Can now initialize board with FEN

Sources/Engine/Board.swift

@@ -102,15 +102,15 @@ public class Board: CustomStringConvertible {
 		return board
 	}
 
-	public private(set) var fen =
-		Fen(fen: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")
+	public private(set) var fen: Fen
 
-	public func setBoard() throws -> Grid {
+	public func setBoard() throws {
 		var file: UInt8 = 1
 		var rank: UInt8 = 8
 		var index: UInt8 = 0
-		var b: Grid = board
+		var b: [Square] = squares
 		for c in fen.placement {
+			let r = (8 - Int(rank)) % 8
 			if c == "/" {
 				rank -= 1
 				file = 0
@@ -124,7 +124,7 @@ public class Board: CustomStringConvertible {
 				let f = file
 				for i in f..<(f + n) {
 					file += 1
-					b[rank, i-1]?.piece = nil
+					b[8*r+Int(i)].piece = nil
 				}
 				file -= 1
 			} else if c.isASCII {
@@ -134,10 +134,18 @@ public class Board: CustomStringConvertible {
 						switch k {
 						case .Pawn:
 							Pawn(color: c, on: .init(file: file, rank: rank))
-						default:
-							Pawn(color: c, on: .init(file: file, rank: rank))
+						case .Knight:
+							Knight(color: c, on: .init(file: file, rank: rank))
+						case .Bishop:
+							Bishop(color: c, on: .init(file: file, rank: rank))
+						case .Rook:
+							Rook(color: c, on: .init(file: file, rank: rank))
+						case .Queen:
+							Queen(color: c, on: .init(file: file, rank: rank))
+						case .King:
+							King(color: c, on: .init(file: file, rank: rank))
 						}
-					b[rank, file-1]?.piece = piece
+					b[8*r+Int(file)-1].piece = piece
 				case .none:
 					throw Fen.FenError.InvalidCharacter(
 						c: String(c), column: index)
@@ -147,12 +155,15 @@ public class Board: CustomStringConvertible {
 			file += 1
 			index += 1
 		}
-
-		return b
+		print(b)
+		squares = b
 	}
 
-	public required init() {
+	public required init(fen: Fen = 
+		.init(fen: "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1")
+	) {
 		var rank: UInt8 = 8
+		self.fen = fen
 		for i in 0...63 {
 			let index = UInt8(i)
 			let square = Square(
@@ -164,6 +175,10 @@ public class Board: CustomStringConvertible {
 				rank -= 1
 			}
 		}
+		do {
+			try setBoard()
+		} catch {
+		}
 	}
 
 	public var description: String {
@@ -195,25 +210,26 @@ public class Board: CustomStringConvertible {
 	}
 }
 
-extension Board.Grid {
-	public subscript(rank: UInt8, file: UInt8) -> Square? {
-		get {
-			guard 1 > rank && rank < 9 && 1 > file && file < 9 else {
-				return nil 
-			}
+// For now useless, learn how to setup properly
+// extension Board.Grid {
+// 	public subscript(rank: UInt8, file: UInt8) -> Square? {
+// 		get {
+// 			guard 1 > rank && rank < 9 && 1 > file && file < 9 else {
+// 				return nil
+// 			}
 
-			return self[(8-Int(rank)) % 8][Int(file) - 1]
-		}
-		set {
-			guard 1 > rank && rank < 9 && 1 > file && file < 9 else {
-				return
-			}
+// 			return self[(8 - Int(rank)) % 8][Int(file) - 1]
+// 		}
+// 		set {
+// 			guard 1 > rank && rank < 9 && 1 > file && file < 9 else {
+// 				return
+// 			}
 
-			guard let n = newValue else {
-				return
-			}
+// 			guard let n = newValue else {
+// 				return
+// 			}
 
-			self[(8-Int(rank)) % 8][Int(file) - 1] = n
-		}
-	}
-}
+// 			self[(8 - Int(rank)) % 8][Int(file) - 1] = n
+// 		}
+// 	}
+// }

Sources/Engine/Pieces/Bishop.swift

@@ -0,0 +1,33 @@
+package class Bishop: Piece {
+	package weak var board: Board?
+	package var kind: Kind = .Bishop
+
+	package var unicodeRepresentation: String {
+		return color == .Black ? "♝" : "♗"
+	}
+	package var color: Color
+
+	package var position: Square.Position
+
+	package var pseudoLegalPositions: [Square.Position] {
+		return []
+	}
+
+	package var legalPositions: [Square.Position] {
+		return pseudoLegalPositions.filter { isLegal(pos: $0) }
+	}
+
+	package func move(dst: Square.Position) -> Bool {
+		return false
+	}
+
+	package func isLegal(pos: Square.Position) -> Bool {
+		return false
+	}
+
+	package init(color: Color, on position: Square.Position) {
+		self.color = color
+		self.position = position
+	}
+
+}

