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<?php
/**
* webtrees: online genealogy
* Copyright (C) 2021 webtrees development team
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
declare(strict_types=1);
namespace Fisharebest\Webtrees\Elements;
use function mb_strlen;
use function mb_strtolower;
use function mb_strtoupper;
use function mb_substr;
/**
* @see https://en.wikipedia.org/wiki/Maidenhead_Locator_System
*/
class MaidenheadLocator extends AbstractElement
{
protected const MAXIMUM_LENGTH = 8;
protected const PATTERN = '[A-Ra-r][A-Ra-r]([0-9][0-9]([A-Xa-x][A-Xa-x]([0-9][0-9])?)?)?';
/**
* Convert a value to a canonical form.
*
* @param string $value
*
* @return string
*/
public function canonical(string $value): string
{
$value = parent::canonical($value);
// Characters 1 and 2 are upper case
if (mb_strlen($value) >= 2) {
$value = mb_strtoupper(mb_substr($value, 0, 2)) . mb_substr($value, 2);
}
// Characters 5 and 6 are lower case
if (mb_strlen($value) >= 6) {
$value = mb_substr($value, 0, 4) . mb_strtolower(mb_substr($value, 4, 2)) . mb_substr($value, 6);
}
return $value;
}
}
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