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TypesTokenParser.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\Node;
use Twig\Node\TypesNode;
use Twig\Token;
use Twig\TokenStream;
/**
* Declare variable types.
*
* {% types {foo: 'int', bar?: 'string'} %}
*
* @author Jeroen Versteeg <jeroen@alisqi.com>
*
* @internal
*/
final class TypesTokenParser extends AbstractTokenParser
{
public function parse(Token $token): Node
{
$stream = $this->parser->getStream();
$types = $this->parseSimpleMappingExpression($stream);
$stream->expect(Token::BLOCK_END_TYPE);
return new TypesNode($types, $token->getLine());
}
/**
* @return array<string, array{type: string, optional: bool}>
*
* @throws SyntaxError
*/
private function parseSimpleMappingExpression(TokenStream $stream): array
{
$stream->expect(Token::PUNCTUATION_TYPE, '{', 'A mapping element was expected');
$types = [];
$first = true;
while (!$stream->test(Token::PUNCTUATION_TYPE, '}')) {
if (!$first) {
$stream->expect(Token::PUNCTUATION_TYPE, ',', 'A type string must be followed by a comma');
// trailing ,?
if ($stream->test(Token::PUNCTUATION_TYPE, '}')) {
break;
}
}
$first = false;
$nameToken = $stream->expect(Token::NAME_TYPE);
$isOptional = null !== $stream->nextIf(Token::PUNCTUATION_TYPE, '?');
$stream->expect(Token::PUNCTUATION_TYPE, ':', 'A type name must be followed by a colon (:)');
$valueToken = $stream->expect(Token::STRING_TYPE);
$types[$nameToken->getValue()] = [
'type' => $valueToken->getValue(),
'optional' => $isOptional,
];
}
$stream->expect(Token::PUNCTUATION_TYPE, '}', 'An opened mapping is not properly closed');
return $types;
}
public function getTag(): string
{
return 'types';
}
}

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