRequest.prototype.handleTimeout_ = function() {\r\n  if (this.successful_) {\r\n    // Should never happen.\r\n    this.channelDebug_.severe(\r\n        'Received watchdog timeout even though request loaded successfully');\r\n  }\r\n\r\n  this.channelDebug_.timeoutResponse(this.requestUri_);\r\n\r\n  // IMG or SendBeacon requests never notice if they were successful,\r\n  // and always 'time out'. This fact says nothing about reachability.\r\n  if (this.type_ != ChannelRequest.Type_.CLOSE_REQUEST) {\r\n    requestStats.notifyServerReachabilityEvent(\r\n        requestStats.ServerReachability.REQUEST_FAILED);\r\n    requestStats.notifyStatEvent(requestStats.Stat.REQUEST_TIMEOUT);\r\n  }\r\n\r\n  this.cleanup_();\r\n\r\n  // Set error and dispatch failure.\r\n  // This is called for CLOSE_REQUEST too to ensure channel_.onRequestComplete.\r\n  this.lastError_ = ChannelRequest.Error.TIMEOUT;\r\n  this.dispatchFailure_();\r\n};\r\n\r\n\r\n/**\r\n * Notifies the channel that this request failed.\r\n * @private\r\n */\r\nChannelRequest.prototype.dispatchFailure_ = function() {\r\n  if (this.channel_.isClosed() || this.cancelled_) {\r\n    return;\r\n  }\r\n\r\n  this.channel_.onRequestComplete(this);\r\n};\r\n\r\n\r\n/**\r\n * Cleans up the objects used to make the request. This function is\r\n * idempotent.\r\n *\r\n * @private\r\n */\r\nChannelRequest.prototype.cleanup_ = function() {\r\n  this.cancelWatchDogTimer_();\r\n\r\n  goog.dispose(this.readyStateChangeThrottle_);\r\n  this.readyStateChangeThrottle_ = null;\r\n\r\n  // Stop the polling timer, if necessary.\r\n  this.pollingTimer_.stop();\r\n\r\n  // Unhook all event handlers.\r\n  this.eventHandler_.removeAll();\r\n\r\n  if (this.xmlHttp_) {\r\n    // clear out this.xmlHttp_ before aborting so we handle getting reentered\r\n    // inside abort\r\n    var xmlhttp = this.xmlHttp_;\r\n    this.xmlHttp_ = null;\r\n    xmlhttp.abort();\r\n    xmlhttp.dispose();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Indicates whether the request was successful. Only valid after the handler\r\n * is called to indicate completion of the request.\r\n *\r\n * @return {boolean} True if the request succeeded.\r\n */\r\nChannelRequest.prototype.getSuccess = function() {\r\n  return this.successful_;\r\n};\r\n\r\n\r\n/**\r\n * If the request was not successful, returns the reason.\r\n *\r\n * @return {?ChannelRequest.Error}  The last error.\r\n */\r\nChannelRequest.prototype.getLastError = function() {\r\n  return this.lastError_;\r\n};\r\n\r\n\r\n/**\r\n * Returns the status code of the last request.\r\n * @return {number} The status code of the last request.\r\n */\r\nChannelRequest.prototype.getLastStatusCode = function() {\r\n  return this.lastStatusCode_;\r\n};\r\n\r\n\r\n/**\r\n * Returns the session id for this channel.\r\n *\r\n * @return {string|undefined} The session ID.\r\n */\r\nChannelRequest.prototype.getSessionId = function() {\r\n  return this.sid_;\r\n};\r\n\r\n\r\n/**\r\n * Returns the request id for this request. Each request has a unique request\r\n * id and the request IDs are a sequential increasing count.\r\n *\r\n * @return {string|number|undefined} The request ID.\r\n */\r\nChannelRequest.prototype.getRequestId = function() {\r\n  return this.rid_;\r\n};\r\n\r\n\r\n/**\r\n * Returns the data for a post, if this request is a post.\r\n *\r\n * @return {?string} The POST data provided by the request initiator.\r\n */\r\nChannelRequest.prototype.getPostData = function() {\r\n  return this.postData_;\r\n};\r\n\r\n\r\n/**\r\n * Returns the XhrIo request object.\r\n *\r\n * @return {?goog.net.XhrIo} Any XhrIo request created for this object.\r\n */\r\nChannelRequest.prototype.getXhr = function() {\r\n  return this.xmlHttp_;\r\n};\r\n\r\n\r\n/**\r\n * Returns the time that the request started, if it has started.\r\n *\r\n * @return {?number} The time the request started, as returned by goog.now().\r\n */\r\nChannelRequest.prototype.getRequestStartTime = function() {\r\n  return this.requestStartTime_;\r\n};\r\n\r\n\r\n/**\r\n * Helper to call the callback's onRequestData, which catches any\r\n * exception.\r\n * @param {string} data The request data.\r\n * @private\r\n */\r\nChannelRequest.prototype.safeOnRequestData_ = function(data) {\r\n  try {\r\n    this.channel_.onRequestData(this, data);\r\n    var stats = requestStats.ServerReachability;\r\n    requestStats.notifyServerReachabilityEvent(stats.BACK_CHANNEL_ACTIVITY);\r\n  } catch (e) {\r\n    // Dump debug info, but keep going without closing the channel.\r\n    this.channelDebug_.dumpException(e, 'Error in httprequest callback');\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Convenience factory method.\r\n *\r\n * @param {Channel} channel The channel object that owns this request.\r\n * @param {WebChannelDebug} channelDebug A WebChannelDebug to use for logging.\r\n * @param {string=} opt_sessionId  The session id for the channel.\r\n * @param {string|number=} opt_requestId  The request id for this request.\r\n * @param {number=} opt_retryId  The retry id for this request.\r\n * @return {!ChannelRequest} The created channel request.\r\n */\r\nChannelRequest.createChannelRequest = function(\r\n    channel, channelDebug, opt_sessionId, opt_requestId, opt_retryId) {\r\n  return new ChannelRequest(\r\n      channel, channelDebug, opt_sessionId, opt_requestId, opt_retryId);\r\n};\r\n});  // goog.scope\r\n","// Copyright 2018 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview A single module to define user-agent specific environment\r\n * details.\r\n */\r\n\r\ngoog.module('goog.labs.net.webChannel.environment');\r\n\r\ngoog.module.declareLegacyNamespace();\r\n\r\nvar userAgent = goog.require('goog.userAgent');\r\n\r\n\r\n/**\r\n * The default polling interval in millis for Edge.\r\n *\r\n * Currently on edge, new-chunk events may be not be fired (at all) if a new\r\n * chunk arrives within 50ms following the previous chunk. This may be fixed\r\n * in future, which requires changes to the whatwg spec too.\r\n *\r\n * @private @const {number}\r\n */\r\nvar EDGE_POLLING_INTERVAL_ = 125;\r\n\r\n\r\n/**\r\n * History:\r\n *\r\n * IE11 is still using Trident, the traditional engine for IE.\r\n * Edge is using EdgeHTML, a fork of Trident. We are seeing the same issue\r\n * on IE-11 (reported in 2017), so treat IE the same as Edge for now.\r\n *\r\n * We used to do polling for Opera (only) with an 250ms interval, because Opera\r\n * only fires readyState == INTERACTIVE once. Opera switched to WebKit in 2013,\r\n * and then to Blink (chrome).\r\n *\r\n * TODO(user): check the raw UA string to keep polling for old, mobile operas\r\n * that may still be affected. For old Opera, double the polling interval\r\n * to 250ms.\r\n *\r\n * @return {boolean} True if polling is required with XHR.\r\n */\r\nexports.isPollingRequired = function() {\r\n  return userAgent.EDGE_OR_IE;\r\n};\r\n\r\n\r\n/**\r\n * How often to poll (in MS) for changes to responseText in browsers that don't\r\n * fire onreadystatechange during incremental loading of the response body.\r\n *\r\n * @return {number|undefined} The polling interval (MS) for the current U-A;\r\n * or undefined if polling is not supposed to be enabled.\r\n */\r\nexports.getPollingInterval = function() {\r\n  if (userAgent.EDGE_OR_IE) {\r\n    return EDGE_POLLING_INTERVAL_;\r\n  }\r\n\r\n  return undefined;\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Base WebChannel implementation.\r\n *\r\n */\r\n\r\n\r\ngoog.provide('goog.labs.net.webChannel.WebChannelBase');\r\n\r\ngoog.require('goog.Uri');\r\ngoog.require('goog.array');\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.async.run');\r\ngoog.require('goog.debug.TextFormatter');\r\ngoog.require('goog.json');\r\ngoog.require('goog.labs.net.webChannel.BaseTestChannel');\r\ngoog.require('goog.labs.net.webChannel.Channel');\r\ngoog.require('goog.labs.net.webChannel.ChannelRequest');\r\ngoog.require('goog.labs.net.webChannel.ConnectionState');\r\ngoog.require('goog.labs.net.webChannel.ForwardChannelRequestPool');\r\ngoog.require('goog.labs.net.webChannel.WebChannelDebug');\r\ngoog.require('goog.labs.net.webChannel.Wire');\r\ngoog.require('goog.labs.net.webChannel.WireV8');\r\ngoog.require('goog.labs.net.webChannel.netUtils');\r\ngoog.require('goog.labs.net.webChannel.requestStats');\r\ngoog.require('goog.log');\r\ngoog.require('goog.net.WebChannel');\r\ngoog.require('goog.net.XhrIo');\r\ngoog.require('goog.net.XmlHttpFactory');\r\ngoog.require('goog.net.rpc.HttpCors');\r\ngoog.require('goog.object');\r\ngoog.require('goog.string');\r\ngoog.require('goog.structs');\r\ngoog.require('goog.structs.CircularBuffer');\r\n\r\ngoog.scope(function() {\r\nvar WebChannel = goog.net.WebChannel;\r\nvar BaseTestChannel = goog.labs.net.webChannel.BaseTestChannel;\r\nvar ChannelRequest = goog.labs.net.webChannel.ChannelRequest;\r\nvar ConnectionState = goog.labs.net.webChannel.ConnectionState;\r\nvar ForwardChannelRequestPool =\r\n    goog.labs.net.webChannel.ForwardChannelRequestPool;\r\nvar WebChannelDebug = goog.labs.net.webChannel.WebChannelDebug;\r\nvar Wire = goog.labs.net.webChannel.Wire;\r\nvar WireV8 = goog.labs.net.webChannel.WireV8;\r\nvar netUtils = goog.labs.net.webChannel.netUtils;\r\nvar requestStats = goog.labs.net.webChannel.requestStats;\r\n\r\nvar httpCors = goog.module.get('goog.net.rpc.HttpCors');\r\n\r\n\r\n/**\r\n * This WebChannel implementation is branched off goog.net.BrowserChannel\r\n * for now. Ongoing changes to goog.net.BrowserChannel will be back\r\n * ported to this implementation as needed.\r\n *\r\n * @param {!goog.net.WebChannel.Options=} opt_options Configuration for the\r\n *        WebChannel instance.\r\n * @param {number=} opt_clientVersion An application-specific version number\r\n *        that is sent to the server when connected.\r\n * @param {!ConnectionState=} opt_conn Previously determined connection\r\n *        conditions.\r\n * @constructor\r\n * @struct\r\n * @implements {goog.labs.net.webChannel.Channel}\r\n */\r\ngoog.labs.net.webChannel.WebChannelBase = function(\r\n    opt_options, opt_clientVersion, opt_conn) {\r\n  /**\r\n   * The client library version (capabilities).\r\n   * @private {number}\r\n   */\r\n  this.clientVersion_ = opt_clientVersion || 0;\r\n\r\n  /**\r\n   * The server library version (capabilities).\r\n   * @private {number}\r\n   */\r\n  this.serverVersion_ = 0;\r\n\r\n\r\n  /**\r\n   * An array of queued maps that need to be sent to the server.\r\n   * @private {!Array<Wire.QueuedMap>}\r\n   */\r\n  this.outgoingMaps_ = [];\r\n\r\n  /**\r\n   * The channel debug used for logging\r\n   * @private {!WebChannelDebug}\r\n   */\r\n  this.channelDebug_ = new WebChannelDebug();\r\n\r\n  /**\r\n   * Previous connectivity test results.\r\n   * @private {!ConnectionState}\r\n   */\r\n  this.connState_ = opt_conn || new ConnectionState();\r\n\r\n  /**\r\n   * Extra HTTP headers to add to all the requests sent to the server.\r\n   * @private {Object}\r\n   */\r\n  this.extraHeaders_ = null;\r\n\r\n  /**\r\n   * Extra HTTP headers to add to the init request(s) sent to the server.\r\n   * @private {Object}\r\n   */\r\n  this.initHeaders_ = null;\r\n\r\n  /**\r\n   * @private {?string} The URL param name to overwrite custom HTTP headers\r\n   * to bypass CORS preflight.\r\n   */\r\n  this.httpHeadersOverwriteParam_ = null;\r\n\r\n  /**\r\n   * Extra parameters to add to all the requests sent to the server.\r\n   * @private {Object}\r\n   */\r\n  this.extraParams_ = null;\r\n\r\n  /**\r\n   * Parameter name for the http session id.\r\n   * @private {?string}\r\n   */\r\n  this.httpSessionIdParam_ = null;\r\n\r\n  /**\r\n   * The http session id, to be sent with httpSessionIdParam_ with each\r\n   * request after the initial handshake.\r\n   * @private {?string}\r\n   */\r\n  this.httpSessionId_ = null;\r\n\r\n  /**\r\n   * The ChannelRequest object for the backchannel.\r\n   * @private {ChannelRequest}\r\n   */\r\n  this.backChannelRequest_ = null;\r\n\r\n  /**\r\n   * The relative path (in the context of the the page hosting the browser\r\n   * channel) for making requests to the server.\r\n   * @private {?string}\r\n   */\r\n  this.path_ = null;\r\n\r\n  /**\r\n   * The absolute URI for the forwardchannel request.\r\n   * @private {goog.Uri}\r\n   */\r\n  this.forwardChannelUri_ = null;\r\n\r\n  /**\r\n   * The absolute URI for the backchannel request.\r\n   * @private {goog.Uri}\r\n   */\r\n  this.backChannelUri_ = null;\r\n\r\n  /**\r\n   * A subdomain prefix for using a subdomain in IE for the backchannel\r\n   * requests.\r\n   * @private {?string}\r\n   */\r\n  this.hostPrefix_ = null;\r\n\r\n  /**\r\n   * Whether we allow the use of a subdomain in IE for the backchannel requests.\r\n   * @private {boolean}\r\n   */\r\n  this.allowHostPrefix_ = true;\r\n\r\n  /**\r\n   * The next id to use for the RID (request identifier) parameter. This\r\n   * identifier uniquely identifies the forward channel request.\r\n   * @private {number}\r\n   */\r\n  this.nextRid_ = 0;\r\n\r\n  /**\r\n   * The id to use for the next outgoing map. This identifier uniquely\r\n   * identifies a sent map.\r\n   * @private {number}\r\n   */\r\n  this.nextMapId_ = 0;\r\n\r\n  /**\r\n   * Whether to fail forward-channel requests after one try or a few tries.\r\n   * @private {boolean}\r\n   */\r\n  this.failFast_ =\r\n      !!goog.getObjectByName('internalChannelParams.failFast', opt_options);\r\n\r\n  /**\r\n   * The handler that receive callbacks for state changes and data.\r\n   * @private {goog.labs.net.webChannel.WebChannelBase.Handler}\r\n   */\r\n  this.handler_ = null;\r\n\r\n  /**\r\n   * Timer identifier for asynchronously making a forward channel request.\r\n   * This is set to true if the func is scheduled with async.run, which\r\n   * is equivalent to setTimeout(0).\r\n   * @private {?number|?boolean}\r\n   */\r\n  this.forwardChannelTimerId_ = null;\r\n\r\n  /**\r\n   * Timer identifier for asynchronously making a back channel request.\r\n   * @private {?number}\r\n   */\r\n  this.backChannelTimerId_ = null;\r\n\r\n  /**\r\n   * Timer identifier for the timer that waits for us to retry the backchannel\r\n   * in the case where it is dead and no longer receiving data.\r\n   * @private {?number}\r\n   */\r\n  this.deadBackChannelTimerId_ = null;\r\n\r\n  /**\r\n   * The TestChannel object which encapsulates the logic for determining\r\n   * interesting network conditions about the client.\r\n   * @private {BaseTestChannel}\r\n   */\r\n  this.connectionTest_ = null;\r\n\r\n  /**\r\n   * Whether the client's network conditions can support chunked responses.\r\n   * @private {?boolean}\r\n   */\r\n  this.useChunked_ = null;\r\n\r\n  /**\r\n   * Whether chunked mode is allowed. In certain debugging situations, it's\r\n   * useful to disable this.\r\n   * @private {boolean}\r\n   */\r\n  this.allowChunkedMode_ = true;\r\n\r\n  /**\r\n   * The array identifier of the last array received from the server for the\r\n   * backchannel request.\r\n   * @private {number}\r\n   */\r\n  this.lastArrayId_ = -1;\r\n\r\n  /**\r\n   * The array id of the last array sent by the server that we know about.\r\n   * @private {number}\r\n   */\r\n  this.lastPostResponseArrayId_ = -1;\r\n\r\n  /**\r\n   * The last status code received.\r\n   * @private {number}\r\n   */\r\n  this.lastStatusCode_ = -1;\r\n\r\n  /**\r\n   * Number of times we have retried the current forward channel request.\r\n   * @private {number}\r\n   */\r\n  this.forwardChannelRetryCount_ = 0;\r\n\r\n  /**\r\n   * Number of times in a row that we have retried the current back channel\r\n   * request and received no data.\r\n   * @private {number}\r\n   */\r\n  this.backChannelRetryCount_ = 0;\r\n\r\n  /**\r\n   * The attempt id for the current back channel request. Starts at 1 and\r\n   * increments for each reconnect. The server uses this to log if our\r\n   * connection is flaky or not.\r\n   * @private {number}\r\n   */\r\n  this.backChannelAttemptId_ = 0;\r\n\r\n  /**\r\n   * The base part of the time before firing next retry request. Default is 5\r\n   * seconds. Note that a random delay is added (see {@link retryDelaySeedMs_})\r\n   * for all retries, and linear backoff is applied to the sum for subsequent\r\n   * retries.\r\n   * @private {number}\r\n   */\r\n  this.baseRetryDelayMs_ =\r\n      goog.getObjectByName(\r\n          'internalChannelParams.baseRetryDelayMs', opt_options) ||\r\n      5 * 1000;\r\n\r\n  /**\r\n   * A random time between 0 and this number of MS is added to the\r\n   * {@link baseRetryDelayMs_}. Default is 10 seconds.\r\n   * @private {number}\r\n   */\r\n  this.retryDelaySeedMs_ =\r\n      goog.getObjectByName(\r\n          'internalChannelParams.retryDelaySeedMs', opt_options) ||\r\n      10 * 1000;\r\n\r\n  /**\r\n   * Maximum number of attempts to connect to the server for forward channel\r\n   * requests. Defaults to 2.\r\n   * @private {number}\r\n   */\r\n  this.forwardChannelMaxRetries_ =\r\n      goog.getObjectByName(\r\n          'internalChannelParams.forwardChannelMaxRetries', opt_options) ||\r\n      2;\r\n\r\n  /**\r\n   * The timeout in milliseconds for a forward channel request. Defaults to 20\r\n   * seconds. Note that part of this timeout can be randomized.\r\n   * @private {number}\r\n   */\r\n  this.forwardChannelRequestTimeoutMs_ =\r\n      goog.getObjectByName(\r\n          'internalChannelParams.forwardChannelRequestTimeoutMs',\r\n          opt_options) ||\r\n      20 * 1000;\r\n\r\n  /**\r\n   * The custom factory used to create XMLHttpRequest objects.\r\n   * @private {!goog.net.XmlHttpFactory | undefined}\r\n   */\r\n  this.xmlHttpFactory_ =\r\n      (opt_options && opt_options.xmlHttpFactory) || undefined;\r\n\r\n  /**\r\n   * The timeout in milliseconds for a back channel request. Defaults to using\r\n   * the timeout configured in ChannelRequest (45s). If server-side\r\n   * keepaliveInterval is known to the client, set the backchannel request\r\n   * timeout to 1.5 * keepaliveInterval (ms).\r\n   *\r\n   * @private {number|undefined}\r\n   */\r\n  this.backChannelRequestTimeoutMs_ = undefined;\r\n\r\n  /**\r\n   * A throttle time in ms for readystatechange events for the backchannel.\r\n   * Useful for throttling when ready state is INTERACTIVE (partial data).\r\n   *\r\n   * This throttle is useful if the server sends large data chunks down the\r\n   * backchannel.  It prevents examining XHR partial data on every readystate\r\n   * change event.  This is useful because large chunks can trigger hundreds\r\n   * of readystatechange events, each of which takes ~5ms or so to handle,\r\n   * in turn making the UI unresponsive for a significant period.\r\n   *\r\n   * If set to zero no throttle is used.\r\n   * @private {number}\r\n   */\r\n  this.readyStateChangeThrottleMs_ = 0;\r\n\r\n  /**\r\n   * Whether cross origin requests are supported for the channel.\r\n   *\r\n   * See {@link goog.net.XhrIo#setWithCredentials}.\r\n   * @private {boolean}\r\n   */\r\n  this.supportsCrossDomainXhrs_ =\r\n      (opt_options && opt_options.supportsCrossDomainXhr) || false;\r\n\r\n  /**\r\n   * The current session id.\r\n   * @private {string}\r\n   */\r\n  this.sid_ = '';\r\n\r\n  /**\r\n   * The current ChannelRequest pool for the forward channel.\r\n   * @private {!ForwardChannelRequestPool}\r\n   */\r\n  this.forwardChannelRequestPool_ = new ForwardChannelRequestPool(\r\n      opt_options && opt_options.concurrentRequestLimit);\r\n\r\n  /**\r\n   * The V8 codec.\r\n   * @private {!WireV8}\r\n   */\r\n  this.wireCodec_ = new WireV8();\r\n\r\n  /**\r\n   * Whether to run the channel test as a background process to not block\r\n   * the OPEN event.\r\n   *\r\n   * @private {boolean}\r\n   */\r\n  this.backgroundChannelTest_ =\r\n      opt_options && goog.isDef(opt_options.backgroundChannelTest) ?\r\n      opt_options.backgroundChannelTest :\r\n      true;\r\n\r\n  /**\r\n   * Whether to turn on the fast handshake behavior.\r\n   *\r\n   * @private {boolean}\r\n   */\r\n  this.fastHandshake_ = (opt_options && opt_options.fastHandshake) || false;\r\n\r\n  if (this.fastHandshake_ && !this.backgroundChannelTest_) {\r\n    this.channelDebug_.warning(\r\n        'Force backgroundChannelTest when fastHandshake is enabled.');\r\n    this.backgroundChannelTest_ = true;\r\n  }\r\n\r\n  if (opt_options && opt_options.disableRedact) {\r\n    this.channelDebug_.disableRedact();\r\n  }\r\n\r\n  if (opt_options && opt_options.forceLongPolling) {\r\n    this.allowChunkedMode_ = false;\r\n  }\r\n\r\n  /**\r\n   * Callback when all the pending client-sent messages have been flushed.\r\n   *\r\n   * @private {function()|undefined}\r\n   */\r\n  this.forwardChannelFlushedCallback_ = undefined;\r\n};\r\n\r\nvar WebChannelBase = goog.labs.net.webChannel.WebChannelBase;\r\n\r\n\r\n/**\r\n * The channel version that we negotiated with the server for this session.\r\n * Starts out as the version we request, and then is changed to the negotiated\r\n * version after the initial open.\r\n * @private {number}\r\n */\r\nWebChannelBase.prototype.channelVersion_ = Wire.LATEST_CHANNEL_VERSION;\r\n\r\n\r\n/**\r\n * Enum type for the channel state machine.\r\n * @enum {number}\r\n */\r\nWebChannelBase.State = {\r\n  /** The channel is closed. */\r\n  CLOSED: 0,\r\n\r\n  /** The channel has been initialized but hasn't yet initiated a connection. */\r\n  INIT: 1,\r\n\r\n  /** The channel is in the process of opening a connection to the server. */\r\n  OPENING: 2,\r\n\r\n  /** The channel is open. */\r\n  OPENED: 3\r\n};\r\n\r\n\r\n/**\r\n * The current state of the WebChannel.\r\n * @private {!WebChannelBase.State}\r\n */\r\nWebChannelBase.prototype.state_ = WebChannelBase.State.INIT;\r\n\r\n\r\n/**\r\n * The timeout in milliseconds for a forward channel request.\r\n * @type {number}\r\n */\r\nWebChannelBase.FORWARD_CHANNEL_RETRY_TIMEOUT = 20 * 1000;\r\n\r\n\r\n/**\r\n * Maximum number of attempts to connect to the server for back channel\r\n * requests.\r\n * @type {number}\r\n */\r\nWebChannelBase.BACK_CHANNEL_MAX_RETRIES = 3;\r\n\r\n\r\n/**\r\n * A number in MS of how long we guess the maxmium amount of time a round trip\r\n * to the server should take. In the future this could be substituted with a\r\n * real measurement of the RTT.\r\n * @type {number}\r\n */\r\nWebChannelBase.RTT_ESTIMATE = 3 * 1000;\r\n\r\n\r\n/**\r\n * When retrying for an inactive channel, we will multiply the total delay by\r\n * this number.\r\n * @type {number}\r\n */\r\nWebChannelBase.INACTIVE_CHANNEL_RETRY_FACTOR = 2;\r\n\r\n\r\n/**\r\n * Enum type for identifying an error.\r\n * @enum {number}\r\n */\r\nWebChannelBase.Error = {\r\n  /** Value that indicates no error has occurred. */\r\n  OK: 0,\r\n\r\n  /** An error due to a request failing. */\r\n  REQUEST_FAILED: 2,\r\n\r\n  /** An error due to the user being logged out. */\r\n  LOGGED_OUT: 4,\r\n\r\n  /** An error due to server response which contains no data. */\r\n  NO_DATA: 5,\r\n\r\n  /** An error due to a server response indicating an unknown session id */\r\n  UNKNOWN_SESSION_ID: 6,\r\n\r\n  /** An error due to a server response requesting to stop the channel. */\r\n  STOP: 7,\r\n\r\n  /** A general network error. */\r\n  NETWORK: 8,\r\n\r\n  /** An error due to bad data being returned from the server. */\r\n  BAD_DATA: 10,\r\n\r\n  /** An error due to a response that is not parsable. */\r\n  BAD_RESPONSE: 11\r\n};\r\n\r\n\r\n/**\r\n * Internal enum type for the two channel types.\r\n * @enum {number}\r\n * @private\r\n */\r\nWebChannelBase.ChannelType_ = {\r\n  FORWARD_CHANNEL: 1,\r\n\r\n  BACK_CHANNEL: 2\r\n};\r\n\r\n\r\n/**\r\n * The maximum number of maps that can be sent in one POST. Should match\r\n * MAX_MAPS_PER_REQUEST on the server code.\r\n * @type {number}\r\n * @private\r\n */\r\nWebChannelBase.MAX_MAPS_PER_REQUEST_ = 1000;\r\n\r\n\r\n/**\r\n * The maximum number of utf-8 chars that can be sent in one GET to enable 0-RTT\r\n * handshake.\r\n *\r\n *  @const @private {number}\r\n */\r\nWebChannelBase.MAX_CHARS_PER_GET_ = 4 * 1024;\r\n\r\n\r\n/**\r\n * A guess at a cutoff at which to no longer assume the backchannel is dead\r\n * when we are slow to receive data. Number in bytes.\r\n *\r\n * Assumption: The worst bandwidth we work on is 50 kilobits/sec\r\n * 50kbits/sec * (1 byte / 8 bits) * 6 sec dead backchannel timeout\r\n * @type {number}\r\n */\r\nWebChannelBase.OUTSTANDING_DATA_BACKCHANNEL_RETRY_CUTOFF = 37500;\r\n\r\n\r\n/**\r\n * @return {number} The server version or 0 if undefined\r\n */\r\nWebChannelBase.prototype.getServerVersion = function() {\r\n  return this.serverVersion_;\r\n};\r\n\r\n\r\n/**\r\n * @return {!ForwardChannelRequestPool} The forward channel request pool.\r\n */\r\nWebChannelBase.prototype.getForwardChannelRequestPool = function() {\r\n  return this.forwardChannelRequestPool_;\r\n};\r\n\r\n\r\n/**\r\n * @return {!Object} The codec object, to be used for the test channel.\r\n */\r\nWebChannelBase.prototype.getWireCodec = function() {\r\n  return this.wireCodec_;\r\n};\r\n\r\n\r\n/**\r\n * Returns the logger.\r\n *\r\n * @return {!WebChannelDebug} The channel debug object.\r\n */\r\nWebChannelBase.prototype.getChannelDebug = function() {\r\n  return this.channelDebug_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the logger.\r\n *\r\n * @param {!WebChannelDebug} channelDebug The channel debug object.\r\n */\r\nWebChannelBase.prototype.setChannelDebug = function(channelDebug) {\r\n  this.channelDebug_ = channelDebug;\r\n};\r\n\r\n\r\n/**\r\n * Starts the channel. This initiates connections to the server.\r\n *\r\n * @param {string} testPath  The path for the test connection.\r\n * @param {string} channelPath  The path for the channel connection.\r\n * @param {!Object=} opt_extraParams Extra parameter keys and values to add to\r\n *     the requests.\r\n * @param {string=} opt_oldSessionId  Session ID from a previous session.\r\n * @param {number=} opt_oldArrayId  The last array ID from a previous session.\r\n */\r\nWebChannelBase.prototype.connect = function(\r\n    testPath, channelPath, opt_extraParams, opt_oldSessionId, opt_oldArrayId) {\r\n  this.channelDebug_.debug('connect()');\r\n\r\n  requestStats.notifyStatEvent(requestStats.Stat.CONNECT_ATTEMPT);\r\n\r\n  this.path_ = channelPath;\r\n  this.extraParams_ = opt_extraParams || {};\r\n\r\n  // Attach parameters about the previous session if reconnecting.\r\n  if (opt_oldSessionId && goog.isDef(opt_oldArrayId)) {\r\n    this.extraParams_['OSID'] = opt_oldSessionId;\r\n    this.extraParams_['OAID'] = opt_oldArrayId;\r\n  }\r\n\r\n  if (this.backgroundChannelTest_) {\r\n    this.channelDebug_.debug('connect() bypassed channel-test.');\r\n    this.connState_.handshakeResult = [];\r\n    this.connState_.bufferingProxyResult = false;\r\n\r\n    // TODO(user): merge states with background channel test\r\n    // requestStats.setTimeout(goog.bind(this.connectTest_, this, testPath), 0);\r\n    //     this.connectChannel_();\r\n  }\r\n\r\n  this.connectTest_(testPath);\r\n};\r\n\r\n\r\n/**\r\n * Disconnects and closes the channel.\r\n */\r\nWebChannelBase.prototype.disconnect = function() {\r\n  this.channelDebug_.debug('disconnect()');\r\n\r\n  this.cancelRequests_();\r\n\r\n  if (this.state_ == WebChannelBase.State.OPENED) {\r\n    var rid = this.nextRid_++;\r\n    var uri = this.forwardChannelUri_.clone();\r\n    uri.setParameterValue('SID', this.sid_);\r\n    uri.setParameterValue('RID', rid);\r\n    uri.setParameterValue('TYPE', 'terminate');\r\n\r\n    // Add the reconnect parameters.\r\n    this.addAdditionalParams_(uri);\r\n\r\n    var request = ChannelRequest.createChannelRequest(\r\n        this, this.channelDebug_, this.sid_, rid);\r\n    request.sendCloseRequest(uri);\r\n  }\r\n\r\n  this.onClose_();\r\n};\r\n\r\n\r\n/**\r\n * Returns the session id of the channel. Only available after the\r\n * channel has been opened.\r\n * @return {string} Session ID.\r\n */\r\nWebChannelBase.prototype.getSessionId = function() {\r\n  return this.sid_;\r\n};\r\n\r\n\r\n/**\r\n * Starts the test channel to determine network conditions.\r\n *\r\n * @param {string} testPath  The relative PATH for the test connection.\r\n * @private\r\n */\r\nWebChannelBase.prototype.connectTest_ = function(testPath) {\r\n  this.channelDebug_.debug('connectTest_()');\r\n  if (!this.okToMakeRequest_()) {\r\n    return;  // channel is cancelled\r\n  }\r\n  this.connectionTest_ = new BaseTestChannel(this, this.channelDebug_);\r\n\r\n  if (this.httpHeadersOverwriteParam_ === null) {\r\n    this.connectionTest_.setExtraHeaders(this.extraHeaders_);\r\n  }\r\n\r\n  var urlPath = testPath;\r\n  if (this.httpHeadersOverwriteParam_ && this.extraHeaders_) {\r\n    urlPath = httpCors.setHttpHeadersWithOverwriteParam(\r\n        testPath, this.httpHeadersOverwriteParam_, this.extraHeaders_);\r\n  }\r\n\r\n  this.connectionTest_.connect(/** @type {string} */ (urlPath));\r\n};\r\n\r\n\r\n/**\r\n * Starts the regular channel which is run after the test channel is complete.\r\n * @private\r\n */\r\nWebChannelBase.prototype.connectChannel_ = function() {\r\n  this.channelDebug_.debug('connectChannel_()');\r\n  this.ensureInState_(WebChannelBase.State.INIT, WebChannelBase.State.CLOSED);\r\n  this.forwardChannelUri_ =\r\n      this.getForwardChannelUri(/** @type {string} */ (this.path_));\r\n  this.ensureForwardChannel_();\r\n};\r\n\r\n\r\n/**\r\n * Cancels all outstanding requests.\r\n * @private\r\n */\r\nWebChannelBase.prototype.cancelRequests_ = function() {\r\n  if (this.connectionTest_) {\r\n    this.connectionTest_.abort();\r\n    this.connectionTest_ = null;\r\n  }\r\n\r\n  if (this.backChannelRequest_) {\r\n    this.backChannelRequest_.cancel();\r\n    this.backChannelRequest_ = null;\r\n  }\r\n\r\n  if (this.backChannelTimerId_) {\r\n    goog.global.clearTimeout(this.backChannelTimerId_);\r\n    this.backChannelTimerId_ = null;\r\n  }\r\n\r\n  this.clearDeadBackchannelTimer_();\r\n\r\n  this.forwardChannelRequestPool_.cancel();\r\n\r\n  if (this.forwardChannelTimerId_) {\r\n    this.clearForwardChannelTimer_();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Clears the forward channel timer.\r\n * @private\r\n */\r\nWebChannelBase.prototype.clearForwardChannelTimer_ = function() {\r\n  if (goog.isNumber(this.forwardChannelTimerId_)) {\r\n    goog.global.clearTimeout(this.forwardChannelTimerId_);\r\n  }\r\n\r\n  this.forwardChannelTimerId_ = null;\r\n};\r\n\r\n\r\n/**\r\n * Returns the extra HTTP headers to add to all the requests sent to the server.\r\n *\r\n * @return {Object} The HTTP headers, or null.\r\n */\r\nWebChannelBase.prototype.getExtraHeaders = function() {\r\n  return this.extraHeaders_;\r\n};\r\n\r\n\r\n/**\r\n * Sets extra HTTP headers to add to all the requests sent to the server.\r\n *\r\n * @param {Object} extraHeaders The HTTP headers, or null.\r\n */\r\nWebChannelBase.prototype.setExtraHeaders = function(extraHeaders) {\r\n  this.extraHeaders_ = extraHeaders;\r\n};\r\n\r\n\r\n/**\r\n * Returns the extra HTTP headers to add to the init requests\r\n * sent to the server.\r\n *\r\n * @return {Object} The HTTP headers, or null.\r\n */\r\nWebChannelBase.prototype.getInitHeaders = function() {\r\n  return this.initHeaders_;\r\n};\r\n\r\n\r\n/**\r\n * Sets extra HTTP headers to add to the init requests sent to the server.\r\n *\r\n * @param {Object} initHeaders The HTTP headers, or null.\r\n */\r\nWebChannelBase.prototype.setInitHeaders = function(initHeaders) {\r\n  this.initHeaders_ = initHeaders;\r\n};\r\n\r\n\r\n/**\r\n * Sets the URL param name to overwrite custom HTTP headers.\r\n *\r\n * @param {string} httpHeadersOverwriteParam The URL param name.\r\n */\r\nWebChannelBase.prototype.setHttpHeadersOverwriteParam = function(\r\n    httpHeadersOverwriteParam) {\r\n  this.httpHeadersOverwriteParam_ = httpHeadersOverwriteParam;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.setHttpSessionIdParam = function(httpSessionIdParam) {\r\n  this.httpSessionIdParam_ = httpSessionIdParam;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.getHttpSessionIdParam = function() {\r\n  return this.httpSessionIdParam_;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.setHttpSessionId = function(httpSessionId) {\r\n  this.httpSessionId_ = httpSessionId;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.getHttpSessionId = function() {\r\n  return this.httpSessionId_;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.getBackgroundChannelTest = function() {\r\n  return this.backgroundChannelTest_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the throttle for handling onreadystatechange events for the request.\r\n *\r\n * @param {number} throttle The throttle in ms.  A value of zero indicates\r\n *     no throttle.\r\n */\r\nWebChannelBase.prototype.setReadyStateChangeThrottle = function(throttle) {\r\n  this.readyStateChangeThrottleMs_ = throttle;\r\n};\r\n\r\n\r\n/**\r\n * Sets whether cross origin requests are supported for the channel.\r\n *\r\n * Setting this allows the creation of requests to secondary domains and\r\n * sends XHRs with the CORS withCredentials bit set to true.\r\n *\r\n * In order for cross-origin requests to work, the server will also need to set\r\n * CORS response headers as per:\r\n * https://developer.mozilla.org/en-US/docs/HTTP_access_control\r\n *\r\n * See {@link goog.net.XhrIo#setWithCredentials}.\r\n * @param {boolean} supportCrossDomain Whether cross domain XHRs are supported.\r\n */\r\nWebChannelBase.prototype.setSupportsCrossDomainXhrs = function(\r\n    supportCrossDomain) {\r\n  this.supportsCrossDomainXhrs_ = supportCrossDomain;\r\n};\r\n\r\n\r\n/**\r\n * Returns the handler used for channel callback events.\r\n *\r\n * @return {WebChannelBase.Handler} The handler.\r\n */\r\nWebChannelBase.prototype.getHandler = function() {\r\n  return this.handler_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the handler used for channel callback events.\r\n * @param {WebChannelBase.Handler} handler The handler to set.\r\n */\r\nWebChannelBase.prototype.setHandler = function(handler) {\r\n  this.handler_ = handler;\r\n};\r\n\r\n\r\n/**\r\n * Returns whether the channel allows the use of a subdomain. There may be\r\n * cases where this isn't allowed.\r\n * @return {boolean} Whether a host prefix is allowed.\r\n */\r\nWebChannelBase.prototype.getAllowHostPrefix = function() {\r\n  return this.allowHostPrefix_;\r\n};\r\n\r\n\r\n/**\r\n * Sets whether the channel allows the use of a subdomain. There may be cases\r\n * where this isn't allowed, for example, logging in with troutboard where\r\n * using a subdomain causes Apache to force the user to authenticate twice.\r\n * @param {boolean} allowHostPrefix Whether a host prefix is allowed.\r\n */\r\nWebChannelBase.prototype.setAllowHostPrefix = function(allowHostPrefix) {\r\n  this.allowHostPrefix_ = allowHostPrefix;\r\n};\r\n\r\n\r\n/**\r\n * Returns whether the channel is buffered or not. This state is valid for\r\n * querying only after the test connection has completed. This may be\r\n * queried in the WebChannelBase.okToMakeRequest() callback.\r\n * A channel may be buffered if the test connection determines that\r\n * a chunked response could not be sent down within a suitable time.\r\n * @return {boolean} Whether the channel is buffered.\r\n */\r\nWebChannelBase.prototype.isBuffered = function() {\r\n  return !this.useChunked_;\r\n};\r\n\r\n\r\n/**\r\n * Returns whether chunked mode is allowed. In certain debugging situations,\r\n * it's useful for the application to have a way to disable chunked mode for a\r\n * user.\r\n\r\n * @return {boolean} Whether chunked mode is allowed.\r\n */\r\nWebChannelBase.prototype.getAllowChunkedMode = function() {\r\n  return this.allowChunkedMode_;\r\n};\r\n\r\n\r\n/**\r\n * Sets whether chunked mode is allowed. In certain debugging situations, it's\r\n * useful for the application to have a way to disable chunked mode for a user.\r\n * @param {boolean} allowChunkedMode  Whether chunked mode is allowed.\r\n */\r\nWebChannelBase.prototype.setAllowChunkedMode = function(allowChunkedMode) {\r\n  this.allowChunkedMode_ = allowChunkedMode;\r\n};\r\n\r\n\r\n/**\r\n * Sends a request to the server. The format of the request is a Map data\r\n * structure of key/value pairs. These maps are then encoded in a format\r\n * suitable for the wire and then reconstituted as a Map data structure that\r\n * the server can process.\r\n * @param {!Object|!goog.structs.Map} map The map to send.\r\n * @param {!Object=} opt_context The context associated with the map.\r\n */\r\nWebChannelBase.prototype.sendMap = function(map, opt_context) {\r\n  goog.asserts.assert(\r\n      this.state_ != WebChannelBase.State.CLOSED,\r\n      'Invalid operation: sending map when state is closed');\r\n\r\n  // We can only send 1000 maps per POST, but typically we should never have\r\n  // that much to send, so warn if we exceed that (we still send all the maps).\r\n  if (this.outgoingMaps_.length == WebChannelBase.MAX_MAPS_PER_REQUEST_) {\r\n    // severe() is temporary so that we get these uploaded and can figure out\r\n    // what's causing them. Afterwards can change to warning().\r\n    this.channelDebug_.severe(function() {\r\n      return 'Already have ' + WebChannelBase.MAX_MAPS_PER_REQUEST_ +\r\n          ' queued maps upon queueing ' + goog.json.serialize(map);\r\n    });\r\n  }\r\n\r\n  this.outgoingMaps_.push(\r\n      new Wire.QueuedMap(this.nextMapId_++, map, opt_context));\r\n\r\n  // Messages need be buffered during OPENING to avoid server-side race\r\n  if (this.state_ == WebChannelBase.State.OPENED) {\r\n    this.ensureForwardChannel_();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * When set to true, this changes the behavior of the forward channel so it\r\n * will not retry requests; it will fail after one network failure, and if\r\n * there was already one network failure, the request will fail immediately.\r\n * @param {boolean} failFast  Whether or not to fail fast.\r\n */\r\nWebChannelBase.prototype.setFailFast = function(failFast) {\r\n  this.failFast_ = failFast;\r\n  this.channelDebug_.info('setFailFast: ' + failFast);\r\n  if ((this.forwardChannelRequestPool_.hasPendingRequest() ||\r\n       this.forwardChannelTimerId_) &&\r\n      this.forwardChannelRetryCount_ > this.getForwardChannelMaxRetries()) {\r\n    var self = this;\r\n    this.channelDebug_.info(function() {\r\n      return 'Retry count ' + self.forwardChannelRetryCount_ +\r\n          ' > new maxRetries ' + self.getForwardChannelMaxRetries() +\r\n          '. Fail immediately!';\r\n    });\r\n\r\n    if (!this.forwardChannelRequestPool_.forceComplete(\r\n            goog.bind(this.onRequestComplete, this))) {\r\n      // i.e., this.forwardChannelTimerId_\r\n      this.clearForwardChannelTimer_();\r\n      // The error code from the last failed request is gone, so just use a\r\n      // generic one.\r\n      this.signalError_(WebChannelBase.Error.REQUEST_FAILED);\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {number} The max number of forward-channel retries, which will be 0\r\n * in fail-fast mode.\r\n */\r\nWebChannelBase.prototype.getForwardChannelMaxRetries = function() {\r\n  return this.failFast_ ? 0 : this.forwardChannelMaxRetries_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the maximum number of attempts to connect to the server for forward\r\n * channel requests.\r\n * @param {number} retries The maximum number of attempts.\r\n */\r\nWebChannelBase.prototype.setForwardChannelMaxRetries = function(retries) {\r\n  this.forwardChannelMaxRetries_ = retries;\r\n};\r\n\r\n\r\n/**\r\n * Sets the timeout for a forward channel request.\r\n * @param {number} timeoutMs The timeout in milliseconds.\r\n */\r\nWebChannelBase.prototype.setForwardChannelRequestTimeout = function(timeoutMs) {\r\n  this.forwardChannelRequestTimeoutMs_ = timeoutMs;\r\n};\r\n\r\n\r\n/**\r\n * @return {number} The max number of back-channel retries, which is a constant.\r\n */\r\nWebChannelBase.prototype.getBackChannelMaxRetries = function() {\r\n  // Back-channel retries is a constant.\r\n  return WebChannelBase.BACK_CHANNEL_MAX_RETRIES;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.isClosed = function() {\r\n  return this.state_ == WebChannelBase.State.CLOSED;\r\n};\r\n\r\n\r\n/**\r\n * Returns the channel state.\r\n * @return {WebChannelBase.State} The current state of the channel.\r\n */\r\nWebChannelBase.prototype.getState = function() {\r\n  return this.state_;\r\n};\r\n\r\n\r\n/**\r\n * Return the last status code received for a request.\r\n * @return {number} The last status code received for a request.\r\n */\r\nWebChannelBase.prototype.getLastStatusCode = function() {\r\n  return this.lastStatusCode_;\r\n};\r\n\r\n\r\n/**\r\n * @return {number} The last array id received.\r\n */\r\nWebChannelBase.prototype.getLastArrayId = function() {\r\n  return this.lastArrayId_;\r\n};\r\n\r\n\r\n/**\r\n * Returns whether there are outstanding requests servicing the channel.\r\n * @return {boolean} true if there are outstanding requests.\r\n */\r\nWebChannelBase.prototype.hasOutstandingRequests = function() {\r\n  return this.getOutstandingRequests_() != 0;\r\n};\r\n\r\n\r\n/**\r\n * Returns the number of outstanding requests.\r\n * @return {number} The number of outstanding requests to the server.\r\n * @private\r\n */\r\nWebChannelBase.prototype.getOutstandingRequests_ = function() {\r\n  var count = 0;\r\n  if (this.backChannelRequest_) {\r\n    count++;\r\n  }\r\n  count += this.forwardChannelRequestPool_.getRequestCount();\r\n  return count;\r\n};\r\n\r\n\r\n/**\r\n * Ensures that a forward channel request is scheduled.\r\n * @private\r\n */\r\nWebChannelBase.prototype.ensureForwardChannel_ = function() {\r\n  if (this.forwardChannelRequestPool_.isFull()) {\r\n    // enough connection in process - no need to start a new request\r\n    return;\r\n  }\r\n\r\n  if (this.forwardChannelTimerId_) {\r\n    // no need to start a new request - one is already scheduled\r\n    return;\r\n  }\r\n\r\n  // Use async.run instead of setTimeout(0) to avoid the 1s message delay\r\n  // from chrome/firefox background tabs\r\n  this.forwardChannelTimerId_ = true;\r\n  goog.async.run(this.onStartForwardChannelTimer_, this);\r\n\r\n  this.forwardChannelRetryCount_ = 0;\r\n};\r\n\r\n\r\n/**\r\n * Schedules a forward-channel retry for the specified request, unless the max\r\n * retries has been reached.\r\n * @param {!ChannelRequest} request The failed request to retry.\r\n * @return {boolean} true iff a retry was scheduled.\r\n * @private\r\n */\r\nWebChannelBase.prototype.maybeRetryForwardChannel_ = function(request) {\r\n  if (this.forwardChannelRequestPool_.getRequestCount() >=\r\n      this.forwardChannelRequestPool_.getMaxSize() -\r\n          (this.forwardChannelTimerId_ ? 1 : 0)) {\r\n    // Should be impossible to be called in this state.\r\n    this.channelDebug_.severe('Unexpected retry request is scheduled.');\r\n    return false;\r\n  }\r\n\r\n  if (this.forwardChannelTimerId_) {\r\n    this.channelDebug_.debug(\r\n        'Use the retry request that is already scheduled.');\r\n    this.outgoingMaps_ =\r\n        request.getPendingMessages().concat(this.outgoingMaps_);\r\n    return true;\r\n  }\r\n\r\n  // No retry for open_() and fail-fast\r\n  if (this.state_ == WebChannelBase.State.INIT ||\r\n      this.state_ == WebChannelBase.State.OPENING ||\r\n      (this.forwardChannelRetryCount_ >= this.getForwardChannelMaxRetries())) {\r\n    return false;\r\n  }\r\n\r\n  this.channelDebug_.debug('Going to retry POST');\r\n\r\n  this.forwardChannelTimerId_ = requestStats.setTimeout(\r\n      goog.bind(this.onStartForwardChannelTimer_, this, request),\r\n      this.getRetryTime_(this.forwardChannelRetryCount_));\r\n  this.forwardChannelRetryCount_++;\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * Timer callback for ensureForwardChannel\r\n * @param {ChannelRequest=} opt_retryRequest A failed request\r\n * to retry.\r\n * @private\r\n */\r\nWebChannelBase.prototype.onStartForwardChannelTimer_ = function(\r\n    opt_retryRequest) {\r\n  // null is possible if scheduled with async.run\r\n  if (this.forwardChannelTimerId_) {\r\n    this.forwardChannelTimerId_ = null;\r\n    this.startForwardChannel_(opt_retryRequest);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Begins a new forward channel operation to the server.\r\n * @param {ChannelRequest=} opt_retryRequest A failed request to retry.\r\n * @private\r\n */\r\nWebChannelBase.prototype.startForwardChannel_ = function(opt_retryRequest) {\r\n  this.channelDebug_.debug('startForwardChannel_');\r\n  if (!this.okToMakeRequest_()) {\r\n    return;  // channel is cancelled\r\n  } else if (this.state_ == WebChannelBase.State.INIT) {\r\n    if (opt_retryRequest) {\r\n      this.channelDebug_.severe('Not supposed to retry the open');\r\n      return;\r\n    }\r\n    this.open_();\r\n    this.state_ = WebChannelBase.State.OPENING;\r\n  } else if (this.state_ == WebChannelBase.State.OPENED) {\r\n    if (opt_retryRequest) {\r\n      this.makeForwardChannelRequest_(opt_retryRequest);\r\n      return;\r\n    }\r\n\r\n    if (this.outgoingMaps_.length == 0) {\r\n      this.channelDebug_.debug(\r\n          'startForwardChannel_ returned: ' +\r\n          'nothing to send');\r\n      // no need to start a new forward channel request\r\n      return;\r\n    }\r\n\r\n    if (this.forwardChannelRequestPool_.isFull()) {\r\n      // Should be impossible to be called in this state.\r\n      this.channelDebug_.severe(\r\n          'startForwardChannel_ returned: ' +\r\n          'connection already in progress');\r\n      return;\r\n    }\r\n\r\n    this.makeForwardChannelRequest_();\r\n    this.channelDebug_.debug('startForwardChannel_ finished, sent request');\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Establishes a new channel session with the the server.