<?php

/*

 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

 * Copyright (C) 2006-2008 Dan Fuhry

 * Javascript compression library - used to compact the client-side Javascript code (all 72KB of it!) to save some bandwidth

 *

 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied

 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.

 *

 * This class was written by Andrea Giammarchi and was downloaded from PHPClasses.org. The information page stated that

 * this class is licensed under the GNU General Public License, the terms of which can be found by reading the file

 * "GPL" included with the Enano package.

 */

/**

 * JavaScriptCompressor class,

 *	removes comments or pack JavaScript source[s] code.

 * ______________________________________________________________

 * JavaScriptCompressor (just 2 public methods)

 *    |

 *    |________ getClean(jsSource:mixed):string

 *    |         	returns one or more JavaScript code without comments,

 *    |         	by default removes some spaces too

 *    |

 *    |________ getPacked(jsSource:mixed):string

 *              	returns one or more JavaScript code packed,

 *	        	using getClean and obfuscating output

 * --------------------------------------------------------------

 * Note about $jsSource input varible:

 * 	this var should be a string (i.e. $jsSource = file_get_contents("myFile.js");)

 *      should be an array of strings (i.e. array(file_get_contents("1.js"), file_get_contents("2.js"), ... ))

 *      should be an array with 1 or 2 keys:

 *      	(i.e. array('code'=>file_get_contents("mySource.js")))

 *              (i.e. array('code'=>file_get_contents("mySource.js"), 'name'=>'mySource'))

 *      ... and should be an array of arrays created with theese rules

 *      array(

 *		file_get_contents("secret.js"),

 *              array('code'=>$anotherJS),

 *              array('code'=>$myJSapplication, 'name'=>'JSApplication V 1.0')

 *      )

 *

 *      The name used on dedicated key, will be write on parsed source header

 * --------------------------------------------------------------

 * Note about returned strings:

 * 	Your browser should wrap very long strings, then don't use

 *      cut and paste from your browser, save output into your database or directly

 *      in a file or print them only inside <script> and </script> tags

 * --------------------------------------------------------------

 * Note about parser performance:

 * 	With pure PHP embed code this class should be slow and not really safe

 *      for your server performance then don't parse JavaScript runtime for each

 *      file you need and create some "parsed" caching system

 *      (at least while i've not created a compiled version of theese class functions).

 *      Here there's a caching system example: http://www.phpclasses.org/browse/package/3158.html

 * --------------------------------------------------------------

 * Note about JavaScript packed compatibility:

 * 	To be sure about compatibility include before every script JSL Library:

 *      http://www.devpro.it/JSL/

 * JSL library add some features for old or buggy browsers, one of

 * those functions is String.replace with function as second argument,

 * used by JavaScript generated packed code to rebuild original code.

 *

 * Remember that KDE 3.5, Safari and IE5 will not work correctly with packed version

 * if you'll not include JSL.

 * --------------------------------------------------------------

 * @Compatibility	>= PHP 4

 * @Author		Andrea Giammarchi

 * @see       http://www.devpro.it/

 * @since	    2006/05/31

 * @since		  2006/08/01 [requires SourceMap.class.php to parse source faster and better (dojo.js.uncompressed.js file (211Kb) successfull cleaned or packed)]

 * @version		0.8

 * Dependencies:

 *      Server: BaseConvert.class.php

 *			Server: SourceMap.class.php

 *			Client: JSL.js (http://www.devpro.it/JSL/)

 * Convertion is supported by every browser with JSL Library (FF 1+ Opera 8+ and IE5.5+ are supported without JSL too)

 * @copyright Dean Edwards for his originally idea [dean.edwards.name] and his JavaScript packer

 */

class JavaScriptCompressor {

	/**

	 * public variables

         * 	stats:string		after every compression has some informations

         *      version:string		version of this class

	 */

	var	$stats = '',

		$version = '0.8';

	/** 'private' variables, any comment sorry */

	var	$__startTime = 0,

		$__sourceLength = 0,

		$__sourceNewLength = 0,

		$__totalSources = 0,

		$__sources = array(),

		$__delimeter = array(),

		$__cleanFinder = array("/(\n|\r)+/", "/( |\t)+/", "/(\n )|( \n)|( \n )/", "/[[:space:]]+(\)|})/", "/(\(|{)[[:space:]]+/", "/[[:space:]]*(;|,|:|<|>|\&|\||\=|\?|\+|\-|\%)[[:space:]]*/", "/\)[[:space:]]+{/", "/}[[:space:]]+\(/"),

