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Assume input FEN string is correct in from_fen()

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And also tolerate a 0 value for full move number.

Revert BUG_41 patch, now we set initial King file only
if a castling is possible, so we don't need the fix
anymore in case of correct FEN.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2011-06-27 10:07:57 +01:00
parent 9305983018
commit c9b24c3358
5 changed files with 75 additions and 94 deletions
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144
src/position.cpp
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@@ -48,8 +48,8 @@ Score Position::PieceSquareTable[16][64];
const Value PieceValueMidgame[17] = {
VALUE_ZERO,
PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
RookValueMidgame, QueenValueMidgame, VALUE_ZERO,
VALUE_ZERO, VALUE_ZERO,
RookValueMidgame, QueenValueMidgame,
VALUE_ZERO, VALUE_ZERO, VALUE_ZERO,
PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
RookValueMidgame, QueenValueMidgame
};
@@ -57,8 +57,8 @@ const Value PieceValueMidgame[17] = {
const Value PieceValueEndgame[17] = {
VALUE_ZERO,
PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
RookValueEndgame, QueenValueEndgame, VALUE_ZERO,
VALUE_ZERO, VALUE_ZERO,
RookValueEndgame, QueenValueEndgame,
VALUE_ZERO, VALUE_ZERO, VALUE_ZERO,
PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
RookValueEndgame, QueenValueEndgame
};
@@ -121,7 +121,7 @@ void Position::detach() {
startState = *st;
st = &startState;
st->previous = NULL; // as a safe guard
st->previous = NULL; // As a safe guard
}
@@ -159,64 +159,56 @@ void Position::from_fen(const string& fen, bool isChess960) {
*/
char token;
int hmc, fmn;
size_t p;
string ep;
Square sq = SQ_A8;
std::istringstream ss(fen);
clear();
ss >> std::noskipws;
ss >> std::skipws >> token >> std::noskipws;
// 1. Piece placement field
while ((ss >> token) && !isspace(token))
// 1. Piece placement
while (!isspace(token))
{
if ((p = PieceToChar.find(token)) != string::npos)
if (token == '/')
sq -= Square(16); // Jump back of 2 rows
else if (isdigit(token))
sq += Square(token - '0'); // Skip the given number of files
else if ((p = PieceToChar.find(token)) != string::npos)
{
put_piece(Piece(p), sq);
sq++;
}
else if (isdigit(token))
sq += Square(token - '0'); // Skip the given number of files
else if (token == '/')
sq -= SQ_A3; // Jump back of 2 rows
else
goto incorrect_fen;
ss >> token;
}
// 2. Active color
if (!(ss >> token) || (token != 'w' && token != 'b'))
goto incorrect_fen;
ss >> std::skipws >> token;
sideToMove = (token == 'w' ? WHITE : BLACK);
if (!(ss >> token) || !isspace(token))
goto incorrect_fen;
// 3. Castling availability
while ((ss >> token) && !isspace(token))
if (!set_castling_rights(token))
goto incorrect_fen;
// 4. En passant square
char col, row;
if ( ((ss >> col) && (col >= 'a' && col <= 'h'))
&& ((ss >> row) && (row == '3' || row == '6')))
ss >> token >> std::noskipws;
while (token != '-' && !isspace(token))
{
st->epSquare = make_square(File(col - 'a') + FILE_A, Rank(row - '1') + RANK_1);
set_castling_rights(token);
ss >> token;
}
// Ignore if no capture is possible
Color them = opposite_color(sideToMove);
if (!(attacks_from<PAWN>(st->epSquare, them) & pieces(PAWN, sideToMove)))
// 4. En passant square. Ignore if no pawn capture is possible
ss >> std::skipws >> ep;
if (ep.size() == 2)
{
st->epSquare = make_square(File(ep[0] - 'a'), Rank(ep[1] - '1'));
if (!(attackers_to(st->epSquare) & pieces(PAWN, sideToMove)))
st->epSquare = SQ_NONE;
}
// 5. Halfmove clock
if (ss >> std::skipws >> hmc)
st->rule50 = hmc;
// 6. Fullmove number
if (ss >> fmn)
startPosPlyCounter = (fmn - 1) * 2 + int(sideToMove == BLACK);
// 5-6. Halfmove clock and fullmove number
ss >> st->rule50 >> fullMoves;
// Various initialisations
castleRightsMask[make_square(initialKFile, RANK_1)] ^= WHITE_OO | WHITE_OOO;
@@ -235,10 +227,6 @@ void Position::from_fen(const string& fen, bool isChess960) {
st->value = compute_value();
st->npMaterial[WHITE] = compute_non_pawn_material(WHITE);
st->npMaterial[BLACK] = compute_non_pawn_material(BLACK);
return;
incorrect_fen:
cout << "Error in FEN string: " << fen << endl;
}
@@ -249,39 +237,39 @@ incorrect_fen:
/// associated with the castling right, the traditional castling tag will be replaced
/// by the file letter of the involved rook as for the Shredder-FEN.
