rustfst 1.3.0

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

use anyhow::Result;
use serde::{Deserialize, Serialize};

use crate::algorithms::factor_weight::factor_iterators::IdentityFactor;
use crate::algorithms::factor_weight::factor_weight;
use crate::algorithms::factor_weight::{FactorWeightFst, FactorWeightOptions, FactorWeightType};
use crate::fst_impls::VectorFst;
use crate::fst_traits::SerializableFst;
use crate::semirings::SerializableSemiring;
use crate::semirings::WeightQuantize;
use crate::tests_openfst::FstTestData;

use crate::algorithms::fst_convert_from_ref;
use crate::tests_openfst::utils::test_eq_fst;
use std::path::Path;

#[derive(Serialize, Deserialize, Debug)]
pub struct FwIdentityOperationResult {
    factor_final_weights: bool,
    factor_tr_weights: bool,
    result_path: String,
}

pub struct FwIdentityTestData<W, F>
where
    F: SerializableFst<W>,
    W: SerializableSemiring,
{
    pub factor_final_weights: bool,
    pub factor_tr_weights: bool,
    pub result: F,
    w: PhantomData<W>,
}

impl FwIdentityOperationResult {
    pub fn parse<W, F, P>(&self, dir_path: P) -> FwIdentityTestData<W, F>
    where
        F: SerializableFst<W>,
        W: SerializableSemiring,
        P: AsRef<Path>,
    {
        FwIdentityTestData {
            factor_final_weights: self.factor_final_weights,
            factor_tr_weights: self.factor_tr_weights,
            result: F::read(dir_path.as_ref().join(&self.result_path)).unwrap(),
            w: PhantomData,
        }
    }
}

pub fn test_factor_weight_identity<W>(test_data: &FstTestData<W, VectorFst<W>>) -> Result<()>
where
    W: SerializableSemiring + WeightQuantize,
{
    for data in &test_data.factor_weight_identity {
        let mode = FactorWeightType::from_bools(data.factor_final_weights, data.factor_tr_weights);
        let opts = FactorWeightOptions::new(mode);

        let fst_res: VectorFst<_> =
            factor_weight::<_, VectorFst<_>, _, _, IdentityFactor<_>>(&test_data.raw, opts)?;

        test_eq_fst(&data.result, &fst_res,         format!(
            "Factor weight identity failing with factor_final_weights={:?} and factor_tr_weights={:?}",
            data.factor_final_weights, data.factor_tr_weights
        ));
    }

    Ok(())
}

pub fn test_factor_weight_identity_lazy<W>(test_data: &FstTestData<W, VectorFst<W>>) -> Result<()>
where
    W: SerializableSemiring + WeightQuantize,
{
    for data in &test_data.factor_weight_identity {
        let mode = FactorWeightType::from_bools(data.factor_final_weights, data.factor_tr_weights);
        let opts = FactorWeightOptions::new(mode);

        let fst_res_lazy: VectorFst<_> =
            fst_convert_from_ref(&FactorWeightFst::<_, _, _, IdentityFactor<_>>::new(
                test_data.raw.clone(),
                opts,
            )?);

        test_eq_fst(&data.result, &fst_res_lazy, "Factor weight identity lazy");
    }

    Ok(())
}