build.xml - Pack task now using PHP packer.

2 files changed, 761 insertions, 0 deletions

diff --git a/release/build/class.JavaScriptPacker.php b/release/build/class.JavaScriptPacker.php
new file mode 100644
index 000000000..bed971018
--- /dev/null
+++ b/release/build/class.JavaScriptPacker.php
@@ -0,0 +1,741 @@
+<?php
+/* 9 April 2008. version 1.1
+ * 
+ * This is the php version of the Dean Edwards JavaScript's Packer,
+ * Based on :
+ * 
+ * ParseMaster, version 1.0.2 (2005-08-19) Copyright 2005, Dean Edwards
+ * a multi-pattern parser.
+ * KNOWN BUG: erroneous behavior when using escapeChar with a replacement
+ * value that is a function
+ * 
+ * packer, version 2.0.2 (2005-08-19) Copyright 2004-2005, Dean Edwards
+ * 
+ * License: http://creativecommons.org/licenses/LGPL/2.1/
+ * 
+ * Ported to PHP by Nicolas Martin.
+ * 
+ * ----------------------------------------------------------------------
+ * changelog:
+ * 1.1 : correct a bug, '\0' packed then unpacked becomes '\'.
+ * ----------------------------------------------------------------------
+ * 
+ * examples of usage :
+ * $myPacker = new JavaScriptPacker($script, 62, true, false);
+ * $packed = $myPacker->pack();
+ * 
+ * or
+ * 
+ * $myPacker = new JavaScriptPacker($script, 'Normal', true, false);
+ * $packed = $myPacker->pack();
+ * 
+ * or (default values)
+ * 
+ * $myPacker = new JavaScriptPacker($script);
+ * $packed = $myPacker->pack();
+ * 
+ * 
+ * params of the constructor :
+ * $script:       the JavaScript to pack, string.
+ * $encoding:     level of encoding, int or string :
+ *                0,10,62,95 or 'None', 'Numeric', 'Normal', 'High ASCII'.
+ *                default: 62.
+ * $fastDecode:   include the fast decoder in the packed result, boolean.
+ *                default : true.
+ * $specialChars: if you are flagged your private and local variables
+ *                in the script, boolean.
+ *                default: false.
+ * 
+ * The pack() method return the compressed JavasScript, as a string.
+ * 
+ * see http://dean.edwards.name/packer/usage/ for more information.
+ * 
+ * Notes :
+ * # need PHP 5 . Tested with PHP 5.1.2, 5.1.3, 5.1.4, 5.2.3
+ * 
+ * # The packed result may be different than with the Dean Edwards
+ *   version, but with the same length. The reason is that the PHP
+ *   function usort to sort array don't necessarily preserve the
+ *   original order of two equal member. The Javascript sort function
+ *   in fact preserve this order (but that's not require by the
+ *   ECMAScript standard). So the encoded keywords order can be
+ *   different in the two results.
+ * 
+ * # Be careful with the 'High ASCII' Level encoding if you use
+ *   UTF-8 in your files... 
+ */
+
+
+class JavaScriptPacker {
+	// constants
+	const IGNORE = '$1';
+
+	// validate parameters
+	private $_script = '';
+	private $_encoding = 62;
+	private $_fastDecode = true;
+	private $_specialChars = false;
+	
+	private $LITERAL_ENCODING = array(
+		'None' => 0,
+		'Numeric' => 10,
+		'Normal' => 62,
+		'High ASCII' => 95
+	);
+	
+	public function __construct($_script, $_encoding = 62, $_fastDecode = true, $_specialChars = false)
+	{
+		$this->_script = $_script . "\n";
+		if (array_key_exists($_encoding, $this->LITERAL_ENCODING))
+			$_encoding = $this->LITERAL_ENCODING[$_encoding];
+		$this->_encoding = min((int)$_encoding, 95);
+		$this->_fastDecode = $_fastDecode;	
+		$this->_specialChars = $_specialChars;
+	}
+	
+	public function pack() {
+		$this->_addParser('_basicCompression');
+		if ($this->_specialChars)
+			$this->_addParser('_encodeSpecialChars');
+		if ($this->_encoding)
+			$this->_addParser('_encodeKeywords');
+		
+		// go!
