Source of file TokenStream.php
Size: 3,665 Bytes - Last Modified: 2013-07-17T08:22:21+02:00
/home/theseer/Downloads/Symfony/vendor/symfony/symfony/src/Symfony/Component/CssSelector/Parser/TokenStream.php
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183 | <?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(); } } } |