PHP code used to automatically compress js files

    /* 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' => $encoded
                )
            );
            if (emptyempty($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 = $all[0]; // simulate the javascript comportement of global match
            if (!emptyempty($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??-?ˉ°±23′μ?·?1o?????àá??????èéê?ìí??D?òó???×?ùú?üYT?àáa?????èéê?ìí??e?òó???÷?ùú?üyt
        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??-?ˉ°±23′μ?·?1o?????àá??????èéê?ìí??D?òó???×?ùú?üYT?àáa?????èéê?ìí??e?òó???÷?ùú?üyt
        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' => $quote
                            )
                        );
                    }
                }
            }
            // pass the modified arguments
            if (!emptyempty($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($arguments) {
            if (emptyempty($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);
        }
    }
    ?>

2、执行压缩的PHP文件 pack_js_file.php

    require 'tom-class.JavaScriptPacker.php';
    $t1 = microtime(true);
    $source_dir = realpath(dirname(__FILE__)."/..")."/common/script_unpacked";
    $out_dir = realpath(dirname(__FILE__)."/..")."/common/script";
    $d = dir( $source_dir );
    //echo "Handle: " . $d->handle . "/n";
    //echo "Path: " . $d->path . "/n";
    while (false !== ($entry = $d->read())) {
        if($entry=='.') continue;
        if($entry=='..') continue;
        if($entry=='.svn') continue;
        echo $entry."/n";
        $script = file_get_contents($source_dir. '/'. $entry);
        $packer = new JavaScriptPacker($script, 'Normal', true, false);
        $packed = $packer->pack();
        file_put_contents($out_dir. '/'. $entry, $packed);
    }
    $d->close();
    $t2 = microtime(true);
    $time = sprintf('%.4f', ($t2 - $t1) );
    echo 'script in ', $time, ' s.', "/n";
    die;
?>

3、创建一个自动执行的bat文件。 在文件中输入如下的内容： /usr/local/php/bin/php pack_js_file.php

总结： 只要填好相对路径或者绝对路径，一键加密JS完成，那是相当的方便！！