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use std::borrow::Cow;
use kl_hyphenate_commons::dictionary::*;
use kl_hyphenate_commons::dictionary::extended::*;
use case_folding::{realign, refold, Shift};
use score::Score;
pub fn soft_hyphen_indices(word : &str) -> Option<Vec<usize>> {
let shys : Vec<_> = word.match_indices('\u{00ad}').map(|(i, _)| i).collect();
if shys.len() > 0 {
Some(shys)
} else { None }
}
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub struct Word<'t, Break> {
pub text : &'t str,
pub breaks : Vec<Break>
}
pub trait Hyphenator<'h> {
type Opportunity;
type Exact;
fn hyphenate<'t>(&'h self, word : &'t str) -> Word<'t, Self::Opportunity>;
fn opportunities(&'h self, lowercase_word : &str) -> Vec<Self::Opportunity> {
match self.boundaries(lowercase_word) {
None => vec![],
Some(mins) => {
match self.exact_within(lowercase_word, mins) {
None => self.opportunities_within(lowercase_word, mins),
Some(known) => known
}
}
}
}
fn opportunities_within(&'h self, lowercase_word : &str, bounds : (usize, usize))
-> Vec<Self::Opportunity>;
fn exact_within(&'h self, lowercase_word : &str, bounds : (usize, usize))
-> Option<Vec<Self::Opportunity>>;
fn add_exact(&mut self, word : String, ops : Vec<Self::Exact>) -> Option<Vec<Self::Exact>>;
fn unbreakable_chars(&self) -> (usize, usize);
fn boundaries(&self, word : &str) -> Option<(usize, usize)> {
let (l_min, r_min) = self.unbreakable_chars();
let length_min = l_min + r_min;
if word.chars().count() >= length_min {
( word.char_indices().nth(l_min).unwrap().0
, word.char_indices().rev().nth(r_min.saturating_sub(1)).unwrap().0 ).into()
} else { None }
}
}
#[derive(Debug, Clone)]
struct Prepared<'t> {
word : Cow<'t, str>,
shifts : Vec<Shift>
}
fn prepare<'t>(text : &'t str) -> Prepared<'t> {
let (word, shifts) = refold(text);
Prepared { word, shifts }
}
impl<'h> Hyphenator<'h> for Standard {
type Opportunity = usize;
type Exact = usize;
fn hyphenate<'t>(&'h self, word : &'t str) -> Word<'t, Self::Opportunity> {
let breaks = match soft_hyphen_indices(word) {
Some(ops) => ops,
None => {
let Prepared { ref word, ref shifts } = prepare(word);
if shifts.len() > 0 {
self.opportunities(word).into_iter()
.map(move |o| realign(o, shifts)).collect()
} else { self.opportunities(word) }
}
};
Word { breaks, text : word }
}
fn opportunities_within(&'h self, word : &str, (l, r) : (usize, usize)) -> Vec<usize> {
(1 .. word.len())
.zip(self.score(word))
.filter(|&(i, v)| {
let valid = Self::denotes_opportunity(v);
let within_bounds = i >= l && i <= r;
let legal_index = word.is_char_boundary(i);
valid && within_bounds && legal_index
}).map(|(i, _)| i).collect()
}
#[inline]
fn exact_within(&'h self, w : &str, (l, r) : (usize, usize)) -> Option<Vec<Self::Opportunity>> {
self.exceptions.0.get(w).map(|v| v.iter().filter(|&i| *i >= l && *i <= r).cloned().collect())
}
#[inline]
fn add_exact(&mut self, w : String, ops : Vec<usize>) -> Option<Vec<usize>> {
self.exceptions.0.insert(w, ops)
}
#[inline] fn unbreakable_chars(&self) -> (usize, usize) { self.minima }
}
impl<'h> Hyphenator<'h> for Extended {
type Opportunity = (usize, Option<&'h Subregion>);
type Exact = (usize, Option<Subregion>);
fn hyphenate<'t>(&'h self, word : &'t str) -> Word<'t, Self::Opportunity> {
let breaks = match soft_hyphen_indices(word) {
Some(ops) => ops.into_iter().map(|i| (i, None)).collect(),
None => {
let Prepared { ref word, ref shifts } = prepare(word);
if shifts.len() > 0 {
self.opportunities(word).into_iter()
.map(move |(i, subr)| (realign(i, shifts), subr)).collect()
} else { self.opportunities(word) }
}
};
Word { breaks, text : word }
}
fn opportunities_within(&'h self, word : &str, (l, r) : (usize, usize))
-> Vec<Self::Opportunity>
{
(1 .. word.len())
.zip(self.score(word))
.filter(|&(i, v)| {
let valid = Self::denotes_opportunity(v);
let within_bounds = i >= l && i <= r;
let legal_index = word.is_char_boundary(i);
valid && within_bounds && legal_index
}).map(|(i, (_, subr))| (i, subr)).collect()
}
#[inline]
fn exact_within(&'h self, w : &str, (l, r) : (usize, usize)) -> Option<Vec<Self::Opportunity>> {
self.exceptions.0.get(w).map(|v| v.iter()
.filter_map(|&(i, ref sub)| if i >= l && i <= r { Some((i, sub.as_ref())) } else { None }).collect())
}
#[inline]
fn add_exact(&mut self, w : String, ops : Vec<Self::Exact>) -> Option<Vec<Self::Exact>> {
self.exceptions.0.insert(w, ops)
}
#[inline] fn unbreakable_chars(&self) -> (usize, usize) { self.minima }
}