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   getPPpath(m) {
  90     if (m.vanish.length == 2 && m.appear.length == 2) {
  91       // Castle: show castle symbol
  92       return "Coregal/castle";
  93     }
  94     return super.getPPpath(m);
  95   }
  96
  97   // Used by the interface:
  98   getReservePpath(index, color) {
  99     return color + V.RESERVE_PIECES[index];
 100   }
 101
 102   // Ordering on reserve pieces
 103   static get RESERVE_PIECES() {
 104     return [V.PAWN, V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN];
 105   }
 106
 107   getReserveMoves([x, y]) {
 108     const color = this.turn;
 109     const p = V.RESERVE_PIECES[y];
 110     if (this.reserve[color][p] == 0) return [];
 111     let moves = [];
 112     const pawnShift = p == V.PAWN ? 1 : 0;
 113     for (let i = pawnShift; i < V.size.x - pawnShift; i++) {
 114       for (let j = 0; j < V.size.y; j++) {
 115         if (this.board[i][j] == V.EMPTY) {
 116           let mv = new Move({
 117             appear: [
 118               new PiPo({
 119                 x: i,
 120                 y: j,
 121                 c: color,
 122                 p: p
 123               })
 124             ],
 125             vanish: [],
 126             start: { x: x, y: y }, //a bit artificial...
 127             end: { x: i, y: j }
 128           });
 129           moves.push(mv);
 130         }
 131       }
 132     }
 133     return moves;
 134   }
 135
 136   getPotentialMovesFrom([x, y]) {
 137     if (x >= V.size.x)
 138       // Reserves, outside of board: x == sizeX(+1)
 139       return this.getReserveMoves([x, y]);
 140     // Standard moves
 141     return super.getPotentialMovesFrom([x, y]);
 142   }
 143
 144   getPotentialPawnMoves([x, y]) {
 145     let moves = super.getPotentialPawnMoves([x, y]);
 146     // Remove pawns on 8th rank ("fallen"):
 147     const color = this.turn;
 148     const lastRank = (color == "w" ? 0 : V.size.x - 1);
 149     moves.forEach(m => {
 150       if (m.appear[0].x == lastRank) m.appear.pop();
 151     });
 152     return moves;
 153   }
 154
 155   getAllValidMoves() {
 156     let moves = super.getAllPotentialMoves();
 157     const color = this.turn;
 158     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 159       moves = moves.concat(
 160         this.getReserveMoves([V.size.x + (color == "w" ? 0 : 1), i])
 161       );
 162     }
 163     return this.filterValid(moves);
 164   }
 165
 166   atLeastOneMove() {
 167     if (!super.atLeastOneMove()) {
 168       // Search one reserve move
 169       for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 170         let moves = this.filterValid(
 171           this.getReserveMoves([V.size.x + (this.turn == "w" ? 0 : 1), i])
 172         );
 173         if (moves.length > 0) return true;
 174       }
 175       return false;
 176     }
 177     return true;
 178   }
 179
 180   canTake([x1, y1], [x2, y2]) {
 181     // Self-captures allowed, except for the king:
 182     return this.getPiece(x2, y2) != V.KING;
 183   }
 184
 185   prePlay(move) {
 186     super.prePlay(move);
 187     // Skip castle:
 188     if (move.vanish.length == 2 && move.appear.length == 2) return;
 189     const color = this.turn;
 190     if (move.vanish.length == 0) this.reserve[color][move.appear[0].p]--;
 191     else if (move.vanish.length == 2 && move.vanish[1].c == color)
 192       // Self-capture
 193       this.reserve[color][move.vanish[1].p]++;
 194   }
 195
 196   postUndo(move) {
 197     super.postUndo(move);
 198     if (move.vanish.length == 2 && move.appear.length == 2) return;
 199     const color = this.turn;
 200     if (move.vanish.length == 0) this.reserve[color][move.appear[0].p]++;
 201     else if (move.vanish.length == 2 && move.vanish[1].c == color)
 202       this.reserve[color][move.vanish[1].p]--;
 203   }
 204
 205   static get SEARCH_DEPTH() {
 206     return 2;
 207   }
 208
 209   evalPosition() {
 210     let evaluation = super.evalPosition();
 211     // Add reserves:
 212     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
 213       const p = V.RESERVE_PIECES[i];
 214       evaluation += this.reserve["w"][p] * V.VALUES[p];
 215       evaluation -= this.reserve["b"][p] * V.VALUES[p];
 216     }
 217     return evaluation;
 218   }
 219
 220   getNotation(move) {
 221     const finalSquare = V.CoordsToSquare(move.end);
 222     if (move.vanish.length > 0) {
 223       if (move.appear.length > 0) {
 224         // Standard move
 225         return super.getNotation(move);
 226       } else {
 227         // Pawn fallen: capturing or not
 228         let res = "";
 229         if (move.vanish.length == 2)
 230           res += V.CoordToColumn(move.start.y) + "x";
 231         return res + finalSquare;
 232       }
 233     }
 234     // Rebirth:
 235     const piece =
 236       move.appear[0].p != V.PAWN ? move.appear[0].p.toUpperCase() : "";
 237     return piece + "@" + V.CoordsToSquare(move.end);
 238   }
 239
 240 };