mirror of
https://github.com/musix-org/musix-oss
synced 2024-12-23 16:13:18 +00:00
184 lines
4.1 KiB
JavaScript
184 lines
4.1 KiB
JavaScript
/*
|
|
* extsprintf.js: extended POSIX-style sprintf
|
|
*/
|
|
|
|
var mod_assert = require('assert');
|
|
var mod_util = require('util');
|
|
|
|
/*
|
|
* Public interface
|
|
*/
|
|
exports.sprintf = jsSprintf;
|
|
exports.printf = jsPrintf;
|
|
exports.fprintf = jsFprintf;
|
|
|
|
/*
|
|
* Stripped down version of s[n]printf(3c). We make a best effort to throw an
|
|
* exception when given a format string we don't understand, rather than
|
|
* ignoring it, so that we won't break existing programs if/when we go implement
|
|
* the rest of this.
|
|
*
|
|
* This implementation currently supports specifying
|
|
* - field alignment ('-' flag),
|
|
* - zero-pad ('0' flag)
|
|
* - always show numeric sign ('+' flag),
|
|
* - field width
|
|
* - conversions for strings, decimal integers, and floats (numbers).
|
|
* - argument size specifiers. These are all accepted but ignored, since
|
|
* Javascript has no notion of the physical size of an argument.
|
|
*
|
|
* Everything else is currently unsupported, most notably precision, unsigned
|
|
* numbers, non-decimal numbers, and characters.
|
|
*/
|
|
function jsSprintf(fmt)
|
|
{
|
|
var regex = [
|
|
'([^%]*)', /* normal text */
|
|
'%', /* start of format */
|
|
'([\'\\-+ #0]*?)', /* flags (optional) */
|
|
'([1-9]\\d*)?', /* width (optional) */
|
|
'(\\.([1-9]\\d*))?', /* precision (optional) */
|
|
'[lhjztL]*?', /* length mods (ignored) */
|
|
'([diouxXfFeEgGaAcCsSp%jr])' /* conversion */
|
|
].join('');
|
|
|
|
var re = new RegExp(regex);
|
|
var args = Array.prototype.slice.call(arguments, 1);
|
|
var flags, width, precision, conversion;
|
|
var left, pad, sign, arg, match;
|
|
var ret = '';
|
|
var argn = 1;
|
|
|
|
mod_assert.equal('string', typeof (fmt));
|
|
|
|
while ((match = re.exec(fmt)) !== null) {
|
|
ret += match[1];
|
|
fmt = fmt.substring(match[0].length);
|
|
|
|
flags = match[2] || '';
|
|
width = match[3] || 0;
|
|
precision = match[4] || '';
|
|
conversion = match[6];
|
|
left = false;
|
|
sign = false;
|
|
pad = ' ';
|
|
|
|
if (conversion == '%') {
|
|
ret += '%';
|
|
continue;
|
|
}
|
|
|
|
if (args.length === 0)
|
|
throw (new Error('too few args to sprintf'));
|
|
|
|
arg = args.shift();
|
|
argn++;
|
|
|
|
if (flags.match(/[\' #]/))
|
|
throw (new Error(
|
|
'unsupported flags: ' + flags));
|
|
|
|
if (precision.length > 0)
|
|
throw (new Error(
|
|
'non-zero precision not supported'));
|
|
|
|
if (flags.match(/-/))
|
|
left = true;
|
|
|
|
if (flags.match(/0/))
|
|
pad = '0';
|
|
|
|
if (flags.match(/\+/))
|
|
sign = true;
|
|
|
|
switch (conversion) {
|
|
case 's':
|
|
if (arg === undefined || arg === null)
|
|
throw (new Error('argument ' + argn +
|
|
': attempted to print undefined or null ' +
|
|
'as a string'));
|
|
ret += doPad(pad, width, left, arg.toString());
|
|
break;
|
|
|
|
case 'd':
|
|
arg = Math.floor(arg);
|
|
/*jsl:fallthru*/
|
|
case 'f':
|
|
sign = sign && arg > 0 ? '+' : '';
|
|
ret += sign + doPad(pad, width, left,
|
|
arg.toString());
|
|
break;
|
|
|
|
case 'x':
|
|
ret += doPad(pad, width, left, arg.toString(16));
|
|
break;
|
|
|
|
case 'j': /* non-standard */
|
|
if (width === 0)
|
|
width = 10;
|
|
ret += mod_util.inspect(arg, false, width);
|
|
break;
|
|
|
|
case 'r': /* non-standard */
|
|
ret += dumpException(arg);
|
|
break;
|
|
|
|
default:
|
|
throw (new Error('unsupported conversion: ' +
|
|
conversion));
|
|
}
|
|
}
|
|
|
|
ret += fmt;
|
|
return (ret);
|
|
}
|
|
|
|
function jsPrintf() {
|
|
var args = Array.prototype.slice.call(arguments);
|
|
args.unshift(process.stdout);
|
|
jsFprintf.apply(null, args);
|
|
}
|
|
|
|
function jsFprintf(stream) {
|
|
var args = Array.prototype.slice.call(arguments, 1);
|
|
return (stream.write(jsSprintf.apply(this, args)));
|
|
}
|
|
|
|
function doPad(chr, width, left, str)
|
|
{
|
|
var ret = str;
|
|
|
|
while (ret.length < width) {
|
|
if (left)
|
|
ret += chr;
|
|
else
|
|
ret = chr + ret;
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* This function dumps long stack traces for exceptions having a cause() method.
|
|
* See node-verror for an example.
|
|
*/
|
|
function dumpException(ex)
|
|
{
|
|
var ret;
|
|
|
|
if (!(ex instanceof Error))
|
|
throw (new Error(jsSprintf('invalid type for %%r: %j', ex)));
|
|
|
|
/* Note that V8 prepends "ex.stack" with ex.toString(). */
|
|
ret = 'EXCEPTION: ' + ex.constructor.name + ': ' + ex.stack;
|
|
|
|
if (ex.cause && typeof (ex.cause) === 'function') {
|
|
var cex = ex.cause();
|
|
if (cex) {
|
|
ret += '\nCaused by: ' + dumpException(cex);
|
|
}
|
|
}
|
|
|
|
return (ret);
|
|
}
|