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
127 else if (token == "uci")
129 std::cout << "id name " << engine_name() << std::endl
130 << "id author Tord Romstad, Marco Costalba"
133 std::cout << "uciok" << std::endl;
135 else if (token == "ucinewgame")
138 Position::init_piece_square_tables();
139 RootPosition.from_fen(StartPosition);
141 else if (token == "isready")
142 std::cout << "readyok" << std::endl;
143 else if (token == "position")
145 else if (token == "setoption")
147 else if (token == "go")
150 // The remaining commands are for debugging purposes only.
151 // Perhaps they should be removed later in order to reduce the
152 // size of the program binary.
153 else if (token == "d")
154 RootPosition.print();
155 else if (token == "flip")
157 Position p(RootPosition);
158 RootPosition.flipped_copy(p);
160 else if (token == "eval")
163 std::cout << "Incremental mg: " << RootPosition.mg_value()
165 std::cout << "Incremental eg: " << RootPosition.eg_value()
167 std::cout << "Full eval: "
168 << evaluate(RootPosition, ei, 0)
171 else if (token == "key")
173 std::cout << "key: " << RootPosition.get_key()
174 << " material key: " << RootPosition.get_material_key()
175 << " pawn key: " << RootPosition.get_pawn_key()
180 std::cout << "Unknown command: " << command << std::endl;
184 std::cout << token << std::endl;
190 // set_position() is called when Stockfish receives the "position" UCI
191 // command. The input parameter is a UCIInputParser. It is assumed
192 // that this parser has consumed the first token of the UCI command
193 // ("position"), and is ready to read the second token ("startpos"
194 // or "fen", if the input is well-formed).
196 void set_position(UCIInputParser &uip) {
200 uip >> token; // operator >> skips any whitespace
202 if (token == "startpos")
203 RootPosition.from_fen(StartPosition);
204 else if (token == "fen")
207 while (token != "moves" && !uip.eof())
213 RootPosition.from_fen(fen);
218 if (token != "moves")
220 if (token == "moves")
227 move = move_from_string(RootPosition, token);
228 RootPosition.do_move(move, st);
229 if (RootPosition.rule_50_counter() == 0)
230 RootPosition.reset_game_ply();
232 // Our StateInfo st is about going out of scope,
233 // so save its content before they disappear.
234 RootPosition.setStartState(st);
240 // set_option() is called when Stockfish receives the "setoption" UCI
241 // command. The input parameter is a UCIInputParser. It is assumed
242 // that this parser has consumed the first token of the UCI command
243 // ("setoption"), and is ready to read the second token ("name", if
244 // the input is well-formed).
246 void set_option(UCIInputParser &uip) {
248 std::string token, name;
255 while (!uip.eof() && token != "value")
257 name += (" " + token);
260 if (token == "value")
262 std::getline(uip, token); // reads until end of line
263 set_option_value(name, token);
270 // go() is called when Stockfish receives the "go" UCI command. The
271 // input parameter is a UCIInputParser. It is assumed that this
272 // parser has consumed the first token of the UCI command ("go"),
273 // and is ready to read the second token. The function sets the
274 // thinking time and other parameters from the input string, and
275 // calls think() (defined in search.cpp) with the appropriate
278 void go(UCIInputParser &uip) {
282 int time[2] = {0, 0}, inc[2] = {0, 0};
283 int movesToGo = 0, depth = 0, nodes = 0, moveTime = 0;
284 bool infinite = false, ponder = false;
285 Move searchMoves[500];
287 searchMoves[0] = MOVE_NONE;
293 if (token == "infinite")
295 else if (token == "ponder")
297 else if (token == "wtime")
299 else if (token == "btime")
301 else if (token == "winc")
303 else if (token == "binc")
305 else if (token == "movestogo")
307 else if (token == "depth")
309 else if (token == "nodes")
311 else if (token == "movetime")
313 else if (token == "searchmoves")
319 searchMoves[numOfMoves++] = move_from_string(RootPosition, token);
321 searchMoves[numOfMoves] = MOVE_NONE;
326 infinite = true; // HACK
328 assert(RootPosition.is_ok());
330 think(RootPosition, infinite, ponder, RootPosition.side_to_move(), time,
331 inc, movesToGo, depth, nodes, moveTime, searchMoves);