dfa.rs

impl Node {
    fn new(state: State) -> Node {
        Rc::new(RefCell::new(state))
    }

    fn then(self, state: State) {
        let arrow = Arrow::Then(self.clone());
        state.arrows.push(arrow);
        Node::new(state)
    }

    fn until(self, state: State, pred: FnOnce(&S) -> bool) {
        let arrow = Arrow::Until(self.clone(), pred);
        state.arrows.push(arrow)
        self
    }

    fn times(self, state: State, mut n: usize) -> Node {
        node.until(move |_| {
            i -= 1;
            n == 0
        })
    }
}