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 validators.
  12      * @type HTMLPurifier_AttrDef[]
  13      * @note See HTMLPurifier_AttrDef_CSS_Font::$info for a similar impl.
  14      */
  15     protected $info;
  16
  17     /**
  18      * @param HTMLPurifier_Config $config
  19      */
  20     public function __construct($config)
  21     {
  22         $def = $config->getCSSDefinition();
  23         $this->info['list-style-type'] = $def->info['list-style-type'];
  24         $this->info['list-style-position'] = $def->info['list-style-position'];
  25         $this->info['list-style-image'] = $def->info['list-style-image'];
  26     }
  27
  28     /**
  29      * @param string $string
  30      * @param HTMLPurifier_Config $config
  31      * @param HTMLPurifier_Context $context
  32      * @return bool|string
  33      */
  34     public function validate($string, $config, $context)
  35     {
  36         // regular pre-processing
  37         $string = $this->parseCDATA($string);
  38         if ($string === '') {
  39             return false;
  40         }
  41
  42         // assumes URI doesn't have spaces in it
  43         $bits = explode(' ', strtolower($string)); // bits to process
  44
  45         $caught = array();
  46         $caught['type'] = false;
  47         $caught['position'] = false;
  48         $caught['image'] = false;
  49
  50         $i = 0; // number of catches
  51         $none = false;
  52
  53         foreach ($bits as $bit) {
  54             if ($i >= 3) {
  55                 return;
  56             } // optimization bit
  57             if ($bit === '') {
  58                 continue;
  59             }
  60             foreach ($caught as $key => $status) {
  61                 if ($status !== false) {
  62                     continue;
  63                 }
  64                 $r = $this->info['list-style-' . $key]->validate($bit, $config, $context);
  65                 if ($r === false) {
  66                     continue;
  67                 }
  68                 if ($r === 'none') {
  69                     if ($none) {
  70                         continue;
  71                     } else {
  72                         $none = true;
  73                     }
  74                     if ($key == 'image') {
  75                         continue;
  76                     }
  77                 }
  78                 $caught[$key] = $r;
  79                 $i++;
  80                 break;
  81             }
  82         }
  83
  84         if (!$i) {
  85             return false;
  86         }
  87
  88         $ret = array();
  89
  90         // construct type
  91         if ($caught['type']) {
  92             $ret[] = $caught['type'];
  93         }
  94
  95         // construct image
  96         if ($caught['image']) {
  97             $ret[] = $caught['image'];
  98         }
  99
 100         // construct position
 101         if ($caught['position']) {
 102             $ret[] = $caught['position'];
 103         }
 104
 105         if (empty($ret)) {
 106             return false;
 107         }
 108         return implode(' ', $ret);
 109     }
 110 }
 111
 112 // vim: et sw=4 sts=4