////
#include <cassert>
+#include <cctype>
#include <iostream>
#include <sstream>
#include <string>
-#include "book.h"
#include "evaluate.h"
#include "misc.h"
#include "move.h"
#include "position.h"
#include "san.h"
#include "search.h"
-#include "uci.h"
#include "ucioption.h"
using namespace std;
-////
-//// Local definitions:
-////
namespace {
// FEN string for the initial position
const string StartPositionFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
- // UCIInputParser is a class for parsing UCI input. The class
+ // UCIParser is a class for parsing UCI input. The class
// is actually a string stream built on a given input string.
- typedef istringstream UCIInputParser;
+ typedef istringstream UCIParser;
// Local functions
- bool handle_command(Position& pos, const string& command);
- void set_option(UCIInputParser& uip);
- void set_position(Position& pos, UCIInputParser& uip);
- bool go(Position& pos, UCIInputParser& uip);
- void perft(Position& pos, UCIInputParser& uip);
+ void set_option(UCIParser& up);
+ void set_position(Position& pos, UCIParser& up);
+ bool go(Position& pos, UCIParser& up);
+ void perft(Position& pos, UCIParser& up);
+ Move parse_uci_move(const Position& pos, const std::string &str);
}
-////
-//// Functions
-////
+/// execute_uci_command() takes a string as input, uses a UCIParser
+/// object to parse this text string as a UCI command, and calls
+/// the appropriate functions. In addition to the UCI commands,
+/// the function also supports a few debug commands.
+
+bool execute_uci_command(const string& cmd) {
+
+ static Position pos(StartPositionFEN, false, 0); // The root position
+ UCIParser up(cmd);
+ string token;
+
+ if (!(up >> token)) // operator>>() skips any whitespace
+ return true;
+
+ if (token == "quit")
+ return false;
+
+ if (token == "go")
+ return go(pos, up);
+
+ if (token == "uci")
+ {
+ cout << "id name " << engine_name()
+ << "\nid author Tord Romstad, Marco Costalba, Joona Kiiski\n";
+ print_uci_options();
+ cout << "uciok" << endl;
+ }
+ else if (token == "ucinewgame")
+ pos.from_fen(StartPositionFEN, false);
-/// uci_main_loop() is the only global function in this file. It is
-/// called immediately after the program has finished initializing.
-/// The program remains in this loop until it receives the "quit" UCI
-/// command. It waits for a command from the user, and passes this
-/// command to handle_command and also intercepts EOF from stdin,
-/// by translating EOF to the "quit" command. This ensures that Stockfish
-/// exits gracefully if the GUI dies unexpectedly.
+ else if (token == "isready")
+ cout << "readyok" << endl;
-void uci_main_loop() {
+ else if (token == "position")
+ set_position(pos, up);
- Position pos(StartPositionFEN, 0); // The root position
- string command;
+ else if (token == "setoption")
+ set_option(up);
- do {
- // Wait for a command from stdin
- if (!getline(cin, command))
- command = "quit";
+ // The remaining commands are for debugging purposes only
+ else if (token == "d")
+ pos.print();
- } while (handle_command(pos, command));
+ else if (token == "flip")
+ {
+ Position p(pos, pos.thread());
+ pos.flipped_copy(p);
+ }
+ else if (token == "eval")
+ {
+ Value evalMargin;
+ cout << "Incremental mg: " << mg_value(pos.value())
+ << "\nIncremental eg: " << eg_value(pos.value())
+ << "\nFull eval: " << evaluate(pos, evalMargin) << endl;
+ }
+ else if (token == "key")
+ cout << "key: " << hex << pos.get_key()
+ << "\nmaterial key: " << pos.get_material_key()
+ << "\npawn key: " << pos.get_pawn_key() << endl;
+
+ else if (token == "perft")
+ perft(pos, up);
+
+ else
+ cout << "Unknown command: " << cmd << endl;
+
+ return true;
}
namespace {
- // handle_command() takes a text string as input, uses a
- // UCIInputParser object to parse this text string as a UCI command,
- // and calls the appropriate functions. In addition to the UCI
- // commands, the function also supports a few debug commands.
+ // parse_uci_move() takes a position and a string as input, and attempts to
+ // convert the string to a move, using simple coordinate notation (g1f3,
+ // a7a8q, etc.). In order to correctly parse en passant captures and castling
+ // moves, we need the position. This function is not robust, and expects that
+ // the input move is legal and correctly formatted.
