// set_position() is called when engine receives the "position" UCI
// command. The function sets up the position described in the given
// fen string ("fen") or the starting position ("startpos") and then
// makes the moves given in the following move list ("moves").
internal static void set_position(Position pos, Stack<string> stack)
{
Move m;
string token, fen = string.Empty;
token = stack.Pop();
if (token == "startpos")
{
fen = StartFEN;
if (stack.Count > 0) { token = stack.Pop(); } // Consume "moves" token if any
}
else if (token == "fen")
while ((stack.Count > 0) && (token = stack.Pop()) != "moves")
fen += token + " ";
else
return;
pos.from_fen(fen, bool.Parse(OptionMap.Instance["UCI_Chess960"].v), Threads.main_thread());
// Parse move list (if any)
while ((stack.Count > 0) && (m = Utils.move_from_uci(pos, token = stack.Pop())) != MoveC.MOVE_NONE)
{
pos.do_move(m, StateRingBuf[SetupStatePos]);
// Increment pointer to StateRingBuf circular buffer
SetupStatePos = (SetupStatePos + 1) % 102;
}
}
