Add Discoduel, draft Dobutsu, some code cleaning

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

diff --git a/variants/Discoduel/class.js b/variants/Discoduel/class.js
new file mode 100644 (file)
index 0000000..c081b31
--- /dev/null
+++ b/variants/Discoduel/class.js
@@ -0,0 +1,51 @@
+import ChessRules from "/base_rules.js";
+import {ArrayFun} from "/utils/array.js"
+
+export default class DiscoduelRules extends ChessRules {
+
+  static get Options() {
+    return {}; //nothing would make sense
+  }
+
+  get pawnPromotions() {
+    return ['p'];
+  }
+
+  get hasFlags() {
+    return false;
+  }
+
+  genRandInitBaseFen() {
+    return {
+      fen: "1n4n1/8/8/8/8/8/PPPPPPPP/8",
+      o: {}
+    };
+  }
+
+  getPotentialMovesFrom([x, y]) {
+    const moves = super.getPotentialMovesFrom([x, y]);
+    if (this.turn == 'b')
+      // Prevent pawn captures on last rank:
+      return moves.filter(m => m.vanish.length == 1 || m.vanish[1].x != 0);
+    return moves;
+  }
+
+  filterValid(moves) {
+    return moves;
+  }
+
+  getCurrentScore() {
+    // No real winning condition (promotions count...)
+    if (
+      ArrayFun.range(1, this.size.x).every(row_idx => {
+        this.board[row_idx].every(square => square.charAt(0) != 'w')
+      })
+      ||
+      !this.atLeastOneMove(this.turn)
+    ) {
+      return "1/2";
+    }
+    return "*";
+  }
+
+};