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[board] Remove BoardSide enum; use Castle everywhere

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Move Castle to a castle module inside the move module.
Implement into_index() on Castle to turn it into a usize.
This commit is contained in:
Eryn Wells 2024-01-21 10:38:50 -08:00
parent 21b5266789
commit fa1c6b452e
8 changed files with 95 additions and 63 deletions
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87
board/src/move.rs
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@ -2,12 +2,12 @@
use crate::{
piece::{Piece, PlacedPiece, Shape},
position::BoardSide,
square::Rank,
Square,
};
use std::fmt;
pub use castle::Castle;
pub(crate) use move_formatter::AlgebraicMoveFormatter;
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
@ -18,18 +18,81 @@ pub enum MakeMoveError {
IllegalCastle,
}
#[repr(u16)]
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum Castle {
KingSide = 0b10,
QueenSide = 0b11,
}
mod castle {
use crate::{Color, Square};
impl From<BoardSide> for Castle {
fn from(value: BoardSide) -> Self {
match value {
BoardSide::King => Castle::KingSide,
BoardSide::Queen => Castle::QueenSide,
#[repr(u16)]
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum Castle {
KingSide = 0b10,
QueenSide = 0b11,
}
pub(crate) struct Squares {
pub king: Square,
pub rook: Square,
}
impl Castle {
const STARTING_SQUARES: [[Squares; 2]; 2] = [
[
Squares {
king: Square::E1,
rook: Square::H1,
},
Squares {
king: Square::E1,
rook: Square::A1,
},
],
[
Squares {
king: Square::E8,
rook: Square::H8,
},
Squares {
king: Square::E8,
rook: Square::A8,
},
],
];
const TARGET_SQUARES: [[Squares; 2]; 2] = [
[
Squares {
king: Square::G1,
rook: Square::F1,
},
Squares {
king: Square::C1,
rook: Square::D1,
},
],
[
Squares {
king: Square::G8,
rook: Square::F8,
},
Squares {
king: Square::C8,
rook: Square::D8,
},
],
];
pub(crate) fn starting_squares(&self, color: Color) -> &'static Squares {
&Castle::STARTING_SQUARES[color as usize][self.into_index()]
}
pub(crate) fn target_squares(&self, color: Color) -> &'static Squares {
&Castle::TARGET_SQUARES[color as usize][self.into_index()]
}
pub(crate) fn into_index(&self) -> usize {
match self {
Castle::KingSide => 0,
Castle::QueenSide => 1,
}
}
}
}