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use std::hash::Hash;
pub type Predicate = fn(ch: char) -> bool;
pub struct Transition<State, Effect>
where State: Eq + PartialEq + Copy,
Effect: Copy
{
pub condition: Option<Predicate>,
pub to: State,
pub effect: Option<Effect>
}
#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
pub struct StatesConnection<State>
where State: Eq + PartialEq + Copy + Hash,
{
pub from: State,
pub to: State
}
impl<State, Effect> Transition<State, Effect>
where State: Eq + PartialEq + Copy,
Effect: Copy
{
pub fn new(to: State, condition: Option<Predicate>, effect: Option<Effect>) -> Self {
Self {
to,
condition,
effect
}
}
pub fn transit(&self, ch: char) -> (Option<State>, Option<Effect>) {
match self.condition {
Some(condition) => {
if condition(ch) {
(Some(self.to), self.effect)
} else {
(None, None)
}
},
None => (Some(self.to), self.effect)
}
}
}
#[derive(Copy, Clone, Debug)]
pub struct StreamData<'a> {
pub string: &'a String,
pub index: usize,
pub character: char
}
pub trait Effector<Effect>
where Effect: Copy
{
fn dispatch(&mut self, effect: Effect, input_data: StreamData);
}