Dactyloidae iOS initial commit

mobile/ios/Shared/Extensions/JSONExtensions.swift

@@ -0,0 +1,65 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Foundation
+import SwiftyJSON
+
+public extension JSON {
+    func isStringOrNull() -> Bool {
+        return self.isString() ||
+               self.isNull()
+    }
+
+    func isError() -> Bool {
+        return self.error != nil
+    }
+
+    func isString() -> Bool {
+        // SwiftyJSON doesn't link values to types; it's possible for `self.type == .string` but
+        // `self.string` to return `nil`. Validate both.
+        return self.type == .string &&
+               self.string != nil
+    }
+
+    func isBool() -> Bool {
+        return self.type == .bool
+    }
+
+    func isArray() -> Bool {
+        return self.type == .array
+    }
+
+    func isDictionary() -> Bool {
+        return self.type == .dictionary
+    }
+
+    // Bear in mind that for this function to work you need to set the value to NSNull:
+    // ```
+    // var myObj = JSON(…)
+    // myObj["foo"] = someOptional ?? NSNull()
+    // ```
+    // This is… easy to get wrong.
+    func isNull() -> Bool {
+        return self.type == .null
+    }
+
+    func isInt() -> Bool {
+        return self.type == .number && self.int != nil
+    }
+
+    func isNumber() -> Bool {
+        return self.type == .number && self.number != nil
+    }
+
+    func isDouble() -> Bool {
+        return self.type == .number && self.double != nil
+    }
+
+    // SwiftyJSON pretty prints the string value by default. Since all of our
+    // existing code required the string to not be pretty printed, this helper
+    // can be used as a shorthand for non-pretty printed strings.
+    func stringValue() -> String? {
+        return self.rawString(.utf8, options: [])
+    }
+}