- // Keep track of position keys along the setup moves (from start position to the
- // position just before to start searching). Needed by repetition draw detection.
- Search::StateStackPtr SetupStates;
-
- void set_option(istringstream& up);
- void set_position(Position& pos, istringstream& up);
- void go(const Position& pos, istringstream& up);
-}
-
-
-/// Wait for a command from the user, parse this text string as an UCI command,
-/// and call 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.
-
-void UCI::loop(const string& args) {
-
- Position pos(StartFEN, false, Threads.main_thread()); // The root position
- string token, cmd = args;
-
- do {
- if (args.empty() && !getline(cin, cmd)) // Block here waiting for input
- cmd = "quit";
-
- istringstream is(cmd);
-
- is >> skipws >> token;
-
- if (token == "quit" || token == "stop" || token == "ponderhit")
- {
- // GUI sends 'ponderhit' to tell us to ponder on the same move the
- // opponent has played. In case Signals.stopOnPonderhit is set we are
- // waiting for 'ponderhit' to stop the search (for instance because we
- // already ran out of time), otherwise we should continue searching but
- // switching from pondering to normal search.
- if (token != "ponderhit" || Search::Signals.stopOnPonderhit)
- {
- Search::Signals.stop = true;
- Threads.main_thread()->notify_one(); // Could be sleeping
- }
- else
- Search::Limits.ponder = false;
- }
- else if (token == "perft" && (is >> token)) // Read perft depth
- {
- stringstream ss;
-
- ss << Options["Hash"] << " "
- << Options["Threads"] << " " << token << " current perft";
-
- benchmark(pos, ss);
- }
- else if (token == "key")
- sync_cout << hex << uppercase << setfill('0')
- << "position key: " << setw(16) << pos.key()
- << "\nmaterial key: " << setw(16) << pos.material_key()
- << "\npawn key: " << setw(16) << pos.pawn_key()
- << dec << sync_endl;
-
- else if (token == "uci")
- sync_cout << "id name " << engine_info(true)
- << "\n" << Options
- << "\nuciok" << sync_endl;
-
- else if (token == "ucinewgame") TT.clear();
- else if (token == "go") go(pos, is);
- else if (token == "position") set_position(pos, is);
- else if (token == "setoption") set_option(is);
- else if (token == "flip") pos.flip();
- else if (token == "bench") benchmark(pos, is);
- else if (token == "d") sync_cout << pos.pretty() << sync_endl;
- else if (token == "isready") sync_cout << "readyok" << sync_endl;
- else if (token == "eval") sync_cout << Eval::trace(pos) << sync_endl;
- else
- sync_cout << "Unknown command: " << cmd << sync_endl;
-
- } while (token != "quit" && args.empty()); // Args have one-shot behaviour
-
- Threads.wait_for_think_finished(); // Cannot quit while search is running
-}
-