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use std::iter::once;
use unicode_normalization::{is_nfkd_quick, UnicodeNormalization};
use super::{CharNormalizer, CharOrStr};
use crate::Token;
/// A global [`Normalizer`] normalizing to the Unicode Normalization Form KD.
///
/// This Normalizer uses [`unicode-normalization::nfkd`] internally to normalize the provided token.
///
/// The Unicode Normalization Form KD (NFKD) is the Compatibility Decomposition normalization, see
/// <https://www.unicode.org/reports/tr15/#Norm_Forms> for more information.
pub struct CompatibilityDecompositionNormalizer;
impl CharNormalizer for CompatibilityDecompositionNormalizer {
fn normalize_char(&self, c: char) -> Option<CharOrStr> {
let mut normalized = c.nfkd();
// if the original character is converted in exactly one character,
// then we return the character directly instead of creating a string for it.
match (normalized.next(), normalized.next()) {
(Some(c), None) => Some(c.into()),
(Some(first), Some(second)) => {
let normalized: String =
once(first).chain(once(second)).chain(normalized).collect();
Some(normalized.into())
}
(None, _) => None,
}
}
fn should_normalize(&self, token: &Token) -> bool {
!(token.lemma().is_ascii()
|| matches!(
is_nfkd_quick(token.lemma().chars()),
unicode_normalization::IsNormalized::Yes
))
}
}
// Test the normalizer:
#[cfg(test)]
mod test {
use std::borrow::Cow::Owned;
use crate::normalizer::test::test_normalizer;
use crate::normalizer::{Normalizer, NormalizerOption};
use crate::token::TokenKind;
use crate::{Language, Script};
// base tokens to normalize.
fn tokens() -> Vec<Token<'static>> {
vec![
Token {
// Decompose 1E69 to 0073 0323 0307
lemma: Owned("ṩ ṩ".to_string()),
char_end: 2,
byte_end: 2,
script: Script::Latin,
..Default::default()
},
Token {
lemma: Owned("ｶﾞｷﾞｸﾞｹﾞｺﾞ".to_string()),
char_end: "ｶﾞｷﾞｸﾞｹﾞｺﾞ".chars().count(),
byte_end: "ｶﾞｷﾞｸﾞｹﾞｺﾞ".len(),
script: Script::Cj,
language: Some(Language::Jpn),
..Default::default()
},
]
}
// expected result of the current Normalizer.
fn normalizer_result() -> Vec<Token<'static>> {
vec![
Token {
lemma: Owned("s\u{0323}\u{0307} s\u{0323}\u{0307}".to_string()),
char_end: 2,
byte_end: 2,
char_map: Some(vec![(3, 5), (1, 1), (3, 5)]),
script: Script::Latin,
..Default::default()
},
Token {
lemma: Owned("カ\u{3099}キ\u{3099}ク\u{3099}ケ\u{3099}コ\u{3099}".to_string()),
char_end: "ｶﾞｷﾞｸﾞｹﾞｺﾞ".chars().count(),
byte_end: "ｶﾞｷﾞｸﾞｹﾞｺﾞ".len(),
script: Script::Cj,
char_map: Some(vec![
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
]),
language: Some(Language::Jpn),
..Default::default()
},
]
}
// expected result of the complete Normalizer pieline.
fn normalized_tokens() -> Vec<Token<'static>> {
vec![
Token {
lemma: Owned("s s".to_string()),
char_end: 2,
byte_end: 2,
script: Script::Latin,
char_map: Some(vec![(3, 1), (1, 1), (3, 1)]),
kind: TokenKind::Word,
..Default::default()
},
Token {
#[cfg(feature = "japanese-transliteration")]
lemma: Owned("か\u{3099}き\u{3099}く\u{3099}け\u{3099}こ\u{3099}".to_string()),
#[cfg(not(feature = "japanese-transliteration"))]
lemma: Owned("カ\u{3099}キ\u{3099}ク\u{3099}ケ\u{3099}コ\u{3099}".to_string()),
char_end: "ｶﾞｷﾞｸﾞｹﾞｺﾞ".chars().count(),
byte_end: "ｶﾞｷﾞｸﾞｹﾞｺﾞ".len(),
script: Script::Cj,
language: Some(Language::Jpn),
char_map: Some(vec![
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
]),
kind: TokenKind::Word,
..Default::default()
},
]
}
test_normalizer!(
CompatibilityDecompositionNormalizer,
tokens(),
normalizer_result(),
normalized_tokens()
);
}