generateForAnnotatedElement method

  1. @override
dynamic generateForAnnotatedElement(
  1. Element element,
  2. ConstantReader annotation,
  3. 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 is! ClassElement) {
    throw InvalidGenerationSourceError(
        'Manifest annotation can only be defined on a class.');
  }

  if (_count > 0) {
    throw InvalidGenerationSourceError(
        'Manifest annotation can only be defined once.');
  }

  _count++;

  _log.info('\n'
      '******************** ${_log.name} ********************\n'
      'Manifest Compiler 暂不支持增量更新\n'
      '如果需要添加/删除/更新路由信息,请先执行清除命令:\n'
      'flutter pub run build_runner clean\n'
      '然后执行下列命令重新生成相应文件:\n'
      'flutter pub run build_runner build --delete-conflicting-outputs\n'
      '******************** ${_log.name} ********************');

  try {
    final ManifestWriter writer = ManifestWriter(element, infos);
    writer.generate();
    return writer.toString();
  } on Exception catch (e, s) {
    _log.severe(e);
    _log.severe(s);
    return '// $e \n\n';
  }
}