- bool handle_command(Position& pos, const string& command) {
+ Move parse_uci_move(const Position& pos, const std::string& str) {
- UCIInputParser uip(command);
- string token;
+ Square from, to;
+ Piece piece;
+ Color us = pos.side_to_move();
- if (!(uip >> token)) // operator>>() skips any whitespace
- return true;
+ if (str.length() < 4)
+ return MOVE_NONE;
- if (token == "quit")
- return false;
+ // Read the from and to squares
+ from = make_square(file_from_char(str[0]), rank_from_char(str[1]));
+ to = make_square(file_from_char(str[2]), rank_from_char(str[3]));
- if (token == "go")
- return go(pos, uip);
+ // Find the moving piece
+ piece = pos.piece_on(from);
- if (token == "uci")
- {
- cout << "id name " << engine_name()
- << "\nid author Tord Romstad, Marco Costalba, Joona Kiiski\n";
- print_uci_options();
- cout << "uciok" << endl;
- }
- else if (token == "ucinewgame")
- {
- Options["New Game"].set_value("true");
- pos.from_fen(StartPositionFEN);
- }
- else if (token == "isready")
- cout << "readyok" << endl;
- else if (token == "position")
- set_position(pos, uip);
- else if (token == "setoption")
- set_option(uip);
-
- // The remaining commands are for debugging purposes only.
- // Perhaps they should be removed later in order to reduce the
- // size of the program binary.
- else if (token == "d")
- pos.print();
- else if (token == "flip")
+ // If the string has more than 4 characters, try to interpret the 5th
+ // character as a promotion.
+ if (str.length() > 4 && piece == piece_of_color_and_type(us, PAWN))
{
- Position p(pos, pos.thread());
- pos.flipped_copy(p);
+ switch (tolower(str[4])) {
+ case 'n':
+ return make_promotion_move(from, to, KNIGHT);
+ case 'b':
+ return make_promotion_move(from, to, BISHOP);
+ case 'r':
+ return make_promotion_move(from, to, ROOK);
+ case 'q':
+ return make_promotion_move(from, to, QUEEN);
+ }
}
- else if (token == "eval")
+
+ // En passant move? We assume that a pawn move is an en passant move
+ // if the destination square is epSquare.
+ if (to == pos.ep_square() && piece == piece_of_color_and_type(us, PAWN))
+ return make_ep_move(from, to);
+
+ // Is this a castling move? A king move is assumed to be a castling move
+ // if the destination square is occupied by a friendly rook, or if the
+ // distance between the source and destination squares is more than 1.
+ if (piece == piece_of_color_and_type(us, KING))
{
- Value evalMargin;
- cout << "Incremental mg: " << mg_value(pos.value())
- << "\nIncremental eg: " << eg_value(pos.value())
- << "\nFull eval: " << evaluate(pos, evalMargin) << endl;
+ if (pos.piece_on(to) == piece_of_color_and_type(us, ROOK))
+ return make_castle_move(from, to);
+
+ if (square_distance(from, to) > 1)
+ {
+ // This is a castling move, but we have to translate it to the
+ // internal "king captures rook" representation.
+ SquareDelta delta = (to > from ? DELTA_E : DELTA_W);
+ Square s = from;
+
+ do s += delta;
+ while ( pos.piece_on(s) != piece_of_color_and_type(us, ROOK)
+ && relative_rank(us, s) == RANK_1);
+
+ return relative_rank(us, s) == RANK_1 ? make_castle_move(from, s) : MOVE_NONE;
+ }
}
- else if (token == "key")
- cout << "key: " << hex << pos.get_key()
- << "\nmaterial key: " << pos.get_material_key()
- << "\npawn key: " << pos.get_pawn_key() << endl;
- else if (token == "perft")
- perft(pos, uip);
- else
- cout << "Unknown command: " << command << endl;
-
- return true;
- }
+ return make_move(from, to);
+ }
// set_position() is called when Stockfish receives the "position" UCI
- // command. The input parameter is a UCIInputParser. It is assumed
+ // command. The input parameter is a UCIParser. It is assumed
// that this parser has consumed the first token of the UCI command
// ("position"), and is ready to read the second token ("startpos"
// or "fen", if the input is well-formed).
