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    <h3>Editing: EnumRequirement.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Routing\Requirement;

use Symfony\Component\Routing\Exception\InvalidArgumentException;

final class EnumRequirement implements \Stringable
{
    private string $requirement;

    /**
     * @template T of \BackedEnum
     *
     * @param class-string&lt;T&gt;|list&lt;T&gt; $cases
     */
    public function __construct(string|array $cases = [])
    {
        if (\is_string($cases)) {
            if (!is_subclass_of($cases, \BackedEnum::class, true)) {
                throw new InvalidArgumentException(sprintf('&quot;%s&quot; is not a &quot;BackedEnum&quot; class.', $cases));
            }

            $cases = $cases::cases();
        } else {
            $class = null;

            foreach ($cases as $case) {
                if (!$case instanceof \BackedEnum) {
                    throw new InvalidArgumentException(sprintf('Case must be a &quot;BackedEnum&quot; instance, &quot;%s&quot; given.', get_debug_type($case)));
                }

                $class ??= $case::class;

                if (!$case instanceof $class) {
                    throw new InvalidArgumentException(sprintf('&quot;%s::%s&quot; is not a case of &quot;%s&quot;.', get_debug_type($case), $case-&gt;name, $class));
                }
            }
        }

        $this-&gt;requirement = implode('|', array_map(static fn ($e) =&gt; preg_quote($e-&gt;value), $cases));
    }

    public function __toString(): string
    {
        return $this-&gt;requirement;
    }
}
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