Add Forward + Doubleorda variants
[vchess.git] / client / src / variants / Capture.js
1 import { ChessRules } from "@/base_rules";
2
3 export class CaptureRules extends ChessRules {
4 // Trim all non-capturing moves
5 static KeepCaptures(moves) {
6 return moves.filter(m => m.vanish.length == 2 && m.appear.length == 1);
7 }
8
9 // Stop at the first capture found (if any)
10 atLeastOneCapture() {
11 const color = this.turn;
12 const oppCol = V.GetOppCol(color);
13 for (let i = 0; i < V.size.x; i++) {
14 for (let j = 0; j < V.size.y; j++) {
15 if (
16 this.board[i][j] != V.EMPTY &&
17 this.getColor(i, j) != oppCol &&
18 this.filterValid(this.getPotentialMovesFrom([i, j])).some(m =>
19 // Warning: discard castle moves
20 m.vanish.length == 2 && m.appear.length == 1)
21 ) {
22 return true;
23 }
24 }
25 }
26 return false;
27 }
28
29 getPossibleMovesFrom(sq) {
30 let moves = this.filterValid(this.getPotentialMovesFrom(sq));
31 const captureMoves = V.KeepCaptures(moves);
32 if (captureMoves.length > 0) return captureMoves;
33 if (this.atLeastOneCapture()) return [];
34 return moves;
35 }
36
37 getAllValidMoves() {
38 const moves = super.getAllValidMoves();
39 if (moves.some(m => m.vanish.length == 2 && m.appear.length == 1))
40 return V.KeepCaptures(moves);
41 return moves;
42 }
43 };