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Code Issues Releases Wiki Activity

Small touches in FEN decoding

Browse source 
No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2012-01-12 18:12:25 +01:00
parent c19ea4b000
commit c549f71f64
2 changed files with 16 additions and 17 deletions
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31
src/position.cpp
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@ -165,11 +165,11 @@ void Position::from_fen(const string& fenStr, bool isChess960) {
// 1. Piece placement
while ((fen >> token) && !isspace(token))
{
if (token == '/')
sq -= Square(16); // Jump back of 2 rows
if (isdigit(token))
sq += Square(token - '0'); // Advance the given number of files
else if (isdigit(token))
sq += Square(token - '0'); // Skip the given number of files
else if (token == '/')
sq = make_square(FILE_A, rank_of(sq) - Rank(2));
else if ((p = PieceToChar.find(token)) != string::npos)
{
@ -192,15 +192,14 @@ void Position::from_fen(const string& fenStr, bool isChess960) {
{
Square rsq;
Color c = islower(token) ? BLACK : WHITE;
Piece rook = make_piece(c, ROOK);
token = char(toupper(token));
if (token == 'K')
for (rsq = relative_square(c, SQ_H1); piece_on(rsq) != rook; rsq--) {}
for (rsq = relative_square(c, SQ_H1); type_of(piece_on(rsq)) != ROOK; rsq--) {}
else if (token == 'Q')
for (rsq = relative_square(c, SQ_A1); piece_on(rsq) != rook; rsq++) {}
for (rsq = relative_square(c, SQ_A1); type_of(piece_on(rsq)) != ROOK; rsq++) {}
else if (token >= 'A' && token <= 'H')
rsq = make_square(File(token - 'A'), relative_rank(c, RANK_1));
@ -208,7 +207,7 @@ void Position::from_fen(const string& fenStr, bool isChess960) {
else
continue;
set_castle_right(king_square(c), rsq);
set_castle_right(c, rsq);
}
// 4. En passant square. Ignore if no pawn capture is possible
@ -242,14 +241,14 @@ void Position::from_fen(const string& fenStr, bool isChess960) {
/// Position::set_castle_right() is an helper function used to set castling
/// rights given the corresponding king and rook starting squares.
/// rights given the corresponding color and the rook starting square.
void Position::set_castle_right(Square ksq, Square rsq) {
void Position::set_castle_right(Color c, Square rsq) {
int f = (rsq < ksq ? WHITE_OOO : WHITE_OO) << color_of(piece_on(ksq));
int f = (rsq < king_square(c) ? WHITE_OOO : WHITE_OO) << c;
st->castleRights |= f;
castleRightsMask[ksq] ^= f;
castleRightsMask[king_square(c)] ^= f;
castleRightsMask[rsq] ^= f;
castleRookSquare[f] = rsq;
}
@ -1589,13 +1588,13 @@ void Position::flip_me() {
// Castling rights
if (pos.can_castle(WHITE_OO))
set_castle_right(king_square(BLACK), flip(pos.castle_rook_square(WHITE_OO)));
set_castle_right(BLACK, flip(pos.castle_rook_square(WHITE_OO)));
if (pos.can_castle(WHITE_OOO))
set_castle_right(king_square(BLACK), flip(pos.castle_rook_square(WHITE_OOO)));
set_castle_right(BLACK, flip(pos.castle_rook_square(WHITE_OOO)));
if (pos.can_castle(BLACK_OO))
set_castle_right(king_square(WHITE), flip(pos.castle_rook_square(BLACK_OO)));
set_castle_right(WHITE, flip(pos.castle_rook_square(BLACK_OO)));
if (pos.can_castle(BLACK_OOO))
set_castle_right(king_square(WHITE), flip(pos.castle_rook_square(BLACK_OOO)));
set_castle_right(WHITE, flip(pos.castle_rook_square(BLACK_OOO)));
// En passant square
if (pos.st->epSquare != SQ_NONE)

2
src/position.h
View file

@ -210,7 +210,7 @@ private:
// Initialization helper functions (used while setting up a position)
void clear();
void put_piece(Piece p, Square s);
void set_castle_right(Square ksq, Square rsq);
void set_castle_right(Color c, Square rsq);
bool move_is_legal(const Move m) const;
// Helper template functions