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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 $cursor): ?string
    {
        if ($res = $cursor->match(RegexHelper::REGEX_LINK_DESTINATION_BRACES)) {
            // Chop off surrounding <..>:
            return UrlEncoder::unescapeAndEncode(
                RegexHelper::unescape(\substr($res, 1, -1))
            );
        }

if ($cursor->getCurrentCharacter() === '<') {
            return null;
        }

$destination = self::manuallyParseLinkDestination($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
    {
        $oldPosition = $cursor->getPosition();
        $oldState    = $cursor->saveState();

$openParens = 0;
        while (($c = $cursor->getCurrentCharacter()) !== null) {
            if ($c === '\\' && ($peek = $cursor->peek()) !== null && RegexHelper::isEscapable($peek)) {
                $cursor->advanceBy(2);
            } elseif ($c === '(') {
                $cursor->advanceBy(1);
                $openParens++;
            } elseif ($c === ')') {
                if ($openParens < 1) {
                    break;
                }

$cursor->advanceBy(1);
                $openParens--;
            } elseif (\preg_match(RegexHelper::REGEX_WHITESPACE_CHAR, $c)) {
                break;
            } else {
                $cursor->advanceBy(1);
            }
        }

if ($openParens !== 0) {
            return null;
        }

if ($cursor->getPosition() === $oldPosition && (! isset($c) || $c !== ')')) {
            return null;
        }

$newPos = $cursor->getPosition();
        $cursor->restoreState($oldState);

$cursor->advanceBy($newPos - $cursor->getPosition());

return $cursor->getPreviousText();
    }
}

Name	Size	Permission
ArrayCollection.php	3476 bytes	0775
Html5EntityDecoder.php	1815 bytes	0775
HtmlElement.php	4140 bytes	0775
HtmlFilter.php	1468 bytes	0775
LinkParserHelper.php	4010 bytes	0775
PrioritizedList.php	1641 bytes	0775
RegexHelper.php	10257 bytes	0775
SpecReader.php	2176 bytes	0775
UrlEncoder.php	2619 bytes	0775
Xml.php	738 bytes	0775

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