Work around dotnet/roslyn#7446

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers/Roslyn7446WorkaroundAnalyzer.cs

@@ -0,0 +1,59 @@
+// Copyright (c) Tunnel Vision Laboratories, LLC. All Rights Reserved.
+// Licensed under the Apache License, Version 2.0. See LICENSE in the project root for license information.
+
+namespace StyleCop.Analyzers
+{
+    using System;
+    using System.Collections.Immutable;
+    using System.Reflection;
+    using Microsoft.CodeAnalysis;
+    using Microsoft.CodeAnalysis.Diagnostics;
+
+    [DiagnosticAnalyzer(LanguageNames.CSharp)]
+    internal sealed class Roslyn7446WorkaroundAnalyzer : DiagnosticAnalyzer
+    {
+        /// <summary>
+        /// The ID for diagnostics produced by the <see cref="Roslyn7446WorkaroundAnalyzer"/> analyzer.
+        /// </summary>
+        public const string DiagnosticId = "Roslyn7446WorkaroundAnalyzer";
+        private const string Title = "Roslyn Bug 7446 Workaround";
+        private const string MessageFormat = "Roslyn Bug 7446 Workaround";
+        private const string Description = "Roslyn Bug 7446 Workaround";
+        private const string HelpLink = "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/blob/master/documentation/Roslyn7446WorkaroundAnalyzer.md";
+
+        private static readonly DiagnosticDescriptor Descriptor =
+            new DiagnosticDescriptor(DiagnosticId, Title, MessageFormat, AnalyzerCategory.SpacingRules, DiagnosticSeverity.Warning, AnalyzerConstants.EnabledByDefault, Description, HelpLink, WellKnownDiagnosticTags.NotConfigurable);
+
+        private static readonly Action<CompilationStartAnalysisContext> CompilationStartAction = HandleCompilationStart;
+
+        private static readonly bool CallGetDeclarationDiagnostics;
+
+        static Roslyn7446WorkaroundAnalyzer()
+        {
+            // dotnet/roslyn#7446 was fixed for Roslyn 1.2
+            CallGetDeclarationDiagnostics = typeof(AdditionalText).GetTypeInfo().Assembly.GetName().Version < new Version(1, 2, 0, 0);
+        }
+
+        /// <inheritdoc/>
+        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; } =
+            ImmutableArray.Create(Descriptor);
+
+        /// <inheritdoc/>
+        public override void Initialize(AnalysisContext context)
+        {
+            if (!CallGetDeclarationDiagnostics)
+            {
+                return;
+            }
+
+            context.RegisterCompilationStartAction(CompilationStartAction);
+        }
+
+#pragma warning disable RS1012 // Start action has no registered actions.
+        private static void HandleCompilationStart(CompilationStartAnalysisContext context)
+#pragma warning restore RS1012 // Start action has no registered actions.
+        {
+            context.Compilation.GetDeclarationDiagnostics(context.CancellationToken);
+        }
+    }
+}

StyleCop.Analyzers/StyleCop.Analyzers/StyleCop.Analyzers.csproj

@@ -268,6 +268,7 @@
     <Compile Include="ReadabilityRules\SA1133DoNotCombineAttributes.cs" />
     <Compile Include="ReadabilityRules\SA1134AttributesMustNotShareLine.cs" />
     <Compile Include="ReadabilityRules\SX1101DoNotPrefixLocalMembersWithThis.cs" />
+    <Compile Include="Roslyn7446WorkaroundAnalyzer.cs" />
     <Compile Include="Settings\ObjectModel\DocumentationSettings.cs" />
     <Compile Include="Settings\ObjectModel\EndOfFileHandling.cs" />
     <Compile Include="Settings\ObjectModel\FileNamingConvention.cs" />