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96 lines
2.8 KiB
C++
96 lines
2.8 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) 2008-2014 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 <sstream>
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#include "movegen.h"
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#include "notation.h"
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#include "position.h"
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using namespace std;
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static const char* PieceToChar[COLOR_NB] = { " PNBRQK", " pnbrqk" };
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/// score_to_uci() converts a value to a string suitable for use with the UCI
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/// protocol specifications:
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///
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/// cp <x> The score from the engine's point of view in centipawns.
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/// mate <y> Mate in y moves, not plies. If the engine is getting mated
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/// use negative values for y.
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string score_to_uci(Value v, Value alpha, Value beta) {
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stringstream ss;
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if (abs(v) < VALUE_MATE - MAX_PLY)
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ss << "cp " << v * 100 / PawnValueEg;
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else
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ss << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2;
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ss << (v >= beta ? " lowerbound" : v <= alpha ? " upperbound" : "");
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return ss.str();
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}
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/// move_to_uci() converts a move to a string in coordinate notation
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/// (g1f3, a7a8q, etc.). The only special case is castling moves, where we print
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/// in the e1g1 notation in normal chess mode, and in e1h1 notation in chess960
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/// mode. Internally castling moves are always encoded as "king captures rook".
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const string move_to_uci(Move m, bool chess960) {
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Square from = from_sq(m);
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Square to = to_sq(m);
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if (m == MOVE_NONE)
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return "(none)";
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if (m == MOVE_NULL)
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return "0000";
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if (type_of(m) == CASTLING && !chess960)
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to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
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string move = to_string(from) + to_string(to);
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if (type_of(m) == PROMOTION)
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move += PieceToChar[BLACK][promotion_type(m)]; // Lower case
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return move;
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}
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/// move_from_uci() takes a position and a string representing a move in
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/// simple coordinate notation and returns an equivalent legal Move if any.
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Move move_from_uci(const Position& pos, string& str) {
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if (str.length() == 5) // Junior could send promotion piece in uppercase
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str[4] = char(tolower(str[4]));
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for (MoveList<LEGAL> it(pos); *it; ++it)
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if (str == move_to_uci(*it, pos.is_chess960()))
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return *it;
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return MOVE_NONE;
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}
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