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uci.cpp
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uci.cpp
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/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Stockfish is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <iostream>
#include <sstream>
#include <string>
#include "evaluate.h"
#include "position.h"
#include "search.h"
#include "thread.h"
#include "tt.h"
#include "ucioption.h"
using namespace std;
extern void benchmark(const Position& pos, istream& is);
namespace {
// FEN string of the initial position, normal chess
const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
// Keep track of position keys along the setup moves (from start position to the
// position just before to start searching). This is needed by draw detection
// where, due to 50 moves rule, we need to check at most 100 plies back.
StateInfo StateRingBuf[102], *SetupState = StateRingBuf;
void set_option(istringstream& up);
void set_position(Position& pos, istringstream& up);
void go(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 cmd, token;
while (token != "quit")
{
if (!args.empty())
cmd = args;
else if (!getline(cin, cmd)) // Block here waiting for input
cmd = "quit";
istringstream is(cmd);
is >> skipws >> token;
if (token == "quit" || token == "stop")
{
Search::Signals.stop = true;
Threads.wait_for_search_finished(); // Cannot quit while threads are running
}
else if (token == "ponderhit")
{
// The opponent has played the expected move. GUI sends "ponderhit" if
// we were told to ponder on the same move the opponent has played. We
// should continue searching but switching from pondering to normal search.
Search::Limits.ponder = false;
if (Search::Signals.stopOnPonderhit)
{
Search::Signals.stop = true;
Threads.main_thread()->wake_up(); // Could be sleeping
}
}
else if (token == "go")
go(pos, is);
else if (token == "ucinewgame")
TT.clear();
else if (token == "isready")
cout << "readyok" << endl;
else if (token == "position")
set_position(pos, is);
else if (token == "setoption")
set_option(is);
else if (token == "d")
pos.print();
else if (token == "flip")
pos.flip();
else if (token == "eval")
cout << Eval::trace(pos) << endl;
else if (token == "bench")
benchmark(pos, is);
else if (token == "key")
cout << "key: " << hex << pos.key()
<< "\nmaterial key: " << pos.material_key()
<< "\npawn key: " << pos.pawn_key() << endl;
else if (token == "uci")
cout << "id name " << engine_info(true)
<< "\n" << Options
<< "\nuciok" << endl;
else if (token == "perft" && (is >> token)) // Read depth
{
stringstream ss;
ss << Options["Hash"] << " "
<< Options["Threads"] << " " << token << " current perft";
benchmark(pos, ss);
}
else
cout << "Unknown command: " << cmd << endl;
if (!args.empty()) // Command line arguments have one-shot behaviour
{
Threads.wait_for_search_finished();
break;
}
}
}
namespace {
// set_position() is called when engine receives the "position" UCI
// command. The function sets up the position described in the given
// fen string ("fen") or the starting position ("startpos") and then
// makes the moves given in the following move list ("moves").
void set_position(Position& pos, istringstream& is) {
Move m;
string token, fen;
is >> token;
if (token == "startpos")
{
fen = StartFEN;
is >> token; // Consume "moves" token if any
}
else if (token == "fen")
while (is >> token && token != "moves")
fen += token + " ";
else
return;
pos.from_fen(fen, Options["UCI_Chess960"], Threads.main_thread());
// Parse move list (if any)
while (is >> token && (m = move_from_uci(pos, token)) != MOVE_NONE)
{
pos.do_move(m, *SetupState);
// Increment pointer to StateRingBuf circular buffer
if (++SetupState - StateRingBuf >= 102)
SetupState = StateRingBuf;
}
}
// set_option() is called when engine receives the "setoption" UCI command. The
// function updates the UCI option ("name") to the given value ("value").
void set_option(istringstream& is) {
string token, name, value;
is >> token; // Consume "name" token
// Read option name (can contain spaces)
while (is >> token && token != "value")
name += string(" ", !name.empty()) + token;
// Read option value (can contain spaces)
while (is >> token)
value += string(" ", !value.empty()) + token;
if (Options.count(name))
Options[name] = value;
else
cout << "No such option: " << name << endl;
}
// go() is called when engine receives the "go" UCI command. The function sets
// the thinking time and other parameters from the input string, and then starts
// the search.
void go(Position& pos, istringstream& is) {
Search::LimitsType limits;
vector<Move> searchMoves;
string token;
while (is >> token)
{
if (token == "wtime")
is >> limits.time[WHITE];
else if (token == "btime")
is >> limits.time[BLACK];
else if (token == "winc")
is >> limits.inc[WHITE];
else if (token == "binc")
is >> limits.inc[BLACK];
else if (token == "movestogo")
is >> limits.movestogo;
else if (token == "depth")
is >> limits.depth;
else if (token == "nodes")
is >> limits.nodes;
else if (token == "movetime")
is >> limits.movetime;
else if (token == "infinite")
limits.infinite = true;
else if (token == "ponder")
limits.ponder = true;
else if (token == "searchmoves")
while (is >> token)
searchMoves.push_back(move_from_uci(pos, token));
}
Threads.start_searching(pos, limits, searchMoves);
}
}