mirror of
https://github.com/musix-org/musix-oss
synced 2024-12-24 01:43:18 +00:00
62 lines
2.0 KiB
JavaScript
62 lines
2.0 KiB
JavaScript
|
'use strict';
|
||
|
var path = require('../internals/path');
|
||
|
var aFunction = require('../internals/a-function');
|
||
|
var anObject = require('../internals/an-object');
|
||
|
var create = require('../internals/object-create');
|
||
|
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
|
||
|
var redefineAll = require('../internals/redefine-all');
|
||
|
var wellKnownSymbol = require('../internals/well-known-symbol');
|
||
|
var InternalStateModule = require('../internals/internal-state');
|
||
|
var getBuiltIn = require('../internals/get-built-in');
|
||
|
|
||
|
var Promise = getBuiltIn('Promise');
|
||
|
|
||
|
var setInternalState = InternalStateModule.set;
|
||
|
var getInternalState = InternalStateModule.get;
|
||
|
|
||
|
var TO_STRING_TAG = wellKnownSymbol('toStringTag');
|
||
|
|
||
|
var $return = function (value) {
|
||
|
var iterator = getInternalState(this).iterator;
|
||
|
var $$return = iterator['return'];
|
||
|
return $$return === undefined
|
||
|
? Promise.resolve({ done: true, value: value })
|
||
|
: anObject($$return.call(iterator, value));
|
||
|
};
|
||
|
|
||
|
var $throw = function (value) {
|
||
|
var iterator = getInternalState(this).iterator;
|
||
|
var $$throw = iterator['throw'];
|
||
|
return $$throw === undefined
|
||
|
? Promise.reject(value)
|
||
|
: $$throw.call(iterator, value);
|
||
|
};
|
||
|
|
||
|
module.exports = function (nextHandler, IS_ITERATOR) {
|
||
|
var AsyncIteratorProxy = function AsyncIterator(state) {
|
||
|
state.next = aFunction(state.iterator.next);
|
||
|
state.done = false;
|
||
|
setInternalState(this, state);
|
||
|
};
|
||
|
|
||
|
AsyncIteratorProxy.prototype = redefineAll(create(path.AsyncIterator.prototype), {
|
||
|
next: function next(arg) {
|
||
|
var state = getInternalState(this);
|
||
|
if (state.done) return Promise.resolve({ done: true, value: undefined });
|
||
|
try {
|
||
|
return Promise.resolve(anObject(nextHandler.call(state, arg, Promise)));
|
||
|
} catch (error) {
|
||
|
return Promise.reject(error);
|
||
|
}
|
||
|
},
|
||
|
'return': $return,
|
||
|
'throw': $throw
|
||
|
});
|
||
|
|
||
|
if (!IS_ITERATOR) {
|
||
|
createNonEnumerableProperty(AsyncIteratorProxy.prototype, TO_STRING_TAG, 'Generator');
|
||
|
}
|
||
|
|
||
|
return AsyncIteratorProxy;
|
||
|
};
|