File Content: DefinedTest.php <?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. */ namespace Twig\Node\Expression\Test; use Twig\Compiler; use Twig\Error\SyntaxError; use Twig\Node\Expression\ArrayExpression; use Twig\Node\Expression\BlockReferenceExpression; use Twig\Node\Expression\ConstantExpression; use Twig\Node\Expression\FunctionExpression; use Twig\Node\Expression\GetAttrExpression; use Twig\Node\Expression\MethodCallExpression; use Twig\Node\Expression\NameExpression; use Twig\Node\Expression\TestExpression; use Twig\Node\Node; /** * Checks if a variable is defined in the current context. * * {# defined works with variable names and variable attributes #} * {% if foo is defined %} * {# ... #} * {% endif %} * * @author Fabien Potencier <fabien@symfony.com> */ class DefinedTest extends TestExpression { public function __construct(Node $node, string $name, ?Node $arguments, int $lineno) { if ($node instanceof NameExpression) { $node->setAttribute('is_defined_test', true); } elseif ($node instanceof GetAttrExpression) { $node->setAttribute('is_defined_test', true); $this->changeIgnoreStrictCheck($node); } elseif ($node instanceof BlockReferenceExpression) { $node->setAttribute('is_defined_test', true); } elseif ($node instanceof FunctionExpression && 'constant' === $node->getAttribute('name')) { $node->setAttribute('is_defined_test', true); } elseif ($node instanceof ConstantExpression || $node instanceof ArrayExpression) { $node = new ConstantExpression(true, $node->getTemplateLine()); } elseif ($node instanceof MethodCallExpression) { $node->setAttribute('is_defined_test', true); } else { throw new SyntaxError('The "defined" test only works with simple variables.', $lineno); } parent::__construct($node, $name, $arguments, $lineno); } private function changeIgnoreStrictCheck(GetAttrExpression $node) { $node->setAttribute('optimizable', false); $node->setAttribute('ignore_strict_check', true); if ($node->getNode('node') instanceof GetAttrExpression) { $this->changeIgnoreStrictCheck($node->getNode('node')); } } public function compile(Compiler $compiler): void { $compiler->subcompile($this->getNode('node')); } } Submit