Fix Antiking

[xogo.git] / variants / _Antiking / class.js

diff --git a/variants/_Antiking/class.js b/variants/_Antiking/class.js
new file mode 100644 (file)
index 0000000..e92edab
--- /dev/null
+++ b/variants/_Antiking/class.js
@@ -0,0 +1,81 @@
+import ChessRules from "/base_rules.js";
+
+export default class AbstractAntikingRules extends ChessRules {
+
+  static get Aliases() {
+    return Object.assign({'A': AbstractAntikingRules}, ChessRules.Aliases);
+  }
+
+  static get Options() {
+    return {
+      styles: [
+        "atomic",
+        "balance",
+        "cannibal",
+        "capture",
+        "crazyhouse",
+        "doublemove",
+        "madrasi",
+        "progressive",
+        "recycle",
+        "rifle",
+        "teleport",
+        "zen"
+      ]
+    };
+  }
+
+  pieces(color, x, y) {
+    return Object.assign(
+      {
+        'a': {
+          // Move like a king, no attacks
+          "class": "antiking",
+          moves: super.pieces(color, x, y)['k'].moves,
+          attack: []
+        }
+      },
+      super.pieces(color, x, y)
+    );
+  }
+
+  isKing(x, y, p) {
+    if (!p)
+      p = this.getPiece(x, y);
+    return ['k', 'a'].includes(p);
+  }
+
+  // NOTE: canTake includes (wrong) captures of antiking,
+  // to not go to low-level using findDestSquares()
+  canTake([x1, y1], [x2, y2]) {
+    const piece1 = this.getPiece(x1, y1);
+    const color1 = this.getColor(x1, y1);
+    const color2 = this.getColor(x2, y2);
+    return (
+      (piece1 != 'a' && color1 != color2) ||
+      (piece1 == 'a' && color1 == color2)
+    );
+  }
+
+  // Remove captures of antiking (see above)
+  getPotentialMovesFrom([x, y]) {
+    return super.getPotentialMovesFrom([x, y]).filter(m =>
+      m.vanish.length == 1 || m.vanish[1].p != 'a');
+  }
+
+  underCheck(squares, color) {
+    let res = false;
+    squares.forEach(sq => {
+      switch (this.getPiece(sq[0], sq[1])) {
+        case 'k':
+          res ||= super.underAttack(sq, color);
+          break;
+        case 'a':
+          res ||= !super.underAttack(sq, color);
+          break;
+      }
+    });
+    return res;
+  }
+
+};