mirror of
https://github.com/peterosterlund2/droidfish.git
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248 lines
6.7 KiB
C++
248 lines
6.7 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <cassert>
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#include <iostream>
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#include <sstream>
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#include <string>
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#include "evaluate.h"
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#include "misc.h"
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#include "move.h"
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#include "position.h"
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#include "search.h"
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#include "ucioption.h"
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using namespace std;
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namespace {
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// FEN string for the initial position
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const string StartPositionFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
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// UCIParser is a class for parsing UCI input. The class
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// is actually a string stream built on a given input string.
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typedef istringstream UCIParser;
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void set_option(UCIParser& up);
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void set_position(Position& pos, UCIParser& up);
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bool go(Position& pos, UCIParser& up);
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void perft(Position& pos, UCIParser& up);
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}
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/// execute_uci_command() takes a string as input, uses a UCIParser
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/// object to parse this text string as a UCI command, and calls
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/// the appropriate functions. In addition to the UCI commands,
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/// the function also supports a few debug commands.
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bool execute_uci_command(const string& cmd) {
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static Position pos(StartPositionFEN, false, 0); // The root position
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UCIParser up(cmd);
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string token;
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up >> token; // operator>>() skips any whitespace
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if (token == "quit")
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return false;
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if (token == "go")
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return go(pos, up);
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if (token == "ucinewgame")
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pos.from_fen(StartPositionFEN, false);
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else if (token == "isready")
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cout << "readyok" << endl;
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else if (token == "position")
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set_position(pos, up);
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else if (token == "setoption")
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set_option(up);
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else if (token == "perft")
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perft(pos, up);
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else if (token == "d")
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pos.print();
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else if (token == "flip")
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pos.flip();
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else if (token == "eval")
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{
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read_evaluation_uci_options(pos.side_to_move());
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cout << trace_evaluate(pos) << endl;
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}
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else if (token == "key")
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cout << "key: " << hex << pos.get_key()
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<< "\nmaterial key: " << pos.get_material_key()
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<< "\npawn key: " << pos.get_pawn_key() << endl;
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else if (token == "uci")
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cout << "id name " << engine_name()
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<< "\nid author " << engine_authors()
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<< "\n" << Options.print_all()
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<< "\nuciok" << endl;
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else
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cout << "Unknown command: " << cmd << endl;
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return true;
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}
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namespace {
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// set_position() is called when engine receives the "position" UCI
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// command. The function sets up the position described in the given
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// fen string ("fen") or the starting position ("startpos") and then
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// makes the moves given in the following move list ("moves").
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void set_position(Position& pos, UCIParser& up) {
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string token, fen;
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up >> token; // operator>>() skips any whitespace
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if (token == "startpos")
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{
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pos.from_fen(StartPositionFEN, false);
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up >> token; // Consume "moves" token if any
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}
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else if (token == "fen")
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{
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while (up >> token && token != "moves")
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fen += token + " ";
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pos.from_fen(fen, Options["UCI_Chess960"].value<bool>());
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}
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else return;
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// Parse move list (if any)
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while (up >> token)
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pos.do_setup_move(move_from_uci(pos, token));
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}
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// set_option() is called when engine receives the "setoption" UCI
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// command. The function updates the corresponding UCI option ("name")
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// to the given value ("value").
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void set_option(UCIParser& up) {
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string token, name;
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string value = "true"; // UCI buttons don't have a "value" field
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up >> token; // Consume "name" token
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up >> name; // Read option name
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// Handle names with included spaces
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while (up >> token && token != "value")
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name += " " + token;
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up >> value; // Read option value
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// Handle values with included spaces
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while (up >> token)
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value += " " + token;
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if (Options.find(name) != Options.end())
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Options[name].set_value(value);
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else
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cout << "No such option: " << name << endl;
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}
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// go() is called when engine receives the "go" UCI command. The
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// function sets the thinking time and other parameters from the input
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// string, and then calls think(). Returns false if a quit command
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// is received while thinking, true otherwise.
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bool go(Position& pos, UCIParser& up) {
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string token;
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SearchLimits limits;
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Move searchMoves[MAX_MOVES], *cur = searchMoves;
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int time[] = { 0, 0 }, inc[] = { 0, 0 };
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while (up >> token)
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{
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if (token == "infinite")
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limits.infinite = true;
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else if (token == "ponder")
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limits.ponder = true;
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else if (token == "wtime")
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up >> time[WHITE];
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else if (token == "btime")
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up >> time[BLACK];
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else if (token == "winc")
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up >> inc[WHITE];
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else if (token == "binc")
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up >> inc[BLACK];
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else if (token == "movestogo")
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up >> limits.movesToGo;
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else if (token == "depth")
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up >> limits.maxDepth;
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else if (token == "nodes")
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up >> limits.maxNodes;
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else if (token == "movetime")
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up >> limits.maxTime;
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else if (token == "searchmoves")
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while (up >> token)
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*cur++ = move_from_uci(pos, token);
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}
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*cur = MOVE_NONE;
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limits.time = time[pos.side_to_move()];
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limits.increment = inc[pos.side_to_move()];
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assert(pos.is_ok());
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return think(pos, limits, searchMoves);
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}
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// perft() is called when engine receives the "perft" command.
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// The function calls perft() passing the required search depth
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// then prints counted leaf nodes and elapsed time.
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void perft(Position& pos, UCIParser& up) {
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int depth, time;
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int64_t n;
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if (!(up >> depth))
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return;
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time = get_system_time();
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n = perft(pos, depth * ONE_PLY);
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time = get_system_time() - time;
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std::cout << "\nNodes " << n
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<< "\nTime (ms) " << time
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<< "\nNodes/second " << int(n / (time / 1000.0)) << std::endl;
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}
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}
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