Linear + Diagonal moves

Sources/Engine/Pieces/CommonMoves.swift

@@ -1,19 +1,35 @@
-internal protocol DiagonalMoves {
+protocol DiagonalMoves {
     func getDiagonalMoves(from pos: Square.Position) -> [Square.Position]
 }
 
 extension DiagonalMoves {
     func getDiagonalMoves(from pos: Square.Position) -> [Square.Position] {
-        return []
+        var squares = [Square.Position]()
+        for i: (Int8, Int8) in [(1, -1), (1, 1), (-1, 1), (-1, -1)] {
+            var currentSquare = pos + i
+            while currentSquare.index != nil {
+                squares.append(currentSquare)
+                currentSquare += i 
+            }
+        }
+        return squares
     }
 }
 
-internal protocol LinearMoves {
+protocol LinearMoves {
     func getLinearMoves(from pos: Square.Position) -> [Square.Position]
 }
 
 extension LinearMoves {
     func getLinearMoves(from pos: Square.Position) -> [Square.Position] {
-        return []
+        var squares = [Square.Position]()
+        for i: (Int8, Int8) in [(1, 0), (0, 1), (-1, 0), (0, -1)] {
+            var currentSquare = pos + i
+            while currentSquare.index != nil {
+                squares.append(currentSquare)
+                currentSquare += i 
+            }
+        }
+        return squares
     }
 }