mirror of
https://github.com/overleaf/overleaf.git
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113 lines
4.4 KiB
JavaScript
Executable file
113 lines
4.4 KiB
JavaScript
Executable file
/*
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* Based on code from:
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*
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* XRegExp 1.5.0
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* (c) 2007-2010 Steven Levithan
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* MIT License
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* <http://xregexp.com>
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* Provides an augmented, extensible, cross-browser implementation of regular expressions,
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* including support for additional syntax, flags, and methods
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*/
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define(function(require, exports, module) {
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"use strict";
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//---------------------------------
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// Private variables
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//---------------------------------
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var real = {
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exec: RegExp.prototype.exec,
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test: RegExp.prototype.test,
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match: String.prototype.match,
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replace: String.prototype.replace,
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split: String.prototype.split
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},
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compliantExecNpcg = real.exec.call(/()??/, "")[1] === undefined, // check `exec` handling of nonparticipating capturing groups
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compliantLastIndexIncrement = function () {
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var x = /^/g;
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real.test.call(x, "");
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return !x.lastIndex;
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}();
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if (compliantLastIndexIncrement && compliantExecNpcg)
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return;
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//---------------------------------
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// Overriden native methods
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//---------------------------------
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// Adds named capture support (with backreferences returned as `result.name`), and fixes two
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// cross-browser issues per ES3:
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// - Captured values for nonparticipating capturing groups should be returned as `undefined`,
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// rather than the empty string.
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// - `lastIndex` should not be incremented after zero-length matches.
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RegExp.prototype.exec = function (str) {
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var match = real.exec.apply(this, arguments),
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name, r2;
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if ( typeof(str) == 'string' && match) {
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// Fix browsers whose `exec` methods don't consistently return `undefined` for
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// nonparticipating capturing groups
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if (!compliantExecNpcg && match.length > 1 && indexOf(match, "") > -1) {
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r2 = RegExp(this.source, real.replace.call(getNativeFlags(this), "g", ""));
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// Using `str.slice(match.index)` rather than `match[0]` in case lookahead allowed
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// matching due to characters outside the match
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real.replace.call(str.slice(match.index), r2, function () {
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for (var i = 1; i < arguments.length - 2; i++) {
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if (arguments[i] === undefined)
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match[i] = undefined;
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}
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});
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}
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// Attach named capture properties
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if (this._xregexp && this._xregexp.captureNames) {
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for (var i = 1; i < match.length; i++) {
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name = this._xregexp.captureNames[i - 1];
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if (name)
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match[name] = match[i];
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}
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}
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// Fix browsers that increment `lastIndex` after zero-length matches
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if (!compliantLastIndexIncrement && this.global && !match[0].length && (this.lastIndex > match.index))
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this.lastIndex--;
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}
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return match;
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};
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// Don't override `test` if it won't change anything
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if (!compliantLastIndexIncrement) {
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// Fix browser bug in native method
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RegExp.prototype.test = function (str) {
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// Use the native `exec` to skip some processing overhead, even though the overriden
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// `exec` would take care of the `lastIndex` fix
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var match = real.exec.call(this, str);
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// Fix browsers that increment `lastIndex` after zero-length matches
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if (match && this.global && !match[0].length && (this.lastIndex > match.index))
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this.lastIndex--;
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return !!match;
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};
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}
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//---------------------------------
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// Private helper functions
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//---------------------------------
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function getNativeFlags (regex) {
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return (regex.global ? "g" : "") +
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(regex.ignoreCase ? "i" : "") +
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(regex.multiline ? "m" : "") +
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(regex.extended ? "x" : "") + // Proposed for ES4; included in AS3
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(regex.sticky ? "y" : "");
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}
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function indexOf (array, item, from) {
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if (Array.prototype.indexOf) // Use the native array method if available
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return array.indexOf(item, from);
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for (var i = from || 0; i < array.length; i++) {
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if (array[i] === item)
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return i;
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}
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return -1;
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}
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});
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