\r\n * @private\r\n */\r\nWebChannelBase.prototype.open_ = function() {\r\n  this.channelDebug_.debug('open_()');\r\n  this.nextRid_ = Math.floor(Math.random() * 100000);\r\n\r\n  var rid = this.nextRid_++;\r\n  var request =\r\n      ChannelRequest.createChannelRequest(this, this.channelDebug_, '', rid);\r\n\r\n  // mix the init headers\r\n  var extraHeaders = this.extraHeaders_;\r\n  if (this.initHeaders_) {\r\n    if (extraHeaders) {\r\n      extraHeaders = goog.object.clone(extraHeaders);\r\n      goog.object.extend(extraHeaders, this.initHeaders_);\r\n    } else {\r\n      extraHeaders = this.initHeaders_;\r\n    }\r\n  }\r\n\r\n  if (this.httpHeadersOverwriteParam_ === null) {\r\n    request.setExtraHeaders(extraHeaders);\r\n  }\r\n\r\n  var requestText = this.dequeueOutgoingMaps_(\r\n      request,\r\n      this.fastHandshake_ ? this.getMaxNumMessagesForFastHandshake_() :\r\n                            WebChannelBase.MAX_MAPS_PER_REQUEST_);\r\n\r\n  var uri = this.forwardChannelUri_.clone();\r\n  uri.setParameterValue('RID', rid);\r\n\r\n  if (this.clientVersion_ > 0) {\r\n    uri.setParameterValue('CVER', this.clientVersion_);\r\n  }\r\n\r\n  // http-session-id to be generated as the response\r\n  if (this.getBackgroundChannelTest() && this.getHttpSessionIdParam()) {\r\n    uri.setParameterValue(\r\n        WebChannel.X_HTTP_SESSION_ID, this.getHttpSessionIdParam());\r\n  }\r\n\r\n  // Add the reconnect parameters.\r\n  this.addAdditionalParams_(uri);\r\n\r\n  if (this.httpHeadersOverwriteParam_ && extraHeaders) {\r\n    httpCors.setHttpHeadersWithOverwriteParam(\r\n        uri, this.httpHeadersOverwriteParam_, extraHeaders);\r\n  }\r\n\r\n  this.forwardChannelRequestPool_.addRequest(request);\r\n\r\n  // Check the option and use GET to enable QUIC 0-RTT\r\n  if (this.fastHandshake_) {\r\n    uri.setParameterValue('$req', requestText);\r\n\r\n    // enable handshake upgrade\r\n    uri.setParameterValue('SID', 'null');\r\n    request.setDecodeInitialResponse();\r\n\r\n    request.xmlHttpPost(uri, null, true);  // Send as a GET\r\n  } else {\r\n    request.xmlHttpPost(uri, requestText, true);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {number} The number of raw JSON messages to be encoded\r\n * with the fast-handshake (GET) request, including zero. If messages are not\r\n * encoded as raw JSON data, return WebChannelBase.MAX_MAPS_PER_REQUEST_\r\n * @private\r\n */\r\nWebChannelBase.prototype.getMaxNumMessagesForFastHandshake_ = function() {\r\n  var total = 0;\r\n  for (var i = 0; i < this.outgoingMaps_.length; i++) {\r\n    var map = this.outgoingMaps_[i];\r\n    var size = map.getRawDataSize();\r\n    if (size === undefined) {\r\n      break;\r\n    }\r\n    total += size;\r\n\r\n    if (total > WebChannelBase.MAX_CHARS_PER_GET_) {\r\n      return i;\r\n    }\r\n\r\n    if (total === WebChannelBase.MAX_CHARS_PER_GET_ ||\r\n        i === this.outgoingMaps_.length - 1) {\r\n      return i + 1;\r\n    }\r\n  }\r\n\r\n  return WebChannelBase.MAX_MAPS_PER_REQUEST_;\r\n};\r\n\r\n\r\n\r\n/**\r\n * Makes a forward channel request using XMLHTTP.\r\n * @param {!ChannelRequest=} opt_retryRequest A failed request to retry.\r\n * @private\r\n */\r\nWebChannelBase.prototype.makeForwardChannelRequest_ = function(\r\n    opt_retryRequest) {\r\n  var rid;\r\n  if (opt_retryRequest) {\r\n    rid = opt_retryRequest.getRequestId();  // Reuse the same RID for a retry\r\n  } else {\r\n    rid = this.nextRid_++;\r\n  }\r\n\r\n  var uri = this.forwardChannelUri_.clone();\r\n  uri.setParameterValue('SID', this.sid_);\r\n  uri.setParameterValue('RID', rid);\r\n  uri.setParameterValue('AID', this.lastArrayId_);\r\n  // Add the additional reconnect parameters.\r\n  this.addAdditionalParams_(uri);\r\n\r\n  if (this.httpHeadersOverwriteParam_ && this.extraHeaders_) {\r\n    httpCors.setHttpHeadersWithOverwriteParam(\r\n        uri, this.httpHeadersOverwriteParam_, this.extraHeaders_);\r\n  }\r\n\r\n  var request = ChannelRequest.createChannelRequest(\r\n      this, this.channelDebug_, this.sid_, rid,\r\n      this.forwardChannelRetryCount_ + 1);\r\n\r\n  if (this.httpHeadersOverwriteParam_ === null) {\r\n    request.setExtraHeaders(this.extraHeaders_);\r\n  }\r\n\r\n  var requestText;\r\n  if (opt_retryRequest) {\r\n    this.requeuePendingMaps_(opt_retryRequest);\r\n  }\r\n  requestText =\r\n      this.dequeueOutgoingMaps_(request, WebChannelBase.MAX_MAPS_PER_REQUEST_);\r\n\r\n  // Randomize from 50%-100% of the forward channel timeout to avoid\r\n  // a big hit if servers happen to die at once.\r\n  request.setTimeout(\r\n      Math.round(this.forwardChannelRequestTimeoutMs_ * 0.50) +\r\n      Math.round(this.forwardChannelRequestTimeoutMs_ * 0.50 * Math.random()));\r\n  this.forwardChannelRequestPool_.addRequest(request);\r\n  request.xmlHttpPost(uri, requestText, true);\r\n};\r\n\r\n\r\n/**\r\n * Adds the additional parameters from the handler to the given URI.\r\n * @param {!goog.Uri} uri The URI to add the parameters to.\r\n * @private\r\n */\r\nWebChannelBase.prototype.addAdditionalParams_ = function(uri) {\r\n  // Add the additional reconnect parameters as needed.\r\n  if (this.handler_) {\r\n    var params = this.handler_.getAdditionalParams(this);\r\n    if (params) {\r\n      goog.structs.forEach(params, function(value, key, coll) {\r\n        uri.setParameterValue(key, value);\r\n      });\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Returns the request text from the outgoing maps and resets it.\r\n * @param {!ChannelRequest} request The new request for sending the messages.\r\n * @param {number} maxNum The maximum number of messages to be encoded\r\n * @return {string} The encoded request text created from all the currently\r\n *                  queued outgoing maps.\r\n * @private\r\n */\r\nWebChannelBase.prototype.dequeueOutgoingMaps_ = function(request, maxNum) {\r\n  var count = Math.min(this.outgoingMaps_.length, maxNum);\r\n\r\n  var badMapHandler = this.handler_ ?\r\n      goog.bind(this.handler_.badMapError, this.handler_, this) :\r\n      null;\r\n  var result = this.wireCodec_.encodeMessageQueue(\r\n      this.outgoingMaps_, count, badMapHandler);\r\n\r\n  request.setPendingMessages(this.outgoingMaps_.splice(0, count));\r\n\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * Requeues unacknowledged sent arrays for retransmission in the next forward\r\n * channel request.\r\n * @param {!ChannelRequest} retryRequest A failed request to retry.\r\n * @private\r\n */\r\nWebChannelBase.prototype.requeuePendingMaps_ = function(retryRequest) {\r\n  this.outgoingMaps_ =\r\n      retryRequest.getPendingMessages().concat(this.outgoingMaps_);\r\n};\r\n\r\n\r\n/**\r\n * Ensures there is a backchannel request for receiving data from the server.\r\n * @private\r\n */\r\nWebChannelBase.prototype.ensureBackChannel_ = function() {\r\n  if (this.backChannelRequest_) {\r\n    // already have one\r\n    return;\r\n  }\r\n\r\n  if (this.backChannelTimerId_) {\r\n    // no need to start a new request - one is already scheduled\r\n    return;\r\n  }\r\n\r\n  this.backChannelAttemptId_ = 1;\r\n\r\n  // Use async.run instead of setTimeout(0) to avoid the 1s message delay\r\n  // from chrome/firefox background tabs\r\n  // backChannelTimerId_ stays unset, as with setTimeout(0)\r\n  goog.async.run(this.onStartBackChannelTimer_, this);\r\n\r\n  this.backChannelRetryCount_ = 0;\r\n};\r\n\r\n\r\n/**\r\n * Schedules a back-channel retry, unless the max retries has been reached.\r\n * @return {boolean} true iff a retry was scheduled.\r\n * @private\r\n */\r\nWebChannelBase.prototype.maybeRetryBackChannel_ = function() {\r\n  if (this.backChannelRequest_ || this.backChannelTimerId_) {\r\n    // Should be impossible to be called in this state.\r\n    this.channelDebug_.severe('Request already in progress');\r\n    return false;\r\n  }\r\n\r\n  if (this.backChannelRetryCount_ >= this.getBackChannelMaxRetries()) {\r\n    return false;\r\n  }\r\n\r\n  this.channelDebug_.debug('Going to retry GET');\r\n\r\n  this.backChannelAttemptId_++;\r\n  this.backChannelTimerId_ = requestStats.setTimeout(\r\n      goog.bind(this.onStartBackChannelTimer_, this),\r\n      this.getRetryTime_(this.backChannelRetryCount_));\r\n  this.backChannelRetryCount_++;\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * Timer callback for ensureBackChannel_.\r\n * @private\r\n */\r\nWebChannelBase.prototype.onStartBackChannelTimer_ = function() {\r\n  this.backChannelTimerId_ = null;\r\n  this.startBackChannel_();\r\n};\r\n\r\n\r\n/**\r\n * Begins a new back channel operation to the server.\r\n * @private\r\n */\r\nWebChannelBase.prototype.startBackChannel_ = function() {\r\n  if (!this.okToMakeRequest_()) {\r\n    // channel is cancelled\r\n    return;\r\n  }\r\n\r\n  this.channelDebug_.debug('Creating new HttpRequest');\r\n  this.backChannelRequest_ = ChannelRequest.createChannelRequest(\r\n      this, this.channelDebug_, this.sid_, 'rpc', this.backChannelAttemptId_);\r\n\r\n  if (this.httpHeadersOverwriteParam_ === null) {\r\n    this.backChannelRequest_.setExtraHeaders(this.extraHeaders_);\r\n  }\r\n\r\n  this.backChannelRequest_.setReadyStateChangeThrottle(\r\n      this.readyStateChangeThrottleMs_);\r\n  var uri = this.backChannelUri_.clone();\r\n  uri.setParameterValue('RID', 'rpc');\r\n  uri.setParameterValue('SID', this.sid_);\r\n  uri.setParameterValue('CI', this.useChunked_ ? '0' : '1');\r\n  uri.setParameterValue('AID', this.lastArrayId_);\r\n\r\n  // Add the reconnect parameters.\r\n  this.addAdditionalParams_(uri);\r\n\r\n  uri.setParameterValue('TYPE', 'xmlhttp');\r\n\r\n  if (this.httpHeadersOverwriteParam_ && this.extraHeaders_) {\r\n    httpCors.setHttpHeadersWithOverwriteParam(\r\n        uri, this.httpHeadersOverwriteParam_, this.extraHeaders_);\r\n  }\r\n\r\n  if (this.backChannelRequestTimeoutMs_) {\r\n    this.backChannelRequest_.setTimeout(this.backChannelRequestTimeoutMs_);\r\n  }\r\n\r\n  this.backChannelRequest_.xmlHttpGet(\r\n      uri, true /* decodeChunks */, this.hostPrefix_);\r\n\r\n  this.channelDebug_.debug('New Request created');\r\n};\r\n\r\n\r\n/**\r\n * Gives the handler a chance to return an error code and stop channel\r\n * execution. A handler might want to do this to check that the user is still\r\n * logged in, for example.\r\n * @private\r\n * @return {boolean} If it's OK to make a request.\r\n */\r\nWebChannelBase.prototype.okToMakeRequest_ = function() {\r\n  if (this.handler_) {\r\n    var result = this.handler_.okToMakeRequest(this);\r\n    if (result != WebChannelBase.Error.OK) {\r\n      this.channelDebug_.debug(\r\n          'Handler returned error code from okToMakeRequest');\r\n      this.signalError_(result);\r\n      return false;\r\n    }\r\n  }\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.testConnectionFinished = function(\r\n    testChannel, useChunked) {\r\n  this.channelDebug_.debug('Test Connection Finished');\r\n\r\n  // Forward channel will not be used prior to this method is called\r\n  var clientProtocol = testChannel.getClientProtocol();\r\n  if (clientProtocol) {\r\n    this.forwardChannelRequestPool_.applyClientProtocol(clientProtocol);\r\n  }\r\n\r\n  this.useChunked_ = this.allowChunkedMode_ && useChunked;\r\n  this.lastStatusCode_ = testChannel.getLastStatusCode();\r\n\r\n  this.connectChannel_();\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.testConnectionFailure = function(\r\n    testChannel, errorCode) {\r\n  this.channelDebug_.debug('Test Connection Failed');\r\n  this.lastStatusCode_ = testChannel.getLastStatusCode();\r\n  this.signalError_(WebChannelBase.Error.REQUEST_FAILED);\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.onRequestData = function(request, responseText) {\r\n  if (this.state_ == WebChannelBase.State.CLOSED ||\r\n      (this.backChannelRequest_ != request &&\r\n       !this.forwardChannelRequestPool_.hasRequest(request))) {\r\n    // either CLOSED or a request we don't know about (perhaps an old request)\r\n    return;\r\n  }\r\n  this.lastStatusCode_ = request.getLastStatusCode();\r\n\r\n  // first to check if request has been upgraded to backchannel\r\n  if (!request.isInitialResponseDecoded() &&\r\n      this.forwardChannelRequestPool_.hasRequest(request) &&\r\n      this.state_ == WebChannelBase.State.OPENED) {\r\n    var response;\r\n    try {\r\n      response = this.wireCodec_.decodeMessage(responseText);\r\n    } catch (ex) {\r\n      response = null;\r\n    }\r\n    if (goog.isArray(response) && response.length == 3) {\r\n      this.handlePostResponse_(/** @type {!Array<?>} */ (response), request);\r\n      this.onForwardChannelFlushed_();\r\n    } else {\r\n      this.channelDebug_.debug('Bad POST response data returned');\r\n      this.signalError_(WebChannelBase.Error.BAD_RESPONSE);\r\n    }\r\n  } else {\r\n    if (request.isInitialResponseDecoded() ||\r\n        this.backChannelRequest_ == request) {\r\n      this.clearDeadBackchannelTimer_();\r\n    }\r\n    if (!goog.string.isEmptyOrWhitespace(responseText)) {\r\n      var response = this.wireCodec_.decodeMessage(responseText);\r\n      this.onInput_(/** @type {!Array<?>} */ (response), request);\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Checks if we need call the flush callback.\r\n *\r\n * @private\r\n */\r\nWebChannelBase.prototype.onForwardChannelFlushed_ = function() {\r\n  if (this.forwardChannelRequestPool_.getRequestCount() <= 1) {\r\n    if (this.forwardChannelFlushedCallback_) {\r\n      try {\r\n        this.forwardChannelFlushedCallback_();\r\n      } catch (ex) {\r\n        this.channelDebug_.dumpException(\r\n            ex, 'Exception from forwardChannelFlushedCallback_ ');\r\n      }\r\n      // reset\r\n      this.forwardChannelFlushedCallback_ = undefined;\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Handles a POST response from the server.\r\n * @param {Array<number>} responseValues The key value pairs in\r\n *     the POST response.\r\n * @param {!ChannelRequest} forwardReq The forward channel request that\r\n * triggers this function call.\r\n * @private\r\n */\r\nWebChannelBase.prototype.handlePostResponse_ = function(\r\n    responseValues, forwardReq) {\r\n  // The first response value is set to 0 if server is missing backchannel.\r\n  if (responseValues[0] == 0) {\r\n    this.handleBackchannelMissing_(forwardReq);\r\n    return;\r\n  }\r\n  this.lastPostResponseArrayId_ = responseValues[1];\r\n  var outstandingArrays = this.lastPostResponseArrayId_ - this.lastArrayId_;\r\n  if (0 < outstandingArrays) {\r\n    var numOutstandingBackchannelBytes = responseValues[2];\r\n    this.channelDebug_.debug(\r\n        numOutstandingBackchannelBytes + ' bytes (in ' + outstandingArrays +\r\n        ' arrays) are outstanding on the BackChannel');\r\n    if (!this.shouldRetryBackChannel_(numOutstandingBackchannelBytes)) {\r\n      return;\r\n    }\r\n    if (!this.deadBackChannelTimerId_) {\r\n      // We expect to receive data within 2 RTTs or we retry the backchannel.\r\n      this.deadBackChannelTimerId_ = requestStats.setTimeout(\r\n          goog.bind(this.onBackChannelDead_, this),\r\n          2 * WebChannelBase.RTT_ESTIMATE);\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Handles a POST response from the server telling us that it has detected that\r\n * we have no hanging GET connection.\r\n * @param {!ChannelRequest} forwardReq The forward channel request that\r\n * triggers this function call.\r\n * @private\r\n */\r\nWebChannelBase.prototype.handleBackchannelMissing_ = function(forwardReq) {\r\n  // As long as the back channel was started before the POST was sent,\r\n  // we should retry the backchannel. We give a slight buffer of RTT_ESTIMATE\r\n  // so as not to excessively retry the backchannel\r\n  this.channelDebug_.debug('Server claims our backchannel is missing.');\r\n  if (this.backChannelTimerId_) {\r\n    this.channelDebug_.debug('But we are currently starting the request.');\r\n    return;\r\n  } else if (!this.backChannelRequest_) {\r\n    this.channelDebug_.warning('We do not have a BackChannel established');\r\n  } else if (\r\n      this.backChannelRequest_.getRequestStartTime() +\r\n          WebChannelBase.RTT_ESTIMATE <\r\n      forwardReq.getRequestStartTime()) {\r\n    this.clearDeadBackchannelTimer_();\r\n    this.backChannelRequest_.cancel();\r\n    this.backChannelRequest_ = null;\r\n  } else {\r\n    return;\r\n  }\r\n  this.maybeRetryBackChannel_();\r\n  requestStats.notifyStatEvent(requestStats.Stat.BACKCHANNEL_MISSING);\r\n};\r\n\r\n\r\n/**\r\n * Determines whether we should start the process of retrying a possibly\r\n * dead backchannel.\r\n * @param {number} outstandingBytes The number of bytes for which the server has\r\n *     not yet received acknowledgement.\r\n * @return {boolean} Whether to start the backchannel retry timer.\r\n * @private\r\n */\r\nWebChannelBase.prototype.shouldRetryBackChannel_ = function(outstandingBytes) {\r\n  // Not too many outstanding bytes, not buffered and not after a retry.\r\n  return outstandingBytes <\r\n      WebChannelBase.OUTSTANDING_DATA_BACKCHANNEL_RETRY_CUTOFF &&\r\n      !this.isBuffered() && this.backChannelRetryCount_ == 0;\r\n};\r\n\r\n\r\n/**\r\n * Decides which host prefix should be used, if any.  If there is a handler,\r\n * allows the handler to validate a host prefix provided by the server, and\r\n * optionally override it.\r\n * @param {?string} serverHostPrefix The host prefix provided by the server.\r\n * @return {?string} The host prefix to actually use, if any. Will return null\r\n *     if the use of host prefixes was disabled via setAllowHostPrefix().\r\n * @override\r\n */\r\nWebChannelBase.prototype.correctHostPrefix = function(serverHostPrefix) {\r\n  if (this.allowHostPrefix_) {\r\n    if (this.handler_) {\r\n      return this.handler_.correctHostPrefix(serverHostPrefix);\r\n    }\r\n    return serverHostPrefix;\r\n  }\r\n  return null;\r\n};\r\n\r\n\r\n/**\r\n * Handles the timer that indicates that our backchannel is no longer able to\r\n * successfully receive data from the server.\r\n * @private\r\n */\r\nWebChannelBase.prototype.onBackChannelDead_ = function() {\r\n  if (goog.isDefAndNotNull(this.deadBackChannelTimerId_)) {\r\n    this.deadBackChannelTimerId_ = null;\r\n    this.backChannelRequest_.cancel();\r\n    this.backChannelRequest_ = null;\r\n    this.maybeRetryBackChannel_();\r\n    requestStats.notifyStatEvent(requestStats.Stat.BACKCHANNEL_DEAD);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Clears the timer that indicates that our backchannel is no longer able to\r\n * successfully receive data from the server.\r\n * @private\r\n */\r\nWebChannelBase.prototype.clearDeadBackchannelTimer_ = function() {\r\n  if (goog.isDefAndNotNull(this.deadBackChannelTimerId_)) {\r\n    goog.global.clearTimeout(this.deadBackChannelTimerId_);\r\n    this.deadBackChannelTimerId_ = null;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Returns whether or not the given error/status combination is fatal or not.\r\n * On fatal errors we immediately close the session rather than retrying the\r\n * failed request.\r\n * @param {?ChannelRequest.Error} error The error code for the\r\n * failed request.\r\n * @param {number} statusCode The last HTTP status code.\r\n * @return {boolean} Whether or not the error is fatal.\r\n * @private\r\n */\r\nWebChannelBase.isFatalError_ = function(error, statusCode) {\r\n  return error == ChannelRequest.Error.UNKNOWN_SESSION_ID ||\r\n      (error == ChannelRequest.Error.STATUS && statusCode > 0);\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.onRequestComplete = function(request) {\r\n  this.channelDebug_.debug('Request complete');\r\n  var type;\r\n  var pendingMessages = null;\r\n  if (this.backChannelRequest_ == request) {\r\n    this.clearDeadBackchannelTimer_();\r\n    this.backChannelRequest_ = null;\r\n    type = WebChannelBase.ChannelType_.BACK_CHANNEL;\r\n  } else if (this.forwardChannelRequestPool_.hasRequest(request)) {\r\n    pendingMessages = request.getPendingMessages();\r\n    this.forwardChannelRequestPool_.removeRequest(request);\r\n    type = WebChannelBase.ChannelType_.FORWARD_CHANNEL;\r\n  } else {\r\n    // return if it was an old request from a previous session\r\n    return;\r\n  }\r\n\r\n  this.lastStatusCode_ = request.getLastStatusCode();\r\n\r\n  if (this.state_ == WebChannelBase.State.CLOSED) {\r\n    return;\r\n  }\r\n\r\n  if (request.getSuccess()) {\r\n    // Yay!\r\n    if (type == WebChannelBase.ChannelType_.FORWARD_CHANNEL) {\r\n      var size = request.getPostData() ? request.getPostData().length : 0;\r\n      requestStats.notifyTimingEvent(\r\n          size, goog.now() - request.getRequestStartTime(),\r\n          this.forwardChannelRetryCount_);\r\n      this.ensureForwardChannel_();\r\n      this.onSuccess_(request);\r\n    } else {  // i.e., back-channel\r\n      this.ensureBackChannel_();\r\n    }\r\n    return;\r\n  }\r\n  // Else unsuccessful. Fall through.\r\n\r\n  var lastError = request.getLastError();\r\n  if (!WebChannelBase.isFatalError_(lastError, this.lastStatusCode_)) {\r\n    // Maybe retry.\r\n    var self = this;\r\n    this.channelDebug_.debug(function() {\r\n      return 'Maybe retrying, last error: ' +\r\n          ChannelRequest.errorStringFromCode(lastError, self.lastStatusCode_);\r\n    });\r\n    if (type == WebChannelBase.ChannelType_.FORWARD_CHANNEL) {\r\n      if (this.maybeRetryForwardChannel_(request)) {\r\n        return;\r\n      }\r\n    }\r\n    if (type == WebChannelBase.ChannelType_.BACK_CHANNEL) {\r\n      if (this.maybeRetryBackChannel_()) {\r\n        return;\r\n      }\r\n    }\r\n    // Else exceeded max retries. Fall through.\r\n    this.channelDebug_.debug('Exceeded max number of retries');\r\n  } else {\r\n    // Else fatal error. Fall through and mark the pending maps as failed.\r\n    this.channelDebug_.debug('Not retrying due to error type');\r\n  }\r\n\r\n\r\n  // Abort the channel now\r\n\r\n  // Record pending messages from the failed request\r\n  if (pendingMessages && pendingMessages.length > 0) {\r\n    this.forwardChannelRequestPool_.addPendingMessages(pendingMessages);\r\n  }\r\n\r\n  this.channelDebug_.debug('Error: HTTP request failed');\r\n  switch (lastError) {\r\n    case ChannelRequest.Error.NO_DATA:\r\n      this.signalError_(WebChannelBase.Error.NO_DATA);\r\n      break;\r\n    case ChannelRequest.Error.BAD_DATA:\r\n      this.signalError_(WebChannelBase.Error.BAD_DATA);\r\n      break;\r\n    case ChannelRequest.Error.UNKNOWN_SESSION_ID:\r\n      this.signalError_(WebChannelBase.Error.UNKNOWN_SESSION_ID);\r\n      break;\r\n    default:\r\n      this.signalError_(WebChannelBase.Error.REQUEST_FAILED);\r\n      break;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @param {number} retryCount Number of retries so far.\r\n * @return {number} Time in ms before firing next retry request.\r\n * @private\r\n */\r\nWebChannelBase.prototype.getRetryTime_ = function(retryCount) {\r\n  var retryTime = this.baseRetryDelayMs_ +\r\n      Math.floor(Math.random() * this.retryDelaySeedMs_);\r\n  if (!this.isActive()) {\r\n    this.channelDebug_.debug('Inactive channel');\r\n    retryTime = retryTime * WebChannelBase.INACTIVE_CHANNEL_RETRY_FACTOR;\r\n  }\r\n  // Backoff for subsequent retries\r\n  retryTime *= retryCount;\r\n  return retryTime;\r\n};\r\n\r\n\r\n/**\r\n * @param {number} baseDelayMs The base part of the retry delay, in ms.\r\n * @param {number} delaySeedMs A random delay between 0 and this is added to\r\n *     the base part.\r\n */\r\nWebChannelBase.prototype.setRetryDelay = function(baseDelayMs, delaySeedMs) {\r\n  this.baseRetryDelayMs_ = baseDelayMs;\r\n  this.retryDelaySeedMs_ = delaySeedMs;\r\n};\r\n\r\n\r\n/**\r\n * Apply any handshake control headers.\r\n * @param {!ChannelRequest} request The underlying request object\r\n * @private\r\n */\r\nWebChannelBase.prototype.applyControlHeaders_ = function(request) {\r\n  if (!this.backgroundChannelTest_) {\r\n    return;\r\n  }\r\n\r\n  var xhr = request.getXhr();\r\n  if (xhr) {\r\n    var clientProtocol =\r\n        xhr.getStreamingResponseHeader(WebChannel.X_CLIENT_WIRE_PROTOCOL);\r\n    if (clientProtocol) {\r\n      this.forwardChannelRequestPool_.applyClientProtocol(clientProtocol);\r\n    }\r\n\r\n    if (this.getHttpSessionIdParam()) {\r\n      var httpSessionIdHeader =\r\n          xhr.getStreamingResponseHeader(WebChannel.X_HTTP_SESSION_ID);\r\n      if (httpSessionIdHeader) {\r\n        this.setHttpSessionId(httpSessionIdHeader);\r\n        // update the cached uri\r\n        var httpSessionIdParam = this.getHttpSessionIdParam();\r\n\r\n        this.forwardChannelUri_.setParameterValue(\r\n            /** @type {string} */ (httpSessionIdParam),  // never null\r\n            httpSessionIdHeader);\r\n      } else {\r\n        this.channelDebug_.warning(\r\n            'Missing X_HTTP_SESSION_ID in the handshake response');\r\n      }\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Processes the data returned by the server.\r\n * @param {!Array<!Array<?>>} respArray The response array returned\r\n *     by the server.\r\n * @param {!ChannelRequest} request The underlying request object\r\n * @private\r\n */\r\nWebChannelBase.prototype.onInput_ = function(respArray, request) {\r\n  var batch =\r\n      this.handler_ && this.handler_.channelHandleMultipleArrays ? [] : null;\r\n  for (var i = 0; i < respArray.length; i++) {\r\n    var nextArray = respArray[i];\r\n    this.lastArrayId_ = nextArray[0];\r\n    nextArray = nextArray[1];\r\n    if (this.state_ == WebChannelBase.State.OPENING) {\r\n      if (nextArray[0] == 'c') {\r\n        this.sid_ = nextArray[1];\r\n        this.hostPrefix_ = this.correctHostPrefix(nextArray[2]);\r\n\r\n        var negotiatedVersion = nextArray[3];\r\n        if (goog.isDefAndNotNull(negotiatedVersion)) {\r\n          this.channelVersion_ = negotiatedVersion;\r\n          this.channelDebug_.info('VER=' + this.channelVersion_);\r\n        }\r\n\r\n        var negotiatedServerVersion = nextArray[4];\r\n        if (goog.isDefAndNotNull(negotiatedServerVersion)) {\r\n          this.serverVersion_ = negotiatedServerVersion;\r\n          this.channelDebug_.info('SVER=' + this.serverVersion_);\r\n        }\r\n\r\n        // CVER=22\r\n        var serverKeepaliveMs = nextArray[5];\r\n        if (goog.isDefAndNotNull(serverKeepaliveMs) &&\r\n            goog.isNumber(serverKeepaliveMs) && serverKeepaliveMs > 0) {\r\n          var timeout = 1.5 * serverKeepaliveMs;\r\n          this.backChannelRequestTimeoutMs_ = timeout;\r\n          this.channelDebug_.info('backChannelRequestTimeoutMs_=' + timeout);\r\n        }\r\n\r\n        this.applyControlHeaders_(request);\r\n\r\n        this.state_ = WebChannelBase.State.OPENED;\r\n        if (this.handler_) {\r\n          this.handler_.channelOpened(this);\r\n        }\r\n\r\n        this.startBackchannelAfterHandshake_(request);\r\n\r\n        if (this.outgoingMaps_.length > 0) {\r\n          this.ensureForwardChannel_();\r\n        }\r\n      } else if (nextArray[0] == 'stop' || nextArray[0] == 'close') {\r\n        // treat close also as an abort\r\n        this.signalError_(WebChannelBase.Error.STOP);\r\n      }\r\n    } else if (this.state_ == WebChannelBase.State.OPENED) {\r\n      if (nextArray[0] == 'stop' || nextArray[0] == 'close') {\r\n        if (batch && !goog.array.isEmpty(batch)) {\r\n          this.handler_.channelHandleMultipleArrays(this, batch);\r\n          batch.length = 0;\r\n        }\r\n        if (nextArray[0] == 'stop') {\r\n          this.signalError_(WebChannelBase.Error.STOP);\r\n        } else {\r\n          this.disconnect();\r\n        }\r\n      } else if (nextArray[0] == 'noop') {\r\n        // ignore - noop to keep connection happy\r\n      } else {\r\n        if (batch) {\r\n          batch.push(nextArray);\r\n        } else if (this.handler_) {\r\n          this.handler_.channelHandleArray(this, nextArray);\r\n        }\r\n      }\r\n      // We have received useful data on the back-channel, so clear its retry\r\n      // count. We do this because back-channels by design do not complete\r\n      // quickly, so on a flaky connection we could have many fail to complete\r\n      // fully but still deliver a lot of data before they fail. We don't want\r\n      // to count such failures towards the retry limit, because we don't want\r\n      // to give up on a session if we can still receive data.\r\n      this.backChannelRetryCount_ = 0;\r\n    }\r\n  }\r\n  if (batch && !goog.array.isEmpty(batch)) {\r\n    this.handler_.channelHandleMultipleArrays(this, batch);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Starts the backchannel after the handshake.\r\n *\r\n * @param {!ChannelRequest} request The underlying request object\r\n * @private\r\n */\r\nWebChannelBase.prototype.startBackchannelAfterHandshake_ = function(request) {\r\n  this.backChannelUri_ = this.getBackChannelUri(\r\n      this.hostPrefix_, /** @type {string} */ (this.path_));\r\n\r\n  if (request.isInitialResponseDecoded()) {\r\n    this.channelDebug_.debug('Upgrade the handshake request to a backchannel.');\r\n    this.forwardChannelRequestPool_.removeRequest(request);\r\n    request.resetTimeout(this.backChannelRequestTimeoutMs_);\r\n    this.backChannelRequest_ = request;\r\n  } else {\r\n    // Open connection to receive data\r\n    this.ensureBackChannel_();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Helper to ensure the channel is in the expected state.\r\n * @param {...number} var_args The channel must be in one of the indicated\r\n *     states.\r\n * @private\r\n */\r\nWebChannelBase.prototype.ensureInState_ = function(var_args) {\r\n  goog.asserts.assert(\r\n      goog.array.contains(arguments, this.state_),\r\n      'Unexpected channel state: %s', this.state_);\r\n};\r\n\r\n\r\n/**\r\n * Signals an error has occurred.\r\n * @param {WebChannelBase.Error} error The error code for the failure.\r\n * @private\r\n */\r\nWebChannelBase.prototype.signalError_ = function(error) {\r\n  this.channelDebug_.info('Error code ' + error);\r\n  if (error == WebChannelBase.Error.REQUEST_FAILED) {\r\n    // Create a separate Internet connection to check\r\n    // if it's a server error or user's network error.\r\n    var imageUri = null;\r\n    if (this.handler_) {\r\n      imageUri = this.handler_.getNetworkTestImageUri(this);\r\n    }\r\n    netUtils.testNetwork(goog.bind(this.testNetworkCallback_, this), imageUri);\r\n  } else {\r\n    requestStats.notifyStatEvent(requestStats.Stat.ERROR_OTHER);\r\n  }\r\n  this.onError_(error);\r\n};\r\n\r\n\r\n/**\r\n * Callback for netUtils.testNetwork during error handling.\r\n * @param {boolean} networkUp Whether the network is up.\r\n * @private\r\n */\r\nWebChannelBase.prototype.testNetworkCallback_ = function(networkUp) {\r\n  if (networkUp) {\r\n    this.channelDebug_.info('Successfully pinged google.com');\r\n    requestStats.notifyStatEvent(requestStats.Stat.ERROR_OTHER);\r\n  } else {\r\n    this.channelDebug_.info('Failed to ping google.com');\r\n    requestStats.notifyStatEvent(requestStats.Stat.ERROR_NETWORK);\r\n    // Do not call onError_ again to eliminate duplicated Error events.\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Called when messages have been successfully sent from the queue.\r\n * @param {!ChannelRequest} request The request object\r\n * @private\r\n */\r\nWebChannelBase.prototype.onSuccess_ = function(request) {\r\n  if (this.handler_) {\r\n    this.handler_.channelSuccess(this, request);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Called when we've determined the final error for a channel. It closes the\r\n * notifiers the handler of the error and closes the channel.\r\n * @param {WebChannelBase.Error} error  The error code for the failure.\r\n * @private\r\n */\r\nWebChannelBase.prototype.onError_ = function(error) {\r\n  this.channelDebug_.debug('HttpChannel: error - ' + error);\r\n  this.state_ = WebChannelBase.State.CLOSED;\r\n  if (this.handler_) {\r\n    this.handler_.channelError(this, error);\r\n  }\r\n  this.onClose_();\r\n  this.cancelRequests_();\r\n};\r\n\r\n\r\n/**\r\n * Called when the channel has been closed. It notifiers the handler of the\r\n * event, and reports any pending or undelivered maps.\r\n * @private\r\n */\r\nWebChannelBase.prototype.onClose_ = function() {\r\n  this.state_ = WebChannelBase.State.CLOSED;\r\n  this.lastStatusCode_ = -1;\r\n  if (this.handler_) {\r\n    var pendingMessages = this.forwardChannelRequestPool_.getPendingMessages();\r\n\r\n    if (pendingMessages.length == 0 && this.outgoingMaps_.length == 0) {\r\n      this.handler_.channelClosed(this);\r\n    } else {\r\n      var self = this;\r\n      this.channelDebug_.debug(function() {\r\n        return 'Number of undelivered maps' +\r\n            ', pending: ' + pendingMessages.length +\r\n            ', outgoing: ' + self.outgoingMaps_.length;\r\n      });\r\n\r\n      this.forwardChannelRequestPool_.clearPendingMessages();\r\n\r\n      var copyOfUndeliveredMaps = goog.array.clone(this.outgoingMaps_);\r\n      this.outgoingMaps_.length = 0;\r\n\r\n      this.handler_.channelClosed(this, pendingMessages, copyOfUndeliveredMaps);\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.getForwardChannelUri = function(path) {\r\n  var uri = this.createDataUri(null, path);\r\n  this.channelDebug_.debug('GetForwardChannelUri: ' + uri);\r\n  return uri;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.getConnectionState = function() {\r\n  return this.connState_;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.getBackChannelUri = function(hostPrefix, path) {\r\n  var uri = this.createDataUri(\r\n      this.shouldUseSecondaryDomains() ? hostPrefix : null, path);\r\n  this.channelDebug_.debug('GetBackChannelUri: ' + uri);\r\n  return uri;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.createDataUri = function(\r\n    hostPrefix, path, opt_overridePort) {\r\n  var uri = goog.Uri.parse(path);\r\n  var uriAbsolute = (uri.getDomain() != '');\r\n  if (uriAbsolute) {\r\n    if (hostPrefix) {\r\n      uri.setDomain(hostPrefix + '.' + uri.getDomain());\r\n    }\r\n\r\n    uri.setPort(opt_overridePort || uri.getPort());\r\n  } else {\r\n    var locationPage = goog.global.location;\r\n    var hostName;\r\n    if (hostPrefix) {\r\n      hostName = hostPrefix + '.' + locationPage.hostname;\r\n    } else {\r\n      hostName = locationPage.hostname;\r\n    }\r\n\r\n    var port = opt_overridePort || +locationPage.port;\r\n\r\n    uri = goog.Uri.create(locationPage.protocol, null, hostName, port, path);\r\n  }\r\n\r\n  if (this.extraParams_) {\r\n    goog.object.forEach(this.extraParams_, function(value, key) {\r\n      uri.setParameterValue(key, value);\r\n    });\r\n  }\r\n\r\n  var param = this.getHttpSessionIdParam();\r\n  var value = this.getHttpSessionId();\r\n  if (param && value) {\r\n    uri.setParameterValue(param, value);\r\n  }\r\n\r\n  // Add the protocol version to the URI.\r\n  uri.setParameterValue('VER', this.channelVersion_);\r\n\r\n  // Add the reconnect parameters.\r\n  this.addAdditionalParams_(uri);\r\n\r\n  return uri;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.createXhrIo = function(hostPrefix) {\r\n  if (hostPrefix && !this.supportsCrossDomainXhrs_) {\r\n    throw new Error('Can\\'t create secondary domain capable XhrIo object.');\r\n  }\r\n  var xhr = new goog.net.XhrIo(this.xmlHttpFactory_);\r\n  xhr.setWithCredentials(this.supportsCrossDomainXhrs_);\r\n  return xhr;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.isActive = function() {\r\n  return !!this.handler_ && this.handler_.isActive(this);\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBase.prototype.shouldUseSecondaryDomains = function() {\r\n  return this.supportsCrossDomainXhrs_;\r\n};\r\n\r\n\r\n/**\r\n * Sets (overwrites) the forward channel flush callback.\r\n *\r\n * @param {function()} callback The callback to be invoked.\r\n */\r\nWebChannelBase.prototype.setForwardChannelFlushCallback = function(callback) {\r\n  this.forwardChannelFlushedCallback_ = callback;\r\n};\r\n\r\n\r\n/**\r\n * A LogSaver that can be used to accumulate all the debug logs so they\r\n * can be sent to the server when a problem is detected.\r\n * @const\r\n */\r\nWebChannelBase.LogSaver = {};\r\n\r\n\r\n/**\r\n * Buffer for accumulating the debug log\r\n * @type {goog.structs.CircularBuffer}\r\n * @private\r\n */\r\nWebChannelBase.LogSaver.buffer_ = new goog.structs.CircularBuffer(1000);\r\n\r\n\r\n/**\r\n * Whether we're currently accumulating the debug log.\r\n * @type {boolean}\r\n * @private\r\n */\r\nWebChannelBase.LogSaver.enabled_ = false;\r\n\r\n\r\n/**\r\n * Formatter for saving logs.\r\n * @type {goog.debug.Formatter}\r\n * @private\r\n */\r\nWebChannelBase.LogSaver.formatter_ = new goog.debug.TextFormatter();\r\n\r\n\r\n/**\r\n * Returns whether the LogSaver is enabled.\r\n * @return {boolean} Whether saving is enabled or disabled.\r\n */\r\nWebChannelBase.LogSaver.isEnabled = function() {\r\n  return WebChannelBase.LogSaver.enabled_;\r\n};\r\n\r\n\r\n/**\r\n * Enables of disables the LogSaver.\r\n * @param {boolean} enable Whether to enable or disable saving.\r\n */\r\nWebChannelBase.LogSaver.setEnabled = function(enable) {\r\n  if (enable == WebChannelBase.LogSaver.enabled_) {\r\n    return;\r\n  }\r\n\r\n  var fn = WebChannelBase.LogSaver.addLogRecord;\r\n  var logger = goog.log.getLogger('goog.net');\r\n  if (enable) {\r\n    goog.log.addHandler(logger, fn);\r\n  } else {\r\n    goog.log.removeHandler(logger, fn);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Adds a log record.\r\n * @param {goog.log.LogRecord} logRecord the LogRecord.\r\n */\r\nWebChannelBase.LogSaver.addLogRecord = function(logRecord) {\r\n  WebChannelBase.LogSaver.buffer_.add(\r\n      WebChannelBase.LogSaver.formatter_.formatRecord(logRecord));\r\n};\r\n\r\n\r\n/**\r\n * Returns the log as a single string.\r\n * @return {string} The log as a single string.\r\n */\r\nWebChannelBase.LogSaver.getBuffer = function() {\r\n  return WebChannelBase.LogSaver.buffer_.getValues().join('');\r\n};\r\n\r\n\r\n/**\r\n * Clears the buffer\r\n */\r\nWebChannelBase.LogSaver.clearBuffer = function() {\r\n  WebChannelBase.LogSaver.buffer_.clear();\r\n};\r\n\r\n\r\n\r\n/**\r\n * Abstract base class for the channel handler\r\n * @constructor\r\n * @struct\r\n */\r\nWebChannelBase.Handler = function() {};\r\n\r\n\r\n/**\r\n * Callback handler for when a batch of response arrays is received from the\r\n * server. When null, batched dispatching is disabled.\r\n * @type {?function(!WebChannelBase, !Array<!Array<?>>)}\r\n */\r\nWebChannelBase.Handler.prototype.channelHandleMultipleArrays = null;\r\n\r\n\r\n/**\r\n * Whether it's okay to make a request to the server. A handler can return\r\n * false if the channel should fail. For example, if the user has logged out,\r\n * the handler may want all requests to fail immediately.\r\n * @param {WebChannelBase} channel The channel.\r\n * @return {WebChannelBase.Error} An error code. The code should\r\n * return WebChannelBase.Error.OK to indicate it's okay. Any other\r\n * error code will cause a failure.\r\n */\r\nWebChannelBase.Handler.prototype.okToMakeRequest = function(channel) {\r\n  return WebChannelBase.Error.OK;\r\n};\r\n\r\n\r\n/**\r\n * Indicates the WebChannel has successfully negotiated with the server\r\n * and can now send and receive data.\r\n * @param {WebChannelBase} channel The channel.\r\n */\r\nWebChannelBase.Handler.prototype.channelOpened = function(channel) {};\r\n\r\n\r\n/**\r\n * New input is available for the application to process.\r\n *\r\n * @param {WebChannelBase} channel The channel.\r\n * @param {Array<?>} array The data array.\r\n */\r\nWebChannelBase.Handler.prototype.channelHandleArray = function(\r\n    channel, array) {};\r\n\r\n\r\n/**\r\n * Indicates messages that have been successfully sent on the channel.\r\n *\r\n * @param {WebChannelBase} channel The channel.\r\n * @param {!ChannelRequest} request The request object that contains\r\n *     the pending messages that have been successfully delivered to the server.\r\n */\r\nWebChannelBase.Handler.prototype.channelSuccess = function(channel, request) {};\r\n\r\n\r\n/**\r\n * Indicates an error occurred on the WebChannel.\r\n *\r\n * @param {WebChannelBase} channel The channel.\r\n * @param {WebChannelBase.Error} error The error code.\r\n */\r\nWebChannelBase.Handler.prototype.channelError = function(channel, error) {};\r\n\r\n\r\n/**\r\n * Indicates the WebChannel is closed. Also notifies about which maps,\r\n * if any, that may not have been delivered to the server.\r\n * @param {WebChannelBase} channel The channel.\r\n * @param {Array<Wire.QueuedMap>=} opt_pendingMaps The\r\n *     array of pending maps, which may or may not have been delivered to the\r\n *     server.\r\n * @param {Array<Wire.QueuedMap>=} opt_undeliveredMaps\r\n *     The array of undelivered maps, which have definitely not been delivered\r\n *     to the server.\r\n */\r\nWebChannelBase.Handler.prototype.channelClosed = function(\r\n    channel, opt_pendingMaps, opt_undeliveredMaps) {};\r\n\r\n\r\n/**\r\n * Gets any parameters that should be added at the time another connection is\r\n * made to the server.\r\n * @param {WebChannelBase} channel The channel.\r\n * @return {!Object} Extra parameter keys and values to add to the requests.\r\n */\r\nWebChannelBase.Handler.prototype.getAdditionalParams = function(channel) {\r\n  return {};\r\n};\r\n\r\n\r\n/**\r\n * Gets the URI of an image that can be used to test network connectivity.\r\n * @param {WebChannelBase} channel The channel.\r\n * @return {goog.Uri?} A custom URI to load for the network test.\r\n */\r\nWebChannelBase.Handler.prototype.getNetworkTestImageUri = function(channel) {\r\n  return null;\r\n};\r\n\r\n\r\n/**\r\n * Gets whether this channel is currently active. This is used to determine the\r\n * length of time to wait before retrying.\r\n * @param {WebChannelBase} channel The channel.\r\n * @return {boolean} Whether the channel is currently active.\r\n */\r\nWebChannelBase.Handler.prototype.isActive = function(channel) {\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * Called by the channel if enumeration of the map throws an exception.\r\n * @param {WebChannelBase} channel The channel.\r\n * @param {Object} map The map that can't be enumerated.\r\n */\r\nWebChannelBase.Handler.prototype.badMapError = function(channel, map) {};\r\n\r\n\r\n/**\r\n * Allows the handler to override a host prefix provided by the server. Will\r\n * be called whenever the channel has received such a prefix and is considering\r\n * its use.\r\n * @param {?string} serverHostPrefix The host prefix provided by the server.\r\n * @return {?string} The host prefix the client should use.\r\n */\r\nWebChannelBase.Handler.prototype.correctHostPrefix = function(\r\n    serverHostPrefix) {\r\n  return serverHostPrefix;\r\n};\r\n});  // goog.scope\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Utilities for string manipulation.\r\n * @author arv@google.com (Erik Arvidsson)\r\n */\r\n\r\n\r\n/**\r\n * Namespace for string utilities\r\n */\r\ngoog.provide('goog.string');\r\ngoog.provide('goog.string.Unicode');\r\n\r\ngoog.require('goog.string.internal');\r\n\r\n\r\n/**\r\n * @define {boolean} Enables HTML escaping of lowercase letter \"e\" which helps\r\n * with detection of double-escaping as this letter is frequently used.\r\n */\r\ngoog.string.DETECT_DOUBLE_ESCAPING =\r\n    goog.define('goog.string.DETECT_DOUBLE_ESCAPING', false);\r\n\r\n\r\n/**\r\n * @define {boolean} Whether to force non-dom html unescaping.\r\n */\r\ngoog.string.FORCE_NON_DOM_HTML_UNESCAPING =\r\n    goog.define('goog.string.FORCE_NON_DOM_HTML_UNESCAPING', false);\r\n\r\n\r\n/**\r\n * Common Unicode string characters.\r\n * @enum {string}\r\n */\r\ngoog.string.Unicode = {\r\n  NBSP: '\\xa0'\r\n};\r\n\r\n\r\n/**\r\n * Fast prefix-checker.\r\n * @param {string} str The string to check.\r\n * @param {string} prefix A string to look for at the start of `str`.\r\n * @return {boolean} True if `str` begins with `prefix`.\r\n */\r\ngoog.string.startsWith = goog.string.internal.startsWith;\r\n\r\n\r\n/**\r\n * Fast suffix-checker.\r\n * @param {string} str The string to check.\r\n * @param {string} suffix A string to look for at the end of `str`.\r\n * @return {boolean} True if `str` ends with `suffix`.\r\n */\r\ngoog.string.endsWith = goog.string.internal.endsWith;\r\n\r\n\r\n/**\r\n * Case-insensitive prefix-checker.\r\n * @param {string} str The string to check.\r\n * @param {string} prefix  A string to look for at the end of `str`.\r\n * @return {boolean} True if `str` begins with `prefix` (ignoring\r\n *     case).\r\n */\r\ngoog.string.caseInsensitiveStartsWith =\r\n    goog.string.internal.caseInsensitiveStartsWith;\r\n\r\n\r\n/**\r\n * Case-insensitive suffix-checker.\r\n * @param {string} str The string to check.\r\n * @param {string} suffix A string to look for at the end of `str`.\r\n * @return {boolean} True if `str` ends with `suffix` (ignoring\r\n *     case).\r\n */\r\ngoog.string.caseInsensitiveEndsWith =\r\n    goog.string.internal.caseInsensitiveEndsWith;\r\n\r\n\r\n/**\r\n * Case-insensitive equality checker.\r\n * @param {string} str1 First string to check.\r\n * @param {string} str2 Second string to check.\r\n * @return {boolean} True if `str1` and `str2` are the same string,\r\n *     ignoring case.\r\n */\r\ngoog.string.caseInsensitiveEquals = goog.string.internal.caseInsensitiveEquals;\r\n\r\n\r\n/**\r\n * Does simple python-style string substitution.