initial code

ProxyInterfaceSourceGenerator Solution.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31512.422
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{ED3DA9DD-1E07-444B-A2D7-2DBA280F96D4}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{2CE637DC-E8F5-4603-8B57-E51A32F631F1}"
+	ProjectSection(SolutionItems) = preProject
+		README.md = README.md
+	EndProjectSection
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tests", "tests", "{19009F5B-3267-45E2-A8B6-89F2AB47D72C}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src-examples", "src-examples", "{38BA087F-EDA1-4F8A-A140-85B84791B815}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ProxyInterfaceSourceGenerator", "src\ProxyInterfaceSourceGenerator\ProxyInterfaceSourceGenerator.csproj", "{C880D4B0-1E9E-4449-AEF8-0A93FB2EDFAD}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ProxyInterfaceConsumer", "src-examples\ProxyInterfaceConsumer\ProxyInterfaceConsumer.csproj", "{7E0A10EE-CCC3-4281-9541-B0AF037D3DF9}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C880D4B0-1E9E-4449-AEF8-0A93FB2EDFAD}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C880D4B0-1E9E-4449-AEF8-0A93FB2EDFAD}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C880D4B0-1E9E-4449-AEF8-0A93FB2EDFAD}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C880D4B0-1E9E-4449-AEF8-0A93FB2EDFAD}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7E0A10EE-CCC3-4281-9541-B0AF037D3DF9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7E0A10EE-CCC3-4281-9541-B0AF037D3DF9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7E0A10EE-CCC3-4281-9541-B0AF037D3DF9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7E0A10EE-CCC3-4281-9541-B0AF037D3DF9}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{C880D4B0-1E9E-4449-AEF8-0A93FB2EDFAD} = {ED3DA9DD-1E07-444B-A2D7-2DBA280F96D4}
+		{7E0A10EE-CCC3-4281-9541-B0AF037D3DF9} = {38BA087F-EDA1-4F8A-A140-85B84791B815}
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {585F071D-051D-441C-9C6B-226D9E15A1F5}
+	EndGlobalSection
+EndGlobal

src-examples/ProxyInterfaceConsumer/IPerson.cs

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+namespace SourceGeneratorInterface
+{
+    [ProxyInterfaceGenerator.Proxy(typeof(SourceGeneratorInterface.Person))]
+    public partial interface IPerson
+    {
+    }
+}

src-examples/ProxyInterfaceConsumer/Person.cs

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+namespace SourceGeneratorInterface
+{
+    public class Person
+    {
+
+        private int PrivateId { get; }
+        public int Id { get; }
+
+        public long? NullableLong { get; }
+
+        public string Name { get; set; }
+
+        public Address Address { get; set; }
+
+        public E E { get; set; }
+
+        public int Add(string s)
+        {
+            return 600;
+        }
+    }
+
+    public class Address
+    {
+        public int X { get; }
+    }
+
+    public enum E
+    {
+        V1,
+        V2
+    }
+}

src-examples/ProxyInterfaceConsumer/Program.cs

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+namespace SourceGeneratorInterface
+{
+    public class Program
+    {
+        public static void Main()
+        {
+            IPerson ip = null;
+            //var i = ip.Id;
+        }
+    }
+}

src-examples/ProxyInterfaceConsumer/ProxyInterfaceConsumer.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+    <OutputType>Exe</OutputType>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.2">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.CodeAnalysis.Common" Version="3.10.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.10.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\ProxyInterfaceSourceGenerator\ProxyInterfaceSourceGenerator.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
+  </ItemGroup>
+
+</Project>

src/ProxyInterfaceSourceGenerator/Extensions/SymbolExtensions.cs

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+using System.Collections.Generic;
+using Microsoft.CodeAnalysis;
+
+namespace ProxyInterfaceSourceGenerator.Extensions
+{
+    internal static class SymbolExtensions
+    {
+        public static string ToCode(this IPropertySymbol property)
+        {
+            string get = property.GetMethod != null ? "get; " : string.Empty;
+            string set = property.SetMethod != null ? "set; " : string.Empty;
+
+            return $"{property.Type} {property.Name} {{ {get}{set}}}";
+        }
+
+        public static string ToCode(this IMethodSymbol method)
+        {
+            var parameters = new List<string>();
+            foreach (var ps in method.Parameters)
+            {
+                parameters.Add($"{ps.Type} {ps.Name}");
+            }
+
+            return $"{method.ReturnType} {method.Name}({string.Join(", ", parameters)});";
+        }
+    }
+}

