library/HTMLPurifier/Injector/Linkify.php

   1 <?php
   2
   3 require_once 'HTMLPurifier/Injector.php';
   4
   5 /**
   6  * Injector that converts http, https and ftp text URLs to actual links.
   7  */
   8 class HTMLPurifier_Injector_Linkify extends HTMLPurifier_Injector
   9 {
  10
  11     function handleText(&$token, $config, &$context) {
  12         $current_nesting =& $context->get('CurrentNesting');
  13         // this snippet could be factored out
  14         $definition = $config->getHTMLDefinition();
  15         if (!empty($current_nesting)) {
  16             $parent_token = array_pop($current_nesting);
  17             $current_nesting[] = $parent_token;
  18             $parent = $definition->info[$parent_token->name];
  19         } else {
  20             $parent = $definition->info_parent_def;
  21         }
  22         if (!isset($parent->child->elements['a'])) {
  23             // parent element does not allow link elements, don't bother
  24             return;
  25         }
  26         if (strpos($token->data, '://') === false) {
  27             // our really quick heuristic failed, abort
  28             // this may not work so well if we want to match things like
  29             // "google.com"
  30             return;
  31         }
  32         // there is/are URL(s). Let's split the string:
  33
  34         $bits = preg_split('#((?:https?|ftp)://[^\s\'"<>()]+)#S', $token->data, -1, PREG_SPLIT_DELIM_CAPTURE);
  35
  36         $token = array();
  37
  38         // $i = index
  39         // $c = count
  40         // $l = is link
  41         for ($i = 0, $c = count($bits), $l = false; $i < $c; $i++, $l = !$l) {
  42             if (!$l) {
  43                 if ($bits[$i] === '') continue;
  44                 $token[] = new HTMLPurifier_Token_Text($bits[$i]);
  45             } else {
  46                 $token[] = new HTMLPurifier_Token_Start('a', array('href' => $bits[$i]));
  47                 $token[] = new HTMLPurifier_Token_Text($bits[$i]);
  48                 $token[] = new HTMLPurifier_Token_End('a');
  49             }
  50         }
  51
  52     }
  53
  54 }
  55
  56 ?>