namespace {
// FEN string for the initial position
- const string StartPositionFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
+ const char* StarFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
// Keep track of position keys along the setup moves (from start position to the
// position just before to start searching). This is needed by draw detection
}
-/// execute_uci_command() takes a string as input, parses this text string as
-/// an UCI command, and calls the appropriate functions. In addition to the
-/// UCI commands, the function also supports a few debug commands.
+/// Wait for a command from the user, parse this text string as an UCI command,
+/// and calls the appropriate functions. Also intercepts EOF from stdin to
+/// ensure that we exit gracefully if the GUI dies unexpectedly. In addition to
+/// the UCI commands, the function also supports a few debug commands.
-bool execute_uci_command(const string& cmd) {
+void uci_loop() {
- static Position pos(StartPositionFEN, false, 0); // The root position
+ Position pos(StarFEN, false, 0); // The root position
+ string cmd, token;
+ bool quit = false;
- istringstream is(cmd);
- string token;
+ while (!quit && getline(cin, cmd))
+ {
+ istringstream is(cmd);
- is >> skipws >> token;
+ is >> skipws >> token;
- if (token == "quit")
- return false;
+ if (token == "quit")
+ quit = true;
- if (token == "go")
- return go(pos, is);
+ else if (token == "go")
+ quit = !go(pos, is);
- if (token == "ucinewgame")
- pos.from_fen(StartPositionFEN, false);
+ else if (token == "ucinewgame")
+ pos.from_fen(StarFEN, false);
- else if (token == "isready")
- cout << "readyok" << endl;
+ else if (token == "isready")
+ cout << "readyok" << endl;
- else if (token == "position")
- set_position(pos, is);
+ else if (token == "position")
+ set_position(pos, is);
- else if (token == "setoption")
- set_option(is);
+ else if (token == "setoption")
+ set_option(is);
- else if (token == "perft")
- perft(pos, is);
+ else if (token == "perft")
+ perft(pos, is);
- else if (token == "d")
- pos.print();
+ else if (token == "d")
+ pos.print();
- else if (token == "flip")
- pos.flip();
+ else if (token == "flip")
+ pos.flip();
- else if (token == "eval")
- {
- read_evaluation_uci_options(pos.side_to_move());
- cout << trace_evaluate(pos) << endl;
- }
+ else if (token == "eval")
+ {
+ read_evaluation_uci_options(pos.side_to_move());
+ cout << trace_evaluate(pos) << endl;
+ }
- else if (token == "key")
- cout << "key: " << hex << pos.get_key()
- << "\nmaterial key: " << pos.get_material_key()
- << "\npawn key: " << pos.get_pawn_key() << endl;
+ else if (token == "key")
+ cout << "key: " << hex << pos.get_key()
+ << "\nmaterial key: " << pos.get_material_key()
+ << "\npawn key: " << pos.get_pawn_key() << endl;
- else if (token == "uci")
- cout << "id name " << engine_name()
- << "\nid author " << engine_authors()
- << "\n" << Options.print_all()
- << "\nuciok" << endl;
- else
- cout << "Unknown command: " << cmd << endl;
-
- return true;
+ else if (token == "uci")
+ cout << "id name " << engine_name()
+ << "\nid author " << engine_authors()
+ << "\n" << Options.print_all()
+ << "\nuciok" << endl;
+ else
+ cout << "Unknown command: " << cmd << endl;
+ }
}
if (token == "startpos")
{
- fen = StartPositionFEN;
+ fen = StarFEN;
is >> token; // Consume "moves" token if any
}
else if (token == "fen")