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use crate::{
Bound, IntoTokenizer, SentenceBreaker, Text, TextLocality, TextStr, TextToken, Token2,
TokenizerOptions, TokenizerParams, Tokens,
};
use std::collections::BTreeSet;
use text_parsing::{Breaker, Local, Localize, Snip};
use std::sync::Arc;
#[derive(Debug, Clone, Copy)]
pub(crate) struct InnerBound {
pub bytes: Snip,
pub chars: Snip,
pub breaker: Breaker,
pub original: Option<Local<()>>,
}
impl<'t> IntoTokenizer for &'t Text {
type IntoTokens = TextTokens<'t>;
fn into_tokenizer<S: SentenceBreaker>(self, params: TokenizerParams<S>) -> Self::IntoTokens {
TextTokens::new(
InnerText {
buffer: &self.buffer,
localities: self.localities.clone(),
},
self.breakers.clone(),
params,
)
}
}
impl<'t> IntoTokenizer for TextStr<'t> {
type IntoTokens = TextTokens<'t>;
fn into_tokenizer<S: SentenceBreaker>(self, params: TokenizerParams<S>) -> Self::IntoTokens {
TextTokens::new(
InnerText {
buffer: self.buffer,
localities: self.localities.clone(),
},
self.breakers.clone(),
params,
)
}
}
struct InnerText<'t> {
buffer: &'t str,
localities: Arc<Vec<TextLocality>>,
}
pub struct TextTokens<'t> {
text: InnerText<'t>,
bounds: BoundEnum,
current_offset: usize,
current_char_offset: usize,
current_tokens: Option<Tokens<'t>>,
options: BTreeSet<TokenizerOptions>,
next_offset: usize,
next_char_offset: usize,
next_bound: Option<TextToken>,
}
enum BoundEnum {
IntoIter(std::vec::IntoIter<InnerBound>),
Iter {
next: usize,
vec: Arc<Vec<InnerBound>>,
},
}
impl Iterator for BoundEnum {
type Item = InnerBound;
fn next(&mut self) -> Option<Self::Item> {
match self {
BoundEnum::Iter { next, vec } => vec.get(*next).map(|ib| {
*next += 1;
*ib
}),
/*match vec.get(next) {
Some(ib) => {
*next += 1;
Some(std::borrow::Cow::Borrowed(ib))
}
None => None,
},*/
BoundEnum::IntoIter(iter) => iter.next(),
}
}
}
impl<'t> TextTokens<'t> {
pub fn text(&self) -> &'t str {
self.text.buffer
}
}
impl<'t> TextTokens<'t> {
fn new<'q, S: SentenceBreaker>(
text: InnerText<'q>,
breakers: Arc<Vec<InnerBound>>,
params: TokenizerParams<S>,
) -> TextTokens<'q> {
fn btoc(txt: &str) -> Vec<usize> {
let mut v = Vec::with_capacity(txt.len());
v.resize(txt.len(), 0);
let mut max = 0;
for (ci, (bi, c)) in txt.char_indices().enumerate() {
for i in bi..bi + c.len_utf8() {
v[i] = ci;
}
max = ci;
}
v.push(max + 1);
v
}
let mut bounds = None;
if params.options.contains(&TokenizerOptions::WithSentences) {
let mut new_b = Vec::new();
let mut offset = 0;
let mut char_offset = 0;
let cnt = breakers.len();
for ib in breakers.iter() {
let InnerBound {
bytes,
chars,
breaker,
original: _,
} = ib;
if bytes.offset < offset {
continue;
}
match breaker {
Breaker::None | Breaker::Space | Breaker::Line | Breaker::Word => {}
Breaker::Sentence | Breaker::Paragraph | Breaker::Section => {
let txt = &text.buffer[offset..bytes.offset];
//println!("{}",txt);
let btoc = btoc(txt);
for snip in params.sentence_breaker.break_text(txt) {
//println!("{:?} -> {}",snip, offset + snip.offset);
if text.buffer[offset + snip.offset..offset + snip.offset + snip.length]
.trim()
.len()
> 0
{
new_b.push(InnerBound {
bytes: Snip {
offset: offset + snip.offset + snip.length,
length: 0,
},
chars: Snip {
offset: char_offset + btoc[snip.offset + snip.length],
length: 0,
},
breaker: Breaker::Sentence,
original: None,
});
}
}
