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   1  <?php
   2  
   3  /**
   4  * Base filter class.
   5  */
   6  require_once 'Savant2/Filter.php';
   7  
   8  /**
   9  * 
  10  * Remove extra white space within the text.
  11  * 
  12  * $Id: Savant2_Filter_trimwhitespace.php 18360 2005-05-26 19:38:09Z mipmip $
  13  * 
  14  * @author Monte Ohrt <monte@ispi.net>
  15  * 
  16  * @author Contributions from Lars Noschinski <lars@usenet.noschinski.de>
  17  * 
  18  * @author Converted to a Savant2 filter by Paul M. Jones
  19  * <pmjones@ciaweb.net>
  20  * 
  21  * @license http://www.gnu.org/copyleft/lesser.html LGPL
  22  * 
  23  * This program is free software; you can redistribute it and/or modify
  24  * it under the terms of the GNU Lesser General Public License as
  25  * published by the Free Software Foundation; either version 2.1 of the
  26  * License, or (at your option) any later version.
  27  *
  28  * This program is distributed in the hope that it will be useful, but
  29  * WITHOUT ANY WARRANTY; without even the implied warranty of
  30  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  31  * Lesser General Public License for more details.
  32  * 
  33  */
  34  
  35  class Savant2_Filter_trimwhitespace extends Savant2_Filter {
  36  
  37      /**
  38      * 
  39      * Removes extra white space within the text.
  40      * 
  41      * Trim leading white space and blank lines from template source after it
  42      * gets interpreted, cleaning up code and saving bandwidth. Does not
  43      * affect <PRE>></PRE> and <SCRIPT></SCRIPT> blocks.<br>
  44      * 
  45      * @access public
  46      * 
  47      * @param string &$source The source text to be filtered.
  48      *
  49      */
  50      
  51  	function filter(&$source)
  52      {
  53          // Pull out the script blocks
  54          preg_match_all("!<script[^>]+>.*?</script>!is", $source, $match);
  55          $_script_blocks = $match[0];
  56          $source = preg_replace("!<script[^>]+>.*?</script>!is",
  57          '@@@SAVANT:TRIM:SCRIPT@@@', $source);
  58      
  59          // Pull out the pre blocks
  60          preg_match_all("!<pre[^>]+>.*?</pre>!is", $source, $match);
  61          $_pre_blocks = $match[0];
  62          $source = preg_replace("!<pre[^>]+>.*?</pre>!is",
  63          '@@@SAVANT:TRIM:PRE@@@', $source);
  64      
  65          // Pull out the textarea blocks
  66          preg_match_all("!<textarea[^>]+>.*?</textarea>!is", $source, $match);
  67          $_textarea_blocks = $match[0];
  68          $source = preg_replace("!<textarea[^>]+>.*?</textarea>!is",
  69          '@@@SAVANT:TRIM:TEXTAREA@@@', $source);
  70      
  71          // remove all leading spaces, tabs and carriage returns NOT
  72          // preceeded by a php close tag.
  73              $source = trim(preg_replace('/((?<!\?>)\n)[\s]+/m', '\1', $source));
  74      
  75          // replace script blocks
  76          Savant2_Filter_trimwhitespace::_replace(
  77              "@@@SAVANT:TRIM:SCRIPT@@@",$_script_blocks, $source);
  78      
  79          // replace pre blocks
  80          Savant2_Filter_trimwhitespace::_replace(
  81              "@@@SAVANT:TRIM:PRE@@@",$_pre_blocks, $source);
  82      
  83          // replace textarea blocks
  84          Savant2_Filter_trimwhitespace::_replace(
  85              "@@@SAVANT:TRIM:TEXTAREA@@@",$_textarea_blocks, $source);
  86      
  87          return $source; 
  88      }
  89  
  90  	function _replace($search_str, $replace, &$subject)
  91      {
  92          $_len = strlen($search_str);
  93          $_pos = 0;
  94          for ($_i=0, $_count=count($replace); $_i<$_count; $_i++) {
  95              if (($_pos=strpos($subject, $search_str, $_pos))!==false) {
  96                  $subject = substr_replace($subject, $replace[$_i], $_pos, $_len);
  97              } else {
  98                  break;
  99              }
 100          }
 101      }
 102  
 103  }
 104  ?>