icu_provider_source/transforms/mod.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 super::cldr_serde::transforms;
use super::CldrCache;
use crate::SourceDataProvider;
use icu::experimental::transliterate::provider::*;
use icu::experimental::transliterate::RuleCollection;
use icu::locale::Locale;
use icu_provider::prelude::*;
use itertools::Itertools;
use std::collections::HashSet;
use std::sync::Mutex;
impl CldrCache {
pub(crate) fn transforms(&self) -> Result<&Mutex<RuleCollection>, DataError> {
self.transforms
.get_or_init(|| {
fn invent_bcp47(transform: &str) -> Locale {
let transform = transform.to_ascii_lowercase();
let r = ["und", "x"]
.into_iter()
.chain(
transform
.split('-')
.map(|t| &t[..core::cmp::min(8, t.len())]),
)
.join("-")
.parse()
.unwrap();
r
}
let mut provider = RuleCollection::default();
for transform in self.serde_cache.list("cldr-transforms/transforms/")? {
let Some(transform) = transform.strip_suffix(".json") else {
continue;
};
if transform == "und-Ethi-t-und-latn-m0-beta_metsehaf-geminate" {
// References an unknown transliterator
continue;
}
if transform == "byn-Ethi-t-byn-latn-m0-xaleget" {
// Doesn't parse (backreference error)
continue;
}
if transform == "Thai-Latin" {
// References an unknown transliterator (Any-BreakInternal)
continue;
}
let metadata = self
.serde_cache
.read_and_parse_json::<transforms::Resource>(&format!(
"cldr-transforms/transforms/{transform}.json"
))?;
let source = self
.serde_cache
.root
.read_to_string(&format!(
"cldr-transforms/transforms/{}",
metadata.rules_file
))?
// Declares a sequence of Unicode sets instead of a Unicode set
.replace(
"$initialPunct = [:Ps:][:Pi:];",
"$initialPunct = [[:Ps:][:Pi:]];",
)
// I'm not sure why this errors
.replace("ə̃ {ə̃}+ → ə̃;", "")
// This does not escape the $, so the = is interpreted as a variable name
.replace(r#""$="#, r#""\$="#)
// Any-ASCII does not exist and should probably the Latin-ASCII
.replace("Any-ASCII", "Latin-ASCII")
// Non-canonical property names
.replace("block=", "Block=")
.replace("script=", "Script=")
.replace("case-ignorable:", "Case_Ignorable:")
.replace("cased:", "Cased:")
.replace("ideographic:", "Ideographic:")
// Non-canonical property values
.replace("ccc=above", "ccc=Above")
.replace("ccc=below", "ccc=Below")
.replace("UppercaseLetter:", "Uppercase_Letter:")
.replace("nonspacing mark:", "Nonspacing_Mark:")
.replace("letter:", "Letter:")
.replace("ARABIC:", "Arabic:")
.replace("arabic:", "Arabic:")
.replace("bengali:", "Bengali:")
.replace("greek:", "Greek:")
.replace("han:", "Han:")
.replace("latin:", "Latin:")
.replace("thaana:", "Thaana:")
.replace("thai:", "Thai:");
if matches!(
metadata.direction,
transforms::Direction::Forward | transforms::Direction::Both
) {
let bcp47_alias =
if let Some(bcp47_aliases) = metadata.alias_bcp47.as_ref() {
Locale::try_from_str(bcp47_aliases.split(' ').next().unwrap())
.map_err(|_| {
DataError::custom("invalid locale")
.with_display_context(bcp47_aliases)
})?
} else {
invent_bcp47(&format!("{transform}-rev"))
};
provider.register_source(
&bcp47_alias,
source.clone(),
[metadata.alias.as_deref().unwrap_or(
match metadata.variant.as_deref() {
None => format!("{}-{}", metadata.source, metadata.target),
Some(v) => {
format!("{}-{}/{v}", metadata.source, metadata.target)
}
}
.as_str(),
)]
.into_iter()
.chain(
metadata
.alias_bcp47
.as_deref()
.unwrap_or_default()
.split(' ')
.skip(1),
),
false,
metadata.visibility == transforms::Visibility::External,
);
}
if matches!(
metadata.direction,
transforms::Direction::Backward | transforms::Direction::Both
) {
let bcp47_alias =
if let Some(bcp47_aliases) = metadata.backward_alias_bcp47.as_ref() {
Locale::try_from_str(bcp47_aliases.split(' ').next().unwrap())
.map_err(|_| {
DataError::custom("invalid locale")
.with_display_context(bcp47_aliases)
})?
} else {
invent_bcp47(&format!("{transform}-rev"))
};
provider.register_source(
&bcp47_alias,
source,
[metadata.backward_alias.as_deref().unwrap_or(
match metadata.variant.as_deref() {
None => format!("{}-{}", metadata.target, metadata.source),
Some(v) => {
format!("{}-{}/{v}", metadata.target, metadata.source)
}
}
.as_str(),
)]
.into_iter()
.chain(
metadata
.backward_alias_bcp47
.as_deref()
.unwrap_or_default()
.split(' ')
.skip(1),
),
true,
metadata.visibility == transforms::Visibility::External,
);
}
}
Ok(Mutex::new(provider))
})
.as_ref()
.map_err(|&e| e)
}
}
impl DataProvider<TransliteratorRulesV1Marker> for SourceDataProvider {
fn load(
&self,
req: DataRequest,
) -> Result<DataResponse<TransliteratorRulesV1Marker>, DataError> {
self.check_req::<TransliteratorRulesV1Marker>(req)?;
self.cldr()?
.transforms()?
.lock()
.expect("poison")
.as_provider_unstable(self, self)?
.load(req)
}
}
impl crate::IterableDataProviderCached<TransliteratorRulesV1Marker> for SourceDataProvider {
fn iter_ids_cached(&self) -> Result<HashSet<DataIdentifierCow<'static>>, DataError> {
Ok(self
.cldr()?
.transforms()?
.lock()
.expect("poison")
.as_provider_unstable(self, self)?
.iter_ids()?
.into_iter()
.map(|id| id.as_borrowed().into_owned())
.collect())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_de_ascii_forward() {
let provider = SourceDataProvider::new_testing();
let _data: DataPayload<TransliteratorRulesV1Marker> = provider
.load(DataRequest {
id: DataIdentifierCow::from_marker_attributes(
DataMarkerAttributes::from_str_or_panic("de-t-de-d0-ascii"),
)
.as_borrowed(),
..Default::default()
})
.unwrap()
.payload;
}
#[test]
fn test_latin_ascii_backward() {
let provider = SourceDataProvider::new_testing();
let _data: DataPayload<TransliteratorRulesV1Marker> = provider
.load(DataRequest {
id: DataIdentifierCow::from_marker_attributes(
DataMarkerAttributes::from_str_or_panic("und-latn-t-s0-ascii"),
)
.as_borrowed(),
..Default::default()
})
.unwrap()
.payload;
}
}