src/ProxyInterfaceSourceGenerator/FileGenerators/Data.cs

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+namespace ProxyInterfaceSourceGenerator.FileGenerators
+{
+    internal record Data
+    {
+        public string FileName { get; set; }
+
+        public string Text { get; set; }
+    }
+}

src/ProxyInterfaceSourceGenerator/FileGenerators/IFileGenerator.cs

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+namespace ProxyInterfaceSourceGenerator.FileGenerators
+{
+    internal interface IFileGenerator
+    {
+        Data GenerateFile();
+    }
+}

src/ProxyInterfaceSourceGenerator/FileGenerators/IFilesGenerator.cs

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+using System.Collections.Generic;
+
+namespace ProxyInterfaceSourceGenerator.FileGenerators
+{
+    internal interface IFilesGenerator
+    {
+        IEnumerable<Data> GenerateFiles();
+    }
+}

src/ProxyInterfaceSourceGenerator/FileGenerators/PartialInterfacesGenerator.cs

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+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using ProxyInterfaceSourceGenerator.Extensions;
+using ProxyInterfaceSourceGenerator.FileGenerators;
+using ProxyInterfaceSourceGenerator.Utils;
+
+namespace ClassLibrarySourceGen
+{
+    internal class PartialInterfacesGenerator : IFilesGenerator
+    {
+        private readonly GeneratorExecutionContext _context;
+        private readonly IDictionary<InterfaceDeclarationSyntax, string> _candidateInterfaces;
+
+        public PartialInterfacesGenerator(GeneratorExecutionContext context, IDictionary<InterfaceDeclarationSyntax, string> candidateInterfaces)
+        {
+            _context = context;
+            _candidateInterfaces = candidateInterfaces;
+        }
+
+        public IEnumerable<Data> GenerateFiles()
+        {
+            foreach (var x in _candidateInterfaces)
+            {
+                string interfaceName = $"I{x.Value.Split('.').Last()}";
+                yield return new Data
+                {
+                    FileName = $"I{interfaceName}.cs",
+                    Text = CreatePartialInterfaceCode(_context.Compilation.GetTypeByMetadataName(x.Value), interfaceName)
+                };
+            }
+        }
+
+        private string CreatePartialInterfaceCode(INamedTypeSymbol symbol, string interfaceName) => $@"using System;
+
+namespace {symbol.ContainingNamespace}
+{{
+    public partial interface {interfaceName}
+    {{
+{GenerateSimpleProperties(symbol)}
+
+{GenerateMethods(symbol)}
+    }}
+}}";
+
+        private string GenerateSimpleProperties(INamedTypeSymbol symbol)
+        {
+            var str = new StringBuilder();
+            foreach (IPropertySymbol property in MemberHelper.GetPublicProperties(symbol, p => p.Type.IsValueType || p.Type.ToString() == "string"))
+            {
+                str.AppendLine($"        {property.ToCode()}");
+                str.AppendLine();
+            }
+
+            return str.ToString();
+        }
+
+        private string GenerateMethods(INamedTypeSymbol symbol)
+        {
+            var str = new StringBuilder();
+            foreach (IMethodSymbol method in MemberHelper.GetPublicMethods(symbol))
+            {
+                str.AppendLine($"        {method.ToCode()}");
+                str.AppendLine();
+            }
+
+            return str.ToString();
+        }
+    }
+}

