D7net
Home
Console
Upload
information
Create File
Create Folder
About
Tools
:
/
opt
/
alt
/
php54
/
usr
/
share
/
pear
/
Symfony
/
Component
/
CssSelector
/
Parser
/
Filename :
TokenStream.php
back
Copy
<?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(); } } }