vendor/domit/xml_domit_doctor.php

   1 <?php
   2 /**
   3 * DOMIT! Doctor is a set of utilities for repairing malformed XML
   4 * @package domit-xmlparser
   5 * @copyright (C) 2004 John Heinstein. All rights reserved
   6 * @license http://www.gnu.org/copyleft/lesser.html LGPL License
   7 * @author John Heinstein <johnkarl@nbnet.nb.ca>
   8 * @link http://www.engageinteractive.com/domit/ DOMIT! Home Page
   9 * DOMIT! is Free Software
  10 **/
  11
  12 /**
  13 * A (static) class containing utilities for repairing malformed XML
  14 *
  15 * @package domit-xmlparser
  16 * @author John Heinstein <johnkarl@nbnet.nb.ca>
  17 */
  18 class domit_doctor {
  19
  20         /**
  21         * Looks for illegal ampersands and converts them to entities
  22         * @param string The xml text to be repaired
  23         * @return string The repaired xml text
  24         */
  25         function fixAmpersands($xmlText) {
  26                 $xmlText = trim($xmlText);
  27                 $startIndex = -1;
  28                 $processing = true;
  29                 $illegalChar = '&';
  30
  31                 while ($processing) {
  32                         $startIndex = strpos($xmlText, $illegalChar, ($startIndex + 1));
  33
  34                         if ($startIndex !== false) {
  35                                 $xmlText = domit_doctor::evaluateCharacter($xmlText,
  36                                                                         $illegalChar, ($startIndex + 1));
  37                         }
  38                         else {
  39                                 $processing = false;
  40                         }
  41                 }
  42
  43                 return $xmlText;
  44         } //fixAmpersands
  45
  46         /**
  47         * Evaluates whether an ampersand should be converted to an entity, and performs the conversion
  48         * @param string The xml text
  49         * @param string The (ampersand) character
  50         * @param int The character index immediately following the ampersand in question
  51         * @return string The repaired xml text
  52         */
  53         function evaluateCharacter($xmlText, $illegalChar, $startIndex) {
  54                 $total = strlen($xmlText);
  55                 $searchingForCDATASection = false;
  56
  57                 for ($i = $startIndex; $i < $total; $i++) {
  58                         $currChar = substr($xmlText, $i, 1);
  59
  60                         if (!$searchingForCDATASection) {
  61                                 switch ($currChar) {
  62                                         case ' ':
  63                                         case "'":
  64                                         case '"':
  65                                         case "\n":
  66                                         case "\r":
  67                                         case "\t":
  68                                         case '&':
  69                                         case "]":
  70                                                 $searchingForCDATASection = true;
  71                                                 break;
  72                                         case ";":
  73                                                 return $xmlText;
  74                                                 break;
  75                                 }
  76                         }
  77                         else {
  78                                 switch ($currChar) {
  79                                         case '<':
  80                                         case '>':
  81                                                 return (substr_replace($xmlText, '&amp;',
  82                                                                                 ($startIndex - 1) , 1));
  83                                                 break;
  84                                         case "]":
  85                                                 return $xmlText;
  86                                                 break;
  87                                 }
  88                         }
  89                 }
  90
  91                 return $xmlText;
  92         } //evaluateCharacter
  93 } //domit_doctor
  94 ?>