\r\n * subs(\"foo%s hot%s\", \"bar\", \"dog\") becomes \"foobar hotdog\".\r\n * @param {string} str The string containing the pattern.\r\n * @param {...*} var_args The items to substitute into the pattern.\r\n * @return {string} A copy of `str` in which each occurrence of\r\n *     {@code %s} has been replaced an argument from `var_args`.\r\n */\r\ngoog.string.subs = function(str, var_args) {\r\n  var splitParts = str.split('%s');\r\n  var returnString = '';\r\n\r\n  var subsArguments = Array.prototype.slice.call(arguments, 1);\r\n  while (subsArguments.length &&\r\n         // Replace up to the last split part. We are inserting in the\r\n         // positions between split parts.\r\n         splitParts.length > 1) {\r\n    returnString += splitParts.shift() + subsArguments.shift();\r\n  }\r\n\r\n  return returnString + splitParts.join('%s');  // Join unused '%s'\r\n};\r\n\r\n\r\n/**\r\n * Converts multiple whitespace chars (spaces, non-breaking-spaces, new lines\r\n * and tabs) to a single space, and strips leading and trailing whitespace.\r\n * @param {string} str Input string.\r\n * @return {string} A copy of `str` with collapsed whitespace.\r\n */\r\ngoog.string.collapseWhitespace = function(str) {\r\n  // Since IE doesn't include non-breaking-space (0xa0) in their \\s character\r\n  // class (as required by section 7.2 of the ECMAScript spec), we explicitly\r\n  // include it in the regexp to enforce consistent cross-browser behavior.\r\n  return str.replace(/[\\s\\xa0]+/g, ' ').replace(/^\\s+|\\s+$/g, '');\r\n};\r\n\r\n\r\n/**\r\n * Checks if a string is empty or contains only whitespaces.\r\n * @param {string} str The string to check.\r\n * @return {boolean} Whether `str` is empty or whitespace only.\r\n */\r\ngoog.string.isEmptyOrWhitespace = goog.string.internal.isEmptyOrWhitespace;\r\n\r\n\r\n/**\r\n * Checks if a string is empty.\r\n * @param {string} str The string to check.\r\n * @return {boolean} Whether `str` is empty.\r\n */\r\ngoog.string.isEmptyString = function(str) {\r\n  return str.length == 0;\r\n};\r\n\r\n\r\n/**\r\n * Checks if a string is empty or contains only whitespaces.\r\n *\r\n * @param {string} str The string to check.\r\n * @return {boolean} Whether `str` is empty or whitespace only.\r\n * @deprecated Use goog.string.isEmptyOrWhitespace instead.\r\n */\r\ngoog.string.isEmpty = goog.string.isEmptyOrWhitespace;\r\n\r\n\r\n/**\r\n * Checks if a string is null, undefined, empty or contains only whitespaces.\r\n * @param {*} str The string to check.\r\n * @return {boolean} Whether `str` is null, undefined, empty, or\r\n *     whitespace only.\r\n * @deprecated Use goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str))\r\n *     instead.\r\n */\r\ngoog.string.isEmptyOrWhitespaceSafe = function(str) {\r\n  return goog.string.isEmptyOrWhitespace(goog.string.makeSafe(str));\r\n};\r\n\r\n\r\n/**\r\n * Checks if a string is null, undefined, empty or contains only whitespaces.\r\n *\r\n * @param {*} str The string to check.\r\n * @return {boolean} Whether `str` is null, undefined, empty, or\r\n *     whitespace only.\r\n * @deprecated Use goog.string.isEmptyOrWhitespace instead.\r\n */\r\ngoog.string.isEmptySafe = goog.string.isEmptyOrWhitespaceSafe;\r\n\r\n\r\n/**\r\n * Checks if a string is all breaking whitespace.\r\n * @param {string} str The string to check.\r\n * @return {boolean} Whether the string is all breaking whitespace.\r\n */\r\ngoog.string.isBreakingWhitespace = function(str) {\r\n  return !/[^\\t\\n\\r ]/.test(str);\r\n};\r\n\r\n\r\n/**\r\n * Checks if a string contains all letters.\r\n * @param {string} str string to check.\r\n * @return {boolean} True if `str` consists entirely of letters.\r\n */\r\ngoog.string.isAlpha = function(str) {\r\n  return !/[^a-zA-Z]/.test(str);\r\n};\r\n\r\n\r\n/**\r\n * Checks if a string contains only numbers.\r\n * @param {*} str string to check. If not a string, it will be\r\n *     casted to one.\r\n * @return {boolean} True if `str` is numeric.\r\n */\r\ngoog.string.isNumeric = function(str) {\r\n  return !/[^0-9]/.test(str);\r\n};\r\n\r\n\r\n/**\r\n * Checks if a string contains only numbers or letters.\r\n * @param {string} str string to check.\r\n * @return {boolean} True if `str` is alphanumeric.\r\n */\r\ngoog.string.isAlphaNumeric = function(str) {\r\n  return !/[^a-zA-Z0-9]/.test(str);\r\n};\r\n\r\n\r\n/**\r\n * Checks if a character is a space character.\r\n * @param {string} ch Character to check.\r\n * @return {boolean} True if `ch` is a space.\r\n */\r\ngoog.string.isSpace = function(ch) {\r\n  return ch == ' ';\r\n};\r\n\r\n\r\n/**\r\n * Checks if a character is a valid unicode character.\r\n * @param {string} ch Character to check.\r\n * @return {boolean} True if `ch` is a valid unicode character.\r\n */\r\ngoog.string.isUnicodeChar = function(ch) {\r\n  return ch.length == 1 && ch >= ' ' && ch <= '~' ||\r\n      ch >= '\\u0080' && ch <= '\\uFFFD';\r\n};\r\n\r\n\r\n/**\r\n * Takes a string and replaces newlines with a space. Multiple lines are\r\n * replaced with a single space.\r\n * @param {string} str The string from which to strip newlines.\r\n * @return {string} A copy of `str` stripped of newlines.\r\n */\r\ngoog.string.stripNewlines = function(str) {\r\n  return str.replace(/(\\r\\n|\\r|\\n)+/g, ' ');\r\n};\r\n\r\n\r\n/**\r\n * Replaces Windows and Mac new lines with unix style: \\r or \\r\\n with \\n.\r\n * @param {string} str The string to in which to canonicalize newlines.\r\n * @return {string} `str` A copy of {@code} with canonicalized newlines.\r\n */\r\ngoog.string.canonicalizeNewlines = function(str) {\r\n  return str.replace(/(\\r\\n|\\r|\\n)/g, '\\n');\r\n};\r\n\r\n\r\n/**\r\n * Normalizes whitespace in a string, replacing all whitespace chars with\r\n * a space.\r\n * @param {string} str The string in which to normalize whitespace.\r\n * @return {string} A copy of `str` with all whitespace normalized.\r\n */\r\ngoog.string.normalizeWhitespace = function(str) {\r\n  return str.replace(/\\xa0|\\s/g, ' ');\r\n};\r\n\r\n\r\n/**\r\n * Normalizes spaces in a string, replacing all consecutive spaces and tabs\r\n * with a single space. Replaces non-breaking space with a space.\r\n * @param {string} str The string in which to normalize spaces.\r\n * @return {string} A copy of `str` with all consecutive spaces and tabs\r\n *    replaced with a single space.\r\n */\r\ngoog.string.normalizeSpaces = function(str) {\r\n  return str.replace(/\\xa0|[ \\t]+/g, ' ');\r\n};\r\n\r\n\r\n/**\r\n * Removes the breaking spaces from the left and right of the string and\r\n * collapses the sequences of breaking spaces in the middle into single spaces.\r\n * The original and the result strings render the same way in HTML.\r\n * @param {string} str A string in which to collapse spaces.\r\n * @return {string} Copy of the string with normalized breaking spaces.\r\n */\r\ngoog.string.collapseBreakingSpaces = function(str) {\r\n  return str.replace(/[\\t\\r\\n ]+/g, ' ')\r\n      .replace(/^[\\t\\r\\n ]+|[\\t\\r\\n ]+$/g, '');\r\n};\r\n\r\n\r\n/**\r\n * Trims white spaces to the left and right of a string.\r\n * @param {string} str The string to trim.\r\n * @return {string} A trimmed copy of `str`.\r\n */\r\ngoog.string.trim = goog.string.internal.trim;\r\n\r\n\r\n/**\r\n * Trims whitespaces at the left end of a string.\r\n * @param {string} str The string to left trim.\r\n * @return {string} A trimmed copy of `str`.\r\n */\r\ngoog.string.trimLeft = function(str) {\r\n  // Since IE doesn't include non-breaking-space (0xa0) in their \\s character\r\n  // class (as required by section 7.2 of the ECMAScript spec), we explicitly\r\n  // include it in the regexp to enforce consistent cross-browser behavior.\r\n  return str.replace(/^[\\s\\xa0]+/, '');\r\n};\r\n\r\n\r\n/**\r\n * Trims whitespaces at the right end of a string.\r\n * @param {string} str The string to right trim.\r\n * @return {string} A trimmed copy of `str`.\r\n */\r\ngoog.string.trimRight = function(str) {\r\n  // Since IE doesn't include non-breaking-space (0xa0) in their \\s character\r\n  // class (as required by section 7.2 of the ECMAScript spec), we explicitly\r\n  // include it in the regexp to enforce consistent cross-browser behavior.\r\n  return str.replace(/[\\s\\xa0]+$/, '');\r\n};\r\n\r\n\r\n/**\r\n * A string comparator that ignores case.\r\n * -1 = str1 less than str2\r\n *  0 = str1 equals str2\r\n *  1 = str1 greater than str2\r\n *\r\n * @param {string} str1 The string to compare.\r\n * @param {string} str2 The string to compare `str1` to.\r\n * @return {number} The comparator result, as described above.\r\n */\r\ngoog.string.caseInsensitiveCompare =\r\n    goog.string.internal.caseInsensitiveCompare;\r\n\r\n\r\n/**\r\n * Compares two strings interpreting their numeric substrings as numbers.\r\n *\r\n * @param {string} str1 First string.\r\n * @param {string} str2 Second string.\r\n * @param {!RegExp} tokenizerRegExp Splits a string into substrings of\r\n *     non-negative integers, non-numeric characters and optionally fractional\r\n *     numbers starting with a decimal point.\r\n * @return {number} Negative if str1 < str2, 0 is str1 == str2, positive if\r\n *     str1 > str2.\r\n * @private\r\n */\r\ngoog.string.numberAwareCompare_ = function(str1, str2, tokenizerRegExp) {\r\n  if (str1 == str2) {\r\n    return 0;\r\n  }\r\n  if (!str1) {\r\n    return -1;\r\n  }\r\n  if (!str2) {\r\n    return 1;\r\n  }\r\n\r\n  // Using match to split the entire string ahead of time turns out to be faster\r\n  // for most inputs than using RegExp.exec or iterating over each character.\r\n  var tokens1 = str1.toLowerCase().match(tokenizerRegExp);\r\n  var tokens2 = str2.toLowerCase().match(tokenizerRegExp);\r\n\r\n  var count = Math.min(tokens1.length, tokens2.length);\r\n\r\n  for (var i = 0; i < count; i++) {\r\n    var a = tokens1[i];\r\n    var b = tokens2[i];\r\n\r\n    // Compare pairs of tokens, returning if one token sorts before the other.\r\n    if (a != b) {\r\n      // Only if both tokens are integers is a special comparison required.\r\n      // Decimal numbers are sorted as strings (e.g., '.09' < '.1').\r\n      var num1 = parseInt(a, 10);\r\n      if (!isNaN(num1)) {\r\n        var num2 = parseInt(b, 10);\r\n        if (!isNaN(num2) && num1 - num2) {\r\n          return num1 - num2;\r\n        }\r\n      }\r\n      return a < b ? -1 : 1;\r\n    }\r\n  }\r\n\r\n  // If one string is a substring of the other, the shorter string sorts first.\r\n  if (tokens1.length != tokens2.length) {\r\n    return tokens1.length - tokens2.length;\r\n  }\r\n\r\n  // The two strings must be equivalent except for case (perfect equality is\r\n  // tested at the head of the function.) Revert to default ASCII string\r\n  // comparison to stabilize the sort.\r\n  return str1 < str2 ? -1 : 1;\r\n};\r\n\r\n\r\n/**\r\n * String comparison function that handles non-negative integer numbers in a\r\n * way humans might expect. Using this function, the string 'File 2.jpg' sorts\r\n * before 'File 10.jpg', and 'Version 1.9' before 'Version 1.10'. The comparison\r\n * is mostly case-insensitive, though strings that are identical except for case\r\n * are sorted with the upper-case strings before lower-case.\r\n *\r\n * This comparison function is up to 50x slower than either the default or the\r\n * case-insensitive compare. It should not be used in time-critical code, but\r\n * should be fast enough to sort several hundred short strings (like filenames)\r\n * with a reasonable delay.\r\n *\r\n * @param {string} str1 The string to compare in a numerically sensitive way.\r\n * @param {string} str2 The string to compare `str1` to.\r\n * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than\r\n *     0 if str1 > str2.\r\n */\r\ngoog.string.intAwareCompare = function(str1, str2) {\r\n  return goog.string.numberAwareCompare_(str1, str2, /\\d+|\\D+/g);\r\n};\r\n\r\n\r\n/**\r\n * String comparison function that handles non-negative integer and fractional\r\n * numbers in a way humans might expect. Using this function, the string\r\n * 'File 2.jpg' sorts before 'File 10.jpg', and '3.14' before '3.2'. Equivalent\r\n * to {@link goog.string.intAwareCompare} apart from the way how it interprets\r\n * dots.\r\n *\r\n * @param {string} str1 The string to compare in a numerically sensitive way.\r\n * @param {string} str2 The string to compare `str1` to.\r\n * @return {number} less than 0 if str1 < str2, 0 if str1 == str2, greater than\r\n *     0 if str1 > str2.\r\n */\r\ngoog.string.floatAwareCompare = function(str1, str2) {\r\n  return goog.string.numberAwareCompare_(str1, str2, /\\d+|\\.\\d+|\\D+/g);\r\n};\r\n\r\n\r\n/**\r\n * Alias for {@link goog.string.floatAwareCompare}.\r\n *\r\n * @param {string} str1\r\n * @param {string} str2\r\n * @return {number}\r\n */\r\ngoog.string.numerateCompare = goog.string.floatAwareCompare;\r\n\r\n\r\n/**\r\n * URL-encodes a string\r\n * @param {*} str The string to url-encode.\r\n * @return {string} An encoded copy of `str` that is safe for urls.\r\n *     Note that '#', ':', and other characters used to delimit portions\r\n *     of URLs *will* be encoded.\r\n */\r\ngoog.string.urlEncode = function(str) {\r\n  return encodeURIComponent(String(str));\r\n};\r\n\r\n\r\n/**\r\n * URL-decodes the string. We need to specially handle '+'s because\r\n * the javascript library doesn't convert them to spaces.\r\n * @param {string} str The string to url decode.\r\n * @return {string} The decoded `str`.\r\n */\r\ngoog.string.urlDecode = function(str) {\r\n  return decodeURIComponent(str.replace(/\\+/g, ' '));\r\n};\r\n\r\n\r\n/**\r\n * Converts \\n to <br>s or <br />s.\r\n * @param {string} str The string in which to convert newlines.\r\n * @param {boolean=} opt_xml Whether to use XML compatible tags.\r\n * @return {string} A copy of `str` with converted newlines.\r\n */\r\ngoog.string.newLineToBr = goog.string.internal.newLineToBr;\r\n\r\n\r\n/**\r\n * Escapes double quote '\"' and single quote '\\'' characters in addition to\r\n * '&', '<', and '>' so that a string can be included in an HTML tag attribute\r\n * value within double or single quotes.\r\n *\r\n * It should be noted that > doesn't need to be escaped for the HTML or XML to\r\n * be valid, but it has been decided to escape it for consistency with other\r\n * implementations.\r\n *\r\n * With goog.string.DETECT_DOUBLE_ESCAPING, this function escapes also the\r\n * lowercase letter \"e\".\r\n *\r\n * NOTE(user):\r\n * HtmlEscape is often called during the generation of large blocks of HTML.\r\n * Using statics for the regular expressions and strings is an optimization\r\n * that can more than half the amount of time IE spends in this function for\r\n * large apps, since strings and regexes both contribute to GC allocations.\r\n *\r\n * Testing for the presence of a character before escaping increases the number\r\n * of function calls, but actually provides a speed increase for the average\r\n * case -- since the average case often doesn't require the escaping of all 4\r\n * characters and indexOf() is much cheaper than replace().\r\n * The worst case does suffer slightly from the additional calls, therefore the\r\n * opt_isLikelyToContainHtmlChars option has been included for situations\r\n * where all 4 HTML entities are very likely to be present and need escaping.\r\n *\r\n * Some benchmarks (times tended to fluctuate +-0.05ms):\r\n *                                     FireFox                     IE6\r\n * (no chars / average (mix of cases) / all 4 chars)\r\n * no checks                     0.13 / 0.22 / 0.22         0.23 / 0.53 / 0.80\r\n * indexOf                       0.08 / 0.17 / 0.26         0.22 / 0.54 / 0.84\r\n * indexOf + re test             0.07 / 0.17 / 0.28         0.19 / 0.50 / 0.85\r\n *\r\n * An additional advantage of checking if replace actually needs to be called\r\n * is a reduction in the number of object allocations, so as the size of the\r\n * application grows the difference between the various methods would increase.\r\n *\r\n * @param {string} str string to be escaped.\r\n * @param {boolean=} opt_isLikelyToContainHtmlChars Don't perform a check to see\r\n *     if the character needs replacing - use this option if you expect each of\r\n *     the characters to appear often. Leave false if you expect few html\r\n *     characters to occur in your strings, such as if you are escaping HTML.\r\n * @return {string} An escaped copy of `str`.\r\n */\r\ngoog.string.htmlEscape = function(str, opt_isLikelyToContainHtmlChars) {\r\n  str = goog.string.internal.htmlEscape(str, opt_isLikelyToContainHtmlChars);\r\n  if (goog.string.DETECT_DOUBLE_ESCAPING) {\r\n    str = str.replace(goog.string.E_RE_, '&#101;');\r\n  }\r\n  return str;\r\n};\r\n\r\n\r\n/**\r\n * Regular expression that matches a lowercase letter \"e\", for use in escaping.\r\n * @const {!RegExp}\r\n * @private\r\n */\r\ngoog.string.E_RE_ = /e/g;\r\n\r\n\r\n/**\r\n * Unescapes an HTML string.\r\n *\r\n * @param {string} str The string to unescape.\r\n * @return {string} An unescaped copy of `str`.\r\n */\r\ngoog.string.unescapeEntities = function(str) {\r\n  if (goog.string.contains(str, '&')) {\r\n    // We are careful not to use a DOM if we do not have one or we explicitly\r\n    // requested non-DOM html unescaping.\r\n    if (!goog.string.FORCE_NON_DOM_HTML_UNESCAPING &&\r\n        'document' in goog.global) {\r\n      return goog.string.unescapeEntitiesUsingDom_(str);\r\n    } else {\r\n      // Fall back on pure XML entities\r\n      return goog.string.unescapePureXmlEntities_(str);\r\n    }\r\n  }\r\n  return str;\r\n};\r\n\r\n\r\n/**\r\n * Unescapes a HTML string using the provided document.\r\n *\r\n * @param {string} str The string to unescape.\r\n * @param {!Document} document A document to use in escaping the string.\r\n * @return {string} An unescaped copy of `str`.\r\n */\r\ngoog.string.unescapeEntitiesWithDocument = function(str, document) {\r\n  if (goog.string.contains(str, '&')) {\r\n    return goog.string.unescapeEntitiesUsingDom_(str, document);\r\n  }\r\n  return str;\r\n};\r\n\r\n\r\n/**\r\n * Unescapes an HTML string using a DOM to resolve non-XML, non-numeric\r\n * entities. This function is XSS-safe and whitespace-preserving.\r\n * @private\r\n * @param {string} str The string to unescape.\r\n * @param {Document=} opt_document An optional document to use for creating\r\n *     elements. If this is not specified then the default window.document\r\n *     will be used.\r\n * @return {string} The unescaped `str` string.\r\n */\r\ngoog.string.unescapeEntitiesUsingDom_ = function(str, opt_document) {\r\n  /** @type {!Object<string, string>} */\r\n  var seen = {'&amp;': '&', '&lt;': '<', '&gt;': '>', '&quot;': '\"'};\r\n  /** @type {!Element} */\r\n  var div;\r\n  if (opt_document) {\r\n    div = opt_document.createElement('div');\r\n  } else {\r\n    div = goog.global.document.createElement('div');\r\n  }\r\n  // Match as many valid entity characters as possible. If the actual entity\r\n  // happens to be shorter, it will still work as innerHTML will return the\r\n  // trailing characters unchanged. Since the entity characters do not include\r\n  // open angle bracket, there is no chance of XSS from the innerHTML use.\r\n  // Since no whitespace is passed to innerHTML, whitespace is preserved.\r\n  return str.replace(goog.string.HTML_ENTITY_PATTERN_, function(s, entity) {\r\n    // Check for cached entity.\r\n    var value = seen[s];\r\n    if (value) {\r\n      return value;\r\n    }\r\n    // Check for numeric entity.\r\n    if (entity.charAt(0) == '#') {\r\n      // Prefix with 0 so that hex entities (e.g. &#x10) parse as hex numbers.\r\n      var n = Number('0' + entity.substr(1));\r\n      if (!isNaN(n)) {\r\n        value = String.fromCharCode(n);\r\n      }\r\n    }\r\n    // Fall back to innerHTML otherwise.\r\n    if (!value) {\r\n      // Append a non-entity character to avoid a bug in Webkit that parses\r\n      // an invalid entity at the end of innerHTML text as the empty string.\r\n      div.innerHTML = s + ' ';\r\n      // Then remove the trailing character from the result.\r\n      value = div.firstChild.nodeValue.slice(0, -1);\r\n    }\r\n    // Cache and return.\r\n    return seen[s] = value;\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Unescapes XML entities.\r\n * @private\r\n * @param {string} str The string to unescape.\r\n * @return {string} An unescaped copy of `str`.\r\n */\r\ngoog.string.unescapePureXmlEntities_ = function(str) {\r\n  return str.replace(/&([^;]+);/g, function(s, entity) {\r\n    switch (entity) {\r\n      case 'amp':\r\n        return '&';\r\n      case 'lt':\r\n        return '<';\r\n      case 'gt':\r\n        return '>';\r\n      case 'quot':\r\n        return '\"';\r\n      default:\r\n        if (entity.charAt(0) == '#') {\r\n          // Prefix with 0 so that hex entities (e.g. &#x10) parse as hex.\r\n          var n = Number('0' + entity.substr(1));\r\n          if (!isNaN(n)) {\r\n            return String.fromCharCode(n);\r\n          }\r\n        }\r\n        // For invalid entities we just return the entity\r\n        return s;\r\n    }\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Regular expression that matches an HTML entity.\r\n * See also HTML5: Tokenization / Tokenizing character references.\r\n * @private\r\n * @type {!RegExp}\r\n */\r\ngoog.string.HTML_ENTITY_PATTERN_ = /&([^;\\s<&]+);?/g;\r\n\r\n\r\n/**\r\n * Do escaping of whitespace to preserve spatial formatting. We use character\r\n * entity #160 to make it safer for xml.\r\n * @param {string} str The string in which to escape whitespace.\r\n * @param {boolean=} opt_xml Whether to use XML compatible tags.\r\n * @return {string} An escaped copy of `str`.\r\n */\r\ngoog.string.whitespaceEscape = function(str, opt_xml) {\r\n  // This doesn't use goog.string.preserveSpaces for backwards compatibility.\r\n  return goog.string.newLineToBr(str.replace(/  /g, ' &#160;'), opt_xml);\r\n};\r\n\r\n\r\n/**\r\n * Preserve spaces that would be otherwise collapsed in HTML by replacing them\r\n * with non-breaking space Unicode characters.\r\n * @param {string} str The string in which to preserve whitespace.\r\n * @return {string} A copy of `str` with preserved whitespace.\r\n */\r\ngoog.string.preserveSpaces = function(str) {\r\n  return str.replace(/(^|[\\n ]) /g, '$1' + goog.string.Unicode.NBSP);\r\n};\r\n\r\n\r\n/**\r\n * Strip quote characters around a string.  The second argument is a string of\r\n * characters to treat as quotes.  This can be a single character or a string of\r\n * multiple character and in that case each of those are treated as possible\r\n * quote characters. For example:\r\n *\r\n * <pre>\r\n * goog.string.stripQuotes('\"abc\"', '\"`') --> 'abc'\r\n * goog.string.stripQuotes('`abc`', '\"`') --> 'abc'\r\n * </pre>\r\n *\r\n * @param {string} str The string to strip.\r\n * @param {string} quoteChars The quote characters to strip.\r\n * @return {string} A copy of `str` without the quotes.\r\n */\r\ngoog.string.stripQuotes = function(str, quoteChars) {\r\n  var length = quoteChars.length;\r\n  for (var i = 0; i < length; i++) {\r\n    var quoteChar = length == 1 ? quoteChars : quoteChars.charAt(i);\r\n    if (str.charAt(0) == quoteChar && str.charAt(str.length - 1) == quoteChar) {\r\n      return str.substring(1, str.length - 1);\r\n    }\r\n  }\r\n  return str;\r\n};\r\n\r\n\r\n/**\r\n * Truncates a string to a certain length and adds '...' if necessary.  The\r\n * length also accounts for the ellipsis, so a maximum length of 10 and a string\r\n * 'Hello World!' produces 'Hello W...'.\r\n * @param {string} str The string to truncate.\r\n * @param {number} chars Max number of characters.\r\n * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped\r\n *     characters from being cut off in the middle.\r\n * @return {string} The truncated `str` string.\r\n */\r\ngoog.string.truncate = function(str, chars, opt_protectEscapedCharacters) {\r\n  if (opt_protectEscapedCharacters) {\r\n    str = goog.string.unescapeEntities(str);\r\n  }\r\n\r\n  if (str.length > chars) {\r\n    str = str.substring(0, chars - 3) + '...';\r\n  }\r\n\r\n  if (opt_protectEscapedCharacters) {\r\n    str = goog.string.htmlEscape(str);\r\n  }\r\n\r\n  return str;\r\n};\r\n\r\n\r\n/**\r\n * Truncate a string in the middle, adding \"...\" if necessary,\r\n * and favoring the beginning of the string.\r\n * @param {string} str The string to truncate the middle of.\r\n * @param {number} chars Max number of characters.\r\n * @param {boolean=} opt_protectEscapedCharacters Whether to protect escaped\r\n *     characters from being cutoff in the middle.\r\n * @param {number=} opt_trailingChars Optional number of trailing characters to\r\n *     leave at the end of the string, instead of truncating as close to the\r\n *     middle as possible.\r\n * @return {string} A truncated copy of `str`.\r\n */\r\ngoog.string.truncateMiddle = function(\r\n    str, chars, opt_protectEscapedCharacters, opt_trailingChars) {\r\n  if (opt_protectEscapedCharacters) {\r\n    str = goog.string.unescapeEntities(str);\r\n  }\r\n\r\n  if (opt_trailingChars && str.length > chars) {\r\n    if (opt_trailingChars > chars) {\r\n      opt_trailingChars = chars;\r\n    }\r\n    var endPoint = str.length - opt_trailingChars;\r\n    var startPoint = chars - opt_trailingChars;\r\n    str = str.substring(0, startPoint) + '...' + str.substring(endPoint);\r\n  } else if (str.length > chars) {\r\n    // Favor the beginning of the string:\r\n    var half = Math.floor(chars / 2);\r\n    var endPos = str.length - half;\r\n    half += chars % 2;\r\n    str = str.substring(0, half) + '...' + str.substring(endPos);\r\n  }\r\n\r\n  if (opt_protectEscapedCharacters) {\r\n    str = goog.string.htmlEscape(str);\r\n  }\r\n\r\n  return str;\r\n};\r\n\r\n\r\n/**\r\n * Special chars that need to be escaped for goog.string.quote.\r\n * @private {!Object<string, string>}\r\n */\r\ngoog.string.specialEscapeChars_ = {\r\n  '\\0': '\\\\0',\r\n  '\\b': '\\\\b',\r\n  '\\f': '\\\\f',\r\n  '\\n': '\\\\n',\r\n  '\\r': '\\\\r',\r\n  '\\t': '\\\\t',\r\n  '\\x0B': '\\\\x0B',  // '\\v' is not supported in JScript\r\n  '\"': '\\\\\"',\r\n  '\\\\': '\\\\\\\\',\r\n  // To support the use case of embedding quoted strings inside of script\r\n  // tags, we have to make sure HTML comments and opening/closing script tags do\r\n  // not appear in the resulting string. The specific strings that must be\r\n  // escaped are documented at:\r\n  // http://www.w3.org/TR/html51/semantics.html#restrictions-for-contents-of-script-elements\r\n  '<': '\\x3c'\r\n};\r\n\r\n\r\n/**\r\n * Character mappings used internally for goog.string.escapeChar.\r\n * @private {!Object<string, string>}\r\n */\r\ngoog.string.jsEscapeCache_ = {\r\n  '\\'': '\\\\\\''\r\n};\r\n\r\n\r\n/**\r\n * Encloses a string in double quotes and escapes characters so that the\r\n * string is a valid JS string. The resulting string is safe to embed in\r\n * `<script>` tags as \"<\" is escaped.\r\n * @param {string} s The string to quote.\r\n * @return {string} A copy of `s` surrounded by double quotes.\r\n */\r\ngoog.string.quote = function(s) {\r\n  s = String(s);\r\n  var sb = ['\"'];\r\n  for (var i = 0; i < s.length; i++) {\r\n    var ch = s.charAt(i);\r\n    var cc = ch.charCodeAt(0);\r\n    sb[i + 1] = goog.string.specialEscapeChars_[ch] ||\r\n        ((cc > 31 && cc < 127) ? ch : goog.string.escapeChar(ch));\r\n  }\r\n  sb.push('\"');\r\n  return sb.join('');\r\n};\r\n\r\n\r\n/**\r\n * Takes a string and returns the escaped string for that input string.\r\n * @param {string} str The string to escape.\r\n * @return {string} An escaped string representing `str`.\r\n */\r\ngoog.string.escapeString = function(str) {\r\n  var sb = [];\r\n  for (var i = 0; i < str.length; i++) {\r\n    sb[i] = goog.string.escapeChar(str.charAt(i));\r\n  }\r\n  return sb.join('');\r\n};\r\n\r\n\r\n/**\r\n * Takes a character and returns the escaped string for that character. For\r\n * example escapeChar(String.fromCharCode(15)) -> \"\\\\x0E\".\r\n * @param {string} c The character to escape.\r\n * @return {string} An escaped string representing `c`.\r\n */\r\ngoog.string.escapeChar = function(c) {\r\n  if (c in goog.string.jsEscapeCache_) {\r\n    return goog.string.jsEscapeCache_[c];\r\n  }\r\n\r\n  if (c in goog.string.specialEscapeChars_) {\r\n    return goog.string.jsEscapeCache_[c] = goog.string.specialEscapeChars_[c];\r\n  }\r\n\r\n  var rv = c;\r\n  var cc = c.charCodeAt(0);\r\n  if (cc > 31 && cc < 127) {\r\n    rv = c;\r\n  } else {\r\n    // tab is 9 but handled above\r\n    if (cc < 256) {\r\n      rv = '\\\\x';\r\n      if (cc < 16 || cc > 256) {\r\n        rv += '0';\r\n      }\r\n    } else {\r\n      rv = '\\\\u';\r\n      if (cc < 4096) {  // \\u1000\r\n        rv += '0';\r\n      }\r\n    }\r\n    rv += cc.toString(16).toUpperCase();\r\n  }\r\n\r\n  return goog.string.jsEscapeCache_[c] = rv;\r\n};\r\n\r\n\r\n/**\r\n * Determines whether a string contains a substring.\r\n * @param {string} str The string to search.\r\n * @param {string} subString The substring to search for.\r\n * @return {boolean} Whether `str` contains `subString`.\r\n */\r\ngoog.string.contains = goog.string.internal.contains;\r\n\r\n\r\n/**\r\n * Determines whether a string contains a substring, ignoring case.\r\n * @param {string} str The string to search.\r\n * @param {string} subString The substring to search for.\r\n * @return {boolean} Whether `str` contains `subString`.\r\n */\r\ngoog.string.caseInsensitiveContains =\r\n    goog.string.internal.caseInsensitiveContains;\r\n\r\n\r\n/**\r\n * Returns the non-overlapping occurrences of ss in s.\r\n * If either s or ss evalutes to false, then returns zero.\r\n * @param {string} s The string to look in.\r\n * @param {string} ss The string to look for.\r\n * @return {number} Number of occurrences of ss in s.\r\n */\r\ngoog.string.countOf = function(s, ss) {\r\n  return s && ss ? s.split(ss).length - 1 : 0;\r\n};\r\n\r\n\r\n/**\r\n * Removes a substring of a specified length at a specific\r\n * index in a string.\r\n * @param {string} s The base string from which to remove.\r\n * @param {number} index The index at which to remove the substring.\r\n * @param {number} stringLength The length of the substring to remove.\r\n * @return {string} A copy of `s` with the substring removed or the full\r\n *     string if nothing is removed or the input is invalid.\r\n */\r\ngoog.string.removeAt = function(s, index, stringLength) {\r\n  var resultStr = s;\r\n  // If the index is greater or equal to 0 then remove substring\r\n  if (index >= 0 && index < s.length && stringLength > 0) {\r\n    resultStr = s.substr(0, index) +\r\n        s.substr(index + stringLength, s.length - index - stringLength);\r\n  }\r\n  return resultStr;\r\n};\r\n\r\n\r\n/**\r\n * Removes the first occurrence of a substring from a string.\r\n * @param {string} str The base string from which to remove.\r\n * @param {string} substr The string to remove.\r\n * @return {string} A copy of `str` with `substr` removed or the\r\n *     full string if nothing is removed.\r\n */\r\ngoog.string.remove = function(str, substr) {\r\n  return str.replace(substr, '');\r\n};\r\n\r\n\r\n/**\r\n *  Removes all occurrences of a substring from a string.\r\n *  @param {string} s The base string from which to remove.\r\n *  @param {string} ss The string to remove.\r\n *  @return {string} A copy of `s` with `ss` removed or the full\r\n *      string if nothing is removed.\r\n */\r\ngoog.string.removeAll = function(s, ss) {\r\n  var re = new RegExp(goog.string.regExpEscape(ss), 'g');\r\n  return s.replace(re, '');\r\n};\r\n\r\n\r\n/**\r\n *  Replaces all occurrences of a substring of a string with a new substring.\r\n *  @param {string} s The base string from which to remove.\r\n *  @param {string} ss The string to replace.\r\n *  @param {string} replacement The replacement string.\r\n *  @return {string} A copy of `s` with `ss` replaced by\r\n *      `replacement` or the original string if nothing is replaced.\r\n */\r\ngoog.string.replaceAll = function(s, ss, replacement) {\r\n  var re = new RegExp(goog.string.regExpEscape(ss), 'g');\r\n  return s.replace(re, replacement.replace(/\\$/g, '$$$$'));\r\n};\r\n\r\n\r\n/**\r\n * Escapes characters in the string that are not safe to use in a RegExp.\r\n * @param {*} s The string to escape. If not a string, it will be casted\r\n *     to one.\r\n * @return {string} A RegExp safe, escaped copy of `s`.\r\n */\r\ngoog.string.regExpEscape = function(s) {\r\n  return String(s)\r\n      .replace(/([-()\\[\\]{}+?*.$\\^|,:#<!\\\\])/g, '\\\\$1')\r\n      .replace(/\\x08/g, '\\\\x08');\r\n};\r\n\r\n\r\n/**\r\n * Repeats a string n times.\r\n * @param {string} string The string to repeat.\r\n * @param {number} length The number of times to repeat.\r\n * @return {string} A string containing `length` repetitions of\r\n *     `string`.\r\n */\r\ngoog.string.repeat = (String.prototype.repeat) ? function(string, length) {\r\n  // The native method is over 100 times faster than the alternative.\r\n  return string.repeat(length);\r\n} : function(string, length) {\r\n  return new Array(length + 1).join(string);\r\n};\r\n\r\n\r\n/**\r\n * Pads number to given length and optionally rounds it to a given precision.\r\n * For example:\r\n * <pre>padNumber(1.25, 2, 3) -> '01.250'\r\n * padNumber(1.25, 2) -> '01.25'\r\n * padNumber(1.25, 2, 1) -> '01.3'\r\n * padNumber(1.25, 0) -> '1.25'</pre>\r\n *\r\n * @param {number} num The number to pad.\r\n * @param {number} length The desired length.\r\n * @param {number=} opt_precision The desired precision.\r\n * @return {string} `num` as a string with the given options.\r\n */\r\ngoog.string.padNumber = function(num, length, opt_precision) {\r\n  var s = goog.isDef(opt_precision) ? num.toFixed(opt_precision) : String(num);\r\n  var index = s.indexOf('.');\r\n  if (index == -1) {\r\n    index = s.length;\r\n  }\r\n  return goog.string.repeat('0', Math.max(0, length - index)) + s;\r\n};\r\n\r\n\r\n/**\r\n * Returns a string representation of the given object, with\r\n * null and undefined being returned as the empty string.\r\n *\r\n * @param {*} obj The object to convert.\r\n * @return {string} A string representation of the `obj`.\r\n */\r\ngoog.string.makeSafe = function(obj) {\r\n  return obj == null ? '' : String(obj);\r\n};\r\n\r\n\r\n/**\r\n * Concatenates string expressions. This is useful\r\n * since some browsers are very inefficient when it comes to using plus to\r\n * concat strings. Be careful when using null and undefined here since\r\n * these will not be included in the result. If you need to represent these\r\n * be sure to cast the argument to a String first.\r\n * For example:\r\n * <pre>buildString('a', 'b', 'c', 'd') -> 'abcd'\r\n * buildString(null, undefined) -> ''\r\n * </pre>\r\n * @param {...*} var_args A list of strings to concatenate. If not a string,\r\n *     it will be casted to one.\r\n * @return {string} The concatenation of `var_args`.\r\n */\r\ngoog.string.buildString = function(var_args) {\r\n  return Array.prototype.join.call(arguments, '');\r\n};\r\n\r\n\r\n/**\r\n * Returns a string with at least 64-bits of randomness.\r\n *\r\n * Doesn't trust JavaScript's random function entirely. Uses a combination of\r\n * random and current timestamp, and then encodes the string in base-36 to\r\n * make it shorter.\r\n *\r\n * @return {string} A random string, e.g. sn1s7vb4gcic.\r\n */\r\ngoog.string.getRandomString = function() {\r\n  var x = 2147483648;\r\n  return Math.floor(Math.random() * x).toString(36) +\r\n      Math.abs(Math.floor(Math.random() * x) ^ goog.now()).toString(36);\r\n};\r\n\r\n\r\n/**\r\n * Compares two version numbers.\r\n *\r\n * @param {string|number} version1 Version of first item.\r\n * @param {string|number} version2 Version of second item.\r\n *\r\n * @return {number}  1 if `version1` is higher.\r\n *                   0 if arguments are equal.\r\n *                  -1 if `version2` is higher.\r\n */\r\ngoog.string.compareVersions = goog.string.internal.compareVersions;\r\n\r\n\r\n/**\r\n * String hash function similar to java.lang.String.hashCode().\r\n * The hash code for a string is computed as\r\n * s[0] * 31 ^ (n - 1) + s[1] * 31 ^ (n - 2) + ... + s[n - 1],\r\n * where s[i] is the ith character of the string and n is the length of\r\n * the string. We mod the result to make it between 0 (inclusive) and 2^32\r\n * (exclusive).\r\n * @param {string} str A string.\r\n * @return {number} Hash value for `str`, between 0 (inclusive) and 2^32\r\n *  (exclusive). The empty string returns 0.\r\n */\r\ngoog.string.hashCode = function(str) {\r\n  var result = 0;\r\n  for (var i = 0; i < str.length; ++i) {\r\n    // Normalize to 4 byte range, 0 ... 2^32.\r\n    result = (31 * result + str.charCodeAt(i)) >>> 0;\r\n  }\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * The most recent unique ID. |0 is equivalent to Math.floor in this case.\r\n * @type {number}\r\n * @private\r\n */\r\ngoog.string.uniqueStringCounter_ = Math.random() * 0x80000000 | 0;\r\n\r\n\r\n/**\r\n * Generates and returns a string which is unique in the current document.\r\n * This is useful, for example, to create unique IDs for DOM elements.\r\n * @return {string} A unique id.\r\n */\r\ngoog.string.createUniqueString = function() {\r\n  return 'goog_' + goog.string.uniqueStringCounter_++;\r\n};\r\n\r\n\r\n/**\r\n * Converts the supplied string to a number, which may be Infinity or NaN.\r\n * This function strips whitespace: (toNumber(' 123') === 123)\r\n * This function accepts scientific notation: (toNumber('1e1') === 10)\r\n *\r\n * This is better than JavaScript's built-in conversions because, sadly:\r\n *     (Number(' ') === 0) and (parseFloat('123a') === 123)\r\n *\r\n * @param {string} str The string to convert.\r\n * @return {number} The number the supplied string represents, or NaN.\r\n */\r\ngoog.string.toNumber = function(str) {\r\n  var num = Number(str);\r\n  if (num == 0 && goog.string.isEmptyOrWhitespace(str)) {\r\n    return NaN;\r\n  }\r\n  return num;\r\n};\r\n\r\n\r\n/**\r\n * Returns whether the given string is lower camel case (e.g. \"isFooBar\").\r\n *\r\n * Note that this assumes the string is entirely letters.\r\n * @see http://en.wikipedia.org/wiki/CamelCase#Variations_and_synonyms\r\n *\r\n * @param {string} str String to test.\r\n * @return {boolean} Whether the string is lower camel case.\r\n */\r\ngoog.string.isLowerCamelCase = function(str) {\r\n  return /^[a-z]+([A-Z][a-z]*)*$/.test(str);\r\n};\r\n\r\n\r\n/**\r\n * Returns whether the given string is upper camel case (e.g. \"FooBarBaz\").\r\n *\r\n * Note that this assumes the string is entirely letters.\r\n * @see http://en.wikipedia.org/wiki/CamelCase#Variations_and_synonyms\r\n *\r\n * @param {string} str String to test.\r\n * @return {boolean} Whether the string is upper camel case.\r\n */\r\ngoog.string.isUpperCamelCase = function(str) {\r\n  return /^([A-Z][a-z]*)+$/.test(str);\r\n};\r\n\r\n\r\n/**\r\n * Converts a string from selector-case to camelCase (e.g. from\r\n * \"multi-part-string\" to \"multiPartString\"), useful for converting\r\n * CSS selectors and HTML dataset keys to their equivalent JS properties.\r\n * @param {string} str The string in selector-case form.\r\n * @return {string} The string in camelCase form.\r\n */\r\ngoog.string.toCamelCase = function(str) {\r\n  return String(str).replace(/\\-([a-z])/g, function(all, match) {\r\n    return match.toUpperCase();\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Converts a string from camelCase to selector-case (e.g. from\r\n * \"multiPartString\" to \"multi-part-string\"), useful for converting JS\r\n * style and dataset properties to equivalent CSS selectors and HTML keys.\r\n * @param {string} str The string in camelCase form.\r\n * @return {string} The string in selector-case form.\r\n */\r\ngoog.string.toSelectorCase = function(str) {\r\n  return String(str).replace(/([A-Z])/g, '-$1').toLowerCase();\r\n};\r\n\r\n\r\n/**\r\n * Converts a string into TitleCase. First character of the string is always\r\n * capitalized in addition to the first letter of every subsequent word.\r\n * Words are delimited by one or more whitespaces by default. Custom delimiters\r\n * can optionally be specified to replace the default, which doesn't preserve\r\n * whitespace delimiters and instead must be explicitly included if needed.\r\n *\r\n * Default delimiter => \" \":\r\n *    goog.string.toTitleCase('oneTwoThree')    => 'OneTwoThree'\r\n *    goog.string.toTitleCase('one two three')  => 'One Two Three'\r\n *    goog.string.toTitleCase('  one   two   ') => '  One   Two   '\r\n *    goog.string.toTitleCase('one_two_three')  => 'One_two_three'\r\n *    goog.string.toTitleCase('one-two-three')  => 'One-two-three'\r\n *\r\n * Custom delimiter => \"_-.\":\r\n *    goog.string.toTitleCase('oneTwoThree', '_-.')       => 'OneTwoThree'\r\n *    goog.string.toTitleCase('one two three', '_-.')     => 'One two three'\r\n *    goog.string.toTitleCase('  one   two   ', '_-.')    => '  one   two   '\r\n *    goog.string.toTitleCase('one_two_three', '_-.')     => 'One_Two_Three'\r\n *    goog.string.toTitleCase('one-two-three', '_-.')     => 'One-Two-Three'\r\n *    goog.string.toTitleCase('one...two...three', '_-.') => 'One...Two...Three'\r\n *    goog.string.toTitleCase('one. two. three', '_-.')   => 'One. two. three'\r\n *    goog.string.toTitleCase('one-two.three', '_-.')     => 'One-Two.Three'\r\n *\r\n * @param {string} str String value in camelCase form.\r\n * @param {string=} opt_delimiters Custom delimiter character set used to\r\n *      distinguish words in the string value. Each character represents a\r\n *      single delimiter. When provided, default whitespace delimiter is\r\n *      overridden and must be explicitly included if needed.\r\n * @return {string} String value in TitleCase form.\r\n */\r\ngoog.string.toTitleCase = function(str, opt_delimiters) {\r\n  var delimiters = goog.isString(opt_delimiters) ?\r\n      goog.string.regExpEscape(opt_delimiters) :\r\n      '\\\\s';\r\n\r\n  // For IE8, we need to prevent using an empty character set. Otherwise,\r\n  // incorrect matching will occur.\r\n  delimiters = delimiters ? '|[' + delimiters + ']+' : '';\r\n\r\n  var regexp = new RegExp('(^' + delimiters + ')([a-z])', 'g');\r\n  return str.replace(regexp, function(all, p1, p2) {\r\n    return p1 + p2.toUpperCase();\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Capitalizes a string, i.e. converts the first letter to uppercase\r\n * and all other letters to lowercase, e.g.:\r\n *\r\n * goog.string.capitalize('one')     => 'One'\r\n * goog.string.capitalize('ONE')     => 'One'\r\n * goog.string.capitalize('one two') => 'One two'\r\n *\r\n * Note that this function does not trim initial whitespace.\r\n *\r\n * @param {string} str String value to capitalize.\r\n * @return {string} String value with first letter in uppercase.\r\n */\r\ngoog.string.capitalize = function(str) {\r\n  return String(str.charAt(0)).toUpperCase() +\r\n      String(str.substr(1)).toLowerCase();\r\n};\r\n\r\n\r\n/**\r\n * Parse a string in decimal or hexidecimal ('0xFFFF') form.\r\n *\r\n * To parse a particular radix, please use parseInt(string, radix) directly. See\r\n * https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/parseInt\r\n *\r\n * This is a wrapper for the built-in parseInt function that will only parse\r\n * numbers as base 10 or base 16.  Some JS implementations assume strings\r\n * starting with \"0\" are intended to be octal. ES3 allowed but discouraged\r\n * this behavior. ES5 forbids it.  This function emulates the ES5 behavior.\r\n *\r\n * For more information, see Mozilla JS Reference: http://goo.gl/8RiFj\r\n *\r\n * @param {string|number|null|undefined} value The value to be parsed.\r\n * @return {number} The number, parsed. If the string failed to parse, this\r\n *     will be NaN.\r\n */\r\ngoog.string.parseInt = function(value) {\r\n  // Force finite numbers to strings.\r\n  if (isFinite(value)) {\r\n    value = String(value);\r\n  }\r\n\r\n  if (goog.isString(value)) {\r\n    // If the string starts with '0x' or '-0x', parse as hex.\r\n    return /^\\s*-?0x/i.test(value) ? parseInt(value, 16) : parseInt(value, 10);\r\n  }\r\n\r\n  return NaN;\r\n};\r\n\r\n\r\n/**\r\n * Splits a string on a separator a limited number of times.\r\n *\r\n * This implementation is more similar to Python or Java, where the limit\r\n * parameter specifies the maximum number of splits rather than truncating\r\n * the number of results.\r\n *\r\n * See http://docs.python.org/2/library/stdtypes.html#str.split\r\n * See JavaDoc: http://goo.gl/F2AsY\r\n * See Mozilla reference: http://goo.gl/dZdZs\r\n *\r\n * @param {string} str String to split.\r\n * @param {string} separator The separator.\r\n * @param {number} limit The limit to the number of splits. The resulting array\r\n *     will have a maximum length of limit+1.  Negative numbers are the same\r\n *     as zero.\r\n * @return {!Array<string>} The string, split.\r\n */\r\ngoog.string.splitLimit = function(str, separator, limit) {\r\n  var parts = str.split(separator);\r\n  var returnVal = [];\r\n\r\n  // Only continue doing this while we haven't hit the limit and we have\r\n  // parts left.\r\n  while (limit > 0 && parts.length) {\r\n    returnVal.push(parts.shift());\r\n    limit--;\r\n  }\r\n\r\n  // If there are remaining parts, append them to the end.\r\n  if (parts.length) {\r\n    returnVal.push(parts.join(separator));\r\n  }\r\n\r\n  return returnVal;\r\n};\r\n\r\n\r\n/**\r\n * Finds the characters to the right of the last instance of any separator\r\n *\r\n * This function is similar to goog.string.path.baseName, except it can take a\r\n * list of characters to split the string on. It will return the rightmost\r\n * grouping of characters to the right of any separator as a left-to-right\r\n * oriented string.