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use super::CharNormalizer;
use crate::normalizer::CharOrStr;
use crate::Token;
/// A global [`Normalizer`] removing control characters.
///
pub struct ControlCharNormalizer;
impl CharNormalizer for ControlCharNormalizer {
fn normalize_char(&self, c: char) -> Option<CharOrStr> {
(!is_control(c)).then(|| c.into())
}
fn should_normalize(&self, token: &Token) -> bool {
token.lemma().chars().any(is_control)
}
}
fn is_control(c: char) -> bool {
c.is_control() && !c.is_whitespace()
}
#[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::Script;
// base tokens to normalize.
fn tokens() -> Vec<Token<'static>> {
vec![
Token {
lemma: Owned("\0生而自由\u{2}oo\0".to_string()),
char_end: 9,
byte_end: 17,
script: Script::Cj,
..Default::default()
},
Token {
lemma: Owned("\0生而自由\u{2}oo\0".to_string()),
char_end: 9,
byte_end: 17,
script: Script::Cj,
char_map: Some(vec![
(1, 1),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(1, 1),
(1, 1),
(1, 1),
(1, 1),
]),
..Default::default()
},
]
}
// expected result of the current Normalizer.
fn normalizer_result() -> Vec<Token<'static>> {
vec![
Token {
lemma: Owned("生而自由oo".to_string()),
char_end: 9,
byte_end: 17,
script: Script::Cj,
char_map: Some(vec![
(1, 0),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(1, 0),
(1, 1),
(1, 1),
(1, 0),
]),
..Default::default()
},
Token {
lemma: Owned("生而自由oo".to_string()),
char_end: 9,
byte_end: 17,
script: Script::Cj,
char_map: Some(vec![
(1, 0),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(1, 0),
(1, 1),
(1, 1),
(1, 0),
]),
..Default::default()
},
]
}
// expected result of the complete Normalizer pieline.
#[cfg(feature = "chinese-normalization-pinyin")]
fn normalized_tokens() -> Vec<Token<'static>> {
vec![
Token {
lemma: Owned("shēngérzìyóuoo".to_string()),
char_end: 9,
byte_end: 17,
script: Script::Cj,
char_map: Some(vec![
(1, 0),
(3, 6),
(3, 3),
(3, 3),
(3, 4),
(1, 0),
(1, 1),
(1, 1),
(1, 0),
]),
kind: TokenKind::Word,
..Default::default()
},
Token {
lemma: Owned("shēngérzìyóuoo".to_string()),
char_end: 9,
byte_end: 17,
script: Script::Cj,
char_map: Some(vec![
(1, 0),
(3, 6),
(3, 3),
(3, 3),
(3, 4),
(1, 0),
(1, 1),
(1, 1),
(1, 0),
]),
kind: TokenKind::Word,
..Default::default()
},
]
}
// expected result of the complete Normalizer pieline.
#[cfg(not(feature = "chinese-normalization-pinyin"))]
fn normalized_tokens() -> Vec<Token<'static>> {
vec![
Token {
lemma: Owned("生而自由oo".to_string()),
char_end: 9,
byte_end: 17,
script: Script::Cj,
char_map: Some(vec![
(1, 0),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(1, 0),
(1, 1),
(1, 1),
(1, 0),
]),
kind: TokenKind::Word,
..Default::default()
},
Token {
lemma: Owned("生而自由oo".to_string()),
char_end: 9,
byte_end: 17,
script: Script::Cj,
char_map: Some(vec![
(1, 0),
(3, 3),
(3, 3),
(3, 3),
(3, 3),
(1, 0),
(1, 1),
(1, 1),
(1, 0),
]),
kind: TokenKind::Word,
..Default::default()
},
]
}
test_normalizer!(ControlCharNormalizer, tokens(), normalizer_result(), normalized_tokens());
}