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Retire move.cpp
Move its functions where they belong. No functional change. Signed-off-by: Marco Costalba <mcostalba@gmail.com>
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Marco Costalba
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src/move.cpp
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src/move.cpp
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/*
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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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////
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//// Includes
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////
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#include <cassert>
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#include <cctype>
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#include "move.h"
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#include "piece.h"
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#include "position.h"
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////
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//// Functions
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////
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/// move_from_uci() takes a position and a string as input, and attempts to
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/// convert the string to a move, using simple coordinate notation (g1f3,
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/// a7a8q, etc.). In order to correctly parse en passant captures and castling
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/// moves, we need the position. This function is not robust, and expects that
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/// the input move is legal and correctly formatted.
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Move move_from_uci(const Position& pos, const std::string& str) {
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Square from, to;
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Piece piece;
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Color us = pos.side_to_move();
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if (str.length() < 4)
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return MOVE_NONE;
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// Read the from and to squares
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from = make_square(file_from_char(str[0]), rank_from_char(str[1]));
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to = make_square(file_from_char(str[2]), rank_from_char(str[3]));
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// Find the moving piece
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piece = pos.piece_on(from);
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// If the string has more than 4 characters, try to interpret the 5th
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// character as a promotion.
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if (str.length() > 4 && piece == piece_of_color_and_type(us, PAWN))
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{
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switch (tolower(str[4])) {
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case 'n':
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return make_promotion_move(from, to, KNIGHT);
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case 'b':
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return make_promotion_move(from, to, BISHOP);
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case 'r':
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return make_promotion_move(from, to, ROOK);
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case 'q':
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return make_promotion_move(from, to, QUEEN);
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}
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}
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// En passant move? We assume that a pawn move is an en passant move
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// if the destination square is epSquare.
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if (to == pos.ep_square() && piece == piece_of_color_and_type(us, PAWN))
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return make_ep_move(from, to);
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// Is this a castling move? A king move is assumed to be a castling move
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// if the destination square is occupied by a friendly rook, or if the
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// distance between the source and destination squares is more than 1.
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if (piece == piece_of_color_and_type(us, KING))
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{
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if (pos.piece_on(to) == piece_of_color_and_type(us, ROOK))
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return make_castle_move(from, to);
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if (square_distance(from, to) > 1)
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{
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// This is a castling move, but we have to translate it to the
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// internal "king captures rook" representation.
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SquareDelta delta = (to > from ? DELTA_E : DELTA_W);
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Square s = from;
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do s += delta;
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while ( pos.piece_on(s) != piece_of_color_and_type(us, ROOK)
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&& relative_rank(us, s) == RANK_1);
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return relative_rank(us, s) == RANK_1 ? make_castle_move(from, s) : MOVE_NONE;
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}
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}
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return make_move(from, to);
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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
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/// print in the e1g1 notation in normal chess mode, and in e1h1 notation in
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/// Chess960 mode.
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const std::string move_to_uci(Move move, bool chess960) {
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std::string str;
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Square from = move_from(move);
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Square to = move_to(move);
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if (move == MOVE_NONE)
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str = "(none)";
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else if (move == MOVE_NULL)
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str = "0000";
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else
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{
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if (move_is_short_castle(move) && !chess960)
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return (from == SQ_E1 ? "e1g1" : "e8g8");
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if (move_is_long_castle(move) && !chess960)
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return (from == SQ_E1 ? "e1c1" : "e8c8");
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str = square_to_string(from) + square_to_string(to);
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if (move_is_promotion(move))
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str += char(tolower(piece_type_to_char(move_promotion_piece(move))));
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}
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return str;
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}
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/// Overload the << operator, to make it easier to print moves
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std::ostream& operator << (std::ostream& os, Move m) {
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bool chess960 = (os.iword(0) != 0); // See set960()
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return os << move_to_uci(m, chess960);
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}
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/// move_is_ok(), for debugging
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bool move_is_ok(Move m) {
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return move_from(m) != move_to(m); // Catches also MOVE_NONE
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}
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