rustfst 0.3.0

Library for constructing, combining, optimizing, and searching weighted finite-state transducers (FSTs).
Documentation 
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use failure::Fallible;

use crate::algorithms::{ArcMapper, FinalArc, MapFinalAction, WeightConverter};
use crate::semirings::Semiring;
use crate::Arc;
use crate::EPS_LABEL;

/// Mapper that converts all output symbols to epsilon.
pub struct OutputEpsilonMapper {}

impl<S: Semiring> ArcMapper<S> for OutputEpsilonMapper {
    fn arc_map(&mut self, arc: &mut Arc<S>) -> Fallible<()> {
        arc.olabel = EPS_LABEL;
        Ok(())
    }

    fn final_arc_map(&mut self, _final_arc: &mut FinalArc<S>) -> Fallible<()> {
        Ok(())
    }

    fn final_action(&self) -> MapFinalAction {
        MapFinalAction::MapNoSuperfinal
    }
}

arc_mapper_to_weight_convert_mapper!(OutputEpsilonMapper);