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 {
  final className = (element as ClassElement).name;
  final newClassName = "_\$$className";

  final fields = annotation
      .read("map")
      .mapValue
      .entries
      .map(FieldInfo.fromMapEntry)
      .toList();

  final strBuffer = StringBuffer();

  generatePrefKeysClass(strBuffer, className, fields);

  final notifierEnabled = annotation.read("changeNotifier").boolValue;
  final onlyModifier = annotation.read("onlyModifier").boolValue;
  final toggleMethodForBoolValues =
      annotation.read("toggleMethodForBoolValues").boolValue;

  final classToExtend = annotation.read("classToExtend").stringValue;
  final extendsPart = classToExtend.isEmpty ? "" : "extends $classToExtend ";
  strBuffer.writeln('''
    class $newClassName $extendsPart${notifierEnabled ? "with ChangeNotifier" : ""} implements IEasyPrefs{
      final _helper = SharedPreferencesHelper();
      final _keys = const _PrefKeysFor$className();

      /// if [silent] is true, value changes won't be notified.
      $newClassName({bool silent = false}) {
        if(silent) return;
        _helper.onNotify = onValueChanged;
      }
  ''');

  if (notifierEnabled) {
    strBuffer.writeln('''

      @override
      void onValueChanged(String key) {
        notifyListeners();
      }
    ''');
  }

  for (var e in fields) {
    generateGettersAndSetters(
        strBuffer, e, onlyModifier, toggleMethodForBoolValues);
  }

  strBuffer.write('''
    @override
    void initializeAll(){
      final tmp = _helper.onNotify;
      _helper.onNotify = null;

      ${fields.map((e) => "${e.name} = ${e.name};").join("\n")}

      _helper.onNotify = tmp;
      _helper.onNotify?.call("");
    }

    @override
    bool isTouched(){
      return ${fields.map((e) => "_helper.hasKey(_keys.${e.name})").join("\n  || ")};
    }
  ''');

  generateToStringMethod(strBuffer, fields);

  strBuffer.writeln('}');

  if (annotation.read("providerExtensionMethods").boolValue) {
    generateProviderExtMethods(strBuffer, className);
  }

  return strBuffer.toString();
}