\r\n *\r\n * @see goog.string.path.baseName\r\n * @param {string} str The string\r\n * @param {string|!Array<string>} separators A list of separator characters\r\n * @return {string} The last part of the string with respect to the separators\r\n */\r\ngoog.string.lastComponent = function(str, separators) {\r\n  if (!separators) {\r\n    return str;\r\n  } else if (typeof separators == 'string') {\r\n    separators = [separators];\r\n  }\r\n\r\n  var lastSeparatorIndex = -1;\r\n  for (var i = 0; i < separators.length; i++) {\r\n    if (separators[i] == '') {\r\n      continue;\r\n    }\r\n    var currentSeparatorIndex = str.lastIndexOf(separators[i]);\r\n    if (currentSeparatorIndex > lastSeparatorIndex) {\r\n      lastSeparatorIndex = currentSeparatorIndex;\r\n    }\r\n  }\r\n  if (lastSeparatorIndex == -1) {\r\n    return str;\r\n  }\r\n  return str.slice(lastSeparatorIndex + 1);\r\n};\r\n\r\n\r\n/**\r\n * Computes the Levenshtein edit distance between two strings.\r\n * @param {string} a\r\n * @param {string} b\r\n * @return {number} The edit distance between the two strings.\r\n */\r\ngoog.string.editDistance = function(a, b) {\r\n  var v0 = [];\r\n  var v1 = [];\r\n\r\n  if (a == b) {\r\n    return 0;\r\n  }\r\n\r\n  if (!a.length || !b.length) {\r\n    return Math.max(a.length, b.length);\r\n  }\r\n\r\n  for (var i = 0; i < b.length + 1; i++) {\r\n    v0[i] = i;\r\n  }\r\n\r\n  for (var i = 0; i < a.length; i++) {\r\n    v1[0] = i + 1;\r\n\r\n    for (var j = 0; j < b.length; j++) {\r\n      var cost = Number(a[i] != b[j]);\r\n      // Cost for the substring is the minimum of adding one character, removing\r\n      // one character, or a swap.\r\n      v1[j + 1] = Math.min(v1[j] + 1, v0[j + 1] + 1, v0[j] + cost);\r\n    }\r\n\r\n    for (var j = 0; j < v0.length; j++) {\r\n      v0[j] = v1[j];\r\n    }\r\n  }\r\n\r\n  return v1[b.length];\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Generics method for collection-like classes and objects.\r\n *\r\n * @author arv@google.com (Erik Arvidsson)\r\n *\r\n * This file contains functions to work with collections. It supports using\r\n * Map, Set, Array and Object and other classes that implement collection-like\r\n * methods.\r\n * @suppress {strictMissingProperties}\r\n */\r\n\r\n\r\ngoog.provide('goog.structs');\r\n\r\ngoog.require('goog.array');\r\ngoog.require('goog.object');\r\n\r\n\r\n// We treat an object as a dictionary if it has getKeys or it is an object that\r\n// isn't arrayLike.\r\n\r\n\r\n/**\r\n * Returns the number of values in the collection-like object.\r\n * @param {Object} col The collection-like object.\r\n * @return {number} The number of values in the collection-like object.\r\n */\r\ngoog.structs.getCount = function(col) {\r\n  if (col.getCount && typeof col.getCount == 'function') {\r\n    return col.getCount();\r\n  }\r\n  if (goog.isArrayLike(col) || goog.isString(col)) {\r\n    return col.length;\r\n  }\r\n  return goog.object.getCount(col);\r\n};\r\n\r\n\r\n/**\r\n * Returns the values of the collection-like object.\r\n * @param {Object} col The collection-like object.\r\n * @return {!Array<?>} The values in the collection-like object.\r\n */\r\ngoog.structs.getValues = function(col) {\r\n  if (col.getValues && typeof col.getValues == 'function') {\r\n    return col.getValues();\r\n  }\r\n  if (goog.isString(col)) {\r\n    return col.split('');\r\n  }\r\n  if (goog.isArrayLike(col)) {\r\n    var rv = [];\r\n    var l = col.length;\r\n    for (var i = 0; i < l; i++) {\r\n      rv.push(col[i]);\r\n    }\r\n    return rv;\r\n  }\r\n  return goog.object.getValues(col);\r\n};\r\n\r\n\r\n/**\r\n * Returns the keys of the collection. Some collections have no notion of\r\n * keys/indexes and this function will return undefined in those cases.\r\n * @param {Object} col The collection-like object.\r\n * @return {!Array|undefined} The keys in the collection.\r\n */\r\ngoog.structs.getKeys = function(col) {\r\n  if (col.getKeys && typeof col.getKeys == 'function') {\r\n    return col.getKeys();\r\n  }\r\n  // if we have getValues but no getKeys we know this is a key-less collection\r\n  if (col.getValues && typeof col.getValues == 'function') {\r\n    return undefined;\r\n  }\r\n  if (goog.isArrayLike(col) || goog.isString(col)) {\r\n    var rv = [];\r\n    var l = col.length;\r\n    for (var i = 0; i < l; i++) {\r\n      rv.push(i);\r\n    }\r\n    return rv;\r\n  }\r\n\r\n  return goog.object.getKeys(col);\r\n};\r\n\r\n\r\n/**\r\n * Whether the collection contains the given value. This is O(n) and uses\r\n * equals (==) to test the existence.\r\n * @param {Object} col The collection-like object.\r\n * @param {*} val The value to check for.\r\n * @return {boolean} True if the map contains the value.\r\n */\r\ngoog.structs.contains = function(col, val) {\r\n  if (col.contains && typeof col.contains == 'function') {\r\n    return col.contains(val);\r\n  }\r\n  if (col.containsValue && typeof col.containsValue == 'function') {\r\n    return col.containsValue(val);\r\n  }\r\n  if (goog.isArrayLike(col) || goog.isString(col)) {\r\n    return goog.array.contains(/** @type {!Array<?>} */ (col), val);\r\n  }\r\n  return goog.object.containsValue(col, val);\r\n};\r\n\r\n\r\n/**\r\n * Whether the collection is empty.\r\n * @param {Object} col The collection-like object.\r\n * @return {boolean} True if empty.\r\n */\r\ngoog.structs.isEmpty = function(col) {\r\n  if (col.isEmpty && typeof col.isEmpty == 'function') {\r\n    return col.isEmpty();\r\n  }\r\n\r\n  // We do not use goog.string.isEmptyOrWhitespace because here we treat the\r\n  // string as\r\n  // collection and as such even whitespace matters\r\n\r\n  if (goog.isArrayLike(col) || goog.isString(col)) {\r\n    return goog.array.isEmpty(/** @type {!Array<?>} */ (col));\r\n  }\r\n  return goog.object.isEmpty(col);\r\n};\r\n\r\n\r\n/**\r\n * Removes all the elements from the collection.\r\n * @param {Object} col The collection-like object.\r\n */\r\ngoog.structs.clear = function(col) {\r\n  // NOTE(arv): This should not contain strings because strings are immutable\r\n  if (col.clear && typeof col.clear == 'function') {\r\n    col.clear();\r\n  } else if (goog.isArrayLike(col)) {\r\n    goog.array.clear(/** @type {IArrayLike<?>} */ (col));\r\n  } else {\r\n    goog.object.clear(col);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Calls a function for each value in a collection. The function takes\r\n * three arguments; the value, the key and the collection.\r\n *\r\n * @param {S} col The collection-like object.\r\n * @param {function(this:T,?,?,S):?} f The function to call for every value.\r\n *     This function takes\r\n *     3 arguments (the value, the key or undefined if the collection has no\r\n *     notion of keys, and the collection) and the return value is irrelevant.\r\n * @param {T=} opt_obj The object to be used as the value of 'this'\r\n *     within `f`.\r\n * @template T,S\r\n * @deprecated Use a more specific method, e.g. goog.array.forEach,\r\n *     goog.object.forEach, or for-of.\r\n */\r\ngoog.structs.forEach = function(col, f, opt_obj) {\r\n  if (col.forEach && typeof col.forEach == 'function') {\r\n    col.forEach(f, opt_obj);\r\n  } else if (goog.isArrayLike(col) || goog.isString(col)) {\r\n    goog.array.forEach(/** @type {!Array<?>} */ (col), f, opt_obj);\r\n  } else {\r\n    var keys = goog.structs.getKeys(col);\r\n    var values = goog.structs.getValues(col);\r\n    var l = values.length;\r\n    for (var i = 0; i < l; i++) {\r\n      f.call(/** @type {?} */ (opt_obj), values[i], keys && keys[i], col);\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Calls a function for every value in the collection. When a call returns true,\r\n * adds the value to a new collection (Array is returned by default).\r\n *\r\n * @param {S} col The collection-like object.\r\n * @param {function(this:T,?,?,S):boolean} f The function to call for every\r\n *     value. This function takes\r\n *     3 arguments (the value, the key or undefined if the collection has no\r\n *     notion of keys, and the collection) and should return a Boolean. If the\r\n *     return value is true the value is added to the result collection. If it\r\n *     is false the value is not included.\r\n * @param {T=} opt_obj The object to be used as the value of 'this'\r\n *     within `f`.\r\n * @return {!Object|!Array<?>} A new collection where the passed values are\r\n *     present. If col is a key-less collection an array is returned.  If col\r\n *     has keys and values a plain old JS object is returned.\r\n * @template T,S\r\n */\r\ngoog.structs.filter = function(col, f, opt_obj) {\r\n  if (typeof col.filter == 'function') {\r\n    return col.filter(f, opt_obj);\r\n  }\r\n  if (goog.isArrayLike(col) || goog.isString(col)) {\r\n    return goog.array.filter(/** @type {!Array<?>} */ (col), f, opt_obj);\r\n  }\r\n\r\n  var rv;\r\n  var keys = goog.structs.getKeys(col);\r\n  var values = goog.structs.getValues(col);\r\n  var l = values.length;\r\n  if (keys) {\r\n    rv = {};\r\n    for (var i = 0; i < l; i++) {\r\n      if (f.call(/** @type {?} */ (opt_obj), values[i], keys[i], col)) {\r\n        rv[keys[i]] = values[i];\r\n      }\r\n    }\r\n  } else {\r\n    // We should not use goog.array.filter here since we want to make sure that\r\n    // the index is undefined as well as make sure that col is passed to the\r\n    // function.\r\n    rv = [];\r\n    for (var i = 0; i < l; i++) {\r\n      if (f.call(opt_obj, values[i], undefined, col)) {\r\n        rv.push(values[i]);\r\n      }\r\n    }\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Calls a function for every value in the collection and adds the result into a\r\n * new collection (defaults to creating a new Array).\r\n *\r\n * @param {S} col The collection-like object.\r\n * @param {function(this:T,?,?,S):V} f The function to call for every value.\r\n *     This function takes 3 arguments (the value, the key or undefined if the\r\n *     collection has no notion of keys, and the collection) and should return\r\n *     something. The result will be used as the value in the new collection.\r\n * @param {T=} opt_obj  The object to be used as the value of 'this'\r\n *     within `f`.\r\n * @return {!Object<V>|!Array<V>} A new collection with the new values.  If\r\n *     col is a key-less collection an array is returned.  If col has keys and\r\n *     values a plain old JS object is returned.\r\n * @template T,S,V\r\n */\r\ngoog.structs.map = function(col, f, opt_obj) {\r\n  if (typeof col.map == 'function') {\r\n    return col.map(f, opt_obj);\r\n  }\r\n  if (goog.isArrayLike(col) || goog.isString(col)) {\r\n    return goog.array.map(/** @type {!Array<?>} */ (col), f, opt_obj);\r\n  }\r\n\r\n  var rv;\r\n  var keys = goog.structs.getKeys(col);\r\n  var values = goog.structs.getValues(col);\r\n  var l = values.length;\r\n  if (keys) {\r\n    rv = {};\r\n    for (var i = 0; i < l; i++) {\r\n      rv[keys[i]] = f.call(/** @type {?} */ (opt_obj), values[i], keys[i], col);\r\n    }\r\n  } else {\r\n    // We should not use goog.array.map here since we want to make sure that\r\n    // the index is undefined as well as make sure that col is passed to the\r\n    // function.\r\n    rv = [];\r\n    for (var i = 0; i < l; i++) {\r\n      rv[i] = f.call(/** @type {?} */ (opt_obj), values[i], undefined, col);\r\n    }\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Calls f for each value in a collection. If any call returns true this returns\r\n * true (without checking the rest). If all returns false this returns false.\r\n *\r\n * @param {S} col The collection-like object.\r\n * @param {function(this:T,?,?,S):boolean} f The function to call for every\r\n *     value. This function takes 3 arguments (the value, the key or undefined\r\n *     if the collection has no notion of keys, and the collection) and should\r\n *     return a boolean.\r\n * @param {T=} opt_obj  The object to be used as the value of 'this'\r\n *     within `f`.\r\n * @return {boolean} True if any value passes the test.\r\n * @template T,S\r\n */\r\ngoog.structs.some = function(col, f, opt_obj) {\r\n  if (typeof col.some == 'function') {\r\n    return col.some(f, opt_obj);\r\n  }\r\n  if (goog.isArrayLike(col) || goog.isString(col)) {\r\n    return goog.array.some(/** @type {!Array<?>} */ (col), f, opt_obj);\r\n  }\r\n  var keys = goog.structs.getKeys(col);\r\n  var values = goog.structs.getValues(col);\r\n  var l = values.length;\r\n  for (var i = 0; i < l; i++) {\r\n    if (f.call(/** @type {?} */ (opt_obj), values[i], keys && keys[i], col)) {\r\n      return true;\r\n    }\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Calls f for each value in a collection. If all calls return true this return\r\n * true this returns true. If any returns false this returns false at this point\r\n *  and does not continue to check the remaining values.\r\n *\r\n * @param {S} col The collection-like object.\r\n * @param {function(this:T,?,?,S):boolean} f The function to call for every\r\n *     value. This function takes 3 arguments (the value, the key or\r\n *     undefined if the collection has no notion of keys, and the collection)\r\n *     and should return a boolean.\r\n * @param {T=} opt_obj  The object to be used as the value of 'this'\r\n *     within `f`.\r\n * @return {boolean} True if all key-value pairs pass the test.\r\n * @template T,S\r\n */\r\ngoog.structs.every = function(col, f, opt_obj) {\r\n  if (typeof col.every == 'function') {\r\n    return col.every(f, opt_obj);\r\n  }\r\n  if (goog.isArrayLike(col) || goog.isString(col)) {\r\n    return goog.array.every(/** @type {!Array<?>} */ (col), f, opt_obj);\r\n  }\r\n  var keys = goog.structs.getKeys(col);\r\n  var values = goog.structs.getValues(col);\r\n  var l = values.length;\r\n  for (var i = 0; i < l; i++) {\r\n    if (!f.call(/** @type {?} */ (opt_obj), values[i], keys && keys[i], col)) {\r\n      return false;\r\n    }\r\n  }\r\n  return true;\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Datastructure: Hash Map.\r\n *\r\n * @author arv@google.com (Erik Arvidsson)\r\n *\r\n * This file contains an implementation of a Map structure. It implements a lot\r\n * of the methods used in goog.structs so those functions work on hashes. This\r\n * is best suited for complex key types. For simple keys such as numbers and\r\n * strings consider using the lighter-weight utilities in goog.object.\r\n */\r\n\r\n\r\ngoog.provide('goog.structs.Map');\r\n\r\ngoog.require('goog.iter.Iterator');\r\ngoog.require('goog.iter.StopIteration');\r\n\r\n\r\n\r\n/**\r\n * Class for Hash Map datastructure.\r\n * @param {*=} opt_map Map or Object to initialize the map with.\r\n * @param {...*} var_args If 2 or more arguments are present then they\r\n *     will be used as key-value pairs.\r\n * @constructor\r\n * @template K, V\r\n * @deprecated This type is misleading: use ES6 Map instead.\r\n */\r\ngoog.structs.Map = function(opt_map, var_args) {\r\n\r\n  /**\r\n   * Underlying JS object used to implement the map.\r\n   * @private {!Object}\r\n   */\r\n  this.map_ = {};\r\n\r\n  /**\r\n   * An array of keys. This is necessary for two reasons:\r\n   *   1. Iterating the keys using for (var key in this.map_) allocates an\r\n   *      object for every key in IE which is really bad for IE6 GC perf.\r\n   *   2. Without a side data structure, we would need to escape all the keys\r\n   *      as that would be the only way we could tell during iteration if the\r\n   *      key was an internal key or a property of the object.\r\n   *\r\n   * This array can contain deleted keys so it's necessary to check the map\r\n   * as well to see if the key is still in the map (this doesn't require a\r\n   * memory allocation in IE).\r\n   * @private {!Array<string>}\r\n   */\r\n  this.keys_ = [];\r\n\r\n  /**\r\n   * The number of key value pairs in the map.\r\n   * @private {number}\r\n   */\r\n  this.count_ = 0;\r\n\r\n  /**\r\n   * Version used to detect changes while iterating.\r\n   * @private {number}\r\n   */\r\n  this.version_ = 0;\r\n\r\n  var argLength = arguments.length;\r\n\r\n  if (argLength > 1) {\r\n    if (argLength % 2) {\r\n      throw new Error('Uneven number of arguments');\r\n    }\r\n    for (var i = 0; i < argLength; i += 2) {\r\n      this.set(arguments[i], arguments[i + 1]);\r\n    }\r\n  } else if (opt_map) {\r\n    this.addAll(/** @type {!Object} */ (opt_map));\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {number} The number of key-value pairs in the map.\r\n */\r\ngoog.structs.Map.prototype.getCount = function() {\r\n  return this.count_;\r\n};\r\n\r\n\r\n/**\r\n * Returns the values of the map.\r\n * @return {!Array<V>} The values in the map.\r\n */\r\ngoog.structs.Map.prototype.getValues = function() {\r\n  this.cleanupKeysArray_();\r\n\r\n  var rv = [];\r\n  for (var i = 0; i < this.keys_.length; i++) {\r\n    var key = this.keys_[i];\r\n    rv.push(this.map_[key]);\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Returns the keys of the map.\r\n * @return {!Array<string>} Array of string values.\r\n */\r\ngoog.structs.Map.prototype.getKeys = function() {\r\n  this.cleanupKeysArray_();\r\n  return /** @type {!Array<string>} */ (this.keys_.concat());\r\n};\r\n\r\n\r\n/**\r\n * Whether the map contains the given key.\r\n * @param {*} key The key to check for.\r\n * @return {boolean} Whether the map contains the key.\r\n */\r\ngoog.structs.Map.prototype.containsKey = function(key) {\r\n  return goog.structs.Map.hasKey_(this.map_, key);\r\n};\r\n\r\n\r\n/**\r\n * Whether the map contains the given value. This is O(n).\r\n * @param {V} val The value to check for.\r\n * @return {boolean} Whether the map contains the value.\r\n */\r\ngoog.structs.Map.prototype.containsValue = function(val) {\r\n  for (var i = 0; i < this.keys_.length; i++) {\r\n    var key = this.keys_[i];\r\n    if (goog.structs.Map.hasKey_(this.map_, key) && this.map_[key] == val) {\r\n      return true;\r\n    }\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Whether this map is equal to the argument map.\r\n * @param {goog.structs.Map} otherMap The map against which to test equality.\r\n * @param {function(V, V): boolean=} opt_equalityFn Optional equality function\r\n *     to test equality of values. If not specified, this will test whether\r\n *     the values contained in each map are identical objects.\r\n * @return {boolean} Whether the maps are equal.\r\n */\r\ngoog.structs.Map.prototype.equals = function(otherMap, opt_equalityFn) {\r\n  if (this === otherMap) {\r\n    return true;\r\n  }\r\n\r\n  if (this.count_ != otherMap.getCount()) {\r\n    return false;\r\n  }\r\n\r\n  var equalityFn = opt_equalityFn || goog.structs.Map.defaultEquals;\r\n\r\n  this.cleanupKeysArray_();\r\n  for (var key, i = 0; key = this.keys_[i]; i++) {\r\n    if (!equalityFn(this.get(key), otherMap.get(key))) {\r\n      return false;\r\n    }\r\n  }\r\n\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * Default equality test for values.\r\n * @param {*} a The first value.\r\n * @param {*} b The second value.\r\n * @return {boolean} Whether a and b reference the same object.\r\n */\r\ngoog.structs.Map.defaultEquals = function(a, b) {\r\n  return a === b;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the map is empty.\r\n */\r\ngoog.structs.Map.prototype.isEmpty = function() {\r\n  return this.count_ == 0;\r\n};\r\n\r\n\r\n/**\r\n * Removes all key-value pairs from the map.\r\n */\r\ngoog.structs.Map.prototype.clear = function() {\r\n  this.map_ = {};\r\n  this.keys_.length = 0;\r\n  this.count_ = 0;\r\n  this.version_ = 0;\r\n};\r\n\r\n\r\n/**\r\n * Removes a key-value pair based on the key. This is O(logN) amortized due to\r\n * updating the keys array whenever the count becomes half the size of the keys\r\n * in the keys array.\r\n * @param {*} key  The key to remove.\r\n * @return {boolean} Whether object was removed.\r\n */\r\ngoog.structs.Map.prototype.remove = function(key) {\r\n  if (goog.structs.Map.hasKey_(this.map_, key)) {\r\n    delete this.map_[key];\r\n    this.count_--;\r\n    this.version_++;\r\n\r\n    // clean up the keys array if the threshold is hit\r\n    if (this.keys_.length > 2 * this.count_) {\r\n      this.cleanupKeysArray_();\r\n    }\r\n\r\n    return true;\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Cleans up the temp keys array by removing entries that are no longer in the\r\n * map.\r\n * @private\r\n */\r\ngoog.structs.Map.prototype.cleanupKeysArray_ = function() {\r\n  if (this.count_ != this.keys_.length) {\r\n    // First remove keys that are no longer in the map.\r\n    var srcIndex = 0;\r\n    var destIndex = 0;\r\n    while (srcIndex < this.keys_.length) {\r\n      var key = this.keys_[srcIndex];\r\n      if (goog.structs.Map.hasKey_(this.map_, key)) {\r\n        this.keys_[destIndex++] = key;\r\n      }\r\n      srcIndex++;\r\n    }\r\n    this.keys_.length = destIndex;\r\n  }\r\n\r\n  if (this.count_ != this.keys_.length) {\r\n    // If the count still isn't correct, that means we have duplicates. This can\r\n    // happen when the same key is added and removed multiple times. Now we have\r\n    // to allocate one extra Object to remove the duplicates. This could have\r\n    // been done in the first pass, but in the common case, we can avoid\r\n    // allocating an extra object by only doing this when necessary.\r\n    var seen = {};\r\n    var srcIndex = 0;\r\n    var destIndex = 0;\r\n    while (srcIndex < this.keys_.length) {\r\n      var key = this.keys_[srcIndex];\r\n      if (!(goog.structs.Map.hasKey_(seen, key))) {\r\n        this.keys_[destIndex++] = key;\r\n        seen[key] = 1;\r\n      }\r\n      srcIndex++;\r\n    }\r\n    this.keys_.length = destIndex;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Returns the value for the given key.  If the key is not found and the default\r\n * value is not given this will return `undefined`.\r\n * @param {*} key The key to get the value for.\r\n * @param {DEFAULT=} opt_val The value to return if no item is found for the\r\n *     given key, defaults to undefined.\r\n * @return {V|DEFAULT} The value for the given key.\r\n * @template DEFAULT\r\n */\r\ngoog.structs.Map.prototype.get = function(key, opt_val) {\r\n  if (goog.structs.Map.hasKey_(this.map_, key)) {\r\n    return this.map_[key];\r\n  }\r\n  return opt_val;\r\n};\r\n\r\n\r\n/**\r\n * Adds a key-value pair to the map.\r\n * @param {*} key The key.\r\n * @param {V} value The value to add.\r\n * @return {*} Some subclasses return a value.\r\n */\r\ngoog.structs.Map.prototype.set = function(key, value) {\r\n  if (!(goog.structs.Map.hasKey_(this.map_, key))) {\r\n    this.count_++;\r\n    // TODO(johnlenz): This class lies, it claims to return an array of string\r\n    // keys, but instead returns the original object used.\r\n    this.keys_.push(/** @type {?} */ (key));\r\n    // Only change the version if we add a new key.\r\n    this.version_++;\r\n  }\r\n  this.map_[key] = value;\r\n};\r\n\r\n\r\n/**\r\n * Adds multiple key-value pairs from another goog.structs.Map or Object.\r\n * @param {?Object} map Object containing the data to add.\r\n */\r\ngoog.structs.Map.prototype.addAll = function(map) {\r\n  if (map instanceof goog.structs.Map) {\r\n    var keys = map.getKeys();\r\n    for (var i = 0; i < keys.length; i++) {\r\n      this.set(keys[i], map.get(keys[i]));\r\n    }\r\n  } else {\r\n    for (var key in map) {\r\n      this.set(key, map[key]);\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Calls the given function on each entry in the map.\r\n * @param {function(this:T, V, K, goog.structs.Map<K,V>)} f\r\n * @param {T=} opt_obj The value of \"this\" inside f.\r\n * @template T\r\n */\r\ngoog.structs.Map.prototype.forEach = function(f, opt_obj) {\r\n  var keys = this.getKeys();\r\n  for (var i = 0; i < keys.length; i++) {\r\n    var key = keys[i];\r\n    var value = this.get(key);\r\n    f.call(opt_obj, value, key, this);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Clones a map and returns a new map.\r\n * @return {!goog.structs.Map} A new map with the same key-value pairs.\r\n */\r\ngoog.structs.Map.prototype.clone = function() {\r\n  return new goog.structs.Map(this);\r\n};\r\n\r\n\r\n/**\r\n * Returns a new map in which all the keys and values are interchanged\r\n * (keys become values and values become keys). If multiple keys map to the\r\n * same value, the chosen transposed value is implementation-dependent.\r\n *\r\n * It acts very similarly to {goog.object.transpose(Object)}.\r\n *\r\n * @return {!goog.structs.Map} The transposed map.\r\n */\r\ngoog.structs.Map.prototype.transpose = function() {\r\n  var transposed = new goog.structs.Map();\r\n  for (var i = 0; i < this.keys_.length; i++) {\r\n    var key = this.keys_[i];\r\n    var value = this.map_[key];\r\n    transposed.set(value, key);\r\n  }\r\n\r\n  return transposed;\r\n};\r\n\r\n\r\n/**\r\n * @return {!Object} Object representation of the map.\r\n */\r\ngoog.structs.Map.prototype.toObject = function() {\r\n  this.cleanupKeysArray_();\r\n  var obj = {};\r\n  for (var i = 0; i < this.keys_.length; i++) {\r\n    var key = this.keys_[i];\r\n    obj[key] = this.map_[key];\r\n  }\r\n  return obj;\r\n};\r\n\r\n\r\n/**\r\n * Returns an iterator that iterates over the keys in the map.  Removal of keys\r\n * while iterating might have undesired side effects.\r\n * @return {!goog.iter.Iterator} An iterator over the keys in the map.\r\n */\r\ngoog.structs.Map.prototype.getKeyIterator = function() {\r\n  return this.__iterator__(true);\r\n};\r\n\r\n\r\n/**\r\n * Returns an iterator that iterates over the values in the map.  Removal of\r\n * keys while iterating might have undesired side effects.\r\n * @return {!goog.iter.Iterator} An iterator over the values in the map.\r\n */\r\ngoog.structs.Map.prototype.getValueIterator = function() {\r\n  return this.__iterator__(false);\r\n};\r\n\r\n\r\n/**\r\n * Returns an iterator that iterates over the values or the keys in the map.\r\n * This throws an exception if the map was mutated since the iterator was\r\n * created.\r\n * @param {boolean=} opt_keys True to iterate over the keys. False to iterate\r\n *     over the values.  The default value is false.\r\n * @return {!goog.iter.Iterator} An iterator over the values or keys in the map.\r\n */\r\ngoog.structs.Map.prototype.__iterator__ = function(opt_keys) {\r\n  // Clean up keys to minimize the risk of iterating over dead keys.\r\n  this.cleanupKeysArray_();\r\n\r\n  var i = 0;\r\n  var version = this.version_;\r\n  var selfObj = this;\r\n\r\n  var newIter = new goog.iter.Iterator;\r\n  newIter.next = function() {\r\n    if (version != selfObj.version_) {\r\n      throw new Error('The map has changed since the iterator was created');\r\n    }\r\n    if (i >= selfObj.keys_.length) {\r\n      throw goog.iter.StopIteration;\r\n    }\r\n    var key = selfObj.keys_[i++];\r\n    return opt_keys ? key : selfObj.map_[key];\r\n  };\r\n  return newIter;\r\n};\r\n\r\n\r\n/**\r\n * Safe way to test for hasOwnProperty.  It even allows testing for\r\n * 'hasOwnProperty'.\r\n * @param {!Object} obj The object to test for presence of the given key.\r\n * @param {*} key The key to check for.\r\n * @return {boolean} Whether the object has the key.\r\n * @private\r\n */\r\ngoog.structs.Map.hasKey_ = function(obj, key) {\r\n  return Object.prototype.hasOwnProperty.call(obj, key);\r\n};\r\n","// Copyright 2008 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Simple utilities for dealing with URI strings.\r\n *\r\n * This is intended to be a lightweight alternative to constructing goog.Uri\r\n * objects.  Whereas goog.Uri adds several kilobytes to the binary regardless\r\n * of how much of its functionality you use, this is designed to be a set of\r\n * mostly-independent utilities so that the compiler includes only what is\r\n * necessary for the task.  Estimated savings of porting is 5k pre-gzip and\r\n * 1.5k post-gzip.  To ensure the savings remain, future developers should\r\n * avoid adding new functionality to existing functions, but instead create\r\n * new ones and factor out shared code.\r\n *\r\n * Many of these utilities have limited functionality, tailored to common\r\n * cases.  The query parameter utilities assume that the parameter keys are\r\n * already encoded, since most keys are compile-time alphanumeric strings.  The\r\n * query parameter mutation utilities also do not tolerate fragment identifiers.\r\n *\r\n * By design, these functions can be slower than goog.Uri equivalents.\r\n * Repeated calls to some of functions may be quadratic in behavior for IE,\r\n * although the effect is somewhat limited given the 2kb limit.\r\n *\r\n * One advantage of the limited functionality here is that this approach is\r\n * less sensitive to differences in URI encodings than goog.Uri, since these\r\n * functions operate on strings directly, rather than decoding them and\r\n * then re-encoding.\r\n *\r\n * Uses features of RFC 3986 for parsing/formatting URIs:\r\n *   http://www.ietf.org/rfc/rfc3986.txt\r\n *\r\n * @author gboyer@google.com (Garrett Boyer) - The \"lightened\" design.\r\n * @author msamuel@google.com (Mike Samuel) - Domain knowledge and regexes.\r\n */\r\n\r\ngoog.provide('goog.uri.utils');\r\ngoog.provide('goog.uri.utils.ComponentIndex');\r\ngoog.provide('goog.uri.utils.QueryArray');\r\ngoog.provide('goog.uri.utils.QueryValue');\r\ngoog.provide('goog.uri.utils.StandardQueryParam');\r\n\r\ngoog.require('goog.array');\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.string');\r\n\r\n\r\n/**\r\n * Character codes inlined to avoid object allocations due to charCode.\r\n * @enum {number}\r\n * @private\r\n */\r\ngoog.uri.utils.CharCode_ = {\r\n  AMPERSAND: 38,\r\n  EQUAL: 61,\r\n  HASH: 35,\r\n  QUESTION: 63\r\n};\r\n\r\n\r\n/**\r\n * Builds a URI string from already-encoded parts.\r\n *\r\n * No encoding is performed.  Any component may be omitted as either null or\r\n * undefined.\r\n *\r\n * @param {?string=} opt_scheme The scheme such as 'http'.\r\n * @param {?string=} opt_userInfo The user name before the '@'.\r\n * @param {?string=} opt_domain The domain such as 'www.google.com', already\r\n *     URI-encoded.\r\n * @param {(string|number|null)=} opt_port The port number.\r\n * @param {?string=} opt_path The path, already URI-encoded.  If it is not\r\n *     empty, it must begin with a slash.\r\n * @param {?string=} opt_queryData The URI-encoded query data.\r\n * @param {?string=} opt_fragment The URI-encoded fragment identifier.\r\n * @return {string} The fully combined URI.\r\n */\r\ngoog.uri.utils.buildFromEncodedParts = function(\r\n    opt_scheme, opt_userInfo, opt_domain, opt_port, opt_path, opt_queryData,\r\n    opt_fragment) {\r\n  var out = '';\r\n\r\n  if (opt_scheme) {\r\n    out += opt_scheme + ':';\r\n  }\r\n\r\n  if (opt_domain) {\r\n    out += '//';\r\n\r\n    if (opt_userInfo) {\r\n      out += opt_userInfo + '@';\r\n    }\r\n\r\n    out += opt_domain;\r\n\r\n    if (opt_port) {\r\n      out += ':' + opt_port;\r\n    }\r\n  }\r\n\r\n  if (opt_path) {\r\n    out += opt_path;\r\n  }\r\n\r\n  if (opt_queryData) {\r\n    out += '?' + opt_queryData;\r\n  }\r\n\r\n  if (opt_fragment) {\r\n    out += '#' + opt_fragment;\r\n  }\r\n\r\n  return out;\r\n};\r\n\r\n\r\n/**\r\n * A regular expression for breaking a URI into its component parts.\r\n *\r\n * {@link http://www.ietf.org/rfc/rfc3986.txt} says in Appendix B\r\n * As the \"first-match-wins\" algorithm is identical to the \"greedy\"\r\n * disambiguation method used by POSIX regular expressions, it is natural and\r\n * commonplace to use a regular expression for parsing the potential five\r\n * components of a URI reference.\r\n *\r\n * The following line is the regular expression for breaking-down a\r\n * well-formed URI reference into its components.\r\n *\r\n * <pre>\r\n * ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\\?([^#]*))?(#(.*))?\r\n *  12            3  4          5       6  7        8 9\r\n * </pre>\r\n *\r\n * The numbers in the second line above are only to assist readability; they\r\n * indicate the reference points for each subexpression (i.e., each paired\r\n * parenthesis). We refer to the value matched for subexpression <n> as $<n>.\r\n * For example, matching the above expression to\r\n * <pre>\r\n *     http://www.ics.uci.edu/pub/ietf/uri/#Related\r\n * </pre>\r\n * results in the following subexpression matches:\r\n * <pre>\r\n *    $1 = http:\r\n *    $2 = http\r\n *    $3 = //www.ics.uci.edu\r\n *    $4 = www.ics.uci.edu\r\n *    $5 = /pub/ietf/uri/\r\n *    $6 = <undefined>\r\n *    $7 = <undefined>\r\n *    $8 = #Related\r\n *    $9 = Related\r\n * </pre>\r\n * where <undefined> indicates that the component is not present, as is the\r\n * case for the query component in the above example. Therefore, we can\r\n * determine the value of the five components as\r\n * <pre>\r\n *    scheme    = $2\r\n *    authority = $4\r\n *    path      = $5\r\n *    query     = $7\r\n *    fragment  = $9\r\n * </pre>\r\n *\r\n * The regular expression has been modified slightly to expose the\r\n * userInfo, domain, and port separately from the authority.\r\n * The modified version yields\r\n * <pre>\r\n *    $1 = http              scheme\r\n *    $2 = <undefined>       userInfo -\\\r\n *    $3 = www.ics.uci.edu   domain     | authority\r\n *    $4 = <undefined>       port     -/\r\n *    $5 = /pub/ietf/uri/    path\r\n *    $6 = <undefined>       query without ?\r\n *    $7 = Related           fragment without #\r\n * </pre>\r\n * @type {!RegExp}\r\n * @private\r\n */\r\ngoog.uri.utils.splitRe_ = new RegExp(\r\n    '^' +\r\n    '(?:' +\r\n    '([^:/?#.]+)' +  // scheme - ignore special characters\r\n                     // used by other URL parts such as :,\r\n                     // ?, /, #, and .\r\n    ':)?' +\r\n    '(?://' +\r\n    '(?:([^/?#]*)@)?' +  // userInfo\r\n    '([^/#?]*?)' +       // domain\r\n    '(?::([0-9]+))?' +   // port\r\n    '(?=[/#?]|$)' +      // authority-terminating character\r\n    ')?' +\r\n    '([^?#]+)?' +          // path\r\n    '(?:\\\\?([^#]*))?' +    // query\r\n    '(?:#([\\\\s\\\\S]*))?' +  // fragment\r\n    '$');\r\n\r\n\r\n/**\r\n * The index of each URI component in the return value of goog.uri.utils.split.\r\n * @enum {number}\r\n */\r\ngoog.uri.utils.ComponentIndex = {\r\n  SCHEME: 1,\r\n  USER_INFO: 2,\r\n  DOMAIN: 3,\r\n  PORT: 4,\r\n  PATH: 5,\r\n  QUERY_DATA: 6,\r\n  FRAGMENT: 7\r\n};\r\n\r\n\r\n/**\r\n * Splits a URI into its component parts.\r\n *\r\n * Each component can be accessed via the component indices; for example:\r\n * <pre>\r\n * goog.uri.utils.split(someStr)[goog.uri.utils.ComponentIndex.QUERY_DATA];\r\n * </pre>\r\n *\r\n * @param {string} uri The URI string to examine.\r\n * @return {!Array<string|undefined>} Each component still URI-encoded.\r\n *     Each component that is present will contain the encoded value, whereas\r\n *     components that are not present will be undefined or empty, depending\r\n *     on the browser's regular expression implementation.  Never null, since\r\n *     arbitrary strings may still look like path names.\r\n */\r\ngoog.uri.utils.split = function(uri) {\r\n  // See @return comment -- never null.\r\n  return /** @type {!Array<string|undefined>} */ (\r\n      uri.match(goog.uri.utils.splitRe_));\r\n};\r\n\r\n\r\n/**\r\n * @param {?string} uri A possibly null string.\r\n * @param {boolean=} opt_preserveReserved If true, percent-encoding of RFC-3986\r\n *     reserved characters will not be removed.\r\n * @return {?string} The string URI-decoded, or null if uri is null.\r\n * @private\r\n */\r\ngoog.uri.utils.decodeIfPossible_ = function(uri, opt_preserveReserved) {\r\n  if (!uri) {\r\n    return uri;\r\n  }\r\n\r\n  return opt_preserveReserved ? decodeURI(uri) : decodeURIComponent(uri);\r\n};\r\n\r\n\r\n/**\r\n * Gets a URI component by index.\r\n *\r\n * It is preferred to use the getPathEncoded() variety of functions ahead,\r\n * since they are more readable.\r\n *\r\n * @param {goog.uri.utils.ComponentIndex} componentIndex The component index.\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The still-encoded component, or null if the component\r\n *     is not present.\r\n * @private\r\n */\r\ngoog.uri.utils.getComponentByIndex_ = function(componentIndex, uri) {\r\n  // Convert undefined, null, and empty string into null.\r\n  return goog.uri.utils.split(uri)[componentIndex] || null;\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The protocol or scheme, or null if none.  Does not\r\n *     include trailing colons or slashes.\r\n */\r\ngoog.uri.utils.getScheme = function(uri) {\r\n  return goog.uri.utils.getComponentByIndex_(\r\n      goog.uri.utils.ComponentIndex.SCHEME, uri);\r\n};\r\n\r\n\r\n/**\r\n * Gets the effective scheme for the URL.  If the URL is relative then the\r\n * scheme is derived from the page's location.\r\n * @param {string} uri The URI to examine.\r\n * @return {string} The protocol or scheme, always lower case.\r\n */\r\ngoog.uri.utils.getEffectiveScheme = function(uri) {\r\n  var scheme = goog.uri.utils.getScheme(uri);\r\n  if (!scheme && goog.global.self && goog.global.self.location) {\r\n    var protocol = goog.global.self.location.protocol;\r\n    scheme = protocol.substr(0, protocol.length - 1);\r\n  }\r\n  // NOTE: When called from a web worker in Firefox 3.5, location may be null.\r\n  // All other browsers with web workers support self.location from the worker.\r\n  return scheme ? scheme.toLowerCase() : '';\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The user name still encoded, or null if none.\r\n */\r\ngoog.uri.utils.getUserInfoEncoded = function(uri) {\r\n  return goog.uri.utils.getComponentByIndex_(\r\n      goog.uri.utils.ComponentIndex.USER_INFO, uri);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The decoded user info, or null if none.\r\n */\r\ngoog.uri.utils.getUserInfo = function(uri) {\r\n  return goog.uri.utils.decodeIfPossible_(\r\n      goog.uri.utils.getUserInfoEncoded(uri));\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The domain name still encoded, or null if none.\r\n */\r\ngoog.uri.utils.getDomainEncoded = function(uri) {\r\n  return goog.uri.utils.getComponentByIndex_(\r\n      goog.uri.utils.ComponentIndex.DOMAIN, uri);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The decoded domain, or null if none.\r\n */\r\ngoog.uri.utils.getDomain = function(uri) {\r\n  return goog.uri.utils.decodeIfPossible_(\r\n      goog.uri.utils.getDomainEncoded(uri), true /* opt_preserveReserved */);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?number} The port number, or null if none.\r\n */\r\ngoog.uri.utils.getPort = function(uri) {\r\n  // Coerce to a number.  If the result of getComponentByIndex_ is null or\r\n  // non-numeric, the number coersion yields NaN.  This will then return\r\n  // null for all non-numeric cases (though also zero, which isn't a relevant\r\n  // port number).\r\n  return Number(\r\n             goog.uri.utils.getComponentByIndex_(\r\n                 goog.uri.utils.ComponentIndex.PORT, uri)) ||\r\n      null;\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The path still encoded, or null if none. Includes the\r\n *     leading slash, if any.\r\n */\r\ngoog.uri.utils.getPathEncoded = function(uri) {\r\n  return goog.uri.utils.getComponentByIndex_(\r\n      goog.uri.utils.ComponentIndex.PATH, uri);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The decoded path, or null if none.  Includes the leading\r\n *     slash, if any.\r\n */\r\ngoog.uri.utils.getPath = function(uri) {\r\n  return goog.uri.utils.decodeIfPossible_(\r\n      goog.uri.utils.getPathEncoded(uri), true /* opt_preserveReserved */);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The query data still encoded, or null if none.  Does not\r\n *     include the question mark itself.\r\n */\r\ngoog.uri.utils.getQueryData = function(uri) {\r\n  return goog.uri.utils.getComponentByIndex_(\r\n      goog.uri.utils.ComponentIndex.QUERY_DATA, uri);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The fragment identifier, or null if none.  Does not\r\n *     include the hash mark itself.\r\n */\r\ngoog.uri.utils.getFragmentEncoded = function(uri) {\r\n  // The hash mark may not appear in any other part of the URL.\r\n  var hashIndex = uri.indexOf('#');\r\n  return hashIndex < 0 ? null : uri.substr(hashIndex + 1);\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @param {?string} fragment The encoded fragment identifier, or null if none.\r\n *     Does not include the hash mark itself.\r\n * @return {string} The URI with the fragment set.\r\n */\r\ngoog.uri.utils.setFragmentEncoded = function(uri, fragment) {\r\n  return goog.uri.utils.removeFragment(uri) + (fragment ? '#' + fragment : '');\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri The URI to examine.\r\n * @return {?string} The decoded fragment identifier, or null if none.  Does\r\n *     not include the hash mark.\r\n */\r\ngoog.uri.utils.getFragment = function(uri) {\r\n  return goog.uri.utils.decodeIfPossible_(\r\n      goog.uri.utils.getFragmentEncoded(uri));\r\n};\r\n\r\n\r\n/**\r\n * Extracts everything up to the port of the URI.\r\n * @param {string} uri The URI string.\r\n * @return {string} Everything up to and including the port.\r\n */\r\ngoog.uri.utils.getHost = function(uri) {\r\n  var pieces = goog.uri.utils.split(uri);\r\n  return goog.uri.utils.buildFromEncodedParts(\r\n      pieces[goog.uri.utils.ComponentIndex.SCHEME],\r\n      pieces[goog.uri.utils.ComponentIndex.USER_INFO],\r\n      pieces[goog.uri.utils.ComponentIndex.DOMAIN],\r\n      pieces[goog.uri.utils.ComponentIndex.PORT]);\r\n};\r\n\r\n\r\n/**\r\n * Returns the origin for a given URL.\r\n * @param {string} uri The URI string.\r\n * @return {string} Everything up to and including the port.\r\n */\r\ngoog.uri.utils.getOrigin = function(uri) {\r\n  var pieces = goog.uri.utils.split(uri);\r\n  return goog.uri.utils.buildFromEncodedParts(\r\n      pieces[goog.uri.utils.ComponentIndex.SCHEME], null /* opt_userInfo */,\r\n      pieces[goog.uri.utils.ComponentIndex.DOMAIN],\r\n      pieces[goog.uri.utils.ComponentIndex.PORT]);\r\n};\r\n\r\n\r\n/**\r\n * Extracts the path of the URL and everything after.\r\n * @param {string} uri The URI string.\r\n * @return {string} The URI, starting at the path and including the query\r\n *     parameters and fragment identifier.\r\n */\r\ngoog.uri.utils.getPathAndAfter = function(uri) {\r\n  var pieces = goog.uri.utils.split(uri);\r\n  return goog.uri.utils.buildFromEncodedParts(\r\n      null, null, null, null, pieces[goog.uri.utils.ComponentIndex.PATH],\r\n      pieces[goog.uri.utils.ComponentIndex.QUERY_DATA],\r\n      pieces[goog.uri.utils.ComponentIndex.FRAGMENT]);\r\n};\r\n\r\n\r\n/**\r\n * Gets the URI with the fragment identifier removed.\r\n * @param {string} uri The URI to examine.\r\n * @return {string} Everything preceding the hash mark.\r\n */\r\ngoog.uri.utils.removeFragment = function(uri) {\r\n  // The hash mark may not appear in any other part of the URL.\r\n  var hashIndex = uri.indexOf('#');\r\n  return hashIndex < 0 ? uri : uri.substr(0, hashIndex);\r\n};\r\n\r\n\r\n/**\r\n * Ensures that two URI's have the exact same domain, scheme, and port.\r\n *\r\n * Unlike the version in goog.Uri, this checks protocol, and therefore is\r\n * suitable for checking against the browser's same-origin policy.\r\n *\r\n * @param {string} uri1 The first URI.\r\n * @param {string} uri2 The second URI.\r\n * @return {boolean} Whether they have the same scheme, domain and port.\r\n */\r\ngoog.uri.utils.haveSameDomain = function(uri1, uri2) {\r\n  var pieces1 = goog.uri.utils.split(uri1);\r\n  var pieces2 = goog.uri.utils.split(uri2);\r\n  return pieces1[goog.uri.utils.ComponentIndex.DOMAIN] ==\r\n      pieces2[goog.uri.utils.ComponentIndex.DOMAIN] &&\r\n      pieces1[goog.uri.utils.ComponentIndex.SCHEME] ==\r\n      pieces2[goog.uri.utils.ComponentIndex.SCHEME] &&\r\n      pieces1[goog.uri.utils.ComponentIndex.PORT] ==\r\n      pieces2[goog.uri.utils.ComponentIndex.PORT];\r\n};\r\n\r\n\r\n/**\r\n * Asserts that there are no fragment or query identifiers, only in uncompiled\r\n * mode.\r\n * @param {string} uri The URI to examine.\r\n * @private\r\n */\r\ngoog.uri.utils.assertNoFragmentsOrQueries_ = function(uri) {\r\n  goog.asserts.assert(\r\n      uri.indexOf('#') < 0 && uri.indexOf('?') < 0,\r\n      'goog.uri.utils: Fragment or query identifiers are not supported: [%s]',\r\n      uri);\r\n};\r\n\r\n\r\n/**\r\n * Supported query parameter values by the parameter serializing utilities.\r\n *\r\n * If a value is null or undefined, the key-value pair is skipped, as an easy\r\n * way to omit parameters conditionally.  Non-array parameters are converted\r\n * to a string and URI encoded.  Array values are expanded into multiple\r\n * &key=value pairs, with each element stringized and URI-encoded.\r\n *\r\n * @typedef {*}\r\n */\r\ngoog.uri.utils.QueryValue;\r\n\r\n\r\n/**\r\n * An array representing a set of query parameters with alternating keys\r\n * and values.\r\n *\r\n * Keys are assumed to be URI encoded already and live at even indices.  See\r\n * goog.uri.utils.QueryValue for details on how parameter values are encoded.\r\n *\r\n * Example:\r\n * <pre>\r\n * var data = [\r\n *   // Simple param: ?name=BobBarker\r\n *   'name', 'BobBarker',\r\n *   // Conditional param -- may be omitted entirely.