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   1  <?php
   2  
   3  /**
   4   * Component of HTMLPurifier_AttrContext that accumulates IDs to prevent dupes
   5   * @note In Slashdot-speak, dupe means duplicate.
   6   * @note The default constructor does not accept $config or $context objects:
   7   *       use must use the static build() factory method to perform initialization.
   8   */
   9  class HTMLPurifier_IDAccumulator
  10  {
  11  
  12      /**
  13       * Lookup table of IDs we've accumulated.
  14       * @public
  15       */
  16      public $ids = array();
  17  
  18      /**
  19       * Builds an IDAccumulator, also initializing the default blacklist
  20       * @param $config Instance of HTMLPurifier_Config
  21       * @param $context Instance of HTMLPurifier_Context
  22       * @return Fully initialized HTMLPurifier_IDAccumulator
  23       */
  24      public static function build($config, $context) {
  25          $id_accumulator = new HTMLPurifier_IDAccumulator();
  26          $id_accumulator->load($config->get('Attr', 'IDBlacklist'));
  27          return $id_accumulator;
  28      }
  29  
  30      /**
  31       * Add an ID to the lookup table.
  32       * @param $id ID to be added.
  33       * @return Bool status, true if success, false if there's a dupe
  34       */
  35      public function add($id) {
  36          if (isset($this->ids[$id])) return false;
  37          return $this->ids[$id] = true;
  38      }
  39  
  40      /**
  41       * Load a list of IDs into the lookup table
  42       * @param $array_of_ids Array of IDs to load
  43       * @note This function doesn't care about duplicates
  44       */
  45      public function load($array_of_ids) {
  46          foreach ($array_of_ids as $id) {
  47              $this->ids[$id] = true;
  48          }
  49      }
  50  
  51  }
  52  
  53  // vim: et sw=4 sts=4