--- /dev/null
+<?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.
+ */
+
+/**
+ * Checks if a variable is the exact same value as a constant.
+ *
+ * <pre>
+ * {% if post.status is constant('Post::PUBLISHED') %}
+ * the status attribute is exactly the same as Post::PUBLISHED
+ * {% endif %}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Constant extends Twig_Node_Expression_Test
+{
+ public function compile(Twig_Compiler $compiler)
+ {
+ $compiler
+ ->raw('(')
+ ->subcompile($this->getNode('node'))
+ ->raw(' === constant(')
+ ;
+
+ if ($this->getNode('arguments')->hasNode(1)) {
+ $compiler
+ ->raw('get_class(')
+ ->subcompile($this->getNode('arguments')->getNode(1))
+ ->raw(')."::".')
+ ;
+ }
+
+ $compiler
+ ->subcompile($this->getNode('arguments')->getNode(0))
+ ->raw('))')
+ ;
+ }
+}