declarative library

Provides support for defining state trees in a declarative fashion.

When defining state and their behavior with this library, DeclarativeStateTreeBuilder captures a description of the resulting state tree that can be used to generate a diagram of the tree, which may be useful for documentation purposes.

class States {
  static final locked = StateKey('locked');
  static final unlocked = StateKey('unlocked');
}

var builder = DeclarativeStateTreeBuilder(initialChild: States.locked)
  ..state(States.locked, (b) {
    b.onMessageValue(Messages.insertCoin, (b) => b.goTo(States.unlocked));
  })
  ..state(States.unlocked, (b) {
    b.onMessageValue(Messages.push, (b) => b.goTo(States.locked),
        messageName: 'push');
  });

 var sb = StringBuffer();
 declBuilder.format(sb, DotFormatter());
 print(sb.toString());