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   1  <?php
   2  
   3  /**
   4   * Validates shorthand CSS property background.
   5   * @warning Does not support url tokens that have internal spaces.
   6   */
   7  class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
   8  {
   9  
  10      /**
  11       * Local copy of component validators.
  12       * @note See HTMLPurifier_AttrDef_Font::$info for a similar impl.
  13       */
  14      protected $info;
  15  
  16      public function __construct($config) {
  17          $def = $config->getCSSDefinition();
  18          $this->info['background-color'] = $def->info['background-color'];
  19          $this->info['background-image'] = $def->info['background-image'];
  20          $this->info['background-repeat'] = $def->info['background-repeat'];
  21          $this->info['background-attachment'] = $def->info['background-attachment'];
  22          $this->info['background-position'] = $def->info['background-position'];
  23      }
  24  
  25      public function validate($string, $config, $context) {
  26  
  27          // regular pre-processing
  28          $string = $this->parseCDATA($string);
  29          if ($string === '') return false;
  30  
  31          // munge rgb() decl if necessary
  32          $string = $this->mungeRgb($string);
  33  
  34          // assumes URI doesn't have spaces in it
  35          $bits = explode(' ', strtolower($string)); // bits to process
  36  
  37          $caught = array();
  38          $caught['color']    = false;
  39          $caught['image']    = false;
  40          $caught['repeat']   = false;
  41          $caught['attachment'] = false;
  42          $caught['position'] = false;
  43  
  44          $i = 0; // number of catches
  45          $none = false;
  46  
  47          foreach ($bits as $bit) {
  48              if ($bit === '') continue;
  49              foreach ($caught as $key => $status) {
  50                  if ($key != 'position') {
  51                      if ($status !== false) continue;
  52                      $r = $this->info['background-' . $key]->validate($bit, $config, $context);
  53                  } else {
  54                      $r = $bit;
  55                  }
  56                  if ($r === false) continue;
  57                  if ($key == 'position') {
  58                      if ($caught[$key] === false) $caught[$key] = '';
  59                      $caught[$key] .= $r . ' ';
  60                  } else {
  61                      $caught[$key] = $r;
  62                  }
  63                  $i++;
  64                  break;
  65              }
  66          }
  67  
  68          if (!$i) return false;
  69          if ($caught['position'] !== false) {
  70              $caught['position'] = $this->info['background-position']->
  71                  validate($caught['position'], $config, $context);
  72          }
  73  
  74          $ret = array();
  75          foreach ($caught as $value) {
  76              if ($value === false) continue;
  77              $ret[] = $value;
  78          }
  79  
  80          if (empty($ret)) return false;
  81          return implode(' ', $ret);
  82  
  83      }
  84  
  85  }
  86  
  87  // vim: et sw=4 sts=4