// reset after Add
MoveGenState Reset()
{
From = Position;
To = null;
_move = MoveModel.Create(TurnPlayer, Position, Piece);
_changes.Clear();
_captures.Clear();
return(this);
}
// create new board by applying move to old one
static BoardModel CreateMoved(BoardModel board, MoveModel move)
{
return(new BoardModel {
_game = board._game,
LastBoard = board,
Def = board.Def,
LastMove = move,
LastTurn = board.Turn,
_turnindex = board._turnindex + 1,
_playedpieces = new Dictionary <PositionValue, PieceModel>(board._playedpieces),
_offstores = new Dictionary <Pair <PlayerValue, PieceValue>, int>(board._offstores),
}.ApplyMove(move).GenerateNewState());
}
// generate actual moves if not done already during condition checking
// assumes CurrentPlayer set already
internal void GenerateMoves()
{
if (!_donemovegen)
{
LegalMoves.AddRange(_game.CreateDrops(this));
LegalMoves.AddRange(_game.CreateMoves(this));
var passoption = _game.Def.GetProperty("pass turn") ?? OptionValue.False;
var allowpass = passoption.Equals(OptionValue.True) ||
(LegalMoves.Count == 0 && passoption.Equals(OptionValue.Forced));
if (allowpass)
{
LegalMoves.Insert(0, MoveModel.Create(Turn.TurnPlayer, PositionValue.None, PieceValue.None));
}
_donemovegen = true;
}
}
// privately apply move to copy of board
BoardModel ApplyMove(MoveModel move)
{
foreach (var m in move.MoveParts)
{
switch (m.Kind)
{
case MoveKinds.Drop:
CheckCapture(m.Position);
_playedpieces[m.Position] = _game.CreatePiece(m.Player, m.Piece);
IncOffStore(m.Player, m.Piece, -1);
break;
case MoveKinds.Copy:
CheckCapture(m.Final);
var ppc = _playedpieces[m.Position];
_playedpieces[m.Final] = (ppc.Piece == m.Piece) ? ppc : ppc.Create(m);
break;
case MoveKinds.Move:
CheckCapture(m.Final);
var ppm = _playedpieces[m.Position];
_playedpieces[m.Final] = (ppm.Piece == m.Piece) ? ppm : ppm.Create(m);
if (m.Final != m.Position)
{
_playedpieces.Remove(m.Position);
}
break;
case MoveKinds.Take:
CheckCapture(m.Position);
_playedpieces.Remove(m.Position);
break;
case MoveKinds.Owner:
case MoveKinds.Piece:
case MoveKinds.Attrib:
_playedpieces[m.Position] = _playedpieces[m.Position].Create(m);
break;
default:
throw Error.Assert("apply {0}", move);
}
}
return(this);
}