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   1  <?php
   2  /**
   3   * xajaxCompress.php :: function to compress Javascript
   4   *
   5   * xajax version 0.2.4
   6   * copyright (c) 2005 by Jared White & J. Max Wilson
   7   * http://www.xajaxproject.org
   8   *
   9   * xajax is an open source PHP class library for easily creating powerful
  10   * PHP-driven, web-based Ajax Applications. Using xajax, you can asynchronously
  11   * call PHP functions and update the content of your your webpage without
  12   * reloading the page.
  13   *
  14   * xajax is released under the terms of the LGPL license
  15   * http://www.gnu.org/copyleft/lesser.html#SEC3
  16   *
  17   * This library is free software; you can redistribute it and/or
  18   * modify it under the terms of the GNU Lesser General Public
  19   * License as published by the Free Software Foundation; either
  20   * version 2.1 of the License, or (at your option) any later version.
  21   *
  22   * This library is distributed in the hope that it will be useful,
  23   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  25   * Lesser General Public License for more details.
  26   * 
  27   * You should have received a copy of the GNU Lesser General Public
  28   * License along with this library; if not, write to the Free Software
  29   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  30   * 
  31   * @package xajax
  32   * @version $Id$
  33   * @copyright Copyright (c) 2005-2006  by Jared White & J. Max Wilson
  34   * @license http://www.gnu.org/copyleft/lesser.html#SEC3 LGPL License
  35   */
  36  
  37  /**
  38   * Compresses the Javascript code for more efficient delivery.
  39   * (used internally)
  40   * 
  41   * @param string contains the Javascript code to compress
  42   */
  43  function xajaxCompressJavascript($sJS)
  44  {
  45      //remove windows cariage returns
  46      $sJS = str_replace("\r","",$sJS);
  47      
  48      //array to store replaced literal strings
  49      $literal_strings = array();
  50      
  51      //explode the string into lines
  52      $lines = explode("\n",$sJS);
  53      //loop through all the lines, building a new string at the same time as removing literal strings
  54      $clean = "";
  55      $inComment = false;
  56      $literal = "";
  57      $inQuote = false;
  58      $escaped = false;
  59      $quoteChar = "";
  60      
  61      for($i=0;$i<count($lines);$i++)
  62      {
  63          $line = $lines[$i];
  64          $inNormalComment = false;
  65      
  66          //loop through line's characters and take out any literal strings, replace them with ___i___ where i is the index of this string
  67          for($j=0;$j<strlen($line);$j++)
  68          {
  69              $c = substr($line,$j,1);
  70              $d = substr($line,$j,2);
  71      
  72              //look for start of quote
  73              if(!$inQuote && !$inComment)
  74              {
  75                  //is this character a quote or a comment
  76                  if(($c=="\"" || $c=="'") && !$inComment && !$inNormalComment)
  77                  {
  78                      $inQuote = true;
  79                      $inComment = false;
  80                      $escaped = false;
  81                      $quoteChar = $c;
  82                      $literal = $c;
  83                  }
  84                  else if($d=="/*" && !$inNormalComment)
  85                  {
  86                      $inQuote = false;
  87                      $inComment = true;
  88                      $escaped = false;
  89                      $quoteChar = $d;
  90                      $literal = $d;    
  91                      $j++;    
  92                  }
  93                  else if($d=="//") //ignore string markers that are found inside comments
  94                  {
  95                      $inNormalComment = true;
  96                      $clean .= $c;
  97                  }
  98                  else
  99                  {
 100                      $clean .= $c;
 101                  }
 102              }
 103              else //allready in a string so find end quote
 104              {
 105                  if($c == $quoteChar && !$escaped && !$inComment)
 106                  {
 107                      $inQuote = false;
 108                      $literal .= $c;
 109      
 110                      //subsitute in a marker for the string
 111                      $clean .= "___" . count($literal_strings) . "___";
 112      
 113                      //push the string onto our array
 114                      array_push($literal_strings,$literal);
 115      
 116                  }
 117                  else if($inComment && $d=="*/")
 118                  {
 119                      $inComment = false;
 120                      $literal .= $d;
 121      
 122                      //subsitute in a marker for the string
 123                      $clean .= "___" . count($literal_strings) . "___";
 124      
 125                      //push the string onto our array
 126                      array_push($literal_strings,$literal);
 127      
 128                      $j++;
 129                  }
 130                  else if($c == "\\" && !$escaped)
 131                      $escaped = true;
 132                  else
 133                      $escaped = false;
 134      
 135                  $literal .= $c;
 136              }
 137          }
 138          if($inComment) $literal .= "\n";
 139          $clean .= "\n";
 140      }
 141      //explode the clean string into lines again
 142      $lines = explode("\n",$clean);
 143      
 144      //now process each line at a time
 145      for($i=0;$i<count($lines);$i++)
 146      {
 147          $line = $lines[$i];
 148      
 149          //remove comments
 150          $line = preg_replace("/\/\/(.*)/","",$line);
 151      
 152          //strip leading and trailing whitespace
 153          $line = trim($line);
 154      
 155          //remove all whitespace with a single space
 156          $line = preg_replace("/\s+/"," ",$line);
 157      
 158          //remove any whitespace that occurs after/before an operator
 159          $line = preg_replace("/\s*([!\}\{;,&=\|\-\+\*\/\)\(:])\s*/","\\1",$line);
 160      
 161          $lines[$i] = $line;
 162      }
 163      
 164      //implode the lines
 165      $sJS = implode("\n",$lines);
 166      
 167      //make sure there is a max of 1 \n after each line
 168      $sJS = preg_replace("/[\n]+/","\n",$sJS);
 169      
 170      //strip out line breaks that immediately follow a semi-colon
 171      $sJS = preg_replace("/;\n/",";",$sJS);
 172      
 173      //curly brackets aren't on their own
 174      $sJS = preg_replace("/[\n]*\{[\n]*/","{",$sJS);
 175      
 176      //finally loop through and replace all the literal strings:
 177      for($i=0;$i<count($literal_strings);$i++)
 178          $sJS = str_replace("___".$i."___",$literal_strings[$i],$sJS);
 179      
 180      return $sJS;
 181  }
 182  ?>