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<?php

/*
 * This file is part of Respect/Validation.
 *
 * (c) Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
 *
 * For the full copyright and license information, please view the LICENSE file
 * that was distributed with this source code.
 */

declare(strict_types=1);

namespace Respect\Validation\Rules;

use function is_string;
use function mb_strstr;
use function preg_match;

/**
 * Validates whether the input is a valid slug.
 *
 * @author Carlos André Ferrari <caferrari@gmail.com>
 * @author Danilo Correa <danilosilva87@gmail.com>
 * @author Henrique Moody <henriquemoody@gmail.com>
 * @author Nick Lombard <github@jigsoft.co.za>
 */
final class Slug extends AbstractRule
{
    /**
     * {@inheritDoc}
     */
    public function validate($input): bool
    {
        if (!is_string($input) || mb_strstr($input, '--')) {
            return false;
        }

if (!preg_match('@^[0-9a-z\-]+$@', $input)) {
            return false;
        }

return preg_match('@^-|-$@', $input) === 0;
    }
}