normy 0.1.4

Ultra-fast, zero-copy text normalization for Rust NLP pipelines & tokenizers
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
155

use crate::{
    context::Context,
    stage::{Stage, StageError, StaticFusableStage},
};
use smallvec::SmallVec;
use std::{borrow::Cow, iter::FusedIterator, sync::Arc};

pub trait Process {
    fn process<'a>(&self, text: Cow<'a, str>, ctx: &Context) -> Result<Cow<'a, str>, StageError>;
}

pub trait FusablePipeline: Process {
    type Iter<'a, I>: FusedIterator<Item = char> + 'a
    where
        I: FusedIterator<Item = char> + 'a,
        Self: 'a;

    /// Check if any stage in this chain needs to apply
    /// All stages check against original input
    /// If one needs to work all works
    fn any_needs_apply(&self, text: &str, ctx: &Context) -> Result<bool, StageError>;

    fn fused_iter<'a, I>(&'a self, input: I, ctx: &'a Context) -> Self::Iter<'a, I>
    where
        I: FusedIterator<Item = char> + 'a;

    fn process_fused<'a>(
        &'a self,
        text: Cow<'a, str>,
        ctx: &Context,
    ) -> Result<Cow<'a, str>, StageError> {
        if !self.any_needs_apply(&text, ctx)? {
            return Ok(text);
        }
        let mut result = String::with_capacity(text.len());
        result.extend(self.fused_iter(text.chars(), ctx));
        Ok(Cow::Owned(result))
    }
}

pub struct EmptyProcess;

impl Process for EmptyProcess {
    #[inline(always)]
    fn process<'a>(&self, text: Cow<'a, str>, _ctx: &Context) -> Result<Cow<'a, str>, StageError> {
        Ok(text)
    }
}

impl FusablePipeline for EmptyProcess {
    type Iter<'a, I>
        = I
    where
        I: FusedIterator<Item = char> + 'a;

    #[inline(always)]
    fn fused_iter<'a, I>(&'a self, input: I, _ctx: &'a Context) -> Self::Iter<'a, I>
    where
        I: FusedIterator<Item = char> + 'a,
    {
        input
    }

    #[inline(always)]
    fn any_needs_apply(&self, _text: &str, _ctx: &Context) -> Result<bool, StageError> {
        Ok(false)
    }
}

pub struct ChainedProcess<S, P> {
    pub stage: S,
    pub previous: P,
}

// 1. General implementation: Always works for any Stage and Process
impl<S: Stage, P: Process> Process for ChainedProcess<S, P> {
    fn process<'a>(&self, text: Cow<'a, str>, ctx: &Context) -> Result<Cow<'a, str>, StageError> {
        let current = self.previous.process(text, ctx)?;
        if !self.stage.needs_apply(&current, ctx)? {
            return Ok(current);
        }
        self.stage.apply(current, ctx)
    }
}

// Fused implementation: ONLY exists if S is StaticFusable and P is BuildIter
impl<S, P> FusablePipeline for ChainedProcess<S, P>
where
    S: Stage + StaticFusableStage,
    P: FusablePipeline,
{
    type Iter<'a, I>
        = S::Adapter<'a, P::Iter<'a, I>>
    where
        I: FusedIterator<Item = char> + 'a,
        Self: 'a,
        S: 'a,
        P: 'a;

    #[inline]
    fn fused_iter<'a, I>(&'a self, input: I, ctx: &'a Context) -> Self::Iter<'a, I>
    where
        I: FusedIterator<Item = char> + 'a,
        S: 'a,
        P: 'a,
    {
        let prev_iter = self.previous.fused_iter(input, ctx);
        self.stage.static_fused_adapter(prev_iter, ctx)
    }

    #[inline(always)]
    fn any_needs_apply(&self, text: &str, ctx: &Context) -> Result<bool, StageError> {
        // Check previous stages first
        if self.previous.any_needs_apply(text, ctx)? {
            return Ok(true);
        }

        // Check this stage (safe because safe_skip_approximation=true)
        self.stage.needs_apply(text, ctx)
    }
}

#[derive(Default)]
pub struct DynamicProcess {
    pub(crate) stages: SmallVec<[Arc<dyn Stage + Send + Sync>; 12]>,
}

impl DynamicProcess {
    #[inline(always)]
    pub fn new() -> Self {
        Self::default()
    }

    #[inline(always)]
    pub fn push<T: Stage + Send + Sync + 'static>(mut self, stage: T) -> Self {
        self.stages.push(Arc::new(stage));
        self
    }
}

impl Process for DynamicProcess {
    #[inline(always)]
    fn process<'a>(
        &self,
        mut text: Cow<'a, str>,
        ctx: &Context,
    ) -> Result<Cow<'a, str>, StageError> {
        for stage in &self.stages {
            if stage.needs_apply(&text, ctx)? {
                text = stage.apply(text, ctx)?;
            }
        }
        Ok(text)
    }
}