107 lines
2.7 KiB
Rust
107 lines
2.7 KiB
Rust
use super::Rank;
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/// An enum representing the color of a player.
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#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub enum Color {
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White,
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Black,
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}
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impl Color {
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/// Convert from a file index into a [Color] type.
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#[inline(always)]
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pub fn from_index(index: usize) -> Self {
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assert!(index < 2);
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// SAFETY: we know the value is in-bounds
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unsafe { Self::from_index_unchecked(index) }
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}
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/// Convert from a file index into a [Color] type, no bounds checking.
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///
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/// # Safety
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///
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/// Should only be called with values that can be output by [Color::index()].
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#[inline(always)]
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pub unsafe fn from_index_unchecked(index: usize) -> Self {
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std::mem::transmute(index as u8)
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}
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/// Return the index of a given [Color].
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#[inline(always)]
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pub fn index(self) -> usize {
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self as usize
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}
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/// Return the first [Rank] for pieces of the given [Color], where its pieces start.
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#[inline(always)]
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pub fn first_rank(self) -> Rank {
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match self {
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Self::White => Rank::First,
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Self::Black => Rank::Eighth,
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}
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}
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/// Return the second [Rank] for pieces of the given [Color], where its pawns start.
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#[inline(always)]
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pub fn second_rank(self) -> Rank {
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match self {
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Self::White => Rank::Second,
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Self::Black => Rank::Seventh,
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}
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}
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/// Return the fourth [Rank] for pieces of the given [Color], where its pawns move to after a
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/// two-square move.
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#[inline(always)]
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pub fn fourth_rank(self) -> Rank {
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match self {
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Self::White => Rank::Fourth,
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Self::Black => Rank::Fifth,
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}
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}
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/// Return the seventh [Rank] for pieces of the given [Color], which is the rank before a pawn
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/// gets promoted.
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#[inline(always)]
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pub fn seventh_rank(self) -> Rank {
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match self {
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Self::White => Rank::Seventh,
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Self::Black => Rank::Second,
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}
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}
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}
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impl std::ops::Not for Color {
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type Output = Color;
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fn not(self) -> Self::Output {
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match self {
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Self::White => Self::Black,
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Self::Black => Self::White,
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}
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn from_index() {
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assert_eq!(Color::from_index(0), Color::White);
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assert_eq!(Color::from_index(1), Color::Black);
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}
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#[test]
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fn index() {
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assert_eq!(Color::White.index(), 0);
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assert_eq!(Color::Black.index(), 1);
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}
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#[test]
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fn not() {
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assert_eq!(!Color::White, Color::Black);
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assert_eq!(!Color::Black, Color::White);
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}
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}
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