MDL-9151 HTML Purifier cleaning support - enable switch is in experimental section

MDL-9435 Reviewved url cleaning in redirect()

lib/htmlpurifier/HTMLPurifier/Strategy/Composite.php

@@ -0,0 +1,30 @@
+<?php
+
+require_once 'HTMLPurifier/Strategy.php';
+require_once 'HTMLPurifier/Config.php';
+
+/**
+ * Composite strategy that runs multiple strategies on tokens.
+ */
+class HTMLPurifier_Strategy_Composite extends HTMLPurifier_Strategy
+{
+    
+    /**
+     * List of strategies to run tokens through.
+     */
+    var $strategies = array();
+    
+    function HTMLPurifier_Strategy_Composite() {
+        trigger_error('Attempt to instantiate abstract object', E_USER_ERROR);
+    }
+    
+    function execute($tokens, $config, &$context) {
+        foreach ($this->strategies as $strategy) {
+            $tokens = $strategy->execute($tokens, $config, $context);
+        }
+        return $tokens;
+    }
+    
+}
+
+?>