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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 cssselector library, * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect. * * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com> / class TokenStream { /* * @var Token[] / private $tokens = array(); /* * @var boolean / private $frozen = false; /* * @var Token[] / private $used = array(); /* * @var int / private $cursor = 0; /* * @var Token\|null / private $peeked = null; /* * @var boolean / private $peeking = false; /* * Pushes a token. * * @param Token $token * * @return TokenStream / public function push(Token $token) { $this->tokens[] = $token; return $this; } /* * Freezes stream. * * @return TokenStream / public function freeze() { $this->frozen = true; return $this; } /* * Returns next token. * * @throws InternalErrorException If there is no more token * * @return Token / public function getNext() { if ($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. * * @return Token / public function getPeek() { if (!$this->peeking) { $this->peeked = $this->getNext(); $this->peeking = true; } return $this->peeked; } /* * Returns used tokens. * * @return Token[] / public function getUsed() { return $this->used; } /* * Returns nex identifier token. * * @throws SyntaxErrorException If next token is not an identifier * * @return string The identifier token value / public function getNextIdentifier() { $next = $this->getNext(); if (!$next->isIdentifier()) { throw SyntaxErrorException::unexpectedToken('identifier', $next); } return $next->getValue(); } /* * Returns nex identifier or star delimiter token. * * @throws SyntaxErrorException If next token is not an identifier or a star delimiter * * @return null\|string The identifier token value or null if star found / public function getNextIdentifierOrStar() { $next = $this->getNext(); if ($next->isIdentifier()) { return $next->getValue(); } if ($next->isDelimiter(array(''))) { return null; } throw SyntaxErrorException::unexpectedToken('identifier or ""', $next); } /* * Skips next whitespace if any. */ public function skipWhitespace() { $peek = $this->getPeek(); if ($peek->isWhitespace()) { $this->getNext(); } } }