variants/Antiking1/class.js

   1 import ChessRules from "/base_rules.js";
   2 import AbstractAntikingRules from "/variants/_Antiking/class.js";
   3
   4 export default class Antiking1Rules extends AbstractAntikingRules {
   5
   6   get hasCastle() {
   7     return false;
   8   }
   9   get hasEnpassant() {
  10     return false;
  11   }
  12
  13   pieces(color, x, y) {
  14     const pawnShift = (color == "w" ? -1 : 1);
  15     let res = super.pieces(color, x, y);
  16     res['p'].moves = [
  17       {
  18         steps: [[pawnShift, 1], [pawnShift, -1]],
  19         range: 1
  20       }
  21     ];
  22     res['p'].attack = [
  23       {
  24         steps: [[pawnShift, 0]],
  25         range: 1
  26       }
  27     ];
  28     return res;
  29   }
  30
  31   genRandInitFen() {
  32     // Always deterministic setup
  33     return (
  34       '2prbkqA/2p1nnbr/2pppppp/8/8/PPPPPP2/RBNN1P2/aQKBRP2 w 0 ' +
  35       '{"flags":"KAka"}'
  36     );
  37   }
  38
  39   // (Anti)King flags at 1 (true) if they can knight-jump
  40   setFlags(fenFlags) {
  41     this.kingFlags = { w: {}, b: {} };
  42     for (let i=0; i<fenFlags.length; i++) {
  43       const white = fenFlags.charCodeAt(i) <= 90;
  44       const curChar = fenFlags.charAt(i).toLowerCase();
  45       this.kingFlags[white ? 'w' : 'b'][curChar] = true;
  46     }
  47   }
  48
  49   getFlagsFen() {
  50     return (
  51       Array.prototype.concat.apply(
  52         ['w', 'b'].map(c => Object.keys(this.kingFlags[c]))
  53       ).join("")
  54     );
  55   }
  56
  57   getPotentialMovesFrom([x, y]) {
  58     const color = this.turn;
  59     let moves = super.getPotentialMovesFrom([x, y]);
  60     if (this.kingFlags[color][this.getPiece(x, y)]) {
  61       // Allow knight jump (king or antiking)
  62       const knightMoves = super.getPotentialMovesOf('n', [x, y]);
  63       // Remove captures (TODO: could be done more efficiently...)
  64       moves = moves.concat(knightMoves.filter(m => m.vanish.length == 1));
  65     }
  66     return moves;
  67   }
  68
  69   prePlay(move) {
  70     super.prePlay(move);
  71     // Update king+antiking flags
  72     const piece = move.vanish[0].p;
  73     if (this.isKing(0, 0, piece))
  74       delete this.kingFlags[move.vanish[0].c][piece];
  75   }
  76
  77 };