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.

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 @@ namespace ICSharpCode.ILSpyX.Analyzers
 		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);
+				}
+			}
+		}
 	}
 }

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"));
+		}
+	}
+}

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" />