--- /dev/null
+<?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 $config Instance of HTMLPurifier_Config
+ * @param $context Instance of HTMLPurifier_Context
+ * @return Fully initialized HTMLPurifier_IDAccumulator
+ */
+ public static function build($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 $id ID to be added.
+ * @return Bool status, true if success, false if there's a dupe
+ */
+ public function add($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;
+ }
+ }
+
+}
+
+// vim: et sw=4 sts=4