client/src/variants/Minishogi.js

   1 import { ChessRules, PiPo, Move } from "@/base_rules";
   2 import { ShogiRules } from "@/variants/Shogi";
   3
   4 export class MinishogiRules extends ShogiRules {
   5
   6   static IsGoodFen(fen) {
   7     if (!ChessRules.IsGoodFen(fen)) return false;
   8     const fenParsed = V.ParseFen(fen);
   9     // 3) Check reserves
  10     if (!fenParsed.reserve || !fenParsed.reserve.match(/^[0-9]{10,10}$/))
  11       return false;
  12     return true;
  13   }
  14
  15   // No knight or lance
  16   static get PIECES() {
  17     return [
  18       ChessRules.PAWN,
  19       ChessRules.ROOK,
  20       ChessRules.BISHOP,
  21       ChessRules.KING,
  22       V.GOLD_G,
  23       V.SILVER_G,
  24       V.P_PAWN,
  25       V.P_SILVER,
  26       V.P_ROOK,
  27       V.P_BISHOP
  28     ];
  29   }
  30
  31   static GenRandInitFen() {
  32     return "rbsgk/4p/5/P4/KGSBR w 0 0000000000";
  33   }
  34
  35   getReserveFen() {
  36     let counts = new Array(10);
  37     for (let i = 0; i < V.RESERVE_PIECES.length; i++) {
  38       counts[i] = this.reserve["w"][V.RESERVE_PIECES[i]];
  39       counts[5 + i] = this.reserve["b"][V.RESERVE_PIECES[i]];
  40     }
  41     return counts.join("");
  42   }
  43
  44   setOtherVariables(fen) {
  45     super.setOtherVariables(fen);
  46     // Also init reserves (used by the interface to show landable pieces)
  47     const reserve =
  48       V.ParseFen(fen).reserve.split("").map(x => parseInt(x, 10));
  49     this.reserve = {
  50       w: {
  51         [V.PAWN]: reserve[0],
  52         [V.ROOK]: reserve[1],
  53         [V.BISHOP]: reserve[2],
  54         [V.GOLD_G]: reserve[3],
  55         [V.SILVER_G]: reserve[4]
  56       },
  57       b: {
  58         [V.PAWN]: reserve[5],
  59         [V.ROOK]: reserve[6],
  60         [V.BISHOP]: reserve[7],
  61         [V.GOLD_G]: reserve[8],
  62         [V.SILVER_G]: reserve[9]
  63       }
  64     };
  65   }
  66
  67   static get size() {
  68     return { x: 5, y: 5 };
  69   }
  70
  71   static get RESERVE_PIECES() {
  72     return (
  73       [V.PAWN, V.ROOK, V.BISHOP, V.GOLD_G, V.SILVER_G]
  74     );
  75   }
  76
  77   getReserveMoves([x, y]) {
  78     const color = this.turn;
  79     const p = V.RESERVE_PIECES[y];
  80     if (p == V.PAWN) {
  81       var oppCol = V.GetOppCol(color);
  82       var allowedFiles =
  83         [...Array(5).keys()].filter(j =>
  84           [...Array(5).keys()].every(i => {
  85             return (
  86               this.board[i][j] == V.EMPTY ||
  87               this.getColor(i, j) != color ||
  88               this.getPiece(i, j) != V.PAWN
  89             );
  90           })
  91         )
  92     }
  93     if (this.reserve[color][p] == 0) return [];
  94     let moves = [];
  95     const forward = color == 'w' ? -1 : 1;
  96     const lastRank = color == 'w' ? 0 : 4;
  97     for (let i = 0; i < V.size.x; i++) {
  98       if (p == V.PAWN && i == lastRank) continue;
  99       for (let j = 0; j < V.size.y; j++) {
 100         if (
 101           this.board[i][j] == V.EMPTY &&
 102           (p != V.PAWN || allowedFiles.includes(j))
 103         ) {
 104           let mv = new Move({
 105             appear: [
 106               new PiPo({
 107                 x: i,
 108                 y: j,
 109                 c: color,
 110                 p: p
 111               })
 112             ],
 113             vanish: [],
 114             start: { x: x, y: y }, //a bit artificial...
 115             end: { x: i, y: j }
 116           });
 117           if (p == V.PAWN) {
 118             // Do not drop on checkmate:
 119             this.play(mv);
 120             const res = (this.underCheck(oppCol) && !this.atLeastOneMove());
 121             this.undo(mv);
 122             if (res) continue;
 123           }
 124           moves.push(mv);
 125         }
 126       }
 127     }
 128     return moves;
 129   }
 130
 131   getSlideNJumpMoves([x, y], steps, options) {
 132     options = options || {};
 133     const color = this.turn;
 134     const oneStep = options.oneStep;
 135     const forcePromoteOnLastRank = options.force;
 136     const promoteInto = options.promote;
 137     const lastRank = (color == 'w' ? 0 : 4);
 138     let moves = [];
 139     outerLoop: for (let step of steps) {
 140       let i = x + step[0];
 141       let j = y + step[1];
 142       while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
 143         if (i != lastRank || !forcePromoteOnLastRank)
 144           moves.push(this.getBasicMove([x, y], [i, j]));
 145         if (i == lastRank && !!promoteInto) {
 146           moves.push(
 147             this.getBasicMove(
 148               [x, y], [i, j], { c: color, p: promoteInto })
 149           );
 150         }
 151         if (oneStep) continue outerLoop;
 152         i += step[0];
 153         j += step[1];
 154       }
 155       if (V.OnBoard(i, j) && this.canTake([x, y], [i, j])) {
 156         if (i != lastRank || !forcePromoteOnLastRank)
 157           moves.push(this.getBasicMove([x, y], [i, j]));
 158         if (i == lastRank && !!promoteInto) {
 159           moves.push(
 160             this.getBasicMove(
 161               [x, y], [i, j], { c: color, p: promoteInto })
 162           );
 163         }
 164       }
 165     }
 166     return moves;
 167   }
 168
 169   static get SEARCH_DEPTH() {
 170     return 3;
 171   }
 172
 173 };