+		return $this->_pack($this->_script);
+	}
+	
+	// apply all parsing routines
+	private function _pack($script) {
+		for ($i = 0; isset($this->_parsers[$i]); $i++) {
+			$script = call_user_func(array(&$this,$this->_parsers[$i]), $script);
+		}
+		return $script;
+	}
+	
+	// keep a list of parsing functions, they'll be executed all at once
+	private $_parsers = array();
+	private function _addParser($parser) {
+		$this->_parsers[] = $parser;
+	}
+	
+	// zero encoding - just removal of white space and comments
+	private function _basicCompression($script) {
+		$parser = new ParseMaster();
+		// make safe
+		$parser->escapeChar = '\\';
+		// protect strings
+		$parser->add('/\'[^\'\\n\\r]*\'/', self::IGNORE);
+		$parser->add('/"[^"\\n\\r]*"/', self::IGNORE);
+		// remove comments
+		$parser->add('/\\/\\/[^\\n\\r]*[\\n\\r]/', ' ');
+		$parser->add('/\\/\\*[^*]*\\*+([^\\/][^*]*\\*+)*\\//', ' ');
+		// protect regular expressions
+		$parser->add('/\\s+(\\/[^\\/\\n\\r\\*][^\\/\\n\\r]*\\/g?i?)/', '$2'); // IGNORE
+		$parser->add('/[^\\w\\x24\\/\'"*)\\?:]\\/[^\\/\\n\\r\\*][^\\/\\n\\r]*\\/g?i?/', self::IGNORE);
+		// remove: ;;; doSomething();
+		if ($this->_specialChars) $parser->add('/;;;[^\\n\\r]+[\\n\\r]/');
+		// remove redundant semi-colons
+		$parser->add('/\\(;;\\)/', self::IGNORE); // protect for (;;) loops
+		$parser->add('/;+\\s*([};])/', '$2');
+		// apply the above
+		$script = $parser->exec($script);
+
+		// remove white-space
+		$parser->add('/(\\b|\\x24)\\s+(\\b|\\x24)/', '$2 $3');
+		$parser->add('/([+\\-])\\s+([+\\-])/', '$2 $3');
+		$parser->add('/\\s+/', '');
+		// done
+		return $parser->exec($script);
+	}
+	
+	private function _encodeSpecialChars($script) {
+		$parser = new ParseMaster();
+		// replace: $name -> n, $$name -> na
+		$parser->add('/((\\x24+)([a-zA-Z$_]+))(\\d*)/',
+					 array('fn' => '_replace_name')
+		);
+		// replace: _name -> _0, double-underscore (__name) is ignored
+		$regexp = '/\\b_[A-Za-z\\d]\\w*/';
+		// build the word list
+		$keywords = $this->_analyze($script, $regexp, '_encodePrivate');
+		// quick ref
+		$encoded = $keywords['encoded'];
+		
+		$parser->add($regexp,
+			array(
+				'fn' => '_replace_encoded',
+				'data' => $encoded
+			)
+		);
+		return $parser->exec($script);
+	}
+	
+	private function _encodeKeywords($script) {
+		// escape high-ascii values already in the script (i.e. in strings)
+		if ($this->_encoding > 62)
+			$script = $this->_escape95($script);
+		// create the parser
+		$parser = new ParseMaster();
+		$encode = $this->_getEncoder($this->_encoding);
+		// for high-ascii, don't encode single character low-ascii
+		$regexp = ($this->_encoding > 62) ? '/\\w\\w+/' : '/\\w+/';
+		// build the word list
+		$keywords = $this->_analyze($script, $regexp, $encode);
+		$encoded = $keywords['encoded'];
+		
+		// encode
+		$parser->add($regexp,
+			array(
+				'fn' => '_replace_encoded',
+				'data' => $encoded
+			)
+		);
+		if (empty($script)) return $script;
+		else {
+			//$res = $parser->exec($script);
+			//$res = $this->_bootStrap($res, $keywords);
+			//return $res;
+			return $this->_bootStrap($parser->exec($script), $keywords);
+		}
+	}
+	
+	private function _analyze($script, $regexp, $encode) {
+		// analyse
+		// retreive all words in the script
+		$all = array();
+		preg_match_all($regexp, $script, $all);
+		$_sorted = array(); // list of words sorted by frequency
+		$_encoded = array(); // dictionary of word->encoding
+		$_protected = array(); // instances of "protected" words
+		$all = $all[0]; // simulate the javascript comportement of global match
+		if (!empty($all)) {
+			$unsorted = array(); // same list, not sorted
+			$protected = array(); // "protected" words (dictionary of word->"word")
+			$value = array(); // dictionary of charCode->encoding (eg. 256->ff)
+			$this->_count = array(); // word->count
+			$i = count($all); $j = 0; //$word = null;
