chore: add a separate Piece type

Author: raklaptudirm

games/src/ataxx/piece.rs

@@ -35,20 +35,24 @@ impl ops::Not for Color {
     }
 }
 
+representable_type!(
+    /// Piece represents the types of pieces in ataxx, namely Piece and Block.
+    enum Piece: u8 { Piece "x", Block "■", }
+);
+
 representable_type!(
     /// Piece represents all the possible ataxx pieces.
     enum ColoredPiece: u8 { Black "x", White "o", Block "■", }
 );
 
 impl ColoredPieceType for ColoredPiece {
-    type Piece = Color;
+    type Piece = Piece;
     type Color = Color;
 
-    fn piece(self) -> Color {
+    fn piece(self) -> Piece {
         match self {
-            ColoredPiece::Black => Color::Black,
-            ColoredPiece::White => Color::White,
-            _ => panic!("Piece::color() called on Piece::Block"),
+            ColoredPiece::Black | ColoredPiece::White => Piece::Piece,
+            ColoredPiece::Block => Piece::Block,
         }
     }
 

games/src/ataxx/position.rs

@@ -27,7 +27,7 @@ use thiserror::Error;
 #[rustfmt::skip]
 use crate::ataxx::{
     BitBoard, ColoredPiece, File, Hash, Move,
-    Rank, Square, Color
+    Rank, Square, Color, Piece
 };
 use crate::interface::MoveStore;
 
@@ -83,7 +83,7 @@ impl PositionType for Position {
         }
     }
 
-    fn piece_bb(&self, piece: Color) -> BitBoard {
+    fn piece_bb(&self, piece: Piece) -> BitBoard {
         self.bitboards[piece as usize]
     }