\r\n *   'specialDietaryNeeds', hasDietaryNeeds() ? getDietaryNeeds() : null,\r\n *   // Multi-valued param: &house=LosAngeles&house=NewYork&house=null\r\n *   'house', ['LosAngeles', 'NewYork', null]\r\n * ];\r\n * </pre>\r\n *\r\n * @typedef {!Array<string|goog.uri.utils.QueryValue>}\r\n */\r\ngoog.uri.utils.QueryArray;\r\n\r\n\r\n/**\r\n * Parses encoded query parameters and calls callback function for every\r\n * parameter found in the string.\r\n *\r\n * Missing value of parameter (e.g. “…&key&…”) is treated as if the value was an\r\n * empty string.  Keys may be empty strings (e.g. “…&=value&…”) which also means\r\n * that “…&=&…” and “…&&…” will result in an empty key and value.\r\n *\r\n * @param {string} encodedQuery Encoded query string excluding question mark at\r\n *     the beginning.\r\n * @param {function(string, string)} callback Function called for every\r\n *     parameter found in query string.  The first argument (name) will not be\r\n *     urldecoded (so the function is consistent with buildQueryData), but the\r\n *     second will.  If the parameter has no value (i.e. “=” was not present)\r\n *     the second argument (value) will be an empty string.\r\n */\r\ngoog.uri.utils.parseQueryData = function(encodedQuery, callback) {\r\n  if (!encodedQuery) {\r\n    return;\r\n  }\r\n  var pairs = encodedQuery.split('&');\r\n  for (var i = 0; i < pairs.length; i++) {\r\n    var indexOfEquals = pairs[i].indexOf('=');\r\n    var name = null;\r\n    var value = null;\r\n    if (indexOfEquals >= 0) {\r\n      name = pairs[i].substring(0, indexOfEquals);\r\n      value = pairs[i].substring(indexOfEquals + 1);\r\n    } else {\r\n      name = pairs[i];\r\n    }\r\n    callback(name, value ? goog.string.urlDecode(value) : '');\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Split the URI into 3 parts where the [1] is the queryData without a leading\r\n * '?'. For example, the URI http://foo.com/bar?a=b#abc returns\r\n * ['http://foo.com/bar','a=b','#abc'].\r\n * @param {string} uri The URI to parse.\r\n * @return {!Array<string>} An array representation of uri of length 3 where the\r\n *     middle value is the queryData without a leading '?'.\r\n * @private\r\n */\r\ngoog.uri.utils.splitQueryData_ = function(uri) {\r\n  // Find the query data and hash.\r\n  var hashIndex = uri.indexOf('#');\r\n  if (hashIndex < 0) {\r\n    hashIndex = uri.length;\r\n  }\r\n  var questionIndex = uri.indexOf('?');\r\n  var queryData;\r\n  if (questionIndex < 0 || questionIndex > hashIndex) {\r\n    questionIndex = hashIndex;\r\n    queryData = '';\r\n  } else {\r\n    queryData = uri.substring(questionIndex + 1, hashIndex);\r\n  }\r\n  return [uri.substr(0, questionIndex), queryData, uri.substr(hashIndex)];\r\n};\r\n\r\n\r\n/**\r\n * Join an array created by splitQueryData_ back into a URI.\r\n * @param {!Array<string>} parts A URI in the form generated by splitQueryData_.\r\n * @return {string} The joined URI.\r\n * @private\r\n */\r\ngoog.uri.utils.joinQueryData_ = function(parts) {\r\n  return parts[0] + (parts[1] ? '?' + parts[1] : '') + parts[2];\r\n};\r\n\r\n\r\n/**\r\n * @param {string} queryData\r\n * @param {string} newData\r\n * @return {string}\r\n * @private\r\n */\r\ngoog.uri.utils.appendQueryData_ = function(queryData, newData) {\r\n  if (!newData) {\r\n    return queryData;\r\n  }\r\n  return queryData ? queryData + '&' + newData : newData;\r\n};\r\n\r\n\r\n/**\r\n * @param {string} uri\r\n * @param {string} queryData\r\n * @return {string}\r\n * @private\r\n */\r\ngoog.uri.utils.appendQueryDataToUri_ = function(uri, queryData) {\r\n  if (!queryData) {\r\n    return uri;\r\n  }\r\n  var parts = goog.uri.utils.splitQueryData_(uri);\r\n  parts[1] = goog.uri.utils.appendQueryData_(parts[1], queryData);\r\n  return goog.uri.utils.joinQueryData_(parts);\r\n};\r\n\r\n\r\n/**\r\n * Appends key=value pairs to an array, supporting multi-valued objects.\r\n * @param {*} key The key prefix.\r\n * @param {goog.uri.utils.QueryValue} value The value to serialize.\r\n * @param {!Array<string>} pairs The array to which the 'key=value' strings\r\n *     should be appended.\r\n * @private\r\n */\r\ngoog.uri.utils.appendKeyValuePairs_ = function(key, value, pairs) {\r\n  goog.asserts.assertString(key);\r\n  if (goog.isArray(value)) {\r\n    // Convince the compiler it's an array.\r\n    goog.asserts.assertArray(value);\r\n    for (var j = 0; j < value.length; j++) {\r\n      // Convert to string explicitly, to short circuit the null and array\r\n      // logic in this function -- this ensures that null and undefined get\r\n      // written as literal 'null' and 'undefined', and arrays don't get\r\n      // expanded out but instead encoded in the default way.\r\n      goog.uri.utils.appendKeyValuePairs_(key, String(value[j]), pairs);\r\n    }\r\n  } else if (value != null) {\r\n    // Skip a top-level null or undefined entirely.\r\n    pairs.push(\r\n        key +\r\n        // Check for empty string. Zero gets encoded into the url as literal\r\n        // strings.  For empty string, skip the equal sign, to be consistent\r\n        // with UriBuilder.java.\r\n        (value === '' ? '' : '=' + goog.string.urlEncode(value)));\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Builds a query data string from a sequence of alternating keys and values.\r\n * Currently generates \"&key&\" for empty args.\r\n *\r\n * @param {!IArrayLike<string|goog.uri.utils.QueryValue>} keysAndValues\r\n *     Alternating keys and values. See the QueryArray typedef.\r\n * @param {number=} opt_startIndex A start offset into the arary, defaults to 0.\r\n * @return {string} The encoded query string, in the form 'a=1&b=2'.\r\n */\r\ngoog.uri.utils.buildQueryData = function(keysAndValues, opt_startIndex) {\r\n  goog.asserts.assert(\r\n      Math.max(keysAndValues.length - (opt_startIndex || 0), 0) % 2 == 0,\r\n      'goog.uri.utils: Key/value lists must be even in length.');\r\n\r\n  var params = [];\r\n  for (var i = opt_startIndex || 0; i < keysAndValues.length; i += 2) {\r\n    var key = /** @type {string} */ (keysAndValues[i]);\r\n    goog.uri.utils.appendKeyValuePairs_(key, keysAndValues[i + 1], params);\r\n  }\r\n  return params.join('&');\r\n};\r\n\r\n\r\n/**\r\n * Builds a query data string from a map.\r\n * Currently generates \"&key&\" for empty args.\r\n *\r\n * @param {!Object<string, goog.uri.utils.QueryValue>} map An object where keys\r\n *     are URI-encoded parameter keys, and the values are arbitrary types\r\n *     or arrays. Keys with a null value are dropped.\r\n * @return {string} The encoded query string, in the form 'a=1&b=2'.\r\n */\r\ngoog.uri.utils.buildQueryDataFromMap = function(map) {\r\n  var params = [];\r\n  for (var key in map) {\r\n    goog.uri.utils.appendKeyValuePairs_(key, map[key], params);\r\n  }\r\n  return params.join('&');\r\n};\r\n\r\n\r\n/**\r\n * Appends URI parameters to an existing URI.\r\n *\r\n * The variable arguments may contain alternating keys and values.  Keys are\r\n * assumed to be already URI encoded.  The values should not be URI-encoded,\r\n * and will instead be encoded by this function.\r\n * <pre>\r\n * appendParams('http://www.foo.com?existing=true',\r\n *     'key1', 'value1',\r\n *     'key2', 'value?willBeEncoded',\r\n *     'key3', ['valueA', 'valueB', 'valueC'],\r\n *     'key4', null);\r\n * result: 'http://www.foo.com?existing=true&' +\r\n *     'key1=value1&' +\r\n *     'key2=value%3FwillBeEncoded&' +\r\n *     'key3=valueA&key3=valueB&key3=valueC'\r\n * </pre>\r\n *\r\n * A single call to this function will not exhibit quadratic behavior in IE,\r\n * whereas multiple repeated calls may, although the effect is limited by\r\n * fact that URL's generally can't exceed 2kb.\r\n *\r\n * @param {string} uri The original URI, which may already have query data.\r\n * @param {...(goog.uri.utils.QueryArray|goog.uri.utils.QueryValue)}\r\n * var_args\r\n *     An array or argument list conforming to goog.uri.utils.QueryArray.\r\n * @return {string} The URI with all query parameters added.\r\n */\r\ngoog.uri.utils.appendParams = function(uri, var_args) {\r\n  var queryData = arguments.length == 2 ?\r\n      goog.uri.utils.buildQueryData(arguments[1], 0) :\r\n      goog.uri.utils.buildQueryData(arguments, 1);\r\n  return goog.uri.utils.appendQueryDataToUri_(uri, queryData);\r\n};\r\n\r\n\r\n/**\r\n * Appends query parameters from a map.\r\n *\r\n * @param {string} uri The original URI, which may already have query data.\r\n * @param {!Object<goog.uri.utils.QueryValue>} map An object where keys are\r\n *     URI-encoded parameter keys, and the values are arbitrary types or arrays.\r\n *     Keys with a null value are dropped.\r\n * @return {string} The new parameters.\r\n */\r\ngoog.uri.utils.appendParamsFromMap = function(uri, map) {\r\n  var queryData = goog.uri.utils.buildQueryDataFromMap(map);\r\n  return goog.uri.utils.appendQueryDataToUri_(uri, queryData);\r\n};\r\n\r\n\r\n/**\r\n * Appends a single URI parameter.\r\n *\r\n * Repeated calls to this can exhibit quadratic behavior in IE6 due to the\r\n * way string append works, though it should be limited given the 2kb limit.\r\n *\r\n * @param {string} uri The original URI, which may already have query data.\r\n * @param {string} key The key, which must already be URI encoded.\r\n * @param {*=} opt_value The value, which will be stringized and encoded\r\n *     (assumed not already to be encoded).  If omitted, undefined, or null, the\r\n *     key will be added as a valueless parameter.\r\n * @return {string} The URI with the query parameter added.\r\n */\r\ngoog.uri.utils.appendParam = function(uri, key, opt_value) {\r\n  var value = goog.isDefAndNotNull(opt_value) ?\r\n      '=' + goog.string.urlEncode(opt_value) :\r\n      '';\r\n  return goog.uri.utils.appendQueryDataToUri_(uri, key + value);\r\n};\r\n\r\n\r\n/**\r\n * Finds the next instance of a query parameter with the specified name.\r\n *\r\n * Does not instantiate any objects.\r\n *\r\n * @param {string} uri The URI to search.  May contain a fragment identifier\r\n *     if opt_hashIndex is specified.\r\n * @param {number} startIndex The index to begin searching for the key at.  A\r\n *     match may be found even if this is one character after the ampersand.\r\n * @param {string} keyEncoded The URI-encoded key.\r\n * @param {number} hashOrEndIndex Index to stop looking at.  If a hash\r\n *     mark is present, it should be its index, otherwise it should be the\r\n *     length of the string.\r\n * @return {number} The position of the first character in the key's name,\r\n *     immediately after either a question mark or a dot.\r\n * @private\r\n */\r\ngoog.uri.utils.findParam_ = function(\r\n    uri, startIndex, keyEncoded, hashOrEndIndex) {\r\n  var index = startIndex;\r\n  var keyLength = keyEncoded.length;\r\n\r\n  // Search for the key itself and post-filter for surronuding punctuation,\r\n  // rather than expensively building a regexp.\r\n  while ((index = uri.indexOf(keyEncoded, index)) >= 0 &&\r\n         index < hashOrEndIndex) {\r\n    var precedingChar = uri.charCodeAt(index - 1);\r\n    // Ensure that the preceding character is '&' or '?'.\r\n    if (precedingChar == goog.uri.utils.CharCode_.AMPERSAND ||\r\n        precedingChar == goog.uri.utils.CharCode_.QUESTION) {\r\n      // Ensure the following character is '&', '=', '#', or NaN\r\n      // (end of string).\r\n      var followingChar = uri.charCodeAt(index + keyLength);\r\n      if (!followingChar || followingChar == goog.uri.utils.CharCode_.EQUAL ||\r\n          followingChar == goog.uri.utils.CharCode_.AMPERSAND ||\r\n          followingChar == goog.uri.utils.CharCode_.HASH) {\r\n        return index;\r\n      }\r\n    }\r\n    index += keyLength + 1;\r\n  }\r\n\r\n  return -1;\r\n};\r\n\r\n\r\n/**\r\n * Regular expression for finding a hash mark or end of string.\r\n * @type {RegExp}\r\n * @private\r\n */\r\ngoog.uri.utils.hashOrEndRe_ = /#|$/;\r\n\r\n\r\n/**\r\n * Determines if the URI contains a specific key.\r\n *\r\n * Performs no object instantiations.\r\n *\r\n * @param {string} uri The URI to process.  May contain a fragment\r\n *     identifier.\r\n * @param {string} keyEncoded The URI-encoded key.  Case-sensitive.\r\n * @return {boolean} Whether the key is present.\r\n */\r\ngoog.uri.utils.hasParam = function(uri, keyEncoded) {\r\n  return goog.uri.utils.findParam_(\r\n             uri, 0, keyEncoded, uri.search(goog.uri.utils.hashOrEndRe_)) >= 0;\r\n};\r\n\r\n\r\n/**\r\n * Gets the first value of a query parameter.\r\n * @param {string} uri The URI to process.  May contain a fragment.\r\n * @param {string} keyEncoded The URI-encoded key.  Case-sensitive.\r\n * @return {?string} The first value of the parameter (URI-decoded), or null\r\n *     if the parameter is not found.\r\n */\r\ngoog.uri.utils.getParamValue = function(uri, keyEncoded) {\r\n  var hashOrEndIndex = uri.search(goog.uri.utils.hashOrEndRe_);\r\n  var foundIndex =\r\n      goog.uri.utils.findParam_(uri, 0, keyEncoded, hashOrEndIndex);\r\n\r\n  if (foundIndex < 0) {\r\n    return null;\r\n  } else {\r\n    var endPosition = uri.indexOf('&', foundIndex);\r\n    if (endPosition < 0 || endPosition > hashOrEndIndex) {\r\n      endPosition = hashOrEndIndex;\r\n    }\r\n    // Progress forth to the end of the \"key=\" or \"key&\" substring.\r\n    foundIndex += keyEncoded.length + 1;\r\n    // Use substr, because it (unlike substring) will return empty string\r\n    // if foundIndex > endPosition.\r\n    return goog.string.urlDecode(\r\n        uri.substr(foundIndex, endPosition - foundIndex));\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Gets all values of a query parameter.\r\n * @param {string} uri The URI to process.  May contain a fragment.\r\n * @param {string} keyEncoded The URI-encoded key.  Case-sensitive.\r\n * @return {!Array<string>} All URI-decoded values with the given key.\r\n *     If the key is not found, this will have length 0, but never be null.\r\n */\r\ngoog.uri.utils.getParamValues = function(uri, keyEncoded) {\r\n  var hashOrEndIndex = uri.search(goog.uri.utils.hashOrEndRe_);\r\n  var position = 0;\r\n  var foundIndex;\r\n  var result = [];\r\n\r\n  while ((foundIndex = goog.uri.utils.findParam_(\r\n              uri, position, keyEncoded, hashOrEndIndex)) >= 0) {\r\n    // Find where this parameter ends, either the '&' or the end of the\r\n    // query parameters.\r\n    position = uri.indexOf('&', foundIndex);\r\n    if (position < 0 || position > hashOrEndIndex) {\r\n      position = hashOrEndIndex;\r\n    }\r\n\r\n    // Progress forth to the end of the \"key=\" or \"key&\" substring.\r\n    foundIndex += keyEncoded.length + 1;\r\n    // Use substr, because it (unlike substring) will return empty string\r\n    // if foundIndex > position.\r\n    result.push(\r\n        goog.string.urlDecode(uri.substr(foundIndex, position - foundIndex)));\r\n  }\r\n\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * Regexp to find trailing question marks and ampersands.\r\n * @type {RegExp}\r\n * @private\r\n */\r\ngoog.uri.utils.trailingQueryPunctuationRe_ = /[?&]($|#)/;\r\n\r\n\r\n/**\r\n * Removes all instances of a query parameter.\r\n * @param {string} uri The URI to process.  Must not contain a fragment.\r\n * @param {string} keyEncoded The URI-encoded key.\r\n * @return {string} The URI with all instances of the parameter removed.\r\n */\r\ngoog.uri.utils.removeParam = function(uri, keyEncoded) {\r\n  var hashOrEndIndex = uri.search(goog.uri.utils.hashOrEndRe_);\r\n  var position = 0;\r\n  var foundIndex;\r\n  var buffer = [];\r\n\r\n  // Look for a query parameter.\r\n  while ((foundIndex = goog.uri.utils.findParam_(\r\n              uri, position, keyEncoded, hashOrEndIndex)) >= 0) {\r\n    // Get the portion of the query string up to, but not including, the ?\r\n    // or & starting the parameter.\r\n    buffer.push(uri.substring(position, foundIndex));\r\n    // Progress to immediately after the '&'.  If not found, go to the end.\r\n    // Avoid including the hash mark.\r\n    position = Math.min(\r\n        (uri.indexOf('&', foundIndex) + 1) || hashOrEndIndex, hashOrEndIndex);\r\n  }\r\n\r\n  // Append everything that is remaining.\r\n  buffer.push(uri.substr(position));\r\n\r\n  // Join the buffer, and remove trailing punctuation that remains.\r\n  return buffer.join('').replace(\r\n      goog.uri.utils.trailingQueryPunctuationRe_, '$1');\r\n};\r\n\r\n\r\n/**\r\n * Replaces all existing definitions of a parameter with a single definition.\r\n *\r\n * Repeated calls to this can exhibit quadratic behavior due to the need to\r\n * find existing instances and reconstruct the string, though it should be\r\n * limited given the 2kb limit.  Consider using appendParams or setParamsFromMap\r\n * to update multiple parameters in bulk.\r\n *\r\n * @param {string} uri The original URI, which may already have query data.\r\n * @param {string} keyEncoded The key, which must already be URI encoded.\r\n * @param {*} value The value, which will be stringized and encoded (assumed\r\n *     not already to be encoded).\r\n * @return {string} The URI with the query parameter added.\r\n */\r\ngoog.uri.utils.setParam = function(uri, keyEncoded, value) {\r\n  return goog.uri.utils.appendParam(\r\n      goog.uri.utils.removeParam(uri, keyEncoded), keyEncoded, value);\r\n};\r\n\r\n\r\n/**\r\n * Effeciently set or remove multiple query parameters in a URI. Order of\r\n * unchanged parameters will not be modified, all updated parameters will be\r\n * appended to the end of the query. Params with values of null or undefined are\r\n * removed.\r\n *\r\n * @param {string} uri The URI to process.\r\n * @param {!Object<string, goog.uri.utils.QueryValue>} params A list of\r\n *     parameters to update. If null or undefined, the param will be removed.\r\n * @return {string} An updated URI where the query data has been updated with\r\n *     the params.\r\n */\r\ngoog.uri.utils.setParamsFromMap = function(uri, params) {\r\n  var parts = goog.uri.utils.splitQueryData_(uri);\r\n  var queryData = parts[1];\r\n  var buffer = [];\r\n  if (queryData) {\r\n    goog.array.forEach(queryData.split('&'), function(pair) {\r\n      var indexOfEquals = pair.indexOf('=');\r\n      var name = indexOfEquals >= 0 ? pair.substr(0, indexOfEquals) : pair;\r\n      if (!params.hasOwnProperty(name)) {\r\n        buffer.push(pair);\r\n      }\r\n    });\r\n  }\r\n  parts[1] = goog.uri.utils.appendQueryData_(\r\n      buffer.join('&'), goog.uri.utils.buildQueryDataFromMap(params));\r\n  return goog.uri.utils.joinQueryData_(parts);\r\n};\r\n\r\n\r\n/**\r\n * Generates a URI path using a given URI and a path with checks to\r\n * prevent consecutive \"//\". The baseUri passed in must not contain\r\n * query or fragment identifiers. The path to append may not contain query or\r\n * fragment identifiers.\r\n *\r\n * @param {string} baseUri URI to use as the base.\r\n * @param {string} path Path to append.\r\n * @return {string} Updated URI.\r\n */\r\ngoog.uri.utils.appendPath = function(baseUri, path) {\r\n  goog.uri.utils.assertNoFragmentsOrQueries_(baseUri);\r\n\r\n  // Remove any trailing '/'\r\n  if (goog.string.endsWith(baseUri, '/')) {\r\n    baseUri = baseUri.substr(0, baseUri.length - 1);\r\n  }\r\n  // Remove any leading '/'\r\n  if (goog.string.startsWith(path, '/')) {\r\n    path = path.substr(1);\r\n  }\r\n  return goog.string.buildString(baseUri, '/', path);\r\n};\r\n\r\n\r\n/**\r\n * Replaces the path.\r\n * @param {string} uri URI to use as the base.\r\n * @param {string} path New path.\r\n * @return {string} Updated URI.\r\n */\r\ngoog.uri.utils.setPath = function(uri, path) {\r\n  // Add any missing '/'.\r\n  if (!goog.string.startsWith(path, '/')) {\r\n    path = '/' + path;\r\n  }\r\n  var parts = goog.uri.utils.split(uri);\r\n  return goog.uri.utils.buildFromEncodedParts(\r\n      parts[goog.uri.utils.ComponentIndex.SCHEME],\r\n      parts[goog.uri.utils.ComponentIndex.USER_INFO],\r\n      parts[goog.uri.utils.ComponentIndex.DOMAIN],\r\n      parts[goog.uri.utils.ComponentIndex.PORT], path,\r\n      parts[goog.uri.utils.ComponentIndex.QUERY_DATA],\r\n      parts[goog.uri.utils.ComponentIndex.FRAGMENT]);\r\n};\r\n\r\n\r\n/**\r\n * Standard supported query parameters.\r\n * @enum {string}\r\n */\r\ngoog.uri.utils.StandardQueryParam = {\r\n\r\n  /** Unused parameter for unique-ifying. */\r\n  RANDOM: 'zx'\r\n};\r\n\r\n\r\n/**\r\n * Sets the zx parameter of a URI to a random value.\r\n * @param {string} uri Any URI.\r\n * @return {string} That URI with the \"zx\" parameter added or replaced to\r\n *     contain a random string.\r\n */\r\ngoog.uri.utils.makeUnique = function(uri) {\r\n  return goog.uri.utils.setParam(\r\n      uri, goog.uri.utils.StandardQueryParam.RANDOM,\r\n      goog.string.getRandomString());\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Class for parsing and formatting URIs.\r\n *\r\n * Use goog.Uri(string) to parse a URI string.  Use goog.Uri.create(...) to\r\n * create a new instance of the goog.Uri object from Uri parts.\r\n *\r\n * e.g: <code>var myUri = new goog.Uri(window.location);</code>\r\n *\r\n * Implements RFC 3986 for parsing/formatting URIs.\r\n * http://www.ietf.org/rfc/rfc3986.txt\r\n *\r\n * Some changes have been made to the interface (more like .NETs), though the\r\n * internal representation is now of un-encoded parts, this will change the\r\n * behavior slightly.\r\n *\r\n * @author msamuel@google.com (Mike Samuel)\r\n */\r\n\r\ngoog.provide('goog.Uri');\r\ngoog.provide('goog.Uri.QueryData');\r\n\r\ngoog.require('goog.array');\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.string');\r\ngoog.require('goog.structs');\r\ngoog.require('goog.structs.Map');\r\ngoog.require('goog.uri.utils');\r\ngoog.require('goog.uri.utils.ComponentIndex');\r\ngoog.require('goog.uri.utils.StandardQueryParam');\r\n\r\n\r\n\r\n/**\r\n * This class contains setters and getters for the parts of the URI.\r\n * The <code>getXyz</code>/<code>setXyz</code> methods return the decoded part\r\n * -- so<code>goog.Uri.parse('/foo%20bar').getPath()</code> will return the\r\n * decoded path, <code>/foo bar</code>.\r\n *\r\n * Reserved characters (see RFC 3986 section 2.2) can be present in\r\n * their percent-encoded form in scheme, domain, and path URI components and\r\n * will not be auto-decoded. For example:\r\n * <code>goog.Uri.parse('rel%61tive/path%2fto/resource').getPath()</code> will\r\n * return <code>relative/path%2fto/resource</code>.\r\n *\r\n * The constructor accepts an optional unparsed, raw URI string.  The parser\r\n * is relaxed, so special characters that aren't escaped but don't cause\r\n * ambiguities will not cause parse failures.\r\n *\r\n * All setters return <code>this</code> and so may be chained, a la\r\n * <code>goog.Uri.parse('/foo').setFragment('part').toString()</code>.\r\n *\r\n * @param {*=} opt_uri Optional string URI to parse\r\n *        (use goog.Uri.create() to create a URI from parts), or if\r\n *        a goog.Uri is passed, a clone is created.\r\n * @param {boolean=} opt_ignoreCase If true, #getParameterValue will ignore\r\n * the case of the parameter name.\r\n *\r\n * @throws URIError If opt_uri is provided and URI is malformed (that is,\r\n *     if decodeURIComponent fails on any of the URI components).\r\n * @constructor\r\n * @struct\r\n */\r\ngoog.Uri = function(opt_uri, opt_ignoreCase) {\r\n  /**\r\n   * Scheme such as \"http\".\r\n   * @private {string}\r\n   */\r\n  this.scheme_ = '';\r\n\r\n  /**\r\n   * User credentials in the form \"username:password\".\r\n   * @private {string}\r\n   */\r\n  this.userInfo_ = '';\r\n\r\n  /**\r\n   * Domain part, e.g. \"www.google.com\".\r\n   * @private {string}\r\n   */\r\n  this.domain_ = '';\r\n\r\n  /**\r\n   * Port, e.g. 8080.\r\n   * @private {?number}\r\n   */\r\n  this.port_ = null;\r\n\r\n  /**\r\n   * Path, e.g. \"/tests/img.png\".\r\n   * @private {string}\r\n   */\r\n  this.path_ = '';\r\n\r\n  /**\r\n   * The fragment without the #.\r\n   * @private {string}\r\n   */\r\n  this.fragment_ = '';\r\n\r\n  /**\r\n   * Whether or not this Uri should be treated as Read Only.\r\n   * @private {boolean}\r\n   */\r\n  this.isReadOnly_ = false;\r\n\r\n  /**\r\n   * Whether or not to ignore case when comparing query params.\r\n   * @private {boolean}\r\n   */\r\n  this.ignoreCase_ = false;\r\n\r\n  /**\r\n   * Object representing query data.\r\n   * @private {!goog.Uri.QueryData}\r\n   */\r\n  this.queryData_;\r\n\r\n  // Parse in the uri string\r\n  var m;\r\n  if (opt_uri instanceof goog.Uri) {\r\n    this.ignoreCase_ =\r\n        goog.isDef(opt_ignoreCase) ? opt_ignoreCase : opt_uri.getIgnoreCase();\r\n    this.setScheme(opt_uri.getScheme());\r\n    this.setUserInfo(opt_uri.getUserInfo());\r\n    this.setDomain(opt_uri.getDomain());\r\n    this.setPort(opt_uri.getPort());\r\n    this.setPath(opt_uri.getPath());\r\n    this.setQueryData(opt_uri.getQueryData().clone());\r\n    this.setFragment(opt_uri.getFragment());\r\n  } else if (opt_uri && (m = goog.uri.utils.split(String(opt_uri)))) {\r\n    this.ignoreCase_ = !!opt_ignoreCase;\r\n\r\n    // Set the parts -- decoding as we do so.\r\n    // COMPATIBILITY NOTE - In IE, unmatched fields may be empty strings,\r\n    // whereas in other browsers they will be undefined.\r\n    this.setScheme(m[goog.uri.utils.ComponentIndex.SCHEME] || '', true);\r\n    this.setUserInfo(m[goog.uri.utils.ComponentIndex.USER_INFO] || '', true);\r\n    this.setDomain(m[goog.uri.utils.ComponentIndex.DOMAIN] || '', true);\r\n    this.setPort(m[goog.uri.utils.ComponentIndex.PORT]);\r\n    this.setPath(m[goog.uri.utils.ComponentIndex.PATH] || '', true);\r\n    this.setQueryData(m[goog.uri.utils.ComponentIndex.QUERY_DATA] || '', true);\r\n    this.setFragment(m[goog.uri.utils.ComponentIndex.FRAGMENT] || '', true);\r\n\r\n  } else {\r\n    this.ignoreCase_ = !!opt_ignoreCase;\r\n    this.queryData_ = new goog.Uri.QueryData(null, null, this.ignoreCase_);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Parameter name added to stop caching.\r\n * @type {string}\r\n */\r\ngoog.Uri.RANDOM_PARAM = goog.uri.utils.StandardQueryParam.RANDOM;\r\n\r\n\r\n/**\r\n * @return {string} The string form of the url.\r\n * @override\r\n */\r\ngoog.Uri.prototype.toString = function() {\r\n  var out = [];\r\n\r\n  var scheme = this.getScheme();\r\n  if (scheme) {\r\n    out.push(\r\n        goog.Uri.encodeSpecialChars_(\r\n            scheme, goog.Uri.reDisallowedInSchemeOrUserInfo_, true),\r\n        ':');\r\n  }\r\n\r\n  var domain = this.getDomain();\r\n  if (domain || scheme == 'file') {\r\n    out.push('//');\r\n\r\n    var userInfo = this.getUserInfo();\r\n    if (userInfo) {\r\n      out.push(\r\n          goog.Uri.encodeSpecialChars_(\r\n              userInfo, goog.Uri.reDisallowedInSchemeOrUserInfo_, true),\r\n          '@');\r\n    }\r\n\r\n    out.push(goog.Uri.removeDoubleEncoding_(goog.string.urlEncode(domain)));\r\n\r\n    var port = this.getPort();\r\n    if (port != null) {\r\n      out.push(':', String(port));\r\n    }\r\n  }\r\n\r\n  var path = this.getPath();\r\n  if (path) {\r\n    if (this.hasDomain() && path.charAt(0) != '/') {\r\n      out.push('/');\r\n    }\r\n    out.push(\r\n        goog.Uri.encodeSpecialChars_(\r\n            path, path.charAt(0) == '/' ? goog.Uri.reDisallowedInAbsolutePath_ :\r\n                                          goog.Uri.reDisallowedInRelativePath_,\r\n            true));\r\n  }\r\n\r\n  var query = this.getEncodedQuery();\r\n  if (query) {\r\n    out.push('?', query);\r\n  }\r\n\r\n  var fragment = this.getFragment();\r\n  if (fragment) {\r\n    out.push(\r\n        '#', goog.Uri.encodeSpecialChars_(\r\n                 fragment, goog.Uri.reDisallowedInFragment_));\r\n  }\r\n  return out.join('');\r\n};\r\n\r\n\r\n/**\r\n * Resolves the given relative URI (a goog.Uri object), using the URI\r\n * represented by this instance as the base URI.\r\n *\r\n * There are several kinds of relative URIs:<br>\r\n * 1. foo - replaces the last part of the path, the whole query and fragment<br>\r\n * 2. /foo - replaces the path, the query and fragment<br>\r\n * 3. //foo - replaces everything from the domain on.  foo is a domain name<br>\r\n * 4. ?foo - replace the query and fragment<br>\r\n * 5. #foo - replace the fragment only\r\n *\r\n * Additionally, if relative URI has a non-empty path, all \"..\" and \".\"\r\n * segments will be resolved, as described in RFC 3986.\r\n *\r\n * @param {!goog.Uri} relativeUri The relative URI to resolve.\r\n * @return {!goog.Uri} The resolved URI.\r\n */\r\ngoog.Uri.prototype.resolve = function(relativeUri) {\r\n\r\n  var absoluteUri = this.clone();\r\n\r\n  // we satisfy these conditions by looking for the first part of relativeUri\r\n  // that is not blank and applying defaults to the rest\r\n\r\n  var overridden = relativeUri.hasScheme();\r\n\r\n  if (overridden) {\r\n    absoluteUri.setScheme(relativeUri.getScheme());\r\n  } else {\r\n    overridden = relativeUri.hasUserInfo();\r\n  }\r\n\r\n  if (overridden) {\r\n    absoluteUri.setUserInfo(relativeUri.getUserInfo());\r\n  } else {\r\n    overridden = relativeUri.hasDomain();\r\n  }\r\n\r\n  if (overridden) {\r\n    absoluteUri.setDomain(relativeUri.getDomain());\r\n  } else {\r\n    overridden = relativeUri.hasPort();\r\n  }\r\n\r\n  var path = relativeUri.getPath();\r\n  if (overridden) {\r\n    absoluteUri.setPort(relativeUri.getPort());\r\n  } else {\r\n    overridden = relativeUri.hasPath();\r\n    if (overridden) {\r\n      // resolve path properly\r\n      if (path.charAt(0) != '/') {\r\n        // path is relative\r\n        if (this.hasDomain() && !this.hasPath()) {\r\n          // RFC 3986, section 5.2.3, case 1\r\n          path = '/' + path;\r\n        } else {\r\n          // RFC 3986, section 5.2.3, case 2\r\n          var lastSlashIndex = absoluteUri.getPath().lastIndexOf('/');\r\n          if (lastSlashIndex != -1) {\r\n            path = absoluteUri.getPath().substr(0, lastSlashIndex + 1) + path;\r\n          }\r\n        }\r\n      }\r\n      path = goog.Uri.removeDotSegments(path);\r\n    }\r\n  }\r\n\r\n  if (overridden) {\r\n    absoluteUri.setPath(path);\r\n  } else {\r\n    overridden = relativeUri.hasQuery();\r\n  }\r\n\r\n  if (overridden) {\r\n    absoluteUri.setQueryData(relativeUri.getQueryData().clone());\r\n  } else {\r\n    overridden = relativeUri.hasFragment();\r\n  }\r\n\r\n  if (overridden) {\r\n    absoluteUri.setFragment(relativeUri.getFragment());\r\n  }\r\n\r\n  return absoluteUri;\r\n};\r\n\r\n\r\n/**\r\n * Clones the URI instance.\r\n * @return {!goog.Uri} New instance of the URI object.\r\n */\r\ngoog.Uri.prototype.clone = function() {\r\n  return new goog.Uri(this);\r\n};\r\n\r\n\r\n/**\r\n * @return {string} The encoded scheme/protocol for the URI.\r\n */\r\ngoog.Uri.prototype.getScheme = function() {\r\n  return this.scheme_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the scheme/protocol.\r\n * @throws URIError If opt_decode is true and newScheme is malformed (that is,\r\n *     if decodeURIComponent fails).\r\n * @param {string} newScheme New scheme value.\r\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.setScheme = function(newScheme, opt_decode) {\r\n  this.enforceReadOnly();\r\n  this.scheme_ =\r\n      opt_decode ? goog.Uri.decodeOrEmpty_(newScheme, true) : newScheme;\r\n\r\n  // remove an : at the end of the scheme so somebody can pass in\r\n  // window.location.protocol\r\n  if (this.scheme_) {\r\n    this.scheme_ = this.scheme_.replace(/:$/, '');\r\n  }\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the scheme has been set.\r\n */\r\ngoog.Uri.prototype.hasScheme = function() {\r\n  return !!this.scheme_;\r\n};\r\n\r\n\r\n/**\r\n * @return {string} The decoded user info.\r\n */\r\ngoog.Uri.prototype.getUserInfo = function() {\r\n  return this.userInfo_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the userInfo.\r\n * @throws URIError If opt_decode is true and newUserInfo is malformed (that is,\r\n *     if decodeURIComponent fails).\r\n * @param {string} newUserInfo New userInfo value.\r\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.setUserInfo = function(newUserInfo, opt_decode) {\r\n  this.enforceReadOnly();\r\n  this.userInfo_ =\r\n      opt_decode ? goog.Uri.decodeOrEmpty_(newUserInfo) : newUserInfo;\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the user info has been set.\r\n */\r\ngoog.Uri.prototype.hasUserInfo = function() {\r\n  return !!this.userInfo_;\r\n};\r\n\r\n\r\n/**\r\n * @return {string} The decoded domain.\r\n */\r\ngoog.Uri.prototype.getDomain = function() {\r\n  return this.domain_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the domain.\r\n * @throws URIError If opt_decode is true and newDomain is malformed (that is,\r\n *     if decodeURIComponent fails).\r\n * @param {string} newDomain New domain value.\r\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.setDomain = function(newDomain, opt_decode) {\r\n  this.enforceReadOnly();\r\n  this.domain_ =\r\n      opt_decode ? goog.Uri.decodeOrEmpty_(newDomain, true) : newDomain;\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the domain has been set.\r\n */\r\ngoog.Uri.prototype.hasDomain = function() {\r\n  return !!this.domain_;\r\n};\r\n\r\n\r\n/**\r\n * @return {?number} The port number.\r\n */\r\ngoog.Uri.prototype.getPort = function() {\r\n  return this.port_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the port number.\r\n * @param {*} newPort Port number. Will be explicitly casted to a number.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.setPort = function(newPort) {\r\n  this.enforceReadOnly();\r\n\r\n  if (newPort) {\r\n    newPort = Number(newPort);\r\n    if (isNaN(newPort) || newPort < 0) {\r\n      throw new Error('Bad port number ' + newPort);\r\n    }\r\n    this.port_ = newPort;\r\n  } else {\r\n    this.port_ = null;\r\n  }\r\n\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the port has been set.\r\n */\r\ngoog.Uri.prototype.hasPort = function() {\r\n  return this.port_ != null;\r\n};\r\n\r\n\r\n/**\r\n  * @return {string} The decoded path.\r\n */\r\ngoog.Uri.prototype.getPath = function() {\r\n  return this.path_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the path.\r\n * @throws URIError If opt_decode is true and newPath is malformed (that is,\r\n *     if decodeURIComponent fails).\r\n * @param {string} newPath New path value.\r\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.setPath = function(newPath, opt_decode) {\r\n  this.enforceReadOnly();\r\n  this.path_ = opt_decode ? goog.Uri.decodeOrEmpty_(newPath, true) : newPath;\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the path has been set.\r\n */\r\ngoog.Uri.prototype.hasPath = function() {\r\n  return !!this.path_;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the query string has been set.\r\n */\r\ngoog.Uri.prototype.hasQuery = function() {\r\n  return this.queryData_.toString() !== '';\r\n};\r\n\r\n\r\n/**\r\n * Sets the query data.\r\n * @param {goog.Uri.QueryData|string|undefined} queryData QueryData object.\r\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\r\n *     Applies only if queryData is a string.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.setQueryData = function(queryData, opt_decode) {\r\n  this.enforceReadOnly();\r\n\r\n  if (queryData instanceof goog.Uri.QueryData) {\r\n    this.queryData_ = queryData;\r\n    this.queryData_.setIgnoreCase(this.ignoreCase_);\r\n  } else {\r\n    if (!opt_decode) {\r\n      // QueryData accepts encoded query string, so encode it if\r\n      // opt_decode flag is not true.\r\n      queryData = goog.Uri.encodeSpecialChars_(\r\n          queryData, goog.Uri.reDisallowedInQuery_);\r\n    }\r\n    this.queryData_ = new goog.Uri.QueryData(queryData, null, this.ignoreCase_);\r\n  }\r\n\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * Sets the URI query.\r\n * @param {string} newQuery New query value.\r\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.setQuery = function(newQuery, opt_decode) {\r\n  return this.setQueryData(newQuery, opt_decode);\r\n};\r\n\r\n\r\n/**\r\n * @return {string} The encoded URI query, not including the ?.\r\n */\r\ngoog.Uri.prototype.getEncodedQuery = function() {\r\n  return this.queryData_.toString();\r\n};\r\n\r\n\r\n/**\r\n * @return {string} The decoded URI query, not including the ?.\r\n */\r\ngoog.Uri.prototype.getDecodedQuery = function() {\r\n  return this.queryData_.toDecodedString();\r\n};\r\n\r\n\r\n/**\r\n * Returns the query data.\r\n * @return {!goog.Uri.QueryData} QueryData object.\r\n */\r\ngoog.Uri.prototype.getQueryData = function() {\r\n  return this.queryData_;\r\n};\r\n\r\n\r\n/**\r\n * @return {string} The encoded URI query, not including the ?.\r\n *\r\n * Warning: This method, unlike other getter methods, returns encoded\r\n * value, instead of decoded one.\r\n */\r\ngoog.Uri.prototype.getQuery = function() {\r\n  return this.getEncodedQuery();\r\n};\r\n\r\n\r\n/**\r\n * Sets the value of the named query parameters, clearing previous values for\r\n * that key.\r\n *\r\n * @param {string} key The parameter to set.\r\n * @param {*} value The new value. Value does not need to be encoded.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.setParameterValue = function(key, value) {\r\n  this.enforceReadOnly();\r\n  this.queryData_.set(key, value);\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * Sets the values of the named query parameters, clearing previous values for\r\n * that key.  Not new values will currently be moved to the end of the query\r\n * string.\r\n *\r\n * So, <code>goog.Uri.parse('foo?a=b&c=d&e=f').setParameterValues('c', ['new'])\r\n * </code> yields <tt>foo?a=b&e=f&c=new</tt>.</p>\r\n *\r\n * @param {string} key The parameter to set.\r\n * @param {*} values The new values. If values is a single\r\n *     string then it will be treated as the sole value. Values do not need to\r\n *     be encoded.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.setParameterValues = function(key, values) {\r\n  this.enforceReadOnly();\r\n\r\n  if (!goog.isArray(values)) {\r\n    values = [String(values)];\r\n  }\r\n\r\n  this.queryData_.setValues(key, values);\r\n\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * Returns the value<b>s</b> for a given cgi parameter as a list of decoded\r\n * query parameter values.\r\n * @param {string} name The parameter to get values for.\r\n * @return {!Array<?>} The values for a given cgi parameter as a list of\r\n *     decoded query parameter values.\r\n */\r\ngoog.Uri.prototype.getParameterValues = function(name) {\r\n  return this.queryData_.getValues(name);\r\n};\r\n\r\n\r\n/**\r\n * Returns the first value for a given cgi parameter or undefined if the given\r\n * parameter name does not appear in the query string.\r\n * @param {string} paramName Unescaped parameter name.\r\n * @return {string|undefined} The first value for a given cgi parameter or\r\n *     undefined if the given parameter name does not appear in the query\r\n *     string.\r\n */\r\ngoog.Uri.prototype.getParameterValue = function(paramName) {\r\n  return /** @type {string|undefined} */ (this.queryData_.get(paramName));\r\n};\r\n\r\n\r\n/**\r\n * @return {string} The URI fragment, not including the #.\r\n */\r\ngoog.Uri.prototype.getFragment = function() {\r\n  return this.fragment_;\r\n};\r\n\r\n\r\n/**\r\n * Sets the URI fragment.\r\n * @throws URIError If opt_decode is true and newFragment is malformed (that is,\r\n *     if decodeURIComponent fails).\r\n * @param {string} newFragment New fragment value.\r\n * @param {boolean=} opt_decode Optional param for whether to decode new value.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.setFragment = function(newFragment, opt_decode) {\r\n  this.enforceReadOnly();\r\n  this.fragment_ =\r\n      opt_decode ? goog.Uri.decodeOrEmpty_(newFragment) : newFragment;\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the URI has a fragment set.\r\n */\r\ngoog.Uri.prototype.hasFragment = function() {\r\n  return !!this.fragment_;\r\n};\r\n\r\n\r\n/**\r\n * Returns true if this has the same domain as that of uri2.\r\n * @param {!goog.Uri} uri2 The URI object to compare to.\r\n * @return {boolean} true if same domain; false otherwise.\r\n */\r\ngoog.Uri.prototype.hasSameDomainAs = function(uri2) {\r\n  return ((!this.hasDomain() && !uri2.hasDomain()) ||\r\n          this.getDomain() == uri2.getDomain()) &&\r\n      ((!this.hasPort() && !uri2.hasPort()) ||\r\n       this.getPort() == uri2.getPort());\r\n};\r\n\r\n\r\n/**\r\n * Adds a random parameter to the Uri.\r\n * @return {!goog.Uri} Reference to this Uri object.\r\n */\r\ngoog.Uri.prototype.makeUnique = function() {\r\n  this.enforceReadOnly();\r\n  this.setParameterValue(goog.Uri.RANDOM_PARAM, goog.string.getRandomString());\r\n\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * Removes the named query parameter.\r\n *\r\n * @param {string} key The parameter to remove.\r\n * @return {!goog.Uri} Reference to this URI object.\r\n */\r\ngoog.Uri.prototype.removeParameter = function(key) {\r\n  this.enforceReadOnly();\r\n  this.queryData_.remove(key);\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * Sets whether Uri is read only. If this goog.Uri is read-only,\r\n * enforceReadOnly_ will be called at the start of any function that may modify\r\n * this Uri.\r\n * @param {boolean} isReadOnly whether this goog.Uri should be read only.\r\n * @return {!goog.Uri} Reference to this Uri object.\r\n */\r\ngoog.Uri.prototype.setReadOnly = function(isReadOnly) {\r\n  this.isReadOnly_ = isReadOnly;\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether the URI is read only.\r\n */\r\ngoog.Uri.prototype.isReadOnly = function() {\r\n  return this.isReadOnly_;\r\n};\r\n\r\n\r\n/**\r\n * Checks if this Uri has been marked as read only, and if so, throws an error.\r\n * This should be called whenever any modifying function is called.\r\n */\r\ngoog.Uri.prototype.enforceReadOnly = function() {\r\n  if (this.isReadOnly_) {\r\n    throw new Error('Tried to modify a read-only Uri');\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Sets whether to ignore case.\r\n * NOTE: If there are already key/value pairs in the QueryData, and\r\n * ignoreCase_ is set to false, the keys will all be lower-cased.\r\n * @param {boolean} ignoreCase whether this goog.Uri should ignore case.\r\n * @return {!goog.Uri} Reference to this Uri object.\r\n */\r\ngoog.Uri.prototype.setIgnoreCase = function(ignoreCase) {\r\n  this.ignoreCase_ = ignoreCase;\r\n  if (this.queryData_) {\r\n    this.queryData_.setIgnoreCase(ignoreCase);\r\n  }\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether to ignore case.\r\n */\r\ngoog.Uri.prototype.getIgnoreCase = function() {\r\n  return this.ignoreCase_;\r\n};\r\n\r\n\r\n//==============================================================================\r\n// Static members\r\n//==============================================================================\r\n\r\n\r\n/**\r\n * Creates a uri from the string form.  Basically an alias of new goog.Uri().\r\n * If a Uri object is passed to parse then it will return a clone of the object.\r\n *\r\n * @throws URIError If parsing the URI is malformed. The passed URI components\r\n *     should all be parseable by decodeURIComponent.\r\n * @param {*} uri Raw URI string or instance of Uri\r\n *     object.\r\n * @param {boolean=} opt_ignoreCase Whether to ignore the case of parameter\r\n * names in #getParameterValue.\r\n * @return {!goog.Uri} The new URI object.\r\n */\r\ngoog.Uri.parse = function(uri, opt_ignoreCase) {\r\n  return uri instanceof goog.Uri ? uri.clone() :\r\n                                   new goog.Uri(uri, opt_ignoreCase);\r\n};\r\n\r\n\r\n/**\r\n * Creates a new goog.Uri object from unencoded parts.\r\n *\r\n * @param {?string=} opt_scheme Scheme/protocol or full URI to parse.\r\n * @param {?string=} opt_userInfo username:password.\r\n * @param {?string=} opt_domain www.google.com.\r\n * @param {?number=} opt_port 9830.\r\n * @param {?string=} opt_path /some/path/to/a/file.html.\r\n * @param {string|goog.Uri.QueryData=} opt_query a=1&b=2.\r\n * @param {?string=} opt_fragment The fragment without the #.\r\n * @param {boolean=} opt_ignoreCase Whether to ignore parameter name case in\r\n *     #getParameterValue.\r\n *\r\n * @return {!goog.Uri} The new URI object.\r\n */\r\ngoog.Uri.create = function(\r\n    opt_scheme, opt_userInfo, opt_domain, opt_port, opt_path, opt_query,\r\n    opt_fragment, opt_ignoreCase) {\r\n\r\n  var uri = new goog.Uri(null, opt_ignoreCase);\r\n\r\n  // Only set the parts if they are defined and not empty strings.\r\n  opt_scheme && uri.setScheme(opt_scheme);\r\n  opt_userInfo && uri.setUserInfo(opt_userInfo);\r\n  opt_domain && uri.setDomain(opt_domain);\r\n  opt_port && uri.setPort(opt_port);\r\n  opt_path && uri.setPath(opt_path);\r\n  opt_query && uri.setQueryData(opt_query);\r\n  opt_fragment && uri.setFragment(opt_fragment);\r\n\r\n  return uri;\r\n};\r\n\r\n\r\n/**\r\n * Resolves a relative Uri against a base Uri, accepting both strings and\r\n * Uri objects.\r\n *\r\n * @param {*} base Base Uri.\r\n * @param {*} rel Relative Uri.\r\n * @return {!goog.Uri} Resolved uri.\r\n */\r\ngoog.Uri.resolve = function(base, rel) {\r\n  if (!(base instanceof goog.Uri)) {\r\n    base = goog.Uri.parse(base);\r\n  }\r\n\r\n  if (!(rel instanceof goog.Uri)) {\r\n    rel = goog.Uri.parse(rel);\r\n  }\r\n\r\n  return base.resolve(rel);\r\n};\r\n\r\n\r\n/**\r\n * Removes dot segments in given path component, as described in\r\n * RFC 3986, section 5.2.4.\r\n *\r\n * @param {string} path A non-empty path component.\r\n * @return {string} Path component with removed dot segments.