client/src/variants/Hamilton.js

   1 import { ChessRules, Move, PiPo } from "@/base_rules";
   2 import { randInt } from "@/utils/alea";
   3
   4 export class HamiltonRules extends ChessRules {
   5   static get HasFlags() {
   6     return false;
   7   }
   8
   9   static get HasEnpassant() {
  10     return false;
  11   }
  12
  13   get showFirstTurn() {
  14     return true;
  15   }
  16
  17   static get HOLE() {
  18     return "xx";
  19   }
  20
  21   hoverHighlight(x, y) {
  22     return this.movesCount == 0;
  23   }
  24
  25   static board2fen(b) {
  26     if (b[0] == 'x') return 'x';
  27     return ChessRules.board2fen(b);
  28   }
  29
  30   static fen2board(f) {
  31     if (f == 'x') return V.HOLE;
  32     return ChessRules.fen2board(f);
  33   }
  34
  35   getPpath(b) {
  36     if (b[0] == 'x') return "Hamilton/hole";
  37     return b;
  38   }
  39
  40   static get PIECES() {
  41     return [ChessRules.KNIGHT];
  42   }
  43
  44   static IsGoodPosition(position) {
  45     if (position.length == 0) return false;
  46     const rows = position.split("/");
  47     if (rows.length != V.size.x) return false;
  48     for (let row of rows) {
  49       let sumElts = 0;
  50       for (let i = 0; i < row.length; i++) {
  51         if (['x'].concat(V.PIECES).includes(row[i].toLowerCase())) sumElts++;
  52         else {
  53           const num = parseInt(row[i], 10);
  54           if (isNaN(num)) return false;
  55           sumElts += num;
  56         }
  57       }
  58       if (sumElts != V.size.y) return false;
  59     }
  60     return true;
  61   }
  62
  63   static GenRandInitFen() {
  64     return "8/8/8/8/8/8/8/8 w 0";
  65   }
  66
  67   canIplay(side, [x, y]) {
  68     return side == this.turn;
  69   }
  70
  71   // Initiate the game by choosing a square for the knight:
  72   doClick(square) {
  73     if (this.movesCount > 0) return null;
  74     return new Move({
  75       appear: [
  76         new PiPo({ x: square[0], y: square[1], c: 'w', p: V.KNIGHT })
  77       ],
  78       vanish: [],
  79       start: { x: -1, y: -1 }
  80     });
  81   }
  82
  83   getAllPotentialMoves() {
  84     if (this.movesCount == 0) {
  85       return [...Array(64).keys()].map(k => {
  86         const i = k % 8;
  87         const j = (k - i) / 8;
  88         return new Move({
  89           appear: [
  90             new PiPo({ x: i, y: j, c: 'w', p: V.KNIGHT })
  91           ],
  92           vanish: [],
  93           start: { x: -1, y: -1 }
  94         });
  95       });
  96     }
  97     for (let i=0; i<8; i++) {
  98       for (let j=0; j<8; j++) {
  99         if (!([V.EMPTY, V.HOLE].includes(this.board[i][j])))
 100           return this.getPotentialKnightMoves([i, j]);
 101       }
 102     }
 103     return [];
 104   }
 105
 106   getPotentialKnightMoves([x, y]) {
 107     return (
 108       V.steps[V.KNIGHT].filter(
 109         s => {
 110           const [i, j] = [x + s[0], y + s[1]];
 111           return (V.OnBoard(i, j) && this.board[i][j] != V.HOLE);
 112         }
 113       ).map(s => {
 114         return this.getBasicMove([x, y], [x + s[0], y + s[1]]);
 115       })
 116     );
 117   }
 118
 119   atLeastOneMove() {
 120     if (this.movesCount == 0) return true;
 121     for (let i=0; i<8; i++) {
 122       for (let j=0; j<8; j++) {
 123         if (!([V.EMPTY, V.HOLE].includes(this.board[i][j])))
 124           return this.getPotentialKnightMoves([i, j]).length > 0;
 125       }
 126     }
 127     return false;
 128   }
 129
 130   filterValid(moves) {
 131     return moves;
 132   }
 133
 134   static PlayOnBoard(board, move) {
 135     if (move.vanish.length > 0)
 136       board[move.vanish[0].x][move.vanish[0].y] = V.HOLE;
 137     for (let psq of move.appear) board[psq.x][psq.y] = psq.c + psq.p;
 138   }
 139
 140   getCheckSquares() {
 141     return [];
 142   }
 143
 144   getCurrentScore() {
 145     if (this.atLeastOneMove()) return "*";
 146     // No valid move: I lose
 147     return this.turn == "w" ? "0-1" : "1-0";
 148   }
 149
 150   getComputerMove() {
 151     const moves = this.getAllValidMoves();
 152     // Just a random mover for now...
 153     return moves[randInt(moves.length)];
 154   }
 155
 156   getNotation(move) {
 157     if (move.vanish.length > 0) return super.getNotation(move);
 158     // First game move:
 159     return "N@" + V.CoordsToSquare(move.end);
 160   }
 161 };