bool Position::set_castling_rights(char token) {
void Position::set_castling_rights(char token) {
Color c = token >= 'a' ? BLACK : WHITE;
Square sqA = (c == WHITE ? SQ_A1 : SQ_A8);
Square sqH = (c == WHITE ? SQ_H1 : SQ_H8);
Piece rook = (c == WHITE ? WR : BR);
Color c = islower(token) ? BLACK : WHITE;
Square sqA = relative_square(c, SQ_A1);
Square sqH = relative_square(c, SQ_H1);
initialKFile = square_file(king_square(c));
token = char(toupper(token));
if (token == 'K')
if (toupper(token) == 'K')
{
for (Square sq = sqH; sq >= sqA; sq--)
if (piece_on(sq) == rook)
if (piece_on(sq) == make_piece(c, ROOK))
{
set_castle_kingside(c);
initialKRFile = square_file(sq);
break;
}
}
else if (token == 'Q')
else if (toupper(token) == 'Q')
{
for (Square sq = sqA; sq <= sqH; sq++)
if (piece_on(sq) == rook)
if (piece_on(sq) == make_piece(c, ROOK))
{
set_castle_queenside(c);
initialQRFile = square_file(sq);
break;
}
}
else if (token >= 'A' && token <= 'H')
else if (toupper(token) >= 'A' && toupper(token) <= 'H')
{
File rookFile = File(token - 'A') + FILE_A;
File rookFile = File(toupper(token) - 'A');
if (rookFile < initialKFile)
{
set_castle_queenside(c);
@@ -293,10 +281,6 @@ bool Position::set_castling_rights(char token) {
initialKRFile = rookFile;
}
}
else
return token == '-';
return true;
}
@@ -593,8 +577,8 @@ bool Position::pl_move_is_legal(Move m, Bitboard pinned) const {
}
/// Position::move_is_pl_slow() takes a position and a move and tests whether
/// the move is pseudo legal. This version is not very fast and should be used
/// Position::move_is_pl_slow() takes a move and tests whether the move
/// is pseudo legal. This version is not very fast and should be used
/// only in non time-critical paths.
bool Position::move_is_pl_slow(const Move m) const {
@@ -613,8 +597,8 @@ bool Position::move_is_pl_slow(const Move m) const {
}
/// Fast version of Position::move_is_pl() that takes a position a move and a
/// bitboard of pinned pieces as input, and tests whether the move is pseudo legal.
/// Fast version of Position::move_is_pl() that takes a move and a bitboard
/// of pinned pieces as input, and tests whether the move is pseudo legal.
bool Position::move_is_pl(const Move m) const {
@@ -839,6 +823,10 @@ void Position::do_setup_move(Move m) {
StateInfo newSt;
// Update the number of full moves after black's move
if (sideToMove == BLACK)
fullMoves++;
do_move(m, newSt);
// Reset "game ply" in case we made a non-reversible move.
@@ -846,9 +834,6 @@ void Position::do_setup_move(Move m) {
if (st->rule50 == 0)
st->gamePly = 0;
// Update the number of plies played from the starting position
startPosPlyCounter++;
// Our StateInfo newSt is about going out of scope so copy
// its content before it disappears.
detach();
@@ -1591,7 +1576,7 @@ void Position::clear() {
st = &startState;
memset(st, 0, sizeof(StateInfo));
st->epSquare = SQ_NONE;
startPosPlyCounter = 0;
fullMoves = 1;
nodes = 0;
memset(byColorBB, 0, sizeof(Bitboard) * 2);
@@ -2039,19 +2024,14 @@ bool Position::is_ok(int* failedStep) const {
if (can_castle_queenside(c) && piece_on(initial_qr_square(c)) != make_piece(c, ROOK))
return false;
}
// If we cannot castle castleRightsMask[] could be not valid, for instance when
// king initial file is FILE_A as queen rook.
if (can_castle(WHITE) || can_castle(BLACK))
{
if (castleRightsMask[initial_kr_square(WHITE)] != (ALL_CASTLES ^ WHITE_OO))
return false;
if (castleRightsMask[initial_qr_square(WHITE)] != (ALL_CASTLES ^ WHITE_OOO))
return false;
if (castleRightsMask[initial_kr_square(BLACK)] != (ALL_CASTLES ^ BLACK_OO))
return false;
if (castleRightsMask[initial_qr_square(BLACK)] != (ALL_CASTLES ^ BLACK_OOO))
return false;
}
if (castleRightsMask[initial_kr_square(WHITE)] != (ALL_CASTLES ^ WHITE_OO))
return false;
if (castleRightsMask[initial_qr_square(WHITE)] != (ALL_CASTLES ^ WHITE_OOO))
return false;
if (castleRightsMask[initial_kr_square(BLACK)] != (ALL_CASTLES ^ BLACK_OO))
return false;
if (castleRightsMask[initial_qr_square(BLACK)] != (ALL_CASTLES ^ BLACK_OOO))
return false;
}
if (failedStep) *failedStep = 0;