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complex.rs
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complex.rs
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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
use crate::dictionary::DictionarySegmenter;
use crate::language::*;
use crate::provider::*;
use alloc::vec::Vec;
use icu_locid::{locale, Locale};
use icu_provider::prelude::*;
#[cfg(feature = "lstm")]
use crate::lstm::LstmSegmenter;
#[derive(Default, Debug)]
pub(crate) struct LstmPayloads {
pub burmese: Option<DataPayload<LstmDataV1Marker>>,
pub khmer: Option<DataPayload<LstmDataV1Marker>>,
pub lao: Option<DataPayload<LstmDataV1Marker>>,
pub thai: Option<DataPayload<LstmDataV1Marker>>,
}
#[cfg(feature = "lstm")]
impl LstmPayloads {
pub fn best(&self, codepoint: u32) -> Option<&DataPayload<LstmDataV1Marker>> {
let lang = get_language(codepoint);
match lang {
Language::Burmese => self.burmese.as_ref(),
Language::Khmer => self.khmer.as_ref(),
Language::Lao => self.lao.as_ref(),
Language::Thai => self.thai.as_ref(),
_ => None,
}
}
/// Construct a [`LstmPayloads`] for all supported languages.
pub(crate) fn try_new<D: DataProvider<LstmForWordLineAutoV1Marker> + ?Sized>(
provider: &D,
) -> Result<Self, DataError> {
let burmese = Self::load(provider, locale!("my"))?;
let khmer = Self::load(provider, locale!("km"))?;
let lao = Self::load(provider, locale!("lo"))?;
let thai = Self::load(provider, locale!("th"))?;
Ok(LstmPayloads {
burmese,
khmer,
lao,
thai,
})
}
pub(crate) fn load<D: DataProvider<LstmForWordLineAutoV1Marker> + ?Sized>(
provider: &D,
locale: Locale,
) -> Result<Option<DataPayload<LstmDataV1Marker>>, DataError> {
match provider.load(DataRequest {
locale: &DataLocale::from(locale),
metadata: {
let mut m = DataRequestMetadata::default();
m.silent = true;
m
},
}) {
Ok(response) => Ok(Some(response.take_payload()?.cast())),
Err(DataError {
kind: DataErrorKind::MissingLocale,
..
}) => Ok(None),
Err(e) => Err(e),
}
}
}
#[derive(Default, Debug)]
pub(crate) struct Dictionary {
pub burmese: Option<DataPayload<UCharDictionaryBreakDataV1Marker>>,
pub khmer: Option<DataPayload<UCharDictionaryBreakDataV1Marker>>,
pub lao: Option<DataPayload<UCharDictionaryBreakDataV1Marker>>,
pub thai: Option<DataPayload<UCharDictionaryBreakDataV1Marker>>,
pub cj: Option<DataPayload<UCharDictionaryBreakDataV1Marker>>,
}
impl Dictionary {
fn best(&self, input: u32) -> Option<&DataPayload<UCharDictionaryBreakDataV1Marker>> {
match get_language(input) {
Language::Burmese => self.burmese.as_ref(),
Language::Khmer => self.khmer.as_ref(),
Language::Lao => self.lao.as_ref(),
Language::Thai => self.thai.as_ref(),
Language::ChineseOrJapanese => self.cj.as_ref(),
_ => None,
}
}
/// Construct a [`Dictionary`] for all supported languages.
pub(crate) fn new<
D: DataProvider<DictionaryForWordOnlyAutoV1Marker>
+ DataProvider<DictionaryForWordLineExtendedV1Marker>
+ ?Sized,
>(
provider: &D,
) -> Self {
let burmese = Self::load_southeast_asian(provider, locale!("my")).ok();
let khmer = Self::load_southeast_asian(provider, locale!("km")).ok();
let lao = Self::load_southeast_asian(provider, locale!("lo")).ok();
let thai = Self::load_southeast_asian(provider, locale!("th")).ok();
let cj = Self::load_chinese_japanese(provider, locale!("ja")).ok();
Dictionary {
burmese,
khmer,
lao,
thai,
cj,
}
}
/// Construct a [`Dictionary`] for Chinese and Japanese.
#[cfg(feature = "auto")] // Use by WordSegmenter with "auto" enabled.
pub(crate) fn new_chinese_japanese<
D: DataProvider<DictionaryForWordOnlyAutoV1Marker> + ?Sized,
>(
provider: &D,
) -> Self {
let cj = Self::load_chinese_japanese(provider, locale!("ja")).ok();
Dictionary {
cj,
..Default::default()
}
}
pub(crate) fn load_chinese_japanese<
D: DataProvider<DictionaryForWordOnlyAutoV1Marker> + ?Sized,
>(
provider: &D,
locale: Locale,
) -> Result<DataPayload<UCharDictionaryBreakDataV1Marker>, DataError> {
provider
.load(DataRequest {
locale: &DataLocale::from(locale),
metadata: {
let mut m = DataRequestMetadata::default();
m.silent = true;
m
},
})?
