library/HTMLPurifier/Injector/Linkify.php

   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