[board] Clean up interfaces of pieces and square structs

board/src/piece.rs

@@ -111,8 +111,8 @@ pub enum PiecePlacementError {
 
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub struct Piece {
-    pub color: Color,
-    pub shape: Shape,
+    color: Color,
+    shape: Shape,
 }
 
 macro_rules! piece_constructor {
@@ -137,6 +137,14 @@ impl Piece {
     piece_constructor!(rook, Rook);
     piece_constructor!(queen, Queen);
     piece_constructor!(king, King);
+
+    pub fn color(&self) -> Color {
+        self.color
+    }
+
+    pub fn shape(&self) -> Shape {
+        self.shape
+    }
 }
 
 impl fmt::Display for Piece {
@@ -147,14 +155,22 @@ impl fmt::Display for Piece {
 
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 pub struct PlacedPiece {
-    pub piece: Piece,
-    pub square: Square,
+    piece: Piece,
+    square: Square,
 }
 
 impl PlacedPiece {
     pub fn new(piece: Piece, square: Square) -> PlacedPiece {
         PlacedPiece { piece, square }
     }
+
+    pub fn piece(&self) -> Piece {
+        self.piece
+    }
+
+    pub fn square(&self) -> Square {
+        self.square
+    }
 }
 
 #[cfg(test)]