Add LocalizedString

Source/Engine/Serialization/JsonConverters.cs

@@ -219,6 +219,75 @@ namespace FlaxEngine.Json
         public override bool CanWriteDiff => true;
     }
 
+    /// <summary>
+    /// Serialize LocalizedString as inlined text is not using localization (Id member is empty).
+    /// </summary>
+    /// <seealso cref="Newtonsoft.Json.JsonConverter" />
+    internal class LocalizedStringConverter : JsonConverter
+    {
+        /// <inheritdoc />
+        public override void WriteJson(JsonWriter writer, object value, Newtonsoft.Json.JsonSerializer serializer)
+        {
+            var str = (LocalizedString)value;
+            if (string.IsNullOrEmpty(str.Id))
+            {
+                writer.WriteValue(str.Value);
+            }
+            else
+            {
+                writer.WriteStartObject();
+                writer.WritePropertyName("Id");
+                writer.WriteValue(str.Id);
+                writer.WritePropertyName("Value");
+                writer.WriteValue(str.Value);
+                writer.WriteEndObject();
+            }
+        }
+
+        /// <inheritdoc />
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, Newtonsoft.Json.JsonSerializer serializer)
+        {
+            var str = existingValue as LocalizedString ?? new LocalizedString();
+            if (reader.TokenType == JsonToken.String)
+            {
+                str.Id = null;
+                str.Value = (string)reader.Value;
+            }
+            else if (reader.TokenType == JsonToken.StartObject)
+            {
+                while (reader.Read())
+                {
+                    switch (reader.TokenType)
+                    {
+                    case JsonToken.PropertyName:
+                    {
+                        var propertyName = (string)reader.Value;
+                        switch (propertyName)
+                        {
+                        case "Id":
+                            str.Id = reader.ReadAsString();
+                            break;
+                        case "Value":
+                            str.Value = reader.ReadAsString();
+                            break;
+                        }
+                        break;
+                    }
+                    case JsonToken.Comment: break;
+                    default: return str;
+                    }
+                }
+            }
+            return str;
+        }
+
+        /// <inheritdoc />
+        public override bool CanConvert(Type objectType)
+        {
+            return objectType == typeof(LocalizedString);
+        }
+    }
+
     /*
     /// <summary>
     /// Serialize Guid values using `N` format