new_b.pop(); // remove last sentence breaker
}
}
new_b.push(ib.clone());
offset = bytes.offset + bytes.length;
char_offset = chars.offset + chars.length;
//println!("");
}
let txt = &text.buffer[offset..];
for snip in params.sentence_breaker.break_text(txt) {
//println!("{}",txt);
//println!("{:?} -> {}",snip,offset + snip.offset);
if text.buffer[offset + snip.offset..offset + snip.offset + snip.length]
.trim()
.len()
> 0
{
let btoc = btoc(txt);
new_b.push(InnerBound {
bytes: Snip {
offset: offset + snip.offset + snip.length,
length: 0,
},
chars: Snip {
offset: char_offset + btoc[snip.offset + snip.length],
length: 0,
},
breaker: Breaker::Sentence,
original: None,
});
}
}
new_b.pop(); // remove last sentence breaker
if new_b.len() > cnt {
bounds = Some(BoundEnum::IntoIter(new_b.into_iter()));
}
}
let bounds = match bounds {
Some(b) => b,
None => BoundEnum::Iter {
next: 0,
vec: breakers,
},
};
TextTokens {
text,
bounds,
current_offset: 0,
current_char_offset: 0,
current_tokens: None,
options: params.options,
next_offset: 0,
next_char_offset: 0,
next_bound: None,
}
}
}
impl<'t> Iterator for TextTokens<'t> {
type Item = TextToken;
fn next(&mut self) -> Option<Self::Item> {
loop {
match &mut self.current_tokens {
Some(tokens) => match tokens.next() {
Some(local_token) => {
let (local, token) = local_token.into_inner();
let local = local.with_shift(self.current_char_offset, self.current_offset);
let Snip {
offset: first,
length: len,
} = local.chars();
if len > 0 {
let last = first + len - 1;
let original = match len == 1 {
false => match Local::from_segment(
self.text.localities[first].original,
self.text.localities[last].original,
) {
Ok(loc) => loc,
Err(_) => continue,
},
true => self.text.localities[first].original,
};
break Some(TextToken {
locality: local,
original: Some(original),
token: token.into(),
});
}
}
None => {
self.current_tokens = None;
self.current_offset = self.next_offset;
self.current_char_offset = self.next_char_offset;
if let Some(tok) = self.next_bound.take() {
break Some(tok);
}
}
},
None => {
let (txt, next_offset, opt_bound) = match self.bounds.next() {
Some(ib) => {
let InnerBound {
bytes,
chars,
breaker,
original,
} = &ib;
if bytes.offset < self.current_offset {
continue;
}
let txt = &self.text.buffer[self.current_offset..bytes.offset];
let next_offset = bytes.offset + bytes.length;
let next_char_offset = chars.offset + chars.length;
let opt_bound = match match breaker {
Breaker::None | Breaker::Space | Breaker::Line | Breaker::Word => {
None
}
Breaker::Sentence => Some(Bound::Sentence),
Breaker::Paragraph => Some(Bound::Paragraph),
Breaker::Section => Some(Bound::Section),
} {
Some(bound) => Some(TextToken {
locality: ().localize(*chars, *bytes),
original: *original,
token: Token2::Bound(bound),
}),
None => None,
};
(txt, (next_offset, next_char_offset), opt_bound)
}
None => match self.current_offset < self.text.buffer.len() {
true => {
let txt = &self.text.buffer[self.current_offset..];
let next_offset = self.text.buffer.len();
let next_char_offset = self.text.localities.len();
let opt_bound = None;
(txt, (next_offset, next_char_offset), opt_bound)
}
false => break None,
},
};
self.next_offset = next_offset.0;
self.next_char_offset = next_offset.1;
self.next_bound = opt_bound;
self.current_tokens = Some(Tokens::new(txt, &self.options));
}
}
}
}
}