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use bitboard::{BitBoard, EMPTY};
use color::Color;
use square::Square;
use file::File;
#[derive(Copy, Clone, PartialEq, PartialOrd, Debug)]
pub enum CastleRights {
NoRights,
KingSide,
QueenSide,
Both,
}
pub const NUM_CASTLE_RIGHTS: usize = 4;
pub const ALL_CASTLE_RIGHTS: [CastleRights; NUM_CASTLE_RIGHTS] = [CastleRights::NoRights, CastleRights::KingSide, CastleRights::QueenSide, CastleRights::Both];
impl CastleRights {
pub fn has_kingside(&self) -> bool {
self.to_index() & 1 == 1
}
pub fn has_queenside(&self) -> bool {
self.to_index() & 2 == 2
}
pub fn kingside_squares(&self, color: Color) -> BitBoard {
BitBoard::set(color.to_my_backrank(), File::F) ^
BitBoard::set(color.to_my_backrank(), File::G)
}
pub fn queenside_squares(&self, color: Color) -> BitBoard {
BitBoard::set(color.to_my_backrank(), File::B) ^
BitBoard::set(color.to_my_backrank(), File::C) ^
BitBoard::set(color.to_my_backrank(), File::D)
}
pub fn remove(&self, remove: CastleRights) -> CastleRights {
CastleRights::from_index(self.to_index() & !remove.to_index())
}
pub fn add(&self, add: CastleRights) -> CastleRights {
CastleRights::from_index(self.to_index() | add.to_index())
}
pub fn to_index(&self) -> usize {
*self as usize
}
pub fn from_index(i: usize) -> CastleRights {
match i {
0 => CastleRights::NoRights,
1 => CastleRights::KingSide,
2 => CastleRights::QueenSide,
3 => CastleRights::Both,
_ => unreachable!()
}
}
pub fn unmoved_rooks(&self, color: Color) -> BitBoard {
match *self {
CastleRights::NoRights => EMPTY,
CastleRights::KingSide => BitBoard::set(color.to_my_backrank(), File::H),
CastleRights::QueenSide => BitBoard::set(color.to_my_backrank(), File::A),
CastleRights::Both => BitBoard::set(color.to_my_backrank(), File::A) ^
BitBoard::set(color.to_my_backrank(), File::H)
}
}
pub fn rook_square_to_castle_rights(square: Square) -> CastleRights {
match square.get_file() {
File::A => CastleRights::QueenSide,
File::H => CastleRights::KingSide,
_ => unreachable!()
}
}
}