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Retire move_from_san()

Browse source 
It is unused and it is big.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2011-01-08 16:23:46 +01:00
parent 6b49d509a1
commit c82906a2c3
2 changed files with 0 additions and 161 deletions
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160
src/san.cpp
View file

@ -174,166 +174,6 @@ const string move_to_san(Position& pos, Move m) {
}
/// move_from_san() takes a position and a string as input, and tries to
/// interpret the string as a move in short algebraic notation. On success,
/// the move is returned. On failure (i.e. if the string is unparsable, or
/// if the move is illegal or ambiguous), MOVE_NONE is returned.
Move move_from_san(const Position& pos, const string& movestr) {
assert(pos.is_ok());
enum { START, TO_FILE, TO_RANK, PROMOTION_OR_CHECK, PROMOTION, CHECK, END };
static const string pieceLetters = "KQRBN";
MoveStack mlist[MOVES_MAX], *last;
PieceType pt = PIECE_TYPE_NONE, promotion = PIECE_TYPE_NONE;
File fromFile = FILE_NONE, toFile = FILE_NONE;
Rank fromRank = RANK_NONE, toRank = RANK_NONE;
Move move = MOVE_NONE;
Square from, to;
int matches, state = START;
// Generate all legal moves for the given position
last = generate<MV_LEGAL>(pos, mlist);
// Castling moves
if (movestr == "O-O-O" || movestr == "O-O-O+")
{
for (MoveStack* cur = mlist; cur != last; cur++)
if (move_is_long_castle(cur->move))
return cur->move;
return MOVE_NONE;
}
else if (movestr == "O-O" || movestr == "O-O+")
{
for (MoveStack* cur = mlist; cur != last; cur++)
if (move_is_short_castle(cur->move))
return cur->move;
return MOVE_NONE;
}
// Normal moves. We use a simple FSM to parse the san string
for (size_t i = 0; i < movestr.length(); i++)
{
char type, c = movestr[i];
if (pieceLetters.find(c) != string::npos)
type = 'P';
else if (c >= 'a' && c <= 'h')
type = 'F';
else if (c >= '1' && c <= '8')
type = 'R';
else
type = c;
switch (type) {
case 'P':
if (state == START)
{
pt = piece_type_from_char(c);
state = TO_FILE;
}
else if (state == PROMOTION)
{
promotion = piece_type_from_char(c);
state = (i < movestr.length() - 1 ? CHECK : END);
}
else
return MOVE_NONE;
break;
case 'F':
if (state == START)
{
pt = PAWN;
fromFile = toFile = file_from_char(c);
state = TO_RANK;
}
else if (state == TO_FILE)
{
toFile = file_from_char(c);
state = TO_RANK;
}
else if (state == TO_RANK && toFile != FILE_NONE)
{
// Previous file was for disambiguation
fromFile = toFile;
toFile = file_from_char(c);
}
else
return MOVE_NONE;
break;
case 'R':
if (state == TO_RANK)
{
toRank = rank_from_char(c);
state = (i < movestr.length() - 1) ? PROMOTION_OR_CHECK : END;
}
else if (state == TO_FILE && fromRank == RANK_NONE)
{
// It's a disambiguation rank instead of a file
fromRank = rank_from_char(c);
}
else
return MOVE_NONE;
break;
case 'x':
case 'X':
if (state == TO_RANK)
{
// Previous file was for disambiguation, or it's a pawn capture
fromFile = toFile;
state = TO_FILE;
}
else if (state != TO_FILE)
return MOVE_NONE;
break;
case '=':
if (state == PROMOTION_OR_CHECK)
state = PROMOTION;
else
return MOVE_NONE;
break;
case '+':
case '#':
if (state == PROMOTION_OR_CHECK || state == CHECK)
state = END;
else
return MOVE_NONE;
break;
default:
return MOVE_NONE;
break;
}
}
if (state != END)
return MOVE_NONE;
// Look for an unambiguous matching move
to = make_square(toFile, toRank);
matches = 0;
for (MoveStack* cur = mlist; cur != last; cur++)
{
from = move_from(cur->move);
if ( pos.type_of_piece_on(from) == pt
&& move_to(cur->move) == to
&& move_promotion_piece(cur->move) == promotion
&& (fromFile == FILE_NONE || fromFile == square_file(from))
&& (fromRank == RANK_NONE || fromRank == square_rank(from)))
{
move = cur->move;
matches++;
}
}
return matches == 1 ? move : MOVE_NONE;
}
/// line_to_san() takes a position and a line (an array of moves representing
/// a sequence of legal moves from the position) as input, and returns a
/// string containing the line in short algebraic notation. If the boolean

1
src/san.h
View file

@ -39,7 +39,6 @@
extern const std::string move_to_uci(Move m, bool chess960);
extern Move move_from_uci(const Position& pos, const std::string& str);
extern const std::string move_to_san(Position& pos, Move m);
extern Move move_from_san(const Position& pos, const std::string& str);
extern const std::string line_to_san(const Position& pos, Move line[], int startColumn, bool breakLines);
extern const std::string pretty_pv(const Position& pos, int time, int depth, Value score, ValueType type, Move pv[]);