WIP: reorganization of keypath utilities (in prep for @propertyWrappers)

Sources/KeyPathStringConvertible.swift

@@ -0,0 +1,103 @@
+//
+//  KeyPathStringConvertible.swift
+//  CoreStore
+//
+//  Copyright © 2018 John Rommel Estropia
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//  SOFTWARE.
+//
+
+import Foundation
+import CoreData
+
+
+// MARK: - AnyKeyPathStringConvertible
+
+public protocol AnyKeyPathStringConvertible {
+    
+    /**
+     The keyPath string
+     */
+    var cs_keyPathString: KeyPathString { get }
+}
+
+
+// MARK: - KeyPathStringConvertible
+
+/**
+ Used only for utility methods.
+ */
+public protocol KeyPathStringConvertible: AnyKeyPathStringConvertible {
+    
+    /**
+     The DynamicObject type
+     */
+    associatedtype ObjectType: DynamicObject
+    
+    /**
+     The destination value type
+     */
+    associatedtype DestinationValueType
+}
+
+
+// MARK: - AttributeKeyPathStringConvertible
+
+/**
+ Used only for utility methods.
+ */
+public protocol AttributeKeyPathStringConvertible: KeyPathStringConvertible {
+
+    /**
+     The attribute value type
+     */
+    associatedtype ReturnValueType
+}
+
+
+// MARK: - RelationshipKeyPathStringConvertible
+
+/**
+ Used only for utility methods.
+ */
+public protocol RelationshipKeyPathStringConvertible: KeyPathStringConvertible {
+
+    /**
+     The relationship value type
+     */
+    associatedtype ReturnValueType
+}
+
+
+// MARK: - ToManyRelationshipKeyPathStringConvertible
+
+/**
+ Used only for utility methods.
+ */
+public protocol ToManyRelationshipKeyPathStringConvertible: RelationshipKeyPathStringConvertible where ReturnValueType: Sequence {}
+
+
+// MARK: - Deprecated
+
+@available(*, deprecated, renamed: "AnyKeyPathStringConvertible")
+public typealias AnyDynamicKeyPath = AnyKeyPathStringConvertible
+
+@available(*, deprecated, renamed: "KeyPathStringConvertible")
+public typealias DynamicKeyPath = KeyPathStringConvertible
+