Sources/Engine/Pieces/King.swift

@@ -0,0 +1,33 @@
+package class King: Piece {
+	package weak var board: Board?
+	package var kind: Kind = .King
+
+	package var unicodeRepresentation: String {
+		return color == .Black ? "♛" : "♕"
+	}
+	package var color: Color
+
+	package var position: Square.Position
+
+	package var pseudoLegalPositions: [Square.Position] {
+		return []
+	}
+
+	package var legalPositions: [Square.Position] {
+		return pseudoLegalPositions.filter { isLegal(pos: $0) }
+	}
+
+	package func move(dst: Square.Position) -> Bool {
+		return false
+	}
+
+	package func isLegal(pos: Square.Position) -> Bool {
+		return false
+	}
+
+	package init(color: Color, on position: Square.Position) {
+		self.color = color
+		self.position = position
+	}
+
+}

Sources/Engine/Pieces/Knight.swift

@@ -0,0 +1,33 @@
+package class Knight: Piece {
+	package weak var board: Board?
+	package var kind: Kind = .Knight
+
+	package var unicodeRepresentation: String {
+		return color == .Black ? "♞" : "♘"
+	}
+	package var color: Color
+
+	package var position: Square.Position
+
+	package var pseudoLegalPositions: [Square.Position] {
+		return []
+	}
+
+	package var legalPositions: [Square.Position] {
+		return pseudoLegalPositions.filter { isLegal(pos: $0) }
+	}
+
+	package func move(dst: Square.Position) -> Bool {
+		return false
+	}
+
+	package func isLegal(pos: Square.Position) -> Bool {
+		return false
+	}
+
+	package init(color: Color, on position: Square.Position) {
+		self.color = color
+		self.position = position
+	}
+
+}

Sources/Engine/Pieces/Piece.swift

@@ -12,15 +12,18 @@ public enum Kind: String, CaseIterable {
 		}
 	}
 
-
 	public static subscript(_ c: Character) -> (Self, Color)? {
 		let v = c.uppercased()
 
-		guard v == "N" || (Self.allCases.contains { String($0.rawValue.first!) == v}) else {
+		guard
+			v == "N"
+				|| (Self.allCases.contains { String($0.rawValue.first!) == v })
+		else {
 			return nil
 		}
 
-		let kind: Self = switch v {
+		let kind: Self =
+			switch v {
 			case "P": .Pawn
 			case "N": .Knight
 			case "B": .Bishop
@@ -37,6 +40,7 @@ public enum Kind: String, CaseIterable {
 }
 
 public protocol Piece {
+	var board: Board? { get }
 	var color: Color { get }
 	var unicodeRepresentation: String { get }
 	var kind: Kind { get }

Sources/Engine/Pieces/Queen.swift

@@ -0,0 +1,33 @@
+package class Queen: Piece {
+	package weak var board: Board?
+	package var kind: Kind = .Queen
+
+	package var unicodeRepresentation: String {
+		return color == .Black ? "♛" : "♕"
+	}
+	package var color: Color
+
+	package var position: Square.Position
+
+	package var pseudoLegalPositions: [Square.Position] {
+		return []
+	}
+
+	package var legalPositions: [Square.Position] {
+		return pseudoLegalPositions.filter { isLegal(pos: $0) }
+	}
+
+	package func move(dst: Square.Position) -> Bool {
+		return false
+	}
+
+	package func isLegal(pos: Square.Position) -> Bool {
+		return false
+	}
+
+	package init(color: Color, on position: Square.Position) {
+		self.color = color
+		self.position = position
+	}
+
+}

Sources/Engine/Pieces/Rook.swift

@@ -0,0 +1,33 @@
+package class Rook: Piece {
+	package weak var board: Board?
+	package var kind: Kind = .Rook
+
+	package var unicodeRepresentation: String {
+		return color == .Black ? "♜" : "♖"
+	}
+	package var color: Color
+
+	package var position: Square.Position
+
+	package var pseudoLegalPositions: [Square.Position] {
+		return []
+	}
+
+	package var legalPositions: [Square.Position] {
+		return pseudoLegalPositions.filter { isLegal(pos: $0) }
+	}
+
+	package func move(dst: Square.Position) -> Bool {
+		return false
+	}
+
+	package func isLegal(pos: Square.Position) -> Bool {
+		return false
+	}
+
+	package init(color: Color, on position: Square.Position) {
+		self.color = color
+		self.position = position
+	}
+
+}

Sources/exe/main.swift

@@ -1,5 +1,5 @@
 import Engine
 
 let board = Board()
-print(try! board.setBoard())
+print(board)