Further work on making examples

src/Directory.Build.props

@@ -53,7 +53,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="stylecop.analyzers" Version="1.2.0-beta.164" PrivateAssets="all" />
+    <PackageReference Include="stylecop.analyzers" Version="1.2.0-beta.205" PrivateAssets="all" />
     <PackageReference Include="Roslynator.Analyzers" Version="3.0.0" PrivateAssets="All" />
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.3.0" PrivateAssets="all" />
   </ItemGroup>

src/ReactiveMarbles.ObservableEvents.Tests/MyForm.cs → src/ReactiveMarbles.ObservableEvents.Example/MyForm.cs

@@ -11,6 +11,8 @@
 
 using Xamarin.Forms;
 
+[assembly: GenerateStaticEventObservablesAttribute(typeof(StaticTest))]
+
 #pragma warning disable
 namespace ReactiveMarbles.ObservableEvents
 {
@@ -24,7 +26,7 @@ public partial class MyForm : Page
         /// </summary>
         public void Test()
         {
-            var events = this.Events().PropertyChanged.Subscribe();
+            this.Events().PropertyChanged.Subscribe();
         }
     }
 
@@ -35,4 +37,9 @@ public MyNoEventsClass()
             this.Events();
         }
     }
+
+    public static class StaticTest
+    {
+        public static event EventHandler? TestChanged;
+    }
 }

src/ReactiveMarbles.ObservableEvents.SourceGenerator/EventGeneratorHook.cs

@@ -48,12 +48,19 @@ public static NullEvents Events<T>(this T eventHost)
         }
     }
 
-    internal static partial class EventsHelper
+    internal class GenerateStaticEventObservablesAttribute : Attribute
     {
-        public static NullEvents Events<T>()
+        /// <summary>
+        /// Initializes a new instance of the <see cref=""GenerateStaticEventObservablesAttribute""/> class.
+        /// </summary>
+        /// <param name=""type"">The static type to generate event observable wrappers for.</param>
+        public GenerateStaticEventObservablesAttribute(Type type)
         {
-            return default(NullEvents);
+            Type = type;
         }
+        
+        /// <summary>Gets the Type to generate the static event observable wrappers for.
+        public Type Type { get; }
     }
 
     internal struct NullEvents
@@ -75,6 +82,7 @@ public void Execute(GeneratorExecutionContext context)
                 return;
             }
 
+            ////Debugger.Launch();
             var compilation = context.Compilation;
             var options = (compilation as CSharpCompilation)?.SyntaxTrees[0].Options as CSharpParseOptions;
             compilation = context.Compilation.AddSyntaxTrees(CSharpSyntaxTree.ParseText(SourceText.From(ExtensionMethodText, Encoding.UTF8), options));
@@ -122,22 +130,16 @@ private static void GenerateEventExtensionMethods(GeneratorExecutionContext cont
             out List<(InvocationExpressionSyntax Invocation, IMethodSymbol Method, INamedTypeSymbol NamedType)> staticNamespaceList)
         {
             var observableGeneratorExtensions = compilation.GetTypeByMetadataName("ReactiveMarbles.ObservableEvents.ObservableGeneratorExtensions");
-            var staticGeneratorHelper = compilation.GetTypeByMetadataName("ReactiveMarbles.ObservableEvents.EventsHelper");
 
             if (observableGeneratorExtensions == null)
             {
                 throw new InvalidOperationException("Cannot find ReactiveMarbles.ObservableEvents.ObservableGeneratorExtensions");
             }
 
-            if (staticGeneratorHelper == null)
-            {
-                throw new InvalidOperationException("Cannot find ReactiveMarbles.ObservableEvents.EventsHelper");
-            }
-
             instanceNamespaceList = new List<(InvocationExpressionSyntax, IMethodSymbol, INamedTypeSymbol)>();
             staticNamespaceList = new List<(InvocationExpressionSyntax, IMethodSymbol, INamedTypeSymbol)>();
 
-            foreach (var invocation in receiver.Candidates)
+            foreach (var invocation in receiver.InstanceCandidates)
             {
                 var semanticModel = compilation.GetSemanticModel(invocation.SyntaxTree);
                 var methodSymbol = semanticModel.GetSymbolInfo(invocation).Symbol as IMethodSymbol;
@@ -147,8 +149,7 @@ out List<(InvocationExpressionSyntax Invocation, IMethodSymbol Method, INamedTyp
                     continue;
                 }
 
