jsShrink.php
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jsShrink.php
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	<?php
	/** Remove spaces and comments from JavaScript code
	* @param string code with commands terminated by semicolon
	* @return string shrinked code
	* @link http://vrana.github.com/JsShrink/
	* @author Jakub Vrana, http://www.vrana.cz/
	* @copyright 2007 Jakub Vrana
	* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
	* @license http://www.gnu.org/licenses/gpl-2.0.html GNU General Public License, version 2 (one or other)
	*/
	function jsShrink($input) {
	return preg_replace_callback('(
	(?:
	(^\|[-+\([{}=,:;!%^&\|?~]\|/(?![/])\|return\|throw) # context before regexp
	(?:\s\|//[^\n]+\n\|/\(?:[^]\|\(?!/))+\/)* # optional space
	(/(?![/*])(?:
	\\\\[^\n]
	\|[^[\n/\\\\]++
	\|\[(?:\\\\[^\n]\|[^]])++
	)+/) # regexp
	\|(^
	\|\'(?:\\\\.\|[^\n\'\\\\])*\'
	\|"(?:\\\\.\|[^\n"\\\\])*"
	\|([0-9A-Za-z_$]+)
	\|([-+]+)
	\|.
	)
	)(?:\s\|//[^\n]+\n\|/\(?:[^]\|\(?!/))+\/)* # optional space
	)sx', 'jsShrinkCallback', "$input\n");
	}

	function jsShrinkCallback($match) {
	static $last = '';
	$match += array_fill(1, 5, null); // avoid E_NOTICE
	list(, $context, $regexp, $result, $word, $operator) = $match;
	if ($word != '') {
	$result = ($last == 'word' ? "\n" : ($last == 'return' ? " " : "")) . $result;
	$last = ($word == 'return' \|\| $word == 'throw' \|\| $word == 'break' ? 'return' : 'word');
	} elseif ($operator) {
	$result = ($last == $operator[0] ? "\n" : "") . $result;
	$last = $operator[0];
	} else {
	if ($regexp) {
	$result = $context . ($context == '/' ? "\n" : "") . $regexp;
	}
	$last = '';
	}
	return $result;
	}