* {# defined works with variable names and variable attributes #} * {% if foo is defined %} * {# ... #} * {% endif %} * * * @author Fabien Potencier */ class Twig_Node_Expression_Test_Defined extends Twig_Node_Expression_Test { public function __construct(Twig_Node $node, $name, Twig_Node $arguments = null, $lineno) { if ($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); } elseif ($node instanceof Twig_Node_Expression_BlockReference) { $node->setAttribute('is_defined_test', true); } elseif ($node instanceof Twig_Node_Expression_Function && 'constant' === $node->getAttribute('name')) { $node->setAttribute('is_defined_test', true); } elseif ($node instanceof Twig_Node_Expression_Constant || $node instanceof Twig_Node_Expression_Array) { $node = new Twig_Node_Expression_Constant(true, $node->getTemplateLine()); } else { throw new Twig_Error_Syntax('The "defined" test only works with simple variables.', $this->getTemplateLine()); } parent::__construct($node, $name, $arguments, $lineno); } private function changeIgnoreStrictCheck(Twig_Node_Expression_GetAttr $node) { $node->setAttribute('optimizable', false); $node->setAttribute('ignore_strict_check', true); if ($node->getNode('node') instanceof Twig_Node_Expression_GetAttr) { $this->changeIgnoreStrictCheck($node->getNode('node')); } } public function compile(Twig_Compiler $compiler) { $compiler->subcompile($this->getNode('node')); } } class_alias('Twig_Node_Expression_Test_Defined', 'Twig\Node\Expression\Test\DefinedTest', false);