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[board] Use Castle as the interface type for methods related to castling

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Use BoardSide as an internal type for looking up generated bitboards, target squares, etc.
This commit is contained in:
Eryn Wells 2024-01-21 09:05:42 -08:00
parent 7071f6a742
commit 918b68f300
4 changed files with 71 additions and 37 deletions
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31
board/src/position/position.rs
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@ -5,6 +5,7 @@ use crate::{
move_generator::Moves,
piece::{Color, Piece, PlacedPiece, Shape},
position::DiagramFormatter,
r#move::Castle,
sight::Sight,
BitBoard, Move, Square,
};
@ -14,8 +15,17 @@ use std::{cell::OnceCell, fmt};
/// player's king starts on. Queenside is the side of the board the player's
/// queen starts on.
pub(crate) enum BoardSide {
King,
Queen,
King = 0,
Queen = 1,
}
impl From<Castle> for BoardSide {
fn from(value: Castle) -> Self {
match value {
Castle::KingSide => BoardSide::King,
Castle::QueenSide => BoardSide::Queen,
}
}
}
#[derive(Clone, Debug, Eq, PartialEq)]
@ -77,15 +87,26 @@ impl Position {
/// The right to castle on a particular side of the board is retained as
/// long as the player has not moved their king, or the rook on that side of
/// the board.
pub(crate) fn player_has_right_to_castle(&self, color: Color, castle: Castle) -> bool {
self.flags.player_has_right_to_castle(color, castle)
}
/// Returns `true` if the player is able to castle on the given side of the board.
///
/// The following requirements must also be met:
/// The following requirements must be met:
///
/// 1. The player must still have the right to castle on that side of the
/// board. The king and rook involved in the castle must not have moved.
/// 1. The spaces between the king and rook must be clear
/// 2. The king must not be in check
/// 3. In the course of castling on that side, the king must not pass
/// through a square that an enemy piece can see
pub(crate) fn player_has_right_to_castle(&self, color: Color, side: BoardSide) -> bool {
self.flags.player_has_right_to_castle(color, side)
pub(crate) fn player_can_castle(&self, player: Color, castle: Castle) -> bool {
if !self.player_has_right_to_castle(player, castle.into()) {
return false;
}
true
}
pub fn moves(&self) -> Moves {