vendor/twig/twig/src/TokenParser/BlockTokenParser.php line 42
<?php/** This file is part of Twig.** (c) Fabien Potencier* (c) Armin Ronacher** For the full copyright and license information, please view the LICENSE* file that was distributed with this source code.*/namespace Twig\TokenParser;use Twig\Error\SyntaxError;use Twig\Node\BlockNode;use Twig\Node\BlockReferenceNode;use Twig\Node\Node;use Twig\Node\PrintNode;use Twig\Token;/*** Marks a section of a template as being reusable.** {% block head %}* <link rel="stylesheet" href="style.css" />* <title>{% block title %}{% endblock %} - My Webpage</title>* {% endblock %}** @internal*/final class BlockTokenParser extends AbstractTokenParser{public function parse(Token $token): Node{$lineno = $token->getLine();$stream = $this->parser->getStream();$name = $stream->expect(/* Token::NAME_TYPE */ 5)->getValue();if ($this->parser->hasBlock($name)) {throw new SyntaxError(sprintf("The block '%s' has already been defined line %d.", $name, $this->parser->getBlock($name)->getTemplateLine()), $stream->getCurrent()->getLine(), $stream->getSourceContext());}$this->parser->setBlock($name, $block = new BlockNode($name, new Node([]), $lineno));$this->parser->pushLocalScope();$this->parser->pushBlockStack($name);if ($stream->nextIf(/* Token::BLOCK_END_TYPE */ 3)) {$body = $this->parser->subparse([$this, 'decideBlockEnd'], true);if ($token = $stream->nextIf(/* Token::NAME_TYPE */ 5)) {$value = $token->getValue();if ($value != $name) {throw new SyntaxError(sprintf('Expected endblock for block "%s" (but "%s" given).', $name, $value), $stream->getCurrent()->getLine(), $stream->getSourceContext());}}} else {$body = new Node([new PrintNode($this->parser->getExpressionParser()->parseExpression(), $lineno),]);}$stream->expect(/* Token::BLOCK_END_TYPE */ 3);$block->setNode('body', $body);$this->parser->popBlockStack();$this->parser->popLocalScope();return new BlockReferenceNode($name, $lineno, $this->getTag());}public function decideBlockEnd(Token $token): bool{return $token->test('endblock');}public function getTag(): string{return 'block';}}