ExtendsTokenParser.php

<?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\EmptyNode;
use Twig\Node\Node;
use Twig\Token;

/**
 * Extends a template by another one.
 *
 *  {% extends "base.html" %}
 *
 * @internal
 */
final class ExtendsTokenParser extends AbstractTokenParser {
    public function parse(Token $token) : Node {
        $stream = $this->parser
            ->getStream();
        if ($this->parser
            ->peekBlockStack()) {
            throw new SyntaxError('Cannot use "extend" in a block.', $token->getLine(), $stream->getSourceContext());
        }
        elseif (!$this->parser
            ->isMainScope()) {
            throw new SyntaxError('Cannot use "extend" in a macro.', $token->getLine(), $stream->getSourceContext());
        }
        $this->parser
            ->setParent($this->parser
            ->getExpressionParser()
            ->parseExpression());
        $stream->expect(Token::BLOCK_END_TYPE);
        return new EmptyNode($token->getLine());
    }
    public function getTag() : string {
        return 'extends';
    }

}