\r\n */\r\ngoog.Uri.removeDotSegments = function(path) {\r\n  if (path == '..' || path == '.') {\r\n    return '';\r\n\r\n  } else if (\r\n      !goog.string.contains(path, './') && !goog.string.contains(path, '/.')) {\r\n    // This optimization detects uris which do not contain dot-segments,\r\n    // and as a consequence do not require any processing.\r\n    return path;\r\n\r\n  } else {\r\n    var leadingSlash = goog.string.startsWith(path, '/');\r\n    var segments = path.split('/');\r\n    var out = [];\r\n\r\n    for (var pos = 0; pos < segments.length;) {\r\n      var segment = segments[pos++];\r\n\r\n      if (segment == '.') {\r\n        if (leadingSlash && pos == segments.length) {\r\n          out.push('');\r\n        }\r\n      } else if (segment == '..') {\r\n        if (out.length > 1 || out.length == 1 && out[0] != '') {\r\n          out.pop();\r\n        }\r\n        if (leadingSlash && pos == segments.length) {\r\n          out.push('');\r\n        }\r\n      } else {\r\n        out.push(segment);\r\n        leadingSlash = true;\r\n      }\r\n    }\r\n\r\n    return out.join('/');\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Decodes a value or returns the empty string if it isn't defined or empty.\r\n * @throws URIError If decodeURIComponent fails to decode val.\r\n * @param {string|undefined} val Value to decode.\r\n * @param {boolean=} opt_preserveReserved If true, restricted characters will\r\n *     not be decoded.\r\n * @return {string} Decoded value.\r\n * @private\r\n */\r\ngoog.Uri.decodeOrEmpty_ = function(val, opt_preserveReserved) {\r\n  // Don't use UrlDecode() here because val is not a query parameter.\r\n  if (!val) {\r\n    return '';\r\n  }\r\n\r\n  // decodeURI has the same output for '%2f' and '%252f'. We double encode %25\r\n  // so that we can distinguish between the 2 inputs. This is later undone by\r\n  // removeDoubleEncoding_.\r\n  return opt_preserveReserved ? decodeURI(val.replace(/%25/g, '%2525')) :\r\n                                decodeURIComponent(val);\r\n};\r\n\r\n\r\n/**\r\n * If unescapedPart is non null, then escapes any characters in it that aren't\r\n * valid characters in a url and also escapes any special characters that\r\n * appear in extra.\r\n *\r\n * @param {*} unescapedPart The string to encode.\r\n * @param {RegExp} extra A character set of characters in [\\01-\\177].\r\n * @param {boolean=} opt_removeDoubleEncoding If true, remove double percent\r\n *     encoding.\r\n * @return {?string} null iff unescapedPart == null.\r\n * @private\r\n */\r\ngoog.Uri.encodeSpecialChars_ = function(\r\n    unescapedPart, extra, opt_removeDoubleEncoding) {\r\n  if (goog.isString(unescapedPart)) {\r\n    var encoded = encodeURI(unescapedPart).replace(extra, goog.Uri.encodeChar_);\r\n    if (opt_removeDoubleEncoding) {\r\n      // encodeURI double-escapes %XX sequences used to represent restricted\r\n      // characters in some URI components, remove the double escaping here.\r\n      encoded = goog.Uri.removeDoubleEncoding_(encoded);\r\n    }\r\n    return encoded;\r\n  }\r\n  return null;\r\n};\r\n\r\n\r\n/**\r\n * Converts a character in [\\01-\\177] to its unicode character equivalent.\r\n * @param {string} ch One character string.\r\n * @return {string} Encoded string.\r\n * @private\r\n */\r\ngoog.Uri.encodeChar_ = function(ch) {\r\n  var n = ch.charCodeAt(0);\r\n  return '%' + ((n >> 4) & 0xf).toString(16) + (n & 0xf).toString(16);\r\n};\r\n\r\n\r\n/**\r\n * Removes double percent-encoding from a string.\r\n * @param  {string} doubleEncodedString String\r\n * @return {string} String with double encoding removed.\r\n * @private\r\n */\r\ngoog.Uri.removeDoubleEncoding_ = function(doubleEncodedString) {\r\n  return doubleEncodedString.replace(/%25([0-9a-fA-F]{2})/g, '%$1');\r\n};\r\n\r\n\r\n/**\r\n * Regular expression for characters that are disallowed in the scheme or\r\n * userInfo part of the URI.\r\n * @type {RegExp}\r\n * @private\r\n */\r\ngoog.Uri.reDisallowedInSchemeOrUserInfo_ = /[#\\/\\?@]/g;\r\n\r\n\r\n/**\r\n * Regular expression for characters that are disallowed in a relative path.\r\n * Colon is included due to RFC 3986 3.3.\r\n * @type {RegExp}\r\n * @private\r\n */\r\ngoog.Uri.reDisallowedInRelativePath_ = /[\\#\\?:]/g;\r\n\r\n\r\n/**\r\n * Regular expression for characters that are disallowed in an absolute path.\r\n * @type {RegExp}\r\n * @private\r\n */\r\ngoog.Uri.reDisallowedInAbsolutePath_ = /[\\#\\?]/g;\r\n\r\n\r\n/**\r\n * Regular expression for characters that are disallowed in the query.\r\n * @type {RegExp}\r\n * @private\r\n */\r\ngoog.Uri.reDisallowedInQuery_ = /[\\#\\?@]/g;\r\n\r\n\r\n/**\r\n * Regular expression for characters that are disallowed in the fragment.\r\n * @type {RegExp}\r\n * @private\r\n */\r\ngoog.Uri.reDisallowedInFragment_ = /#/g;\r\n\r\n\r\n/**\r\n * Checks whether two URIs have the same domain.\r\n * @param {string} uri1String First URI string.\r\n * @param {string} uri2String Second URI string.\r\n * @return {boolean} true if the two URIs have the same domain; false otherwise.\r\n */\r\ngoog.Uri.haveSameDomain = function(uri1String, uri2String) {\r\n  // Differs from goog.uri.utils.haveSameDomain, since this ignores scheme.\r\n  // TODO(gboyer): Have this just call goog.uri.util.haveSameDomain.\r\n  var pieces1 = goog.uri.utils.split(uri1String);\r\n  var pieces2 = goog.uri.utils.split(uri2String);\r\n  return pieces1[goog.uri.utils.ComponentIndex.DOMAIN] ==\r\n      pieces2[goog.uri.utils.ComponentIndex.DOMAIN] &&\r\n      pieces1[goog.uri.utils.ComponentIndex.PORT] ==\r\n      pieces2[goog.uri.utils.ComponentIndex.PORT];\r\n};\r\n\r\n\r\n\r\n/**\r\n * Class used to represent URI query parameters.  It is essentially a hash of\r\n * name-value pairs, though a name can be present more than once.\r\n *\r\n * Has the same interface as the collections in goog.structs.\r\n *\r\n * @param {?string=} opt_query Optional encoded query string to parse into\r\n *     the object.\r\n * @param {goog.Uri=} opt_uri Optional uri object that should have its\r\n *     cache invalidated when this object updates. Deprecated -- this\r\n *     is no longer required.\r\n * @param {boolean=} opt_ignoreCase If true, ignore the case of the parameter\r\n *     name in #get.\r\n * @constructor\r\n * @struct\r\n * @final\r\n */\r\ngoog.Uri.QueryData = function(opt_query, opt_uri, opt_ignoreCase) {\r\n  /**\r\n   * The map containing name/value or name/array-of-values pairs.\r\n   * May be null if it requires parsing from the query string.\r\n   *\r\n   * We need to use a Map because we cannot guarantee that the key names will\r\n   * not be problematic for IE.\r\n   *\r\n   * @private {?goog.structs.Map<string, !Array<*>>}\r\n   */\r\n  this.keyMap_ = null;\r\n\r\n  /**\r\n   * The number of params, or null if it requires computing.\r\n   * @private {?number}\r\n   */\r\n  this.count_ = null;\r\n\r\n  /**\r\n   * Encoded query string, or null if it requires computing from the key map.\r\n   * @private {?string}\r\n   */\r\n  this.encodedQuery_ = opt_query || null;\r\n\r\n  /**\r\n   * If true, ignore the case of the parameter name in #get.\r\n   * @private {boolean}\r\n   */\r\n  this.ignoreCase_ = !!opt_ignoreCase;\r\n};\r\n\r\n\r\n/**\r\n * If the underlying key map is not yet initialized, it parses the\r\n * query string and fills the map with parsed data.\r\n * @private\r\n */\r\ngoog.Uri.QueryData.prototype.ensureKeyMapInitialized_ = function() {\r\n  if (!this.keyMap_) {\r\n    this.keyMap_ = new goog.structs.Map();\r\n    this.count_ = 0;\r\n    if (this.encodedQuery_) {\r\n      var self = this;\r\n      goog.uri.utils.parseQueryData(this.encodedQuery_, function(name, value) {\r\n        self.add(goog.string.urlDecode(name), value);\r\n      });\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Creates a new query data instance from a map of names and values.\r\n *\r\n * @param {!goog.structs.Map<string, ?>|!Object} map Map of string parameter\r\n *     names to parameter value. If parameter value is an array, it is\r\n *     treated as if the key maps to each individual value in the\r\n *     array.\r\n * @param {goog.Uri=} opt_uri URI object that should have its cache\r\n *     invalidated when this object updates.\r\n * @param {boolean=} opt_ignoreCase If true, ignore the case of the parameter\r\n *     name in #get.\r\n * @return {!goog.Uri.QueryData} The populated query data instance.\r\n */\r\ngoog.Uri.QueryData.createFromMap = function(map, opt_uri, opt_ignoreCase) {\r\n  var keys = goog.structs.getKeys(map);\r\n  if (typeof keys == 'undefined') {\r\n    throw new Error('Keys are undefined');\r\n  }\r\n\r\n  var queryData = new goog.Uri.QueryData(null, null, opt_ignoreCase);\r\n  var values = goog.structs.getValues(map);\r\n  for (var i = 0; i < keys.length; i++) {\r\n    var key = keys[i];\r\n    var value = values[i];\r\n    if (!goog.isArray(value)) {\r\n      queryData.add(key, value);\r\n    } else {\r\n      queryData.setValues(key, value);\r\n    }\r\n  }\r\n  return queryData;\r\n};\r\n\r\n\r\n/**\r\n * Creates a new query data instance from parallel arrays of parameter names\r\n * and values. Allows for duplicate parameter names. Throws an error if the\r\n * lengths of the arrays differ.\r\n *\r\n * @param {!Array<string>} keys Parameter names.\r\n * @param {!Array<?>} values Parameter values.\r\n * @param {goog.Uri=} opt_uri URI object that should have its cache\r\n *     invalidated when this object updates.\r\n * @param {boolean=} opt_ignoreCase If true, ignore the case of the parameter\r\n *     name in #get.\r\n * @return {!goog.Uri.QueryData} The populated query data instance.\r\n */\r\ngoog.Uri.QueryData.createFromKeysValues = function(\r\n    keys, values, opt_uri, opt_ignoreCase) {\r\n  if (keys.length != values.length) {\r\n    throw new Error('Mismatched lengths for keys/values');\r\n  }\r\n  var queryData = new goog.Uri.QueryData(null, null, opt_ignoreCase);\r\n  for (var i = 0; i < keys.length; i++) {\r\n    queryData.add(keys[i], values[i]);\r\n  }\r\n  return queryData;\r\n};\r\n\r\n\r\n/**\r\n * @return {?number} The number of parameters.\r\n */\r\ngoog.Uri.QueryData.prototype.getCount = function() {\r\n  this.ensureKeyMapInitialized_();\r\n  return this.count_;\r\n};\r\n\r\n\r\n/**\r\n * Adds a key value pair.\r\n * @param {string} key Name.\r\n * @param {*} value Value.\r\n * @return {!goog.Uri.QueryData} Instance of this object.\r\n */\r\ngoog.Uri.QueryData.prototype.add = function(key, value) {\r\n  this.ensureKeyMapInitialized_();\r\n  this.invalidateCache_();\r\n\r\n  key = this.getKeyName_(key);\r\n  var values = this.keyMap_.get(key);\r\n  if (!values) {\r\n    this.keyMap_.set(key, (values = []));\r\n  }\r\n  values.push(value);\r\n  this.count_ = goog.asserts.assertNumber(this.count_) + 1;\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * Removes all the params with the given key.\r\n * @param {string} key Name.\r\n * @return {boolean} Whether any parameter was removed.\r\n */\r\ngoog.Uri.QueryData.prototype.remove = function(key) {\r\n  this.ensureKeyMapInitialized_();\r\n\r\n  key = this.getKeyName_(key);\r\n  if (this.keyMap_.containsKey(key)) {\r\n    this.invalidateCache_();\r\n\r\n    // Decrement parameter count.\r\n    this.count_ =\r\n        goog.asserts.assertNumber(this.count_) - this.keyMap_.get(key).length;\r\n    return this.keyMap_.remove(key);\r\n  }\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Clears the parameters.\r\n */\r\ngoog.Uri.QueryData.prototype.clear = function() {\r\n  this.invalidateCache_();\r\n  this.keyMap_ = null;\r\n  this.count_ = 0;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether we have any parameters.\r\n */\r\ngoog.Uri.QueryData.prototype.isEmpty = function() {\r\n  this.ensureKeyMapInitialized_();\r\n  return this.count_ == 0;\r\n};\r\n\r\n\r\n/**\r\n * Whether there is a parameter with the given name\r\n * @param {string} key The parameter name to check for.\r\n * @return {boolean} Whether there is a parameter with the given name.\r\n */\r\ngoog.Uri.QueryData.prototype.containsKey = function(key) {\r\n  this.ensureKeyMapInitialized_();\r\n  key = this.getKeyName_(key);\r\n  return this.keyMap_.containsKey(key);\r\n};\r\n\r\n\r\n/**\r\n * Whether there is a parameter with the given value.\r\n * @param {*} value The value to check for.\r\n * @return {boolean} Whether there is a parameter with the given value.\r\n */\r\ngoog.Uri.QueryData.prototype.containsValue = function(value) {\r\n  // NOTE(arv): This solution goes through all the params even if it was the\r\n  // first param. We can get around this by not reusing code or by switching to\r\n  // iterators.\r\n  var vals = this.getValues();\r\n  return goog.array.contains(vals, value);\r\n};\r\n\r\n\r\n/**\r\n * Runs a callback on every key-value pair in the map, including duplicate keys.\r\n * This won't maintain original order when duplicate keys are interspersed (like\r\n * getKeys() / getValues()).\r\n * @param {function(this:SCOPE, ?, string, !goog.Uri.QueryData)} f\r\n * @param {SCOPE=} opt_scope The value of \"this\" inside f.\r\n * @template SCOPE\r\n */\r\ngoog.Uri.QueryData.prototype.forEach = function(f, opt_scope) {\r\n  this.ensureKeyMapInitialized_();\r\n  this.keyMap_.forEach(function(values, key) {\r\n    goog.array.forEach(values, function(value) {\r\n      f.call(opt_scope, value, key, this);\r\n    }, this);\r\n  }, this);\r\n};\r\n\r\n\r\n/**\r\n * Returns all the keys of the parameters. If a key is used multiple times\r\n * it will be included multiple times in the returned array\r\n * @return {!Array<string>} All the keys of the parameters.\r\n */\r\ngoog.Uri.QueryData.prototype.getKeys = function() {\r\n  this.ensureKeyMapInitialized_();\r\n  // We need to get the values to know how many keys to add.\r\n  var vals = this.keyMap_.getValues();\r\n  var keys = this.keyMap_.getKeys();\r\n  var rv = [];\r\n  for (var i = 0; i < keys.length; i++) {\r\n    var val = vals[i];\r\n    for (var j = 0; j < val.length; j++) {\r\n      rv.push(keys[i]);\r\n    }\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Returns all the values of the parameters with the given name. If the query\r\n * data has no such key this will return an empty array. If no key is given\r\n * all values wil be returned.\r\n * @param {string=} opt_key The name of the parameter to get the values for.\r\n * @return {!Array<?>} All the values of the parameters with the given name.\r\n */\r\ngoog.Uri.QueryData.prototype.getValues = function(opt_key) {\r\n  this.ensureKeyMapInitialized_();\r\n  var rv = [];\r\n  if (goog.isString(opt_key)) {\r\n    if (this.containsKey(opt_key)) {\r\n      rv = goog.array.concat(rv, this.keyMap_.get(this.getKeyName_(opt_key)));\r\n    }\r\n  } else {\r\n    // Return all values.\r\n    var values = this.keyMap_.getValues();\r\n    for (var i = 0; i < values.length; i++) {\r\n      rv = goog.array.concat(rv, values[i]);\r\n    }\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Sets a key value pair and removes all other keys with the same value.\r\n *\r\n * @param {string} key Name.\r\n * @param {*} value Value.\r\n * @return {!goog.Uri.QueryData} Instance of this object.\r\n */\r\ngoog.Uri.QueryData.prototype.set = function(key, value) {\r\n  this.ensureKeyMapInitialized_();\r\n  this.invalidateCache_();\r\n\r\n  // TODO(chrishenry): This could be better written as\r\n  // this.remove(key), this.add(key, value), but that would reorder\r\n  // the key (since the key is first removed and then added at the\r\n  // end) and we would have to fix unit tests that depend on key\r\n  // ordering.\r\n  key = this.getKeyName_(key);\r\n  if (this.containsKey(key)) {\r\n    this.count_ =\r\n        goog.asserts.assertNumber(this.count_) - this.keyMap_.get(key).length;\r\n  }\r\n  this.keyMap_.set(key, [value]);\r\n  this.count_ = goog.asserts.assertNumber(this.count_) + 1;\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * Returns the first value associated with the key. If the query data has no\r\n * such key this will return undefined or the optional default.\r\n * @param {string} key The name of the parameter to get the value for.\r\n * @param {*=} opt_default The default value to return if the query data\r\n *     has no such key.\r\n * @return {*} The first string value associated with the key, or opt_default\r\n *     if there's no value.\r\n */\r\ngoog.Uri.QueryData.prototype.get = function(key, opt_default) {\r\n  if (!key) {\r\n    return opt_default;\r\n  }\r\n  var values = this.getValues(key);\r\n  return values.length > 0 ? String(values[0]) : opt_default;\r\n};\r\n\r\n\r\n/**\r\n * Sets the values for a key. If the key already exists, this will\r\n * override all of the existing values that correspond to the key.\r\n * @param {string} key The key to set values for.\r\n * @param {!Array<?>} values The values to set.\r\n */\r\ngoog.Uri.QueryData.prototype.setValues = function(key, values) {\r\n  this.remove(key);\r\n\r\n  if (values.length > 0) {\r\n    this.invalidateCache_();\r\n    this.keyMap_.set(this.getKeyName_(key), goog.array.clone(values));\r\n    this.count_ = goog.asserts.assertNumber(this.count_) + values.length;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {string} Encoded query string.\r\n * @override\r\n */\r\ngoog.Uri.QueryData.prototype.toString = function() {\r\n  if (this.encodedQuery_) {\r\n    return this.encodedQuery_;\r\n  }\r\n\r\n  if (!this.keyMap_) {\r\n    return '';\r\n  }\r\n\r\n  var sb = [];\r\n\r\n  // In the past, we use this.getKeys() and this.getVals(), but that\r\n  // generates a lot of allocations as compared to simply iterating\r\n  // over the keys.\r\n  var keys = this.keyMap_.getKeys();\r\n  for (var i = 0; i < keys.length; i++) {\r\n    var key = keys[i];\r\n    var encodedKey = goog.string.urlEncode(key);\r\n    var val = this.getValues(key);\r\n    for (var j = 0; j < val.length; j++) {\r\n      var param = encodedKey;\r\n      // Ensure that null and undefined are encoded into the url as\r\n      // literal strings.\r\n      if (val[j] !== '') {\r\n        param += '=' + goog.string.urlEncode(val[j]);\r\n      }\r\n      sb.push(param);\r\n    }\r\n  }\r\n\r\n  return this.encodedQuery_ = sb.join('&');\r\n};\r\n\r\n\r\n/**\r\n * @throws URIError If URI is malformed (that is, if decodeURIComponent fails on\r\n *     any of the URI components).\r\n * @return {string} Decoded query string.\r\n */\r\ngoog.Uri.QueryData.prototype.toDecodedString = function() {\r\n  return goog.Uri.decodeOrEmpty_(this.toString());\r\n};\r\n\r\n\r\n/**\r\n * Invalidate the cache.\r\n * @private\r\n */\r\ngoog.Uri.QueryData.prototype.invalidateCache_ = function() {\r\n  this.encodedQuery_ = null;\r\n};\r\n\r\n\r\n/**\r\n * Removes all keys that are not in the provided list. (Modifies this object.)\r\n * @param {Array<string>} keys The desired keys.\r\n * @return {!goog.Uri.QueryData} a reference to this object.\r\n */\r\ngoog.Uri.QueryData.prototype.filterKeys = function(keys) {\r\n  this.ensureKeyMapInitialized_();\r\n  this.keyMap_.forEach(function(value, key) {\r\n    if (!goog.array.contains(keys, key)) {\r\n      this.remove(key);\r\n    }\r\n  }, this);\r\n  return this;\r\n};\r\n\r\n\r\n/**\r\n * Clone the query data instance.\r\n * @return {!goog.Uri.QueryData} New instance of the QueryData object.\r\n */\r\ngoog.Uri.QueryData.prototype.clone = function() {\r\n  var rv = new goog.Uri.QueryData();\r\n  rv.encodedQuery_ = this.encodedQuery_;\r\n  if (this.keyMap_) {\r\n    rv.keyMap_ = this.keyMap_.clone();\r\n    rv.count_ = this.count_;\r\n  }\r\n  return rv;\r\n};\r\n\r\n\r\n/**\r\n * Helper function to get the key name from a JavaScript object. Converts\r\n * the object to a string, and to lower case if necessary.\r\n * @private\r\n * @param {*} arg The object to get a key name from.\r\n * @return {string} valid key name which can be looked up in #keyMap_.\r\n */\r\ngoog.Uri.QueryData.prototype.getKeyName_ = function(arg) {\r\n  var keyName = String(arg);\r\n  if (this.ignoreCase_) {\r\n    keyName = keyName.toLowerCase();\r\n  }\r\n  return keyName;\r\n};\r\n\r\n\r\n/**\r\n * Ignore case in parameter names.\r\n * NOTE: If there are already key/value pairs in the QueryData, and\r\n * ignoreCase_ is set to false, the keys will all be lower-cased.\r\n * @param {boolean} ignoreCase whether this goog.Uri should ignore case.\r\n */\r\ngoog.Uri.QueryData.prototype.setIgnoreCase = function(ignoreCase) {\r\n  var resetKeys = ignoreCase && !this.ignoreCase_;\r\n  if (resetKeys) {\r\n    this.ensureKeyMapInitialized_();\r\n    this.invalidateCache_();\r\n    this.keyMap_.forEach(function(value, key) {\r\n      var lowerCase = key.toLowerCase();\r\n      if (key != lowerCase) {\r\n        this.remove(key);\r\n        this.setValues(lowerCase, value);\r\n      }\r\n    }, this);\r\n  }\r\n  this.ignoreCase_ = ignoreCase;\r\n};\r\n\r\n\r\n/**\r\n * Extends a query data object with another query data or map like object. This\r\n * operates 'in-place', it does not create a new QueryData object.\r\n *\r\n * @param {...(?goog.Uri.QueryData|?goog.structs.Map<?, ?>|?Object)} var_args\r\n *     The object from which key value pairs will be copied. Note: does not\r\n *     accept null.\r\n * @suppress {deprecated} Use deprecated goog.structs.forEach to allow different\r\n * types of parameters.\r\n */\r\ngoog.Uri.QueryData.prototype.extend = function(var_args) {\r\n  for (var i = 0; i < arguments.length; i++) {\r\n    var data = arguments[i];\r\n    goog.structs.forEach(\r\n        data, function(value, key) { this.add(key, value); }, this);\r\n  }\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Definition of various formatters for logging. Please minimize\r\n * dependencies this file has on other closure classes as any dependency it\r\n * takes won't be able to use the logging infrastructure.\r\n *\r\n */\r\n\r\ngoog.provide('goog.debug.Formatter');\r\ngoog.provide('goog.debug.HtmlFormatter');\r\ngoog.provide('goog.debug.TextFormatter');\r\n\r\ngoog.require('goog.debug');\r\ngoog.require('goog.debug.Logger');\r\ngoog.require('goog.debug.RelativeTimeProvider');\r\ngoog.require('goog.html.SafeHtml');\r\ngoog.require('goog.html.SafeUrl');\r\ngoog.require('goog.html.uncheckedconversions');\r\ngoog.require('goog.string.Const');\r\n\r\n\r\n\r\n/**\r\n * Base class for Formatters. A Formatter is used to format a LogRecord into\r\n * something that can be displayed to the user.\r\n *\r\n * @param {string=} opt_prefix The prefix to place before text records.\r\n * @constructor\r\n */\r\ngoog.debug.Formatter = function(opt_prefix) {\r\n  this.prefix_ = opt_prefix || '';\r\n\r\n  /**\r\n   * A provider that returns the relative start time.\r\n   * @type {goog.debug.RelativeTimeProvider}\r\n   * @private\r\n   */\r\n  this.startTimeProvider_ =\r\n      goog.debug.RelativeTimeProvider.getDefaultInstance();\r\n};\r\n\r\n\r\n/**\r\n * Whether to append newlines to the end of formatted log records.\r\n * @type {boolean}\r\n */\r\ngoog.debug.Formatter.prototype.appendNewline = true;\r\n\r\n\r\n/**\r\n * Whether to show absolute time in the DebugWindow.\r\n * @type {boolean}\r\n */\r\ngoog.debug.Formatter.prototype.showAbsoluteTime = true;\r\n\r\n\r\n/**\r\n * Whether to show relative time in the DebugWindow.\r\n * @type {boolean}\r\n */\r\ngoog.debug.Formatter.prototype.showRelativeTime = true;\r\n\r\n\r\n/**\r\n * Whether to show the logger name in the DebugWindow.\r\n * @type {boolean}\r\n */\r\ngoog.debug.Formatter.prototype.showLoggerName = true;\r\n\r\n\r\n/**\r\n * Whether to show the logger exception text.\r\n * @type {boolean}\r\n */\r\ngoog.debug.Formatter.prototype.showExceptionText = false;\r\n\r\n\r\n/**\r\n * Whether to show the severity level.\r\n * @type {boolean}\r\n */\r\ngoog.debug.Formatter.prototype.showSeverityLevel = false;\r\n\r\n\r\n/**\r\n * Formats a record.\r\n * @param {goog.debug.LogRecord} logRecord the logRecord to format.\r\n * @return {string} The formatted string.\r\n */\r\ngoog.debug.Formatter.prototype.formatRecord = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * Formats a record as SafeHtml.\r\n * @param {goog.debug.LogRecord} logRecord the logRecord to format.\r\n * @return {!goog.html.SafeHtml} The formatted string as SafeHtml.\r\n */\r\ngoog.debug.Formatter.prototype.formatRecordAsHtml = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * Sets the start time provider. By default, this is the default instance\r\n * but can be changed.\r\n * @param {goog.debug.RelativeTimeProvider} provider The provider to use.\r\n */\r\ngoog.debug.Formatter.prototype.setStartTimeProvider = function(provider) {\r\n  this.startTimeProvider_ = provider;\r\n};\r\n\r\n\r\n/**\r\n * Returns the start time provider. By default, this is the default instance\r\n * but can be changed.\r\n * @return {goog.debug.RelativeTimeProvider} The start time provider.\r\n */\r\ngoog.debug.Formatter.prototype.getStartTimeProvider = function() {\r\n  return this.startTimeProvider_;\r\n};\r\n\r\n\r\n/**\r\n * Resets the start relative time.\r\n */\r\ngoog.debug.Formatter.prototype.resetRelativeTimeStart = function() {\r\n  this.startTimeProvider_.reset();\r\n};\r\n\r\n\r\n/**\r\n * Returns a string for the time/date of the LogRecord.\r\n * @param {goog.debug.LogRecord} logRecord The record to get a time stamp for.\r\n * @return {string} A string representation of the time/date of the LogRecord.\r\n * @private\r\n */\r\ngoog.debug.Formatter.getDateTimeStamp_ = function(logRecord) {\r\n  var time = new Date(logRecord.getMillis());\r\n  return goog.debug.Formatter.getTwoDigitString_((time.getFullYear() - 2000)) +\r\n      goog.debug.Formatter.getTwoDigitString_((time.getMonth() + 1)) +\r\n      goog.debug.Formatter.getTwoDigitString_(time.getDate()) + ' ' +\r\n      goog.debug.Formatter.getTwoDigitString_(time.getHours()) + ':' +\r\n      goog.debug.Formatter.getTwoDigitString_(time.getMinutes()) + ':' +\r\n      goog.debug.Formatter.getTwoDigitString_(time.getSeconds()) + '.' +\r\n      goog.debug.Formatter.getTwoDigitString_(\r\n          Math.floor(time.getMilliseconds() / 10));\r\n};\r\n\r\n\r\n/**\r\n * Returns the number as a two-digit string, meaning it prepends a 0 if the\r\n * number if less than 10.\r\n * @param {number} n The number to format.\r\n * @return {string} A two-digit string representation of `n`.\r\n * @private\r\n */\r\ngoog.debug.Formatter.getTwoDigitString_ = function(n) {\r\n  if (n < 10) {\r\n    return '0' + n;\r\n  }\r\n  return String(n);\r\n};\r\n\r\n\r\n/**\r\n * Returns a string for the number of seconds relative to the start time.\r\n * Prepads with spaces so that anything less than 1000 seconds takes up the\r\n * same number of characters for better formatting.\r\n * @param {goog.debug.LogRecord} logRecord The log to compare time to.\r\n * @param {number} relativeTimeStart The start time to compare to.\r\n * @return {string} The number of seconds of the LogRecord relative to the\r\n *     start time.\r\n * @private\r\n */\r\ngoog.debug.Formatter.getRelativeTime_ = function(logRecord, relativeTimeStart) {\r\n  var ms = logRecord.getMillis() - relativeTimeStart;\r\n  var sec = ms / 1000;\r\n  var str = sec.toFixed(3);\r\n\r\n  var spacesToPrepend = 0;\r\n  if (sec < 1) {\r\n    spacesToPrepend = 2;\r\n  } else {\r\n    while (sec < 100) {\r\n      spacesToPrepend++;\r\n      sec *= 10;\r\n    }\r\n  }\r\n  while (spacesToPrepend-- > 0) {\r\n    str = ' ' + str;\r\n  }\r\n  return str;\r\n};\r\n\r\n\r\n\r\n/**\r\n * Formatter that returns formatted html. See formatRecord for the classes\r\n * it uses for various types of formatted output.\r\n *\r\n * @param {string=} opt_prefix The prefix to place before text records.\r\n * @constructor\r\n * @extends {goog.debug.Formatter}\r\n */\r\ngoog.debug.HtmlFormatter = function(opt_prefix) {\r\n  goog.debug.Formatter.call(this, opt_prefix);\r\n};\r\ngoog.inherits(goog.debug.HtmlFormatter, goog.debug.Formatter);\r\n\r\n\r\n/**\r\n * Exposes an exception that has been caught by a try...catch and outputs the\r\n * error as HTML with a stack trace.\r\n *\r\n * @param {*} err Error object or string.\r\n * @param {?Function=} fn If provided, when collecting the stack trace all\r\n *     frames above the topmost call to this function, including that call,\r\n *     will be left out of the stack trace.\r\n * @return {string} Details of exception, as HTML.\r\n */\r\ngoog.debug.HtmlFormatter.exposeException = function(err, fn) {\r\n  var html = goog.debug.HtmlFormatter.exposeExceptionAsHtml(err, fn);\r\n  return goog.html.SafeHtml.unwrap(html);\r\n};\r\n\r\n\r\n/**\r\n * Exposes an exception that has been caught by a try...catch and outputs the\r\n * error with a stack trace.\r\n *\r\n * @param {*} err Error object or string.\r\n * @param {?Function=} fn If provided, when collecting the stack trace all\r\n *     frames above the topmost call to this function, including that call,\r\n *     will be left out of the stack trace.\r\n * @return {!goog.html.SafeHtml} Details of exception.\r\n */\r\ngoog.debug.HtmlFormatter.exposeExceptionAsHtml = function(err, fn) {\r\n  try {\r\n    var e = goog.debug.normalizeErrorObject(err);\r\n    // Create the error message\r\n    var viewSourceUrl =\r\n        goog.debug.HtmlFormatter.createViewSourceUrl_(e.fileName);\r\n    var error = goog.html.SafeHtml.concat(\r\n        goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(\r\n            'Message: ' + e.message + '\\nUrl: '),\r\n        goog.html.SafeHtml.create(\r\n            'a', {href: viewSourceUrl, target: '_new'}, e.fileName),\r\n        goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(\r\n            '\\nLine: ' + e.lineNumber + '\\n\\nBrowser stack:\\n' + e.stack +\r\n            '-> ' +\r\n            '[end]\\n\\nJS stack traversal:\\n' + goog.debug.getStacktrace(fn) +\r\n            '-> '));\r\n    return error;\r\n  } catch (e2) {\r\n    return goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(\r\n        'Exception trying to expose exception! You win, we lose. ' + e2);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @param {?string=} fileName\r\n * @return {!goog.html.SafeUrl} SafeUrl with view-source scheme, pointing at\r\n *     fileName.\r\n * @private\r\n */\r\ngoog.debug.HtmlFormatter.createViewSourceUrl_ = function(fileName) {\r\n  if (!goog.isDefAndNotNull(fileName)) {\r\n    fileName = '';\r\n  }\r\n  if (!/^https?:\\/\\//i.test(fileName)) {\r\n    return goog.html.SafeUrl.fromConstant(\r\n        goog.string.Const.from('sanitizedviewsrc'));\r\n  }\r\n  var sanitizedFileName = goog.html.SafeUrl.sanitize(fileName);\r\n  return goog.html.uncheckedconversions\r\n      .safeUrlFromStringKnownToSatisfyTypeContract(\r\n          goog.string.Const.from('view-source scheme plus HTTP/HTTPS URL'),\r\n          'view-source:' + goog.html.SafeUrl.unwrap(sanitizedFileName));\r\n};\r\n\r\n\r\n\r\n/**\r\n * Whether to show the logger exception text\r\n * @type {boolean}\r\n * @override\r\n */\r\ngoog.debug.HtmlFormatter.prototype.showExceptionText = true;\r\n\r\n\r\n/**\r\n * Formats a record\r\n * @param {goog.debug.LogRecord} logRecord the logRecord to format.\r\n * @return {string} The formatted string as html.\r\n * @override\r\n */\r\ngoog.debug.HtmlFormatter.prototype.formatRecord = function(logRecord) {\r\n  if (!logRecord) {\r\n    return '';\r\n  }\r\n  // OK not to use goog.html.SafeHtml.unwrap() here.\r\n  return this.formatRecordAsHtml(logRecord).getTypedStringValue();\r\n};\r\n\r\n\r\n/**\r\n * Formats a record.\r\n * @param {goog.debug.LogRecord} logRecord the logRecord to format.\r\n * @return {!goog.html.SafeHtml} The formatted string as SafeHtml.\r\n * @override\r\n */\r\ngoog.debug.HtmlFormatter.prototype.formatRecordAsHtml = function(logRecord) {\r\n  if (!logRecord) {\r\n    return goog.html.SafeHtml.EMPTY;\r\n  }\r\n\r\n  var className;\r\n  switch (logRecord.getLevel().value) {\r\n    case goog.debug.Logger.Level.SHOUT.value:\r\n      className = 'dbg-sh';\r\n      break;\r\n    case goog.debug.Logger.Level.SEVERE.value:\r\n      className = 'dbg-sev';\r\n      break;\r\n    case goog.debug.Logger.Level.WARNING.value:\r\n      className = 'dbg-w';\r\n      break;\r\n    case goog.debug.Logger.Level.INFO.value:\r\n      className = 'dbg-i';\r\n      break;\r\n    case goog.debug.Logger.Level.FINE.value:\r\n    default:\r\n      className = 'dbg-f';\r\n      break;\r\n  }\r\n\r\n  // HTML for user defined prefix, time, logger name, and severity.\r\n  var sb = [];\r\n  sb.push(this.prefix_, ' ');\r\n  if (this.showAbsoluteTime) {\r\n    sb.push('[', goog.debug.Formatter.getDateTimeStamp_(logRecord), '] ');\r\n  }\r\n  if (this.showRelativeTime) {\r\n    sb.push(\r\n        '[', goog.debug.Formatter.getRelativeTime_(\r\n                 logRecord, this.startTimeProvider_.get()),\r\n        's] ');\r\n  }\r\n  if (this.showLoggerName) {\r\n    sb.push('[', logRecord.getLoggerName(), '] ');\r\n  }\r\n  if (this.showSeverityLevel) {\r\n    sb.push('[', logRecord.getLevel().name, '] ');\r\n  }\r\n  var fullPrefixHtml =\r\n      goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(sb.join(''));\r\n\r\n  // HTML for exception text and log record.\r\n  var exceptionHtml = goog.html.SafeHtml.EMPTY;\r\n  if (this.showExceptionText && logRecord.getException()) {\r\n    exceptionHtml = goog.html.SafeHtml.concat(\r\n        goog.html.SafeHtml.BR,\r\n        goog.debug.HtmlFormatter.exposeExceptionAsHtml(\r\n            logRecord.getException()));\r\n  }\r\n  var logRecordHtml = goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(\r\n      logRecord.getMessage());\r\n  var recordAndExceptionHtml = goog.html.SafeHtml.create(\r\n      'span', {'class': className},\r\n      goog.html.SafeHtml.concat(logRecordHtml, exceptionHtml));\r\n\r\n\r\n  // Combine both pieces of HTML and, if needed, append a final newline.\r\n  var html;\r\n  if (this.appendNewline) {\r\n    html = goog.html.SafeHtml.concat(\r\n        fullPrefixHtml, recordAndExceptionHtml, goog.html.SafeHtml.BR);\r\n  } else {\r\n    html = goog.html.SafeHtml.concat(fullPrefixHtml, recordAndExceptionHtml);\r\n  }\r\n  return html;\r\n};\r\n\r\n\r\n\r\n/**\r\n * Formatter that returns formatted plain text\r\n *\r\n * @param {string=} opt_prefix The prefix to place before text records.\r\n * @constructor\r\n * @extends {goog.debug.Formatter}\r\n * @final\r\n */\r\ngoog.debug.TextFormatter = function(opt_prefix) {\r\n  goog.debug.Formatter.call(this, opt_prefix);\r\n};\r\ngoog.inherits(goog.debug.TextFormatter, goog.debug.Formatter);\r\n\r\n\r\n/**\r\n * Formats a record as text\r\n * @param {goog.debug.LogRecord} logRecord the logRecord to format.\r\n * @return {string} The formatted string.\r\n * @override\r\n */\r\ngoog.debug.TextFormatter.prototype.formatRecord = function(logRecord) {\r\n  var sb = [];\r\n  sb.push(this.prefix_, ' ');\r\n  if (this.showAbsoluteTime) {\r\n    sb.push('[', goog.debug.Formatter.getDateTimeStamp_(logRecord), '] ');\r\n  }\r\n  if (this.showRelativeTime) {\r\n    sb.push(\r\n        '[', goog.debug.Formatter.getRelativeTime_(\r\n                 logRecord, this.startTimeProvider_.get()),\r\n        's] ');\r\n  }\r\n\r\n  if (this.showLoggerName) {\r\n    sb.push('[', logRecord.getLoggerName(), '] ');\r\n  }\r\n  if (this.showSeverityLevel) {\r\n    sb.push('[', logRecord.getLevel().name, '] ');\r\n  }\r\n  sb.push(logRecord.getMessage());\r\n  if (this.showExceptionText) {\r\n    var exception = logRecord.getException();\r\n    if (exception) {\r\n      var exceptionText =\r\n          exception instanceof Error ? exception.message : exception.toString();\r\n      sb.push('\\n', exceptionText);\r\n    }\r\n  }\r\n  if (this.appendNewline) {\r\n    sb.push('\\n');\r\n  }\r\n  return sb.join('');\r\n};\r\n\r\n\r\n/**\r\n * Formats a record as text\r\n * @param {goog.debug.LogRecord} logRecord the logRecord to format.\r\n * @return {!goog.html.SafeHtml} The formatted string as SafeHtml. This is\r\n *     just an HTML-escaped version of the text obtained from formatRecord().\r\n * @override\r\n */\r\ngoog.debug.TextFormatter.prototype.formatRecordAsHtml = function(logRecord) {\r\n  return goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces(\r\n      goog.debug.TextFormatter.prototype.formatRecord(logRecord));\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Base TestChannel implementation.\r\n *\r\n */\r\n\r\n\r\ngoog.provide('goog.labs.net.webChannel.BaseTestChannel');\r\n\r\ngoog.require('goog.labs.net.webChannel.Channel');\r\ngoog.require('goog.labs.net.webChannel.ChannelRequest');\r\ngoog.require('goog.labs.net.webChannel.WebChannelDebug');\r\ngoog.require('goog.labs.net.webChannel.requestStats');\r\ngoog.require('goog.net.WebChannel');\r\n\r\ngoog.forwardDeclare('goog.labs.net.webChannel.WebChannelBase');\r\n\r\n\r\n\r\n/**\r\n * A TestChannel is used during the first part of channel negotiation\r\n * with the server to create the channel. It helps us determine whether we're\r\n * behind a buffering proxy.\r\n *\r\n * @constructor\r\n * @struct\r\n * @param {!goog.labs.net.webChannel.Channel} channel The channel\r\n *     that owns this test channel.\r\n * @param {!goog.labs.net.webChannel.WebChannelDebug} channelDebug A\r\n *     WebChannelDebug instance to use for logging.\r\n * @implements {goog.labs.net.webChannel.Channel}\r\n */\r\ngoog.labs.net.webChannel.BaseTestChannel = function(channel, channelDebug) {\r\n  /**\r\n   * The channel that owns this test channel\r\n   * @private {!goog.labs.net.webChannel.Channel}\r\n   */\r\n  this.channel_ = channel;\r\n\r\n  /**\r\n   * The channel debug to use for logging\r\n   * @private {!goog.labs.net.webChannel.WebChannelDebug}\r\n   */\r\n  this.channelDebug_ = channelDebug;\r\n\r\n  /**\r\n   * Extra HTTP headers to add to all the requests sent to the server.\r\n   * @private {Object}\r\n   */\r\n  this.extraHeaders_ = null;\r\n\r\n  /**\r\n   * The test request.\r\n   * @private {goog.labs.net.webChannel.ChannelRequest}\r\n   */\r\n  this.request_ = null;\r\n\r\n  /**\r\n   * Whether we have received the first result as an intermediate result. This\r\n   * helps us determine whether we're behind a buffering proxy.\r\n   * @private {boolean}\r\n   */\r\n  this.receivedIntermediateResult_ = false;\r\n\r\n  /**\r\n   * The relative path for test requests.\r\n   * @private {?string}\r\n   */\r\n  this.path_ = null;\r\n\r\n  /**\r\n   * The last status code received.\r\n   * @private {number}\r\n   */\r\n  this.lastStatusCode_ = -1;\r\n\r\n  /**\r\n   * A subdomain prefix for using a subdomain in IE for the backchannel\r\n   * requests.\r\n   * @private {?string}\r\n   */\r\n  this.hostPrefix_ = null;\r\n\r\n  /**\r\n   * The effective client protocol as indicated by the initial handshake\r\n   * response via the x-client-wire-protocol header.\r\n   *\r\n   * @private {?string}\r\n   */\r\n  this.clientProtocol_ = null;\r\n};\r\n\r\n\r\ngoog.scope(function() {\r\nvar WebChannel = goog.net.WebChannel;\r\nvar BaseTestChannel = goog.labs.net.webChannel.BaseTestChannel;\r\nvar WebChannelDebug = goog.labs.net.webChannel.WebChannelDebug;\r\nvar ChannelRequest = goog.labs.net.webChannel.ChannelRequest;\r\nvar requestStats = goog.labs.net.webChannel.requestStats;\r\nvar Channel = goog.labs.net.webChannel.Channel;\r\n\r\n\r\n/**\r\n * Enum type for the test channel state machine\r\n * @enum {number}\r\n * @private\r\n */\r\nBaseTestChannel.State_ = {\r\n  /**\r\n   * The state for the TestChannel state machine where we making the\r\n   * initial call to get the server configured parameters.\r\n   */\r\n  INIT: 0,\r\n\r\n  /**\r\n   * The  state for the TestChannel state machine where we're checking to\r\n   * se if we're behind a buffering proxy.\r\n   */\r\n  CONNECTION_TESTING: 1\r\n};\r\n\r\n\r\n/**\r\n * The state of the state machine for this object.\r\n *\r\n * @private {?BaseTestChannel.State_}\r\n */\r\nBaseTestChannel.prototype.state_ = null;\r\n\r\n\r\n/**\r\n * Sets extra HTTP headers to add to all the requests sent to the server.\r\n *\r\n * @param {Object} extraHeaders The HTTP headers.\r\n */\r\nBaseTestChannel.prototype.setExtraHeaders = function(extraHeaders) {\r\n  this.extraHeaders_ = extraHeaders;\r\n};\r\n\r\n\r\n/**\r\n * Starts the test channel. This initiates connections to the server.\r\n *\r\n * @param {string} path The relative uri for the test connection.\r\n */\r\nBaseTestChannel.prototype.connect = function(path) {\r\n  this.path_ = path;\r\n  var sendDataUri = this.channel_.getForwardChannelUri(this.path_);\r\n\r\n  requestStats.notifyStatEvent(requestStats.Stat.TEST_STAGE_ONE_START);\r\n\r\n  // If the channel already has the result of the handshake, then skip it.\r\n  var handshakeResult = this.channel_.getConnectionState().handshakeResult;\r\n  if (goog.isDefAndNotNull(handshakeResult)) {\r\n    this.hostPrefix_ = this.channel_.correctHostPrefix(handshakeResult[0]);\r\n    this.state_ = BaseTestChannel.State_.CONNECTION_TESTING;\r\n    this.checkBufferingProxy_();\r\n    return;\r\n  }\r\n\r\n  // the first request returns server specific parameters\r\n  sendDataUri.setParameterValues('MODE', 'init');\r\n\r\n  // http-session-id to be generated as the response\r\n  if (!this.channel_.getBackgroundChannelTest() &&\r\n      this.channel_.getHttpSessionIdParam()) {\r\n    sendDataUri.setParameterValues(WebChannel.X_HTTP_SESSION_ID,\r\n        this.channel_.getHttpSessionIdParam());\r\n  }\r\n\r\n  this.request_ = ChannelRequest.createChannelRequest(this, this.channelDebug_);\r\n\r\n  this.request_.setExtraHeaders(this.extraHeaders_);\r\n\r\n  this.request_.xmlHttpGet(\r\n      sendDataUri, false /* decodeChunks */, null /* hostPrefix */);\r\n  this.state_ = BaseTestChannel.State_.INIT;\r\n};\r\n\r\n\r\n/**\r\n * Begins the second stage of the test channel where we test to see if we're\r\n * behind a buffering proxy. The server sends back a multi-chunked response\r\n * with the first chunk containing the content '1' and then two seconds later\r\n * sending the second chunk containing the content '2'. Depending on how we\r\n * receive the content, we can tell if we're behind a buffering proxy.\r\n * @private\r\n */\r\nBaseTestChannel.prototype.checkBufferingProxy_ = function() {\r\n  this.channelDebug_.debug('TestConnection: starting stage 2');\r\n\r\n  // If the test result is already available, skip its execution.\r\n  var bufferingProxyResult =\r\n      this.channel_.getConnectionState().bufferingProxyResult;\r\n  if (goog.isDefAndNotNull(bufferingProxyResult)) {\r\n    this.channelDebug_.debug(function() {\r\n      return 'TestConnection: skipping stage 2, precomputed result is ' +\r\n              bufferingProxyResult ?\r\n          'Buffered' :\r\n          'Unbuffered';\r\n    });\r\n    requestStats.notifyStatEvent(requestStats.Stat.TEST_STAGE_TWO_START);\r\n    if (bufferingProxyResult) {  // Buffered/Proxy connection\r\n      requestStats.notifyStatEvent(requestStats.Stat.PROXY);\r\n      this.channel_.testConnectionFinished(this, false);\r\n    } else {  // Unbuffered/NoProxy connection\r\n      requestStats.notifyStatEvent(requestStats.Stat.NOPROXY);\r\n      this.channel_.testConnectionFinished(this, true);\r\n    }\r\n    return;  // Skip the test\r\n  }\r\n  this.request_ = ChannelRequest.createChannelRequest(this, this.channelDebug_);\r\n  this.request_.setExtraHeaders(this.extraHeaders_);\r\n  var recvDataUri = this.channel_.getBackChannelUri(\r\n      this.hostPrefix_,\r\n      /** @type {string} */ (this.path_));\r\n\r\n  requestStats.notifyStatEvent(requestStats.Stat.TEST_STAGE_TWO_START);\r\n  recvDataUri.setParameterValues('TYPE', 'xmlhttp');\r\n\r\n  var param = this.channel_.getHttpSessionIdParam();\r\n  var value = this.channel_.getHttpSessionId();\r\n  if (param && value) {\r\n    recvDataUri.setParameterValue(param, value);\r\n  }\r\n\r\n  this.request_.xmlHttpGet(\r\n      recvDataUri, false /** decodeChunks */, this.hostPrefix_);\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.createXhrIo = function(hostPrefix) {\r\n  return this.channel_.createXhrIo(hostPrefix);\r\n};\r\n\r\n\r\n/**\r\n * Aborts the test channel.\r\n */\r\nBaseTestChannel.prototype.abort = function() {\r\n  if (this.request_) {\r\n    this.request_.cancel();\r\n    this.request_ = null;\r\n  }\r\n  this.lastStatusCode_ = -1;\r\n};\r\n\r\n\r\n/**\r\n * Returns whether the test channel is closed. The ChannelRequest object expects\r\n * this method to be implemented on its handler.\r\n *\r\n * @return {boolean} Whether the channel is closed.\r\n * @override\r\n */\r\nBaseTestChannel.prototype.isClosed = function() {\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Callback from ChannelRequest for when new data is received\r\n *\r\n * @param {ChannelRequest} req The request object.\r\n * @param {string} responseText The text of the response.\r\n * @override\r\n */\r\nBaseTestChannel.prototype.onRequestData = function(req, responseText) {\r\n  this.lastStatusCode_ = req.getLastStatusCode();\r\n  if (this.state_ == BaseTestChannel.State_.INIT) {\r\n    this.channelDebug_.debug('TestConnection: Got data for stage 1');\r\n\r\n    this.applyControlHeaders_(req);\r\n\r\n    if (!responseText) {\r\n      this.channelDebug_.debug('TestConnection: Null responseText');\r\n      // The server should always send text; something is wrong here\r\n      this.channel_.testConnectionFailure(this, ChannelRequest.Error.BAD_DATA);\r\n      return;\r\n    }\r\n\r\n\r\n    try {\r\n      var channel = /** @type {!goog.labs.net.webChannel.WebChannelBase} */ (\r\n          this.channel_);\r\n      var respArray = channel.getWireCodec().decodeMessage(responseText);\r\n    } catch (e) {\r\n      this.channelDebug_.dumpException(e);\r\n      this.channel_.testConnectionFailure(this, ChannelRequest.Error.BAD_DATA);\r\n      return;\r\n    }\r\n    this.hostPrefix_ = this.channel_.correctHostPrefix(respArray[0]);\r\n  } else if (this.state_ == BaseTestChannel.State_.CONNECTION_TESTING) {\r\n    if (this.receivedIntermediateResult_) {\r\n      requestStats.notifyStatEvent(requestStats.Stat.TEST_STAGE_TWO_DATA_TWO);\r\n    } else {\r\n      // '11111' is used instead of '1' to prevent a small amount of buffering\r\n      // by Safari.