client/src/variants/Recycle.js

   1 import { ChessRules, PiPo, Move } from "@/base_rules";
   2 import { ArrayFun } from "@/utils/array";
   3
   4 export class RecycleRules extends ChessRules {
   5
   6   static get PawnSpecs() {
   7     return Object.assign(
   8       {},
   9       ChessRules.PawnSpecs,
  10       { promotions: [V.PAWN] } //in fact, none
  11     );
  12   }
  13
  14   static IsGoodFen(fen) {
  15     if (!ChessRules.IsGoodFen(fen)) return false;
  16     const fenParsed = V.ParseFen(fen);
  17     // 5) Check reserves
  18     if (!fenParsed.reserve || !fenParsed.reserve.match(/^[0-9]{10,10}$/))
  19       return false;
  20     return true;
  21   }
  22
  23   static ParseFen(fen) {
  24     const fenParts = fen.split(" ");
  25     return Object.assign(
  26       ChessRules.ParseFen(fen),
  27       { reserve: fenParts[5] }
  28     );
  29   }
  30
  31   static GenRandInitFen(randomness) {
  32     return ChessRules.GenRandInitFen(randomness) + " 0000000000";
  33   }
  34
  35   getFen() {
  36     return super.getFen() + " " + this.getReserveFen();
  37   }
  38
  39   getFenForRepeat() {
  40     return super.getFenForRepeat() + "_" + this.getReserveFen();
  41   }
  42
  43   getReserveFen() {
  44     let counts = new Array(10);
  45     for (
  46       let i = 0;
  47       i < V.PIECES.length - 1;
  48       i++ //-1: no king reserve
  49     ) {
  50       counts[i] = this.reserve["w"][V.PIECES[i]];
  51       counts[5 + i] = this.reserve["b"][V.PIECES[i]];
  52     }
  53     return counts.join("");
  54   }
  55
  56   setOtherVariables(fen) {
  57     super.setOtherVariables(fen);
  58     // Also init reserves (used by the interface to show landable pieces)
  59     const reserve =
  60       V.ParseFen(fen).reserve.split("").map(x => parseInt(x, 10));
  61     this.reserve = {
  62       w: {
  63         [V.PAWN]: reserve[0],
  64         [V.ROOK]: reserve[1],
  65         [V.KNIGHT]: reserve[2],
  66         [V.BISHOP]: reserve[3],
  67         [V.QUEEN]: reserve[4]
  68       },
  69       b: {
  70         [V.PAWN]: reserve[5],
  71         [V.ROOK]: reserve[6],
  72         [V.KNIGHT]: reserve[7],
  73         [V.BISHOP]: reserve[8],
  74         [V.QUEEN]: reserve[9]
  75       }
  76     };
  77   }
  78
  79   getColor(i, j) {
  80     if (i >= V.size.x) return i == V.size.x ? "w" : "b";
  81     return this.board[i][j].charAt(0);
  82   }
  83
  84   getPiece(i, j) {
  85     if (i >= V.size.x) return V.RESERVE_PIECES[j];
  86     return this.board[i][j].charAt(1);
  87   }
  88
  89   // Used by the interface:
  90   getReservePpath(index, color) {
  91     return color + V.RESERVE_PIECES[index];
  92   }
  93
  94   // Ordering on reserve pieces
  95   static get RESERVE_PIECES() {
  96     return [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN];
  97   }
  98
  99   getReserveMoves([x, y]) {
 100     const color = this.turn;
 101     const p = V.RESERVE_PIECES[y];
 102     if (this.reserve[color][p] == 0) return [];
 103     let moves = [];
 104     const pawnShift = p == V.PAWN ? 1 : 0;
 105     for (let i = pawnShift; i < V.size.x - pawnShift; i++) {
 106       for (let j = 0; j < V.size.y; j++) {
 107         if (this.board[i][j] == V.EMPTY) {
 108           let mv = new Move({
 109             appear: [
 110               new PiPo({
 111                 x: i,
 112                 y: j,
 113                 c: color,
 114                 p: p
 115               })
 116             ],
 117             vanish: [],
 118             start: { x: x, y: y }, //a bit artificial...
