75 lines
2.5 KiB
PHP
75 lines
2.5 KiB
PHP
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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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namespace Twig\Node\Expression\Test;
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use Twig\Compiler;
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use Twig\Error\SyntaxError;
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use Twig\Node\Expression\ArrayExpression;
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use Twig\Node\Expression\BlockReferenceExpression;
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use Twig\Node\Expression\ConstantExpression;
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use Twig\Node\Expression\FunctionExpression;
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use Twig\Node\Expression\GetAttrExpression;
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use Twig\Node\Expression\MethodCallExpression;
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use Twig\Node\Expression\NameExpression;
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use Twig\Node\Expression\TestExpression;
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use Twig\Node\Node;
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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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* {# 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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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class DefinedTest extends TestExpression
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{
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public function __construct(Node $node, string $name, ?Node $arguments, int $lineno)
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{
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if ($node instanceof NameExpression) {
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$node->setAttribute('is_defined_test', true);
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} elseif ($node instanceof GetAttrExpression) {
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$node->setAttribute('is_defined_test', true);
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$this->changeIgnoreStrictCheck($node);
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} elseif ($node instanceof BlockReferenceExpression) {
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$node->setAttribute('is_defined_test', true);
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} elseif ($node instanceof FunctionExpression && 'constant' === $node->getAttribute('name')) {
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$node->setAttribute('is_defined_test', true);
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} elseif ($node instanceof ConstantExpression || $node instanceof ArrayExpression) {
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$node = new ConstantExpression(true, $node->getTemplateLine());
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} elseif ($node instanceof MethodCallExpression) {
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$node->setAttribute('is_defined_test', true);
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} else {
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throw new SyntaxError('The "defined" test only works with simple variables.', $lineno);
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}
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parent::__construct($node, $name, $arguments, $lineno);
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}
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private function changeIgnoreStrictCheck(GetAttrExpression $node)
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{
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$node->setAttribute('optimizable', false);
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$node->setAttribute('ignore_strict_check', true);
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if ($node->getNode('node') instanceof GetAttrExpression) {
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$this->changeIgnoreStrictCheck($node->getNode('node'));
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}
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}
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public function compile(Compiler $compiler): void
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{
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$compiler->subcompile($this->getNode('node'));
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}
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}
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