		$__cleanReplacer = array("\n", " ", "\n", "\\1", "\\1", "\\1", "){", "}("),

		$__BC = null,

		$__SourceMap = null;

	/**

	 * public constructor

         * 	creates a new BaseConvert class variable (base 36)

	 */

	function __construct() {

		$this->__SourceMap = new SourceMap();

		$this->__BC = new BaseConvert('0123456789abcdefghijklmnopqrstuvwxyz');

		$this->__delimeter = array(

			array('name'=>'doublequote', 'start'=>'"', 'end'=>'"', 'noslash'=>true),

			array('name'=>'singlequote', 'start'=>"'", 'end'=>"'", 'noslash'=>true),

			array('name'=>'singlelinecomment', 'start'=>'//', 'end'=>array("\n", "\r")),

			array('name'=>'multilinecomment', 'start'=>'/*', 'end'=>'*/'),

			array('name'=>'regexp', 'start'=>'/', 'end'=>'/', 'match'=>"/^\/[^\n\r]+\/$/", 'noslash'=>true)

		);

	}

	/**

	 * public method

         * 	getClean(mixed [, bool]):string

         *      compress JavaScript removing comments and somespaces (on by default)

         * @param	mixed		view example and notes on class comments

	 */

	function getClean($jsSource) {

		return $this->__commonInitMethods($jsSource, false);

	}

	/**

	 * public method

         * 	getPacked(mixed):string

         *      compress JavaScript replaceing words and removing comments and some spaces

         * @param	mixed		view example and notes on class comments

	 */

	function getPacked($jsSource) {

		return $this->__commonInitMethods($jsSource, true);

	}

	/** 'private' methods, any comment sorry */

	function __addCleanCode($str) {

		return preg_replace($this->__cleanFinder, $this->__cleanReplacer, trim($str));

	}

	function __addClean(&$arr, &$str, &$start, &$end, $clean) {

		if($clean)

			array_push($arr, $this->__addCleanCode(substr($str, $start, $end - $start)));

		else

			array_push($arr, substr($str, $start, $end - $start));

	}

	function __clean(&$str) {

		$len = strlen($str);

		$type = '';

		$clean = array();

		$map = $this->__SourceMap->getMap($str, $this->__delimeter);

		for($a = 0, $b = 0, $c = count($map); $a < $c; $a++) {

			$type = &$map[$a]['name'];

			switch($type) {

				case 'code':

				case 'regexp':

				case 'doublequote':

				case 'singlequote':

					$this->__addClean($clean, $str, $map[$a]['start'], $map[$a]['end'], ($type === 'code'));

					if($type !== 'regexp')

						array_push($clean, "\n");	

					break;

			}

 		}

		return preg_replace("/(\n)+/", "\n", trim(implode('', $clean)));

	}

	function __commonInitMethods(&$jsSource, $packed) { 

		$header = '';

		$this->__startTime = $this->__getTime();

		$this->__sourceLength = 0;

		$this->__sourceManager($jsSource);

		for($a = 0, $b = $this->__totalSources; $a < $b; $a++)

			$this->__sources[$a]['code'] = $this->__clean($this->__sources[$a]['code']);

		$header = $this->__getHeader();

		for($a = 0, $b = $this->__totalSources; $a < $b; $a++)

			$this->__sources[$a] = &$this->__sources[$a]['code'];

		$this->__sources = implode(';', $this->__sources);

		if($packed)

			$this->__sources = $this->__pack($this->__sources);

		$this->__sourceNewLength = strlen($this->__sources);

		$this->__setStats();

		return $header.$this->__sources;

	}

	function __getHeader() {

		return implode('', array(

			'/* ',$this->__getScriptNames(),'JavaScriptCompressor ',$this->version,' [www.devpro.it], ',

			'thanks to Dean Edwards for idea [dean.edwards.name]',

			" */\r\n"		

		));

	}

	function __getScriptNames() {

		$a = 0;

		$result = array();

		for($b = $this->__totalSources; $a < $b; $a++) {

			if($this->__sources[$a]['name'] !== '')

				array_push($result, $this->__sources[$a]['name']);

		}

		$a = count($result);

		if($a-- > 0)

			$result[$a] .= ' with ';

		return $a < 0 ? '' : implode(', ', $result);

