generateGatingMoves method

List<GatingMove> generateGatingMoves(StandardMove base)

Generates a move for each gating possibility for the base move. Doesn't include the option where a piece is not gated.

Implementation

List<GatingMove> generateGatingMoves(StandardMove base) {
  if (state.gates == null || state.gates!.isEmpty) return [];
  int gFile = size.file(base.from);
  Square piece = board[base.from];
  Colour colour = piece.colour;
  if (piece.isEmpty) return [];
  if (!(state.virginFiles[colour].contains(gFile))) return [];
  List<GatingMove> moves = [];
  void addGatingMove(int p) {
    moves.add(GatingMove(child: base, dropPiece: p));
    if (base.castling) {
      moves.add(
        GatingMove(child: base, dropPiece: p, dropOnRookSquare: true),
      );
    }
  }

  if (variant.gatingMode == GatingMode.flex) {
    for (int p in state.gates![colour]) {
      addGatingMove(p);
    }
  } else if (variant.gatingMode == GatingMode.fixed) {
    int p = state.gates![colour][gFile];
    if (p != 0) {
      addGatingMove(p);
    }
  }
  return moves;
}