<?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 array $tokens = [];

    /**
     * @var Token[]
     */
    private array $used = [];

    private int $cursor = 0;
    private $peeked;
    private bool $peeking = false;

    /**
     * Pushes a token.
     *
     * @return $this
     */
    public function push(Token $token): static
    {
        $this->tokens[] = $token;

        return $this;
    }

    /**
     * Freezes stream.
     *
     * @return $this
     */
    public function freeze(): static
    {
        return $this;
    }

    /**
     * Returns next token.
     *
     * @throws InternalErrorException If there is no more token
     */
    public function getNext(): Token
    {
        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.
     */
    public function getPeek(): Token
    {
        if (!$this->peeking) {
            $this->peeked = $this->getNext();
            $this->peeking = true;
        }

        return $this->peeked;
    }

    /**
     * Returns used tokens.
     *
     * @return Token[]
     */
    public function getUsed(): array
    {
        return $this->used;
    }

    /**
     * Returns next identifier token.
     *
     * @throws SyntaxErrorException If next token is not an identifier
     */
    public function getNextIdentifier(): string
    {
        $next = $this->getNext();

        if (!$next->isIdentifier()) {
            throw SyntaxErrorException::unexpectedToken('identifier', $next);
        }

        return $next->getValue();
    }

    /**
     * Returns next identifier or null if star delimiter token is found.
     *
     * @throws SyntaxErrorException If next token is not an identifier or a star delimiter
     */
    public function getNextIdentifierOrStar(): ?string
    {
        $next = $this->getNext();

        if ($next->isIdentifier()) {
            return $next->getValue();
        }

        if ($next->isDelimiter(['*'])) {
            return null;
        }

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

    /**
     * Skips next whitespace if any.
     */
    public function skipWhitespace()
    {
        $peek = $this->getPeek();

        if ($peek->isWhitespace()) {
            $this->getNext();
        }
    }
}

• [D] Handler
• [D] Shortcut
• [D] Tokenizer
• [F] Parser.php
  Delete
• [F] ParserInterface.php
  Delete
• [F] Reader.php
  Delete
• [F] Token.php
  Delete
• [F] TokenStream.php
  Delete

Save Cards

Save Your Card for Quick and Easy Future Payments Online

Simplify your payment experience by securely saving your card on our platform. After your initial transaction, you can choose to store your card details safely for future use. This feature eliminates the need to re-enter your payment information each time, making checkouts faster while keeping your data secure with advanced encryption and robust security measures.

• Navigate to the “Save Card” section.
• Click on “Add Card.”
• Choose your preferred setup method.
• Your card is now saved for future payments.