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<?php

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* This file is part of the Symfony package.

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* (c) Fabien Potencier <fabien@symfony.com>

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* For the full copyright and license information, please view the LICENSE

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* file that was distributed with this source code.

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namespace WPForms\Vendor\Symfony\Component\CssSelector\Parser;

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use WPForms\Vendor\Symfony\Component\CssSelector\Exception\InternalErrorException;

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use WPForms\Vendor\Symfony\Component\CssSelector\Exception\SyntaxErrorException;

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/**

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* CSS selector token stream.

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* This component is a port of the Python cssselect library,

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* which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.

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* @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>

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* @internal

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class TokenStream

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{

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/**

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* @var Token[]

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private $tokens = array();

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/**

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* @var bool

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private $frozen = \false;

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/**

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* @var Token[]

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private $used = array();

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/**

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* @var int

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private $cursor = 0;

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/**

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* @var Token|null

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private $peeked = null;

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/**

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* @var bool

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private $peeking = \false;

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/**

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* Pushes a token.

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* @param Token $token

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* @return $this

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public function push(Token $token)

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{

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$this->tokens[] = $token;

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return $this;

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}

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/**

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* Freezes stream.

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* @return $this

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public function freeze()

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{

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$this->frozen = \true;

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return $this;

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}

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/**

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* Returns next token.

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* @return Token

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* @throws InternalErrorException If there is no more token

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public function getNext()

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{

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if ($this->peeking) {

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$this->peeking = \false;

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$this->used[] = $this->peeked;

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return $this->peeked;

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}

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if (!isset($this->tokens[$this->cursor])) {

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throw new InternalErrorException('Unexpected token stream end.');

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}

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return $this->tokens[$this->cursor++];

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}

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/**

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* Returns peeked token.

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* @return Token

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public function getPeek()

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{

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if (!$this->peeking) {

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$this->peeked = $this->getNext();

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$this->peeking = \true;

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}

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return $this->peeked;

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}

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/**

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* Returns used tokens.

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* @return Token[]

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public function getUsed()

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{

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return $this->used;

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}

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/**

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* Returns nex identifier token.

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* @return string The identifier token value

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* @throws SyntaxErrorException If next token is not an identifier

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public function getNextIdentifier()

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{

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$next = $this->getNext();

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if (!$next->isIdentifier()) {

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throw SyntaxErrorException::unexpectedToken('identifier', $next);

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}

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return $next->getValue();

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}

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/**

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* Returns nex identifier or star delimiter token.

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* @return null|string The identifier token value or null if star found

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* @throws SyntaxErrorException If next token is not an identifier or a star delimiter

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public function getNextIdentifierOrStar()

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{

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$next = $this->getNext();

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if ($next->isIdentifier()) {

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return $next->getValue();

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}

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if ($next->isDelimiter(array('*'))) {

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return;

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}

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throw SyntaxErrorException::unexpectedToken('identifier or "*"', $next);

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}

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/**

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* Skips next whitespace if any.

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public function skipWhitespace()

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{

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$peek = $this->getPeek();

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if ($peek->isWhitespace()) {

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$this->getNext();

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}

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}

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}

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