generateForAnnotatedElement method

  1. @override
Future<String> generateForAnnotatedElement(
  1. Element element,
  2. ConstantReader cr,
  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
Future<String> generateForAnnotatedElement(
    Element element, ConstantReader cr, BuildStep buildStep) async {
  if (element is! ClassElement) return '';
  final className = element.name;
  final overlayName = cr.read('methodOverlayName').isNull
      ? element.name
      : cr.read('methodOverlayName').stringValue;
  final nullSafe =
      cr.read('nullSafe').isNull ? true : cr.read('nullSafe').boolValue;

  var fields = element.fields;
  var res =
      'void _\$${overlayName}FromJson($className instance, Map<String, dynamic> json) {\n'
      '${fields.map((s) => 'instance.${s.displayName}=json[\'${s.displayName}\'] ${nullSafe ? 'as ${s.type.getDisplayString(withNullability: nullSafe)}' : ''};').join('\n')}'
      '}\n\n\n'
      'Map<String, dynamic> _\$${overlayName}ToJson($className instance) =>\n'
      '<String, dynamic>{\n${fields.map((s) => '\'${s.displayName}\': instance.${s.displayName},').join('\n')}};';
  return res;
}