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6
1<?php
2/**
3 * Jingga
4 *
5 * PHP Version 8.1
6 *
7 * @package   phpOMS\Algorithm\Sort;
8 * @copyright Dennis Eichhorn
9 * @license   OMS License 2.0
10 * @version   1.0.0
11 * @link      https://jingga.app
12 */
13declare(strict_types=1);
14
15namespace phpOMS\Algorithm\Sort;
16
17/**
18 * ShellSort class.
19 *
20 * @package phpOMS\Algorithm\Sort;
21 * @license OMS License 2.0
22 * @link    https://jingga.app
23 * @since   1.0.0
24 */
25final class ShellSort implements SortInterface
26{
27    /**
28     * Constructor
29     *
30     * @since 1.0.0
31     * @codeCoverageIgnore
32     */
33    private function __construct()
34    {
35    }
36
37    /**
38     * {@inheritdoc}
39     */
40    public static function sort(array $list, int $order = SortOrder::ASC) : array
41    {
42        $n = \count($list);
43
44        if ($n < 2) {
45            return $list;
46        }
47
48        for ($i = (int) ($n / 2); $i > 0; $i = (int) ($i / 2)) {
49            for ($j = $i; $j < $n; ++$j) {
50                $temp = $list[$j];
51
52                for ($c = $j; $c >= $i && $list[$c - $i]->compare($temp, $order); $c -= $i) {
53                    $list[$c] = $list[$c - $i];
54                }
55
56                $list[$c] = $temp;
57            }
58        }
59
60        return $list;
61    }
62}