+			// count the occurrences - used for sorting later
+			do {
+				--$i;
+				$word = '$' . $all[$i];
+				if (!isset($this->_count[$word])) {
+					$this->_count[$word] = 0;
+					$unsorted[$j] = $word;
+					// make a dictionary of all of the protected words in this script
+					//  these are words that might be mistaken for encoding
+					//if (is_string($encode) && method_exists($this, $encode))
+					$values[$j] = call_user_func(array(&$this, $encode), $j);
+					$protected['$' . $values[$j]] = $j++;
+				}
+				// increment the word counter
+				$this->_count[$word]++;
+			} while ($i > 0);
+			// prepare to sort the word list, first we must protect
+			//  words that are also used as codes. we assign them a code
+			//  equivalent to the word itself.
+			// e.g. if "do" falls within our encoding range
+			//      then we store keywords["do"] = "do";
+			// this avoids problems when decoding
+			$i = count($unsorted);
+			do {
+				$word = $unsorted[--$i];
+				if (isset($protected[$word]) /*!= null*/) {
+					$_sorted[$protected[$word]] = substr($word, 1);
+					$_protected[$protected[$word]] = true;
+					$this->_count[$word] = 0;
+				}
+			} while ($i);
+			
+			// sort the words by frequency
+			// Note: the javascript and php version of sort can be different :
+			// in php manual, usort :
+			// " If two members compare as equal,
+			// their order in the sorted array is undefined."
+			// so the final packed script is different of the Dean's javascript version
+			// but equivalent.
+			// the ECMAscript standard does not guarantee this behaviour,
+			// and thus not all browsers (e.g. Mozilla versions dating back to at
+			// least 2003) respect this. 
+			usort($unsorted, array(&$this, '_sortWords'));
+			$j = 0;
+			// because there are "protected" words in the list
+			//  we must add the sorted words around them
+			do {
+				if (!isset($_sorted[$i]))
+					$_sorted[$i] = substr($unsorted[$j++], 1);
+				$_encoded[$_sorted[$i]] = $values[$i];
+			} while (++$i < count($unsorted));
+		}
+		return array(
+			'sorted'  => $_sorted,
+			'encoded' => $_encoded,
+			'protected' => $_protected);
+	}
+	
+	private $_count = array();
+	private function _sortWords($match1, $match2) {
+		return $this->_count[$match2] - $this->_count[$match1];
+	}
+	
+	// build the boot function used for loading and decoding
+	private function _bootStrap($packed, $keywords) {
+		$ENCODE = $this->_safeRegExp('$encode\\($count\\)');
+
+		// $packed: the packed script
+		$packed = "'" . $this->_escape($packed) . "'";
+
+		// $ascii: base for encoding
+		$ascii = min(count($keywords['sorted']), $this->_encoding);
+		if ($ascii == 0) $ascii = 1;
+
+		// $count: number of words contained in the script
+		$count = count($keywords['sorted']);
+
+		// $keywords: list of words contained in the script
+		foreach ($keywords['protected'] as $i=>$value) {
+			$keywords['sorted'][$i] = '';
+		}
+		// convert from a string to an array
+		ksort($keywords['sorted']);
+		$keywords = "'" . implode('|',$keywords['sorted']) . "'.split('|')";
+
+		$encode = ($this->_encoding > 62) ? '_encode95' : $this->_getEncoder($ascii);
+		$encode = $this->_getJSFunction($encode);
+		$encode = preg_replace('/_encoding/','$ascii', $encode);
+		$encode = preg_replace('/arguments\\.callee/','$encode', $encode);
+		$inline = '\\$count' . ($ascii > 10 ? '.toString(\\$ascii)' : '');
+
+		// $decode: code snippet to speed up decoding
+		if ($this->_fastDecode) {
+			// create the decoder
+			$decode = $this->_getJSFunction('_decodeBody');
+			if ($this->_encoding > 62)
+				$decode = preg_replace('/\\\\w/', '[\\xa1-\\xff]', $decode);
+			// perform the encoding inline for lower ascii values
+			elseif ($ascii < 36)
+				$decode = preg_replace($ENCODE, $inline, $decode);
+			// special case: when $count==0 there are no keywords. I want to keep
+			//  the basic shape of the unpacking funcion so i'll frig the code...
