Add Horde variant + fix typos

[vchess.git] / client / src / variants / Horde.js

diff --git a/client/src/variants/Horde.js b/client/src/variants/Horde.js
new file mode 100644 (file)
index 0000000..e61803b
--- /dev/null
+++ b/client/src/variants/Horde.js
@@ -0,0 +1,69 @@
+import { ChessRules } from "@/base_rules";
+
+export class HordeRules extends ChessRules {
+  static get HasFlags() {
+    return false;
+  }
+
+  static IsGoodPosition() {
+    // At least one white unit, and exactly one black king:
+    if (position.length == 0) return false;
+    const rows = position.split("/");
+    if (rows.length != V.size.x) return false;
+    let things = { "k": 0, "w": false };
+    for (let row of rows) {
+      let sumElts = 0;
+      for (let i = 0; i < row.length; i++) {
+        if (row[i] == 'k') things['k']++;
+        if (V.PIECES.includes(row[i].toLowerCase())) {
+          const rowCharCode = row[i].charCodeAt(0);
+          if (rowCharCode >= 65 && rowCharCode <= 90) {
+            // No white king:
+            if (row[i] == 'K') return false;
+            if (!things['w']) things['w'] = true;
+          }
+          sumElts++;
+        } else {
+          const num = parseInt(row[i]);
+          if (isNaN(num)) return false;
+          sumElts += num;
+        }
+      }
+      if (sumElts != V.size.y) return false;
+    }
+    if (things[''] != 1 || !things['w']) return false;
+    return true;
+  }
+
+  static GenRandInitFen(randomness) {
+    if (randomness == 2) randomness--;
+    const fen = ChessRules.GenRandInitFen(randomness);
+    return (
+      // 27 first chars are 3 rows + 3 slashes
+      fen.substr(0, 27)
+      // En passant available, but no castle:
+      .concat("1PP2PP1/PPPPPPPP/PPPPPPPP/PPPPPPPP/PPPPPPPP w 0 -")
+    );
+  }
+
+  getCurrentScore() {
+    if (this.turn == 'w') {
+      // Do I have any unit remaining? If not, I lost.
+      // If yes and no available move, draw.
+      let somethingRemains = false;
+      outerLoop: for (let i=0; i<8; i++) {
+        for (let j=0; j<8; j++) {
+          if (this.board[i][j] != V.EMPTY && this.getColor(i, j) == 'w') {
+            somethingRemains = true;
+            break outerLoop;
+          }
+        }
+      }
+      if (!somethingRemains) return "0-1";
+      if (this.atLeastOneMove()) return "*";
+      return "1/2";
+    }
+    // From black side, just run usual checks:
+    return super.getCurrentScore();
+  }
+};