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<?php | 
				
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/** | 
				
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 * xajaxCompress.php :: function to compress Javascript | 
				
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 * | 
				
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 * xajax version 0.2.4 | 
				
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 * copyright (c) 2005 by Jared White & J. Max Wilson | 
				
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 * http://www.xajaxproject.org | 
				
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 * | 
				
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 * xajax is an open source PHP class library for easily creating powerful | 
				
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 * PHP-driven, web-based Ajax Applications. Using xajax, you can asynchronously | 
				
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 * call PHP functions and update the content of your your webpage without | 
				
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 * reloading the page. | 
				
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 * | 
				
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 * xajax is released under the terms of the LGPL license | 
				
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 * http://www.gnu.org/copyleft/lesser.html#SEC3 | 
				
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 * | 
				
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 * This library is free software; you can redistribute it and/or | 
				
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 * modify it under the terms of the GNU Lesser General Public | 
				
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 * License as published by the Free Software Foundation; either | 
				
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 * version 2.1 of the License, or (at your option) any later version. | 
				
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 * | 
				
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 * This library is distributed in the hope that it will be useful, | 
				
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of | 
				
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU | 
				
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 * Lesser General Public License for more details. | 
				
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 * | 
				
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 * You should have received a copy of the GNU Lesser General Public | 
				
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 * License along with this library; if not, write to the Free Software | 
				
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 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA | 
				
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 * | 
				
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 * @package chamilo.include.xajax | 
				
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 * @version $Id: xajaxCompress.php,v 1.1 2006/07/21 15:29:46 elixir_inter Exp $ | 
				
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 * @copyright Copyright (c) 2005-2006  by Jared White & J. Max Wilson | 
				
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 * @license http://www.gnu.org/copyleft/lesser.html#SEC3 LGPL License | 
				
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 */ | 
				
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 | 
				
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/** | 
				
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 * Compresses the Javascript code for more efficient delivery. | 
				
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 * (used internally) | 
				
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 * | 
				
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 * @param string contains the Javascript code to compress | 
				
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 */ | 
				
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function xajaxCompressJavascript($sJS) | 
				
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{ | 
				
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	//remove windows cariage returns | 
				
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	$sJS = str_replace("\r","",$sJS); | 
				
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 | 
				
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	//array to store replaced literal strings | 
				
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	$literal_strings = array(); | 
				
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 | 
				
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	//explode the string into lines | 
				
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	$lines = explode("\n",$sJS); | 
				
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	//loop through all the lines, building a new string at the same time as removing literal strings | 
				
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	$clean = ""; | 
				
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	$inComment = false; | 
				
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	$literal = ""; | 
				
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	$inQuote = false; | 
				
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	$escaped = false; | 
				
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	$quoteChar = ""; | 
				
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 | 
				
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	for($i=0;$i<count($lines);$i++) | 
				
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	{ | 
				
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		$line = $lines[$i]; | 
				
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		$inNormalComment = false; | 
				
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 | 
				
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		//loop through line's characters and take out any literal strings, replace them with ___i___ where i is the index of this string | 
				
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		for($j=0;$j<strlen($line);$j++) | 
				
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		{ | 
				
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			$c = substr($line,$j,1); | 
				
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			$d = substr($line,$j,2); | 
				
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 | 
				
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			//look for start of quote | 
				
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			if(!$inQuote && !$inComment) | 
				
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			{ | 
				
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				//is this character a quote or a comment | 
				
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				if(($c=="\"" || $c=="'") && !$inComment && !$inNormalComment) | 
				
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				{ | 
				
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					$inQuote = true; | 
				
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					$inComment = false; | 
				
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					$escaped = false; | 
				
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					$quoteChar = $c; | 
				
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					$literal = $c; | 
				
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				} | 
				
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				else if($d=="/*" && !$inNormalComment) | 
				
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				{ | 
				
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					$inQuote = false; | 
				
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					$inComment = true; | 
				
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					$escaped = false; | 
				
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					$quoteChar = $d; | 
				
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					$literal = $d; | 
				
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					$j++; | 
				
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				} | 
				
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				else if($d=="//") //ignore string markers that are found inside comments | 
				
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				{ | 
				
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					$inNormalComment = true; | 
				
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					$clean .= $c; | 
				
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				} | 
				
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				else | 
				
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				{ | 
				
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					$clean .= $c; | 
				
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				} | 
				
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			} | 
				
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			else //allready in a string so find end quote | 
				
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			{ | 
				
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				if($c == $quoteChar && !$escaped && !$inComment) | 
				
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				{ | 
				
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					$inQuote = false; | 
				
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					$literal .= $c; | 
				
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 | 
				
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					//subsitute in a marker for the string | 
				
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					$clean .= "___" . count($literal_strings) . "___"; | 
				
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 | 
				
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					//push the string onto our array | 
				
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					array_push($literal_strings,$literal); | 
				
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 | 
				
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				} | 
				
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				else if($inComment && $d=="*/") | 
				
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				{ | 
				
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					$inComment = false; | 
				
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					$literal .= $d; | 
				
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 | 
				
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					//subsitute in a marker for the string | 
				
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					$clean .= "___" . count($literal_strings) . "___"; | 
				
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 | 
				
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					//push the string onto our array | 
				
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					array_push($literal_strings,$literal); | 
				
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 | 
				
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					$j++; | 
				
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				} | 
				
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				else if($c == "\\" && !$escaped) | 
				
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					$escaped = true; | 
				
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				else | 
				
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					$escaped = false; | 
				
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 | 
				
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				$literal .= $c; | 
				
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			} | 
				
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		} | 
				
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		if($inComment) $literal .= "\n"; | 
				
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		$clean .= "\n"; | 
				
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	} | 
				
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	//explode the clean string into lines again | 
				
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	$lines = explode("\n",$clean); | 
				
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 | 
				
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	//now process each line at a time | 
				
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	for($i=0;$i<count($lines);$i++) | 
				
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	{ | 
				
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		$line = $lines[$i]; | 
				
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 | 
				
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		//remove comments | 
				
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		$line = preg_replace("/\/\/(.*)/","",$line); | 
				
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 | 
				
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		//strip leading and trailing whitespace | 
				
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		$line = trim($line); | 
				
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 | 
				
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		//remove all whitespace with a single space | 
				
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		$line = preg_replace("/\s+/"," ",$line); | 
				
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 | 
				
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		//remove any whitespace that occurs after/before an operator | 
				
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		$line = preg_replace("/\s*([!\}\{;,&=\|\-\+\*\/\)\(:])\s*/","\\1",$line); | 
				
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 | 
				
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		$lines[$i] = $line; | 
				
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	} | 
				
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 | 
				
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	//implode the lines | 
				
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	$sJS = implode("\n",$lines); | 
				
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 | 
				
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	//make sure there is a max of 1 \n after each line | 
				
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	$sJS = preg_replace("/[\n]+/","\n",$sJS); | 
				
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 | 
				
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	//strip out line breaks that immediately follow a semi-colon | 
				
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	$sJS = preg_replace("/;\n/",";",$sJS); | 
				
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 | 
				
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	//curly brackets aren't on their own | 
				
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	$sJS = preg_replace("/[\n]*\{[\n]*/","{",$sJS); | 
				
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 | 
				
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	//finally loop through and replace all the literal strings: | 
				
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	for($i=0;$i<count($literal_strings);$i++) | 
				
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		$sJS = str_replace("___".$i."___",$literal_strings[$i],$sJS); | 
				
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 | 
				
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	return $sJS; | 
				
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} | 
				
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?> | 
				
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