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Editing:MarkDelimiterProcessor.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\Highlight;

use League\CommonMark\Delimiter\DelimiterInterface;
use League\CommonMark\Delimiter\Processor\DelimiterProcessorInterface;
use League\CommonMark\Node\Inline\AbstractStringContainer;

class MarkDelimiterProcessor implements DelimiterProcessorInterface
{
    public function getOpeningCharacter(): string
    {
        return '=';
    }

public function getClosingCharacter(): string
    {
        return '=';
    }

public function getMinLength(): int
    {
        return 2;
    }

public function getDelimiterUse(DelimiterInterface $opener, DelimiterInterface $closer): int
    {
        if ($opener->getLength() > 2 && $closer->getLength() > 2) {
            return 0;
        }

if ($opener->getLength() !== $closer->getLength()) {
            return 0;
        }

// $opener and $closer are the same length so we just return one of them
        return $opener->getLength();
    }

public function process(AbstractStringContainer $opener, AbstractStringContainer $closer, int $delimiterUse): void
    {
        $mark = new Mark(\str_repeat('=', $delimiterUse));

$next = $opener->next();
        while ($next !== null && $next !== $closer) {
            $tmp = $next->next();
            $mark->appendChild($next);
            $next = $tmp;
        }

$opener->insertAfter($mark);
    }

public function getCacheKey(DelimiterInterface $closer): string
    {
        return '=' . $closer->getLength();
    }
}

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Editing:MarkDelimiterProcessor.php