misuzu/src/Parsers/BBCode/Tags/CodeTag.php

<?php
namespace Misuzu\Parsers\BBCode\Tags;

use Misuzu\Parsers\BBCode\BBCodeTag;

final class CodeTag extends BBCodeTag {
    public function parseText(string $text): string {
        return preg_replace_callback(
            '/\[code(?:\=([a-z]+))?\](.+?)\[\/code\]/s',
            function ($matches) {
                $class = strlen($matches[1]) ? "lang-{$matches[1]}" : '';
                $text = strtr($matches[2], [
                    '[' => '&#91;',
                    ']' => '&#93;',
                    '<' => '&lt;',
                    '>' => '&gt;',
                    "\r\n" => '&#20;',
                    "\r" => '&#20;',
                    "\n" => '&#20;',
                ]);

                return "<pre class='bbcode__code'><code class='bbcode__code-container {$class}'>{$text}</code></pre>";
            },
            $text
        );
    }
}