public override void Initialize()

in src/Microsoft.VisualStudio.SDK.Analyzers/VSSDK006CheckServicesExistAnalyzer.cs [40:63]
23 lines of code
2 McCabe index (conditional complexity)

        public override void Initialize(AnalysisContext context)
        {
            context.EnableConcurrentExecution();
            context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.Analyze);

            context.RegisterCompilationStartAction(start =>
            {
                var state = new CompilationState(
                    Flatten(
                        start.Compilation.GetTypeByMetadataName(Types.Package.FullName)?.GetMembers(Types.Package.GetService),
                        start.Compilation.GetTypeByMetadataName(Types.AsyncPackage.FullName)?.GetMembers(Types.AsyncPackage.GetServiceAsync),
                        start.Compilation.GetTypeByMetadataName(Types.AsyncPackage.FullName)?.GetMembers(Types.Package.GetService),
                        start.Compilation.GetTypeByMetadataName(Types.ServiceProvider.FullName)?.GetMembers(Types.ServiceProvider.GetService),
                        start.Compilation.GetTypeByMetadataName(Types.IServiceProvider.FullName)?.GetMembers(Types.IServiceProvider.GetService),
                        start.Compilation.GetTypeByMetadataName(Types.PackageUtilities.FullName)?.GetMembers(Types.PackageUtilities.QueryService),
                        start.Compilation.GetTypeByMetadataName(Types.IAsyncServiceProvider.FullName)?.GetMembers(Types.IAsyncServiceProvider.GetServiceAsync)),
                    Flatten(
                        start.Compilation.GetTypeByMetadataName(Types.Assumes.FullName)?.GetMembers(Types.Assumes.Present)));
                if (state.ShouldAnalyze)
                {
                    start.RegisterSyntaxNodeAction(Utils.DebuggableWrapper(state.AnalyzeInvocationExpression), SyntaxKind.InvocationExpression);
                }
            });
        }