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- Veröffentlicht
- 28.08.2024
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BlockTokenParser.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\BlockNode;
17 use Twig\Node\BlockReferenceNode;
18 use Twig\Node\Node;
19 use Twig\Node\PrintNode;
20 use Twig\Token;
21
22 /**
23 * Marks a section of a template as being reusable.
24 *
25 * {% block head %}
26 * <link rel="stylesheet" href="style.css" />
27 * <title>{% block title %}{% endblock %} - My Webpage</title>
28 * {% endblock %}
29 */
30 final class BlockTokenParser extends AbstractTokenParser
31 {
32 public function parse(Token $token)
33 {
34 $lineno = $token->getLine();
35 $stream = $this->parser->getStream();
36 $name = $stream->expect(/* Token::NAME_TYPE */ 5)->getValue();
37 if ($this->parser->hasBlock($name)) {
38 throw new SyntaxError(sprintf("The block '%s' has already been defined line %d.", $name, $this->parser->getBlock($name)->getTemplateLine()), $stream->getCurrent()->getLine(), $stream->getSourceContext());
39 }
40 $this->parser->setBlock($name, $block = new BlockNode($name, new Node([]), $lineno));
41 $this->parser->pushLocalScope();
42 $this->parser->pushBlockStack($name);
43
44 if ($stream->nextIf(/* Token::BLOCK_END_TYPE */ 3)) {
45 $body = $this->parser->subparse([$this, 'decideBlockEnd'], true);
46 if ($token = $stream->nextIf(/* Token::NAME_TYPE */ 5)) {
47 $value = $token->getValue();
48
49 if ($value != $name) {
50 throw new SyntaxError(sprintf('Expected endblock for block "%s" (but "%s" given).', $name, $value), $stream->getCurrent()->getLine(), $stream->getSourceContext());
51 }
52 }
53 } else {
54 $body = new Node([
55 new PrintNode($this->parser->getExpressionParser()->parseExpression(), $lineno),
56 ]);
57 }
58 $stream->expect(/* Token::BLOCK_END_TYPE */ 3);
59
60 $block->setNode('body', $body);
61 $this->parser->popBlockStack();
62 $this->parser->popLocalScope();
63
64 return new BlockReferenceNode($name, $lineno, $this->getTag());
65 }
66
67 public function decideBlockEnd(Token $token)
68 {
69 return $token->test('endblock');
70 }
71
72 public function getTag()
73 {
74 return 'block';
75 }
76 }
77
78 class_alias('Twig\TokenParser\BlockTokenParser', 'Twig_TokenParser_Block');
79