+			if ($count == 0)
+				$decode = preg_replace($this->_safeRegExp('($count)\\s*=\\s*1'), '$1=0', $decode, 1);
+		}
+
+		// boot function
+		$unpack = $this->_getJSFunction('_unpack');
+		if ($this->_fastDecode) {
+			// insert the decoder
+			$this->buffer = $decode;
+			$unpack = preg_replace_callback('/\\{/', array(&$this, '_insertFastDecode'), $unpack, 1);
+		}
+		$unpack = preg_replace('/"/', "'", $unpack);
+		if ($this->_encoding > 62) { // high-ascii
+			// get rid of the word-boundaries for regexp matches
+			$unpack = preg_replace('/\'\\\\\\\\b\'\s*\\+|\\+\s*\'\\\\\\\\b\'/', '', $unpack);
+		}
+		if ($ascii > 36 || $this->_encoding > 62 || $this->_fastDecode) {
+			// insert the encode function
+			$this->buffer = $encode;
+			$unpack = preg_replace_callback('/\\{/', array(&$this, '_insertFastEncode'), $unpack, 1);
+		} else {
+			// perform the encoding inline
+			$unpack = preg_replace($ENCODE, $inline, $unpack);
+		}
+		// pack the boot function too
+		$unpackPacker = new JavaScriptPacker($unpack, 0, false, true);
+		$unpack = $unpackPacker->pack();
+		
+		// arguments
+		$params = array($packed, $ascii, $count, $keywords);
+		if ($this->_fastDecode) {
+			$params[] = 0;
+			$params[] = '{}';
+		}
+		$params = implode(',', $params);
+		
+		// the whole thing
+		return 'eval(' . $unpack . '(' . $params . "))\n";
+	}
+	
+	private $buffer;
+	private function _insertFastDecode($match) {
+		return '{' . $this->buffer . ';';
+	}
+	private function _insertFastEncode($match) {
+		return '{$encode=' . $this->buffer . ';';
+	}
+	
+	// mmm.. ..which one do i need ??
+	private function _getEncoder($ascii) {
+		return $ascii > 10 ? $ascii > 36 ? $ascii > 62 ?
