generateForAnnotatedElement method

@override FutureOr<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
FutureOr<String> generateForAnnotatedElement(
    Element element, ConstantReader annotation, BuildStep buildStep) async {
  if (element is! ClassElement) {
    final name = element.name;
    throw InvalidGenerationSourceError('Generator cannot target `$name`.',
        todo: 'Remove the SheetLocalization annotation from `$name`.',
        element: element);
  }

  if (!element.name.endsWith('Delegate')) {
    final name = element.name;
    throw InvalidGenerationSourceError(
        'Generator for target `$name` should have a name that ends with `Delegate`.',
        todo:
            'Refactor the class name `$name` for a name ending with `Delegate` (example: `${name}Delegate`).',
        element: element);
  }

  /*
  element.allSupertypes.firstWhere(
    (x) =>
        x.getDisplayString(withNullability: false) == 'LocalizationsDelegate',
    orElse: () => throw InvalidGenerationSourceError(
      'Supertype aren\'t valid : [${element.allSupertypes.map((x) => x.getDisplayString(withNullability: false)).join(', ')}].',
      todo:
          'Define only one supertype of type LocalizationsDelegate<LOCALIZATION_CLASS_NAME>.',
      element: element,
    ),
  );*/
  final name = '${element.name.replaceAll('Delegate', '')}Data';
  final docId = annotation.objectValue.getField('docId')!.toStringValue();
  final sheetId = annotation.objectValue.getField('sheetId')!.toStringValue();
  var localizations = await _downloadGoogleSheet(
    docId!,
    sheetId!,
    name,
  );
  final builder = DartLocalizationBuilder();
  final code = StringBuffer();
  code.writeln(builder.build(localizations));
  return code.toString();
}