Flip knights for variants with knightriders (waiting for a better image)
[vchess.git] / client / src / variants / Recycle.js
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1import { ChessRules, PiPo, Move } from "@/base_rules";
2import { ArrayFun } from "@/utils/array";
3
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4export class RecycleRules extends ChessRules {
5 static get PawnSpecs() {
6 return Object.assign(
7 {},
8 ChessRules.PawnSpecs,
9 { promotions: [V.PAWN] } //in fact, none
10 );
11 }
12
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13 static IsGoodFen(fen) {
14 if (!ChessRules.IsGoodFen(fen)) return false;
15 const fenParsed = V.ParseFen(fen);
16 // 5) Check reserves
17 if (!fenParsed.reserve || !fenParsed.reserve.match(/^[0-9]{10,10}$/))
18 return false;
19 return true;
20 }
21
22 static ParseFen(fen) {
23 const fenParts = fen.split(" ");
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24 return Object.assign(
25 ChessRules.ParseFen(fen),
26 { reserve: fenParts[5] }
27 );
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28 }
29
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30 static GenRandInitFen(randomness) {
31 return ChessRules.GenRandInitFen(randomness) + " 0000000000";
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32 }
33
34 getFen() {
90e814b6 35 return super.getFen() + " " + this.getReserveFen();
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36 }
37
f9c36b2d 38 getFenForRepeat() {
90e814b6 39 return super.getFenForRepeat() + "_" + this.getReserveFen();
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40 }
41
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42 getReserveFen() {
43 let counts = new Array(10);
44 for (
45 let i = 0;
46 i < V.PIECES.length - 1;
47 i++ //-1: no king reserve
48 ) {
49 counts[i] = this.reserve["w"][V.PIECES[i]];
50 counts[5 + i] = this.reserve["b"][V.PIECES[i]];
51 }
52 return counts.join("");
53 }
54
55 setOtherVariables(fen) {
56 super.setOtherVariables(fen);
78d64531 57 // Also init reserves (used by the interface to show landable pieces)
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58 const reserve =
59 V.ParseFen(fen).reserve.split("").map(x => parseInt(x, 10));
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60 this.reserve = {
61 w: {
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62 [V.PAWN]: reserve[0],
63 [V.ROOK]: reserve[1],
64 [V.KNIGHT]: reserve[2],
65 [V.BISHOP]: reserve[3],
66 [V.QUEEN]: reserve[4]
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67 },
68 b: {
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69 [V.PAWN]: reserve[5],
70 [V.ROOK]: reserve[6],
71 [V.KNIGHT]: reserve[7],
72 [V.BISHOP]: reserve[8],
73 [V.QUEEN]: reserve[9]
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74 }
75 };
76 }
77
78 getColor(i, j) {
79 if (i >= V.size.x) return i == V.size.x ? "w" : "b";
80 return this.board[i][j].charAt(0);
81 }
82
83 getPiece(i, j) {
84 if (i >= V.size.x) return V.RESERVE_PIECES[j];
85 return this.board[i][j].charAt(1);
86 }
87
88 // Used by the interface:
241bf8f2 89 getReservePpath(index, color) {
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90 return color + V.RESERVE_PIECES[index];
91 }
92
93 // Ordering on reserve pieces
94 static get RESERVE_PIECES() {
95 return [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN];
96 }
97
98 getReserveMoves([x, y]) {
99 const color = this.turn;
100 const p = V.RESERVE_PIECES[y];
101 if (this.reserve[color][p] == 0) return [];
102 let moves = [];
103 const pawnShift = p == V.PAWN ? 1 : 0;
104 for (let i = pawnShift; i < V.size.x - pawnShift; i++) {
105 for (let j = 0; j < V.size.y; j++) {
106 if (this.board[i][j] == V.EMPTY) {
107 let mv = new Move({
108 appear: [
109 new PiPo({
110 x: i,
111 y: j,
112 c: color,
113 p: p
114 })
115 ],
116 vanish: [],
117 start: { x: x, y: y }, //a bit artificial...