\r\n      if (responseText == '11111') {\r\n        requestStats.notifyStatEvent(requestStats.Stat.TEST_STAGE_TWO_DATA_ONE);\r\n        this.receivedIntermediateResult_ = true;\r\n        if (this.checkForEarlyNonBuffered_()) {\r\n          // If early chunk detection is on, and we passed the tests,\r\n          // assume HTTP_OK, cancel the test and turn on noproxy mode.\r\n          this.lastStatusCode_ = 200;\r\n          this.request_.cancel();\r\n          this.channelDebug_.debug(\r\n              'Test connection succeeded; using streaming connection');\r\n          requestStats.notifyStatEvent(requestStats.Stat.NOPROXY);\r\n          this.channel_.testConnectionFinished(this, true);\r\n        }\r\n      } else {\r\n        requestStats.notifyStatEvent(\r\n            requestStats.Stat.TEST_STAGE_TWO_DATA_BOTH);\r\n        this.receivedIntermediateResult_ = false;\r\n      }\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Callback from ChannelRequest that indicates a request has completed.\r\n *\r\n * @param {!ChannelRequest} req The request object.\r\n * @override\r\n */\r\nBaseTestChannel.prototype.onRequestComplete = function(req) {\r\n  this.lastStatusCode_ = this.request_.getLastStatusCode();\r\n  if (!this.request_.getSuccess()) {\r\n    this.channelDebug_.debug(\r\n        'TestConnection: request failed, in state ' + this.state_);\r\n    if (this.state_ == BaseTestChannel.State_.INIT) {\r\n      requestStats.notifyStatEvent(requestStats.Stat.TEST_STAGE_ONE_FAILED);\r\n    } else if (this.state_ == BaseTestChannel.State_.CONNECTION_TESTING) {\r\n      requestStats.notifyStatEvent(requestStats.Stat.TEST_STAGE_TWO_FAILED);\r\n    }\r\n    this.channel_.testConnectionFailure(\r\n        this,\r\n        /** @type {ChannelRequest.Error} */\r\n        (this.request_.getLastError()));\r\n    return;\r\n  }\r\n\r\n  if (this.state_ == BaseTestChannel.State_.INIT) {\r\n    this.state_ = BaseTestChannel.State_.CONNECTION_TESTING;\r\n\r\n    this.channelDebug_.debug(\r\n        'TestConnection: request complete for initial check');\r\n\r\n    this.checkBufferingProxy_();\r\n  } else if (this.state_ == BaseTestChannel.State_.CONNECTION_TESTING) {\r\n    this.channelDebug_.debug('TestConnection: request complete for stage 2');\r\n\r\n    var goodConn = this.receivedIntermediateResult_;\r\n    if (goodConn) {\r\n      this.channelDebug_.debug(\r\n          'Test connection succeeded; using streaming connection');\r\n      requestStats.notifyStatEvent(requestStats.Stat.NOPROXY);\r\n      this.channel_.testConnectionFinished(this, true);\r\n    } else {\r\n      this.channelDebug_.debug('Test connection failed; not using streaming');\r\n      requestStats.notifyStatEvent(requestStats.Stat.PROXY);\r\n      this.channel_.testConnectionFinished(this, false);\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Apply any control headers from the initial handshake response.\r\n *\r\n * @param {!ChannelRequest} req The request object.\r\n * @private\r\n */\r\nBaseTestChannel.prototype.applyControlHeaders_ = function(req) {\r\n  if (this.channel_.getBackgroundChannelTest()) {\r\n    return;\r\n  }\r\n\r\n  var xhr = req.getXhr();\r\n  if (xhr) {\r\n    var protocolHeader = xhr.getStreamingResponseHeader(\r\n        WebChannel.X_CLIENT_WIRE_PROTOCOL);\r\n    this.clientProtocol_ = protocolHeader ? protocolHeader : null;\r\n\r\n    if (this.channel_.getHttpSessionIdParam()) {\r\n      var httpSessionIdHeader = xhr.getStreamingResponseHeader(\r\n          WebChannel.X_HTTP_SESSION_ID);\r\n      if (httpSessionIdHeader) {\r\n        this.channel_.setHttpSessionId(httpSessionIdHeader);\r\n      } else {\r\n        this.channelDebug_.warning(\r\n            'Missing X_HTTP_SESSION_ID in the handshake response');\r\n      }\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {?string} The client protocol as recorded with the init handshake\r\n *     request.\r\n */\r\nBaseTestChannel.prototype.getClientProtocol = function() {\r\n  return this.clientProtocol_;\r\n};\r\n\r\n\r\n/**\r\n * Returns the last status code received for a request.\r\n * @return {number} The last status code received for a request.\r\n */\r\nBaseTestChannel.prototype.getLastStatusCode = function() {\r\n  return this.lastStatusCode_;\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether we should be using secondary domains when the\r\n *     server instructs us to do so.\r\n * @override\r\n */\r\nBaseTestChannel.prototype.shouldUseSecondaryDomains = function() {\r\n  return this.channel_.shouldUseSecondaryDomains();\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.isActive = function() {\r\n  return this.channel_.isActive();\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} True if test stage 2 detected a non-buffered\r\n *     channel early and early no buffering detection is enabled.\r\n * @private\r\n */\r\nBaseTestChannel.prototype.checkForEarlyNonBuffered_ = function() {\r\n  return ChannelRequest.supportsXhrStreaming();\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.getForwardChannelUri = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.getBackChannelUri = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.correctHostPrefix = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.createDataUri = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.testConnectionFinished = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.testConnectionFailure = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.getConnectionState = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.setHttpSessionIdParam = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.getHttpSessionIdParam = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.setHttpSessionId = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.getHttpSessionId = goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nBaseTestChannel.prototype.getBackgroundChannelTest = goog.abstractMethod;\r\n});  // goog.scope\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Codec functions of the v8 wire protocol. Eventually we'd want\r\n * to support pluggable wire-format to improve wire efficiency and to enable\r\n * binary encoding. Such support will require an interface class, which\r\n * will be added later.\r\n */\r\n\r\n\r\ngoog.provide('goog.labs.net.webChannel.WireV8');\r\n\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.json');\r\ngoog.require('goog.json.NativeJsonProcessor');\r\ngoog.require('goog.labs.net.webChannel.Wire');\r\ngoog.require('goog.structs');\r\n\r\ngoog.forwardDeclare('goog.structs.Map');\r\n\r\n\r\n\r\n/**\r\n * The v8 codec class.\r\n *\r\n * @constructor\r\n * @struct\r\n */\r\ngoog.labs.net.webChannel.WireV8 = function() {\r\n  /**\r\n   * Parser for a response payload. The parser should return an array.\r\n   * @private {!goog.string.Parser}\r\n   */\r\n  this.parser_ = new goog.json.NativeJsonProcessor();\r\n};\r\n\r\n\r\ngoog.scope(function() {\r\nvar WireV8 = goog.labs.net.webChannel.WireV8;\r\nvar Wire = goog.labs.net.webChannel.Wire;\r\n\r\n\r\n/**\r\n * Encodes a standalone message into the wire format.\r\n *\r\n * May throw exception if the message object contains any invalid elements.\r\n *\r\n * @param {!Object|!goog.structs.Map} message The message data.\r\n *     V8 only support JS objects (or Map).\r\n * @param {!Array<string>} buffer The text buffer to write the message to.\r\n * @param {string=} opt_prefix The prefix for each field of the object.\r\n */\r\nWireV8.prototype.encodeMessage = function(message, buffer, opt_prefix) {\r\n  var prefix = opt_prefix || '';\r\n  try {\r\n    goog.structs.forEach(message, function(value, key) {\r\n      var encodedValue = value;\r\n      if (goog.isObject(value)) {\r\n        encodedValue = goog.json.serialize(value);\r\n      }  // keep the fast-path for primitive types\r\n      buffer.push(prefix + key + '=' + encodeURIComponent(encodedValue));\r\n    });\r\n  } catch (ex) {\r\n    // We send a map here because lots of the retry logic relies on map IDs,\r\n    // so we have to send something (possibly redundant).\r\n    buffer.push(\r\n        prefix + 'type' +\r\n        '=' + encodeURIComponent('_badmap'));\r\n    throw ex;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Encodes all the buffered messages of the forward channel.\r\n *\r\n * @param {!Array<Wire.QueuedMap>} messageQueue The message data.\r\n *     V8 only support JS objects.\r\n * @param {number} count The number of messages to be encoded.\r\n * @param {?function(!Object)} badMapHandler Callback for bad messages.\r\n * @return {string} the encoded messages\r\n */\r\nWireV8.prototype.encodeMessageQueue = function(\r\n    messageQueue, count, badMapHandler) {\r\n  var offset = -1;\r\n  while (true) {\r\n    var sb = ['count=' + count];\r\n    // To save a bit of bandwidth, specify the base mapId and the rest as\r\n    // offsets from it.\r\n    if (offset == -1) {\r\n      if (count > 0) {\r\n        offset = messageQueue[0].mapId;\r\n        sb.push('ofs=' + offset);\r\n      } else {\r\n        offset = 0;\r\n      }\r\n    } else {\r\n      sb.push('ofs=' + offset);\r\n    }\r\n    var done = true;\r\n    for (var i = 0; i < count; i++) {\r\n      var mapId = messageQueue[i].mapId;\r\n      var map = messageQueue[i].map;\r\n      mapId -= offset;\r\n      if (mapId < 0) {\r\n        // redo the encoding in case of retry/reordering, plus extra space\r\n        offset = Math.max(0, messageQueue[i].mapId - 100);\r\n        done = false;\r\n        continue;\r\n      }\r\n      try {\r\n        this.encodeMessage(map, sb, 'req' + mapId + '_');\r\n      } catch (ex) {\r\n        if (badMapHandler) {\r\n          badMapHandler(map);\r\n        }\r\n      }\r\n    }\r\n    if (done) {\r\n      return sb.join('&');\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Decodes a standalone message received from the wire. May throw exception\r\n * if text is ill-formatted.\r\n *\r\n * Must be valid JSON as it is insecure to use eval() to decode JS literals;\r\n * and eval() is disallowed in Chrome apps too.\r\n *\r\n * Invalid JS literals include null array elements, quotas etc.\r\n *\r\n * @param {string} messageText The string content as received from the wire.\r\n * @return {*} The decoded message object.\r\n */\r\nWireV8.prototype.decodeMessage = function(messageText) {\r\n  var response = this.parser_.parse(messageText);\r\n  goog.asserts.assert(goog.isArray(response));  // throw exception\r\n  return response;\r\n};\r\n});  // goog.scope\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview This class manages the network connectivity state.\r\n */\r\n\r\n\r\ngoog.provide('goog.labs.net.webChannel.ConnectionState');\r\n\r\n\r\n\r\n/**\r\n * The connectivity state of the channel.\r\n *\r\n * @constructor\r\n * @struct\r\n */\r\ngoog.labs.net.webChannel.ConnectionState = function() {\r\n  /**\r\n   * Handshake result.\r\n   * @type {Array<string>}\r\n   */\r\n  this.handshakeResult = null;\r\n\r\n  /**\r\n   * The result of checking if there is a buffering proxy in the network.\r\n   * True means the connection is buffered, False means unbuffered,\r\n   * null means that the result is not available.\r\n   * @type {?boolean}\r\n   */\r\n  this.bufferingProxyResult = null;\r\n};\r\n","// Copyright 2006 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Datastructure: Set.\r\n *\r\n * @author arv@google.com (Erik Arvidsson)\r\n *\r\n * This class implements a set data structure. Adding and removing is O(1). It\r\n * supports both object and primitive values. Be careful because you can add\r\n * both 1 and new Number(1), because these are not the same. You can even add\r\n * multiple new Number(1) because these are not equal.\r\n */\r\n\r\n\r\ngoog.provide('goog.structs.Set');\r\n\r\ngoog.require('goog.structs');\r\ngoog.require('goog.structs.Collection');\r\ngoog.require('goog.structs.Map');\r\n\r\n/**\r\n * A set that can contain both primitives and objects.  Adding and removing\r\n * elements is O(1).  Primitives are treated as identical if they have the same\r\n * type and convert to the same string.  Objects are treated as identical only\r\n * if they are references to the same object.  WARNING: A goog.structs.Set can\r\n * contain both 1 and (new Number(1)), because they are not the same.  WARNING:\r\n * Adding (new Number(1)) twice will yield two distinct elements, because they\r\n * are two different objects.  WARNING: Any object that is added to a\r\n * goog.structs.Set will be modified!  Because goog.getUid() is used to\r\n * identify objects, every object in the set will be mutated.\r\n * @param {Array<T>|Object<?,T>=} opt_values Initial values to start with.\r\n * @constructor\r\n * @implements {goog.structs.Collection<T>}\r\n * @final\r\n * @template T\r\n * @deprecated This type is misleading: use ES6 Set instead.\r\n */\r\ngoog.structs.Set = function(opt_values) {\r\n  this.map_ = new goog.structs.Map;\r\n  if (opt_values) {\r\n    this.addAll(opt_values);\r\n  }\r\n};\r\n\r\n/**\r\n * A function that returns a unique id.\r\n * @private @const {function(?Object): number}\r\n */\r\ngoog.structs.Set.getUid_ = goog.getUid;\r\n\r\n\r\n/**\r\n * Obtains a unique key for an element of the set.  Primitives will yield the\r\n * same key if they have the same type and convert to the same string.  Object\r\n * references will yield the same key only if they refer to the same object.\r\n * @param {*} val Object or primitive value to get a key for.\r\n * @return {string} A unique key for this value/object.\r\n * @private\r\n */\r\ngoog.structs.Set.getKey_ = function(val) {\r\n  var type = typeof val;\r\n  if (type == 'object' && val || type == 'function') {\r\n    return 'o' + goog.structs.Set.getUid_(/** @type {Object} */ (val));\r\n  } else {\r\n    return type.substr(0, 1) + val;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {number} The number of elements in the set.\r\n * @override\r\n */\r\ngoog.structs.Set.prototype.getCount = function() {\r\n  return this.map_.getCount();\r\n};\r\n\r\n\r\n/**\r\n * Add a primitive or an object to the set.\r\n * @param {T} element The primitive or object to add.\r\n * @override\r\n */\r\ngoog.structs.Set.prototype.add = function(element) {\r\n  this.map_.set(goog.structs.Set.getKey_(element), element);\r\n};\r\n\r\n\r\n/**\r\n * Adds all the values in the given collection to this set.\r\n * @param {Array<T>|goog.structs.Collection<T>|Object<?,T>} col A collection\r\n *     containing the elements to add.\r\n */\r\ngoog.structs.Set.prototype.addAll = function(col) {\r\n  var values = goog.structs.getValues(col);\r\n  var l = values.length;\r\n  for (var i = 0; i < l; i++) {\r\n    this.add(values[i]);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Removes all values in the given collection from this set.\r\n * @param {Array<T>|goog.structs.Collection<T>|Object<?,T>} col A collection\r\n *     containing the elements to remove.\r\n */\r\ngoog.structs.Set.prototype.removeAll = function(col) {\r\n  var values = goog.structs.getValues(col);\r\n  var l = values.length;\r\n  for (var i = 0; i < l; i++) {\r\n    this.remove(values[i]);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Removes the given element from this set.\r\n * @param {T} element The primitive or object to remove.\r\n * @return {boolean} Whether the element was found and removed.\r\n * @override\r\n */\r\ngoog.structs.Set.prototype.remove = function(element) {\r\n  return this.map_.remove(goog.structs.Set.getKey_(element));\r\n};\r\n\r\n\r\n/**\r\n * Removes all elements from this set.\r\n */\r\ngoog.structs.Set.prototype.clear = function() {\r\n  this.map_.clear();\r\n};\r\n\r\n\r\n/**\r\n * Tests whether this set is empty.\r\n * @return {boolean} True if there are no elements in this set.\r\n */\r\ngoog.structs.Set.prototype.isEmpty = function() {\r\n  return this.map_.isEmpty();\r\n};\r\n\r\n\r\n/**\r\n * Tests whether this set contains the given element.\r\n * @param {T} element The primitive or object to test for.\r\n * @return {boolean} True if this set contains the given element.\r\n * @override\r\n */\r\ngoog.structs.Set.prototype.contains = function(element) {\r\n  return this.map_.containsKey(goog.structs.Set.getKey_(element));\r\n};\r\n\r\n\r\n/**\r\n * Tests whether this set contains all the values in a given collection.\r\n * Repeated elements in the collection are ignored, e.g.  (new\r\n * goog.structs.Set([1, 2])).containsAll([1, 1]) is True.\r\n * @param {goog.structs.Collection<T>|Object} col A collection-like object.\r\n * @return {boolean} True if the set contains all elements.\r\n */\r\ngoog.structs.Set.prototype.containsAll = function(col) {\r\n  return goog.structs.every(col, this.contains, this);\r\n};\r\n\r\n\r\n/**\r\n * Finds all values that are present in both this set and the given collection.\r\n * @param {Array<S>|Object<?,S>} col A collection.\r\n * @return {!goog.structs.Set<T|S>} A new set containing all the values\r\n *     (primitives or objects) present in both this set and the given\r\n *     collection.\r\n * @template S\r\n */\r\ngoog.structs.Set.prototype.intersection = function(col) {\r\n  var result = new goog.structs.Set();\r\n\r\n  var values = goog.structs.getValues(col);\r\n  for (var i = 0; i < values.length; i++) {\r\n    var value = values[i];\r\n    if (this.contains(value)) {\r\n      result.add(value);\r\n    }\r\n  }\r\n\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * Finds all values that are present in this set and not in the given\r\n * collection.\r\n * @param {Array<T>|goog.structs.Collection<T>|Object<?,T>} col A collection.\r\n * @return {!goog.structs.Set} A new set containing all the values\r\n *     (primitives or objects) present in this set but not in the given\r\n *     collection.\r\n */\r\ngoog.structs.Set.prototype.difference = function(col) {\r\n  var result = this.clone();\r\n  result.removeAll(col);\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * Returns an array containing all the elements in this set.\r\n * @return {!Array<T>} An array containing all the elements in this set.\r\n */\r\ngoog.structs.Set.prototype.getValues = function() {\r\n  return this.map_.getValues();\r\n};\r\n\r\n\r\n/**\r\n * Creates a shallow clone of this set.\r\n * @return {!goog.structs.Set<T>} A new set containing all the same elements as\r\n *     this set.\r\n */\r\ngoog.structs.Set.prototype.clone = function() {\r\n  return new goog.structs.Set(this);\r\n};\r\n\r\n\r\n/**\r\n * Tests whether the given collection consists of the same elements as this set,\r\n * regardless of order, without repetition.  Primitives are treated as equal if\r\n * they have the same type and convert to the same string; objects are treated\r\n * as equal if they are references to the same object.  This operation is O(n).\r\n * @param {goog.structs.Collection<T>|Object} col A collection.\r\n * @return {boolean} True if the given collection consists of the same elements\r\n *     as this set, regardless of order, without repetition.\r\n */\r\ngoog.structs.Set.prototype.equals = function(col) {\r\n  return this.getCount() == goog.structs.getCount(col) && this.isSubsetOf(col);\r\n};\r\n\r\n\r\n/**\r\n * Tests whether the given collection contains all the elements in this set.\r\n * Primitives are treated as equal if they have the same type and convert to the\r\n * same string; objects are treated as equal if they are references to the same\r\n * object.  This operation is O(n).\r\n * @param {goog.structs.Collection<T>|Object} col A collection.\r\n * @return {boolean} True if this set is a subset of the given collection.\r\n */\r\ngoog.structs.Set.prototype.isSubsetOf = function(col) {\r\n  var colCount = goog.structs.getCount(col);\r\n  if (this.getCount() > colCount) {\r\n    return false;\r\n  }\r\n  // TODO(user) Find the minimal collection size where the conversion makes\r\n  // the contains() method faster.\r\n  if (!(col instanceof goog.structs.Set) && colCount > 5) {\r\n    // Convert to a goog.structs.Set so that goog.structs.contains runs in\r\n    // O(1) time instead of O(n) time.\r\n    col = new goog.structs.Set(col);\r\n  }\r\n  return goog.structs.every(\r\n      this, function(value) { return goog.structs.contains(col, value); });\r\n};\r\n\r\n\r\n/**\r\n * Returns an iterator that iterates over the elements in this set.\r\n * @param {boolean=} opt_keys This argument is ignored.\r\n * @return {!goog.iter.Iterator} An iterator over the elements in this set.\r\n */\r\ngoog.structs.Set.prototype.__iterator__ = function(opt_keys) {\r\n  return this.map_.__iterator__(false);\r\n};\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Interface and shared data structures for implementing\r\n * different wire protocol versions.\r\n */\r\n\r\n\r\ngoog.provide('goog.labs.net.webChannel.Wire');\r\n\r\ngoog.forwardDeclare('goog.structs.Map');\r\n\r\n\r\n\r\n/**\r\n * The interface class.\r\n *\r\n * @interface\r\n */\r\ngoog.labs.net.webChannel.Wire = function() {};\r\n\r\n\r\ngoog.scope(function() {\r\nvar Wire = goog.labs.net.webChannel.Wire;\r\n\r\n\r\n/**\r\n * The latest protocol version that this class supports. We request this version\r\n * from the server when opening the connection. Should match\r\n * LATEST_CHANNEL_VERSION on the server code.\r\n * @type {number}\r\n */\r\nWire.LATEST_CHANNEL_VERSION = 8;\r\n\r\n\r\n/**\r\n * The JSON field key for the raw data wrapper object.\r\n * @type {string}\r\n */\r\nWire.RAW_DATA_KEY = '__data__';\r\n\r\n\r\n\r\n/**\r\n * Simple container class for a (mapId, map) pair.\r\n * @param {number} mapId The id for this map.\r\n * @param {!Object|!goog.structs.Map} map The map itself.\r\n * @param {!Object=} opt_context The context associated with the map.\r\n * @constructor\r\n * @struct\r\n */\r\nWire.QueuedMap = function(mapId, map, opt_context) {\r\n  /**\r\n   * The id for this map.\r\n   * @type {number}\r\n   */\r\n  this.mapId = mapId;\r\n\r\n  /**\r\n   * The map itself.\r\n   * @type {!Object|!goog.structs.Map}\r\n   */\r\n  this.map = map;\r\n\r\n  /**\r\n   * The context for the map.\r\n   * @type {Object}\r\n   */\r\n  this.context = opt_context || null;\r\n};\r\n\r\n\r\n/**\r\n * @return {number|undefined} the size of the raw JSON message or\r\n * undefined if the message is not encoded as a raw JSON message\r\n */\r\nWire.QueuedMap.prototype.getRawDataSize = function() {\r\n  if (Wire.RAW_DATA_KEY in this.map) {\r\n    var data = this.map[Wire.RAW_DATA_KEY];\r\n    if (goog.isString(data)) {\r\n      return data.length;\r\n    }\r\n  }\r\n\r\n  return undefined;\r\n};\r\n});  // goog.scope\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview A pool of forward channel requests to enable real-time\r\n * messaging from the client to server.\r\n */\r\n\r\ngoog.module('goog.labs.net.webChannel.ForwardChannelRequestPool');\r\n\r\ngoog.module.declareLegacyNamespace();\r\n\r\nvar ChannelRequest = goog.require('goog.labs.net.webChannel.ChannelRequest');\r\nvar Set = goog.require('goog.structs.Set');\r\nvar Wire = goog.require('goog.labs.net.webChannel.Wire');\r\nvar array = goog.require('goog.array');\r\nvar googString = goog.require('goog.string');\r\n\r\n\r\n/**\r\n * This class represents the state of all forward channel requests.\r\n *\r\n * @param {number=} opt_maxPoolSize The maximum pool size.\r\n *\r\n * @struct @constructor @final\r\n */\r\nvar ForwardChannelRequestPool = function(opt_maxPoolSize) {\r\n  /**\r\n   * The max pool size as configured.\r\n   *\r\n   * @private {number}\r\n   */\r\n  this.maxPoolSizeConfigured_ =\r\n      opt_maxPoolSize || ForwardChannelRequestPool.MAX_POOL_SIZE_;\r\n\r\n  /**\r\n   * The current size limit of the request pool. This limit is meant to be\r\n   * read-only after the channel is fully opened.\r\n   *\r\n   * If SPDY or HTTP2 is enabled, set it to the max pool size, which is also\r\n   * configurable.\r\n   *\r\n   * @private {number}\r\n   */\r\n  this.maxSize_ = ForwardChannelRequestPool.isSpdyOrHttp2Enabled_() ?\r\n      this.maxPoolSizeConfigured_ :\r\n      1;\r\n\r\n  /**\r\n   * The container for all the pending request objects.\r\n   *\r\n   * @private {Set<ChannelRequest>}\r\n   */\r\n  this.requestPool_ = null;\r\n\r\n  if (this.maxSize_ > 1) {\r\n    this.requestPool_ = new Set();\r\n  }\r\n\r\n  /**\r\n   * The single request object when the pool size is limited to one.\r\n   *\r\n   * @private {ChannelRequest}\r\n   */\r\n  this.request_ = null;\r\n\r\n  /**\r\n   * Saved pending messages when the pool is cancelled.\r\n   *\r\n   * @private {!Array<Wire.QueuedMap>}\r\n   */\r\n  this.pendingMessages_ = [];\r\n};\r\n\r\n\r\n/**\r\n * The default size limit of the request pool.\r\n *\r\n * @private {number}\r\n */\r\nForwardChannelRequestPool.MAX_POOL_SIZE_ = 10;\r\n\r\n\r\n/**\r\n * @return {boolean} True if SPDY or HTTP2 is enabled. Uses chrome-specific APIs\r\n *     as a fallback and will always return false for other browsers where\r\n *     PerformanceNavigationTiming is not available.\r\n * @private\r\n */\r\nForwardChannelRequestPool.isSpdyOrHttp2Enabled_ = function() {\r\n  if (goog.global.PerformanceNavigationTiming) {\r\n    var entrys = /** @type {!Array<!PerformanceNavigationTiming>} */ (\r\n        goog.global.performance.getEntriesByType('navigation'));\r\n    return entrys.length > 0 &&\r\n        (entrys[0].nextHopProtocol == 'hq' ||\r\n         entrys[0].nextHopProtocol == 'h2');\r\n  }\r\n  return !!(\r\n      goog.global.chrome && goog.global.chrome.loadTimes &&\r\n      goog.global.chrome.loadTimes() &&\r\n      goog.global.chrome.loadTimes().wasFetchedViaSpdy);\r\n};\r\n\r\n\r\n/**\r\n * Once we know the client protocol (from the handshake), check if we need\r\n * enable the request pool accordingly. This is more robust than using\r\n * browser-internal APIs (specific to Chrome).\r\n *\r\n * @param {string} clientProtocol The client protocol\r\n */\r\nForwardChannelRequestPool.prototype.applyClientProtocol = function(\r\n    clientProtocol) {\r\n  if (this.requestPool_) {\r\n    return;\r\n  }\r\n\r\n  if (googString.contains(clientProtocol, 'spdy') ||\r\n      googString.contains(clientProtocol, 'quic') ||\r\n      googString.contains(clientProtocol, 'h2')) {\r\n    this.maxSize_ = this.maxPoolSizeConfigured_;\r\n    this.requestPool_ = new Set();\r\n    if (this.request_) {\r\n      this.addRequest(this.request_);\r\n      this.request_ = null;\r\n    }\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} True if the pool is full.\r\n */\r\nForwardChannelRequestPool.prototype.isFull = function() {\r\n  if (this.request_) {\r\n    return true;\r\n  }\r\n\r\n  if (this.requestPool_) {\r\n    return this.requestPool_.getCount() >= this.maxSize_;\r\n  }\r\n\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * @return {number} The current size limit.\r\n */\r\nForwardChannelRequestPool.prototype.getMaxSize = function() {\r\n  return this.maxSize_;\r\n};\r\n\r\n\r\n/**\r\n * @return {number} The number of pending requests in the pool.\r\n */\r\nForwardChannelRequestPool.prototype.getRequestCount = function() {\r\n  if (this.request_) {\r\n    return 1;\r\n  }\r\n\r\n  if (this.requestPool_) {\r\n    return this.requestPool_.getCount();\r\n  }\r\n\r\n  return 0;\r\n};\r\n\r\n\r\n/**\r\n * @param {ChannelRequest} req The channel request.\r\n * @return {boolean} True if the request is a included inside the pool.\r\n */\r\nForwardChannelRequestPool.prototype.hasRequest = function(req) {\r\n  if (this.request_) {\r\n    return this.request_ == req;\r\n  }\r\n\r\n  if (this.requestPool_) {\r\n    return this.requestPool_.contains(req);\r\n  }\r\n\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Adds a new request to the pool.\r\n *\r\n * @param {!ChannelRequest} req The new channel request.\r\n */\r\nForwardChannelRequestPool.prototype.addRequest = function(req) {\r\n  if (this.requestPool_) {\r\n    this.requestPool_.add(req);\r\n  } else {\r\n    this.request_ = req;\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Removes the given request from the pool.\r\n *\r\n * @param {ChannelRequest} req The channel request.\r\n * @return {boolean} Whether the request has been removed from the pool.\r\n */\r\nForwardChannelRequestPool.prototype.removeRequest = function(req) {\r\n  if (this.request_ && this.request_ == req) {\r\n    this.request_ = null;\r\n    return true;\r\n  }\r\n\r\n  if (this.requestPool_ && this.requestPool_.contains(req)) {\r\n    this.requestPool_.remove(req);\r\n    return true;\r\n  }\r\n\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Clears the pool and cancel all the pending requests.\r\n */\r\nForwardChannelRequestPool.prototype.cancel = function() {\r\n  // save any pending messages\r\n  this.pendingMessages_ = this.getPendingMessages();\r\n\r\n  if (this.request_) {\r\n    this.request_.cancel();\r\n    this.request_ = null;\r\n    return;\r\n  }\r\n\r\n  if (this.requestPool_ && !this.requestPool_.isEmpty()) {\r\n    array.forEach(this.requestPool_.getValues(), function(val) {\r\n      val.cancel();\r\n    });\r\n    this.requestPool_.clear();\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @return {boolean} Whether there are any pending requests.\r\n */\r\nForwardChannelRequestPool.prototype.hasPendingRequest = function() {\r\n  return (this.request_ != null) ||\r\n      (this.requestPool_ != null && !this.requestPool_.isEmpty());\r\n};\r\n\r\n\r\n/**\r\n * @return {!Array<Wire.QueuedMap>} All the pending messages from the pool,\r\n *     as a new array.\r\n */\r\nForwardChannelRequestPool.prototype.getPendingMessages = function() {\r\n  if (this.request_ != null) {\r\n    return this.pendingMessages_.concat(this.request_.getPendingMessages());\r\n  }\r\n\r\n  if (this.requestPool_ != null && !this.requestPool_.isEmpty()) {\r\n    var result = this.pendingMessages_;\r\n    array.forEach(this.requestPool_.getValues(), function(val) {\r\n      result = result.concat(val.getPendingMessages());\r\n    });\r\n    return result;\r\n  }\r\n\r\n  return array.clone(this.pendingMessages_);\r\n};\r\n\r\n\r\n/**\r\n * Records pending messages, e.g. when a request receives a failed response.\r\n *\r\n * @param {!Array<Wire.QueuedMap>} messages Pending messages.\r\n */\r\nForwardChannelRequestPool.prototype.addPendingMessages = function(messages) {\r\n  this.pendingMessages_ = this.pendingMessages_.concat(messages);\r\n};\r\n\r\n\r\n/**\r\n * Clears any recorded pending messages.\r\n */\r\nForwardChannelRequestPool.prototype.clearPendingMessages = function() {\r\n  this.pendingMessages_.length = 0;\r\n};\r\n\r\n\r\n/**\r\n * Cancels all pending requests and force the completion of channel requests.\r\n *\r\n * Need go through the standard onRequestComplete logic to expose the max-retry\r\n * failure in the standard way.\r\n *\r\n * @param {function(!ChannelRequest)} onComplete The completion callback.\r\n * @return {boolean} true if any request has been forced to complete.\r\n */\r\nForwardChannelRequestPool.prototype.forceComplete = function(onComplete) {\r\n  if (this.request_ != null) {\r\n    this.request_.cancel();\r\n    onComplete(this.request_);\r\n    return true;\r\n  }\r\n\r\n  if (this.requestPool_ && !this.requestPool_.isEmpty()) {\r\n    array.forEach(this.requestPool_.getValues(), function(val) {\r\n      val.cancel();\r\n      onComplete(val);\r\n    });\r\n    return true;\r\n  }\r\n\r\n  return false;\r\n};\r\n\r\nexports = ForwardChannelRequestPool;\r\n","// Copyright 2012 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n\r\n/**\r\n * @fileoverview Defines a class for parsing JSON using the browser's built in\r\n * JSON library.\r\n */\r\n\r\ngoog.provide('goog.json.NativeJsonProcessor');\r\n\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.json.Processor');\r\n\r\n\r\n\r\n/**\r\n * A class that parses and stringifies JSON using the browser's built-in JSON\r\n * library, if it is available.\r\n *\r\n * Note that the native JSON api has subtle differences across browsers, so\r\n * use this implementation with care.  See json_test#assertSerialize\r\n * for details on the differences from goog.json.\r\n *\r\n * This implementation is signficantly faster than goog.json, at least on\r\n * Chrome.  See json_perf.html for a perf test showing the difference.\r\n *\r\n * @param {?goog.json.Replacer=} opt_replacer An optional replacer to use during\r\n *     serialization.\r\n * @param {?goog.json.Reviver=} opt_reviver An optional reviver to use during\r\n *     parsing.\r\n * @constructor\r\n * @implements {goog.json.Processor}\r\n * @final\r\n */\r\ngoog.json.NativeJsonProcessor = function(opt_replacer, opt_reviver) {\r\n  goog.asserts.assert(goog.isDef(goog.global['JSON']), 'JSON not defined');\r\n\r\n  /**\r\n   * @type {goog.json.Replacer|null|undefined}\r\n   * @private\r\n   */\r\n  this.replacer_ = opt_replacer;\r\n\r\n  /**\r\n   * @type {goog.json.Reviver|null|undefined}\r\n   * @private\r\n   */\r\n  this.reviver_ = opt_reviver;\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.json.NativeJsonProcessor.prototype.stringify = function(object) {\r\n  return goog.global['JSON'].stringify(object, this.replacer_);\r\n};\r\n\r\n\r\n/** @override */\r\ngoog.json.NativeJsonProcessor.prototype.parse = function(s) {\r\n  return goog.global['JSON'].parse(s, this.reviver_);\r\n};\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Utility functions for managing networking, such as\r\n * testing network connectivity.\r\n */\r\n\r\n\r\ngoog.provide('goog.labs.net.webChannel.netUtils');\r\n\r\ngoog.require('goog.Uri');\r\ngoog.require('goog.labs.net.webChannel.WebChannelDebug');\r\n\r\ngoog.scope(function() {\r\nvar netUtils = goog.labs.net.webChannel.netUtils;\r\nvar WebChannelDebug = goog.labs.net.webChannel.WebChannelDebug;\r\n\r\n\r\n/**\r\n * Default timeout to allow for URI pings.\r\n * @type {number}\r\n */\r\nnetUtils.NETWORK_TIMEOUT = 10000;\r\n\r\n\r\n/**\r\n * Pings the network with an image URI to check if an error is a server error\r\n * or user's network error.\r\n *\r\n * The caller needs to add a 'rand' parameter to make sure the response is\r\n * not fulfilled by browser cache.\r\n *\r\n * @param {function(boolean)} callback The function to call back with results.\r\n * @param {goog.Uri=} opt_imageUri The URI (of an image) to use for the network\r\n *     test.\r\n */\r\nnetUtils.testNetwork = function(callback, opt_imageUri) {\r\n  var uri = opt_imageUri;\r\n  if (!uri) {\r\n    // default google.com image\r\n    uri = new goog.Uri('//www.google.com/images/cleardot.gif');\r\n\r\n    if (!(goog.global.location && goog.global.location.protocol == 'http')) {\r\n      uri.setScheme('https');  // e.g. chrome-extension\r\n    }\r\n    uri.makeUnique();\r\n  }\r\n\r\n  netUtils.testLoadImage(uri.toString(), netUtils.NETWORK_TIMEOUT, callback);\r\n};\r\n\r\n\r\n/**\r\n * Test loading the given image, retrying if necessary.\r\n * @param {string} url URL to the image.\r\n * @param {number} timeout Milliseconds before giving up.\r\n * @param {function(boolean)} callback Function to call with results.\r\n * @param {number} retries The number of times to retry.\r\n * @param {!WebChannelDebug} channelDebug The debug object\r\n * @param {number=} opt_pauseBetweenRetriesMS Optional number of milliseconds\r\n *     between retries - defaults to 0.\r\n */\r\nnetUtils.testLoadImageWithRetries = function(\r\n    url, timeout, callback, retries, channelDebug, opt_pauseBetweenRetriesMS) {\r\n  channelDebug.debug('TestLoadImageWithRetries: ' + opt_pauseBetweenRetriesMS);\r\n  if (retries == 0) {\r\n    // no more retries, give up\r\n    callback(false);\r\n    return;\r\n  }\r\n\r\n  var pauseBetweenRetries = opt_pauseBetweenRetriesMS || 0;\r\n  retries--;\r\n  netUtils.testLoadImage(url, timeout, function(succeeded) {\r\n    if (succeeded) {\r\n      callback(true);\r\n    } else {\r\n      // try again\r\n      goog.global.setTimeout(function() {\r\n        netUtils.testLoadImageWithRetries(\r\n            url, timeout, callback, retries, channelDebug, pauseBetweenRetries);\r\n      }, pauseBetweenRetries);\r\n    }\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Test loading the given image.\r\n * @param {string} url URL to the image.\r\n * @param {number} timeout Milliseconds before giving up.\r\n * @param {function(boolean)} callback Function to call with results.\r\n * @suppress {strictMissingProperties} Part of the go/strict_warnings_migration\r\n */\r\nnetUtils.testLoadImage = function(url, timeout, callback) {\r\n  var channelDebug = new WebChannelDebug();\r\n  channelDebug.debug('TestLoadImage: loading ' + url);\r\n  if (goog.global.Image) {\r\n    var img = new Image();\r\n    img.onload = goog.partial(\r\n        netUtils.imageCallback_, channelDebug, img, 'TestLoadImage: loaded',\r\n        true, callback);\r\n    img.onerror = goog.partial(\r\n        netUtils.imageCallback_, channelDebug, img, 'TestLoadImage: error',\r\n        false, callback);\r\n    img.onabort = goog.partial(\r\n        netUtils.imageCallback_, channelDebug, img, 'TestLoadImage: abort',\r\n        false, callback);\r\n    img.ontimeout = goog.partial(\r\n        netUtils.imageCallback_, channelDebug, img, 'TestLoadImage: timeout',\r\n        false, callback);\r\n\r\n    goog.global.setTimeout(function() {\r\n      if (img.ontimeout) {\r\n        img.ontimeout();\r\n      }\r\n    }, timeout);\r\n    img.src = url;\r\n  } else {\r\n    // log ERROR_OTHER from environements where Image is not supported\r\n    callback(false);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Wrap the image callback with debug and cleanup logic.\r\n * @param {!WebChannelDebug} channelDebug The WebChannelDebug object.\r\n * @param {!Image} img The image element.\r\n * @param {string} debugText The debug text.\r\n * @param {boolean} result The result of image loading.\r\n * @param {function(boolean)} callback The image callback.\r\n * @private\r\n */\r\nnetUtils.imageCallback_ = function(\r\n    channelDebug, img, debugText, result, callback) {\r\n  try {\r\n    channelDebug.debug(debugText);\r\n    netUtils.clearImageCallbacks_(img);\r\n    callback(result);\r\n  } catch (e) {\r\n    channelDebug.dumpException(e);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * Clears handlers to avoid memory leaks.\r\n * @param {Image} img The image to clear handlers from.\r\n * @private\r\n * @suppress {strictMissingProperties} Part of the go/strict_warnings_migration\r\n */\r\nnetUtils.clearImageCallbacks_ = function(img) {\r\n  img.onload = null;\r\n  img.onerror = null;\r\n  img.onabort = null;\r\n  img.ontimeout = null;\r\n};\r\n});  // goog.scope\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n\r\n/**\r\n * @fileoverview Utility to attempt native JSON processing, falling back to\r\n *     goog.json if not available.\r\n *\r\n *     This is intended as a drop-in for current users of goog.json who want\r\n *     to take advantage of native JSON if present.\r\n *\r\n * @author nnaze@google.com (Nathan Naze)\r\n */\r\n\r\ngoog.provide('goog.json.hybrid');\r\n\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.json');\r\n\r\n\r\n/**\r\n * Attempts to serialize the JSON string natively, falling back to\r\n * `goog.json.serialize` if unsuccessful.\r\n * @param {!Object} obj JavaScript object to serialize to JSON.\r\n * @return {string} Resulting JSON string.\r\n */\r\ngoog.json.hybrid.stringify =\r\n    goog.json.USE_NATIVE_JSON ? goog.global['JSON']['stringify'] : function(\r\n                                                                       obj) {\r\n      if (goog.global.JSON) {\r\n        try {\r\n          return goog.global.JSON.stringify(obj);\r\n        } catch (e) {\r\n          // Native serialization failed.  Fall through to retry with\r\n          // goog.json.serialize.\r\n        }\r\n      }\r\n\r\n      return goog.json.serialize(obj);\r\n    };\r\n\r\n\r\n/**\r\n * Attempts to parse the JSON string natively, falling back to\r\n * the supplied `fallbackParser` if unsuccessful.\r\n * @param {string} jsonString JSON string to parse.\r\n * @param {function(string):Object} fallbackParser Fallback JSON parser used\r\n *     if native\r\n * @return {?Object} Resulting JSON object.\r\n * @private\r\n */\r\ngoog.json.hybrid.parse_ = function(jsonString, fallbackParser) {\r\n  if (goog.global.JSON) {\r\n    try {\r\n      var obj = goog.global.JSON.parse(jsonString);\r\n      goog.asserts.assert(typeof obj == 'object');\r\n      return /** @type {?Object} */ (obj);\r\n    } catch (e) {\r\n      // Native parse failed.  Fall through to retry with goog.json.parse.\r\n    }\r\n  }\r\n\r\n  return fallbackParser(jsonString);\r\n};\r\n\r\n\r\n/**\r\n * Attempts to parse the JSON string natively, falling back to\r\n * `goog.json.parse` if unsuccessful.\r\n * @param {string} jsonString JSON string to parse.\r\n * @return {?Object} Resulting JSON object.\r\n */\r\ngoog.json.hybrid.parse =\r\n    goog.json.USE_NATIVE_JSON ? goog.global['JSON']['parse'] : function(\r\n                                                                   jsonString) {\r\n      return goog.json.hybrid.parse_(jsonString, goog.json.parse);\r\n    };\r\n","// Copyright 2011 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Constants for HTTP status codes.\r\n */\r\n\r\ngoog.provide('goog.net.HttpStatus');\r\n\r\n\r\n/**\r\n * HTTP Status Codes defined in RFC 2616, RFC 6585, RFC 4918 and RFC 7538.\r\n * @see http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html\r\n * @see http://tools.ietf.org/html/rfc6585\r\n * @see https://tools.ietf.org/html/rfc4918\r\n * @see https://tools.ietf.org/html/rfc7538\r\n * @enum {number}\r\n */\r\ngoog.net.HttpStatus = {\r\n  // Informational 1xx\r\n  CONTINUE: 100,\r\n  SWITCHING_PROTOCOLS: 101,\r\n\r\n  // Successful 2xx\r\n  OK: 200,\r\n  CREATED: 201,\r\n  ACCEPTED: 202,\r\n  NON_AUTHORITATIVE_INFORMATION: 203,\r\n  NO_CONTENT: 204,\r\n  RESET_CONTENT: 205,\r\n  PARTIAL_CONTENT: 206,\r\n  MULTI_STATUS: 207,\r\n\r\n  // Redirection 3xx\r\n  MULTIPLE_CHOICES: 300,\r\n  MOVED_PERMANENTLY: 301,\r\n  FOUND: 302,\r\n  SEE_OTHER: 303,\r\n  NOT_MODIFIED: 304,\r\n  USE_PROXY: 305,\r\n  TEMPORARY_REDIRECT: 307,\r\n  PERMANENT_REDIRECT: 308,\r\n\r\n  // Client Error 4xx\r\n  BAD_REQUEST: 400,\r\n  UNAUTHORIZED: 401,\r\n  PAYMENT_REQUIRED: 402,\r\n  FORBIDDEN: 403,\r\n  NOT_FOUND: 404,\r\n  METHOD_NOT_ALLOWED: 405,\r\n  NOT_ACCEPTABLE: 406,\r\n  PROXY_AUTHENTICATION_REQUIRED: 407,\r\n  REQUEST_TIMEOUT: 408,\r\n  CONFLICT: 409,\r\n  GONE: 410,\r\n  LENGTH_REQUIRED: 411,\r\n  PRECONDITION_FAILED: 412,\r\n  REQUEST_ENTITY_TOO_LARGE: 413,\r\n  REQUEST_URI_TOO_LONG: 414,\r\n  UNSUPPORTED_MEDIA_TYPE: 415,\r\n  REQUEST_RANGE_NOT_SATISFIABLE: 416,\r\n  EXPECTATION_FAILED: 417,\r\n  UNPROCESSABLE_ENTITY: 422,\r\n  LOCKED: 423,\r\n  FAILED_DEPENDENCY: 424,\r\n  PRECONDITION_REQUIRED: 428,\r\n  TOO_MANY_REQUESTS: 429,\r\n  REQUEST_HEADER_FIELDS_TOO_LARGE: 431,\r\n\r\n  // Server Error 5xx\r\n  INTERNAL_SERVER_ERROR: 500,\r\n  NOT_IMPLEMENTED: 501,\r\n  BAD_GATEWAY: 502,\r\n  SERVICE_UNAVAILABLE: 503,\r\n  GATEWAY_TIMEOUT: 504,\r\n  HTTP_VERSION_NOT_SUPPORTED: 505,\r\n  INSUFFICIENT_STORAGE: 507,\r\n  NETWORK_AUTHENTICATION_REQUIRED: 511,\r\n\r\n  /*\r\n   * IE returns this code for 204 due to its use of URLMon, which returns this\r\n   * code for 'Operation Aborted'. The status text is 'Unknown', the response\r\n   * headers are ''. Known to occur on IE 6 on XP through IE9 on Win7.\r\n   */\r\n  QUIRK_IE_NO_CONTENT: 1223\r\n};\r\n\r\n\r\n/**\r\n * Returns whether the given status should be considered successful.\r\n *\r\n * Successful codes are OK (200), CREATED (201), ACCEPTED (202),\r\n * NO CONTENT (204), PARTIAL CONTENT (206), NOT MODIFIED (304),\r\n * and IE's no content code (1223).\r\n *\r\n * @param {number} status The status code to test.\r\n * @return {boolean} Whether the status code should be considered successful.\r\n */\r\ngoog.net.HttpStatus.isSuccess = function(status) {\r\n  switch (status) {\r\n    case goog.net.HttpStatus.OK:\r\n    case goog.net.HttpStatus.CREATED:\r\n    case goog.net.HttpStatus.ACCEPTED:\r\n    case goog.net.HttpStatus.NO_CONTENT:\r\n    case goog.net.HttpStatus.PARTIAL_CONTENT:\r\n    case goog.net.HttpStatus.NOT_MODIFIED:\r\n    case goog.net.HttpStatus.QUIRK_IE_NO_CONTENT:\r\n      return true;\r\n\r\n    default:\r\n      return false;\r\n  }\r\n};\r\n","// Copyright 2017 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Provides CORS support for HTTP based RPC requests.\r\n *\r\n * As part of net.rpc package, CORS features provided by this class\r\n * depend on the server support. Please check related specs to decide how\r\n * to enable any of the features provided by this class.\r\n *\r\n */\r\n\r\ngoog.module('goog.net.rpc.HttpCors');\r\n\r\nvar GoogUri = goog.require('goog.Uri');\r\nvar googObject = goog.require('goog.object');\r\nvar googString = goog.require('goog.string');\r\nvar googUriUtils = goog.require('goog.uri.utils');\r\n\r\n\r\n/**\r\n * The default URL parameter name to overwrite http headers with a URL param\r\n * to avoid CORS preflight.\r\n *\r\n * See https://github.com/whatwg/fetch/issues/210#issue-129531743 for the spec.\r\n *\r\n * @type {string}\r\n */\r\nexports.HTTP_HEADERS_PARAM_NAME = '$httpHeaders';\r\n\r\n\r\n/**\r\n * The default URL parameter name to overwrite http method with a URL param\r\n * to avoid CORS preflight.