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1c58eb76 | 1 | import { ChessRules, Move, PiPo } from "@/base_rules"; |
dfc78263 BA |
2 | |
3 | export class CannibalRules extends ChessRules { | |
1c58eb76 BA |
4 | static get KING_CODE() { |
5 | return { | |
6 | 'p': 's', | |
7 | 'r': 'u', | |
8 | 'n': 'o', | |
9 | 'b': 'c', | |
10 | 'q': 't' | |
11 | }; | |
12 | } | |
13 | ||
14 | static get KING_DECODE() { | |
15 | return { | |
16 | 's': 'p', | |
17 | 'u': 'r', | |
18 | 'o': 'n', | |
19 | 'c': 'b', | |
20 | 't': 'q' | |
21 | }; | |
22 | } | |
23 | ||
24 | // Kings may be disguised: | |
25 | getPiece(x, y) { | |
26 | const piece = this.board[x][y].charAt(1); | |
27 | if (Object.keys(V.KING_DECODE).includes(piece)) | |
28 | return V.KING_DECODE[piece]; | |
29 | return piece; | |
30 | } | |
31 | ||
32 | getPpath(b) { | |
33 | return (Object.keys(V.KING_DECODE).includes(b[1]) ? "Cannibal/" : "") + b; | |
34 | } | |
35 | ||
36 | // Kings may be disguised: | |
37 | setOtherVariables(fen) { | |
38 | super.setOtherVariables(fen); | |
39 | const rows = V.ParseFen(fen).position.split("/"); | |
40 | if (this.kingPos["w"][0] < 0 || this.kingPos["b"][0] < 0) { | |
41 | for (let i = 0; i < rows.length; i++) { | |
42 | let k = 0; //column index on board | |
43 | for (let j = 0; j < rows[i].length; j++) { | |
44 | const piece = rows[i].charAt(j); | |
45 | if (Object.keys(V.KING_DECODE).includes(piece.toLowerCase())) { | |
46 | const color = (piece.charCodeAt(0) <= 90 ? 'w' : 'b'); | |
47 | this.kingPos[color] = [i, k]; | |
48 | } else { | |
49 | const num = parseInt(rows[i].charAt(j)); | |
50 | if (!isNaN(num)) k += num - 1; | |
51 | } | |
52 | k++; | |
53 | } | |
54 | } | |
55 | } | |
56 | } | |
57 | ||
dfc78263 BA |
58 | // Trim all non-capturing moves |
59 | static KeepCaptures(moves) { | |
60 | return moves.filter(m => m.vanish.length == 2 && m.appear.length == 1); | |
61 | } | |
62 | ||
63 | // Stop at the first capture found (if any) | |
64 | atLeastOneCapture() { | |
65 | const color = this.turn; | |
66 | const oppCol = V.GetOppCol(color); | |
67 | for (let i = 0; i < V.size.x; i++) { | |
68 | for (let j = 0; j < V.size.y; j++) { | |
69 | if ( | |
70 | this.board[i][j] != V.EMPTY && | |
71 | this.getColor(i, j) != oppCol && | |
72 | this.filterValid(this.getPotentialMovesFrom([i, j])).some(m => | |
73 | // Warning: discard castle moves | |
74 | m.vanish.length == 2 && m.appear.length == 1) | |
75 | ) { | |
76 | return true; | |
77 | } | |
78 | } | |
79 | } | |
80 | return false; | |
81 | } | |
82 | ||
1c58eb76 BA |
83 | // Because of the disguised kings, getPiece() could be wrong: |
84 | // use board[x][y][1] instead (always valid). | |
85 | getBasicMove([sx, sy], [ex, ey], tr) { | |
86 | const initColor = this.getColor(sx, sy); | |
87 | const initPiece = this.board[sx][sy].charAt(1); | |
88 | let mv = new Move({ | |
89 | appear: [ | |
90 | new PiPo({ | |
91 | x: ex, | |
92 | y: ey, | |
93 | c: tr ? tr.c : initColor, | |
94 | p: tr ? tr.p : initPiece | |
95 | }) | |
96 | ], | |
97 | vanish: [ | |
98 | new PiPo({ | |
99 | x: sx, | |
100 | y: sy, | |
101 | c: initColor, | |
102 | p: initPiece | |
103 | }) | |
104 | ] | |
dfc78263 | 105 | }); |
1c58eb76 BA |
106 | |
107 | // The opponent piece disappears if we take it | |
108 | if (this.board[ex][ey] != V.EMPTY) { | |
109 | mv.vanish.push( | |
110 | new PiPo({ | |
111 | x: ex, | |
112 | y: ey, | |