src/ProxyInterfaceSourceGenerator/FileGenerators/ProxyAttributeGenerator.cs

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+namespace ProxyInterfaceSourceGenerator.FileGenerators
+{
+    internal class ProxyAttributeGenerator : IFileGenerator
+    {
+        private const string ClassName = "ProxyAttribute";
+
+        public Data GenerateFile()
+        {
+            return new Data
+            {
+                FileName = $"{ClassName}.cs",
+                Text = $@"using System;
+
+namespace ProxyInterfaceGenerator
+{{
+    [AttributeUsage(AttributeTargets.Interface)]
+    public class {ClassName} : Attribute
+    {{
+        public Type Type {{ get; }}
+
+        public {ClassName}(Type type)
+        {{
+            Type = type;
+        }}
+    }}
+}}"
+            };
+        }
+    }
+}

src/ProxyInterfaceSourceGenerator/ProxyInterfaceCodeGenerator.cs

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+using System;
+using System.Diagnostics;
+using System.Text;
+using ClassLibrarySourceGen;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Text;
+using ProxyInterfaceSourceGenerator.FileGenerators;
+
+namespace ProxyInterfaceSourceGenerator
+{
+    [Generator]
+    public class ProxyInterfaceCodeGenerator : ISourceGenerator
+    {
+        private readonly ProxyAttributeGenerator _proxyAttributeGenerator = new ProxyAttributeGenerator();
+
+        public void Initialize(GeneratorInitializationContext context)
+        {
+            if (!Debugger.IsAttached)
+            {
+                Debugger.Launch();
+            }
+
+            context.RegisterForSyntaxNotifications(() => new ProxySyntaxReceiver());
+        }
+        public void Execute(GeneratorExecutionContext context)
+        {
+            var attributeData = _proxyAttributeGenerator.GenerateFile();
+            context.AddSource(attributeData.FileName, SourceText.From(attributeData.Text, Encoding.UTF8));
+
+            if (context.SyntaxReceiver is not ProxySyntaxReceiver receiver)
+            {
+                return;
+            }
+
+            var p = context.Compilation.GetTypeByMetadataName("SourceGeneratorInterface.Person");
+            var ec = context.Compilation.GetTypeByMetadataName("Microsoft.CodeAnalysis.GeneratorExecutionContext");
+
+            var generator = new PartialInterfacesGenerator(context, receiver.CandidateInterfaces);
+
+            foreach (var data in generator.GenerateFiles())
+            {
+                context.AddSource(data.FileName, SourceText.From(data.Text, Encoding.UTF8));
+            }
+        }
+    }
+
+    public struct Test
+    {
+        public int Id { get; set; }
+
+        public Clazz C { get; }
+    }
+
+    public sealed class Clazz
+    {
+        public string Name { get; set; }
+    }
+
+    public interface ITest
+    {
+        int Id { get; set; }
+
+        IClazz C { get; }
+    }
+
+    public interface IClazz
+    {
+        string Name { get; set; }
+    }
+
+    public class TestMock : ITest
+    {
+        private Test _instance;
+
+        private IClazz _clazz;
+
+        public TestMock(Test instance)
+        {
+            _instance = instance;
+
+            _clazz = new ClazzMock(_instance.C);
+        }
+
+        public int Id
+        {
+            get => _instance.Id;
+            set => _instance.Id = value;
+        }
+
+        public IClazz C => _clazz;
+    }
+
+    public class ClazzMock : IClazz
+    {
+        private Clazz _instance;
+
+        public ClazzMock(Clazz instance)
+        {
+            _instance = instance;
+        }
+
+        public string Name
+        {
+            get => _instance.Name;
+            set => _instance.Name = value;
+        }
+    }
+
+    public interface IPrintable
+    {
+        int Length { get; }
+        int Count { get; }
+        void Print1();
+        void Print2();
+    }
+
+    public class PrinterV1 : IPrintable
+    {
+        public int Length => 100;
+        public int Count => 200;
+        public void Print1()
+        {
+            Console.WriteLine("PrinterV1 - Print1");
+        }
+        public void Print2()
+        {
+            Console.WriteLine("PrinterV1 - Print2");
+        }
+    }
+}

src/ProxyInterfaceSourceGenerator/ProxyInterfaceSourceGenerator.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>9</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.2">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.CodeAnalysis.Common" Version="3.10.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.10.0" PrivateAssets="all" />
+  </ItemGroup>
+
+</Project>

