private bool TryGetReturnTypeBindings()

in sdk/Sdk.Generators/FunctionMetadataProviderGenerator/FunctionMetadataProviderGenerator.Parser.cs [403:454]
45 lines of code
11 McCabe index (conditional complexity)

            private bool TryGetReturnTypeBindings(IMethodSymbol method, bool hasHttpTrigger, bool hasMethodOutputBinding, out IList<IDictionary<string, object>>? bindingsList)
            {
                ITypeSymbol? returnTypeSymbol = method.ReturnType;
                bindingsList = new List<IDictionary<string, object>>();

                if (returnTypeSymbol is null)
                {
                    _context.ReportDiagnostic(Diagnostic.Create(DiagnosticDescriptors.SymbolNotFound, Location.None, nameof(returnTypeSymbol)));
                    bindingsList = null;
                    return false;
                }

                if (!SymbolEqualityComparer.Default.Equals(returnTypeSymbol, _knownTypes.VoidType) &&
                    !SymbolEqualityComparer.Default.Equals(returnTypeSymbol.OriginalDefinition, _knownTypes.TaskType) ||
                    // For HTTP triggers, include the return binding even if the return type is void or Task.
                    hasHttpTrigger)
                {
                    // If there is a Task<T> return type, inspect T, the inner type.
                    if (SymbolEqualityComparer.Default.Equals(returnTypeSymbol.OriginalDefinition, _knownTypes.TaskOfTType))
                    {
                        if (returnTypeSymbol is INamedTypeSymbol namedTypeSymbol)
                        {
                            if (namedTypeSymbol.IsGenericType)
                            {
                                returnTypeSymbol = namedTypeSymbol.TypeArguments.FirstOrDefault();// Generic task should only have one type argument
                            }
                        }

                        if (returnTypeSymbol is null) // need this check here b/c return type symbol takes on a new value from the inner argument type above
                        {
                            _context.ReportDiagnostic(Diagnostic.Create(DiagnosticDescriptors.SymbolNotFound, Location.None, nameof(returnTypeSymbol)));
                            bindingsList = null;
                            return false;
                        }
                    }

                    if (SymbolEqualityComparer.Default.Equals(returnTypeSymbol, _knownFunctionMetadataTypes.HttpResponseData))
                    {
                        bindingsList.Add(GetHttpReturnBinding(Constants.FunctionMetadataBindingProps.ReturnBindingName));
                    }
                    else
                    {
                        if (!TryGetReturnTypePropertyBindings(returnTypeSymbol, hasHttpTrigger, hasMethodOutputBinding, out bindingsList))
                        {
                            bindingsList = null;
                            return false;
                        }
                    }
                }

                return true;
            }