+		       '_encode95' : '_encode62' : '_encode36' : '_encode10';
+	}
+	
+	// zero encoding
+	// characters: 0123456789
+	private function _encode10($charCode) {
+		return $charCode;
+	}
+	
+	// inherent base36 support
+	// characters: 0123456789abcdefghijklmnopqrstuvwxyz
+	private function _encode36($charCode) {
+		return base_convert($charCode, 10, 36);
+	}
+	
+	// hitch a ride on base36 and add the upper case alpha characters
+	// characters: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
+	private function _encode62($charCode) {
+		$res = '';
+		if ($charCode >= $this->_encoding) {
+			$res = $this->_encode62((int)($charCode / $this->_encoding));
+		}
+		$charCode = $charCode % $this->_encoding;
+		
+		if ($charCode > 35)
+			return $res . chr($charCode + 29);
+		else
+			return $res . base_convert($charCode, 10, 36);
+	}
+	
+	// use high-ascii values
+	// characters: ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþ
+	private function _encode95($charCode) {
+		$res = '';
+		if ($charCode >= $this->_encoding)
+			$res = $this->_encode95($charCode / $this->_encoding);
+		
+		return $res . chr(($charCode % $this->_encoding) + 161);
+	}
+	
+	private function _safeRegExp($string) {
+		return '/'.preg_replace('/\$/', '\\\$', $string).'/';
+	}
+	
+	private function _encodePrivate($charCode) {
+		return "_" . $charCode;
+	}
+	
+	// protect characters used by the parser
+	private function _escape($script) {
+		return preg_replace('/([\\\\\'])/', '\\\$1', $script);
+	}
+	
+	// protect high-ascii characters already in the script
+	private function _escape95($script) {
+		return preg_replace_callback(
+			'/[\\xa1-\\xff]/',
+			array(&$this, '_escape95Bis'),
+			$script
+		);
+	}
+	private function _escape95Bis($match) {
+		return '\x'.((string)dechex(ord($match)));
+	}
+	
+	
+	private function _getJSFunction($aName) {
+		if (defined('self::JSFUNCTION'.$aName))
+			return constant('self::JSFUNCTION'.$aName);
+		else 
+			return '';
+	}
+	
+	// JavaScript Functions used.
+	// Note : In Dean's version, these functions are converted
+	// with 'String(aFunctionName);'.
+	// This internal conversion complete the original code, ex :
+	// 'while (aBool) anAction();' is converted to
+	// 'while (aBool) { anAction(); }'.
+	// The JavaScript functions below are corrected.
+	
+	// unpacking function - this is the boot strap function
+	//  data extracted from this packing routine is passed to
+	//  this function when decoded in the target
+	// NOTE ! : without the ';' final.
+	const JSFUNCTION_unpack =
+
+'function($packed, $ascii, $count, $keywords, $encode, $decode) {
+    while ($count--) {
+        if ($keywords[$count]) {
+            $packed = $packed.replace(new RegExp(\'\\\\b\' + $encode($count) + \'\\\\b\', \'g\'), $keywords[$count]);
+        }
+    }
+    return $packed;
+}';
+/*
+'function($packed, $ascii, $count, $keywords, $encode, $decode) {
+    while ($count--)
+        if ($keywords[$count])
+            $packed = $packed.replace(new RegExp(\'\\\\b\' + $encode($count) + \'\\\\b\', \'g\'), $keywords[$count]);
+    return $packed;
+}';
+*/
+	
+	// code-snippet inserted into the unpacker to speed up decoding
+	const JSFUNCTION_decodeBody =
+//_decode = function() {
+// does the browser support String.replace where the
+//  replacement value is a function?
+
+'    if (!\'\'.replace(/^/, String)) {
+        // decode all the values we need
+        while ($count--) {
+            $decode[$encode($count)] = $keywords[$count] || $encode($count);
+        }
+        // global replacement function
+        $keywords = [function ($encoded) {return $decode[$encoded]}];
+        // generic match
+        $encode = function () {return \'\\\\w+\'};
+        // reset the loop counter -  we are now doing a global replace
+        $count = 1;
+    }
+';
+//};
+/*
+'	if (!\'\'.replace(/^/, String)) {
+        // decode all the values we need
+        while ($count--) $decode[$encode($count)] = $keywords[$count] || $encode($count);
+        // global replacement function
+        $keywords = [function ($encoded) {return $decode[$encoded]}];
+        // generic match
+        $encode = function () {return\'\\\\w+\'};
+        // reset the loop counter -  we are now doing a global replace
