client/src/variants/Kinglet.js

   1 import { ChessRules } from "@/base_rules";
   2 import { SuicideRules } from "@/variants/Suicide";
   3
   4 export class KingletRules extends ChessRules {
   5   static get HasFlags() {
   6     return false;
   7   }
   8
   9   static get PawnSpecs() {
  10     return Object.assign(
  11       {},
  12       ChessRules.PawnSpecs,
  13       { promotions: [V.KING] }
  14     );
  15   }
  16
  17   static IsGoodPosition(position) {
  18     if (position.length == 0) return false;
  19     const rows = position.split("/");
  20     if (rows.length != V.size.x) return false;
  21     // Just check that at least one pawn of each color is there:
  22     let pawns = { "w": 0, "b": 0 };
  23     for (let row of rows) {
  24       let sumElts = 0;
  25       for (let i = 0; i < row.length; i++) {
  26         const lowerRi = row[i].toLowerCase();
  27         if (V.PIECES.includes(lowerRi)) {
  28           if (lowerRi == 'p') pawns[row[i] == lowerRi ? "b" : "w"]++;
  29           sumElts++;
  30         } else {
  31           const num = parseInt(row[i], 10);
  32           if (isNaN(num)) return false;
  33           sumElts += num;
  34         }
  35       }
  36       if (sumElts != V.size.y) return false;
  37     }
  38     if (Object.values(pawns).some(v => v == 0)) return false;
  39     return true;
  40   }
  41
  42   scanKings() {}
  43
  44   filterValid(moves) {
  45     return moves;
  46   }
  47
  48   getCheckSquares() {
  49     return [];
  50   }
  51
  52   // No variables update because no royal king + no castling
  53   prePlay() {}
  54   postPlay() {}
  55   preUndo() {}
  56   postUndo() {}
  57
  58   getCurrentScore() {
  59     const pawnRemain = {
  60       'w': this.board.some(b =>
  61         b.some(cell => cell[0] == 'w' && cell[1] == 'p')),
  62       'b': this.board.some(b =>
  63         b.some(cell => cell[0] == 'b' && cell[1] == 'p'))
  64     }
  65     if (!pawnRemain['w']) return "0-1";
  66     if (!pawnRemain['b']) return "1-0";
  67     if (this.atLeastOneMove()) return "*";
  68     // Stalemate: draw
  69     return "1/2";
  70   }
  71
  72   static GenRandInitFen(randomness) {
  73     return SuicideRules.GenRandInitFen(randomness);
  74   }
  75
  76   static get VALUES() {
  77     // TODO: no clue what correct values would be
  78     return {
  79       p: 5,
  80       r: 4,
  81       n: 3,
  82       b: 3,
  83       q: 7,
  84       k: 4
  85     };
  86   }
  87 };