Fix support for setting default flag values

Author: Gerzer

Sources/OnboardingKit/OnboardingEvent.swift

@@ -20,19 +20,6 @@ public protocol OnboardingEventProtocol {
 	/// - Warning: Don’t call this method yourself.
 	func check()
 
-	/// Attempts to set the specified flag to a default value.
-	///
-	/// This method should fail silently if no default value can be inferred.
-	/// - Parameter keyPath: The key path at which to set the default value.
-	/// - Warning: Don’t call this method yourself.
-	func setDefaultValue<Flags, Value>(at keyPath: ReferenceWritableKeyPath<Flags, Value>)
-	
-}
-
-extension OnboardingEventProtocol {
-	
-	public func setDefaultValue<Flags, Value>(at: ReferenceWritableKeyPath<Flags, Value>) { }
-	
 }
 
 /// An event that occurs when all of its constituent conditions are satisfied.
@@ -103,8 +90,10 @@ public final class OnboardingEvent<Flags, Value>: OnboardingEventProtocol where
 			if let keyPath = self.keyPath {
 				self.flags[keyPath: keyPath] = self.value
 			}
-		} else if let keyPath = self.keyPath {
-			self.setDefaultValue(at: keyPath)
+		} else if let keyPath = self.keyPath as? ReferenceWritableKeyPath<Flags, Bool> {
+			self.flags[keyPath: keyPath] = false
+		} else if let keyPath = self.keyPath, let defaultValue = (Value.self as? OptionalProtocol.Type)?.none as? Value {
+			self.flags[keyPath: keyPath] = defaultValue
 		}
 	}
 
@@ -130,16 +119,4 @@ public extension OnboardingEvent where Value == Bool {
 		self.init(flags: flags, settingFlagAt: keyPath, to: true, conditions: conditions)
 	}
 
-	func setDefaultValue(at keyPath: ReferenceWritableKeyPath<Flags, Bool>) {
-		self.flags[keyPath: keyPath] = false
-	}
-	
-}
-
-public extension OnboardingEvent where Value: ExpressibleByNilLiteral {
-	
-	func setDefaultValue(at keyPath: ReferenceWritableKeyPath<Flags, Value>) {
-		self.flags[keyPath: keyPath] = nil
-	}
-	
 }

Sources/OnboardingKit/OptionalProtocol.swift

@@ -0,0 +1,14 @@
+//
+//  OptionalProtocol.swift
+//  OnboardingKit
+//
+//  Created by Gabriel Jacoby-Cooper on 12/23/21.
+//
+
+protocol OptionalProtocol {
+	
+	static var none: Self { get }
+	
+}
+
+extension Optional: OptionalProtocol { }