+        $count = 1;
+    }';
+*/
+	
+	 // zero encoding
+	 // characters: 0123456789
+	 const JSFUNCTION_encode10 =
+'function($charCode) {
+    return $charCode;
+}';//;';
+	
+	 // inherent base36 support
+	 // characters: 0123456789abcdefghijklmnopqrstuvwxyz
+	 const JSFUNCTION_encode36 =
+'function($charCode) {
+    return $charCode.toString(36);
+}';//;';
+	
+	// hitch a ride on base36 and add the upper case alpha characters
+	// characters: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
+	const JSFUNCTION_encode62 =
+'function($charCode) {
+    return ($charCode < _encoding ? \'\' : arguments.callee(parseInt($charCode / _encoding))) +
+    (($charCode = $charCode % _encoding) > 35 ? String.fromCharCode($charCode + 29) : $charCode.toString(36));
+}';
+	
+	// use high-ascii values
+	// characters: ¡¢£¤¥¦§¨©ª«¬­®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþ
+	const JSFUNCTION_encode95 =
+'function($charCode) {
+    return ($charCode < _encoding ? \'\' : arguments.callee($charCode / _encoding)) +
+        String.fromCharCode($charCode % _encoding + 161);
+}'; 
+	
+}
+
+
+class ParseMaster {
+	public $ignoreCase = false;
+	public $escapeChar = '';
+	
+	// constants
+	const EXPRESSION = 0;
+	const REPLACEMENT = 1;
+	const LENGTH = 2;
+	
+	// used to determine nesting levels
+	private $GROUPS = '/\\(/';//g
+	private $SUB_REPLACE = '/\\$\\d/';
+	private $INDEXED = '/^\\$\\d+$/';
+	private $TRIM = '/([\'"])\\1\\.(.*)\\.\\1\\1$/';
+	private $ESCAPE = '/\\\./';//g
+	private $QUOTE = '/\'/';
+	private $DELETED = '/\\x01[^\\x01]*\\x01/';//g
+	
+	public function add($expression, $replacement = '') {
+		// count the number of sub-expressions
+		//  - add one because each pattern is itself a sub-expression
+		$length = 1 + preg_match_all($this->GROUPS, $this->_internalEscape((string)$expression), $out);
+		
+		// treat only strings $replacement
+		if (is_string($replacement)) {
+			// does the pattern deal with sub-expressions?
+			if (preg_match($this->SUB_REPLACE, $replacement)) {
+				// a simple lookup? (e.g. "$2")
+				if (preg_match($this->INDEXED, $replacement)) {
+					// store the index (used for fast retrieval of matched strings)
+					$replacement = (int)(substr($replacement, 1)) - 1;
+				} else { // a complicated lookup (e.g. "Hello $2 $1")
+					// build a function to do the lookup
+					$quote = preg_match($this->QUOTE, $this->_internalEscape($replacement))
+					         ? '"' : "'";
+					$replacement = array(
+						'fn' => '_backReferences',
+						'data' => array(
+							'replacement' => $replacement,
+							'length' => $length,
+							'quote' => $quote
+						)
+					);
+				}
+			}
+		}
+		// pass the modified arguments
+		if (!empty($expression)) $this->_add($expression, $replacement, $length);
+		else $this->_add('/^$/', $replacement, $length);
+	}
+	
+	public function exec($string) {
+		// execute the global replacement
+		$this->_escaped = array();
+		
+		// simulate the _patterns.toSTring of Dean
+		$regexp = '/';
+		foreach ($this->_patterns as $reg) {
+			$regexp .= '(' . substr($reg[self::EXPRESSION], 1, -1) . ')|';
+		}
+		$regexp = substr($regexp, 0, -1) . '/';
+		$regexp .= ($this->ignoreCase) ? 'i' : '';
+		
+		$string = $this->_escape($string, $this->escapeChar);
+		$string = preg_replace_callback(
+			$regexp,
+			array(
+				&$this,
+				'_replacement'
+			),
+			$string
+		);
+		$string = $this->_unescape($string, $this->escapeChar);
+		
+		return preg_replace($this->DELETED, '', $string);
+	}
+		
+	public function reset() {
+		// clear the patterns collection so that this object may be re-used
+		$this->_patterns = array();
+	}
+
+	// private
+	private $_escaped = array();  // escaped characters
+	private $_patterns = array(); // patterns stored by index
+	
+	// create and add a new pattern to the patterns collection
+	private function _add() {
+		$arguments = func_get_args();
+		$this->_patterns[] = $arguments;
+	}
+	
+	// this is the global replace function (it's quite complicated)
+	private function _replacement($arguments) {
+		if (empty($arguments)) return '';
+		
+		$i = 1; $j = 0;
+		// loop through the patterns
+		while (isset($this->_patterns[$j])) {
+			$pattern = $this->_patterns[$j++];
+			// do we have a result?
