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   static get PawnSpecs() {
   6     return Object.assign(
   7       {},
   8       ChessRules.PawnSpecs,
   9       { promotions: [V.PAWN] } //in fact, none
  10     );
  11   }
  12
  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(" ");
  24     return Object.assign(
  25       ChessRules.ParseFen(fen),
  26       { reserve: fenParts[5] }
  27     );
  28   }
  29
  30   getEpSquare(moveOrSquare) {
  31     if (typeof moveOrSquare !== "object" || moveOrSquare.vanish.length > 0)
  32       return super.getEpSquare(moveOrSquare);
  33     // Landing move: no en-passant
  34     return undefined;
  35   }
  36
  37   static GenRandInitFen(randomness) {
  38     return ChessRules.GenRandInitFen(randomness) + " 0000000000";
  39   }
  40
  41   getFen() {
  42     return super.getFen() + " " + this.getReserveFen();
  43   }
  44
  45   getFenForRepeat() {
  46     return super.getFenForRepeat() + "_" + this.getReserveFen();
  47   }
  48
  49   getReserveFen() {
  50     let counts = new Array(10);
  51     for (
  52       let i = 0;
  53       i < V.PIECES.length - 1;
  54       i++ //-1: no king reserve
  55     ) {
  56       counts[i] = this.reserve["w"][V.PIECES[i]];
  57       counts[5 + i] = this.reserve["b"][V.PIECES[i]];
  58     }
  59     return counts.join("");
  60   }
  61
  62   setOtherVariables(fen) {
  63     super.setOtherVariables(fen);
  64     const fenParsed = V.ParseFen(fen);
  65     // Also init reserves (used by the interface to show landable pieces)
  66     this.reserve = {
  67       w: {
  68         [V.PAWN]: parseInt(fenParsed.reserve[0]),
  69         [V.ROOK]: parseInt(fenParsed.reserve[1]),
  70         [V.KNIGHT]: parseInt(fenParsed.reserve[2]),
  71         [V.BISHOP]: parseInt(fenParsed.reserve[3]),
  72         [V.QUEEN]: parseInt(fenParsed.reserve[4])
  73       },
  74       b: {
  75         [V.PAWN]: parseInt(fenParsed.reserve[5]),
  76         [V.ROOK]: parseInt(fenParsed.reserve[6]),
  77         [V.KNIGHT]: parseInt(fenParsed.reserve[7]),
  78         [V.BISHOP]: parseInt(fenParsed.reserve[8]),
  79         [V.QUEEN]: parseInt(fenParsed.reserve[9])
  80       }
  81     };
  82   }
  83
  84   getColor(i, j) {
  85     if (i >= V.size.x) return i == V.size.x ? "w" : "b";
  86     return this.board[i][j].charAt(0);
  87   }
  88
  89   getPiece(i, j) {
  90     if (i >= V.size.x) return V.RESERVE_PIECES[j];
  91     return this.board[i][j].charAt(1);
  92   }
  93
  94   // Used by the interface:
  95   getReservePpath(index, color) {
  96     return color + V.RESERVE_PIECES[index];
  97   }
  98
  99   // Ordering on reserve pieces
 100   static get RESERVE_PIECES() {
 101     return [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN];
 102   }
 103
 104   getReserveMoves([x, y]) {
 105     const color = this.turn;
 106     const p = V.RESERVE_PIECES[y];
 107     if (this.reserve[color][p] == 0) return [];
 108     let moves = [];
 109     const pawnShift = p == V.PAWN ? 1 : 0;
 110     for (let i = pawnShift; i < V.size.x - pawnShift; i++) {
 111       for (let j = 0; j < V.size.y; j++) {
 112         if (this.board[i][j] == V.EMPTY) {
 113           let mv = new Move({
 114             appear: [
 115               new PiPo({
 116                 x: i,
 117                 y: j,
 118                 c: color,
 119                 p: p
 120               })
 121             ],
 122             vanish: [],
 123             start: { x: x, y: y }, //a bit artificial...