 119             end: { x: i, y: j }
 120           });
 121           moves.push(mv);
 122         }
 123       }
 124     }
 125     return moves;
 126   }
 127
 128   getPotentialMovesFrom([x, y]) {
 129     if (x >= V.size.x)
 130       // Reserves, outside of board: x == sizeX(+1)
 131       return this.getReserveMoves([x, y]);
 132     // Standard moves
 133     return super.getPotentialMovesFrom([x, y]);
 134   }
 135
 136   getPotentialPawnMoves([x, y]) {
 137     let moves = super.getPotentialPawnMoves([x, y]);
 138     // Remove pawns on 8th rank ("fallen"):
 139     const color = this.turn;
 140     const lastRank = (color == "w" ? 0 : V.size.x - 1);
 141     moves.forEach(m => {
 142       if (m.appear[0].x == lastRank) m.appear.pop();
 143     });
 144     return moves;
 145   }
 146
 147   getAllValidMoves() {
 148     let moves = super.getAllPotentialMoves();
 149     const color = this.turn;
 150     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 151       moves = moves.concat(
 152         this.getReserveMoves([V.size.x + (color == "w" ? 0 : 1), i])
 153       );
 154     }
 155     return this.filterValid(moves);
 156   }
 157
 158   atLeastOneMove() {
 159     if (!super.atLeastOneMove()) {
 160       // Search one reserve move
 161       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 162         let moves = this.filterValid(
 163           this.getReserveMoves([V.size.x + (this.turn == "w" ? 0 : 1), i])
 164         );
 165         if (moves.length > 0) return true;
 166       }
 167       return false;
 168     }
 169     return true;
 170   }
 171
 172   canTake([x1, y1], [x2, y2]) {
 173     // Self-captures allowed, except for the king:
 174     return this.getPiece(x2, y2) != V.KING;
 175   }
 176
 177   prePlay(move) {
 178     super.prePlay(move);
 179     // Skip castle:
 180     if (move.vanish.length == 2 && move.appear.length == 2) return;
 181     const color = this.turn;
 182     if (move.vanish.length == 0) this.reserve[color][move.appear[0].p]--;
 183     else if (move.vanish.length == 2 && move.vanish[1].c == color)
 184       // Self-capture
 185       this.reserve[color][move.vanish[1].p]++;
 186   }
 187
 188   postUndo(move) {
 189     super.postUndo(move);
 190     if (move.vanish.length == 2 && move.appear.length == 2) return;
 191     const color = this.turn;
 192     if (move.vanish.length == 0) this.reserve[color][move.appear[0].p]++;
 193     else if (move.vanish.length == 2 && move.vanish[1].c == color)
 194       this.reserve[color][move.vanish[1].p]--;
 195   }
 196
 197   static get SEARCH_DEPTH() {
 198     return 2;
 199   }
 200
 201   evalPosition() {
 202     let evaluation = super.evalPosition();
 203     // Add reserves:
 204     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 205       const p = V.RESERVE_PIECES[i];
 206       evaluation += this.reserve["w"][p] * V.VALUES[p];
 207       evaluation -= this.reserve["b"][p] * V.VALUES[p];
 208     }
 209     return evaluation;
 210   }
 211
 212   getNotation(move) {
 213     const finalSquare = V.CoordsToSquare(move.end);
 214     if (move.vanish.length > 0) {
 215       if (move.appear.length > 0) {
 216         // Standard move
 217         return super.getNotation(move);
 218       } else {
 219         // Pawn fallen: capturing or not
 220         let res = "";
 221         if (move.vanish.length == 2)
 222           res += V.CoordToColumn(move.start.y) + "x";
 223         return res + finalSquare;
 224       }
 225     }
 226     // Rebirth:
 227     const piece =
 228       move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "";
 229     return piece + "@" + V.CoordsToSquare(move.end);
 230   }
 231
 232 };