portal/patient/fwk/libs/savant/Savant3/resources/Savant3_Filter_trimwhitespace.php

   1 <?php
   2
   3 /**
   4  *
   5  * Filter to remove extra white space within the text.
   6  *
   7  * @package Savant3
   8  *
   9  * @author Monte Ohrt <monte@ispi.net>
  10  *
  11  * @author Contributions from Lars Noschinski <lars@usenet.noschinski.de>
  12  *
  13  * @author Converted to a Savant3 filter by Paul M. Jones <pmjones@ciaweb.net>
  14  *
  15  * @license http://www.gnu.org/copyleft/lesser.html LGPL
  16  *
  17  * @version $Id: Savant3_Filter_trimwhitespace.php,v 1.4 2005/05/29 15:27:07 pmjones Exp $
  18  *
  19  */
  20
  21 /**
  22  *
  23  * Filter to remove extra white space within the text.
  24  *
  25  * @package Savant3
  26  *
  27  * @author Monte Ohrt <monte@ispi.net>
  28  *
  29  * @author Contributions from Lars Noschinski <lars@usenet.noschinski.de>
  30  *
  31  * @author Converted to a Savant3 filter by Paul M. Jones <pmjones@ciaweb.net>
  32  *
  33  *
  34  */
  35 class Savant3_Filter_trimwhitespace extends Savant3_Filter
  36 {
  37     /**
  38      *
  39      * Removes extra white space within the text.
  40      *
  41      * Trim leading white space and blank lines from template source
  42      * after it gets interpreted, cleaning up code and saving bandwidth.
  43      * Does not affect <pre></pre>, <script></script>, or
  44      * <textarea></textarea> blocks.
  45      *
  46      * @access public
  47      *
  48      * @param string $buffer
  49      *          The source text to be filtered.
  50      *
  51      * @return string The filtered text.
  52      *
  53      */
  54     public static function filter($buffer)
  55     {
  56         // Pull out the script blocks
  57         preg_match_all("!<script[^>]+>.*?</script>!is", $buffer, $match);
  58         $script_blocks = $match [0];
  59         $buffer = preg_replace("!<script[^>]+>.*?</script>!is", '@@@SAVANT:TRIM:SCRIPT@@@', $buffer);
  60
  61         // Pull out the pre blocks
  62         preg_match_all("!<pre[^>]*>.*?</pre>!is", $buffer, $match);
  63         $pre_blocks = $match [0];
  64         $buffer = preg_replace("!<pre[^>]*>.*?</pre>!is", '@@@SAVANT:TRIM:PRE@@@', $buffer);
  65
  66         // Pull out the textarea blocks
  67         preg_match_all("!<textarea[^>]+>.*?</textarea>!is", $buffer, $match);
  68         $textarea_blocks = $match [0];
  69         $buffer = preg_replace("!<textarea[^>]+>.*?</textarea>!is", '@@@SAVANT:TRIM:TEXTAREA@@@', $buffer);
  70
  71         // remove all leading spaces, tabs and carriage returns NOT
  72         // preceeded by a php close tag.
  73         $buffer = trim(preg_replace('/((?<!\?>)\n)[\s]+/m', '\1', $buffer));
  74
  75         // replace script blocks
  76         Savant3_Filter_trimwhitespace::replace("@@@SAVANT:TRIM:SCRIPT@@@", $script_blocks, $buffer);
  77
  78         // replace pre blocks
  79         Savant3_Filter_trimwhitespace::replace("@@@SAVANT:TRIM:PRE@@@", $pre_blocks, $buffer);
  80
  81         // replace textarea blocks
  82         Savant3_Filter_trimwhitespace::replace("@@@SAVANT:TRIM:TEXTAREA@@@", $textarea_blocks, $buffer);
  83
  84         return $buffer;
  85     }
  86
  87     /**
  88      *
  89      * Does a simple search-and-replace on the source text.
  90      *
  91      * @access protected
  92      *
  93      * @param string $search
  94      *          The string to search for.
  95      *
  96      * @param string $replace
  97      *          Replace with this text.
  98      *
  99      * @param
 100      *          string &$buffer The source text.
 101      *
 102      * @return string The text after search-and-replace.
 103      *
 104      */
 105     protected static function replace($search, $replace, &$buffer)
 106     {
 107         $len = strlen($search);
 108         $pos = 0;
 109         $count = count($replace);
 110
 111         for ($i = 0; $i < $count; $i++) {
 112             // does the search-string exist in the buffer?
 113             $pos = strpos($buffer, $search, $pos);
 114             if ($pos !== false) {
 115                 // replace the search-string
 116                 $buffer = substr_replace($buffer, $replace [$i], $pos, $len);
 117             } else {
 118                 break;
 119             }
 120         }
 121     }
 122 }