Add IsFileLocal lightup, use it in CA1708

src/NetAnalyzers/Core/Microsoft.CodeQuality.Analyzers/ApiDesignGuidelines/IdentifiersShouldDifferByMoreThanCase.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the MIT license.  See License.txt in the project root for license information.
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the MIT license.  See License.txt in the project root for license information.
 
 using System;
 using System.Collections.Generic;
@@ -54,7 +54,8 @@ private static void AnalyzeCompilation(CompilationAnalysisContext context)
 
             IEnumerable<INamedTypeSymbol> globalTypes = context.Compilation.GlobalNamespace.GetTypeMembers().Where(item =>
                     Equals(item.ContainingAssembly, context.Compilation.Assembly) &&
-                    MatchesConfiguredVisibility(item, context.Options, context.Compilation));
+                    MatchesConfiguredVisibility(item, context.Options, context.Compilation) &&
+                    !item.IsFileLocal());
 
             CheckTypeNames(globalTypes, context);
             CheckNamespaceMembers(globalNamespaces, context);
@@ -97,7 +98,8 @@ private static void CheckNamespaceMembers(IEnumerable<INamespaceSymbol> namespac
                 // Get all the potentially externally visible types in the namespace
                 IEnumerable<INamedTypeSymbol> typeMembers = @namespace.GetTypeMembers().Where(item =>
                     Equals(item.ContainingAssembly, context.Compilation.Assembly) &&
-                    MatchesConfiguredVisibility(item, context.Options, context.Compilation));
+                    MatchesConfiguredVisibility(item, context.Options, context.Compilation) &&
+                    !item.IsFileLocal());
 
                 if (typeMembers.Any())
                 {

src/NetAnalyzers/UnitTests/Microsoft.CodeQuality.Analyzers/ApiDesignGuidelines/IdentifiersShouldDifferByMoreThanCaseTests.cs

@@ -1,9 +1,10 @@
-// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the MIT license.  See License.txt in the project root for license information.
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the MIT license.  See License.txt in the project root for license information.
 
 using System;
 using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.CodeAnalysis.Testing;
+using Test.Utilities;
 using Xunit;
 using VerifyCS = Test.Utilities.CSharpCodeFixVerifier<
     Microsoft.CodeQuality.Analyzers.ApiDesignGuidelines.IdentifiersShouldDifferByMoreThanCaseAnalyzer,
@@ -142,6 +143,56 @@ public partial class F
             }.RunAsync();
         }
 
+        [Fact, WorkItem(6514, "https://github.com/dotnet/roslyn-analyzers/issues/6514")]
+        public async Task FileScopedTypesInNamespaceAsync()
+        {
+            string fileWithClass = """
+                namespace N;
+
+                file class C
+                {
+                }
+                """;
+
+            await new VerifyCS.Test
+            {
+                TestState =
+                {
+                    Sources =
+                    {
+                        fileWithClass,
+                        fileWithClass
+                    }
+                },
+                LanguageVersion = CodeAnalysis.CSharp.LanguageVersion.CSharp11,
+                ReferenceAssemblies = ReferenceAssemblies.Net.Net70
+            }.RunAsync();
+        }
+
+        [Fact, WorkItem(6514, "https://github.com/dotnet/roslyn-analyzers/issues/6514")]
+        public async Task FileScopedTypesGlobalAsync()
+        {
+            string fileWithClass = """
+                file class C
+                {
+                }
+                """;
+
+            await new VerifyCS.Test
+            {
+                TestState =
+                {
+                    Sources =
+                    {
+                        fileWithClass,
+                        fileWithClass
+                    }
+                },
+                LanguageVersion = CodeAnalysis.CSharp.LanguageVersion.CSharp11,
+                ReferenceAssemblies = ReferenceAssemblies.Net.Net70
+            }.RunAsync();
+        }
+
         #endregion
 
         #region Type Level

src/Utilities/Compiler/Extensions/INamedTypeSymbolExtensions.cs

@@ -7,12 +7,18 @@
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
+using Analyzer.Utilities.Lightup;
 using Microsoft.CodeAnalysis;
 
 namespace Analyzer.Utilities.Extensions
 {
     internal static class INamedTypeSymbolExtensions
     {
+
+        private static readonly Func<INamedTypeSymbol, bool> s_isFileLocal = LightupHelpers.CreateSymbolPropertyAccessor<INamedTypeSymbol, bool>(typeof(INamedTypeSymbol), nameof(IsFileLocal), fallbackResult: false);
+
+        public static bool IsFileLocal(this INamedTypeSymbol symbol) => s_isFileLocal(symbol);
+
         public static IEnumerable<INamedTypeSymbol> GetBaseTypesAndThis(this INamedTypeSymbol type)
         {
             INamedTypeSymbol current = type;