<?php /* * This file is part of Twig. * * (c) 2011 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 defined in the current context. * * <pre> * {# defined works with variable names and variable attributes #} * {% if foo is defined %} * {# ... #} * {% endif %} * </pre> * * @author Fabien Potencier <fabien@symfony.com> */ class Twig_Node_Expression_Test_Defined extends Twig_Node_Expression_Test { public function __construct(Twig_NodeInterface $node, $name, Twig_NodeInterface $arguments = null, $lineno) { parent::__construct($node, $name, $arguments, $lineno); if ($node instanceof Twig_Node_Expression_Name) { $node->setAttribute('is_defined_test', true); } elseif ($node instanceof Twig_Node_Expression_GetAttr) { $node->setAttribute('is_defined_test', true); $this->changeIgnoreStrictCheck($node); } else { throw new Twig_Error_Syntax('The "defined" test only works with simple variables', $this->getLine()); } } protected function changeIgnoreStrictCheck(Twig_Node_Expression_GetAttr $node) { $node->setAttribute('ignore_strict_check', true); if ($node->getNode('node') instanceof Twig_Node_Expression_GetAttr) { $this->changeIgnoreStrictCheck($node->getNode('node')); } } public function compile(Twig_Compiler $compiler) { $compiler->subcompile($this->getNode('node')); } }