223 lines
7 KiB
Rust
223 lines
7 KiB
Rust
use crate::board::{Bitboard, CastleRights, Color, Direction, File, Square};
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// No castling moves included
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pub fn king_moves(square: Square) -> Bitboard {
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let board = square.into_bitboard();
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Direction::iter_royalty()
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.map(|dir| dir.move_board(board))
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.fold(Bitboard::EMPTY, |lhs, rhs| lhs | rhs)
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}
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pub fn king_castling_moves(color: Color, castle_rights: CastleRights) -> Bitboard {
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let rank = color.first_rank();
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let king_side_square = Square::new(File::G, rank);
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let queen_side_square = Square::new(File::C, rank);
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match castle_rights {
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CastleRights::NoSide => Bitboard::EMPTY,
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CastleRights::KingSide => king_side_square.into_bitboard(),
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CastleRights::QueenSide => queen_side_square.into_bitboard(),
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CastleRights::BothSides => king_side_square | queen_side_square,
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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 moves_first_rank() {
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assert_eq!(king_moves(Square::A1), Square::A2 | Square::B1 | Square::B2);
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assert_eq!(
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king_moves(Square::B1),
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Square::A1 | Square::A2 | Square::B2 | Square::C1 | Square::C2
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);
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assert_eq!(
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king_moves(Square::C1),
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Square::B1 | Square::B2 | Square::C2 | Square::D1 | Square::D2
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);
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assert_eq!(
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king_moves(Square::D1),
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Square::C1 | Square::C2 | Square::D2 | Square::E1 | Square::E2
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);
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assert_eq!(
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king_moves(Square::E1),
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Square::D1 | Square::D2 | Square::E2 | Square::F1 | Square::F2
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);
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assert_eq!(
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king_moves(Square::F1),
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Square::E1 | Square::E2 | Square::F2 | Square::G1 | Square::G2
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);
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assert_eq!(
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king_moves(Square::G1),
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Square::F1 | Square::F2 | Square::G2 | Square::H1 | Square::H2
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);
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assert_eq!(king_moves(Square::H1), Square::G1 | Square::G2 | Square::H2);
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}
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#[test]
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fn moves_last_rank() {
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assert_eq!(king_moves(Square::A8), Square::A7 | Square::B8 | Square::B7);
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assert_eq!(
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king_moves(Square::B8),
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Square::A8 | Square::A7 | Square::B7 | Square::C8 | Square::C7
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);
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assert_eq!(
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king_moves(Square::C8),
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Square::B8 | Square::B7 | Square::C7 | Square::D8 | Square::D7
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);
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assert_eq!(
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king_moves(Square::D8),
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Square::C8 | Square::C7 | Square::D7 | Square::E8 | Square::E7
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);
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assert_eq!(
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king_moves(Square::E8),
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Square::D8 | Square::D7 | Square::E7 | Square::F8 | Square::F7
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);
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assert_eq!(
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king_moves(Square::F8),
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Square::E8 | Square::E7 | Square::F7 | Square::G8 | Square::G7
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);
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assert_eq!(
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king_moves(Square::G8),
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Square::F8 | Square::F7 | Square::G7 | Square::H8 | Square::H7
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);
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assert_eq!(king_moves(Square::H8), Square::G8 | Square::G7 | Square::H7);
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}
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#[test]
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fn moves_first_file() {
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assert_eq!(king_moves(Square::A1), Square::A2 | Square::B1 | Square::B2);
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assert_eq!(
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king_moves(Square::A2),
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Square::A1 | Square::A3 | Square::B1 | Square::B2 | Square::B3
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);
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assert_eq!(
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king_moves(Square::A3),
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Square::A2 | Square::A4 | Square::B2 | Square::B3 | Square::B4
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);
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assert_eq!(
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king_moves(Square::A4),
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Square::A3 | Square::A5 | Square::B3 | Square::B4 | Square::B5
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);
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assert_eq!(
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king_moves(Square::A5),
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Square::A4 | Square::A6 | Square::B4 | Square::B5 | Square::B6
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);
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assert_eq!(
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king_moves(Square::A6),
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Square::A5 | Square::A7 | Square::B5 | Square::B6 | Square::B7
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);
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assert_eq!(
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king_moves(Square::A7),
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Square::A6 | Square::A8 | Square::B6 | Square::B7 | Square::B8
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);
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assert_eq!(king_moves(Square::A8), Square::A7 | Square::B7 | Square::B8);
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}
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#[test]
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fn moves_last_file() {
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assert_eq!(king_moves(Square::H1), Square::H2 | Square::G1 | Square::G2);
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assert_eq!(
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king_moves(Square::H2),
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Square::H1 | Square::H3 | Square::G1 | Square::G2 | Square::G3
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);
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assert_eq!(
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king_moves(Square::H3),
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Square::H2 | Square::H4 | Square::G2 | Square::G3 | Square::G4
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);
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assert_eq!(
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king_moves(Square::H4),
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Square::H3 | Square::H5 | Square::G3 | Square::G4 | Square::G5
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);
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assert_eq!(
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king_moves(Square::H5),
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Square::H4 | Square::H6 | Square::G4 | Square::G5 | Square::G6
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);
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assert_eq!(
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king_moves(Square::H6),
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Square::H5 | Square::H7 | Square::G5 | Square::G6 | Square::G7
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);
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assert_eq!(
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king_moves(Square::H7),
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Square::H6 | Square::H8 | Square::G6 | Square::G7 | Square::G8
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);
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assert_eq!(king_moves(Square::H8), Square::H7 | Square::G7 | Square::G8);
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}
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#[test]
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fn moves_middle() {
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assert_eq!(
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king_moves(Square::D4),
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Square::C3
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| Square::C4
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| Square::C5
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| Square::D3
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| Square::D5
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| Square::E3
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| Square::E4
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| Square::E5
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);
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assert_eq!(
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king_moves(Square::D5),
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Square::C4
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| Square::C5
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| Square::C6
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| Square::D4
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| Square::D6
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| Square::E4
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| Square::E5
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| Square::E6
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);
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assert_eq!(
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king_moves(Square::E5),
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Square::D4
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| Square::D5
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| Square::D6
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| Square::E4
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| Square::E6
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| Square::F4
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| Square::F5
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| Square::F6
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);
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}
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#[test]
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fn castling_moves() {
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assert_eq!(
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king_castling_moves(Color::White, CastleRights::NoSide),
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Bitboard::EMPTY
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);
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assert_eq!(
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king_castling_moves(Color::Black, CastleRights::NoSide),
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Bitboard::EMPTY
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);
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assert_eq!(
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king_castling_moves(Color::White, CastleRights::KingSide),
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Square::G1.into_bitboard()
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);
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assert_eq!(
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king_castling_moves(Color::Black, CastleRights::KingSide),
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Square::G8.into_bitboard()
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);
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assert_eq!(
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king_castling_moves(Color::White, CastleRights::QueenSide),
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Square::C1.into_bitboard()
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);
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assert_eq!(
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king_castling_moves(Color::Black, CastleRights::QueenSide),
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Square::C8.into_bitboard()
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);
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assert_eq!(
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king_castling_moves(Color::White, CastleRights::BothSides),
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Square::C1 | Square::G1
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);
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assert_eq!(
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king_castling_moves(Color::Black, CastleRights::BothSides),
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Square::C8 | Square::G8
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);
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}
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}
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