Merge pull request #32 from robbiet480/patch-1

Add CaseIterable to OpenGraphMetadata

.travis.yml

@@ -1,5 +1,5 @@
 language: objective-c
-osx_image: xcode9
+osx_image: xcode10
 
 xcode_project: OpenGraph.xcodeproj
 xcode_scheme: OpenGraph
@@ -8,4 +8,4 @@ before_install:
  - carthage bootstrap
 
 script:
- - xcodebuild build-for-testing test-without-building -project OpenGraph.xcodeproj -scheme OpenGraph -configuration Release ENABLE_TESTABILITY=YES
+ - xcodebuild build-for-testing test-without-building -project OpenGraph.xcodeproj -scheme OpenGraph -configuration Release ENABLE_TESTABILITY=YES

OpenGraph/OpenGraphMetadata.swift

@@ -1,6 +1,6 @@
 import Foundation
 
-public enum OpenGraphMetadata: String {
+public enum OpenGraphMetadata: String, CaseIterable {
  // Basic Metadata
  case title
  case type
@@ -62,4 +62,29 @@ public enum OpenGraphMetadata: String {
  case profileLastName = "profile:lastName"
  case profileUsername = "profile:username"
  case profileGender = "profile:gender"
-}
+}
+
+#if !swift(>=4.2)
+public protocol CaseIterable {
+ associatedtype AllCases: Collection where AllCases.Element == Self
+ static var allCases: AllCases { get }
+}
+extension CaseIterable where Self: Hashable {
+ static var allCases: [Self] {
+ return [Self](AnySequence { () -> AnyIterator<Self> in
+ var raw = 0
+ var first: Self?
+ return AnyIterator {
+ let current = withUnsafeBytes(of: &raw) { $0.load(as: Self.self) }
+ if raw == 0 {
+ first = current
+ } else if current == first {
+ return nil
+ }
+ raw += 1
+ return current
+ }
+ })
+ }
+}
+#endif