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 <?php
 
 /**
  * Component of HTMLPurifier_AttrContext that accumulates IDs to prevent dupes
  * @note In Slashdot-speak, dupe means duplicate.
  * @note The default constructor does not accept $config or $context objects:
  *       use must use the static build() factory method to perform initialization.
  */
 class HTMLPurifier_IDAccumulator
 {
 
     /**
      * Lookup table of IDs we've accumulated.
      * @public
      */
     public $ids = array();
 
     /**
      * Builds an IDAccumulator, also initializing the default blacklist
      * @param HTMLPurifier_Config $config Instance of HTMLPurifier_Config
      * @param HTMLPurifier_Context $context Instance of HTMLPurifier_Context
      * @return HTMLPurifier_IDAccumulator Fully initialized HTMLPurifier_IDAccumulator
      */
     public static function build($config, $context)
     {
         $id_accumulator = new HTMLPurifier_IDAccumulator();
         $id_accumulator->load($config->get('Attr.IDBlacklist'));
         return $id_accumulator;
     }
 
     /**
      * Add an ID to the lookup table.
      * @param string $id ID to be added.
      * @return bool status, true if success, false if there's a dupe
      */
     public function add($id)
     {
         if (isset($this->ids[$id])) {
             return false;
         }
         return $this->ids[$id] = true;
     }
 
     /**
      * Load a list of IDs into the lookup table
      * @param $array_of_ids Array of IDs to load
      * @note This function doesn't care about duplicates
      */
     public function load($array_of_ids)
     {
         foreach ($array_of_ids as $id) {
             $this->ids[$id] = true;
         }
     }
 }
 
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