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.

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 {
  log.fine('Running SerializerGenerator');

  if (element.kind != ElementKind.CLASS) {
    throw 'Only classes can be annotated with a @Serializable() annotation.';
  }

  var ctx = await buildContext(element as ClassElement, annotation, buildStep,
      buildStep.resolver, !autoSnakeCaseNames);

  if (ctx == null) {
    log.severe('Invalid builder context');
    throw 'Invalid builder context';
  }

  var serializers = annotation.peek('serializers')?.listValue ?? [];

  if (serializers.isEmpty) {
    log.severe("No Serializers");
    return null;
  }

  // Check if any serializer is recognized
  if (!serializers.any((s) => Serializers.all.contains(s.toIntValue()))) {
    log.severe("No recognizable Serializers");
    return null;
  }

  var lib = Library((b) {
    generateClass(
        serializers.map((s) => s.toIntValue() ?? 0).toList(), ctx, b);
    generateFieldsClass(ctx, b);
  });

  var buf = lib.accept(DartEmitter(useNullSafetySyntax: true));
  return buf.toString();
}