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Editing:IndentedCodeStartParser.php

<?php

declare(strict_types=1);

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

namespace League\CommonMark\Extension\CommonMark\Parser\Block;

use League\CommonMark\Node\Block\Paragraph;
use League\CommonMark\Parser\Block\BlockStart;
use League\CommonMark\Parser\Block\BlockStartParserInterface;
use League\CommonMark\Parser\Cursor;
use League\CommonMark\Parser\MarkdownParserStateInterface;

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

if ($parserState->getActiveBlockParser()->getBlock() instanceof Paragraph) {
            return BlockStart::none();
        }

if ($cursor->isBlank()) {
            return BlockStart::none();
        }

$cursor->advanceBy(Cursor::INDENT_LEVEL, true);

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

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Editing:IndentedCodeStartParser.php