src/ProxyInterfaceSourceGenerator/ProxySyntaxReceiver.cs

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+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace ProxyInterfaceSourceGenerator
+{
+    internal class ProxySyntaxReceiver : ISyntaxReceiver
+    {
+        public IDictionary<InterfaceDeclarationSyntax, string> CandidateInterfaces { get; } = new Dictionary<InterfaceDeclarationSyntax, string>();
+
+        public void OnVisitSyntaxNode(SyntaxNode syntaxNode)
+        {
+            if (syntaxNode is InterfaceDeclarationSyntax interfaceDeclarationSyntax && TryGet(interfaceDeclarationSyntax, out string typeName))
+            {
+                CandidateInterfaces.Add(interfaceDeclarationSyntax, typeName);
+            }
+        }
+
+        private static bool TryGet(InterfaceDeclarationSyntax interfaceDeclarationSyntax, out string typeName)
+        {
+            typeName = null;
+
+            // TODO : how to check if the InterfaceDeclarationSyntax has 'partial' ?
+            var attrinbuteLists = interfaceDeclarationSyntax.AttributeLists.FirstOrDefault(x => x.Attributes.Any(a => a.Name.ToString().Equals("ProxyInterfaceGenerator.Proxy")));
+            if (attrinbuteLists == null)
+            {
+                return false;
+            }
+
+            var attributeSyntax = attrinbuteLists.Attributes.FirstOrDefault();
+            if (attributeSyntax == null)
+            {
+                return false;
+            }
+
+            var arg = attributeSyntax.ArgumentList.Arguments.First();
+            typeName = arg.Expression.ChildNodes().First().GetText().ToString();
+            return true;
+        }
+    }
+}

src/ProxyInterfaceSourceGenerator/Utils/MemberHelper.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.CodeAnalysis;
+
+namespace ProxyInterfaceSourceGenerator.Utils
+{
+    internal static class MemberHelper
+    {
+        private static string[] ExcludedMethods = new string[] { "ToString", "GetHashCode" };
+
+        public static IEnumerable<IPropertySymbol> GetPublicProperties(INamedTypeSymbol classSymbol, Func<IPropertySymbol, bool> filter)
+        {
+            return GetPublicMembers(classSymbol, p => p.Kind == SymbolKind.Property, filter);
+        }
+
+        public static IEnumerable<IMethodSymbol> GetPublicMethods(INamedTypeSymbol classSymbol, Func<IMethodSymbol, bool> filter = null)
+        {
+            if (filter == null)
+            {
+                filter = _ => true;
+            }
+
+            return GetPublicMembers(classSymbol,
+                m => m.Kind == SymbolKind.Method,
+                m => m.MethodKind == MethodKind.Ordinary,
+                m => !ExcludedMethods.Contains(m.Name),
+                filter);
+        }
+
+        private static IEnumerable<T> GetPublicMembers<T>(INamedTypeSymbol classSymbol, params Func<T, bool>[] filters) where T : ISymbol
+        {
+            var membersQuery = classSymbol.GetMembers().OfType<T>()
+                .Where(m => m.DeclaredAccessibility == Accessibility.Public);
+
+            foreach (var filter in filters)
+            {
+                membersQuery = membersQuery.Where(filter);
+            }
+
+            var members = membersQuery.ToList();
+
+            var propertyNames = membersQuery.Select(x => x.Name);
+
+            var baseType = classSymbol.BaseType;
+
+            while (baseType != null)
+            {
+                var baseMembers = baseType.GetMembers().OfType<T>()
+                    .Where(m => m.DeclaredAccessibility == Accessibility.Public)
+                    .Where(x => !propertyNames.Contains(x.Name));
+
+                foreach (var filter in filters)
+                {
+                    baseMembers = baseMembers.Where(filter);
+                }
+
+                members.AddRange(baseMembers);
+
+                baseType = baseType.BaseType;
+            }
+
+            return membersQuery;
+        }
+    }
+}