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Use 'ChessBoardBuilder' in 'FromFen'

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This will allow taking this *out* of the module, now that we don't need
to reach into the internals of 'ChessBoard'.
This commit is contained in:
Bruno BELANYI 2024-04-01 21:32:02 +01:00
parent 829362dbce
commit b9cc60be9c
1 changed files with 21 additions and 29 deletions
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50
src/board/chess_board/mod.rs
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@ -417,22 +417,33 @@ impl FromFen for ChessBoard {
let half_move_clock = split.next().ok_or(FenError::InvalidFen)?;
let full_move_counter = split.next().ok_or(FenError::InvalidFen)?;
let mut builder = ChessBoardBuilder::new();
let castle_rights = <[CastleRights; 2]>::from_fen(castling_rights)?;
for color in Color::iter() {
builder.with_castle_rights(castle_rights[color.index()], color);
}
let side = Color::from_fen(side_to_move)?;
let en_passant = Option::<Square>::from_fen(en_passant_square)?;
builder.with_current_player(side);
if let Some(square) = Option::<Square>::from_fen(en_passant_square)? {
builder.with_en_passant(square);
};
let half_move_clock = half_move_clock
.parse::<u8>()
.map_err(|_| FenError::InvalidFen)?;
builder.with_half_move_clock(half_move_clock);
let full_move_counter = full_move_counter
.parse::<u32>()
.map_err(|_| FenError::InvalidFen)?;
let total_plies = (full_move_counter - 1) * 2 + if side == Color::White { 0 } else { 1 };
let (piece_occupancy, color_occupancy, combined_occupancy) = {
let (mut pieces, mut colors, mut combined) =
([Bitboard::EMPTY; 6], [Bitboard::EMPTY; 2], Bitboard::EMPTY);
builder.with_total_plies(
(full_move_counter - 1) * 2 + if side == Color::White { 0 } else { 1 },
);
{
let mut rank: usize = 8;
for rank_str in piece_placement.split('/') {
rank -= 1;
@ -451,17 +462,15 @@ impl FromFen for ChessBoard {
}
_ => Piece::from_fen(&c.to_string())?,
};
let (piece_board, color_board) =
(&mut pieces[piece.index()], &mut colors[color.index()]);
// Only need to worry about underflow since those are `usize` values.
if file >= 8 || rank >= 8 {
return Err(FenError::InvalidFen);
};
let square = Square::new(File::from_index(file), Rank::from_index(rank));
*piece_board |= square;
*color_board |= square;
combined |= square;
builder[square] = Some((piece, color));
file += 1;
}
// We haven't read exactly 8 files.
@ -473,26 +482,9 @@ impl FromFen for ChessBoard {
if rank != 0 {
return Err(FenError::InvalidFen);
}
(pieces, colors, combined)
};
let res = Self {
piece_occupancy,
color_occupancy,
combined_occupancy,
castle_rights,
en_passant,
half_move_clock,
total_plies,
side,
};
if let Err(err) = res.validate() {
return Err(FenError::InvalidPosition(err));
}
Ok(res)
Ok(builder.try_into()?)
}
}