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63 lines
2.2 KiB
63 lines
2.2 KiB
7 years ago
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<?php
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/*
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* This file is part of Twig.
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*
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* (c) Fabien Potencier
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Checks if a variable is defined in the current context.
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*
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* <pre>
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* {# defined works with variable names and variable attributes #}
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* {% if foo is defined %}
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* {# ... #}
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* {% endif %}
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* </pre>
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_Node_Expression_Test_Defined extends Twig_Node_Expression_Test
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{
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public function __construct(Twig_Node $node, $name, Twig_Node $arguments = null, $lineno)
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{
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if ($node instanceof Twig_Node_Expression_Name) {
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$node->setAttribute('is_defined_test', true);
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} elseif ($node instanceof Twig_Node_Expression_GetAttr) {
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$node->setAttribute('is_defined_test', true);
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$this->changeIgnoreStrictCheck($node);
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} elseif ($node instanceof Twig_Node_Expression_BlockReference) {
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$node->setAttribute('is_defined_test', true);
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} elseif ($node instanceof Twig_Node_Expression_Function && 'constant' === $node->getAttribute('name')) {
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$node->setAttribute('is_defined_test', true);
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} elseif ($node instanceof Twig_Node_Expression_Constant || $node instanceof Twig_Node_Expression_Array) {
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$node = new Twig_Node_Expression_Constant(true, $node->getTemplateLine());
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} else {
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throw new Twig_Error_Syntax('The "defined" test only works with simple variables.', $this->getTemplateLine());
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}
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parent::__construct($node, $name, $arguments, $lineno);
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}
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private function changeIgnoreStrictCheck(Twig_Node_Expression_GetAttr $node)
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{
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$node->setAttribute('optimizable', false);
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$node->setAttribute('ignore_strict_check', true);
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if ($node->getNode('node') instanceof Twig_Node_Expression_GetAttr) {
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$this->changeIgnoreStrictCheck($node->getNode('node'));
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}
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}
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public function compile(Twig_Compiler $compiler)
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{
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$compiler->subcompile($this->getNode('node'));
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}
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}
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class_alias('Twig_Node_Expression_Test_Defined', 'Twig\Node\Expression\Test\DefinedTest', false);
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