public Move Parse(State ctx)
{
Location source, destination;
PieceKind?promotionKind;
bool isKingsideCastle = (_input == "O-O" || _input == "0-0");
bool isQueensideCastle = (_input == "O-O-O" || _input == "0-0-0");
if (isKingsideCastle || isQueensideCastle)
{
source = StaticInfo.GetStartLocation(ctx.ActiveSide, PieceKind.King);
destination = isKingsideCastle ? source.Right(2) : source.Left(2);
return(new Move(source, destination));
}
var sourceKind = ReadPieceKind() ?? PieceKind.Pawn;
if (ReadLocation() is Location dest)
{
destination = dest;
promotionKind = ReadPieceKind();
ReadStatus();
if (!CanRead(1))
{
source = InferSource("", ctx, destination, sourceKind, isCapture: false);
return(new Move(source, destination, promotionKind));
}
}
var partialSource = ReadPartialLocation();
bool isCapture = ReadSeparator();
destination = StrictReadLocation();
promotionKind = ReadPieceKind();
ReadStatus();
source = InferSource(partialSource, ctx, destination, sourceKind, isCapture);
return(new Move(source, destination, promotionKind));
}