private static IEnumerable GetAwaitableTypes()

in src/Microsoft.VisualStudio.Threading.Analyzers/DiagnosticAnalyzerState.cs [99:130]

29 lines of code
12 McCabe index (conditional complexity)


        private static IEnumerable<ITypeSymbol> GetAwaitableTypes(INamespaceOrTypeSymbol namespaceOrTypeSymbol)
        {
            if (namespaceOrTypeSymbol is null || namespaceOrTypeSymbol.DeclaredAccessibility != Accessibility.Public)
            {
                yield break;
            }

            foreach (ISymbol? member in namespaceOrTypeSymbol.GetMembers())
            {
                switch (member)
                {
                    case INamespaceOrTypeSymbol nsOrType:
                        foreach (ITypeSymbol? nested in GetAwaitableTypes(nsOrType))
                        {
                            yield return nested;
                        }

                        break;
                    case IMethodSymbol method:
                        if (method.DeclaredAccessibility == Accessibility.Public &&
                            method.IsExtensionMethod &&
                            method.Name == GetAwaiterMethodName &&
                            !method.Parameters.IsEmpty &&
                            ConformsToAwaiterPattern(method.ReturnType))
                        {
                            yield return method.Parameters[0].Type;
                        }

                        break;
                }
            }
        }