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use crate::semirings::{Semiring, SerializableSemiring};
use crate::{Label, StateId};
/// Structure representing a transition from a state to another state in a FST.
#[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Hash)]
pub struct Arc<W: Semiring> {
/// Input label.
pub ilabel: Label,
/// Output label.
pub olabel: Label,
/// Weight.
pub weight: W,
/// ID of the next state.
pub nextstate: StateId,
}
impl<W: Semiring> Arc<W> {
/// Creates a new Arc.
///
/// # Example
///
/// ```
/// # use rustfst::Arc;
/// # use rustfst::semirings::{TropicalWeight, Semiring};
/// let arc = Arc::<TropicalWeight>::new(0, 1, 1.3, 2);
///
/// assert_eq!(arc.ilabel, 0);
/// assert_eq!(arc.olabel, 1);
/// assert_eq!(arc.weight, TropicalWeight::new(1.3));
/// assert_eq!(arc.nextstate, 2);
///
/// ```
pub fn new<S: Into<W>>(ilabel: Label, olabel: Label, weight: S, nextstate: StateId) -> Self {
Arc {
ilabel,
olabel,
weight: weight.into(),
nextstate,
}
}
/// Updates the values of the attributes of the Arc from another Arc.
///
/// # Example
///
/// ```
/// # use rustfst::Arc;
/// # use rustfst::semirings::{Semiring, TropicalWeight};
/// let mut arc_1 = Arc::<TropicalWeight>::new(0, 1, 1.3, 2);
/// let arc_2 = Arc::new(1, 2, 1.2, 3);
///
/// arc_1.set_value(&arc_2);
///
/// assert_eq!(arc_1, arc_2);
/// ```
#[inline]
pub fn set_value(&mut self, arc: &Arc<W>) {
self.ilabel = arc.ilabel;
self.olabel = arc.olabel;
self.weight = arc.weight.clone();
self.nextstate = arc.nextstate;
}
}
impl<W: SerializableSemiring> Arc<W> {
pub fn arc_type() -> String {
let weight_type = W::weight_type();
if weight_type.as_str() == "tropical" {
"standard".to_string()
} else {
weight_type
}
}
}