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7
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 * OddEvenSort 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 OddEvenSort 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        $sorted = false;
43        $n      = \count($list);
44
45        if ($n < 2) {
46            return $list;
47        }
48
49        while (!$sorted) {
50            $sorted = true;
51
52            for ($i = 1; $i < $n - 1; $i += 2) {
53                if ($list[$i]->compare($list[$i + 1], $order)) {
54                    $old          = $list[$i];
55                    $list[$i]     = $list[$i + 1];
56                    $list[$i + 1] = $old;
57
58                    $sorted = false;
59                }
60            }
61
62            for ($i = 0; $i < $n - 1; $i += 2) {
63                if ($list[$i]->compare($list[$i + 1], $order)) {
64                    $old          = $list[$i];
65                    $list[$i]     = $list[$i + 1];
66                    $list[$i + 1] = $old;
67
68                    $sorted = false;
69                }
70            }
71        }
72
73        return $list;
74    }
75}