generateForAnnotatedElement method

@override dynamic 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
dynamic generateForAnnotatedElement(
    Element element, ConstantReader annotation, BuildStep buildStep) {
  if (!element.library!.isNonNullableByDefault) {
    throw InvalidGenerationSourceError(
      '$PageCompilerGenerator cannot target libraries that have not been migrated to '
      'null-safety.',
      element: element,
    );
  }

  if (element is! ClassElement) {
    throw InvalidGenerationSourceError(
        '`@$Page` can only be used on classes.',
        element: element);
  }

  try {
    final PageInfo info = PageParser.parse(element, annotation, buildStep);
    _log.info(
        '${info.displayName}{name: ${info.name}, routeName: ${info.routeName}}');
    infos.add(info);
    final PageWriter writer = PageWriter(info);
    writer.generate();
    return writer.toString();
  } on Exception catch (e, s) {
    _log.severe(e);
    _log.severe(s);
    return '// $e \n\n';
  }
}