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diff --git a/vendor/twig/twig/lib/Twig/NodeVisitor/Sandbox.php b/vendor/twig/twig/lib/Twig/NodeVisitor/Sandbox.php
new file mode 100644
index 000000000..baf00a034
--- /dev/null
+++ b/vendor/twig/twig/lib/Twig/NodeVisitor/Sandbox.php
@@ -0,0 +1,75 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig_NodeVisitor_Sandbox implements sandboxing.
+ *
+ * @final
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_NodeVisitor_Sandbox extends Twig_BaseNodeVisitor
+{
+    protected $inAModule = false;
+    protected $tags;
+    protected $filters;
+    protected $functions;
+
+    protected function doEnterNode(Twig_Node $node, Twig_Environment $env)
+    {
+        if ($node instanceof Twig_Node_Module) {
+            $this->inAModule = true;
+            $this->tags = array();
+            $this->filters = array();
+            $this->functions = array();
+
+            return $node;
+        } elseif ($this->inAModule) {
+            // look for tags
+            if ($node->getNodeTag() && !isset($this->tags[$node->getNodeTag()])) {
+                $this->tags[$node->getNodeTag()] = $node;
+            }
+
+            // look for filters
+            if ($node instanceof Twig_Node_Expression_Filter && !isset($this->filters[$node->getNode('filter')->getAttribute('value')])) {
+                $this->filters[$node->getNode('filter')->getAttribute('value')] = $node;
+            }
+
+            // look for functions
+            if ($node instanceof Twig_Node_Expression_Function && !isset($this->functions[$node->getAttribute('name')])) {
+                $this->functions[$node->getAttribute('name')] = $node;
+            }
+
+            // wrap print to check __toString() calls
+            if ($node instanceof Twig_Node_Print) {
+                return new Twig_Node_SandboxedPrint($node->getNode('expr'), $node->getTemplateLine(), $node->getNodeTag());
+            }
+        }
+
+        return $node;
+    }
+
+    protected function doLeaveNode(Twig_Node $node, Twig_Environment $env)
+    {
+        if ($node instanceof Twig_Node_Module) {
+            $this->inAModule = false;
+
+            $node->setNode('display_start', new Twig_Node(array(new Twig_Node_CheckSecurity($this->filters, $this->tags, $this->functions), $node->getNode('display_start'))));
+        }
+
+        return $node;
+    }
+
+    public function getPriority()
+    {
+        return 0;
+    }
+}