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Edit File : LinkParserHelper.php \| Size : 3.31 KB
<?php /* * 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\Cursor; final class LinkParserHelper { /* * Attempt to parse link destination * * @param Cursor $cursor * * @return null\|string 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->getCharacter() === '<') { 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; } /* * Attempt to parse link title (sans quotes) * * @param Cursor $cursor * * @return null\|string 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; } private static function manuallyParseLinkDestination(Cursor $cursor): ?string { $oldPosition = $cursor->getPosition(); $oldState = $cursor->saveState(); $openParens = 0; while (($c = $cursor->getCharacter()) !== null) { if ($c === '\\' && $cursor->peek() !== null && RegexHelper::isEscapable($cursor->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 && $c !== ')') { return null; } $newPos = $cursor->getPosition(); $cursor->restoreState($oldState); $cursor->advanceBy($newPos - $cursor->getPosition()); return $cursor->getPreviousText(); } } Back

Edit File : LinkParserHelper.php | Size : 3.31 KB

<?php

/*
 * 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\Cursor;

final class LinkParserHelper
{
    /**
     * Attempt to parse link destination
     *
     * @param Cursor $cursor
     *
     * @return null|string 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->getCharacter() === '<') {
            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;
    }

/**
     * Attempt to parse link title (sans quotes)
     *
     * @param Cursor $cursor
     *
     * @return null|string 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;
    }

private static function manuallyParseLinkDestination(Cursor $cursor): ?string
    {
        $oldPosition = $cursor->getPosition();
        $oldState = $cursor->saveState();

$openParens = 0;
        while (($c = $cursor->getCharacter()) !== null) {
            if ($c === '\\' && $cursor->peek() !== null && RegexHelper::isEscapable($cursor->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 && $c !== ')') {
            return null;
        }

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

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

return $cursor->getPreviousText();
    }
}

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