changed the way we store node filenames

lib/Twig/Compiler.php

@@ -85,7 +85,7 @@ class Twig_Compiler implements Twig_CompilerInterface
         $this->indentation = $indentation;
 
         if ($node instanceof Twig_Node_Module) {
-            $this->addFilenameAttribute($node, $node->getAttribute('filename'));
+            $node->setFilename($node->getAttribute('filename'));
 
             // to be removed in 2.0
             $this->filename = $node->getAttribute('filename');
@@ -282,16 +282,4 @@ class Twig_Compiler implements Twig_CompilerInterface
     {
         return sprintf('__internal_%s', hash('sha256', uniqid(mt_rand(), true), false));
     }
-
-    private function addFilenameAttribute(Twig_Node $node, $filename)
-    {
-        $node->setAttribute('module_filename', $filename);
-        foreach ($node as $n) {
-            if (null !== $n) {
-                $this->addFilenameAttribute($n, $filename);
-            }
-        }
-
-        return $node;
-    }
 }

lib/Twig/Node.php

@@ -22,6 +22,8 @@ class Twig_Node implements Twig_NodeInterface
     protected $lineno;
     protected $tag;
 
+    private $filename;
+
     /**
      * Constructor.
      *
@@ -229,10 +231,18 @@ class Twig_Node implements Twig_NodeInterface
         return new ArrayIterator($this->nodes);
     }
 
-    public function getFilename()
+    public function setFilename($filename)
     {
-        if ($this->hasAttribute('module_filename')) {
-            return $this->getAttribute('module_filename');
+        $this->filename = $filename;
+        foreach ($this->nodes as $node) {
+            if (null !== $node) {
+                $node->setFilename($filename);
+            }
         }
     }
+
+    public function getFilename()
+    {
+        return $this->filename;
+    }
 }