Merge pull request #10581 from moiseev/inparameter-4-p3

[swift-4.0-branch-06-23-2017][overlay] Introducing INParameter

Author: tkremenek

stdlib/public/SDK/Intents/CMakeLists.txt

@@ -8,6 +8,7 @@ add_swift_library(swiftIntents ${SWIFT_SDK_OVERLAY_LIBRARY_BUILD_TYPES} IS_SDK_O
   INGetCarLockStatusIntentResponse.swift
   INGetCarPowerLevelStatusIntentResponse.swift
   INIntegerResolutionResult.swift
+  INParameter.swift
   INRequestRideIntent.swift
   INSaveProfileInCarIntent.swift
   INSearchCallHistoryIntent.swift

stdlib/public/SDK/Intents/INParameter.swift

@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+@_exported import Intents
+import Foundation
+
+#if os(iOS) || os(watchOS)
+@available(iOS 11.0, watchOS 4.0, *)
+extension INParameter {
+  @nonobjc
+  public convenience init?<Root, Value>(keyPath: KeyPath<Root, Value>) {
+    if let aClass = Root.self as? AnyClass, let keyPathString = keyPath._kvcKeyPathString {
+      self.init(for: aClass, keyPath: keyPathString)
+    } else {
+      return nil
+    }
+  }
+}
+#endif

test/stdlib/Intents.swift

@@ -21,4 +21,21 @@ if #available(OSX 10.12, iOS 10.0, *) {
   }
 }
 
+#if os(iOS)
+if #available(iOS 11.0, *) {
+
+  IntentsTestSuite.test("INParameter KeyPath") {
+    let param = INParameter(keyPath: \INRequestRideIntent.pickupLocation)
+    expectEqual("pickupLocation", param?.parameterKeyPath)
+    if let typ = param?.parameterClass {
+      expectEqual(INRequestRideIntent.self, typ)
+    }
+    else {
+      expectUnreachable()
+    }
+  }
+}
+
+#endif
+
 runAllTests()