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0d5335de BA |
1 | import { ChessRules, PiPo, Move } from "@/base_rules"; |
2 | ||
3 | export class ParachuteRules extends ChessRules { | |
4 | static get HasFlags() { | |
5 | return false; | |
6 | } | |
7 | ||
8 | static IsGoodFen(fen) { | |
9 | if (!ChessRules.IsGoodFen(fen)) return false; | |
10 | const fenParsed = V.ParseFen(fen); | |
11 | // 5) Check reserves | |
12 | if (!fenParsed.reserve || !fenParsed.reserve.match(/^[0-9]{12,12}$/)) | |
13 | return false; | |
14 | return true; | |
15 | } | |
16 | ||
94b9fcef BA |
17 | static IsGoodPosition(position) { |
18 | if (position.length == 0) return false; | |
19 | const rows = position.split("/"); | |
20 | if (rows.length != V.size.x) return false; | |
21 | for (let row of rows) { | |
22 | let sumElts = 0; | |
23 | for (let i = 0; i < row.length; i++) { | |
24 | if (V.PIECES.includes(row[i].toLowerCase())) sumElts++; | |
25 | else { | |
e50a8025 | 26 | const num = parseInt(row[i], 10); |
94b9fcef BA |
27 | if (isNaN(num)) return false; |
28 | sumElts += num; | |
29 | } | |
30 | } | |
31 | if (sumElts != V.size.y) return false; | |
32 | } | |
33 | return true; | |
34 | } | |
35 | ||
0d5335de BA |
36 | static ParseFen(fen) { |
37 | const fenParts = fen.split(" "); | |
38 | return Object.assign( | |
39 | ChessRules.ParseFen(fen), | |
40 | { reserve: fenParts[4] } | |
41 | ); | |
42 | } | |
43 | ||
44 | static GenRandInitFen() { | |
45 | // ChessRules.PIECES order is P, R, N, B, Q, K: | |
46 | return "8/8/8/8/8/8/8/8 w 0 - 822211822211"; | |
47 | } | |
48 | ||
49 | getFen() { | |
50 | return super.getFen() + " " + this.getReserveFen(); | |
51 | } | |
52 | ||
53 | getFenForRepeat() { | |
54 | return super.getFenForRepeat() + "_" + this.getReserveFen(); | |
55 | } | |
56 | ||
57 | getReserveFen() { | |
58 | let counts = new Array(12); | |
59 | for (let i = 0; i < V.PIECES.length; i++) { | |
60 | counts[i] = this.reserve["w"][V.PIECES[i]]; | |
61 | counts[6 + i] = this.reserve["b"][V.PIECES[i]]; | |
62 | } | |
63 | return counts.join(""); | |
64 | } | |
65 | ||
66 | setOtherVariables(fen) { | |
67 | super.setOtherVariables(fen); | |
0d5335de | 68 | // Also init reserves (used by the interface to show landable pieces) |
e50a8025 BA |
69 | const reserve = |
70 | V.ParseFen(fen).reserve.split("").map(x => parseInt(x, 10)); | |
0d5335de BA |
71 | this.reserve = { |
72 | w: { | |
e50a8025 BA |
73 | [V.PAWN]: reserve[0], |
74 | [V.ROOK]: reserve[1], | |
75 | [V.KNIGHT]: reserve[2], | |
76 | [V.BISHOP]: reserve[3], | |
77 | [V.QUEEN]: reserve[4], | |
78 | [V.KING]: reserve[5] | |
0d5335de BA |
79 | }, |
80 | b: { | |
e50a8025 BA |
81 | [V.PAWN]: reserve[6], |
82 | [V.ROOK]: reserve[7], | |
83 | [V.KNIGHT]: reserve[8], | |
84 | [V.BISHOP]: reserve[9], | |
85 | [V.QUEEN]: reserve[10], | |
86 | [V.KING]: reserve[11] | |
0d5335de BA |
87 | } |
88 | }; | |
89 | } | |
90 | ||
91 | getColor(i, j) { | |
92 | if (i >= V.size.x) return i == V.size.x ? "w" : "b"; | |
93 | return this.board[i][j].charAt(0); | |
94 | } | |
95 | ||
96 | getPiece(i, j) { | |
97 | if (i >= V.size.x) return V.RESERVE_PIECES[j]; | |
98 | return this.board[i][j].charAt(1); | |
99 | } | |
100 | ||
101 | // Used by the interface: | |
102 | getReservePpath(index, color) { | |
103 | return color + V.RESERVE_PIECES[index]; | |
104 | } | |
105 | ||
106 | // Ordering on reserve pieces (matching V.PIECES order) | |
107 | static get RESERVE_PIECES() { | |
108 | return [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN, V.KING]; | |
109 | } | |
110 | ||
111 | getReserveMoves([x, y]) { | |
112 | const color = this.turn; | |
113 | const oppCol = V.GetOppCol(color); | |
114 | const p = V.RESERVE_PIECES[y]; | |
115 | if (this.reserve[color][p] == 0) return []; | |
116 | let moves = []; | |
117 | let boundary = | |
118 | p == V.PAWN | |
