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File Content: `LinkParserHelper.php`

<?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 League\CommonMark\Util;

use 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;
    }
}

Name	Size	Permission
ArrayCollection.php	3476 bytes	0755
Html5EntityDecoder.php	1815 bytes	0755
HtmlElement.php	4140 bytes	0755
HtmlFilter.php	1468 bytes	0755
LinkParserHelper.php	4942 bytes	0755
PrioritizedList.php	1641 bytes	0755
RegexHelper.php	10399 bytes	0755
SpecReader.php	2237 bytes	0755
UrlEncoder.php	2619 bytes	0755
Xml.php	738 bytes	0755

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File Content: LinkParserHelper.php

File Content: `LinkParserHelper.php`