Add support for decoding PascalCased keywords

Author: mythz

Sources/ServiceStack/Utils.swift

@@ -251,6 +251,13 @@ public class JsonConfig {
         }
         return encoder
     }
+    
+    public static var keywords = [
+        "class", "deinit", "description", "enum", "extension", "func", "import", "init", "let", "protocol", "static",
+        "struct", "subscript", "typealias", "associatedtype", "var", "break", "case", "continue", "default", "do",
+        "else", "fallthrough", "if", "in", "for", "return", "switch", "where", "while", "dynamicType", "is", "new",
+        "super", "self", "didSet", "get", "infix", "inout", "left", "mutating", "none", "nonmutating", "operator",
+        "override", "postfix", "precedence", "prefix", "right", "set", "unowned", "weak", "willSet"]
 
     public static func createDecoder() -> JSONDecoder {
         let decoder = JSONDecoder()
@@ -262,10 +269,13 @@ public class JsonConfig {
             }
             //remove _ prefix from @propertyWrapper properties
             let keyString = lastKey.stringValue
-//            print(keyString)
             if keyString.starts(with: "_") {
                 return AnyKey(stringValue: String(keyString.dropFirst())) ?? lastKey
             }
+            if keywords.contains(keyString) {
+                let useKey = keyString.prefix(1).uppercased() + keyString.dropFirst()
+                return AnyKey(stringValue:useKey) ?? lastKey
+            }
             return lastKey
         }
         decoder.dateDecodingStrategy = .custom({ (decoder) -> Date in

Tests/ServiceStackTests/JsonTests.swift

@@ -83,6 +83,22 @@ class JsonTests: XCTestCase {
 
         XCTAssertEqual("http://test.servicestack.net/json/reply/TestDateTime?dateTime=" + "/Date(978310861000-0000)/".urlEncode()!, url)
     }
+    
+    func test_can_Deserialize_DTO_with_keywords() {
+        let dto = Keywords()
+        dto.name = "name"
+        dto.Description = "description"
+        dto.Is = "is"
+        
+        let json = toJson(dto)
+        XCTAssertEqual(json,"{\"name\":\"name\",\"Is\":\"is\",\"Description\":\"description\"}")
+        
+        let defaultJson = "{\"name\":\"name\",\"is\":\"is\",\"description\":\"description\"}"
+        let defaultDto = fromJson(Keywords.self, defaultJson)!
+        XCTAssertEqual(defaultDto.name, dto.name)
+        XCTAssertEqual(defaultDto.Description, dto.Description)
+        XCTAssertEqual(defaultDto.Is, dto.Is)
+    }
 }
 
 public class TestDateTime: IReturn, Codable {
@@ -91,3 +107,9 @@ public class TestDateTime: IReturn, Codable {
     public required init() {}
     public var dateTime: Date?
 }
+
+public class Keywords : Codable {
+    public var name: String?
+    public var Description: String?
+    public var Is: String?
+}