<?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

About Section

About NFC Pay: Our Story and Mission

NFC Pay was founded with a vision to transform the way people handle transactions. Our journey is defined by a commitment to innovation, security, and convenience. We strive to deliver seamless, user-friendly payment solutions that make everyday transactions effortless and secure. Our mission is to empower you to pay with ease and confidence, anytime, anywhere.

• Simplifying Payments, One Tap at a Time.
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FAQ Section

Frequently Asked Questions About NFC Pay

Here are answers to some common questions about NFC Pay. We aim to provide clear and concise information to help you understand how our platform works and how it can benefit you. If you have any further inquiries, please don’t hesitate to contact our support team.

How do I register for NFC Pay?

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Is my payment information secure?

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Can I add multiple cards to my NFC Pay wallet?

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