Fix support for Nullable (language version 8) (#25)

* Only emit #nullable when nullable is supported (>= 8.0)

* x

* is not

src/ProxyInterfaceSourceGenerator/FileGenerators/BaseGenerator.cs

@@ -8,10 +8,12 @@ namespace ProxyInterfaceSourceGenerator.FileGenerators
     internal abstract class BaseGenerator
     {
         protected readonly Context _context;
+        protected readonly bool _supportsNullable;
 
-        public BaseGenerator(Context context)
+        public BaseGenerator(Context context, bool supportsNullable)
         {
             _context = context;
+            _supportsNullable = supportsNullable;
         }
 
         protected string GetPropertyType(IPropertySymbol property, out bool isReplaced)

src/ProxyInterfaceSourceGenerator/FileGenerators/PartialInterfacesGenerator.cs

@@ -11,8 +11,8 @@ namespace ProxyInterfaceSourceGenerator.FileGenerators
 {
     internal class PartialInterfacesGenerator : BaseGenerator, IFilesGenerator
     {
-        public PartialInterfacesGenerator(Context context) :
-            base(context)
+        public PartialInterfacesGenerator(Context context, bool supportsNullable) :
+            base(context, supportsNullable)
         {
         }
 
@@ -30,7 +30,7 @@ namespace ProxyInterfaceSourceGenerator.FileGenerators
             var interfaceName = targetClassSymbol.ResolveInterfaceNameWithOptionalTypeConstraints(pd.InterfaceName);
 
             var file = new FileData(
-                $"{pd.FileName}.g.cs",
+                $"{targetClassSymbol.GetFileName()}.g.cs",
                 CreatePartialInterfaceCode(pd.Namespace, targetClassSymbol, interfaceName, pd.ProxyAll)
             );
 
@@ -48,7 +48,7 @@ namespace ProxyInterfaceSourceGenerator.FileGenerators
 // </auto-generated>
 //----------------------------------------------------------------------------------------
 
-#nullable enable
+{(_supportsNullable ? "#nullable enable" : string.Empty)}
 using System;
 
 namespace {ns}
@@ -62,7 +62,7 @@ namespace {ns}
 {GenerateEvents(targetClassSymbol)}
     }}
 }}
-#nullable disable";
+{(_supportsNullable ? "#nullable disable" : string.Empty)}";
 
         private string GenerateProperties(INamedTypeSymbol targetClassSymbol, bool proxyAll)
         {

src/ProxyInterfaceSourceGenerator/FileGenerators/ProxyClassesGenerator.cs

@@ -12,7 +12,7 @@ namespace ProxyInterfaceSourceGenerator.FileGenerators
 {
     internal class ProxyClassesGenerator : BaseGenerator, IFilesGenerator
     {
-        public ProxyClassesGenerator(Context context) : base(context)
+        public ProxyClassesGenerator(Context context, bool supportsNullable) : base(context, supportsNullable)
         {
         }
 
@@ -32,7 +32,7 @@ namespace ProxyInterfaceSourceGenerator.FileGenerators
             var constructorName = $"{targetClassSymbol.Name}Proxy";
 
             var file = new FileData(
-                $"{pd.FileName}Proxy.g.cs",
+                $"{targetClassSymbol.GetFileName()}Proxy.g.cs",
                 CreateProxyClassCode(pd.Namespace, targetClassSymbol, interfaceName, className, constructorName)
             );
 
@@ -41,7 +41,12 @@ namespace ProxyInterfaceSourceGenerator.FileGenerators
             return file;
         }
 
-        private string CreateProxyClassCode(string ns, INamedTypeSymbol targetClassSymbol, string interfaceName, string className, string constructorName) => $@"//----------------------------------------------------------------------------------------
+        private string CreateProxyClassCode(
+            string ns,
+            INamedTypeSymbol targetClassSymbol,
+            string interfaceName,
+            string className,
+            string constructorName) => $@"//----------------------------------------------------------------------------------------
 // <auto-generated>
 //     This code was generated by https://github.com/StefH/ProxyInterfaceSourceGenerator.
 //
@@ -50,7 +55,7 @@ namespace ProxyInterfaceSourceGenerator.FileGenerators
 // </auto-generated>
 //----------------------------------------------------------------------------------------
 
-#nullable enable
+{(_supportsNullable ? "#nullable enable" : string.Empty)}
 using System;
 using AutoMapper;
 
@@ -76,7 +81,7 @@ namespace {ns}
 {GeneratePrivateAutoMapper()}
     }}
 }}
-#nullable disable";
+{(_supportsNullable ? "#nullable disable" : string.Empty)}";
         private string GeneratePrivateAutoMapper()
         {
             return _context.ReplacedTypes.Count == 0 ? string.Empty : "        private readonly IMapper _mapper;";