Dynamic member lookup (via marker protocol)

Sources/DynamicMemberLookup.swift

@@ -0,0 +1,15 @@
+/// Marker protocol so we can know which types support `@dynamicMemberLookup`. Add this to your own types that support
+/// lookup by String.
+public protocol DynamicMemberLookup {
+  /// Get a value for a given `String` key
+  subscript(dynamicMember member: String) -> Any? { get }
+}
+
+public extension DynamicMemberLookup where Self: RawRepresentable {
+  subscript(dynamicMember member: String) -> Any? {
+    switch member {
+    case "rawValue": return rawValue
+    default: return nil
+    }
+  }
+}

Sources/Variable.swift

@@ -110,6 +110,8 @@ public struct Variable: Equatable, Resolvable {
           return object.value(forKey: bit)
         }
       #endif
+    } else if let value = context as? DynamicMemberLookup {
+      return value[dynamicMember: bit]
     } else if let value = context {
       return Mirror(reflecting: value).getValue(for: bit)
     }