library/HTMLPurifier/AttrDef/CSS/ListStyle.php

   1 <?php
   2
   3 /**
   4  * Validates shorthand CSS property list-style.
   5  * @warning Does not support url tokens that have internal spaces.
   6  */
   7 class HTMLPurifier_AttrDef_CSS_ListStyle extends HTMLPurifier_AttrDef
   8 {
   9
  10     /**
  11      * Local copy of component validators.
  12      * @note See HTMLPurifier_AttrDef_CSS_Font::$info for a similar impl.
  13      */
  14     protected $info;
  15
  16     public function __construct($config) {
  17         $def = $config->getCSSDefinition();
  18         $this->info['list-style-type']     = $def->info['list-style-type'];
  19         $this->info['list-style-position'] = $def->info['list-style-position'];
  20         $this->info['list-style-image'] = $def->info['list-style-image'];
  21     }
  22
  23     public function validate($string, $config, $context) {
  24
  25         // regular pre-processing
  26         $string = $this->parseCDATA($string);
  27         if ($string === '') return false;
  28
  29         // assumes URI doesn't have spaces in it
  30         $bits = explode(' ', strtolower($string)); // bits to process
  31
  32         $caught = array();
  33         $caught['type']     = false;
  34         $caught['position'] = false;
  35         $caught['image']    = false;
  36
  37         $i = 0; // number of catches
  38         $none = false;
  39
  40         foreach ($bits as $bit) {
  41             if ($i >= 3) return; // optimization bit
  42             if ($bit === '') continue;
  43             foreach ($caught as $key => $status) {
  44                 if ($status !== false) continue;
  45                 $r = $this->info['list-style-' . $key]->validate($bit, $config, $context);
  46                 if ($r === false) continue;
  47                 if ($r === 'none') {
  48                     if ($none) continue;
  49                     else $none = true;
  50                     if ($key == 'image') continue;
  51                 }
  52                 $caught[$key] = $r;
  53                 $i++;
  54                 break;
  55             }
  56         }
  57
  58         if (!$i) return false;
  59
  60         $ret = array();
  61
  62         // construct type
  63         if ($caught['type']) $ret[] = $caught['type'];
  64
  65         // construct image
  66         if ($caught['image']) $ret[] = $caught['image'];
  67
  68         // construct position
  69         if ($caught['position']) $ret[] = $caught['position'];
  70
  71         if (empty($ret)) return false;
  72         return implode(' ', $ret);
  73
  74     }
  75
  76 }
  77
  78 // vim: et sw=4 sts=4