lib/htmlpurifier/HTMLPurifier/AttrDef/CSS/ListStyle.php

   1 <?php
   2
   3 require_once 'HTMLPurifier/AttrDef.php';
   4
   5 /**
   6  * Validates shorthand CSS property list-style.
   7  * @warning Does not support url tokens that have internal spaces.
   8  */
   9 class HTMLPurifier_AttrDef_CSS_ListStyle extends HTMLPurifier_AttrDef
  10 {
  11
  12     /**
  13      * Local copy of component validators.
  14      * @note See HTMLPurifier_AttrDef_CSS_Font::$info for a similar impl.
  15      */
  16     var $info;
  17
  18     function HTMLPurifier_AttrDef_CSS_ListStyle($config) {
  19         $def = $config->getCSSDefinition();
  20         $this->info['list-style-type']     = $def->info['list-style-type'];
  21         $this->info['list-style-position'] = $def->info['list-style-position'];
  22         $this->info['list-style-image'] = $def->info['list-style-image'];
  23     }
  24
  25     function validate($string, $config, &$context) {
  26
  27         // regular pre-processing
  28         $string = $this->parseCDATA($string);
  29         if ($string === '') return false;
  30
  31         // assumes URI doesn't have spaces in it
  32         $bits = explode(' ', strtolower($string)); // bits to process
  33
  34         $caught = array();
  35         $caught['type']     = false;
  36         $caught['position'] = false;
  37         $caught['image']    = false;
  38
  39         $i = 0; // number of catches
  40         $none = false;
  41
  42         foreach ($bits as $bit) {
  43             if ($i >= 3) return; // optimization bit
  44             if ($bit === '') continue;
  45             foreach ($caught as $key => $status) {
  46                 if ($status !== false) continue;
  47                 $r = $this->info['list-style-' . $key]->validate($bit, $config, $context);
  48                 if ($r === false) continue;
  49                 if ($r === 'none') {
  50                     if ($none) continue;
  51                     else $none = true;
  52                     if ($key == 'image') continue;
  53                 }
  54                 $caught[$key] = $r;
  55                 $i++;
  56                 break;
  57             }
  58         }
  59
  60         if (!$i) return false;
  61
  62         $ret = array();
  63
  64         // construct type
  65         if ($caught['type']) $ret[] = $caught['type'];
  66
  67         // construct image
  68         if ($caught['image']) $ret[] = $caught['image'];
  69
  70         // construct position
  71         if ($caught['position']) $ret[] = $caught['position'];
  72
  73         if (empty($ret)) return false;
  74         return implode(' ', $ret);
  75
  76     }
  77
  78 }
  79
  80 ?>