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
   6   static get HasFlags() {
   7     return false;
   8   }
   9
  10   static get PawnSpecs() {
  11     return Object.assign(
  12       {},
  13       ChessRules.PawnSpecs,
  14       { promotions: [V.KING] }
  15     );
  16   }
  17
  18   static IsGoodPosition(position) {
  19     if (position.length == 0) return false;
  20     const rows = position.split("/");
  21     if (rows.length != V.size.x) return false;
  22     // Just check that at least one pawn of each color is there:
  23     let pawns = { "w": 0, "b": 0 };
  24     for (let row of rows) {
  25       let sumElts = 0;
  26       for (let i = 0; i < row.length; i++) {
  27         const lowerRi = row[i].toLowerCase();
  28         if (V.PIECES.includes(lowerRi)) {
  29           if (lowerRi == 'p') pawns[row[i] == lowerRi ? "b" : "w"]++;
  30           sumElts++;
  31         } else {
  32           const num = parseInt(row[i], 10);
  33           if (isNaN(num)) return false;
  34           sumElts += num;
  35         }
  36       }
  37       if (sumElts != V.size.y) return false;
  38     }
  39     if (Object.values(pawns).some(v => v == 0)) return false;
  40     return true;
  41   }
  42
  43   scanKings() {}
  44
  45   filterValid(moves) {
  46     return moves;
  47   }
  48
  49   getCheckSquares() {
  50     return [];
  51   }
  52
  53   // No variables update because no royal king + no castling
  54   prePlay() {}
  55   postPlay() {}
  56   preUndo() {}
  57   postUndo() {}
  58
  59   getCurrentScore() {
  60     const pawnRemain = {
  61       'w': this.board.some(b =>
  62         b.some(cell => cell[0] == 'w' && cell[1] == 'p')),
  63       'b': this.board.some(b =>
  64         b.some(cell => cell[0] == 'b' && cell[1] == 'p'))
  65     }
  66     if (!pawnRemain['w']) return "0-1";
  67     if (!pawnRemain['b']) return "1-0";
  68     if (this.atLeastOneMove()) return "*";
  69     // Stalemate: draw
  70     return "1/2";
  71   }
  72
  73   static GenRandInitFen(randomness) {
  74     return SuicideRules.GenRandInitFen(randomness);
  75   }
  76
  77   static get VALUES() {
  78     // TODO: no clue what correct values would be
  79     return {
  80       p: 5,
  81       r: 4,
  82       n: 3,
  83       b: 3,
  84       q: 7,
  85       k: 4
  86     };
  87   }
  88
  89 };