function GuardTokenParser::parse

Overrides TokenParserInterface::parse

File

vendor/twig/twig/src/TokenParser/GuardTokenParser.php, line 25

Class

GuardTokenParser

@internal

Namespace

Twig\TokenParser

Code

public function parse(Token $token) : Node {
    $stream = $this->parser
        ->getStream();
    $typeToken = $stream->expect(Token::NAME_TYPE);
    if (!in_array($typeToken->getValue(), [
        'function',
        'filter',
        'test',
    ])) {
        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);
    $exists = null !== $this->parser
        ->getEnvironment()
        ->{$method}($nameToken->getValue());
    $stream->expect(Token::BLOCK_END_TYPE);
    if ($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,
    ]);
}