118 end: { x: i, y: j }
119 });
120 moves.push(mv);
121 }
122 }
123 }
124 return moves;
125 }
126
127 getPotentialMovesFrom([x, y]) {
e50a8025 128 if (x >= V.size.x)
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129 // Reserves, outside of board: x == sizeX(+1)
130 return this.getReserveMoves([x, y]);
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131 // Standard moves
132 return super.getPotentialMovesFrom([x, y]);
133 }
134
135 getPotentialPawnMoves([x, y]) {
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136 let moves = super.getPotentialPawnMoves([x, y]);
137 // Remove pawns on 8th rank ("fallen"):
78d64531 138 const color = this.turn;
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139 const lastRank = (color == "w" ? 0 : V.size.x - 1);
140 moves.forEach(m => {
141 if (m.appear[0].x == lastRank) m.appear.pop();
142 });
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143 return moves;
144 }
145
146 getAllValidMoves() {
0e001022 147 let moves = super.getAllPotentialMoves();
78d64531 148 const color = this.turn;
0e001022 149 for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
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150 moves = moves.concat(
151 this.getReserveMoves([V.size.x + (color == "w" ? 0 : 1), i])
152 );
0e001022 153 }
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154 return this.filterValid(moves);
155 }
156
157 atLeastOneMove() {
158 if (!super.atLeastOneMove()) {
159 // Search one reserve move
160 for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
161 let moves = this.filterValid(
162 this.getReserveMoves([V.size.x + (this.turn == "w" ? 0 : 1), i])
163 );
164 if (moves.length > 0) return true;
165 }
166 return false;
167 }
168 return true;
169 }
170
171 canTake([x1, y1], [x2, y2]) {
172 // Self-captures allowed, except for the king:
173 return this.getPiece(x2, y2) != V.KING;
174 }
175
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176 prePlay(move) {
177 super.prePlay(move);
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178 // Skip castle:
179 if (move.vanish.length == 2 && move.appear.length == 2) return;
32f6285e 180 const color = this.turn;
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181 if (move.vanish.length == 0) this.reserve[color][move.appear[0].p]--;
182 else if (move.vanish.length == 2 && move.vanish[1].c == color)
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183 // Self-capture
184 this.reserve[color][move.vanish[1].p]++;
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185 }
186
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187 postUndo(move) {
188 super.postUndo(move);
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189 if (move.vanish.length == 2 && move.appear.length == 2) return;
190 const color = this.turn;
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191 if (move.vanish.length == 0) this.reserve[color][move.appear[0].p]++;
192 else if (move.vanish.length == 2 && move.vanish[1].c == color)
78d64531 193 this.reserve[color][move.vanish[1].p]--;
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194 }
195
196 static get SEARCH_DEPTH() {
197 return 2;
198 }
199
200 evalPosition() {
201 let evaluation = super.evalPosition();
202 // Add reserves:
203 for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
204 const p = V.RESERVE_PIECES[i];
205 evaluation += this.reserve["w"][p] * V.VALUES[p];
206 evaluation -= this.reserve["b"][p] * V.VALUES[p];
207 }
208 return evaluation;
209 }
210
211 getNotation(move) {
212 const finalSquare = V.CoordsToSquare(move.end);
213 if (move.vanish.length > 0) {
214 if (move.appear.length > 0) {
215 // Standard move
216 return super.getNotation(move);
217 } else {
218 // Pawn fallen: capturing or not
219 let res = "";
220 if (move.vanish.length == 2)
221 res += V.CoordToColumn(move.start.y) + "x";
222 return res + finalSquare;
223 }
224 }
225 // Rebirth:
226 const piece =
227 move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "";
228 return piece + "@" + V.CoordsToSquare(move.end);
229 }
230};