[Summary view] [Print] [Text view]

   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