private bool TryGetMethodOutputBinding()

in sdk/Sdk.Generators/FunctionMetadataProviderGenerator/FunctionMetadataProviderGenerator.Parser.cs [132:185]
43 lines of code
8 McCabe index (conditional complexity)

            private bool TryGetMethodOutputBinding(IMethodSymbol method, out bool hasMethodOutputBinding, out GeneratorRetryOptions? retryOptions, out IList<IDictionary<string, object>>? bindingsList)
            {
                var attributes = method!.GetAttributes(); // methodSymbol is not null here because it's checked in IsValidAzureFunction which is called before bindings are collected/created

                AttributeData? outputBindingAttribute = null;
                hasMethodOutputBinding = false;
                retryOptions = null;

                foreach (var attribute in attributes)
                {
                    if (SymbolEqualityComparer.Default.Equals(attribute.AttributeClass?.BaseType, _knownFunctionMetadataTypes.RetryAttribute))
                    {
                        if (TryGetRetryOptionsFromAttribute(attribute, Location.None, out GeneratorRetryOptions? retryOptionsFromAttr))
                        {
                            retryOptions = retryOptionsFromAttr;
                        }
                    }

                    if (SymbolEqualityComparer.Default.Equals(attribute.AttributeClass?.BaseType, _knownFunctionMetadataTypes.OutputBindingAttribute))
                    {
                        // There can only be one method output binding associated with a function. If there is more than one, we return a diagnostic error here.
                        if (hasMethodOutputBinding)
                        {
                            _context.ReportDiagnostic(Diagnostic.Create(DiagnosticDescriptors.MultipleBindingsGroupedTogether, Location.None, new object[] { "Method", method.Name }));
                            bindingsList = null;
                            return false;
                        }

                        outputBindingAttribute = attribute;
                        hasMethodOutputBinding = true;
                    }
                }

                if (outputBindingAttribute != null)
                {
                    if (!TryCreateBindingDictionary(outputBindingAttribute, Constants.FunctionMetadataBindingProps.ReturnBindingName, Location.None, out IDictionary<string, object>? bindings))
                    {
                        bindingsList = null;
                        return false;
                    }

                    bindingsList = new List<IDictionary<string, object>>(capacity: 1)
                    {
                        bindings!
                    };

                    return true;
                }

                // we didn't find any output bindings on the method, but there were no errors
                // so we treat the found bindings as an empty list and return true
                bindingsList = new List<IDictionary<string, object>>();
                return true;
            }