-                if (!SymbolEqualityComparer.Default.Equals(methodSymbol.ContainingType, observableGeneratorExtensions) &&
-                    !SymbolEqualityComparer.Default.Equals(methodSymbol.ContainingType, staticGeneratorHelper))
+                if (!SymbolEqualityComparer.Default.Equals(methodSymbol.ContainingType, observableGeneratorExtensions))
                 {
                     continue;
                 }
@@ -168,6 +169,14 @@ out List<(InvocationExpressionSyntax Invocation, IMethodSymbol Method, INamedTyp
                 var list = callingSymbol.IsStatic ? staticNamespaceList : instanceNamespaceList;
                 list.Add((invocation, methodSymbol, callingSymbol));
             }
+
+            Debugger.Launch();
+            foreach (var attribute in receiver.StaticCandidates)
+            {
+                var semanticModel = compilation.GetSemanticModel(attribute.SyntaxTree);
+
+                var attributeSymbol = semanticModel.GetSymbolInfo(attribute.ArgumentList.Arguments[0].Expression).Symbol;
+            }
         }
 
         private static bool GenerateEvents(
@@ -272,18 +281,5 @@ out List<(InvocationExpressionSyntax Invocation, IMethodSymbol Method, INamedTyp
                     XmlSyntaxFactory.GenerateDocumentationString(
                         "<auto-generated />"));
         }
-
-        private class SyntaxReceiver : ISyntaxReceiver
-        {
-            public List<InvocationExpressionSyntax> Candidates { get; } = new List<InvocationExpressionSyntax>();
-
-            public void OnVisitSyntaxNode(SyntaxNode syntaxNode)
-            {
-                if (syntaxNode is InvocationExpressionSyntax invocation)
-                {
-                    Candidates.Add(invocation);
-                }
-            }
-        }
     }
 }

src/ReactiveMarbles.ObservableEvents.SourceGenerator/SyntaxReceiver.cs

@@ -0,0 +1,35 @@
+// Copyright (c) 2020 ReactiveUI Association Inc. All rights reserved.
+// ReactiveUI Association Inc licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for full license information.
+
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+
+namespace ReactiveMarbles.ObservableEvents.SourceGenerator
+{
+    internal class SyntaxReceiver : ISyntaxReceiver
+    {
+        public List<InvocationExpressionSyntax> InstanceCandidates { get; } = new List<InvocationExpressionSyntax>();
+
+        public List<AttributeSyntax> StaticCandidates { get; } = new List<AttributeSyntax>();
+
+        public void OnVisitSyntaxNode(SyntaxNode syntaxNode)
+        {
+            if (syntaxNode is InvocationExpressionSyntax invocation)
+            {
+                InstanceCandidates.Add(invocation);
+            }
+
+            if (syntaxNode is AttributeSyntax attribute && attribute.Name.ToFullString() == "GenerateStaticEventObservablesAttribute")
+            {
+                StaticCandidates.Add(attribute);
+            }
+        }
+    }
+}

src/ReactiveMarbles.ObservableEvents.sln

@@ -3,7 +3,7 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 16
 VisualStudioVersion = 16.0.30503.244
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ReactiveMarbles.ObservableEvents.Test", "ReactiveMarbles.ObservableEvents.Tests\ReactiveMarbles.ObservableEvents.Test.csproj", "{2AF6CBC6-6EE4-4C99-B769-2A777DE6ADFC}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ReactiveMarbles.ObservableEvents.Example", "ReactiveMarbles.ObservableEvents.Example\ReactiveMarbles.ObservableEvents.Example.csproj", "{2AF6CBC6-6EE4-4C99-B769-2A777DE6ADFC}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ReactiveMarbles.ObservableEvents.SourceGenerator", "ReactiveMarbles.ObservableEvents.SourceGenerator\ReactiveMarbles.ObservableEvents.SourceGenerator.csproj", "{611C5578-EBDB-4B10-81D1-E7CBEC52D8FB}"
 EndProject