d4rt 0.0.9

An interpreter and runtime for the Dart language. It allows you to execute Dart code dynamically, bridge native classes, and build advanced scripting or plugin systems in your Dart/Flutter applications

example/d4rt_example.dart

import 'package:d4rt/d4rt.dart';

class User {
  String name;
  int _age;
  User(this.name, this._age);
  User.guest()
      : name = 'Guest',
        _age = 0;

  // ignore: unnecessary_getters_setters
  int get age => _age;
  set age(int v) => _age = v;

  static String staticHello() => 'Hello from static!';

  Future<String> fetchProfile() async => 'Profile of $name';

  String greet({String? prefix}) => '${prefix ?? 'Hi'}, $name!';
}

final userBridge = BridgedClassDefinition(
  nativeType: User,
  name: 'User',
  constructors: {
    '': (visitor, positionalArgs, namedArgs) => User(
          positionalArgs[0] as String,
          positionalArgs[1] as int,
        ),
    'guest': (visitor, positionalArgs, namedArgs) => User.guest(),
  },
  methods: {
    'greet': (visitor, target, positionalArgs, namedArgs) =>
        (target as User).greet(prefix: namedArgs['prefix'] as String?),
    'fetchProfile': (visitor, target, positionalArgs, namedArgs) =>
        (target as User).fetchProfile(), // async supported
  },
  getters: {
    'name': (visitor, target) => (target as User).name,
    'age': (visitor, target) => (target as User).age,
  },
  setters: {
    'age': (visitor, target, value) => (target as User).age = value as int,
  },
  staticMethods: {
    'staticHello': (visitor, positionalArgs, namedArgs) => User.staticHello(),
  },
);

void main() async {
  final interpreter = D4rt();
  interpreter.registerBridgedClass(
      userBridge, 'package:d4rt_example/d4rt_example.dart');

  final code = '''
    import 'package:d4rt_example/d4rt_example.dart';
    main() async {
      var u = User('Alice', 30);
      u.age = 31;
      var greet = u.greet(prefix: 'Hello');
      var profile = await u.fetchProfile();
      var guest = User.guest();
      var staticMsg = User.staticHello();
      return [greet, profile, guest.name, staticMsg];
    }
  ''';

  final result = await interpreter.execute(source: code);
  print(result); // [Hello, Alice!, Profile of Alice, Guest, Hello from static!]
}