- Implement StringHash wrapper ArrayObject

- Implement namespace parsing for StringHashAdapter, as well as rudimentary error-checking

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1529 48356398-32a2-884e-a903-53898d9a118a

extras/ConfigSchema/StringHash.php

@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * This is in almost every respect equivalent to an array except
+ * that it keeps track of which keys were accessed.
+ */
+class ConfigSchema_StringHash extends ArrayObject
+{
+    protected $accessed = array();
+    
+    /**
+     * Retrieves a value, and logs the access.
+     */
+    public function offsetGet($index) {
+        $this->accessed[$index] = true;
+        return parent::offsetGet($index);
+    }
+    
+    /**
+     * Returns a lookup array of all array indexes that have been accessed.
+     * @return Array in form array($index => true).
+     */
+    public function getAccessed() {
+        return $this->accessed;
+    }
+    
+    /**
+     * Resets the access array.
+     */
+    public function resetAccessed() {
+        $this->accessed = array();
+    }
+}