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1 | <?php |
2 | /** |
3 | * This file is a part of ChessBrowser. |
4 | * |
5 | * ChessBrowser is free software: you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation, either version 3 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program. If not, see <https://www.gnu.org/licenses/>. |
17 | * |
18 | * @file CastlingTracker |
19 | * @ingroup ChessBrowser |
20 | * @author DannyS712 |
21 | */ |
22 | |
23 | namespace MediaWiki\Extension\ChessBrowser; |
24 | |
25 | class CastlingTracker { |
26 | |
27 | /** @var string */ |
28 | private $castle; |
29 | |
30 | /** @var int */ |
31 | private $castleCode; |
32 | |
33 | private const CODES = [ |
34 | 'K' => 8, |
35 | 'Q' => 4, |
36 | 'k' => 2, |
37 | 'q' => 1 |
38 | ]; |
39 | |
40 | /** |
41 | * @param string $fromFen |
42 | */ |
43 | public function __construct( string $fromFen ) { |
44 | $this->castle = $fromFen ?: '-'; |
45 | $this->updateCode(); |
46 | } |
47 | |
48 | /** |
49 | * Is a castle currently valid (solely based on moved pieces, not the current board) |
50 | * |
51 | * @param string $option |
52 | * @return bool whether this castle is valid |
53 | */ |
54 | public function checkCastle( string $option ): bool { |
55 | $optionCode = self::CODES[$option] ?? 0; |
56 | return (bool)( $this->castleCode & $optionCode ); |
57 | } |
58 | |
59 | /** |
60 | * Set the castleCode |
61 | */ |
62 | private function updateCode() { |
63 | $totalCode = 0; |
64 | foreach ( str_split( $this->castle ) as $option ) { |
65 | $totalCode += self::CODES[$option] ?? 0; |
66 | } |
67 | $this->castleCode = $totalCode; |
68 | } |
69 | |
70 | /** |
71 | * Update the status after a move, and return the new castle status |
72 | * |
73 | * @param int $movedPiece |
74 | * @param int $from |
75 | * @return string |
76 | */ |
77 | public function updateForMove( int $movedPiece, int $from ): string { |
78 | $currentCastle = $this->castle; |
79 | $newCastle = $currentCastle; |
80 | switch ( $movedPiece ) { |
81 | case ChessPiece::WHITE_KING: |
82 | $newCastle = str_replace( [ 'K', 'Q' ], "", $currentCastle ); |
83 | break; |
84 | case ChessPiece::BLACK_KING: |
85 | $newCastle = str_replace( [ 'k', 'q' ], "", $currentCastle ); |
86 | break; |
87 | case ChessPiece::WHITE_ROOK: |
88 | if ( $from === 0 ) { |
89 | $newCastle = str_replace( 'Q', "", $currentCastle ); |
90 | } elseif ( $from === 7 ) { |
91 | $newCastle = str_replace( 'K', "", $currentCastle ); |
92 | } |
93 | break; |
94 | case ChessPiece::BLACK_ROOK: |
95 | if ( $from === 112 ) { |
96 | $newCastle = str_replace( 'q', "", $currentCastle ); |
97 | } elseif ( $from === 119 ) { |
98 | $newCastle = str_replace( 'k', "", $currentCastle ); |
99 | } |
100 | break; |
101 | } |
102 | $newCastle = $newCastle ?: '-'; |
103 | if ( $newCastle !== $currentCastle ) { |
104 | $this->castle = $newCastle; |
105 | $this->updateCode(); |
106 | } |
107 | return $newCastle; |
108 | } |
109 | |
110 | } |