gnu-social/src/Util/Bitmap.php

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<?php
// {{{ License
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
// }}}
namespace App\Util;
use App\Core\Log;
use App\Util\Exception\ServerException;
abstract class Bitmap
{
/**
* Convert from an integer to an onject or an array of constants for
* set each bit. If $instance, return an object with the corresponding
* properties set
*/
private static function _to(int $r, bool $instance)
{
$init = $r;
$class = get_called_class();
if ($instance) {
$obj = new $class;
} else {
$vals = [];
}
$consts = (new \ReflectionClass($class))->getConstants();
$have_prefix = false;
if (isset($consts['PREFIX'])) {
$have_prefix = true;
unset($consts['PREFIX']);
}
foreach ($consts as $c => $v) {
$b = ($r & $v) !== 0;
if ($instance) {
$c = strtolower($c);
$obj->{$c} = $b;
}
if ($b) {
$r -= $v;
if (!$instance) {
$vals[] = ($have_prefix ? $class::PREFIX : '') . $c;
}
}
}
if ($r != 0) {
Log::error('Bitmap to array conversion failed');
throw new ServerException("Bug in bitmap conversion for class {$class} from value {$init}");
}
if ($instance) {
return $obj;
} else {
return $vals;
}
}
public static function create(int $r): self
{
return self::_to($r, true);
}
public static function toArray(int $r): array
{
return self::_to($r, false);
}
}