diff -r 6d109e3804ac -r 9a001a04b634 Twig-1.3.0/lib/Twig/FunctionInterface.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Twig-1.3.0/lib/Twig/FunctionInterface.php	Tue Oct 25 23:56:28 2011 +0200
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ * (c) 2010 Arnaud Le Blanc
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template function.
+ *
+ * @package    twig
+ * @author     Arnaud Le Blanc <arnaud.lb@gmail.com>
+ */
+interface Twig_FunctionInterface
+{
+    /**
+     * Compiles a function.
+     *
+     * @return string The PHP code for the function
+     */
+    function compile();
+
+    function needsEnvironment();
+
+    function needsContext();
+
+    function getSafe(Twig_Node $filterArgs);
+}