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TokenParser
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UseTokenParser.php
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<?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\TokenParser; use Twig\Error\SyntaxError; use Twig\Node\Expression\ConstantExpression; use Twig\Node\Node; use Twig\Token; /** * Imports blocks defined in another template into the current template. * * {% extends "base.html" %} * * {% use "blocks.html" %} * * {% block title %}{% endblock %} * {% block content %}{% endblock %} * * @see https://twig.symfony.com/doc/templates.html#horizontal-reuse for details. * * @internal */ final class UseTokenParser extends AbstractTokenParser { public function parse(Token $token): Node { $template = $this->parser->getExpressionParser()->parseExpression(); $stream = $this->parser->getStream(); if (!$template instanceof ConstantExpression) { throw new SyntaxError('The template references in a "use" statement must be a string.', $stream->getCurrent()->getLine(), $stream->getSourceContext()); } $targets = []; if ($stream->nextIf('with')) { do { $name = $stream->expect(/* Token::NAME_TYPE */ 5)->getValue(); $alias = $name; if ($stream->nextIf('as')) { $alias = $stream->expect(/* Token::NAME_TYPE */ 5)->getValue(); } $targets[$name] = new ConstantExpression($alias, -1); if (!$stream->nextIf(/* Token::PUNCTUATION_TYPE */ 9, ',')) { break; } } while (true); } $stream->expect(/* Token::BLOCK_END_TYPE */ 3); $this->parser->addTrait(new Node(['template' => $template, 'targets' => new Node($targets)])); return new Node(); } public function getTag(): string { return 'use'; } }