<?php

declare (strict_types=1);
/*
 * This file is part of the league/commonmark package.
 *
 * (c) Colin O'Dell <colinodell@gmail.com>
 *
 * Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
 *  - (c) John MacFarlane
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace ZOOlanders\YOOessentials\Vendor\League\CommonMark\Util;

use ZOOlanders\YOOessentials\Vendor\League\CommonMark\Parser\Cursor;
/**
 * @psalm-immutable
 */
final class LinkParserHelper
{
    /**
     * Attempt to parse link destination
     *
     * @return string|null The string, or null if no match
     */
    public static function parseLinkDestination(Cursor $cursor) : ?string
    {
        if ($cursor->getCurrentCharacter() === '<') {
            return self::parseDestinationBraces($cursor);
        }
        $destination = self::manuallyParseLinkDestination($cursor);
        if ($destination === null) {
            return null;
        }
        return UrlEncoder::unescapeAndEncode(RegexHelper::unescape($destination));
    }
    public static function parseLinkLabel(Cursor $cursor) : int
    {
        $match = $cursor->match('/^\\[(?:[^\\\\\\[\\]]|\\\\.){0,1000}\\]/');
        if ($match === null) {
            return 0;
        }
        $length = \mb_strlen($match, 'UTF-8');
        if ($length > 1001) {
            return 0;
        }
        return $length;
    }
    public static function parsePartialLinkLabel(Cursor $cursor) : ?string
    {
        return $cursor->match('/^(?:[^\\\\\\[\\]]++|\\\\.?)*+/');
    }
    /**
     * Attempt to parse link title (sans quotes)
     *
     * @return string|null The string, or null if no match
     */
    public static function parseLinkTitle(Cursor $cursor) : ?string
    {
        if ($title = $cursor->match('/' . RegexHelper::PARTIAL_LINK_TITLE . '/')) {
            // Chop off quotes from title and unescape
            return RegexHelper::unescape(\substr($title, 1, -1));
        }
        return null;
    }
    public static function parsePartialLinkTitle(Cursor $cursor, string $endDelimiter) : ?string
    {
        $endDelimiter = \preg_quote($endDelimiter, '/');
        $regex = \sprintf('/(%s|[^%s\\x00])*(?:%s)?/', RegexHelper::PARTIAL_ESCAPED_CHAR, $endDelimiter, $endDelimiter);
        if (($partialTitle = $cursor->match($regex)) === null) {
            return null;
        }
        return RegexHelper::unescape($partialTitle);
    }
    private static function manuallyParseLinkDestination(Cursor $cursor) : ?string
    {
        $remainder = $cursor->getRemainder();
        $openParens = 0;
        $len = \strlen($remainder);
        for ($i = 0; $i < $len; $i++) {
            $c = $remainder[$i];
            if ($c === '\\' && $i + 1 < $len && RegexHelper::isEscapable($remainder[$i + 1])) {
                $i++;
            } elseif ($c === '(') {
                $openParens++;
                // Limit to 32 nested parens for pathological cases
                if ($openParens > 32) {
                    return null;
                }
            } elseif ($c === ')') {
                if ($openParens < 1) {
                    break;
                }
                $openParens--;
            } elseif (\ord($c) <= 32 && RegexHelper::isWhitespace($c)) {
                break;
            }
        }
        if ($openParens !== 0) {
            return null;
        }
        if ($i === 0 && (!isset($c) || $c !== ')')) {
            return null;
        }
        $destination = \substr($remainder, 0, $i);
        $cursor->advanceBy(\mb_strlen($destination, 'UTF-8'));
        return $destination;
    }
    /** @var \WeakReference<Cursor>|null */
    private static ?\WeakReference $lastCursor = null;
    private static bool $lastCursorLacksClosingBrace = \false;
    private static function parseDestinationBraces(Cursor $cursor) : ?string
    {
        // Optimization: If we've previously parsed this cursor and returned `null`, we know
        // that no closing brace exists, so we can skip the regex entirely. This helps avoid
        // certain pathological cases where the regex engine can take a very long time to
        // determine that no match exists.
        if (self::$lastCursor !== null && self::$lastCursor->get() === $cursor) {
            if (self::$lastCursorLacksClosingBrace) {
                return null;
            }
        } else {
            self::$lastCursor = \WeakReference::create($cursor);
        }
        if ($res = $cursor->match(RegexHelper::REGEX_LINK_DESTINATION_BRACES)) {
            self::$lastCursorLacksClosingBrace = \false;
            // Chop off surrounding <..>:
            return UrlEncoder::unescapeAndEncode(RegexHelper::unescape(\substr($res, 1, -1)));
        }
        self::$lastCursorLacksClosingBrace = \true;
        return null;
    }
}
