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Edit File: HeadingRenderer.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\Extension\CommonMark\Renderer\Block;

use League\CommonMark\Extension\CommonMark\Node\Block\Heading;
use League\CommonMark\Node\Node;
use League\CommonMark\Renderer\ChildNodeRendererInterface;
use League\CommonMark\Renderer\NodeRendererInterface;
use League\CommonMark\Util\HtmlElement;
use League\CommonMark\Xml\XmlNodeRendererInterface;

final class HeadingRenderer implements NodeRendererInterface, XmlNodeRendererInterface
{
    /**
     * @param Heading $node
     *
     * {@inheritDoc}
     *
     * @psalm-suppress MoreSpecificImplementedParamType
     */
    public function render(Node $node, ChildNodeRendererInterface $childRenderer): \Stringable
    {
        Heading::assertInstanceOf($node);

$tag = 'h' . $node->getLevel();

$attrs = $node->data->get('attributes');

return new HtmlElement($tag, $attrs, $childRenderer->renderNodes($node->children()));
    }

public function getXmlTagName(Node $node): string
    {
        return 'heading';
    }

/**
     * @param Heading $node
     *
     * @return array<string, scalar>
     *
     * @psalm-suppress MoreSpecificImplementedParamType
     */
    public function getXmlAttributes(Node $node): array
    {
        Heading::assertInstanceOf($node);

return ['level' => $node->getLevel()];
    }
}

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