| /vendor/symfony/css-selector/Parser/TokenStream.php |
|---|
| @@ -0,0 +1,184 @@ |
|---|
| <?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 $tokens = array(); |
| |
| /** |
| * @var bool |
| */ |
| private $frozen = false; |
| |
| /** |
| * @var Token[] |
| */ |
| private $used = array(); |
| |
| /** |
| * @var int |
| */ |
| private $cursor = 0; |
| |
| /** |
| * @var Token|null |
| */ |
| private $peeked = null; |
| |
| /** |
| * @var bool |
| */ |
| private $peeking = false; |
| |
| /** |
| * Pushes a token. |
| * |
| * @param Token $token |
| * |
| * @return $this |
| */ |
| public function push(Token $token) |
| { |
| $this->tokens[] = $token; |
| |
| return $this; |
| } |
| |
| /** |
| * Freezes stream. |
| * |
| * @return $this |
| */ |
| public function freeze() |
| { |
| $this->frozen = true; |
| |
| return $this; |
| } |
| |
| /** |
| * Returns next token. |
| * |
| * @return Token |
| * |
| * @throws InternalErrorException If there is no more token |
| */ |
| public function getNext() |
| { |
| if ($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. |
| * |
| * @return string The identifier token value |
| * |
| * @throws SyntaxErrorException If next token is not an identifier |
| */ |
| public function getNextIdentifier() |
| { |
| $next = $this->getNext(); |
| |
| if (!$next->isIdentifier()) { |
| throw SyntaxErrorException::unexpectedToken('identifier', $next); |
| } |
| |
| return $next->getValue(); |
| } |
| |
| /** |
| * Returns nex identifier or star delimiter token. |
| * |
| * @return null|string The identifier token value or null if star found |
| * |
| * @throws SyntaxErrorException If next token is not an identifier or a star delimiter |
| */ |
| public function getNextIdentifierOrStar() |
| { |
| $next = $this->getNext(); |
| |
| if ($next->isIdentifier()) { |
| return $next->getValue(); |
| } |
| |
| if ($next->isDelimiter(array('*'))) { |
| return; |
| } |
| |
| throw SyntaxErrorException::unexpectedToken('identifier or "*"', $next); |
| } |
| |
| /** |
| * Skips next whitespace if any. |
| */ |
| public function skipWhitespace() |
| { |
| $peek = $this->getPeek(); |
| |
| if ($peek->isWhitespace()) { |
| $this->getNext(); |
| } |
| } |
| } |
