[board] Implement some is_shape getters on Piece and PlacedPiece

board/src/piece.rs

@@ -139,6 +139,14 @@ macro_rules! piece_constructor {
     };
 }
 
+macro_rules! is_shape {
+    ($func_name:ident, $shape:ident) => {
+        pub fn $func_name(&self) -> bool {
+            self.shape == Shape::$shape
+        }
+    };
+}
+
 impl Piece {
     pub fn new(color: Color, shape: Shape) -> Piece {
         Piece { color, shape }
@@ -158,6 +166,13 @@ impl Piece {
     pub fn shape(&self) -> Shape {
         self.shape
     }
+
+    is_shape!(is_pawn, Pawn);
+    is_shape!(is_knight, Knight);
+    is_shape!(is_bishop, Bishop);
+    is_shape!(is_rook, Rook);
+    is_shape!(is_queen, Queen);
+    is_shape!(is_king, King);
 }
 
 impl fmt::Display for Piece {
@@ -215,6 +230,14 @@ pub struct PlacedPiece {
     square: Square,
 }
 
+macro_rules! is_shape {
+    ($func_name:ident, $shape:ident) => {
+        pub fn $func_name(&self) -> bool {
+            self.piece().shape == Shape::$shape
+        }
+    };
+}
+
 impl PlacedPiece {
     pub const fn new(piece: Piece, square: Square) -> PlacedPiece {
         PlacedPiece { piece, square }
@@ -239,6 +262,29 @@ impl PlacedPiece {
     pub fn shape(&self) -> Shape {
         self.piece.shape
     }
+
+    is_shape!(is_pawn, Pawn);
+    is_shape!(is_knight, Knight);
+    is_shape!(is_bishop, Bishop);
+    is_shape!(is_rook, Rook);
+    is_shape!(is_queen, Queen);
+    is_shape!(is_king, King);
+
+    pub fn is_kingside_rook(&self) -> bool {
+        self.is_rook()
+            && match self.color() {
+                Color::White => self.square == Square::H1,
+                Color::Black => self.square == Square::H8,
+            }
+    }
+
+    pub fn is_queenside_rook(&self) -> bool {
+        self.is_rook()
+            && match self.color() {
+                Color::White => self.square == Square::A1,
+                Color::Black => self.square == Square::A8,
+            }
+    }
 }
 
 impl fmt::Display for PlacedPiece {