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- 28.08.2024
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IfTokenParser.php
01 <?php
02
03 /*
04 * This file is part of Twig.
05 *
06 * (c) Fabien Potencier
07 * (c) Armin Ronacher
08 *
09 * For the full copyright and license information, please view the LICENSE
10 * file that was distributed with this source code.
11 */
12
13 namespace Twig\TokenParser;
14
15 use Twig\Error\SyntaxError;
16 use Twig\Node\IfNode;
17 use Twig\Node\Node;
18 use Twig\Token;
19
20 /**
21 * Tests a condition.
22 *
23 * {% if users %}
24 * <ul>
25 * {% for user in users %}
26 * <li>{{ user.username|e }}</li>
27 * {% endfor %}
28 * </ul>
29 * {% endif %}
30 */
31 final class IfTokenParser extends AbstractTokenParser
32 {
33 public function parse(Token $token)
34 {
35 $lineno = $token->getLine();
36 $expr = $this->parser->getExpressionParser()->parseExpression();
37 $stream = $this->parser->getStream();
38 $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
39 $body = $this->parser->subparse([$this, 'decideIfFork']);
40 $tests = [$expr, $body];
41 $else = null;
42
43 $end = false;
44 while (!$end) {
45 switch ($stream->next()->getValue()) {
46 case 'else':
47 $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
48 $else = $this->parser->subparse([$this, 'decideIfEnd']);
49 break;
50
51 case 'elseif':
52 $expr = $this->parser->getExpressionParser()->parseExpression();
53 $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
54 $body = $this->parser->subparse([$this, 'decideIfFork']);
55 $tests[] = $expr;
56 $tests[] = $body;
57 break;
58
59 case 'endif':
60 $end = true;
61 break;
62
63 default:
64 throw new SyntaxError(sprintf('Unexpected end of template. Twig was looking for the following tags "else", "elseif", or "endif" to close the "if" block started at line %d).', $lineno), $stream->getCurrent()->getLine(), $stream->getSourceContext());
65 }
66 }
67
68 $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
69
70 return new IfNode(new Node($tests), $else, $lineno, $this->getTag());
71 }
72
73 public function decideIfFork(Token $token)
74 {
75 return $token->test(['elseif', 'else', 'endif']);
76 }
77
78 public function decideIfEnd(Token $token)
79 {
80 return $token->test(['endif']);
81 }
82
83 public function getTag()
84 {
85 return 'if';
86 }
87 }
88
89 class_alias('Twig\TokenParser\IfTokenParser', 'Twig_TokenParser_If');
90