generateForAnnotatedElement method

@override Future<String> generateForAnnotatedElement(Element element, ConstantReader annotation, BuildStep buildStep)

Implement to return source code to generate for element.

This method is invoked based on finding elements annotated with an instance of T. The annotation is provided as a ConstantReader.

Supported return values include a single String or multiple String instances within an Iterable or Stream. It is also valid to return a Future of String, Iterable, or Stream. When multiple values are returned through an iterable or stream they will be deduplicated. Typically each value will be an independent unit of code and the deduplication prevents re-defining the same member multiple times. For example if multiple annotated elements may need a specific utility method available it can be output for each one, and the single deduplicated definition can be shared.

Implementations should return null when no content is generated. Empty or whitespace-only String instances are also ignored.

Implementation

@override
Future<String> generateForAnnotatedElement(
    Element element, ConstantReader annotation, BuildStep buildStep) async {
  // in case we do have a custom name set, we will find it @ functional widget
  final customName = parseFunctionalWidgetName(annotation);
  // to figure out how to call our class, let's either use customName or
  // the element's name (if available).
  // _checkValidElement will make sure to validate class name in the next step
  final className = _determineClassName(element, customName);
  final function = _checkValidElement(element, className);
  final type = parseFunctionalWidgetAnnotation(annotation);

  final _class = await _makeClassFromFunctionElement(
    function,
    type,
    buildStep,
    className,
  );

  return _class.accept(_emitter).toString();
}