2 Stockfish, a UCI chess playing engine derived from Glaurung 2.1
3 Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
4 Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
6 Stockfish is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 Stockfish is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
37 #include "ucioption.h"
42 //// Local definitions:
47 // FEN string for the initial position
48 const string StartPositionFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
50 // UCIInputParser is a class for parsing UCI input. The class
51 // is actually a string stream built on a given input string.
52 typedef istringstream UCIInputParser;
55 bool handle_command(Position& pos, const string& command);
56 void set_option(UCIInputParser& uip);
57 void set_position(Position& pos, UCIInputParser& uip);
58 bool go(Position& pos, UCIInputParser& uip);
59 void perft(Position& pos, UCIInputParser& uip);
67 /// uci_main_loop() is the only global function in this file. It is
68 /// called immediately after the program has finished initializing.
69 /// The program remains in this loop until it receives the "quit" UCI
70 /// command. It waits for a command from the user, and passes this
71 /// command to handle_command and also intercepts EOF from stdin,
72 /// by translating EOF to the "quit" command. This ensures that Stockfish
73 /// exits gracefully if the GUI dies unexpectedly.
75 void uci_main_loop() {
77 Position pos(StartPositionFEN, 0); // The root position
81 // Wait for a command from stdin
82 if (!getline(cin, command))
85 } while (handle_command(pos, command));
95 // handle_command() takes a text string as input, uses a
96 // UCIInputParser object to parse this text string as a UCI command,
97 // and calls the appropriate functions. In addition to the UCI
98 // commands, the function also supports a few debug commands.
100 bool handle_command(Position& pos, const string& command) {
102 UCIInputParser uip(command);
105 if (!(uip >> token)) // operator>>() skips any whitespace
116 cout << "id name " << engine_name()
117 << "\nid author Tord Romstad, Marco Costalba, Joona Kiiski\n";
119 cout << "uciok" << endl;
121 else if (token == "ucinewgame")
122 pos.from_fen(StartPositionFEN);
123 else if (token == "isready")
124 cout << "readyok" << endl;
125 else if (token == "position")
126 set_position(pos, uip);
127 else if (token == "setoption")
130 // The remaining commands are for debugging purposes only.
131 // Perhaps they should be removed later in order to reduce the
132 // size of the program binary.
133 else if (token == "d")
135 else if (token == "flip")
137 Position p(pos, pos.thread());
140 else if (token == "eval")
143 cout << "Incremental mg: " << mg_value(pos.value())
144 << "\nIncremental eg: " << eg_value(pos.value())
145 << "\nFull eval: " << evaluate(pos, evalMargin) << endl;
147 else if (token == "key")
148 cout << "key: " << hex << pos.get_key()
149 << "\nmaterial key: " << pos.get_material_key()
150 << "\npawn key: " << pos.get_pawn_key() << endl;
151 else if (token == "perft")
154 cout << "Unknown command: " << command << endl;
160 // set_position() is called when Stockfish receives the "position" UCI
161 // command. The input parameter is a UCIInputParser. It is assumed
162 // that this parser has consumed the first token of the UCI command
163 // ("position"), and is ready to read the second token ("startpos"
164 // or "fen", if the input is well-formed).
166 void set_position(Position& pos, UCIInputParser& uip) {
170 if (!(uip >> token)) // operator>>() skips any whitespace
173 if (token == "startpos")
174 pos.from_fen(StartPositionFEN);
175 else if (token == "fen")
178 while (uip >> token && token != "moves")
188 if (token != "moves")
191 if (token == "moves")
197 move = move_from_string(pos, token);
198 pos.do_move(move, st);
199 if (pos.rule_50_counter() == 0)
200 pos.reset_game_ply();
202 pos.inc_startpos_ply_counter(); //FIXME: make from_fen to support this and rule50
204 // Our StateInfo st is about going out of scope so copy
205 // its content inside pos before it disappears.
212 // set_option() is called when Stockfish receives the "setoption" UCI
213 // command. The input parameter is a UCIInputParser. It is assumed
214 // that this parser has consumed the first token of the UCI command
215 // ("setoption"), and is ready to read the second token ("name", if
216 // the input is well-formed).
218 void set_option(UCIInputParser& uip) {
220 string token, name, value;
222 if (!(uip >> token)) // operator>>() skips any whitespace
225 if (token != "name" || !(uip >> name))
228 while (uip >> token && token != "value")
229 name += (" " + token);
231 if (Options.find(name) == Options.end())
233 cout << "No such option: " << name << endl;
237 if (token != "value" || !(uip >> value))
239 Options[name].set_value("true");
244 value += (" " + token);
246 Options[name].set_value(value);
250 // go() is called when Stockfish receives the "go" UCI command. The
251 // input parameter is a UCIInputParser. It is assumed that this
252 // parser has consumed the first token of the UCI command ("go"),
253 // and is ready to read the second token. The function sets the
254 // thinking time and other parameters from the input string, and
255 // calls think() (defined in search.cpp) with the appropriate
256 // parameters. Returns false if a quit command is received while
257 // thinking, returns true otherwise.
259 bool go(Position& pos, UCIInputParser& uip) {
263 int time[2] = {0, 0}, inc[2] = {0, 0};
264 int movesToGo = 0, depth = 0, nodes = 0, moveTime = 0;
265 bool infinite = false, ponder = false;
266 Move searchMoves[MOVES_MAX];
268 searchMoves[0] = MOVE_NONE;
272 if (token == "infinite")
274 else if (token == "ponder")
276 else if (token == "wtime")
278 else if (token == "btime")
280 else if (token == "winc")
282 else if (token == "binc")
284 else if (token == "movestogo")
286 else if (token == "depth")
288 else if (token == "nodes")
290 else if (token == "movetime")
292 else if (token == "searchmoves")
296 searchMoves[numOfMoves++] = move_from_string(pos, token);
298 searchMoves[numOfMoves] = MOVE_NONE;
304 return think(pos, infinite, ponder, time, inc, movesToGo,
305 depth, nodes, moveTime, searchMoves);
308 void perft(Position& pos, UCIInputParser& uip) {
316 tm = get_system_time();
318 n = perft(pos, depth * ONE_PLY);
320 tm = get_system_time() - tm;
321 std::cout << "\nNodes " << n
322 << "\nTime (ms) " << tm
323 << "\nNodes/second " << int(n / (tm / 1000.0)) << std::endl;