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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\CssSelector\Parser; use Symfony\Component\CssSelector\Exception\InternalErrorException; use Symfony\Component\CssSelector\Exception\SyntaxErrorException; /** * CSS selector token stream. * * This component is a port of the Python cssselect library, * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect. * * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com> * * @internal */ class TokenStream { /** * @var Token[] */ private array $tokens = []; /** * @var Token[] */ private array $used = []; private int $cursor = 0; private ?Token $peeked; private bool $peeking = false; /** * Pushes a token. * * @return $this */ public function push(Token $token): static { $this->tokens[] = $token; return $this; } /** * Freezes stream. * * @return $this */ public function freeze(): static { return $this; } /** * Returns next token. * * @throws InternalErrorException If there is no more token */ public function getNext(): Token { if ($this->peeking) { $this->peeking = false; $this->used[] = $this->peeked; return $this->peeked; } if (!isset($this->tokens[$this->cursor])) { throw new InternalErrorException('Unexpected token stream end.'); } return $this->tokens[$this->cursor++]; } /** * Returns peeked token. */ public function getPeek(): Token { if (!$this->peeking) { $this->peeked = $this->getNext(); $this->peeking = true; } return $this->peeked; } /** * Returns used tokens. * * @return Token[] */ public function getUsed(): array { return $this->used; } /** * Returns next identifier token. * * @throws SyntaxErrorException If next token is not an identifier */ public function getNextIdentifier(): string { $next = $this->getNext(); if (!$next->isIdentifier()) { throw SyntaxErrorException::unexpectedToken('identifier', $next); } return $next->getValue(); } /** * Returns next identifier or null if star delimiter token is found. * * @throws SyntaxErrorException If next token is not an identifier or a star delimiter */ public function getNextIdentifierOrStar(): ?string { $next = $this->getNext(); if ($next->isIdentifier()) { return $next->getValue(); } if ($next->isDelimiter(['*'])) { return null; } throw SyntaxErrorException::unexpectedToken('identifier or "*"', $next); } /** * Skips next whitespace if any. */ public function skipWhitespace(): void { $peek = $this->getPeek(); if ($peek->isWhitespace()) { $this->getNext(); } } }