Rename move.cpp to notation.cpp

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/notation.cpp

@@ -0,0 +1,154 @@
+/*
+  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 <cassert>
+#include <string>
+
+#include "movegen.h"
+#include "position.h"
+
+using std::string;
+
+/// move_to_uci() 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".
+
+const string move_to_uci(Move m, bool chess960) {
+
+  Square from = from_sq(m);
+  Square to = to_sq(m);
+  string promotion;
+
+  if (m == MOVE_NONE)
+      return "(none)";
+
+  if (m == MOVE_NULL)
+      return "0000";
+
+  if (is_castle(m) && !chess960)
+      to = (to > from ? FILE_G : FILE_C) | rank_of(from);
+
+  if (is_promotion(m))
+      promotion = char(tolower(piece_type_to_char(promotion_type(m))));
+
+  return square_to_string(from) + square_to_string(to) + promotion;
+}
+
+
+/// move_from_uci() 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) {
+
+  if (str.length() == 5) // Junior could send promotion piece in uppercase
+      str[4] = char(tolower(str[4]));
+
+  for (MoveList<MV_LEGAL> ml(pos); !ml.end(); ++ml)
+      if (str == move_to_uci(ml.move(), pos.is_chess960()))
+          return ml.move();
+
+  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;
+  Square from = from_sq(m);
+  Square to = to_sq(m);
+  PieceType pt = type_of(pos.piece_on(from));
+
+  if (is_castle(m))
+      san = to > from ? "O-O" : "O-O-O";
+  else
+  {
+      if (pt != PAWN)
+      {
+          san = piece_type_to_char(pt);
+
+          // Disambiguation if we have more then one piece with destination 'to'
+          // note that for pawns is not needed because starting file is explicit.
+          attackers = pos.attackers_to(to) & pos.pieces(pos.side_to_move(), pt);
+          attackers ^= from;
+          ambiguousMove = ambiguousFile = ambiguousRank = false;
+
+          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);
+          }
+      }
+
+      if (pos.is_capture(m))
+      {
+          if (pt == PAWN)
+              san += file_to_char(file_of(from));
+
+          san += 'x';
+      }
+
+      san += square_to_string(to);
+
+      if (is_promotion(m))
+          san += string("=") + piece_type_to_char(promotion_type(m));
+  }
+
+  if (pos.move_gives_check(m, CheckInfo(pos)))
+  {
+      StateInfo st;
+      pos.do_move(m, st);
+      san += MoveList<MV_LEGAL>(pos).size() ? "+" : "#";
+      pos.undo_move(m);
+  }
+
+  return san;
+}