variants/Suction/class.js

   1 import ChessRules from "/base_rules.js";
   2 import GiveawayRules from "/variants/Giveaway/class.js";
   3 import PiPo from "/utils/PiPo.js";
   4 import Move from "/utils/Move.js";
   5
   6 export default class SuctionRules extends ChessRules {
   7
   8   static get Options() {
   9     return {
  10       select: C.Options.select,
  11       styles: [
  12         "balance",
  13         "capture",
  14         "cylinder",
  15         "dark",
  16         "doublemove",
  17         "madrasi",
  18         "progressive",
  19         "teleport"
  20       ]
  21     };
  22   }
  23
  24   get pawnPromotions() {
  25     return ['p']; //no promotions
  26   }
  27
  28   get hasFlags() {
  29     return false;
  30   }
  31
  32   setOtherVariables(fenParsed) {
  33     super.setOtherVariables(fenParsed);
  34     this.cmove = null;
  35     const cmove_str = fenParsed.cmove;
  36     if (cmove_str != "-") {
  37       this.cmove = {
  38         start: C.SquareToCoords(cmove_str.substr(0, 2)),
  39         end: C.SquareToCoords(cmove_str.substr(2))
  40       };
  41     }
  42   }
  43
  44   genRandInitFen(seed) {
  45     const options = Object.assign({mode: "suicide"}, this.options);
  46     const gr = new GiveawayRules({options: options, genFenOnly: true});
  47     const baseFen = gr.genRandInitFen(seed);
  48     // Add empty cmove:
  49     const fenParts = baseFen.split(" ");
  50     let others = JSON.parse(fenParts[3]);
  51     others["cmove"] = "-";
  52     return fenParts.slice(0, 3).join(" ") + " " + JSON.stringify(others);
  53   }
  54
  55   getFen() {
  56     const cmoveFen = !this.cmove
  57       ? "-"
  58       : C.CoordsToSquare(this.cmove.start) + C.CoordsToSquare(this.cmove.end);
  59     return super.getFen().slice(0, -1) + ',"cmove":"' + cmoveFen + '"}';
  60   }
  61
  62   getBasicMove([sx, sy], [ex, ey]) {
  63     let move = super.getBasicMove([sx, sy], [ex, ey]);
  64     if (move.vanish.length == 2) {
  65       move.appear.push(
  66         new PiPo({
  67           x: sx,
  68           y: sy,
  69           c: move.vanish[1].c,
  70           p: move.vanish[1].p
  71         })
  72       );
  73     }
  74     return move;
  75   }
  76
  77   canIplay(x, y) {
  78     return this.getPiece(x, y) != 'k' && super.canIplay(x, y);
  79   }
  80
  81   // Does m2 un-do m1 ? (to disallow undoing captures)
  82   oppositeMoves(m1, m2) {
  83     return (
  84       !!m1 &&
  85       m2.vanish.length == 2 &&
  86       m1.start.x == m2.start.x &&
  87       m1.end.x == m2.end.x &&
  88       m1.start.y == m2.start.y &&
  89       m1.end.y == m2.end.y
  90     );
  91   }
  92
  93   filterValid(moves) {
  94     return moves.filter(m => !this.oppositeMoves(this.cmove, m));
  95   }
  96
  97   postPlay(move) {
  98     super.postPlay(move);
  99     this.cmove =
 100       (move.vanish.length == 2 ? {start: move.start, end: move.end} : null);
 101   }
 102
 103   atLeastOneMove() {
 104     return true;
 105   }
 106
 107   getCurrentScore() {
 108     const color = this.turn;
 109     const kingPos = super.searchKingPos(color);
 110     if (color == "w" && kingPos[0][0] == 0) return "0-1";
 111     if (color == "b" && kingPos[0][0] == this.size.x - 1) return "1-0";
 112     // King is not on the opposite edge: game not over
 113     return "*";
 114   }
 115
 116   // Better animation for swaps
 117   customAnimate(move, segments, cb) {
 118     if (move.vanish.length < 2)
 119       return 0;
 120     super.animateMoving(move.end, move.start, null,
 121                         segments.reverse().map(s => s.reverse()), cb);
 122     return 1;
 123   }
 124
 125 };