chess/
color.rs

1use crate::rank::Rank;
2use std::ops::Not;
3
4/// Represent a color.
5#[derive(PartialOrd, PartialEq, Eq, Copy, Clone, Debug, Hash)]
6pub enum Color {
7	White,
8	Black,
9}
10
11/// How many colors are there?
12pub const NUM_COLORS: usize = 2;
13/// List all colors
14pub const ALL_COLORS: [Color; NUM_COLORS] = [Color::White, Color::Black];
15
16impl Color {
17	/// Convert the `Color` to a `usize` for table lookups.
18	#[inline]
19	pub fn to_index(self) -> usize {
20		self as usize
21	}
22
23	/// Convert a `Color` to my backrank, which represents the starting rank
24	/// for my pieces.
25	#[inline]
26	pub fn to_my_backrank(self) -> Rank {
27		match self {
28			Color::White => Rank::First,
29			Color::Black => Rank::Eighth,
30		}
31	}
32
33	/// Convert a `Color` to my opponents backrank, which represents the starting rank for the
34	/// opponents pieces.
35	#[inline]
36	pub fn to_their_backrank(self) -> Rank {
37		match self {
38			Color::White => Rank::Eighth,
39			Color::Black => Rank::First,
40		}
41	}
42
43	/// Convert a `Color` to my second rank, which represents the starting rank for my pawns.
44	#[inline]
45	pub fn to_second_rank(self) -> Rank {
46		match self {
47			Color::White => Rank::Second,
48			Color::Black => Rank::Seventh,
49		}
50	}
51
52	/// Convert a `Color` to my fourth rank, which represents the rank of my pawns when
53	/// moving two squares forward.
54	#[inline]
55	pub fn to_fourth_rank(self) -> Rank {
56		match self {
57			Color::White => Rank::Fourth,
58			Color::Black => Rank::Fifth,
59		}
60	}
61
62	/// Convert a `Color` to my seventh rank, which represents the rank before pawn promotion.
63	#[inline]
64	pub fn to_seventh_rank(self) -> Rank {
65		match self {
66			Color::White => Rank::Seventh,
67			Color::Black => Rank::Second,
68		}
69	}
70}
71
72impl Not for Color {
73	type Output = Color;
74
75	/// Get the other color.
76	#[inline]
77	fn not(self) -> Color {
78		if self == Color::White { Color::Black } else { Color::White }
79	}
80}
chess/color.rs

chess/
color.rs
