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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.md"
 * file that was distributed with this source code.
 */

namespace Respect\Validation\Rules;

use Respect\Validation\Exceptions\BaseException;

class Base extends AbstractRule
{
    public $chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    public $base;

public function __construct($base = null, $chars = null)
    {
        if (!is_null($chars)) {
            $this->chars = $chars;
        }

$max = strlen($this->chars);
        if (!is_numeric($base) || $base > $max) {
            throw new BaseException(sprintf('a base between 1 and %s is required', $max));
        }
        $this->base = $base;
    }

public function validate($input)
    {
        $valid = substr($this->chars, 0, $this->base);

return (boolean) preg_match("@^[$valid]+$@", (string) $input);
    }
}