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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\EmptyNode; use Twig\Node\Node; use Twig\Node\Nodes; use Twig\Token; /** * @internal */ final class GuardTokenParser extends AbstractTokenParser { public function parse(Token $token): Node { $stream = $this->parser->getStream(); $typeToken = $stream->expect(Token::NAME_TYPE); if (!\in_array($typeToken->getValue(), ['function', 'filter', 'test'], true)) { throw new SyntaxError(\sprintf('Supported guard types are function, filter and test, "%s" given.', $typeToken->getValue()), $typeToken->getLine(), $stream->getSourceContext()); } $method = 'get'.$typeToken->getValue(); $nameToken = $stream->expect(Token::NAME_TYPE); try { $exists = null !== $this->parser->getEnvironment()->$method($nameToken->getValue()); } catch (SyntaxError) { $exists = false; } $stream->expect(Token::BLOCK_END_TYPE); if ($exists) { $body = $this->parser->subparse([$this, 'decideGuardFork']); } else { $body = new EmptyNode(); $this->parser->subparseIgnoreUnknownTwigCallables([$this, 'decideGuardFork']); } $else = new EmptyNode(); if ('else' === $stream->next()->getValue()) { $stream->expect(Token::BLOCK_END_TYPE); $else = $this->parser->subparse([$this, 'decideGuardEnd'], true); } $stream->expect(Token::BLOCK_END_TYPE); return new Nodes([$exists ? $body : $else]); } public function decideGuardFork(Token $token): bool { return $token->test(['else', 'endguard']); } public function decideGuardEnd(Token $token): bool { return $token->test(['endguard']); } public function getTag(): string { return 'guard'; } }
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