	}

	function __getSize($size, $dec = 2) {

		$toEval = '';

		$type = array('bytes', 'Kb', 'Mb', 'Gb');

		$nsize = $size;

		$times = 0;

		while($nsize > 1024) {

			$nsize = $nsize / 1024;

			$toEval .= '/1024';

			$times++;

		}

		if($times === 0)

			$fSize = $size.' '.$type[$times];

		else {

			eval('$size=($size'.$toEval.');');

			$fSize =  number_format($size, $dec, '.', '').' '.$type[$times];

		}

		return $fSize;

	}

	function __getTime($startTime = null) {

		list($usec, $sec) = explode(' ', microtime());

		$newtime = (float)$usec + (float)$sec;

		if($startTime !== null)

			$newtime = number_format(($newtime - $startTime), 3);

		return $newtime;

	}

	function __pack(&$str) {

		$container = array();

		$str = preg_replace("/(\w+)/e", '$this->__BC->toBase($this->__wordsParser("\\1",$container));', $this->__clean($str));

		$str = str_replace("\n", '\n', addslashes($str));

		return 'eval(function(A,G){return A.replace(/(\\w+)/g,function(a,b){return G[parseInt(b,36)]})}("'.$str.'","'.implode(',', $container).'".split(",")));';

	}

	function __setStats() {

		$this->stats = implode(' ', array(

			$this->__getSize($this->__sourceLength),

			'to',

			$this->__getSize($this->__sourceNewLength),

			'in',

			$this->__getTime($this->__startTime),

			'seconds'

		));

	}

	function __sourceManager(&$jsSource) {

		$b = count($jsSource);

		$this->__sources = array();

		if(is_string($jsSource))

			$this->__sourcePusher($jsSource, '');

		elseif(is_array($jsSource) && $b > 0) {

			if(isset($jsSource['code']))

				$this->__sourcePusher($jsSource['code'], (isset($jsSource['name']) ? $jsSource['name'] : ''));

			else {

				for($a = 0; $a < $b; $a++) {

					if(is_array($jsSource[$a]) && isset($jsSource[$a]['code'], $jsSource[$a]['name']))

						$this->__sourcePusher($jsSource[$a]['code'], trim($jsSource[$a]['name']));

					elseif(is_string($jsSource[$a]))

						$this->__sourcePusher($jsSource[$a], '');

				}

			}

		}

		$this->__totalSources = count($this->__sources);

	}

	function __sourcePusher(&$code, $name) {

		$this->__sourceLength += strlen($code);

		array_push($this->__sources, array('code'=>$code, 'name'=>$name));

	}

	function __wordsParser($str, &$d) {

		if(@is_null($key = array_shift($key = array_keys($d,$str))))

			$key = array_push($d, $str) - 1;

		return $key;

	}

}

/**

 * BaseConvert class,

 *	converts an unsigned base 10 integer to a different base and vice versa.

 * ______________________________________________________________

 * BaseConvert

 *    |

 *    |________ constructor(newBase:string)

 *    |         	uses newBase string var for convertion

 *    |                 [i.e. "0123456789abcdef" for an hex convertion]

 *    |

 *    |________ toBase(unsignedInteger:uint):string

 *    |         	return base value of input

 *    |

 *    |________ fromBase(baseString:string):uint

 *              	return base 10 integer value of base input

 * --------------------------------------------------------------

 * REMEMBER: PHP < 6 doesn't work correctly with integer greater than 2147483647 (2^31 - 1)

 * --------------------------------------------------------------

 * @Compatibility	>= PHP 4

 * @Author		Andrea Giammarchi

 * @Site		http://www.devpro.it/

 * @Date		2006/06/05

 * @Version		1.0

 */

class BaseConvert {

	var	$base, $baseLength;

	function BaseConvert($base) {

		$this->base = &$base;

		$this->baseLength = strlen($base);

	}

	function toBase($num) {

		$module = 0; $result = '';

		while($num) {

			$result = $this->base{($module = $num % $this->baseLength)}.$result;

			$num = (int)(($num - $module) / $this->baseLength);

		}

		return $result !== '' ? $result : $this->base{0};

	}

	function fromBase($str) {

		$pos = 0; $len = strlen($str) - 1; $result = 0;

		while($pos < $len)

			$result += pow($this->baseLength, ($len - $pos)) * strpos($this->base, $str{($pos++)});

		return $len >= 0 ? $result + strpos($this->base, $str{($pos)}) : null;

	}

}

/**

* SourceMap class,

*    reads a generic language source code and returns its map.

