MDL-22537 new html purifier backported to stable, unfortunately PHP5 only

lib/htmlpurifier/HTMLPurifier/Strategy.php

@@ -2,31 +2,25 @@
 
 /**
  * Supertype for classes that define a strategy for modifying/purifying tokens.
- * 
- * While HTMLPurifier's core purpose is fixing HTML into something proper, 
+ *
+ * While HTMLPurifier's core purpose is fixing HTML into something proper,
  * strategies provide plug points for extra configuration or even extra
  * features, such as custom tags, custom parsing of text, etc.
  */
 
-HTMLPurifier_ConfigSchema::define(
-    'Core', 'EscapeInvalidTags', false, 'bool',
-    'When true, invalid tags will be written back to the document as plain '.
-    'text.  Otherwise, they are silently dropped.'
-);
- 
-class HTMLPurifier_Strategy
+
+abstract class HTMLPurifier_Strategy
 {
-    
+
     /**
      * Executes the strategy on the tokens.
-     * 
+     *
      * @param $tokens Array of HTMLPurifier_Token objects to be operated on.
      * @param $config Configuration options
      * @returns Processed array of token objects.
      */
-    function execute($tokens, $config, &$context) {
-        trigger_error('Cannot call abstract function', E_USER_ERROR);
-    }
-    
+    abstract public function execute($tokens, $config, $context);
+
 }
 
+// vim: et sw=4 sts=4