- void set_position(Position& pos, UCIInputParser& uip) {
+ void set_position(Position& pos, UCIParser& up) {
string token;
- if (!(uip >> token)) // operator>>() skips any whitespace
+ if (!(up >> token) || (token != "startpos" && token != "fen"))
return;
if (token == "startpos")
- pos.from_fen(StartPositionFEN);
- else if (token == "fen")
+ {
+ pos.from_fen(StartPositionFEN, false);
+ if (!(up >> token))
+ return;
+ }
+ else // fen
{
string fen;
- while (uip >> token && token != "moves")
+ while (up >> token && token != "moves")
{
fen += token;
fen += ' ';
}
- pos.from_fen(fen);
+ pos.from_fen(fen, Options["UCI_Chess960"].value<bool>());
}
- if (uip.good())
- {
- if (token != "moves")
- uip >> token;
+ if (token != "moves")
+ return;
- if (token == "moves")
- {
- Move move;
- StateInfo st;
- while (uip >> token)
- {
- move = move_from_string(pos, token);
- pos.do_move(move, st);
- if (pos.rule_50_counter() == 0)
- pos.reset_game_ply();
-
- pos.inc_startpos_ply_counter(); //FIXME: make from_fen to support this and rule50
- }
- // Our StateInfo st is about going out of scope so copy
- // its content inside pos before it disappears.
- pos.detach();
- }
+ // Parse optional move list
+ Move move;
+ StateInfo st;
+ while (up >> token)
+ {
+ move = parse_uci_move(pos, token);
+ pos.do_setup_move(move, st);
}
+ // Our StateInfo st is about going out of scope so copy
+ // its content inside pos before it disappears.
+ pos.detach();
}
// set_option() is called when Stockfish receives the "setoption" UCI
- // command. The input parameter is a UCIInputParser. It is assumed
+ // command. The input parameter is a UCIParser. It is assumed
// that this parser has consumed the first token of the UCI command
// ("setoption"), and is ready to read the second token ("name", if
// the input is well-formed).
- void set_option(UCIInputParser& uip) {
+ void set_option(UCIParser& up) {
string token, name, value;
- if (!(uip >> token)) // operator>>() skips any whitespace
+ if (!(up >> token) || token != "name") // operator>>() skips any whitespace
return;
- if (token != "name" || !(uip >> name))
+ if (!(up >> name))
return;
- while (uip >> token && token != "value")
+ // Handle names with included spaces
+ while (up >> token && token != "value")
name += (" " + token);
if (Options.find(name) == Options.end())
return;
}
- if (token != "value" || !(uip >> value))
+ // Is a button ?
+ if (token != "value")
{
Options[name].set_value("true");
return;
}
- while (uip >> token)
+ if (!(up >> value))
+ return;
+
+ // Handle values with included spaces
+ while (up >> token)
value += (" " + token);
Options[name].set_value(value);
// go() is called when Stockfish receives the "go" UCI command. The
- // input parameter is a UCIInputParser. It is assumed that this
+ // input parameter is a UCIParser. It is assumed that this
// parser has consumed the first token of the UCI command ("go"),
// and is ready to read the second token. The function sets the
// thinking time and other parameters from the input string, and
// parameters. Returns false if a quit command is received while
// thinking, returns true otherwise.
- bool go(Position& pos, UCIInputParser& uip) {
+ bool go(Position& pos, UCIParser& up) {
string token;
searchMoves[0] = MOVE_NONE;
- while (uip >> token)
+ while (up >> token)
{
if (token == "infinite")
infinite = true;
else if (token == "ponder")
ponder = true;
else if (token == "wtime")
- uip >> time[0];
+ up >> time[0];
else if (token == "btime")
- uip >> time[1];
+ up >> time[1];
else if (token == "winc")
- uip >> inc[0];
+ up >> inc[0];
else if (token == "binc")
- uip >> inc[1];
+ up >> inc[1];
else if (token == "movestogo")
- uip >> movesToGo;
+ up >> movesToGo;
else if (token == "depth")
- uip >> depth;
+ up >> depth;
else if (token == "nodes")
- uip >> nodes;
+ up >> nodes;
else if (token == "movetime")
- uip >> moveTime;
+ up >> moveTime;
else if (token == "searchmoves")
{
int numOfMoves = 0;
- while (uip >> token)
- searchMoves[numOfMoves++] = move_from_string(pos, token);
+ while (up >> token)
+ searchMoves[numOfMoves++] = parse_uci_move(pos, token);
searchMoves[numOfMoves] = MOVE_NONE;
}
depth, nodes, moveTime, searchMoves);
}
- void perft(Position& pos, UCIInputParser& uip) {
+ void perft(Position& pos, UCIParser& up) {
- string token;
- int depth, tm, n;
+ int depth, tm;
+ int64_t n;
- if (!(uip >> depth))
+ if (!(up >> depth))
return;
tm = get_system_time();
projects / stockfish / blobdiff