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   1  <?php
   2  
   3  /**
   4   * Injector that converts http, https and ftp text URLs to actual links.
   5   */
   6  class HTMLPurifier_Injector_Linkify extends HTMLPurifier_Injector
   7  {
   8  
   9      public $name = 'Linkify';
  10      public $needed = array('a' => array('href'));
  11  
  12      public function handleText(&$token) {
  13          if (!$this->allowsElement('a')) return;
  14  
  15          if (strpos($token->data, '://') === false) {
  16              // our really quick heuristic failed, abort
  17              // this may not work so well if we want to match things like
  18              // "google.com", but then again, most people don't
  19              return;
  20          }
  21  
  22          // there is/are URL(s). Let's split the string:
  23          // Note: this regex is extremely permissive
  24          $bits = preg_split('#((?:https?|ftp)://[^\s\'"<>()]+)#S', $token->data, -1, PREG_SPLIT_DELIM_CAPTURE);
  25  
  26          $token = array();
  27  
  28          // $i = index
  29          // $c = count
  30          // $l = is link
  31          for ($i = 0, $c = count($bits), $l = false; $i < $c; $i++, $l = !$l) {
  32              if (!$l) {
  33                  if ($bits[$i] === '') continue;
  34                  $token[] = new HTMLPurifier_Token_Text($bits[$i]);
  35              } else {
  36                  $token[] = new HTMLPurifier_Token_Start('a', array('href' => $bits[$i]));
  37                  $token[] = new HTMLPurifier_Token_Text($bits[$i]);
  38                  $token[] = new HTMLPurifier_Token_End('a');
  39              }
  40          }
  41  
  42      }
  43  
  44  }
  45  
  46  // vim: et sw=4 sts=4