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DefinedTest.php
01 <?php
02
03 /*
04 * This file is part of Twig.
05 *
06 * (c) Fabien Potencier
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * file that was distributed with this source code.
10 */
11
12 namespace Twig\Node\Expression\Test;
13
14 use Twig\Compiler;
15 use Twig\Error\SyntaxError;
16 use Twig\Node\Expression\ArrayExpression;
17 use Twig\Node\Expression\BlockReferenceExpression;
18 use Twig\Node\Expression\ConstantExpression;
19 use Twig\Node\Expression\FunctionExpression;
20 use Twig\Node\Expression\GetAttrExpression;
21 use Twig\Node\Expression\MethodCallExpression;
22 use Twig\Node\Expression\NameExpression;
23 use Twig\Node\Expression\TestExpression;
24 use Twig\Node\Node;
25
26 /**
27 * Checks if a variable is defined in the current context.
28 *
29 * {# defined works with variable names and variable attributes #}
30 * {% if foo is defined %}
31 * {# ... #}
32 * {% endif %}
33 *
34 * @author Fabien Potencier <fabien@symfony.com>
35 */
36 class DefinedTest extends TestExpression
37 {
38 public function __construct(Node $node, string $name, ?Node $arguments, int $lineno)
39 {
40 if ($node instanceof NameExpression) {
41 $node->setAttribute('is_defined_test', true);
42 } elseif ($node instanceof GetAttrExpression) {
43 $node->setAttribute('is_defined_test', true);
44 $this->changeIgnoreStrictCheck($node);
45 } elseif ($node instanceof BlockReferenceExpression) {
46 $node->setAttribute('is_defined_test', true);
47 } elseif ($node instanceof FunctionExpression && 'constant' === $node->getAttribute('name')) {
48 $node->setAttribute('is_defined_test', true);
49 } elseif ($node instanceof ConstantExpression || $node instanceof ArrayExpression) {
50 $node = new ConstantExpression(true, $node->getTemplateLine());
51 } elseif ($node instanceof MethodCallExpression) {
52 $node->setAttribute('is_defined_test', true);
53 } else {
54 throw new SyntaxError('The "defined" test only works with simple variables.', $lineno);
55 }
56
57 parent::__construct($node, $name, $arguments, $lineno);
58 }
59
60 private function changeIgnoreStrictCheck(GetAttrExpression $node)
61 {
62 $node->setAttribute('optimizable', false);
63 $node->setAttribute('ignore_strict_check', true);
64
65 if ($node->getNode('node') instanceof GetAttrExpression) {
66 $this->changeIgnoreStrictCheck($node->getNode('node'));
67 }
68 }
69
70 public function compile(Compiler $compiler)
71 {
72 $compiler->subcompile($this->getNode('node'));
73 }
74 }
75
76 class_alias('Twig\Node\Expression\Test\DefinedTest', 'Twig_Node_Expression_Test_Defined');
77