1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
use bitboard::{BitBoard, EMPTY};
use color::Color;
use square::Square;
#[derive(Copy, Clone, PartialEq, PartialOrd)]
pub enum CastleRights {
NoRights,
KingSide,
QueenSide,
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(), 6) ^
BitBoard::set(color.to_my_backrank(), 5)
}
pub fn queenside_squares(&self, color: Color) -> BitBoard {
BitBoard::set(color.to_my_backrank(), 1) ^
BitBoard::set(color.to_my_backrank(), 2) ^
BitBoard::set(color.to_my_backrank(), 3)
}
pub fn remove(&self, remove: CastleRights) -> CastleRights {
CastleRights::from_index(self.to_index() & !remove.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(), 7),
CastleRights::QueenSide => BitBoard::set(color.to_my_backrank(), 0),
CastleRights::Both => BitBoard::set(color.to_my_backrank(), 0) ^
BitBoard::set(color.to_my_backrank(), 7)
}
}
pub fn rook_square_to_castle_rights(square: Square) -> CastleRights {
match square.file() {
0 => CastleRights::QueenSide,
7 => CastleRights::KingSide,
_ => unreachable!()
}
}
}