113 | c: this.getColor(ex, ey), | |
114 | p: this.board[ex][ey].charAt(1) | |
115 | }) | |
116 | ); | |
117 | ||
118 | // If the captured piece has a different nature: take it as well | |
119 | if (mv.vanish[0].p != mv.vanish[1].p) { | |
120 | if ( | |
121 | mv.vanish[0].p == V.KING || | |
122 | Object.keys(V.KING_DECODE).includes(mv.vanish[0].p) | |
123 | ) { | |
124 | mv.appear[0].p = V.KING_CODE[mv.vanish[1].p]; | |
125 | } else mv.appear[0].p = mv.vanish[1].p; | |
126 | } | |
127 | } | |
128 | else if (!!tr && mv.vanish[0].p != V.PAWN) | |
129 | // Special case of a non-capturing king-as-pawn promotion | |
130 | mv.appear[0].p = V.KING_CODE[tr.p]; | |
131 | ||
132 | return mv; | |
133 | } | |
134 | ||
135 | getPotentialMovesFrom([x, y]) { | |
136 | const piece = this.board[x][y].charAt(1); | |
137 | if (Object.keys(V.KING_DECODE).includes(piece)) | |
138 | return super.getPotentialMovesFrom([x, y], V.KING_DECODE[piece]); | |
139 | return super.getPotentialMovesFrom([x, y], piece); | |
140 | } | |
141 | ||
142 | addPawnMoves([x1, y1], [x2, y2], moves) { | |
143 | let finalPieces = [V.PAWN]; | |
144 | const color = this.turn; | |
145 | const lastRank = (color == "w" ? 0 : V.size.x - 1); | |
146 | if (x2 == lastRank) { | |
147 | if (this.board[x2][y2] != V.EMPTY) | |
148 | // Cannibal rules: no choice if capture | |
149 | finalPieces = [this.getPiece(x2, y2)]; | |
150 | else finalPieces = V.PawnSpecs.promotions; | |
151 | } | |
152 | let tr = null; | |
153 | for (let piece of finalPieces) { | |
154 | tr = (piece != V.PAWN ? { c: color, p: piece } : null); | |
155 | moves.push(this.getBasicMove([x1, y1], [x2, y2], tr)); | |
156 | } | |
dfc78263 BA |
157 | } |
158 | ||
159 | getPossibleMovesFrom(sq) { | |
160 | let moves = this.filterValid(this.getPotentialMovesFrom(sq)); | |
161 | const captureMoves = V.KeepCaptures(moves); | |
162 | if (captureMoves.length > 0) return captureMoves; | |
163 | if (this.atLeastOneCapture()) return []; | |
164 | return moves; | |
165 | } | |
166 | ||
167 | getAllValidMoves() { | |
168 | const moves = super.getAllValidMoves(); | |
a34caace BA |
169 | if (moves.some(m => m.vanish.length == 2 && m.appear.length == 1)) |
170 | return V.KeepCaptures(moves); | |
dfc78263 BA |
171 | return moves; |
172 | } | |
173 | ||
1c58eb76 BA |
174 | postPlay(move) { |
175 | const c = V.GetOppCol(this.turn); | |
176 | const piece = move.appear[0].p; | |
177 | // Update king position + flags | |
178 | if (piece == V.KING || Object.keys(V.KING_DECODE).includes(piece)) { | |
179 | this.kingPos[c][0] = move.appear[0].x; | |
180 | this.kingPos[c][1] = move.appear[0].y; | |
181 | this.castleFlags[c] = [V.size.y, V.size.y]; | |
182 | return; | |
183 | } | |
bb688df5 | 184 | super.updateCastleFlags(move, piece); |
1c58eb76 BA |
185 | } |
186 | ||
187 | postUndo(move) { | |
188 | // (Potentially) Reset king position | |
189 | const c = this.getColor(move.start.x, move.start.y); | |
190 | const piece = move.appear[0].p; | |
191 | if (piece == V.KING || Object.keys(V.KING_DECODE).includes(piece)) | |
192 | this.kingPos[c] = [move.start.x, move.start.y]; | |
193 | } | |
194 | ||
195 | static get VALUES() { | |
196 | return { | |
197 | p: 1, | |
198 | r: 5, | |
199 | n: 3, | |
200 | b: 3, | |
201 | q: 9, | |
202 | k: 5 | |
203 | }; | |
204 | } | |
205 | ||
dfc78263 BA |
206 | static get SEARCH_DEPTH() { |
207 | return 4; | |
208 | } | |
209 | }; |