119 | // Pawns can land only on 4 first ranks: | |
120 | ? (color == 'w' ? [4, 8] : [0, 4]) | |
121 | : [0, 8]; | |
122 | for (let i = boundary[0]; i < boundary[1]; i++) { | |
123 | for (let j = 0; j < 8; j++) { | |
124 | if (this.board[i][j] == V.EMPTY) { | |
125 | let mv = new Move({ | |
126 | appear: [ | |
127 | new PiPo({ | |
128 | x: i, | |
129 | y: j, | |
130 | c: color, | |
131 | p: p | |
132 | }) | |
133 | ], | |
134 | vanish: [], | |
135 | start: { x: x, y: y }, //a bit artificial... | |
136 | end: { x: i, y: j } | |
137 | }); | |
138 | this.play(mv); | |
139 | // Landing with check is forbidden: | |
140 | if (!this.underCheck(oppCol)) moves.push(mv); | |
141 | this.undo(mv); | |
142 | } | |
143 | } | |
144 | } | |
145 | return moves; | |
146 | } | |
147 | ||
148 | getPotentialMovesFrom([x, y]) { | |
149 | let moves = | |
150 | x >= 8 | |
151 | ? this.getReserveMoves([x, y]) | |
152 | : super.getPotentialMovesFrom([x, y]); | |
153 | // Forbid captures if king not landed yet: | |
154 | if (x < 8 && moves.length > 0 && this.kingPos[moves[0].appear[0].c][0] < 0) | |
155 | moves = moves.filter(m => m.vanish.length == 1); | |
156 | return moves; | |
157 | } | |
158 | ||
159 | getAllValidMoves() { | |
160 | let moves = super.getAllValidMoves(); | |
161 | const color = this.turn; | |
162 | for (let i = 0; i < V.RESERVE_PIECES.length; i++) | |
163 | moves = moves.concat( | |
164 | this.getReserveMoves([V.size.x + (color == "w" ? 0 : 1), i]) | |
165 | ); | |
166 | return this.filterValid(moves); | |
167 | } | |
168 | ||
169 | isAttacked(sq, color) { | |
170 | // While the king hasn't landed, nothing is attacked: | |
171 | if (this.kingPos[color][0] < 0) return false; | |
172 | return super.isAttacked(sq, color); | |
173 | } | |
174 | ||
175 | atLeastOneMove() { | |
176 | if (!super.atLeastOneMove()) { | |
177 | // Search one reserve move | |
178 | for (let i = 0; i < V.RESERVE_PIECES.length; i++) { | |
179 | let moves = this.filterValid( | |
180 | this.getReserveMoves([V.size.x + (this.turn == "w" ? 0 : 1), i]) | |
181 | ); | |
182 | if (moves.length > 0) return true; | |
183 | } | |
184 | return false; | |
185 | } | |
186 | return true; | |
187 | } | |
188 | ||
94b9fcef BA |
189 | underCheck(color) { |
190 | if (this.kingPos[color][0] < 0) | |
191 | // A king outside the board isn't under check | |
192 | return false; | |
193 | return this.isAttacked(this.kingPos[color], V.GetOppCol(color)); | |
194 | } | |
195 | ||
0d5335de BA |
196 | prePlay(move) { |
197 | super.prePlay(move); | |
198 | if (move.vanish.length == 0) this.reserve[this.turn][move.appear[0].p]--; | |
199 | } | |
200 | ||
201 | postUndo(move) { | |
202 | if (move.vanish.length == 0) this.reserve[this.turn][move.appear[0].p]++; | |
203 | // (Potentially) Reset king position | |
204 | if (move.appear[0].p == V.KING) { | |
205 | const c = move.appear[0].c; | |
206 | if (move.vanish.length == 0) | |
207 | // Landing king | |
208 | this.kingPos[c] = [-1, -1]; | |
209 | else | |
210 | // King movement | |
211 | this.kingPos[c] = [move.start.x, move.start.y]; | |
212 | } | |
213 | } | |
214 | ||
215 | static get SEARCH_DEPTH() { | |
216 | return 1; | |
217 | } | |
218 | ||
219 | evalPosition() { | |
220 | let evaluation = super.evalPosition(); | |
221 | // Add reserves: | |
222 | for (let i = 0; i < V.RESERVE_PIECES.length; i++) { | |
223 | const p = V.RESERVE_PIECES[i]; | |
224 | evaluation += this.reserve["w"][p] * V.VALUES[p]; | |
225 | evaluation -= this.reserve["b"][p] * V.VALUES[p]; | |
226 | } | |
227 | return evaluation; | |
228 | } | |
229 | ||
230 | getNotation(move) { | |
231 | if (move.vanish.length > 0) return super.getNotation(move); | |
232 | // Parachutage: | |
233 | const piece = | |
234 | move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : ""; | |
235 | return piece + "@" + V.CoordsToSquare(move.end); | |
236 | } | |
237 | }; |