generateForAnnotatedElement method

@override Future<String?> generateForAnnotatedElement(Element element, ConstantReader constantReader, 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 constantReader, BuildStep buildStep) async {
  if (element is FunctionElement) {
    return 'const ${element.name}FunctionMirror = ${_renderFunction(element)};';
  }

  if (element is EnumElement) {
    return "const ${element.name}ClassMirror = ClassMirror("
        "name: '${element.name}',"
        "isEnum: true,"
        "values: ${element.name}.values);";
  }

  if (element is ClassElement) {
    var superTypes =
        element.allSupertypes.where((st) => !{'Object', 'SerializableMap', 'Map'}.contains(st.element.name));
    var stAccessors = superTypes.expand((st) => st.accessors);
    var stMethods = superTypes.expand((st) => st.methods);
    var stFields = superTypes.expand((st) => st.element.fields);

    var constructors = element.constructors;
    var className = element.name;

    var elementFields = <FieldElement>[]
      ..addAll(element.fields.toList())
      ..addAll(stFields);
    var fields = _distinctByName(elementFields);

    var accessors = _distinctByName([...element.accessors, ...stAccessors]);
    var getters =
        _distinctByName(accessors.where((a) => a.kind == ElementKind.GETTER));
    var setters =
        _distinctByName(accessors.where((a) => a.kind == ElementKind.SETTER));
    var methods = _distinctByName([...element.methods, ...stMethods]);

    return '''${element.isAbstract ? '' : constructors.map((c) => '_${className}_${c.name}_Constructor([positionalParams, namedParams]) =>'
            '${className}${c.name.isEmpty ? '' : '.${c.name}'}(${_renderConstructorParametersCall(c)});\n').join('')}

${element.fields.map(_renderFieldsDeclarations).join('\n')}

const ${className}ClassMirror = ClassMirror(
name: '${element.name}',
${[
      element.isAbstract
          ? ''
          : '''constructors: {
        ${constructors.map((c) => "'${c.name}': FunctionMirror("
              "name: '${c.name}',"
              "${_renderPositionalParameters(c.parameters)}"
              "${_renderNamedParameters(c.parameters)}"
              "\$call: _${className}_${c.name}_Constructor)").join(',')}
        }''',
      _renderMetadata(element.metadata),
      fields.where((x) => !x.isStatic).isNotEmpty
          ? 'fields: {${fields.where((x) => !x.isStatic).map(_renderFields).join(',')}}'
          : '',
      getters.where((x) => !x.isStatic).isNotEmpty
          ? 'getters: [${getters.where((x) => !x.isStatic).map((g) => "'${_getSerializedNameFromAccessor(g)}'").join(',')}]'
          : '',
      setters.where((x) => !x.isStatic).isNotEmpty
          ? 'setters: [${setters.where((x) => !x.isStatic).map((s) => "'${_getSerializedNameFromAccessor(s)}'").join(',')}]'
          : '',
      methods.where((x) => !x.isStatic).isNotEmpty
          ? 'methods: {${methods.where((x) => !x.isStatic).map(_renderMethods).join(',')}}'
          : '',
      element.isAbstract ? 'isAbstract: true' : '',
      element.supertype?.getDisplayString(withNullability: false) != 'Object'
          ? 'superclass: ${element.supertype?.element.name}'
          : '',
      element.interfaces.isNotEmpty
          ? 'superinterfaces: [${element.interfaces.map((i) => i.element.name).join(',')}]'
          : ''
    ].fold('', _combine)}
);''';
  }
  return null;
}