public function __construct(Twig_NodeInterface $node, Twig_Node_Expression_Constant $filterName, Twig_NodeInterface $arguments, $lineno, $tag = null) { $default = new Twig_Node_Expression_Filter($node, new Twig_Node_Expression_Constant('default', $node->getTemplateLine()), $arguments, $node->getTemplateLine()); if ('default' === $filterName->getAttribute('value') && ($node instanceof Twig_Node_Expression_Name || $node instanceof Twig_Node_Expression_GetAttr)) { $test = new Twig_Node_Expression_Test_Defined(clone $node, 'defined', new Twig_Node(), $node->getTemplateLine()); $false = count($arguments) ? $arguments->getNode(0) : new Twig_Node_Expression_Constant('', $node->getTemplateLine()); $node = new Twig_Node_Expression_Conditional($test, $default, $false, $node->getTemplateLine()); } else { $node = $default; } parent::__construct($node, $filterName, $arguments, $lineno, $tag); }