* ______________________________________________________________

* The SourceMap goals is to create a map of a generic script/program language.

* The getMap method returns an array/list of arrays/dictionary/objects

* of source map using delimeters variable to map correctly:

*  - multi line comments

*  - single line comments

*  - double quoted strings

*  - single quoted strings

*  - pure code

*  - everything else (for example regexp [/re/] with javascript), just adding a correct delimeter

* --------------------------------------------------------------

* What about the delimeter

*     It's an array/list of arrays/dictionary/obects with some properties to find what you're looking for.

*

* parameters are:

*  - name, the name of the delimeter (i.e. "doublequote")

*  - start, one or mode chars to find as start delimeter (i.e. " for double quoted string)

*  - end, one or mode chars to find as end delimeter (i.e. " for double quoted string) [end should be an array/list too]

*

* optional parameters are:

*  - noslash, if true find the end of the delimeter only if last char is not slashed (i.e. "string\"test" find " after test)

*  - match, if choosed language has regexp, verify if string from start to end matches used regexp (i.e. /^\/[^\n\r]+\/$/ for JavaScript regexp)

*

* If end parameter is an array, match and noslash are not supported (i.e. ["\n", "\r"] for end delimeter of a single line comment)

* --------------------------------------------------------------

* What about SourceMap usage

*     It should be a good solution to create sintax highlighter, parser,

*     verifier or some other source code parsing procedure

* --------------------------------------------------------------

* What about SourceMap performance script/languages

*     I've created different version of this class to test each script/program language performance too.

* Python with or without Psyco is actually the faster parser.

* However with this PHP version this class has mapped "dojo.js.uncompressed.js" file (about 211Kb) in less than 0.5 second.

* Test has been done with embed class and PHP as module, any accelerator was used for this PHP test.

* --------------------------------------------------------------

* @Compatibility    >= PHP 4

* @Author        Andrea Giammarchi

* @Site        http://www.devpro.it/

* @Date        2006/08/01

* @LastMOd        2006/08/01

* @Version        0.1

* @Application        Last version of JavaScriptCompressor class use this one to map source code.

*/

class SourceMap {

    /**

     * public method

         *     getMap(&$source:string, &$delimeters:array):array

     * Maps the source code using $delimeters rules and returns map as an array

         * NOTE: read comments to know more about map and delimeter

         *

         * @param    string        generic source code

         * @param    array        array with nested array with code rules

     */

    function getMap(&$source, &$delimeters) {

        # "unsigned" integer variables

        $sourcePosition = 0;

        $delimetersPosition = 0;

        $findLength = 0;

        $len = 0;

        $tempIndex = 0;

        $sourceLength = strlen($source);

        $delimetersLength = count($delimeters);

        # integer variables

        $tempPosition = -1;

        $endPosition = -1;

        # array variables

        $map = array();

        $tempMap = array();

        $tempDelimeter = array();

        while($sourcePosition < $sourceLength) {

            $endPosition = -1;

            for($delimetersPosition = 0; $delimetersPosition < $delimetersLength; $delimetersPosition++) {

                $tempPosition = strpos($source, $delimeters[$delimetersPosition]['start'], $sourcePosition);

                if($tempPosition !== false && ($tempPosition < $endPosition || $endPosition === -1)) {

                    $endPosition = $tempPosition;

                    $tempIndex = $delimetersPosition;

                }

            }

            if($endPosition !== -1) {

                $sourcePosition = $endPosition;

                $tempDelimeter = &$delimeters[$tempIndex];

                $findLength = strlen($tempDelimeter['start']);

                if(is_array($tempDelimeter['end'])) {

                    $delimetersPosition = 0;

                    $endPosition = -1;

                    for($len = count($tempDelimeter['end']); $delimetersPosition < $len; $delimetersPosition++) {

                        $tempPosition = strpos($source, $tempDelimeter['end'][$delimetersPosition], $sourcePosition + $findLength);

                        if($tempPosition !== false && ($tempPosition < $endPosition || $endPosition === -1)) {

                            $endPosition = $tempPosition;

                            $tempIndex = $delimetersPosition;

                        }    

                    }

                    if($endPosition !== -1)

