74 lines
2.0 KiB
PHP
74 lines
2.0 KiB
PHP
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<?php
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/*
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* This file is part of Twig.
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*
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* (c) Fabien Potencier
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Twig\TokenParser;
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use Twig\Error\SyntaxError;
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use Twig\Node\EmptyNode;
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use Twig\Node\Node;
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use Twig\Node\Nodes;
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use Twig\Token;
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/**
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* @internal
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*/
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final class GuardTokenParser extends AbstractTokenParser
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{
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public function parse(Token $token): Node
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{
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$stream = $this->parser->getStream();
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$typeToken = $stream->expect(Token::NAME_TYPE);
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if (!\in_array($typeToken->getValue(), ['function', 'filter', 'test'])) {
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throw new SyntaxError(\sprintf('Supported guard types are function, filter and test, "%s" given.', $typeToken->getValue()), $typeToken->getLine(), $stream->getSourceContext());
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}
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$method = 'get'.$typeToken->getValue();
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$nameToken = $stream->expect(Token::NAME_TYPE);
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try {
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$exists = null !== $this->parser->getEnvironment()->$method($nameToken->getValue());
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} catch (SyntaxError) {
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$exists = false;
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}
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$stream->expect(Token::BLOCK_END_TYPE);
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if ($exists) {
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$body = $this->parser->subparse([$this, 'decideGuardFork']);
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} else {
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$body = new EmptyNode();
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$this->parser->subparseIgnoreUnknownTwigCallables([$this, 'decideGuardFork']);
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}
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$else = new EmptyNode();
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if ('else' === $stream->next()->getValue()) {
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$stream->expect(Token::BLOCK_END_TYPE);
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$else = $this->parser->subparse([$this, 'decideGuardEnd'], true);
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}
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$stream->expect(Token::BLOCK_END_TYPE);
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return new Nodes([$exists ? $body : $else]);
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}
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public function decideGuardFork(Token $token): bool
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{
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return $token->test(['else', 'endguard']);
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}
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public function decideGuardEnd(Token $token): bool
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{
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return $token->test(['endguard']);
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}
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public function getTag(): string
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{
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return 'guard';
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}
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}
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