NullableDiagnosticCodeConverter.cs

using System;
using Newtonsoft.Json;
using OmniSharp.Extensions.LanguageServer.Protocol.Models;

namespace OmniSharp.Extensions.LanguageServer.Protocol.Serialization.Converters
{
    class NullableDiagnosticCodeConverter : JsonConverter<DiagnosticCode?>
    {
        public override void WriteJson(JsonWriter writer, DiagnosticCode? value, JsonSerializer serializer)
        {
            if (!value.HasValue)
            {
                writer.WriteNull();
            }
            else
            {
                if (value.Value.IsLong) serializer.Serialize(writer, value.Value.Long);
                if (value.Value.IsString) serializer.Serialize(writer, value.Value.String);
            }
        }

        public override DiagnosticCode? ReadJson(JsonReader reader, Type objectType, DiagnosticCode? existingValue,
            bool hasExistingValue, JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.String)
            {
                return new DiagnosticCode((string) reader.Value);
            }

            if (reader.TokenType == JsonToken.Integer)
            {
                return new DiagnosticCode((long) reader.Value);
            }

            return null;
        }

        public override bool CanRead => true;
    }
}