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Edit File: FootnoteStartParser.php

<?php

/*
 * This file is part of the league/commonmark package.
 *
 * (c) Colin O'Dell <colinodell@gmail.com>
 * (c) Rezo Zero / Ambroise Maupate
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace League\CommonMark\Extension\Footnote\Parser;

use League\CommonMark\Parser\Block\BlockStart;
use League\CommonMark\Parser\Block\BlockStartParserInterface;
use League\CommonMark\Parser\Cursor;
use League\CommonMark\Parser\MarkdownParserStateInterface;
use League\CommonMark\Reference\Reference;
use League\CommonMark\Util\RegexHelper;

final class FootnoteStartParser implements BlockStartParserInterface
{
    public function tryStart(Cursor $cursor, MarkdownParserStateInterface $parserState): ?BlockStart
    {
        if ($cursor->isIndented() || $parserState->getLastMatchedBlockParser()->canHaveLazyContinuationLines()) {
            return BlockStart::none();
        }

$match = RegexHelper::matchFirst(
            '/^\[\^([^\s^\]]+)\]\:(?:\s|$)/',
            $cursor->getLine(),
            $cursor->getNextNonSpacePosition()
        );

if (! $match) {
            return BlockStart::none();
        }

$cursor->advanceToNextNonSpaceOrTab();
        $cursor->advanceBy(\strlen($match[0]));
        $str = $cursor->getRemainder();
        \preg_replace('/^\[\^([^\s^\]]+)\]\:(?:\s|$)/', '', $str);

if (\preg_match('/^\[\^([^\s^\]]+)\]\:(?:\s|$)/', $match[0], $matches) !== 1) {
            return BlockStart::none();
        }

$reference      = new Reference($matches[1], $matches[1], $matches[1]);
        $footnoteParser = new FootnoteParser($reference);

return BlockStart::of($footnoteParser)->at($cursor);
    }
}

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