fsm2 3.2.1

FSM2 provides an implementation of the core design aspects of the UML state diagrams allowing both declarative transitions and dynamic transitions along with Guard Conditions.

example/main.dart

import 'dart:developer';

import 'package:fsm2/fsm2.dart';

void main() async {
  final machine = await StateMachine.create((g) => g
    ..initialState<Solid>()
    ..state<Solid>((b) => b
      ..on<OnMelted, Liquid>(sideEffect: (e) async => log('Melted'))
      ..onEnter((s, e) async => log('Entering $s State'))
      ..onExit((s, e) async => log('Exiting $s State')))
    ..state<Liquid>((b) => b
      ..onEnter((s, e) async => log('Entering $s State'))
      ..onExit((s, e) async => log('Exiting $s State'))
      ..on<OnFroze, Solid>(sideEffect: (e) async => log('Frozen'))
      ..on<OnVaporized, Gas>(sideEffect: (e) async => log('Vaporized')))
    ..state<Gas>((b) => b
      ..onEnter((s, e) async => log('Entering $s State'))
      ..onExit((s, e) async => log('Exiting $s State'))
      ..on<OnCondensed, Liquid>(sideEffect: (e) async => log('Condensed')))
    ..onTransition((from, e, to) => log(
        '''Received Event $e in State ${from!.stateType} transitioning to State ${to!.stateType}''')));
  machine
    ..analyse()
    ..export('test/smcat/water.smcat')
    ..applyEvent(OnMelted())
    ..applyEvent(OnFroze());
}

class Solid implements State {}

class Liquid implements State {}

class Gas implements State {}

class OnMelted implements Event {}

class OnFroze implements Event {}

class OnVaporized implements Event {}

class OnCondensed implements Event {}