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use std::collections::HashMap;
use std::fs::read_dir;
use std::path::{Path, PathBuf};
use std::sync::Arc;
use fluent_bundle::concurrent::FluentBundle;
use fluent_bundle::{FluentResource, FluentValue};
use crate::error::LoaderError;
pub use unic_langid::{langid, langids, LanguageIdentifier};
pub struct ArcLoaderBuilder<'a, 'b> {
location: &'a Path,
fallback: LanguageIdentifier,
shared: Option<&'b [PathBuf]>,
customize: Option<fn(&mut FluentBundle<Arc<FluentResource>>)>,
}
impl<'a, 'b> ArcLoaderBuilder<'a, 'b> {
pub fn shared_resources(mut self, shared: Option<&'b [PathBuf]>) -> Self {
self.shared = shared;
self
}
pub fn customize(mut self, customize: fn(&mut FluentBundle<Arc<FluentResource>>)) -> Self {
self.customize = Some(customize);
self
}
pub fn build(self) -> Result<ArcLoader, Box<dyn std::error::Error>> {
let mut resources = HashMap::new();
for entry in read_dir(self.location)? {
let entry = entry?;
if entry.file_type()?.is_dir() {
if let Ok(lang) = entry.file_name().into_string() {
let lang_resources = crate::fs::read_from_dir(entry.path())?
.into_iter()
.map(Arc::new)
.collect::<Vec<_>>();
resources.insert(lang.parse::<LanguageIdentifier>()?, lang_resources);
}
}
}
let mut bundles = HashMap::new();
for (lang, v) in resources.iter() {
let mut bundle = FluentBundle::new(vec![lang.clone()]);
for shared_resource in self.shared.as_deref().unwrap_or(&[]) {
bundle
.add_resource(Arc::new(crate::fs::read_from_file(shared_resource)?))
.map_err(|errors| LoaderError::FluentBundle { errors })?;
}
for res in v {
bundle
.add_resource(res.clone())
.map_err(|errors| LoaderError::FluentBundle { errors })?;
}
if let Some(customize) = self.customize {
(customize)(&mut bundle);
}
bundles.insert(lang.clone(), bundle);
}
let fallbacks = super::build_fallbacks(&*resources.keys().cloned().collect::<Vec<_>>());
Ok(ArcLoader {
bundles,
fallbacks,
fallback: self.fallback,
})
}
}
pub struct ArcLoader {
bundles: HashMap<LanguageIdentifier, FluentBundle<Arc<FluentResource>>>,
fallback: LanguageIdentifier,
fallbacks: HashMap<LanguageIdentifier, Vec<LanguageIdentifier>>,
}
impl super::Loader for ArcLoader {
fn lookup_complete<T: AsRef<str>>(
&self,
lang: &LanguageIdentifier,
text_id: &str,
args: Option<&HashMap<T, FluentValue>>,
) -> String {
if let Some(fallbacks) = self.fallbacks.get(lang) {
for l in fallbacks {
if let Some(val) = self.lookup_single_language(l, text_id, args) {
return val;
}
}
}
if *lang != self.fallback {
if let Some(val) = self.lookup_single_language(&self.fallback, text_id, args) {
return val;
}
}
format!("Unknown localization {}", text_id)
}
fn locales(&self) -> Box<dyn Iterator<Item = &LanguageIdentifier> + '_> {
Box::new(self.fallbacks.keys())
}
}
impl ArcLoader {
pub fn builder<P: AsRef<Path> + ?Sized>(
location: &P,
fallback: LanguageIdentifier,
) -> ArcLoaderBuilder {
ArcLoaderBuilder {
location: location.as_ref(),
fallback,
shared: None,
customize: None,
}
}
pub fn lookup_single_language<T: AsRef<str>>(
&self,
lang: &LanguageIdentifier,
text_id: &str,
args: Option<&HashMap<T, FluentValue>>,
) -> Option<String> {
super::shared::lookup_single_language(&self.bundles, lang, text_id, args)
}
pub fn lookup_no_default_fallback<S: AsRef<str>>(
&self,
lang: &LanguageIdentifier,
text_id: &str,
args: Option<&HashMap<S, FluentValue>>,
) -> Option<String> {
super::shared::lookup_no_default_fallback(
&self.bundles,
&self.fallbacks,
lang,
text_id,
args,
)
}
}