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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       * @type string
  10       */
  11      public $name = 'Linkify';
  12  
  13      /**
  14       * @type array
  15       */
  16      public $needed = array('a' => array('href'));
  17  
  18      /**
  19       * @param HTMLPurifier_Token $token
  20       */
  21      public function handleText(&$token)
  22      {
  23          if (!$this->allowsElement('a')) {
  24              return;
  25          }
  26  
  27          if (strpos($token->data, '://') === false) {
  28              // our really quick heuristic failed, abort
  29              // this may not work so well if we want to match things like
  30              // "google.com", but then again, most people don't
  31              return;
  32          }
  33  
  34          // there is/are URL(s). Let's split the string.
  35          // We use this regex:
  36          // https://gist.github.com/gruber/249502
  37          // but with @cscott's backtracking fix and also
  38          // the Unicode characters un-Unicodified.
  39          $bits = preg_split(
  40              '/\\b((?:[a-z][\\w\\-]+:(?:\\/{1,3}|[a-z0-9%])|www\\d{0,3}[.]|[a-z0-9.\\-]+[.][a-z]{2,4}\\/)(?:[^\\s()<>]|\\((?:[^\\s()<>]|(?:\\([^\\s()<>]+\\)))*\\))+(?:\\((?:[^\\s()<>]|(?:\\([^\\s()<>]+\\)))*\\)|[^\\s`!()\\[\\]{};:\'".,<>?\x{00ab}\x{00bb}\x{201c}\x{201d}\x{2018}\x{2019}]))/iu',
  41              $token->data, -1, PREG_SPLIT_DELIM_CAPTURE);
  42  
  43  
  44          $token = array();
  45  
  46          // $i = index
  47          // $c = count
  48          // $l = is link
  49          for ($i = 0, $c = count($bits), $l = false; $i < $c; $i++, $l = !$l) {
  50              if (!$l) {
  51                  if ($bits[$i] === '') {
  52                      continue;
  53                  }
  54                  $token[] = new HTMLPurifier_Token_Text($bits[$i]);
  55              } else {
  56                  $token[] = new HTMLPurifier_Token_Start('a', array('href' => $bits[$i]));
  57                  $token[] = new HTMLPurifier_Token_Text($bits[$i]);
  58                  $token[] = new HTMLPurifier_Token_End('a');
  59              }
  60          }
  61      }
  62  }
  63  
  64  // vim: et sw=4 sts=4