split-fix.js

//----------------------------------------------------------------------------------------------
/*
	Cross-Browser Split 0.3
	By Steven Levithan <http://stevenlevithan.com>
	MIT license
	Provides a consistent cross-browser, ECMA-262 v3 compliant split method
*/
String.prototype._$$split = String.prototype._$$split || String.prototype.split;
String.prototype.split = function (s /* separator */, limit) {
	// if separator is not a regex, use the native split method
	if (!(s instanceof RegExp))
		return String.prototype._$$split.apply(this, arguments);

	var	flags = (s.global ? "g" : "") + (s.ignoreCase ? "i" : "") + (s.multiline ? "m" : ""),
		s2 = new RegExp("^" + s.source + "$", flags),
		output = [],
		origLastIndex = s.lastIndex,
		lastLastIndex = 0,
		i = 0, match, lastLength;

	/* behavior for limit: if it's...
	- undefined: no limit
	- NaN or zero: return an empty array
	- a positive number: use limit after dropping any decimal
	- a negative number: no limit
	- other: type-convert, then use the above rules
	*/
	if (limit === undefined || +limit < 0) {
		limit = false;
	} else {
		limit = Math.floor(+limit);
		if (!limit)
			return [];
	}

	if (s.global)
		s.lastIndex = 0;
	else
		s = new RegExp(s.source, "g" + flags);

	while ((!limit || i++ <= limit) && (match = s.exec(this))) {
		var emptyMatch = !match[0].length;

		// Fix IE's infinite-loop-resistant but incorrect lastIndex
		if (emptyMatch && s.lastIndex > match.index)
			s.lastIndex--;

		if (s.lastIndex > lastLastIndex) {
			// Fix browsers whose exec methods don't consistently return undefined for non-participating capturing groups
			if (match.length > 1) {
				match[0].replace(s2, function () {
					for (var j = 1; j < arguments.length - 2; j++) {
						if (arguments[j] === undefined)
							match[j] = undefined;
					}
				});
			}

			output = output.concat(this.slice(lastLastIndex, match.index));
			if (1 < match.length && match.index < this.length)
				output = output.concat(match.slice(1));
			lastLength = match[0].length; // only needed if s.lastIndex === this.length
			lastLastIndex = s.lastIndex;
		}

		if (emptyMatch)
			s.lastIndex++; // avoid an infinite loop
	}

	// since this uses test(), output must be generated before restoring lastIndex
	output = lastLastIndex === this.length ?
		(s.test("") && !lastLength ? output : output.concat("")) :
		(limit ? output : output.concat(this.slice(lastLastIndex)));
	s.lastIndex = origLastIndex; // only needed if s.global, else we're working with a copy of the regex
	return output;
};
//----------------------------------------------------------------------------------------------