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 Marco Costalba
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/>.
39 #include "ucioption.h"
43 //// Local definitions:
48 // UCIInputParser is a class for parsing UCI input. The class
49 // is actually a string stream built on a given input string.
51 typedef std::istringstream UCIInputParser;
53 // The root position. This is set up when the user (or in practice, the GUI)
54 // sends the "position" UCI command. The root position is sent to the think()
55 // function when the program receives the "go" command.
56 Position RootPosition;
60 void handle_command(const std::string &command);
61 void set_option(UCIInputParser &uip);
62 void set_position(UCIInputParser &uip);
63 void go(UCIInputParser &uip);
71 /// uci_main_loop() is the only global function in this file. It is
72 /// called immediately after the program has finished initializing.
73 /// The program remains in this loop until it receives the "quit" UCI
76 void uci_main_loop() {
78 RootPosition.from_fen(StartPosition);
91 // get_command() waits for a command from the user, and passes
92 // this command to handle_command. get_command also intercepts
93 // EOF from stdin, by translating EOF to the "quit" command. This
94 // ensures that Stockfish exits gracefully if the GUI dies
101 if (!std::getline(std::cin, command))
104 handle_command(command);
108 // handle_command() takes a text string as input, uses a
109 // UCIInputParser object to parse this text string as a UCI command,
110 // and calls the appropriate functions. In addition to the UCI
111 // commands, the function also supports a few debug commands.
113 void handle_command(const std::string &command) {
115 UCIInputParser uip(command);
118 uip >> token; // operator >> skips any whitespace
126 else if (token == "uci")
128 std::cout << "id name " << engine_name() << std::endl
129 << "id author Tord Romstad, Marco Costalba"
132 std::cout << "uciok" << std::endl;
134 else if (token == "ucinewgame")
137 Position::init_piece_square_tables();
138 RootPosition.from_fen(StartPosition);
140 else if (token == "isready")
141 std::cout << "readyok" << std::endl;
142 else if (token == "position")
144 else if (token == "setoption")
146 else if (token == "go")
149 // The remaining commands are for debugging purposes only.
150 // Perhaps they should be removed later in order to reduce the
151 // size of the program binary.
152 else if (token == "d")
153 RootPosition.print();
154 else if (token == "flip")
156 Position p(RootPosition);
157 RootPosition.flipped_copy(p);
159 else if (token == "eval")
162 std::cout << "Incremental mg: " << RootPosition.mg_value()
164 std::cout << "Incremental eg: " << RootPosition.eg_value()
166 std::cout << "Full eval: "
167 << evaluate(RootPosition, ei, 0)
170 else if (token == "key")
172 std::cout << "key: " << std::hex << RootPosition.get_key()
173 << " material key: " << RootPosition.get_material_key()
174 << " pawn key: " << RootPosition.get_pawn_key()
179 std::cout << "Unknown command: " << command << std::endl;
183 std::cout << token << std::endl;
189 // set_position() is called when Stockfish receives the "position" UCI
190 // command. The input parameter is a UCIInputParser. It is assumed
191 // that this parser has consumed the first token of the UCI command
192 // ("position"), and is ready to read the second token ("startpos"
193 // or "fen", if the input is well-formed).
195 void set_position(UCIInputParser &uip) {
199 uip >> token; // operator >> skips any whitespace
201 if (token == "startpos")
202 RootPosition.from_fen(StartPosition);
203 else if (token == "fen")
206 while (token != "moves" && !uip.eof())
212 RootPosition.from_fen(fen);
217 if (token != "moves")
219 if (token == "moves")
226 move = move_from_string(RootPosition, token);
227 RootPosition.do_move(move, st);
228 if (RootPosition.rule_50_counter() == 0)
229 RootPosition.reset_game_ply();
231 // Our StateInfo st is about going out of scope,
232 // so save its content before they disappear.
233 RootPosition.setStartState(st);
239 // set_option() is called when Stockfish receives the "setoption" UCI
240 // command. The input parameter is a UCIInputParser. It is assumed
241 // that this parser has consumed the first token of the UCI command
242 // ("setoption"), and is ready to read the second token ("name", if
243 // the input is well-formed).
245 void set_option(UCIInputParser &uip) {
247 std::string token, name;
256 if (token == "value")
259 name += (" " + token);
261 if (token == "value")
263 std::getline(uip, token); // reads until end of line
264 set_option_value(name, token);
271 // go() is called when Stockfish receives the "go" UCI command. The
272 // input parameter is a UCIInputParser. It is assumed that this
273 // parser has consumed the first token of the UCI command ("go"),
274 // and is ready to read the second token. The function sets the
275 // thinking time and other parameters from the input string, and
276 // calls think() (defined in search.cpp) with the appropriate
279 void go(UCIInputParser &uip) {
283 int time[2] = {0, 0}, inc[2] = {0, 0};
284 int movesToGo = 0, depth = 0, nodes = 0, moveTime = 0;
285 bool infinite = false, ponder = false;
286 Move searchMoves[500];
288 searchMoves[0] = MOVE_NONE;
294 if (token == "infinite")
296 else if (token == "ponder")
298 else if (token == "wtime")
300 else if (token == "btime")
302 else if (token == "winc")
304 else if (token == "binc")
306 else if (token == "movestogo")
308 else if (token == "depth")
310 else if (token == "nodes")
312 else if (token == "movetime")
314 else if (token == "searchmoves")
320 searchMoves[numOfMoves++] = move_from_string(RootPosition, token);
322 searchMoves[numOfMoves] = MOVE_NONE;
327 infinite = true; // HACK
329 assert(RootPosition.is_ok());
331 think(RootPosition, infinite, ponder, RootPosition.side_to_move(), time,
332 inc, movesToGo, depth, nodes, moveTime, searchMoves);