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   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