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<?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 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, $lineno)
{
if ($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);
}
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'));
}
}