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use crate::dictionary::extended::{self as ext, Subregion};
use crate::dictionary::*;
pub trait Parse {
type Tally: Eq;
fn value(v : char) -> Option<u8>;
fn tally(s : &str) -> Self::Tally;
fn alphabetical(s : &str) -> String {
s.chars()
.filter(|c| Self::value(*c) == None)
.collect()
}
fn pair<N>(str_klp : &str, normalize : N) -> (String, Self::Tally)
where N : Fn(&str) -> String
{
let normalized = normalize(str_klp);
(Self::alphabetical(&normalized), Self::tally(&normalized))
}
}
impl<'a> Parse for Patterns {
type Tally = Vec<Locus>;
#[inline]
fn value(c : char) -> Option<u8> { c.to_digit(10).map(|n| n as u8) }
fn tally(pattern : &str) -> Self::Tally {
pattern.bytes()
.enumerate()
.filter_map(|(i, b)| Self::value(b as char).map(|v| (i, v)))
.enumerate()
.map(|(j, (i, v))| Locus { index : (i - j) as u8,
value : v, })
.collect()
}
}
impl<'a> Parse for Exceptions {
type Tally = Vec<usize>;
#[inline]
fn value(c : char) -> Option<u8> {
match c {
'-' => Some(2),
_ => None,
}
}
fn tally(exception : &str) -> Self::Tally {
exception.bytes()
.enumerate()
.filter_map(|(i, b)| Self::value(b as char).map(|_| i))
.enumerate()
.map(|(j, i)| i - j)
.collect()
}
}
impl<'a> Parse for ext::Patterns {
type Tally = ext::Tally;
#[inline]
fn value(c : char) -> Option<u8> { c.to_digit(10).map(|n| n as u8) }
fn alphabetical(s : &str) -> String {
match s.find('/') {
None => Patterns::alphabetical(s),
Some(i) => Patterns::alphabetical(&s[.. i]),
}
}
fn tally(pattern : &str) -> Self::Tally {
use std::str::FromStr;
match pattern.find('/') {
None => ext::Tally { standard : Patterns::tally(pattern),
subregion : None, },
Some(i) => {
let err = &["Malformed extended hyphenation pattern: ", pattern].concat();
let (standard, extension) = (&pattern[.. i], &pattern[i + 1 ..]);
let breakpoint = extension.find('=').expect(err);
let sub_pattern_end = extension.find(',').expect(err);
let sub_pattern = &extension[.. sub_pattern_end];
let sub_idxs = &extension[sub_pattern_end + 1 ..];
let dot_offset = if standard.starts_with('.') { 1 } else { 0 };
let (chars_to_op, span) = {
let v : Vec<_> = sub_idxs.split(',')
.map(|s| usize::from_str(s).expect(err))
.collect();
assert!(v.len() == 2,
"Malformed extended hyphenation pattern: {}",
pattern);
(v[0] + dot_offset, v[1])
};
let tally = Patterns::tally(standard);
let alphabetical = Patterns::alphabetical(standard);
let substitution = sub_pattern.chars().filter(|&c| c.is_alphabetic()).collect();
let chars_to_start = chars_to_op.saturating_sub(1);
let start = alphabetical.char_indices()
.nth(chars_to_start)
.expect(err)
.0;
let end = alphabetical.char_indices()
.nth(chars_to_start + span)
.expect(err)
.0;
let index = alphabetical.char_indices().nth(chars_to_op).expect(err).0 as u8;
let (left, right) = (index as usize - start, end - index as usize);
let value = tally.iter()
.find(|&&locus| locus.index == index)
.map(|&locus| locus.value)
.expect(err);
ext::Tally { standard : tally,
subregion : (Locus { index, value },
Subregion { left,
right,
substitution,
breakpoint })
.into(), }
}
}
}
}