+			if (isset($arguments[$i]) && ($arguments[$i] != '')) {
+				$replacement = $pattern[self::REPLACEMENT];
+				
+				if (is_array($replacement) && isset($replacement['fn'])) {
+					
+					if (isset($replacement['data'])) $this->buffer = $replacement['data'];
+					return call_user_func(array(&$this, $replacement['fn']), $arguments, $i);
+					
+				} elseif (is_int($replacement)) {
+					return $arguments[$replacement + $i];
+				
+				}
+				$delete = ($this->escapeChar == '' ||
+				           strpos($arguments[$i], $this->escapeChar) === false)
+				        ? '' : "\x01" . $arguments[$i] . "\x01";
+				return $delete . $replacement;
+			
+			// skip over references to sub-expressions
+			} else {
+				$i += $pattern[self::LENGTH];
+			}
+		}
+	}
+	
+	private function _backReferences($match, $offset) {
+		$replacement = $this->buffer['replacement'];
+		$quote = $this->buffer['quote'];
+		$i = $this->buffer['length'];
+		while ($i) {
+			$replacement = str_replace('$'.$i--, $match[$offset + $i], $replacement);
+		}
+		return $replacement;
+	}
+	
+	private function _replace_name($match, $offset){
+		$length = strlen($match[$offset + 2]);
+		$start = $length - max($length - strlen($match[$offset + 3]), 0);
+		return substr($match[$offset + 1], $start, $length) . $match[$offset + 4];
+	}
+	
+	private function _replace_encoded($match, $offset) {
+		return $this->buffer[$match[$offset]];
+	}
+	
+	
+	// php : we cannot pass additional data to preg_replace_callback,
+	// and we cannot use &$this in create_function, so let's go to lower level
+	private $buffer;
+	
+	// encode escaped characters
+	private function _escape($string, $escapeChar) {
+		if ($escapeChar) {
+			$this->buffer = $escapeChar;
+			return preg_replace_callback(
+				'/\\' . $escapeChar . '(.)' .'/',
+				array(&$this, '_escapeBis'),
+				$string
+			);
+			
+		} else {
+			return $string;
+		}
+	}
+	private function _escapeBis($match) {
+		$this->_escaped[] = $match[1];
+		return $this->buffer;
+	}
+	
+	// decode escaped characters
+	private function _unescape($string, $escapeChar) {
+		if ($escapeChar) {
+			$regexp = '/'.'\\'.$escapeChar.'/';
+			$this->buffer = array('escapeChar'=> $escapeChar, 'i' => 0);
+			return preg_replace_callback
+			(
+				$regexp,
+				array(&$this, '_unescapeBis'),
+				$string
+			);
+			
+		} else {
+			return $string;
+		}
+	}
+	private function _unescapeBis() {
+		if (isset($this->_escaped[$this->buffer['i']])
+			&& $this->_escaped[$this->buffer['i']] != '')
+		{
+			 $temp = $this->_escaped[$this->buffer['i']];
+		} else {
+			$temp = '';
+		}
+		$this->buffer['i']++;
+		return $this->buffer['escapeChar'] . $temp;
+	}
+	
+	private function _internalEscape($string) {
+		return preg_replace($this->ESCAPE, '', $string);
+	}
+}
+?>
diff --git a/release/build/pack.php b/release/build/pack.php
new file mode 100644
index 000000000..1caa60a5f
--- /dev/null
+++ b/release/build/pack.php
@@ -0,0 +1,20 @@
+<?php
+
+if ($argc >= 3) {
+	$src = $argv[1];
+	$out = $argv[2];
+} else {
+	echo 'you must specify  a source file and a result filename',"\n";
+	echo 'example :', "\n", 'php pack.php myScript-src.js myPackedScript.js',"\n";
+	return;
+}
+
+require 'class.JavaScriptPacker.php';
+
+$script = file_get_contents($src);
+
+$packer = new JavaScriptPacker($script, 'Normal', true, false);
+$packed = $packer->pack();
+
+file_put_contents($out, $packed);
+?>