\r\n *\r\n * See https://github.com/whatwg/fetch/issues/210#issue-129531743 for the spec.\r\n *\r\n * @type {string}\r\n */\r\nexports.HTTP_METHOD_PARAM_NAME = '$httpMethod';\r\n\r\n\r\n/**\r\n * Generates the URL parameter value with custom headers encoded as\r\n * HTTP/1.1 headers block.\r\n *\r\n * @param {!Object<string, string>} headers The custom headers.\r\n * @return {string} The URL param to overwrite custom HTTP headers.\r\n */\r\nexports.generateHttpHeadersOverwriteParam = function(headers) {\r\n  var result = '';\r\n  googObject.forEach(headers, function(value, key) {\r\n    result += key;\r\n    result += ':';\r\n    result += value;\r\n    result += '\\r\\n';\r\n  });\r\n  return result;\r\n};\r\n\r\n\r\n/**\r\n * Generates the URL-encoded URL parameter value with custom headers encoded as\r\n * HTTP/1.1 headers block.\r\n *\r\n * @param {!Object<string, string>} headers The custom headers.\r\n * @return {string} The URL param to overwrite custom HTTP headers.\r\n */\r\nexports.generateEncodedHttpHeadersOverwriteParam = function(headers) {\r\n  return googString.urlEncode(\r\n      exports.generateHttpHeadersOverwriteParam(headers));\r\n};\r\n\r\n\r\n/**\r\n * Sets custom HTTP headers via an overwrite URL param.\r\n *\r\n * @param {!GoogUri|string} url The URI object or a string path.\r\n * @param {string} urlParam The URL param name.\r\n * @param {!Object<string, string>} extraHeaders The HTTP headers.\r\n * @return {!GoogUri|string} The URI object or a string path with headers\r\n * encoded as a url param.\r\n */\r\nexports.setHttpHeadersWithOverwriteParam = function(\r\n    url, urlParam, extraHeaders) {\r\n  if (googObject.isEmpty(extraHeaders)) {\r\n    return url;\r\n  }\r\n  var httpHeaders = exports.generateHttpHeadersOverwriteParam(extraHeaders);\r\n  if (goog.isString(url)) {\r\n    return googUriUtils.appendParam(\r\n        url, googString.urlEncode(urlParam), httpHeaders);\r\n  } else {\r\n    url.setParameterValue(urlParam, httpHeaders);  // duplicate removed!\r\n    return url;\r\n  }\r\n};\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Transport support for WebChannel.\r\n *\r\n * The <code>WebChannelTransport</code> implementation serves as the factory\r\n * for <code>WebChannel</code>, which offers an abstraction for\r\n * point-to-point socket-like communication similar to what BrowserChannel\r\n * or HTML5 WebSocket offers.\r\n *\r\n */\r\n\r\ngoog.provide('goog.net.WebChannelTransport');\r\n\r\ngoog.forwardDeclare('goog.net.WebChannel');\r\ngoog.forwardDeclare('goog.net.WebChannel.Options');\r\n\r\n\r\n\r\n/**\r\n * A WebChannelTransport instance represents a shared context of logical\r\n * connectivity between a browser client and a remote origin.\r\n *\r\n * Over a single WebChannelTransport instance, multiple WebChannels may be\r\n * created against different URLs, which may all share the same\r\n * underlying connectivity (i.e. TCP connection) whenever possible.\r\n *\r\n * When multi-domains are supported, such as CORS, multiple origins may be\r\n * supported over a single WebChannelTransport instance at the same time.\r\n *\r\n * Sharing between different window contexts such as tabs is not addressed\r\n * by WebChannelTransport. Applications may choose HTML5 shared workers\r\n * or other techniques to access the same transport instance\r\n * across different window contexts.\r\n *\r\n * @interface\r\n */\r\ngoog.net.WebChannelTransport = function() {};\r\n\r\n\r\n/**\r\n * The client version. This integer value will be passed to the server\r\n * when a channel is opened to inform the server the client \"capabilities\".\r\n *\r\n * Wire protocol version is a different concept and is internal to the\r\n * transport implementation.\r\n *\r\n * @const\r\n * @type {number}\r\n */\r\ngoog.net.WebChannelTransport.CLIENT_VERSION = 22;\r\n\r\n\r\n/**\r\n * Create a new WebChannel instance.\r\n *\r\n * The new WebChannel is to be opened against the server-side resource\r\n * as specified by the given URL. See {@link goog.net.WebChannel} for detailed\r\n * semantics.\r\n *\r\n * @param {string} url The URL path for the new WebChannel instance.\r\n * @param {!goog.net.WebChannel.Options=} opt_options Configuration for the\r\n *     new WebChannel instance. The configuration object is reusable after\r\n *     the new channel instance is created.\r\n * @return {!goog.net.WebChannel} the newly created WebChannel instance.\r\n */\r\ngoog.net.WebChannelTransport.prototype.createWebChannel = goog.abstractMethod;\r\n","// Copyright 2010 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Utilities for dealing with POSIX path strings. Based on\r\n * Python's os.path and posixpath.\r\n * @author nnaze@google.com (Nathan Naze)\r\n */\r\n\r\ngoog.provide('goog.string.path');\r\n\r\ngoog.require('goog.array');\r\ngoog.require('goog.string');\r\n\r\n\r\n/**\r\n * Returns the final component of a pathname.\r\n * See http://docs.python.org/library/os.path.html#os.path.basename\r\n * @param {string} path A pathname.\r\n * @return {string} path The final component of a pathname, i.e. everything\r\n *     after the final slash.\r\n */\r\ngoog.string.path.baseName = function(path) {\r\n  var i = path.lastIndexOf('/') + 1;\r\n  return path.slice(i);\r\n};\r\n\r\n\r\n/**\r\n * Alias to goog.string.path.baseName.\r\n * @param {string} path A pathname.\r\n * @return {string} path The final component of a pathname.\r\n * @deprecated Use goog.string.path.baseName.\r\n */\r\ngoog.string.path.basename = goog.string.path.baseName;\r\n\r\n\r\n/**\r\n * Returns the directory component of a pathname.\r\n * See http://docs.python.org/library/os.path.html#os.path.dirname\r\n * @param {string} path A pathname.\r\n * @return {string} The directory component of a pathname, i.e. everything\r\n *     leading up to the final slash.\r\n */\r\ngoog.string.path.dirname = function(path) {\r\n  var i = path.lastIndexOf('/') + 1;\r\n  var head = path.slice(0, i);\r\n  // If the path isn't all forward slashes, trim the trailing slashes.\r\n  if (!/^\\/+$/.test(head)) {\r\n    head = head.replace(/\\/+$/, '');\r\n  }\r\n  return head;\r\n};\r\n\r\n\r\n/**\r\n * Extracts the extension part of a pathname.\r\n * @param {string} path The path name to process.\r\n * @return {string} The extension if any, otherwise the empty string.\r\n */\r\ngoog.string.path.extension = function(path) {\r\n  var separator = '.';\r\n  // Combining all adjacent periods in the basename to a single period.\r\n  var baseName = goog.string.path.baseName(path).replace(/\\.+/g, separator);\r\n  var separatorIndex = baseName.lastIndexOf(separator);\r\n  return separatorIndex <= 0 ? '' : baseName.substr(separatorIndex + 1);\r\n};\r\n\r\n\r\n// TODO(johnlenz): goog.string.path.join should not accept undefined\r\n/**\r\n * Joins one or more path components (e.g. 'foo/' and 'bar' make 'foo/bar').\r\n * An absolute component will discard all previous component.\r\n * See http://docs.python.org/library/os.path.html#os.path.join\r\n * @param {...(string|undefined)} var_args One of more path components.\r\n * @return {string} The path components joined.\r\n */\r\ngoog.string.path.join = function(var_args) {\r\n  var path = arguments[0];\r\n\r\n  for (var i = 1; i < arguments.length; i++) {\r\n    var arg = arguments[i];\r\n    if (goog.string.startsWith(arg, '/')) {\r\n      path = arg;\r\n    } else if (path == '' || goog.string.endsWith(path, '/')) {\r\n      path += arg;\r\n    } else {\r\n      path += '/' + arg;\r\n    }\r\n  }\r\n\r\n  return path;\r\n};\r\n\r\n\r\n/**\r\n * Normalizes a pathname by collapsing duplicate separators, parent directory\r\n * references ('..'), and current directory references ('.').\r\n * See http://docs.python.org/library/os.path.html#os.path.normpath\r\n * @param {string} path One or more path components.\r\n * @return {string} The path after normalization.\r\n */\r\ngoog.string.path.normalizePath = function(path) {\r\n  if (path == '') {\r\n    return '.';\r\n  }\r\n\r\n  var initialSlashes = '';\r\n  // POSIX will keep two slashes, but three or more will be collapsed to one.\r\n  if (goog.string.startsWith(path, '/')) {\r\n    initialSlashes = '/';\r\n    if (goog.string.startsWith(path, '//') &&\r\n        !goog.string.startsWith(path, '///')) {\r\n      initialSlashes = '//';\r\n    }\r\n  }\r\n\r\n  var parts = path.split('/');\r\n  var newParts = [];\r\n\r\n  for (var i = 0; i < parts.length; i++) {\r\n    var part = parts[i];\r\n\r\n    // '' and '.' don't change the directory, ignore.\r\n    if (part == '' || part == '.') {\r\n      continue;\r\n    }\r\n\r\n    // A '..' should pop a directory unless this is not an absolute path and\r\n    // we're at the root, or we've travelled upwards relatively in the last\r\n    // iteration.\r\n    if (part != '..' || (!initialSlashes && !newParts.length) ||\r\n        goog.array.peek(newParts) == '..') {\r\n      newParts.push(part);\r\n    } else {\r\n      newParts.pop();\r\n    }\r\n  }\r\n\r\n  var returnPath = initialSlashes + newParts.join('/');\r\n  return returnPath || '.';\r\n};\r\n\r\n\r\n/**\r\n * Splits a pathname into \"dirname\" and \"baseName\" components, where \"baseName\"\r\n * is everything after the final slash. Either part may return an empty string.\r\n * See http://docs.python.org/library/os.path.html#os.path.split\r\n * @param {string} path A pathname.\r\n * @return {!Array<string>} An array of [dirname, basename].\r\n */\r\ngoog.string.path.split = function(path) {\r\n  var head = goog.string.path.dirname(path);\r\n  var tail = goog.string.path.baseName(path);\r\n  return [head, tail];\r\n};\r\n\r\n// TODO(nnaze): Implement other useful functions from os.path\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Implementation of a WebChannel transport using WebChannelBase.\r\n *\r\n * When WebChannelBase is used as the underlying transport, the capabilities\r\n * of the WebChannel are limited to what's supported by the implementation.\r\n * Particularly, multiplexing is not possible, and only strings are\r\n * supported as message types.\r\n *\r\n */\r\n\r\ngoog.provide('goog.labs.net.webChannel.WebChannelBaseTransport');\r\n\r\ngoog.require('goog.asserts');\r\ngoog.require('goog.events.EventTarget');\r\ngoog.require('goog.json');\r\ngoog.require('goog.labs.net.webChannel.ChannelRequest');\r\ngoog.require('goog.labs.net.webChannel.WebChannelBase');\r\ngoog.require('goog.labs.net.webChannel.Wire');\r\ngoog.require('goog.log');\r\ngoog.require('goog.net.WebChannel');\r\ngoog.require('goog.net.WebChannelTransport');\r\ngoog.require('goog.object');\r\ngoog.require('goog.string');\r\ngoog.require('goog.string.path');\r\n\r\n\r\n\r\n/**\r\n * Implementation of {@link goog.net.WebChannelTransport} with\r\n * {@link goog.labs.net.webChannel.WebChannelBase} as the underlying channel\r\n * implementation.\r\n *\r\n * @constructor\r\n * @struct\r\n * @implements {goog.net.WebChannelTransport}\r\n * @final\r\n */\r\ngoog.labs.net.webChannel.WebChannelBaseTransport = function() {\r\n  if (!goog.labs.net.webChannel.ChannelRequest.supportsXhrStreaming()) {\r\n    throw new Error('Environmental error: no available transport.');\r\n  }\r\n};\r\n\r\n\r\ngoog.scope(function() {\r\nvar WebChannelBaseTransport = goog.labs.net.webChannel.WebChannelBaseTransport;\r\nvar WebChannelBase = goog.labs.net.webChannel.WebChannelBase;\r\nvar Wire = goog.labs.net.webChannel.Wire;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.prototype.createWebChannel = function(\r\n    url, opt_options) {\r\n  return new WebChannelBaseTransport.Channel(url, opt_options);\r\n};\r\n\r\n\r\n\r\n/**\r\n * Implementation of the {@link goog.net.WebChannel} interface.\r\n *\r\n * @param {string} url The URL path for the new WebChannel instance.\r\n * @param {!goog.net.WebChannel.Options=} opt_options Configuration for the\r\n *     new WebChannel instance.\r\n *\r\n * @constructor\r\n * @implements {goog.net.WebChannel}\r\n * @extends {goog.events.EventTarget}\r\n * @final\r\n */\r\nWebChannelBaseTransport.Channel = function(url, opt_options) {\r\n  WebChannelBaseTransport.Channel.base(this, 'constructor');\r\n\r\n  /**\r\n   * @private {!WebChannelBase} The underlying channel object.\r\n   */\r\n  this.channel_ = new WebChannelBase(\r\n      opt_options, goog.net.WebChannelTransport.CLIENT_VERSION);\r\n\r\n  /**\r\n   * @private {string} The URL of the target server end-point.\r\n   */\r\n  this.url_ = url;\r\n\r\n  /**\r\n   * The test URL of the target server end-point. This value defaults to\r\n   * this.url_ + '/test'.\r\n   *\r\n   * @private {string}\r\n   */\r\n  this.testUrl_ = (opt_options && opt_options.testUrl) ?\r\n      opt_options.testUrl :\r\n      goog.string.path.join(this.url_, 'test');\r\n\r\n  /**\r\n   * @private {goog.log.Logger} The logger for this class.\r\n   */\r\n  this.logger_ =\r\n      goog.log.getLogger('goog.labs.net.webChannel.WebChannelBaseTransport');\r\n\r\n  /**\r\n   * @private {Object<string, string>} Extra URL parameters\r\n   * to be added to each HTTP request.\r\n   */\r\n  this.messageUrlParams_ =\r\n      (opt_options && opt_options.messageUrlParams) || null;\r\n\r\n  var messageHeaders = (opt_options && opt_options.messageHeaders) || null;\r\n\r\n  // default is false\r\n  if (opt_options && opt_options.clientProtocolHeaderRequired) {\r\n    if (messageHeaders) {\r\n      goog.object.set(\r\n          messageHeaders, goog.net.WebChannel.X_CLIENT_PROTOCOL,\r\n          goog.net.WebChannel.X_CLIENT_PROTOCOL_WEB_CHANNEL);\r\n    } else {\r\n      messageHeaders = goog.object.create(\r\n          goog.net.WebChannel.X_CLIENT_PROTOCOL,\r\n          goog.net.WebChannel.X_CLIENT_PROTOCOL_WEB_CHANNEL);\r\n    }\r\n  }\r\n\r\n  this.channel_.setExtraHeaders(messageHeaders);\r\n\r\n  var initHeaders = (opt_options && opt_options.initMessageHeaders) || null;\r\n\r\n  if (opt_options && opt_options.messageContentType) {\r\n    if (initHeaders) {\r\n      goog.object.set(\r\n          initHeaders, goog.net.WebChannel.X_WEBCHANNEL_CONTENT_TYPE,\r\n          opt_options.messageContentType);\r\n    } else {\r\n      initHeaders = goog.object.create(\r\n          goog.net.WebChannel.X_WEBCHANNEL_CONTENT_TYPE,\r\n          opt_options.messageContentType);\r\n    }\r\n  }\r\n\r\n  if (opt_options && opt_options.clientProfile) {\r\n    if (initHeaders) {\r\n      goog.object.set(\r\n          initHeaders, goog.net.WebChannel.X_WEBCHANNEL_CLIENT_PROFILE,\r\n          opt_options.clientProfile);\r\n    } else {\r\n      initHeaders = goog.object.create(\r\n          goog.net.WebChannel.X_WEBCHANNEL_CLIENT_PROFILE,\r\n          opt_options.clientProfile);\r\n    }\r\n  }\r\n\r\n  this.channel_.setInitHeaders(initHeaders);\r\n\r\n  var httpHeadersOverwriteParam =\r\n      opt_options && opt_options.httpHeadersOverwriteParam;\r\n  if (httpHeadersOverwriteParam &&\r\n      !goog.string.isEmptyOrWhitespace(httpHeadersOverwriteParam)) {\r\n    this.channel_.setHttpHeadersOverwriteParam(httpHeadersOverwriteParam);\r\n  }\r\n\r\n  /**\r\n   * @private {boolean} Whether to enable CORS.\r\n   */\r\n  this.supportsCrossDomainXhr_ =\r\n      (opt_options && opt_options.supportsCrossDomainXhr) || false;\r\n\r\n  /**\r\n   * @private {boolean} Whether to send raw Json and bypass v8 wire format.\r\n   */\r\n  this.sendRawJson_ = (opt_options && opt_options.sendRawJson) || false;\r\n\r\n  // Note that httpSessionIdParam will be ignored if the same parameter name\r\n  // has already been specified with messageUrlParams\r\n  var httpSessionIdParam = opt_options && opt_options.httpSessionIdParam;\r\n  if (httpSessionIdParam &&\r\n      !goog.string.isEmptyOrWhitespace(httpSessionIdParam)) {\r\n    this.channel_.setHttpSessionIdParam(httpSessionIdParam);\r\n    if (goog.object.containsKey(this.messageUrlParams_, httpSessionIdParam)) {\r\n      goog.object.remove(this.messageUrlParams_, httpSessionIdParam);\r\n      goog.log.warning(this.logger_,\r\n          'Ignore httpSessionIdParam also specified with messageUrlParams: '\r\n          + httpSessionIdParam);\r\n    }\r\n  }\r\n\r\n  /**\r\n   * The channel handler.\r\n   *\r\n   * @private {!WebChannelBaseTransport.Channel.Handler_}\r\n   */\r\n  this.channelHandler_ = new WebChannelBaseTransport.Channel.Handler_(this);\r\n};\r\ngoog.inherits(WebChannelBaseTransport.Channel, goog.events.EventTarget);\r\n\r\n\r\n/**\r\n * @override\r\n * @suppress {checkTypes}\r\n */\r\nWebChannelBaseTransport.Channel.prototype.addEventListener = function(\r\n    type, handler, /** boolean= */ opt_capture, opt_handlerScope) {\r\n  WebChannelBaseTransport.Channel.base(\r\n      this, 'addEventListener', type, handler, opt_capture, opt_handlerScope);\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n * @suppress {checkTypes}\r\n */\r\nWebChannelBaseTransport.Channel.prototype.removeEventListener = function(\r\n    type, handler, /** boolean= */ opt_capture, opt_handlerScope) {\r\n  WebChannelBaseTransport.Channel.base(\r\n      this, 'removeEventListener', type, handler, opt_capture,\r\n      opt_handlerScope);\r\n};\r\n\r\n\r\n/**\r\n * Test path is always set to \"/url/test\".\r\n *\r\n * @override\r\n */\r\nWebChannelBaseTransport.Channel.prototype.open = function() {\r\n  this.channel_.setHandler(this.channelHandler_);\r\n  if (this.supportsCrossDomainXhr_) {\r\n    this.channel_.setSupportsCrossDomainXhrs(true);\r\n  }\r\n  this.channel_.connect(\r\n      this.testUrl_, this.url_, (this.messageUrlParams_ || undefined));\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.Channel.prototype.close = function() {\r\n  this.channel_.disconnect();\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.Channel.prototype.halfClose = function() {\r\n  // to be implemented\r\n  throw new Error('Not implemented');\r\n};\r\n\r\n\r\n/**\r\n * The WebChannelBase only supports object types.\r\n *\r\n * @param {!goog.net.WebChannel.MessageData} message The message to send.\r\n *\r\n * @override\r\n */\r\nWebChannelBaseTransport.Channel.prototype.send = function(message) {\r\n  goog.asserts.assert(\r\n      goog.isObject(message) || goog.isString(message),\r\n      'only object type or raw string is supported');\r\n\r\n  if (goog.isString(message)) {\r\n    var rawJson = {};\r\n    rawJson[Wire.RAW_DATA_KEY] = message;\r\n    this.channel_.sendMap(rawJson);\r\n  } else if (this.sendRawJson_) {\r\n    var rawJson = {};\r\n    rawJson[Wire.RAW_DATA_KEY] = goog.json.serialize(message);\r\n    this.channel_.sendMap(rawJson);\r\n  } else {\r\n    this.channel_.sendMap(message);\r\n  }\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.Channel.prototype.disposeInternal = function() {\r\n  this.channel_.setHandler(null);\r\n  delete this.channelHandler_;\r\n  this.channel_.disconnect();\r\n  delete this.channel_;\r\n\r\n  WebChannelBaseTransport.Channel.base(this, 'disposeInternal');\r\n};\r\n\r\n\r\n\r\n/**\r\n * The message event.\r\n *\r\n * @param {!Array<?>|!Object} array The data array from the underlying channel.\r\n * @constructor\r\n * @extends {goog.net.WebChannel.MessageEvent}\r\n * @final\r\n */\r\nWebChannelBaseTransport.Channel.MessageEvent = function(array) {\r\n  WebChannelBaseTransport.Channel.MessageEvent.base(this, 'constructor');\r\n\r\n  // single-metadata only\r\n  var metadata = array['__sm__'];\r\n  if (metadata) {\r\n    this.metadataKey = goog.object.getAnyKey(metadata);\r\n    if (this.metadataKey) {\r\n      this.data = goog.object.get(metadata, this.metadataKey);\r\n    } else {\r\n      this.data = metadata;  // empty\r\n    }\r\n  } else {\r\n    this.data = array;\r\n  }\r\n};\r\ngoog.inherits(\r\n    WebChannelBaseTransport.Channel.MessageEvent,\r\n    goog.net.WebChannel.MessageEvent);\r\n\r\n\r\n\r\n/**\r\n * The error event.\r\n *\r\n * @param {WebChannelBase.Error} error The error code.\r\n * @constructor\r\n * @extends {goog.net.WebChannel.ErrorEvent}\r\n * @final\r\n */\r\nWebChannelBaseTransport.Channel.ErrorEvent = function(error) {\r\n  WebChannelBaseTransport.Channel.ErrorEvent.base(this, 'constructor');\r\n\r\n  /**\r\n   * High-level status code.\r\n   */\r\n  this.status = goog.net.WebChannel.ErrorStatus.NETWORK_ERROR;\r\n\r\n  /**\r\n   * @const {WebChannelBase.Error} Internal error code, for debugging use only.\r\n   */\r\n  this.errorCode = error;\r\n};\r\ngoog.inherits(\r\n    WebChannelBaseTransport.Channel.ErrorEvent, goog.net.WebChannel.ErrorEvent);\r\n\r\n\r\n\r\n/**\r\n * Implementation of {@link WebChannelBase.Handler} interface.\r\n *\r\n * @param {!WebChannelBaseTransport.Channel} channel The enclosing WebChannel.\r\n *\r\n * @constructor\r\n * @extends {WebChannelBase.Handler}\r\n * @private\r\n */\r\nWebChannelBaseTransport.Channel.Handler_ = function(channel) {\r\n  WebChannelBaseTransport.Channel.Handler_.base(this, 'constructor');\r\n\r\n  /**\r\n   * @type {!WebChannelBaseTransport.Channel}\r\n   * @private\r\n   */\r\n  this.channel_ = channel;\r\n};\r\ngoog.inherits(WebChannelBaseTransport.Channel.Handler_, WebChannelBase.Handler);\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.Channel.Handler_.prototype.channelOpened = function(\r\n    channel) {\r\n  goog.log.info(\r\n      this.channel_.logger_, 'WebChannel opened on ' + this.channel_.url_);\r\n  this.channel_.dispatchEvent(goog.net.WebChannel.EventType.OPEN);\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.Channel.Handler_.prototype.channelHandleArray =\r\n    function(channel, array) {\r\n  goog.asserts.assert(array, 'array expected to be defined');\r\n  this.channel_.dispatchEvent(\r\n      new WebChannelBaseTransport.Channel.MessageEvent(array));\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.Channel.Handler_.prototype.channelError = function(\r\n    channel, error) {\r\n  goog.log.info(\r\n      this.channel_.logger_, 'WebChannel aborted on ' + this.channel_.url_ +\r\n          ' due to channel error: ' + error);\r\n  this.channel_.dispatchEvent(\r\n      new WebChannelBaseTransport.Channel.ErrorEvent(error));\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.Channel.Handler_.prototype.channelClosed = function(\r\n    channel, opt_pendingMaps, opt_undeliveredMaps) {\r\n  goog.log.info(\r\n      this.channel_.logger_, 'WebChannel closed on ' + this.channel_.url_);\r\n  this.channel_.dispatchEvent(goog.net.WebChannel.EventType.CLOSE);\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.Channel.prototype.getRuntimeProperties = function() {\r\n  return new WebChannelBaseTransport.ChannelProperties(this.channel_);\r\n};\r\n\r\n\r\n\r\n/**\r\n * Implementation of the {@link goog.net.WebChannel.RuntimeProperties}.\r\n *\r\n * @param {!WebChannelBase} channel The underlying channel object.\r\n *\r\n * @constructor\r\n * @implements {goog.net.WebChannel.RuntimeProperties}\r\n * @final\r\n */\r\nWebChannelBaseTransport.ChannelProperties = function(channel) {\r\n  /**\r\n   * The underlying channel object.\r\n   *\r\n   * @private {!WebChannelBase}\r\n   */\r\n  this.channel_ = channel;\r\n\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.ChannelProperties.prototype.getConcurrentRequestLimit =\r\n    function() {\r\n  return this.channel_.getForwardChannelRequestPool().getMaxSize();\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.ChannelProperties.prototype.isSpdyEnabled = function() {\r\n  return this.getConcurrentRequestLimit() > 1;\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.ChannelProperties.prototype.getPendingRequestCount =\r\n    function() {\r\n  return this.channel_.getForwardChannelRequestPool().getRequestCount();\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.ChannelProperties.prototype.getHttpSessionId =\r\n    function() {\r\n  return this.channel_.getHttpSessionId();\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.ChannelProperties.prototype.commit = function(\r\n    callback) {\r\n  this.channel_.setForwardChannelFlushCallback(callback);\r\n};\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.ChannelProperties.prototype.getNonAckedMessageCount =\r\n    goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.ChannelProperties.prototype.notifyNonAckedMessageCount =\r\n    goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.ChannelProperties.prototype.onCommit =\r\n    goog.abstractMethod;\r\n\r\n\r\n/**\r\n * @override\r\n */\r\nWebChannelBaseTransport.ChannelProperties.prototype.ackCommit =\r\n    goog.abstractMethod;\r\n\r\n\r\n/** @override */\r\nWebChannelBaseTransport.ChannelProperties.prototype.getLastStatusCode =\r\n    function() {\r\n  return this.channel_.getLastStatusCode();\r\n};\r\n});  // goog.scope\r\n","// Copyright 2013 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Default factory for <code>WebChannelTransport</code> to\r\n * avoid exposing concrete classes to clients.\r\n *\r\n */\r\n\r\ngoog.provide('goog.net.createWebChannelTransport');\r\n\r\ngoog.require('goog.functions');\r\ngoog.require('goog.labs.net.webChannel.WebChannelBaseTransport');\r\n\r\n\r\n/**\r\n * Create a new WebChannelTransport instance using the default implementation.\r\n * Throws an error message if no default transport available in the current\r\n * environment.\r\n *\r\n * @return {!goog.net.WebChannelTransport} the newly created transport instance.\r\n */\r\ngoog.net.createWebChannelTransport =\r\n    /** @type {function(): !goog.net.WebChannelTransport} */ (\r\n        goog.partial(\r\n            goog.functions.create,\r\n            goog.labs.net.webChannel.WebChannelBaseTransport));\r\n","// Copyright 2008 The Closure Library Authors. All Rights Reserved.\r\n//\r\n// Licensed under the Apache License, Version 2.0 (the \"License\");\r\n// you may not use this file except in compliance with the License.\r\n// You may obtain a copy of the License at\r\n//\r\n//      http://www.apache.org/licenses/LICENSE-2.0\r\n//\r\n// Unless required by applicable law or agreed to in writing, software\r\n// distributed under the License is distributed on an \"AS-IS\" BASIS,\r\n// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n// See the License for the specific language governing permissions and\r\n// limitations under the License.\r\n\r\n/**\r\n * @fileoverview Utilities for creating functions. Loosely inspired by these\r\n * java classes from the Guava library:\r\n * com.google.common.base.Functions\r\n * https://google.github.io/guava/releases/snapshot-jre/api/docs/index.html?com/google/common/base/Functions.html\r\n *\r\n * com.google.common.base.Predicates\r\n * https://google.github.io/guava/releases/snapshot-jre/api/docs/index.html?com/google/common/base/Predicates.html\r\n *\r\n * More about these can be found at\r\n * https://github.com/google/guava/wiki/FunctionalExplained\r\n *\r\n * @author nicksantos@google.com (Nick Santos)\r\n */\r\n\r\n\r\ngoog.provide('goog.functions');\r\n\r\n\r\n/**\r\n * Creates a function that always returns the same value.\r\n * @param {T} retValue The value to return.\r\n * @return {function():T} The new function.\r\n * @template T\r\n */\r\ngoog.functions.constant = function(retValue) {\r\n  return function() { return retValue; };\r\n};\r\n\r\n\r\n/**\r\n * Always returns false.\r\n * @type {function(...): boolean}\r\n */\r\ngoog.functions.FALSE = function() {\r\n  return false;\r\n};\r\n\r\n\r\n/**\r\n * Always returns true.\r\n * @type {function(...): boolean}\r\n */\r\ngoog.functions.TRUE = function() {\r\n  return true;\r\n};\r\n\r\n\r\n/**\r\n * Always returns NULL.\r\n * @type {function(...): null}\r\n */\r\ngoog.functions.NULL = function() {\r\n  return null;\r\n};\r\n\r\n\r\n/**\r\n * A simple function that returns the first argument of whatever is passed\r\n * into it.\r\n * @param {T=} opt_returnValue The single value that will be returned.\r\n * @param {...*} var_args Optional trailing arguments. These are ignored.\r\n * @return {T} The first argument passed in, or undefined if nothing was passed.\r\n * @template T\r\n */\r\ngoog.functions.identity = function(opt_returnValue, var_args) {\r\n  return opt_returnValue;\r\n};\r\n\r\n\r\n/**\r\n * Creates a function that always throws an error with the given message.\r\n * @param {string} message The error message.\r\n * @return {!Function} The error-throwing function.\r\n */\r\ngoog.functions.error = function(message) {\r\n  return function() {\r\n    throw new Error(message);\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Creates a function that throws the given object.\r\n * @param {*} err An object to be thrown.\r\n * @return {!Function} The error-throwing function.\r\n */\r\ngoog.functions.fail = function(err) {\r\n  return function() { throw err; };\r\n};\r\n\r\n\r\n/**\r\n * Given a function, create a function that keeps opt_numArgs arguments and\r\n * silently discards all additional arguments.\r\n * @param {Function} f The original function.\r\n * @param {number=} opt_numArgs The number of arguments to keep. Defaults to 0.\r\n * @return {!Function} A version of f that only keeps the first opt_numArgs\r\n *     arguments.\r\n */\r\ngoog.functions.lock = function(f, opt_numArgs) {\r\n  opt_numArgs = opt_numArgs || 0;\r\n  return function() {\r\n    var self = /** @type {*} */ (this);\r\n    return f.apply(self, Array.prototype.slice.call(arguments, 0, opt_numArgs));\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Creates a function that returns its nth argument.\r\n * @param {number} n The position of the return argument.\r\n * @return {!Function} A new function.\r\n */\r\ngoog.functions.nth = function(n) {\r\n  return function() { return arguments[n]; };\r\n};\r\n\r\n\r\n/**\r\n * Like goog.partial(), except that arguments are added after arguments to the\r\n * returned function.\r\n *\r\n * Usage:\r\n * function f(arg1, arg2, arg3, arg4) { ... }\r\n * var g = goog.functions.partialRight(f, arg3, arg4);\r\n * g(arg1, arg2);\r\n *\r\n * @param {!Function} fn A function to partially apply.\r\n * @param {...*} var_args Additional arguments that are partially applied to fn\r\n *     at the end.\r\n * @return {!Function} A partially-applied form of the function goog.partial()\r\n *     was invoked as a method of.\r\n */\r\ngoog.functions.partialRight = function(fn, var_args) {\r\n  var rightArgs = Array.prototype.slice.call(arguments, 1);\r\n  return function() {\r\n    var self = /** @type {*} */ (this);\r\n    var newArgs = Array.prototype.slice.call(arguments);\r\n    newArgs.push.apply(newArgs, rightArgs);\r\n    return fn.apply(self, newArgs);\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Given a function, create a new function that swallows its return value\r\n * and replaces it with a new one.\r\n * @param {Function} f A function.\r\n * @param {T} retValue A new return value.\r\n * @return {function(...?):T} A new function.\r\n * @template T\r\n */\r\ngoog.functions.withReturnValue = function(f, retValue) {\r\n  return goog.functions.sequence(f, goog.functions.constant(retValue));\r\n};\r\n\r\n\r\n/**\r\n * Creates a function that returns whether its argument equals the given value.\r\n *\r\n * Example:\r\n * var key = goog.object.findKey(obj, goog.functions.equalTo('needle'));\r\n *\r\n * @param {*} value The value to compare to.\r\n * @param {boolean=} opt_useLooseComparison Whether to use a loose (==)\r\n *     comparison rather than a strict (===) one. Defaults to false.\r\n * @return {function(*):boolean} The new function.\r\n */\r\ngoog.functions.equalTo = function(value, opt_useLooseComparison) {\r\n  return function(other) {\r\n    return opt_useLooseComparison ? (value == other) : (value === other);\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Creates the composition of the functions passed in.\r\n * For example, (goog.functions.compose(f, g))(a) is equivalent to f(g(a)).\r\n * @param {function(...?):T} fn The final function.\r\n * @param {...Function} var_args A list of functions.\r\n * @return {function(...?):T} The composition of all inputs.\r\n * @template T\r\n */\r\ngoog.functions.compose = function(fn, var_args) {\r\n  var functions = arguments;\r\n  var length = functions.length;\r\n  return function() {\r\n    var self = /** @type {*} */ (this);\r\n    var result;\r\n    if (length) {\r\n      result = functions[length - 1].apply(self, arguments);\r\n    }\r\n\r\n    for (var i = length - 2; i >= 0; i--) {\r\n      result = functions[i].call(self, result);\r\n    }\r\n    return result;\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Creates a function that calls the functions passed in in sequence, and\r\n * returns the value of the last function. For example,\r\n * (goog.functions.sequence(f, g))(x) is equivalent to f(x),g(x).\r\n * @param {...Function} var_args A list of functions.\r\n * @return {!Function} A function that calls all inputs in sequence.\r\n */\r\ngoog.functions.sequence = function(var_args) {\r\n  var functions = arguments;\r\n  var length = functions.length;\r\n  return function() {\r\n    var self = /** @type {*} */ (this);\r\n    var result;\r\n    for (var i = 0; i < length; i++) {\r\n      result = functions[i].apply(self, arguments);\r\n    }\r\n    return result;\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Creates a function that returns true if each of its components evaluates\r\n * to true. The components are evaluated in order, and the evaluation will be\r\n * short-circuited as soon as a function returns false.\r\n * For example, (goog.functions.and(f, g))(x) is equivalent to f(x) && g(x).\r\n * @param {...Function} var_args A list of functions.\r\n * @return {function(...?):boolean} A function that ANDs its component\r\n *      functions.\r\n */\r\ngoog.functions.and = function(var_args) {\r\n  var functions = arguments;\r\n  var length = functions.length;\r\n  return function() {\r\n    var self = /** @type {*} */ (this);\r\n    for (var i = 0; i < length; i++) {\r\n      if (!functions[i].apply(self, arguments)) {\r\n        return false;\r\n      }\r\n    }\r\n    return true;\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Creates a function that returns true if any of its components evaluates\r\n * to true. The components are evaluated in order, and the evaluation will be\r\n * short-circuited as soon as a function returns true.\r\n * For example, (goog.functions.or(f, g))(x) is equivalent to f(x) || g(x).\r\n * @param {...Function} var_args A list of functions.\r\n * @return {function(...?):boolean} A function that ORs its component\r\n *    functions.\r\n */\r\ngoog.functions.or = function(var_args) {\r\n  var functions = arguments;\r\n  var length = functions.length;\r\n  return function() {\r\n    var self = /** @type {*} */ (this);\r\n    for (var i = 0; i < length; i++) {\r\n      if (functions[i].apply(self, arguments)) {\r\n        return true;\r\n      }\r\n    }\r\n    return false;\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Creates a function that returns the Boolean opposite of a provided function.\r\n * For example, (goog.functions.not(f))(x) is equivalent to !f(x).\r\n * @param {!Function} f The original function.\r\n * @return {function(...?):boolean} A function that delegates to f and returns\r\n * opposite.\r\n */\r\ngoog.functions.not = function(f) {\r\n  return function() {\r\n    var self = /** @type {*} */ (this);\r\n    return !f.apply(self, arguments);\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Generic factory function to construct an object given the constructor\r\n * and the arguments. Intended to be bound to create object factories.\r\n *\r\n * Example:\r\n *\r\n * var factory = goog.partial(goog.functions.create, Class);\r\n *\r\n * @param {function(new:T, ...)} constructor The constructor for the Object.\r\n * @param {...*} var_args The arguments to be passed to the constructor.\r\n * @return {T} A new instance of the class given in `constructor`.\r\n * @template T\r\n */\r\ngoog.functions.create = function(constructor, var_args) {\r\n  /**\r\n   * @constructor\r\n   * @final\r\n   */\r\n  var temp = function() {};\r\n  temp.prototype = constructor.prototype;\r\n\r\n  // obj will have constructor's prototype in its chain and\r\n  // 'obj instanceof constructor' will be true.\r\n  var obj = new temp();\r\n\r\n  // obj is initialized by constructor.\r\n  // arguments is only array-like so lacks shift(), but can be used with\r\n  // the Array prototype function.\r\n  constructor.apply(obj, Array.prototype.slice.call(arguments, 1));\r\n  return obj;\r\n};\r\n\r\n\r\n/**\r\n * @define {boolean} Whether the return value cache should be used.\r\n *    This should only be used to disable caches when testing.\r\n */\r\ngoog.functions.CACHE_RETURN_VALUE =\r\n    goog.define('goog.functions.CACHE_RETURN_VALUE', true);\r\n\r\n\r\n/**\r\n * Gives a wrapper function that caches the return value of a parameterless\r\n * function when first called.\r\n *\r\n * When called for the first time, the given function is called and its\r\n * return value is cached (thus this is only appropriate for idempotent\r\n * functions).  Subsequent calls will return the cached return value. This\r\n * allows the evaluation of expensive functions to be delayed until first used.\r\n *\r\n * To cache the return values of functions with parameters, see goog.memoize.\r\n *\r\n * @param {function():T} fn A function to lazily evaluate.\r\n * @return {function():T} A wrapped version the function.\r\n * @template T\r\n */\r\ngoog.functions.cacheReturnValue = function(fn) {\r\n  var called = false;\r\n  var value;\r\n\r\n  return function() {\r\n    if (!goog.functions.CACHE_RETURN_VALUE) {\r\n      return fn();\r\n    }\r\n\r\n    if (!called) {\r\n      value = fn();\r\n      called = true;\r\n    }\r\n\r\n    return value;\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Wraps a function to allow it to be called, at most, once. All\r\n * additional calls are no-ops.\r\n *\r\n * This is particularly useful for initialization functions\r\n * that should be called, at most, once.\r\n *\r\n * @param {function():*} f Function to call.\r\n * @return {function():undefined} Wrapped function.\r\n */\r\ngoog.functions.once = function(f) {\r\n  // Keep a reference to the function that we null out when we're done with\r\n  // it -- that way, the function can be GC'd when we're done with it.\r\n  var inner = f;\r\n  return function() {\r\n    if (inner) {\r\n      var tmp = inner;\r\n      inner = null;\r\n      tmp();\r\n    }\r\n  };\r\n};\r\n\r\n\r\n/**\r\n * Wraps a function to allow it to be called, at most, once per interval\r\n * (specified in milliseconds). If the wrapper function is called N times within\r\n * that interval, only the Nth call will go through.\r\n *\r\n * This is particularly useful for batching up repeated actions where the\r\n * last action should win. This can be used, for example, for refreshing an\r\n * autocomplete pop-up every so often rather than updating with every keystroke,\r\n * since the final text typed by the user is the one that should produce the\r\n * final autocomplete results. For more stateful debouncing with support for\r\n * pausing, resuming, and canceling debounced actions, use\r\n * `goog.async.Debouncer`.\r\n *\r\n * @param {function(this:SCOPE, ...?)} f Function to call.\r\n * @param {number} interval Interval over which to debounce. The function will\r\n *     only be called after the full interval has elapsed since the last call.\r\n * @param {SCOPE=} opt_scope Object in whose scope to call the function.\r\n * @return {function(...?): undefined} Wrapped function.\r\n * @template SCOPE\r\n */\r\ngoog.functions.debounce = function(f, interval, opt_scope) {\r\n  var timeout = 0;\r\n  return /** @type {function(...?)} */ (function(var_args) {\r\n    goog.global.clearTimeout(timeout);\r\n    var args = arguments;\r\n    timeout = goog.global.setTimeout(function() {\r\n      f.apply(opt_scope, args);\r\n    }, interval);\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Wraps a function to allow it to be called, at most, once per interval\r\n * (specified in milliseconds). If the wrapper function is called N times in\r\n * that interval, both the 1st and the Nth calls will go through.\r\n *\r\n * This is particularly useful for limiting repeated user requests where the\r\n * the last action should win, but you also don't want to wait until the end of\r\n * the interval before sending a request out, as it leads to a perception of\r\n * slowness for the user.\r\n *\r\n * @param {function(this:SCOPE, ...?)} f Function to call.\r\n * @param {number} interval Interval over which to throttle. The function can\r\n *     only be called once per interval.\r\n * @param {SCOPE=} opt_scope Object in whose scope to call the function.\r\n * @return {function(...?): undefined} Wrapped function.\r\n * @template SCOPE\r\n */\r\ngoog.functions.throttle = function(f, interval, opt_scope) {\r\n  var timeout = 0;\r\n  var shouldFire = false;\r\n  var args = [];\r\n\r\n  var handleTimeout = function() {\r\n    timeout = 0;\r\n    if (shouldFire) {\r\n      shouldFire = false;\r\n      fire();\r\n    }\r\n  };\r\n\r\n  var fire = function() {\r\n    timeout = goog.global.setTimeout(handleTimeout, interval);\r\n    f.apply(opt_scope, args);\r\n  };\r\n\r\n  return /** @type {function(...?)} */ (function(var_args) {\r\n    args = arguments;\r\n    if (!timeout) {\r\n      fire();\r\n    } else {\r\n      shouldFire = true;\r\n    }\r\n  });\r\n};\r\n\r\n\r\n/**\r\n * Wraps a function to allow it to be called, at most, once per interval\r\n * (specified in milliseconds). If the wrapper function is called N times within\r\n * that interval, only the 1st call will go through.\r\n *\r\n * This is particularly useful for limiting repeated user requests where the\r\n * first request is guaranteed to have all the data required to perform the\r\n * final action, so there's no need to wait until the end of the interval before\r\n * sending the request out.\r\n *\r\n * @param {function(this:SCOPE, ...?)} f Function to call.\r\n * @param {number} interval Interval over which to rate-limit. The function will\r\n *     only be called once per interval, and ignored for the remainer of the\r\n *     interval.\r\n * @param {SCOPE=} opt_scope Object in whose scope to call the function.\r\n * @return {function(...?): undefined} Wrapped function.\r\n * @template SCOPE\r\n */\r\ngoog.functions.rateLimit = function(f, interval, opt_scope) {\r\n  var timeout = 0;\r\n\r\n  var handleTimeout = function() {\r\n    timeout = 0;\r\n  };\r\n\r\n  return /** @type {function(...?)} */ (function(var_args) {\r\n    if (!timeout) {\r\n      timeout = goog.global.setTimeout(handleTimeout, interval);\r\n      f.apply(opt_scope, arguments);\r\n    }\r\n  });\r\n};\r\n","/**\n * @license\n * Copyright 2017 Google Inc.\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * Bring in closure-library dependencies\n */\n\ngoog.provide('firebase.webchannel.wrapper');\n\n// goog.net.WebChannelTransport\ngoog.require('goog.net.createWebChannelTransport');\ngoog.require('goog.labs.net.webChannel.WebChannelBaseTransport');\n/**\n * NOTE: The `createWebChannel` function takes an options object as a second param\n * whose properties are typically mangled. We override these in externs/overrides.js\n * Without those externs, this does not function properly.\n */\ngoog.labs.net.webChannel.WebChannelBaseTransport.prototype['createWebChannel'] =\n  goog.labs.net.webChannel.WebChannelBaseTransport.prototype.createWebChannel;\ngoog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype['send'] =\n  goog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype.send;\ngoog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype['open'] =\n  goog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype.open;\ngoog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype['close'] =\n  goog.labs.net.webChannel.WebChannelBaseTransport.Channel.prototype.close;\n\n// goog.net.ErrorCode\ngoog.require('goog.net.ErrorCode');\ngoog.net.ErrorCode['NO_ERROR'] = goog.net.ErrorCode.NO_ERROR;\ngoog.net.ErrorCode['TIMEOUT'] = goog.net.ErrorCode.TIMEOUT;\ngoog.net.ErrorCode['HTTP_ERROR'] = goog.net.ErrorCode.HTTP_ERROR;\n\n// goog.net.ErrorType\ngoog.require('goog.net.EventType');\ngoog.net.EventType['COMPLETE'] = goog.net.EventType.COMPLETE;\n\n// goog.net.WebChannel\ngoog.require('goog.net.WebChannel');\ngoog.require('goog.events.EventTarget');\ngoog.net.WebChannel['EventType'] = goog.net.WebChannel.EventType;\ngoog.net.WebChannel.EventType['OPEN'] = goog.net.WebChannel.EventType.OPEN;\ngoog.net.WebChannel.EventType['CLOSE'] = goog.net.WebChannel.EventType.CLOSE;\ngoog.net.WebChannel.EventType['ERROR'] = goog.net.WebChannel.EventType.ERROR;\ngoog.net.WebChannel.EventType['MESSAGE'] =\n  goog.net.WebChannel.EventType.MESSAGE;\ngoog.events.EventTarget.prototype['listen'] =\n  goog.events.EventTarget.prototype.listen;\n\n// goog.net.XhrIo\ngoog.require('goog.net.XhrIo');\ngoog.net.XhrIo.prototype['listenOnce'] = goog.net.XhrIo.prototype.listenOnce;\ngoog.net.XhrIo.prototype['getLastError'] =\n  goog.net.XhrIo.prototype.getLastError;\ngoog.net.XhrIo.prototype['getLastErrorCode'] =\n  goog.net.XhrIo.prototype.getLastErrorCode;\ngoog.net.XhrIo.prototype['getStatus'] = goog.net.XhrIo.prototype.getStatus;\ngoog.net.XhrIo.prototype['getResponseJson'] =\n  goog.net.XhrIo.prototype.getResponseJson;\ngoog.net.XhrIo.prototype['getResponseText'] =\n  goog.net.XhrIo.prototype.getResponseText;\ngoog.net.XhrIo.prototype['send'] = goog.net.XhrIo.prototype.send;\n\n/**\n * This ignore statement is required as closure will minify these properties\n * if done in the typical prettier format\n */\n// prettier-ignore\nmodule['exports'] = {\n  'createWebChannelTransport': goog.net.createWebChannelTransport,\n  'ErrorCode': goog.net.ErrorCode,\n  'EventType': goog.net.EventType,\n  'WebChannel': goog.net.WebChannel,\n  'XhrIo': 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