                        $endPosition = $endPosition + strlen($tempDelimeter['end'][$tempIndex]);

                    else

                        $endPosition = $sourceLength;

                    array_push($map, array('name'=>$tempDelimeter['name'], 'start'=>$sourcePosition, 'end'=>$endPosition));

                    $sourcePosition = $endPosition - 1;

                }

                elseif(isset($tempDelimeter['match'])) {

                    $tempPosition = strpos($source, $tempDelimeter['end'], $sourcePosition + $findLength);

                    $len = strlen($tempDelimeter['end']);

                    if($tempPosition !== false && preg_match($tempDelimeter['match'], substr($source, $sourcePosition, $tempPosition - $sourcePosition + $len))) {

                        $endPosition = isset($tempDelimeter['noslash']) ? $this->__endCharNoSlash($source, $sourcePosition, $tempDelimeter['end'], $sourceLength) : $tempPosition + $len;

                        array_push($map, array('name'=>$tempDelimeter['name'], 'start'=>$sourcePosition, 'end'=>$endPosition));

                        $sourcePosition = $endPosition - 1;

                    }

                }

                else {

                    if(isset($tempDelimeter['noslash']))

                        $endPosition = $this->__endCharNoSlash($source, $sourcePosition, $tempDelimeter['end'], $sourceLength);

                    else {

                        $tempPosition = strpos($source, $tempDelimeter['end'], $sourcePosition + $findLength);

                        if($tempPosition !== false)

                            $endPosition = $tempPosition + strlen($tempDelimeter['end']);

                        else

                            $endPosition = $sourceLength;

                    }

                    array_push($map, array('name'=>$tempDelimeter['name'], 'start'=>$sourcePosition, 'end'=>$endPosition));

                    $sourcePosition = $endPosition - 1;

                }

            }

            else

                $sourcePosition = $sourceLength - 1;

            ++$sourcePosition;

        }

        $len = count($map);

        if($len === 0)

            array_push($tempMap, array('name'=>'code', 'start'=>0, 'end'=>$sourceLength));

        else {

            for($tempIndex = 0; $tempIndex < $len; $tempIndex++) {

                if($tempIndex === 0 && $map[$tempIndex]['start'] > 0)

                    array_push($tempMap, array('name'=>'code', 'start'=>0, 'end'=>$map[$tempIndex]['start']));

                elseif($tempIndex > 0 && $map[$tempIndex]['start'] > $map[$tempIndex-1]['end'])

                    array_push($tempMap, array('name'=>'code', 'start'=>$map[$tempIndex-1]['end'], 'end'=>$map[$tempIndex]['start']));

                array_push($tempMap, array('name'=>$map[$tempIndex]['name'], 'start'=>$map[$tempIndex]['start'], 'end'=>$map[$tempIndex]['end']));

                if($tempIndex + 1 === $len && $map[$tempIndex]['end'] < $sourceLength)

                    array_push($tempMap, array('name'=>'code', 'start'=>$map[$tempIndex]['end'], 'end'=>$sourceLength));

            }

        }

        return $tempMap;

    }

    function __endCharNoSlash(&$source, $position, &$find, &$len) {

        $temp = strlen($find);

        do {

            $position = strpos($source, $find, $position + 1);

        }while($position !== false && !$this->__charNoSlash($source, $position));

        if($position === false) $position = $len - $temp;

        return $position + $temp;

    }

    function __charNoSlash(&$source, &$position) {

        $next = 1; $len = $position - $next;

        while($len > 0 && $source{$len} === '\\') $len = $position - (++$next);

        return (($next - 1) % 2 === 0);

    }

}

/**

 * Wrapper for the JavaScriptCompressor class.

 * @param string Javascript code to compact. If this doesn't contain any newline characters, will be treated as a filename.

 * @param bool If true, aggressively compresses the code. Otherwise, just strips comments and some whitespace.

 * @return string Compressed JS

 */

function perform_js_compress($text_or_file, $aggressive = false)

{

  static $compressor = false;

  if ( !is_object($compressor) )

    $compressor = new JavaScriptCompressor();

  if ( strpos($text_or_file, "\n") )

  {

    $text =& $text_or_file;

  }

  else if ( file_exists($text_or_file) )

  {

    $text = file_get_contents($text_or_file);

  }

  else

  {

    $text =& $text_or_file;

  }

  return ( $aggressive ) ? $compressor->getPacked($text) : $compressor->getClean($text);

}