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[position] Remove castle module (it went to board)

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Eryn Wells 2025-05-23 09:50:57 -07:00
parent e89bca9877
commit 609cda0fe5
2 changed files with 0 additions and 235 deletions
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2
position/src/position.rs
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@ -1,11 +1,9 @@
// Eryn Wells <eryn@erynwells.me>
mod castle;
mod make_move;
mod position;
pub use {
castle::CastleEvaluationError,
make_move::{MakeMoveError, ValidateMove},
position::Position,
};

233
position/src/position/castle.rs
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@ -1,233 +0,0 @@
// Eryn Wells <eryn@erynwells.me>
use crate::Position;
use chessfriend_core::{Color, Piece, Square, Wing};
use thiserror::Error;
#[derive(Clone, Copy, Debug, Error, Eq, PartialEq)]
pub enum CastleEvaluationError {
#[error("{color} does not have the right to castle {wing}")]
NoRights { color: Color, wing: Wing },
#[error("no king")]
NoKing,
#[error("no rook")]
NoRook,
#[error("castling path is not clear")]
ObstructingPieces,
#[error("opposing pieces check castling path")]
CheckingPieces,
}
impl Position {
/// Evaluates whether the active color can castle toward the given wing of the board in the
/// current position.
///
/// ## Errors
///
/// Returns an error indicating why the active color cannot castle.
pub fn active_color_can_castle(&self, wing: Wing) -> Result<(), CastleEvaluationError> {
// TODO: Cache this result. It's expensive!
let active_color = self.board.active_color;
if !self
.board
.castling_rights
.color_has_right(active_color, wing)
{
return Err(CastleEvaluationError::NoRights {
color: active_color,
wing,
});
}
let parameters = self.board.castling_parameters(wing);
if self.castling_king(parameters.origin.king).is_none() {
return Err(CastleEvaluationError::NoKing);
}
if self.castling_rook(parameters.origin.rook).is_none() {
return Err(CastleEvaluationError::NoRook);
}
// All squares must be clear.
let has_obstructing_pieces = (self.board.occupancy() & parameters.clear).is_populated();
if has_obstructing_pieces {
return Err(CastleEvaluationError::ObstructingPieces);
}
// King cannot pass through check.
let opposing_sight = self.opposing_sight();
let opposing_pieces_can_see_castling_path =
(parameters.check & opposing_sight).is_populated();
if opposing_pieces_can_see_castling_path {
return Err(CastleEvaluationError::CheckingPieces);
}
Ok(())
}
pub(crate) fn castling_king(&self, square: Square) -> Option<Piece> {
let active_color = self.board.active_color;
self.get_piece(square)
.filter(|piece| piece.color == active_color && piece.is_king())
}
pub(crate) fn castling_rook(&self, square: Square) -> Option<Piece> {
let active_color = self.board.active_color;
self.get_piece(square)
.filter(|piece| piece.color == active_color && piece.is_rook())
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::test_position;
use chessfriend_core::{piece, Color, Wing};
#[test]
fn king_on_starting_square_can_castle() {
let pos = test_position!(
White King on E1,
White Rook on A1,
White Rook on H1
);
let rights = pos.board.castling_rights;
assert!(rights.color_has_right(Color::White, Wing::KingSide));
assert!(rights.color_has_right(Color::White, Wing::QueenSide));
}
#[test]
fn king_for_castle() {
let pos = test_position![
White King on E1,
White Rook on H1,
White Rook on A1,
];
let kingside_parameters = pos.board.castling_parameters(Wing::KingSide);
assert_eq!(
pos.castling_king(kingside_parameters.origin.king),
Some(piece!(White King))
);
let queenside_parameters = pos.board.castling_parameters(Wing::QueenSide);
assert_eq!(
pos.castling_king(queenside_parameters.origin.king),
Some(piece!(White King))
);
}
#[test]
fn rook_for_castle() {
let pos = test_position![
White King on E1,
White Rook on H1,
];
let kingside_parameters = pos.board.castling_parameters(Wing::KingSide);
assert_eq!(
pos.castling_rook(kingside_parameters.origin.rook),
Some(piece!(White Rook))
);
let pos = test_position![
White King on E1,
White Rook on A1,
];
let queenside_parameters = pos.board.castling_parameters(Wing::QueenSide);
assert_eq!(
pos.castling_rook(queenside_parameters.origin.rook),
Some(piece!(White Rook))
);
}
#[test]
fn white_can_castle() {
let pos = test_position![
White King on E1,
White Rook on H1,
White Rook on A1,
];
assert_eq!(pos.active_color_can_castle(Wing::KingSide), Ok(()));
assert_eq!(pos.active_color_can_castle(Wing::QueenSide), Ok(()));
}
#[test]
fn white_cannot_castle_missing_king() {
let pos = test_position![
White King on E2,
White Rook on H1,
White Rook on A1,
];
assert_eq!(
pos.active_color_can_castle(Wing::KingSide),
Err(CastleEvaluationError::NoKing)
);
assert_eq!(
pos.active_color_can_castle(Wing::QueenSide),
Err(CastleEvaluationError::NoKing)
);
}
#[test]
fn white_cannot_castle_missing_rook() {
let pos = test_position![
White King on E1,
White Rook on A1,
];
assert_eq!(
pos.active_color_can_castle(Wing::KingSide),
Err(CastleEvaluationError::NoRook)
);
let pos = test_position![
White King on E1,
White Rook on H1,
];
assert_eq!(
pos.active_color_can_castle(Wing::QueenSide),
Err(CastleEvaluationError::NoRook)
);
}
#[test]
fn white_cannot_castle_obstructing_piece() {
let pos = test_position![
White King on E1,
White Bishop on F1,
White Rook on H1,
White Rook on A1,
];
assert_eq!(
pos.active_color_can_castle(Wing::KingSide),
Err(CastleEvaluationError::ObstructingPieces)
);
assert_eq!(pos.active_color_can_castle(Wing::QueenSide), Ok(()));
}
#[test]
fn white_cannot_castle_checking_pieces() {
let pos = test_position![
White King on E1,
White Rook on H1,
White Rook on A1,
Black Queen on C6,
];
assert_eq!(pos.active_color_can_castle(Wing::KingSide), Ok(()));
assert_eq!(
pos.active_color_can_castle(Wing::QueenSide),
Err(CastleEvaluationError::CheckingPieces)
);
}
}