rustfst 1.3.0

Library for constructing, combining, optimizing, and searching weighted finite-state transducers (FSTs).
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154

use std::fmt::Debug;
use std::sync::Arc;

use anyhow::Result;

use crate::fst_properties::FstProperties;
use crate::fst_traits::{CoreFst, ExpandedFst, Fst, FstIntoIterator, FstIterator, StateIterator};
use crate::semirings::Semiring;
use crate::{StateId, SymbolTable};

/// Adds an object of type T to an FST.
/// The resulting type is a new FST implementation.
#[derive(Debug, PartialEq, Clone)]
pub struct FstAddOn<F, T> {
    pub(crate) fst: F,
    pub(crate) add_on: T,
}

impl<F, T> FstAddOn<F, T> {
    pub fn new(fst: F, add_on: T) -> Self {
        Self { fst, add_on }
    }

    pub fn fst(&self) -> &F {
        &self.fst
    }

    pub fn fst_mut(&mut self) -> &mut F {
        &mut self.fst
    }

    pub fn add_on(&self) -> &T {
        &self.add_on
    }
}

impl<W: Semiring, F: CoreFst<W>, T> CoreFst<W> for FstAddOn<F, T> {
    type TRS = F::TRS;

    fn start(&self) -> Option<StateId> {
        self.fst.start()
    }

    fn final_weight(&self, state_id: StateId) -> Result<Option<W>> {
        self.fst.final_weight(state_id)
    }

    unsafe fn final_weight_unchecked(&self, state_id: StateId) -> Option<W> {
        self.fst.final_weight_unchecked(state_id)
    }

    fn num_trs(&self, s: StateId) -> Result<usize> {
        self.fst.num_trs(s)
    }

    unsafe fn num_trs_unchecked(&self, s: StateId) -> usize {
        self.fst.num_trs_unchecked(s)
    }

    fn get_trs(&self, state_id: StateId) -> Result<Self::TRS> {
        self.fst.get_trs(state_id)
    }

    unsafe fn get_trs_unchecked(&self, state_id: StateId) -> Self::TRS {
        self.fst.get_trs_unchecked(state_id)
    }

    fn properties(&self) -> FstProperties {
        self.fst.properties()
    }

    fn num_input_epsilons(&self, state: StateId) -> Result<usize> {
        self.fst.num_input_epsilons(state)
    }

    fn num_output_epsilons(&self, state: StateId) -> Result<usize> {
        self.fst.num_output_epsilons(state)
    }
}

impl<'a, F: StateIterator<'a>, T> StateIterator<'a> for FstAddOn<F, T> {
    type Iter = <F as StateIterator<'a>>::Iter;

    fn states_iter(&'a self) -> Self::Iter {
        self.fst.states_iter()
    }
}

impl<'a, W, F, T> FstIterator<'a, W> for FstAddOn<F, T>
where
    W: Semiring + 'a,
    F: FstIterator<'a, W>,
{
    type FstIter = F::FstIter;

    fn fst_iter(&'a self) -> Self::FstIter {
        self.fst.fst_iter()
    }
}

impl<W, F, T: Debug> Fst<W> for FstAddOn<F, T>
where
    W: Semiring,
    F: Fst<W>,
{
    fn input_symbols(&self) -> Option<&Arc<SymbolTable>> {
        self.fst.input_symbols()
    }

    fn output_symbols(&self) -> Option<&Arc<SymbolTable>> {
        self.fst.output_symbols()
    }

    fn set_input_symbols(&mut self, symt: Arc<SymbolTable>) {
        self.fst.set_input_symbols(symt)
    }

    fn set_output_symbols(&mut self, symt: Arc<SymbolTable>) {
        self.fst.set_output_symbols(symt)
    }

    fn take_input_symbols(&mut self) -> Option<Arc<SymbolTable>> {
        self.fst.take_input_symbols()
    }

    fn take_output_symbols(&mut self) -> Option<Arc<SymbolTable>> {
        self.fst.take_output_symbols()
    }
}

impl<W, F, T> ExpandedFst<W> for FstAddOn<F, T>
where
    W: Semiring,
    F: ExpandedFst<W>,
    T: Debug + Clone + PartialEq,
{
    fn num_states(&self) -> usize {
        self.fst.num_states()
    }
}

impl<W, F, T> FstIntoIterator<W> for FstAddOn<F, T>
where
    W: Semiring,
    F: FstIntoIterator<W>,
    T: Debug,
{
    type TrsIter = F::TrsIter;
    type FstIter = F::FstIter;

    fn fst_into_iter(self) -> Self::FstIter {
        self.fst.fst_into_iter()
    }
}