Changed visibility from package to interal

Sources/Engine/Pieces/Rook.swift

@@ -1,31 +1,41 @@
-package class Rook: Piece {
-	package weak var board: Board?
-	package var kind: Kind = .Rook
+internal final class Rook: Piece, LinearMoves {
+	internal weak var board: Board?
+	internal var kind: Kind = .Rook
 
-	package var unicodeRepresentation: String {
+	internal var unicodeRepresentation: String {
 		return color == .Black ? "♜" : "♖"
 	}
-	package var color: Color
+	internal var color: Color
 
-	package var position: Square.Position
+	internal var position: Square.Position
 
-	package var pseudoLegalPositions: [Square.Position] {
-		return []
+	internal var pseudoLegalPositions: [Square.Position] {
+		return getLinearMoves(from: position)
 	}
 
-	package var legalPositions: [Square.Position] {
-		return pseudoLegalPositions.filter { isLegal(pos: $0) }
+	internal var legalPositions: [Square.Position] {
+		return pseudoLegalPositions.filter { isLegal(on: $0) }
 	}
 
-	package func move(dst: Square.Position) -> Bool {
+	internal func move(to dst: Square.Position) -> Bool {
 		return false
 	}
 
-	package func isLegal(pos: Square.Position) -> Bool {
-		return false
+	internal func isLegal(on pos: Square.Position) -> Bool {
+		if let board = board, let s = board[pos] {
+			if let p = s.piece {
+				if p.color == color { return false }
+				if p.kind == .King {
+					// TODO: Notify board of check
+					return false
+				}
+			}
+
+		}
+		return true
 	}
 
-	package init(color: Color, on position: Square.Position) {
+	internal init(color: Color, on position: Square.Position) {
 		self.color = color
 		self.position = position
 	}