 124             end: { x: i, y: j }
 125           });
 126           moves.push(mv);
 127         }
 128       }
 129     }
 130     return moves;
 131   }
 132
 133   getPotentialMovesFrom([x, y]) {
 134     if (x >= V.size.x) {
 135       // Reserves, outside of board: x == sizeX(+1)
 136       return this.getReserveMoves([x, y]);
 137     }
 138     // Standard moves
 139     return super.getPotentialMovesFrom([x, y]);
 140   }
 141
 142   getPotentialPawnMoves([x, y]) {
 143     let moves = super.getPotentialPawnMoves([x, y]);
 144     // Remove pawns on 8th rank ("fallen"):
 145     const color = this.turn;
 146     const lastRank = (color == "w" ? 0 : V.size.x - 1);
 147     moves.forEach(m => {
 148       if (m.appear[0].x == lastRank) m.appear.pop();
 149     });
 150     return moves;
 151   }
 152
 153   getAllValidMoves() {
 154     let moves = super.getAllValidMoves();
 155     const color = this.turn;
 156     for (let i = 0; i < V.RESERVE_PIECES.length; i++)
 157       moves = moves.concat(
 158         this.getReserveMoves([V.size.x + (color == "w" ? 0 : 1), i])
 159       );
 160     return this.filterValid(moves);
 161   }
 162
 163   atLeastOneMove() {
 164     if (!super.atLeastOneMove()) {
 165       // Search one reserve move
 166       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 167         let moves = this.filterValid(
 168           this.getReserveMoves([V.size.x + (this.turn == "w" ? 0 : 1), i])
 169         );
 170         if (moves.length > 0) return true;
 171       }
 172       return false;
 173     }
 174     return true;
 175   }
 176
 177   canTake([x1, y1], [x2, y2]) {
 178     // Self-captures allowed, except for the king:
 179     return this.getPiece(x2, y2) != V.KING;
 180   }
 181
 182   prePlay(move) {
 183     super.prePlay(move);
 184     if (move.vanish.length == 2 && move.appear.length == 2) return; //skip castle
 185     const color = this.turn;
 186     if (move.vanish.length == 0) this.reserve[color][move.appear[0].p]--;
 187     else if (move.vanish.length == 2 && move.vanish[1].c == color)
 188       // Self-capture
 189       this.reserve[color][move.vanish[1].p]++;
 190   }
 191
 192   postUndo(move) {
 193     super.postUndo(move);
 194     if (move.vanish.length == 2 && move.appear.length == 2) return;
 195     const color = this.turn;
 196     if (move.vanish.length == 0) this.reserve[color][move.appear[0].p]++;
 197     else if (move.vanish.length == 2 && move.vanish[1].c == color)
 198       this.reserve[color][move.vanish[1].p]--;
 199   }
 200
 201   static get SEARCH_DEPTH() {
 202     return 2;
 203   }
 204
 205   evalPosition() {
 206     let evaluation = super.evalPosition();
 207     // Add reserves:
 208     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 209       const p = V.RESERVE_PIECES[i];
 210       evaluation += this.reserve["w"][p] * V.VALUES[p];
 211       evaluation -= this.reserve["b"][p] * V.VALUES[p];
 212     }
 213     return evaluation;
 214   }
 215
 216   getNotation(move) {
 217     const finalSquare = V.CoordsToSquare(move.end);
 218     if (move.vanish.length > 0) {
 219       if (move.appear.length > 0) {
 220         // Standard move
 221         return super.getNotation(move);
 222       } else {
 223         // Pawn fallen: capturing or not
 224         let res = "";
 225         if (move.vanish.length == 2)
 226           res += V.CoordToColumn(move.start.y) + "x";
 227         return res + finalSquare;
 228       }
 229     }
 230     // Rebirth:
 231     const piece =
 232       move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "";
 233     return piece + "@" + V.CoordsToSquare(move.end);
 234   }
 235 };