<?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\SyntaxErrorException;
use Symfony\Component\CssSelector\Node;
use Symfony\Component\CssSelector\Parser\Tokenizer\Tokenizer;

/**
 * CSS selector parser.
 *
 * 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 Parser implements ParserInterface
{
    private $tokenizer;

    public function __construct(Tokenizer $tokenizer = null)
    {
        $this->tokenizer = $tokenizer ?? new Tokenizer();
    }

    /**
     * {@inheritdoc}
     */
    public function parse(string $source): array
    {
        $reader = new Reader($source);
        $stream = $this->tokenizer->tokenize($reader);

        return $this->parseSelectorList($stream);
    }

    /**
     * Parses the arguments for ":nth-child()" and friends.
     *
     * @param Token[] $tokens
     *
     * @throws SyntaxErrorException
     */
    public static function parseSeries(array $tokens): array
    {
        foreach ($tokens as $token) {
            if ($token->isString()) {
                throw SyntaxErrorException::stringAsFunctionArgument();
            }
        }

        $joined = trim(implode('', array_map(function (Token $token) {
            return $token->getValue();
        }, $tokens)));

        $int = function ($string) {
            if (!is_numeric($string)) {
                throw SyntaxErrorException::stringAsFunctionArgument();
            }

            return (int) $string;
        };

        switch (true) {
            case 'odd' === $joined:
                return [2, 1];
            case 'even' === $joined:
                return [2, 0];
            case 'n' === $joined:
                return [1, 0];
            case !str_contains($joined, 'n'):
                return [0, $int($joined)];
        }

        $split = explode('n', $joined);
        $first = $split[0] ?? null;

        return [
            $first ? ('-' === $first || '+' === $first ? $int($first.'1') : $int($first)) : 1,
            isset($split[1]) && $split[1] ? $int($split[1]) : 0,
        ];
    }

    private function parseSelectorList(TokenStream $stream): array
    {
        $stream->skipWhitespace();
        $selectors = [];

        while (true) {
            $selectors[] = $this->parserSelectorNode($stream);

            if ($stream->getPeek()->isDelimiter([','])) {
                $stream->getNext();
                $stream->skipWhitespace();
            } else {
                break;
            }
        }

        return $selectors;
    }

    private function parserSelectorNode(TokenStream $stream): Node\SelectorNode
    {
        [$result, $pseudoElement] = $this->parseSimpleSelector($stream);

        while (true) {
            $stream->skipWhitespace();
            $peek = $stream->getPeek();

            if ($peek->isFileEnd() || $peek->isDelimiter([','])) {
                break;
            }

            if (null !== $pseudoElement) {
                throw SyntaxErrorException::pseudoElementFound($pseudoElement, 'not at the end of a selector');
            }

            if ($peek->isDelimiter(['+', '>', '~'])) {
                $combinator = $stream->getNext()->getValue();
                $stream->skipWhitespace();
            } else {
                $combinator = ' ';
            }

            [$nextSelector, $pseudoElement] = $this->parseSimpleSelector($stream);
            $result = new Node\CombinedSelectorNode($result, $combinator, $nextSelector);
        }

        return new Node\SelectorNode($result, $pseudoElement);
    }

    /**
     * Parses next simple node (hash, class, pseudo, negation).
     *
     * @throws SyntaxErrorException
     */
    private function parseSimpleSelector(TokenStream $stream, bool $insideNegation = false): array
    {
        $stream->skipWhitespace();

        $selectorStart = \count($stream->getUsed());
        $result = $this->parseElementNode($stream);
        $pseudoElement = null;

        while (true) {
            $peek = $stream->getPeek();
            if ($peek->isWhitespace()
                || $peek->isFileEnd()
                || $peek->isDelimiter([',', '+', '>', '~'])
                || ($insideNegation && $peek->isDelimiter([')']))
            ) {
                break;
            }

            if (null !== $pseudoElement) {
                throw SyntaxErrorException::pseudoElementFound($pseudoElement, 'not at the end of a selector');
            }

            if ($peek->isHash()) {
                $result = new Node\HashNode($result, $stream->getNext()->getValue());
            } elseif ($peek->isDelimiter(['.'])) {
                $stream->getNext();
                $result = new Node\ClassNode($result, $stream->getNextIdentifier());
            } elseif ($peek->isDelimiter(['['])) {
                $stream->getNext();
                $result = $this->parseAttributeNode($result, $stream);
            } elseif ($peek->isDelimiter([':'])) {
                $stream->getNext();

                if ($stream->getPeek()->isDelimiter([':'])) {
                    $stream->getNext();
                    $pseudoElement = $stream->getNextIdentifier();

                    continue;
                }

                $identifier = $stream->getNextIdentifier();
                if (\in_array(strtolower($identifier), ['first-line', 'first-letter', 'before', 'after'])) {
                    // Special case: CSS 2.1 pseudo-elements can have a single ':'.
                    // Any new pseudo-element must have two.
                    $pseudoElement = $identifier;

                    continue;
                }

                if (!$stream->getPeek()->isDelimiter(['('])) {
                    $result = new Node\PseudoNode($result, $identifier);

                    continue;
                }

                $stream->getNext();
                $stream->skipWhitespace();

                if ('not' === strtolower($identifier)) {
                    if ($insideNegation) {
                        throw SyntaxErrorException::nestedNot();
                    }

