From f2437bb0465ed1c7ed7ae25c715680123fbffde6 Mon Sep 17 00:00:00 2001
From: Andreas Weizel <rpinski@awzhome.de>
Date: Sat, 20 Jul 2024 00:34:14 +0200
Subject: [PATCH] Allow to collect analyzers annotated with
 ExportAnalyzerAttribute without MEF

This helps users of ILSpyX not using MEF.
Currently only ILSpyX assembly itself is searched
for annotated analyzer types.
---
 .../Analyzers/ExportAnalyzerAttribute.cs      | 15 +++++++
 .../Analyzers/ExportAnalyzerAttributeTests.cs | 41 +++++++++++++++++++
 ILSpy.Tests/ILSpy.Tests.csproj                |  1 +
 3 files changed, 57 insertions(+)
 create mode 100644 ILSpy.Tests/Analyzers/ExportAnalyzerAttributeTests.cs

diff --git a/ICSharpCode.ILSpyX/Analyzers/ExportAnalyzerAttribute.cs b/ICSharpCode.ILSpyX/Analyzers/ExportAnalyzerAttribute.cs
index fbd4b3a724..2f07859211 100644
--- a/ICSharpCode.ILSpyX/Analyzers/ExportAnalyzerAttribute.cs
+++ b/ICSharpCode.ILSpyX/Analyzers/ExportAnalyzerAttribute.cs
@@ -17,7 +17,10 @@
 // DEALINGS IN THE SOFTWARE.
 
 using System;
+using System.Collections.Generic;
 using System.ComponentModel.Composition;
+using System.Linq;
+using System.Reflection;
 
 namespace ICSharpCode.ILSpyX.Analyzers
 {
@@ -31,5 +34,17 @@ public ExportAnalyzerAttribute() : base("Analyzer", typeof(IAnalyzer))
 		public required string Header { get; init; }
 
 		public int Order { get; set; }
+
+		public static IEnumerable<(ExportAnalyzerAttribute AttributeData, Type AnalyzerType)> GetAnnotatedAnalyzers()
+		{
+			foreach (var type in typeof(ExportAnalyzerAttribute).Assembly.GetTypes())
+			{
+				var exportAnalyzerAttribute = type.GetCustomAttribute(typeof(ExportAnalyzerAttribute), false) as ExportAnalyzerAttribute;
+				if (exportAnalyzerAttribute is not null)
+				{
+					yield return (exportAnalyzerAttribute, type);
+				}
+			}
+		}
 	}
 }
diff --git a/ILSpy.Tests/Analyzers/ExportAnalyzerAttributeTests.cs b/ILSpy.Tests/Analyzers/ExportAnalyzerAttributeTests.cs
new file mode 100644
index 0000000000..6c800da9de
--- /dev/null
+++ b/ILSpy.Tests/Analyzers/ExportAnalyzerAttributeTests.cs
@@ -0,0 +1,41 @@
+// Copyright (c) 2024 Andreas Weizel
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System.Linq;
+
+using ICSharpCode.ILSpyX.Analyzers;
+
+using NUnit.Framework;
+
+namespace ICSharpCode.ILSpy.Tests.Analyzers
+{
+	[TestFixture]
+	public class ExportAnalyzerAttributeTests
+	{
+		[Test]
+		public void CollectAnalyzers()
+		{
+			var analyzerNames = ExportAnalyzerAttribute.GetAnnotatedAnalyzers().Select(analyzer => analyzer.AnalyzerType.Name);
+			Assert.That(analyzerNames.Contains("AttributeAppliedToAnalyzer"));
+			Assert.That(analyzerNames.Contains("EventImplementedByAnalyzer"));
+			Assert.That(analyzerNames.Contains("MethodUsedByAnalyzer"));
+			Assert.That(analyzerNames.Contains("PropertyOverriddenByAnalyzer"));
+			Assert.That(analyzerNames.Contains("TypeInstantiatedByAnalyzer"));
+		}
+	}
+}
diff --git a/ILSpy.Tests/ILSpy.Tests.csproj b/ILSpy.Tests/ILSpy.Tests.csproj
index 17337e7b24..0f44621f67 100644
--- a/ILSpy.Tests/ILSpy.Tests.csproj
+++ b/ILSpy.Tests/ILSpy.Tests.csproj
@@ -34,6 +34,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <Compile Include="Analyzers\ExportAnalyzerAttributeTests.cs" />
     <Compile Include="Analyzers\AnalyzerScopeTests.cs" />
     <Compile Include="Analyzers\MemberImplementsInterfaceAnalyzerTests.cs" />
     <Compile Include="Analyzers\MethodUsesAnalyzerTests.cs" />