/*
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
+ Copyright (C) 2008-2014 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
*/
#include <cassert>
-#include <string>
+#include <sstream>
#include "movegen.h"
#include "position.h"
+#include "uci.h"
-using std::string;
+using namespace std;
-static const char* PieceToChar = " PNBRQK pnbrqk";
+static const char* PieceToChar[COLOR_NB] = { " PNBRQK", " pnbrqk" };
-/// move_to_uci() converts a move to a string in coordinate notation
+
+/// score_to_uci() converts a Value to a string suitable for use with the UCI
+/// protocol specifications:
+///
+/// cp <x> The score from the engine's point of view in centipawns.
+/// mate <y> Mate in y moves, not plies. If the engine is getting mated
+/// use negative values for y.
+
+string UCI::format_value(Value v, Value alpha, Value beta) {
+
+ stringstream ss;
+
+ if (abs(v) < VALUE_MATE_IN_MAX_PLY)
+ ss << "cp " << v * 100 / PawnValueEg;
+ else
+ ss << "mate " << (v > 0 ? VALUE_MATE - v + 1 : -VALUE_MATE - v) / 2;
+
+ ss << (v >= beta ? " lowerbound" : v <= alpha ? " upperbound" : "");
+
+ return ss.str();
+}
+
+
+/// format_square() converts a Square to a string (g1, a7, etc.)
+
+std::string UCI::format_square(Square s) {
+ char ch[] = { 'a' + file_of(s), '1' + rank_of(s), 0 };
+ return ch;
+}
+
+
+/// format_move() converts a Move to a string in coordinate notation
/// (g1f3, a7a8q, etc.). The only special case is castling moves, where we print
/// in the e1g1 notation in normal chess mode, and in e1h1 notation in chess960
-/// mode. Internally castle moves are always coded as "king captures rook".
+/// mode. Internally castling moves are always encoded as "king captures rook".
-const string move_to_uci(Move m, bool chess960) {
+string UCI::format_move(Move m, bool chess960) {
Square from = from_sq(m);
Square to = to_sq(m);
if (m == MOVE_NULL)
return "0000";
- if (type_of(m) == CASTLE && !chess960)
- to = (to > from ? FILE_G : FILE_C) | rank_of(from);
+ if (type_of(m) == CASTLING && !chess960)
+ to = make_square(to > from ? FILE_G : FILE_C, rank_of(from));
- string move = square_to_string(from) + square_to_string(to);
+ string move = format_square(from) + format_square(to);
if (type_of(m) == PROMOTION)
- move += PieceToChar[promotion_type(m) + 7]; // Lower case
+ move += PieceToChar[BLACK][promotion_type(m)]; // Lower case
return move;
}
-/// move_from_uci() takes a position and a string representing a move in
+/// to_move() takes a position and a string representing a move in
/// simple coordinate notation and returns an equivalent legal Move if any.
-Move move_from_uci(const Position& pos, string& str) {
+Move UCI::to_move(const Position& pos, string& str) {
if (str.length() == 5) // Junior could send promotion piece in uppercase
str[4] = char(tolower(str[4]));
- for (MoveList<LEGAL> ml(pos); !ml.end(); ++ml)
- if (str == move_to_uci(ml.move(), pos.is_chess960()))
- return ml.move();
+ for (MoveList<LEGAL> it(pos); *it; ++it)
+ if (str == format_move(*it, pos.is_chess960()))
+ return *it;
return MOVE_NONE;
}
-
-
-/// move_to_san() takes a position and a legal Move as input and returns its
-/// short algebraic notation representation.
-
-const string move_to_san(Position& pos, Move m) {
-
- if (m == MOVE_NONE)
- return "(none)";
-
- if (m == MOVE_NULL)
- return "(null)";
-
- assert(pos.move_is_legal(m));
-
- Bitboard attackers;
- bool ambiguousMove, ambiguousFile, ambiguousRank;
- string san;
- Color us = pos.side_to_move();
- Square from = from_sq(m);
- Square to = to_sq(m);
- Piece pc = pos.piece_on(from);
-
- if (type_of(m) == CASTLE)
- san = to > from ? "O-O" : "O-O-O";
- else
- {
- if (type_of(pc) != PAWN)
- {
- san = PieceToChar[pc];
-
- // Disambiguation if we have more then one piece with destination 'to'
- // note that for pawns is not needed because starting file is explicit.
- ambiguousMove = ambiguousFile = ambiguousRank = false;
-
- attackers = (pos.attacks_from(pc, to) & pos.pieces(us)) ^ from;
-
- while (attackers)
- {
- Square sq = pop_1st_bit(&attackers);
-
- // Pinned pieces are not included in the possible sub-set
- if (!pos.pl_move_is_legal(make_move(sq, to), pos.pinned_pieces()))
- continue;
-
- ambiguousFile |= file_of(sq) == file_of(from);
- ambiguousRank |= rank_of(sq) == rank_of(from);
- ambiguousMove = true;
- }
-
- if (ambiguousMove)
- {
- if (!ambiguousFile)
- san += file_to_char(file_of(from));
-
- else if (!ambiguousRank)
- san += rank_to_char(rank_of(from));
-
- else
- san += square_to_string(from);
- }
- }
- else if (pos.is_capture(m))
- san = file_to_char(file_of(from));
-
- if (pos.is_capture(m))
- san += 'x';
-
- san += square_to_string(to);
-
- if (type_of(m) == PROMOTION)
- san += string("=") + PieceToChar[promotion_type(m)];
- }
-
- if (pos.move_gives_check(m, CheckInfo(pos)))
- {
- StateInfo st;
- pos.do_move(m, st);
- san += MoveList<LEGAL>(pos).size() ? "+" : "#";
- pos.undo_move(m);
- }
-
- return san;
-}
projects / stockfish / blobdiff