                    [$argument, $argumentPseudoElement] = $this->parseSimpleSelector($stream, true);
                    $next = $stream->getNext();

                    if (null !== $argumentPseudoElement) {
                        throw SyntaxErrorException::pseudoElementFound($argumentPseudoElement, 'inside ::not()');
                    }

                    if (!$next->isDelimiter([')'])) {
                        throw SyntaxErrorException::unexpectedToken('")"', $next);
                    }

                    $result = new Node\NegationNode($result, $argument);
                } else {
                    $arguments = [];
                    $next = null;

                    while (true) {
                        $stream->skipWhitespace();
                        $next = $stream->getNext();

                        if ($next->isIdentifier()
                            || $next->isString()
                            || $next->isNumber()
                            || $next->isDelimiter(['+', '-'])
                        ) {
                            $arguments[] = $next;
                        } elseif ($next->isDelimiter([')'])) {
                            break;
                        } else {
                            throw SyntaxErrorException::unexpectedToken('an argument', $next);
                        }
                    }

                    if (empty($arguments)) {
                        throw SyntaxErrorException::unexpectedToken('at least one argument', $next);
                    }

                    $result = new Node\FunctionNode($result, $identifier, $arguments);
                }
            } else {
                throw SyntaxErrorException::unexpectedToken('selector', $peek);
            }
        }

        if (\count($stream->getUsed()) === $selectorStart) {
            throw SyntaxErrorException::unexpectedToken('selector', $stream->getPeek());
        }

        return [$result, $pseudoElement];
    }

    private function parseElementNode(TokenStream $stream): Node\ElementNode
    {
        $peek = $stream->getPeek();

        if ($peek->isIdentifier() || $peek->isDelimiter(['*'])) {
            if ($peek->isIdentifier()) {
                $namespace = $stream->getNext()->getValue();
            } else {
                $stream->getNext();
                $namespace = null;
            }

            if ($stream->getPeek()->isDelimiter(['|'])) {
                $stream->getNext();
                $element = $stream->getNextIdentifierOrStar();
            } else {
                $element = $namespace;
                $namespace = null;
            }
        } else {
            $element = $namespace = null;
        }

        return new Node\ElementNode($namespace, $element);
    }

    private function parseAttributeNode(Node\NodeInterface $selector, TokenStream $stream): Node\AttributeNode
    {
        $stream->skipWhitespace();
        $attribute = $stream->getNextIdentifierOrStar();

        if (null === $attribute && !$stream->getPeek()->isDelimiter(['|'])) {
            throw SyntaxErrorException::unexpectedToken('"|"', $stream->getPeek());
        }

        if ($stream->getPeek()->isDelimiter(['|'])) {
            $stream->getNext();

            if ($stream->getPeek()->isDelimiter(['='])) {
                $namespace = null;
                $stream->getNext();
                $operator = '|=';
            } else {
                $namespace = $attribute;
                $attribute = $stream->getNextIdentifier();
                $operator = null;
            }
        } else {
            $namespace = $operator = null;
        }

        if (null === $operator) {
            $stream->skipWhitespace();
            $next = $stream->getNext();

            if ($next->isDelimiter([']'])) {
                return new Node\AttributeNode($selector, $namespace, $attribute, 'exists', null);
            } elseif ($next->isDelimiter(['='])) {
                $operator = '=';
            } elseif ($next->isDelimiter(['^', '$', '*', '~', '|', '!'])
                && $stream->getPeek()->isDelimiter(['='])
            ) {
                $operator = $next->getValue().'=';
                $stream->getNext();
            } else {
                throw SyntaxErrorException::unexpectedToken('operator', $next);
            }
        }

        $stream->skipWhitespace();
        $value = $stream->getNext();

        if ($value->isNumber()) {
            // if the value is a number, it's casted into a string
            $value = new Token(Token::TYPE_STRING, (string) $value->getValue(), $value->getPosition());
        }

        if (!($value->isIdentifier() || $value->isString())) {
            throw SyntaxErrorException::unexpectedToken('string or identifier', $value);
        }

        $stream->skipWhitespace();
        $next = $stream->getNext();

        if (!$next->isDelimiter([']'])) {
            throw SyntaxErrorException::unexpectedToken('"]"', $next);
        }

        return new Node\AttributeNode($selector, $namespace, $attribute, $operator, $value->getValue());
    }
}

• [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

How To Payment

Simple Steps to Complete Your Payment Securely and Efficiently

Making a payment on our website is quick and secure. Start by logging in or creating an account. Select your preferred payment method, input the required details, and review the information. Once you confirm everything is correct, click on the "Submit Payment" button. You’ll receive instant confirmation and can track your payment status through your account dashboard. It’s an easy and secure process.

• Go to the Payment Section: Access the payment area on our website or app.
• Choose Your Payment Method: Select your preferred payment option.
• Enter Payment Details: Provide the necessary payment information.
• Verify Your Information: Check that all details are correct.
• Confirm Your Payment: Click "Submit Payment" to complete the transaction.