.take_payload()
.map(DataPayload::cast)
}
/// Construct a [`Dictionary`] for Southeast Asian languages (Burmese, Khmer, Lao, and Thai).
pub(crate) fn new_southeast_asian<
D: DataProvider<DictionaryForWordLineExtendedV1Marker> + ?Sized,
>(
provider: &D,
) -> Self {
let burmese = Self::load_southeast_asian(provider, locale!("my")).ok();
let khmer = Self::load_southeast_asian(provider, locale!("km")).ok();
let lao = Self::load_southeast_asian(provider, locale!("lo")).ok();
let thai = Self::load_southeast_asian(provider, locale!("th")).ok();
Dictionary {
burmese,
khmer,
lao,
thai,
..Default::default()
}
}
pub(crate) fn load_southeast_asian<
D: DataProvider<DictionaryForWordLineExtendedV1Marker> + ?Sized,
>(
provider: &D,
locale: Locale,
) -> Result<DataPayload<UCharDictionaryBreakDataV1Marker>, DataError> {
provider
.load(DataRequest {
locale: &DataLocale::from(locale),
metadata: Default::default(),
})?
.take_payload()
.map(DataPayload::cast)
}
}
/// Return UTF-16 segment offset array using dictionary or lstm segmenter.
#[allow(unused_variables)]
pub(crate) fn complex_language_segment_utf16(
dictionary: Option<&Dictionary>,
lstm: Option<&LstmPayloads>,
grapheme: Option<&RuleBreakDataV1>,
input: &[u16],
) -> Vec<usize> {
let mut result: Vec<usize> = Vec::new();
let lang_iter = LanguageIteratorUtf16::new(input);
let mut offset = 0;
for str_per_lang in lang_iter {
if let Some(first_ch) = str_per_lang.first() {
#[cfg(feature = "lstm")]
if let Some(lstm) = lstm {
if let Some(model) = lstm.best(*first_ch as u32) {
if let Ok(segmenter) = LstmSegmenter::try_new(model, grapheme) {
let breaks = segmenter.segment_utf16(str_per_lang);
result.extend(breaks.map(|n| offset + n));
offset += str_per_lang.len();
result.push(offset);
continue;
}
}
}
if let Some(dictionary) = dictionary {
if let Some(grapheme) = grapheme {
if let Some(payload) = dictionary.best(*first_ch as u32) {
if let Ok(segmenter) = DictionarySegmenter::try_new(payload, grapheme) {
let breaks = segmenter.segment_utf16(str_per_lang);
result.extend(breaks.map(|n| offset + n));
offset += str_per_lang.len();
continue;
}
}
}
}
offset += str_per_lang.len();
result.push(offset);
}
}
result
}
/// Return UTF-8 segment offset array using dictionary or lstm segmenter.
#[allow(unused_variables)]
pub(crate) fn complex_language_segment_str(
dictionary: Option<&Dictionary>,
lstm: Option<&LstmPayloads>,
grapheme: Option<&RuleBreakDataV1>,
input: &str,
) -> Vec<usize> {
let mut result: Vec<usize> = Vec::new();
let lang_iter = LanguageIterator::new(input);
let mut offset = 0;
for str_per_lang in lang_iter {
if let Some(first_ch) = str_per_lang.chars().next() {
#[cfg(feature = "lstm")]
if let Some(lstm) = lstm {
if let Some(model) = lstm.best(first_ch as u32) {
if let Ok(segmenter) = LstmSegmenter::try_new(model, grapheme) {
let breaks = segmenter.segment_str(str_per_lang);
result.extend(breaks.map(|n| offset + n));
offset += str_per_lang.len();
result.push(offset);
continue;
}
}
}
if let Some(dictionary) = dictionary {
if let Some(grapheme) = grapheme {
if let Some(payload) = dictionary.best(first_ch as u32) {
if let Ok(segmenter) = DictionarySegmenter::try_new(payload, grapheme) {
let breaks = segmenter.segment_str(str_per_lang);
result.extend(breaks.map(|n| offset + n));
offset += str_per_lang.len();
continue;
}
}
}
}
offset += str_per_lang.len();
result.push(offset);
}
}
result
}
#[cfg(test)]
#[cfg(feature = "serde")]
mod tests {
use super::*;
use icu_locid::locale;
#[test]
fn thai_word_break() {
const TEST_STR: &str = "ภาษาไทยภาษาไทย";
let data_locale = locale!("th").into();
let payload = DataProvider::<DictionaryForWordLineExtendedV1Marker>::load(
&icu_testdata::buffer().as_deserializing(),
DataRequest {
locale: &data_locale,
metadata: Default::default(),
},
)
.expect("Loading should succeed!")
.take_payload()
.expect("Data should be present!")
.cast();
let dictionary = Dictionary {
burmese: None,
khmer: None,
lao: None,
thai: Some(payload),
cj: None,
};
let payload = DataProvider::<LstmForWordLineAutoV1Marker>::load(
&icu_testdata::buffer().as_deserializing(),
DataRequest {
locale: &data_locale,
metadata: Default::default(),
},
)
.expect("Loading should succeed!")
.take_payload()
.expect("Data should be present!")
.cast();
let lstm = LstmPayloads {
burmese: None,
khmer: None,
lao: None,
thai: Some(payload),
};
let grapheme: DataPayload<GraphemeClusterBreakDataV1Marker> = icu_testdata::buffer()
.as_deserializing()
.load(Default::default())
.expect("Loading should succeed!")
.take_payload()
.expect("Data should be present!");
let breaks = complex_language_segment_str(
Some(&dictionary),
Some(&lstm),
Some(grapheme.get()),
TEST_STR,
);
assert_eq!(breaks, [12, 21, 33, 42], "Thai test by UTF-8");
let utf16: Vec<u16> = TEST_STR.encode_utf16().collect();
let breaks = complex_language_segment_utf16(
Some(&dictionary),
Some(&lstm),
Some(grapheme.get()),
&utf16,
);
assert_eq!(breaks, [4, 7, 11, 14], "Thai test by UTF-16");
}
}