batman

Sources/Engine/Pieces/Piece.swift

@@ -0,0 +1,48 @@
+public enum Kind: String, CaseIterable {
+	case Pawn, Knight, Bishop, Rook, Queen, King
+
+	public var value: Int8 {
+		switch self {
+		case .Pawn: 1
+		case .Bishop: 3
+		case .Knight: 3
+		case .Rook: 5
+		case .Queen: 9
+		case .King: -1
+		}
+	}
+
+
+	public static subscript(_ c: Character) -> (Self, Color)? {
+		let v = c.uppercased()
+
+		guard v == "N" || (Self.allCases.contains { String($0.rawValue.first!) == v}) else {
+			return nil
+		}
+
+		let kind: Self = switch v {
+			case "P": .Pawn
+			case "N": .Knight
+			case "B": .Bishop
+			case "R": .Rook
+			case "Q": .Queen
+			case "K": .King
+			default: .Pawn
+		}
+
+		let color: Color = c.isUppercase ? .White : .Black
+
+		return (kind, color)
+	}
+}
+
+public protocol Piece {
+	var color: Color { get }
+	var unicodeRepresentation: String { get }
+	var kind: Kind { get }
+	var position: Square.Position { get }
+	var pseudoLegalPositions: [Square.Position] { get }
+	var legalPositions: [Square.Position] { get }
+	func move(dst: Square.Position) -> Bool
+	func isLegal(pos: Square.Position) -> Bool
+}