Merge pull request #38 from Linq2GraphQL/add-support-custom-scalars

Add support custom scalars

Author: joadan

src/Linq2GraphQL.Client/Converters/CustomScalarConverter.cs

@@ -0,0 +1,39 @@
+using System.Text.Json.Serialization;
+using System.Text.Json;
+
+
+namespace Linq2GraphQL.Client
+{
+    public class CustomScalar
+    {
+        public string Value { get; set; }
+
+        public override string ToString() => Value;
+    }
+
+    public class CustomScalarConverter<TScalar> : JsonConverter<TScalar>
+        where TScalar : CustomScalar, new()
+    {
+        public override TScalar Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            var value = reader.GetString();
+            if (value is null)
+            {
+                return null;
+            }
+
+            var scalar = new TScalar
+            {
+                Value = value
+            };
+
+            return scalar;
+        }
+
+        public override void Write(Utf8JsonWriter writer, TScalar value, JsonSerializerOptions options)
+        {
+            writer.WriteStringValue(value.Value);
+        }
+
+    }
+}

src/Linq2GraphQL.Client/Converters/EnumConverter.cs

@@ -6,33 +6,6 @@
 
 namespace Linq2GraphQL.Client;
 
-//internal static class Program
-//{
-//    public static void Main(string[] args)
-//    {
-//        string json = JsonSerializer.Serialize(FlagDefinitions.One | FlagDefinitions.Two);
-//        FlagDefinitions flags = JsonSerializer.Deserialize<FlagDefinitions>(json);
-//    }
-//}
-
-//[JsonConverter(typeof(JsonStringEnumMemberConverter))]
-//[Flags]
-//public enum FlagDefinitions
-//{
-//    None = 0x00,
-
-//    [EnumMember(Value = "all values")]
-//    All = One | Two | Three | Four,
-
-//    [EnumMember(Value = "one value")]
-//    One = 0x01,
-//    [EnumMember(Value = "two value")]
-//    Two = 0x02,
-//    [EnumMember(Value = "three value")]
-//    Three = 0x04,
-//    [EnumMember(Value = "four value")]
-//    Four = 0x08,
-//}
 
 public class JsonStringEnumMemberConverter : JsonConverterFactory
 {

src/Linq2GraphQL.Client/Extensions.cs

@@ -12,7 +12,7 @@ internal static bool IsValueTypeOrString(this Type type)
             return false;
         }
 
-        return type.IsValueType || type == typeof(string);
+        return type.IsValueType || type == typeof(string) || type.IsSubclassOf(typeof(CustomScalar)); ;
     }
 
     internal static bool IsListOfPrimitiveTypeOrString(this Type type)

src/Linq2GraphQL.Generator/ClientGenerator.cs

@@ -3,6 +3,7 @@
 using Linq2GraphQL.Generator.Templates.Enum;
 using Linq2GraphQL.Generator.Templates.Interface;
 using Linq2GraphQL.Generator.Templates.Methods;
+using Linq2GraphQL.Generator.Templates.Scalars;
 using System.Net.Http.Headers;
 using System.Net.Http.Json;
 using System.Text.Json;
@@ -145,7 +146,16 @@ public List<FileEntry> Generate(string schemaJson)
             var includeQuery = queryType != null;
             var includeMutation = mutationType != null;
 
-            Console.WriteLine("Generate Client...");
+            Console.WriteLine("Generate Scalars...");
+            foreach (var scalar in schema.GetCustomScalars())
+            {
+                var scalarText = new ScalarTemplate(scalar, namespaceName).TransformText();
+                AddFile("Scalars", scalar.FileName, scalarText);
+
+            }
+
+
+                Console.WriteLine("Generate Client...");
             var templateText = new ClientTemplate(namespaceName, clientName, queryType, mutationType, subscriptionType)
                 .TransformText();
             var fileName = clientName + ".cs";

src/Linq2GraphQL.Generator/GraphQLSchema/Schema.cs

@@ -65,6 +65,12 @@ public List<GraphqlType> GetEnums()
         return GetAllTypesExceptSystemTypes().Where(e => e.Kind == TypeKind.Enum).ToList();
     }
 
+    public List<GraphqlType> GetCustomScalars()
+    {
+        var mappers = Helpers.TypeMapping;
+        return GetAllTypesExceptSystemTypes().Where(e => e.Kind == TypeKind.Scalar && !mappers.ContainsKey(e.Name)).ToList();
+    }
+
     public List<GraphqlType> GetInterfaces()
     {
         return GetAllTypesExceptSystemTypes().Where(e => e.Kind == TypeKind.Interface).ToList();

src/Linq2GraphQL.Generator/Linq2GraphQL.Generator.csproj

@@ -58,6 +58,10 @@
             <Generator>TextTemplatingFilePreprocessor</Generator>
             <LastGenOutput>ClientExtensionsTemplate.cs</LastGenOutput>
         </None>
+        <None Update="Templates\Scalars\ScalarTemplate.tt">
+          <Generator>TextTemplatingFilePreprocessor</Generator>
+          <LastGenOutput>ScalarTemplate.cs</LastGenOutput>
+        </None>
     </ItemGroup>
 
     <ItemGroup>
@@ -105,6 +109,11 @@
             <DesignTime>True</DesignTime>
             <DependentUpon>ClientExtensionsTemplate.tt</DependentUpon>
         </Compile>
+        <Compile Update="Templates\Scalars\ScalarTemplate.cs">
+          <DesignTime>True</DesignTime>
+          <AutoGen>True</AutoGen>
+          <DependentUpon>ScalarTemplate.tt</DependentUpon>
+        </Compile>
     </ItemGroup>
 
     <ItemGroup>