blogben/src/Markdown/Extension/IntroExtension.php

<?php

namespace App\Markdown\Extension;

use App\Markdown\Block\IntroBlock;
use App\Markdown\Parser\IntroParser;
use App\Markdown\Render\IntroRenderer;
use League\CommonMark\Environment\EnvironmentBuilderInterface;
use League\CommonMark\Extension\ExtensionInterface;

class IntroExtension implements ExtensionInterface
{
    public function register(EnvironmentBuilderInterface $environment): void
    {
        $environment->addBlockStartParser(IntroParser::createBlockStartParser(), 0);
        $environment->addRenderer(IntroBlock::class, new IntroRenderer(), 0);
    }
}