refactored node transformers to node visitors

git-svn-id: http://svn.twig-project.org/trunk@202 93ef8e89-cb99-4229-a87c-7fa0fa45744b

diff --git a/lib/Twig/NodeVisitorInterface.php b/lib/Twig/NodeVisitorInterface.php
new file mode 100644 (file)
index 0000000..2d2277b
--- /dev/null
+++ b/lib/Twig/NodeVisitorInterface.php
@@ -0,0 +1,8 @@
+<?php
+
+interface Twig_NodeVisitorInterface
+{
+  public function enterNode(Twig_Node $node, Twig_Environment $env);
+
+  public function leaveNode(Twig_Node $node, Twig_Environment $env);
+}