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     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