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use std::ops::Range;
use crate::error::L10nError;
use crate::prelude::L10nBundle;
pub struct L10nLanguageVec {
langs: Vec<L10nBundle>,
}
impl L10nLanguageVec {
/// Load all languages, with Unicode bidi isolation marks around
/// interpolated variables. See [`L10nBundle::new`].
pub fn load<S, I>(bytes: &[u8], iter: I) -> Result<Self, L10nError>
where
S: AsRef<str>,
I: Iterator<Item = (S, Range<usize>)>,
{
Self::build(bytes, iter, true)
}
/// Load all languages, without Unicode bidi isolation marks. See
/// [`L10nBundle::new_without_isolation`].
pub fn load_without_isolation<S, I>(bytes: &[u8], iter: I) -> Result<Self, L10nError>
where
S: AsRef<str>,
I: Iterator<Item = (S, Range<usize>)>,
{
Self::build(bytes, iter, false)
}
fn build<S, I>(bytes: &[u8], iter: I, use_isolating: bool) -> Result<Self, L10nError>
where
S: AsRef<str>,
I: Iterator<Item = (S, Range<usize>)>,
{
Ok(Self {
langs: iter
.map(|(lang, range)| {
let data = &bytes[range];
if use_isolating {
L10nBundle::new(lang, data)
} else {
L10nBundle::new_without_isolation(lang, data)
}
})
.collect::<Result<Vec<_>, L10nError>>()?,
})
}
/// Add `bundle` to the loaded set, replacing any bundle already loaded for
/// the same language.
///
/// This is how a translation that was not part of the build becomes
/// available at runtime: load an external `.ftl` (with the generated
/// `L10nLanguage::new_external`, or [`L10nBundle::new`] directly) and
/// insert it. Inserting an already-loaded language replaces it, which is
/// the hot-reload path for a translation under revision.
pub fn insert(&mut self, bundle: L10nBundle) {
match self.langs.iter_mut().find(|b| b.lang() == bundle.lang()) {
Some(slot) => *slot = bundle,
None => self.langs.push(bundle),
}
}
/// Negotiate the best of the *loaded* languages for an `Accept-Language`
/// header — including any added at runtime with [`Self::insert`], which
/// the generated `L10n::langneg` (compiled from the build-time language
/// set) can never return.
///
/// Returns `None` when nothing matches; there is no compiled-in default
/// here, so the caller picks its own fallback, e.g.
/// `vec.langneg(header).unwrap_or_else(|| vec.get(L10n::default()))`.
#[cfg(feature = "langneg")]
pub fn langneg(&self, accept_language: &str) -> Option<&L10nBundle> {
use icu_locale_core::LanguageIdentifier;
let available: Vec<Option<LanguageIdentifier>> =
self.langs.iter().map(|b| b.lang().parse().ok()).collect();
for req in crate::prelude::requested_languages(accept_language) {
let found = available
.iter()
.position(|a| a.as_ref().is_some_and(|a| a.language == req.language));
if let Some(idx) = found {
return Some(&self.langs[idx]);
}
}
None
}
/// Get the bundle for `lang`, or `None` if no such language was loaded.
///
/// `lang` is matched against the language ids the vec was loaded from (the
/// `L10n` enum variants). Reach for this when `lang` comes from outside that
/// set — a raw header, a query parameter, user input — and a miss is a case
/// you want to handle rather than a bug. When you already hold a known `L10n`
/// variant, [`Self::get`] is more convenient.
pub fn try_get(&self, lang: impl AsRef<str>) -> Option<&L10nBundle> {
let lang = lang.as_ref();
self.langs.iter().find(|b| b.lang() == lang)
}
/// Get the bundle for `lang`.
///
/// Pass an `L10n` enum variant (one of the languages the vec was loaded
/// from); the lookup is then guaranteed to succeed. The variant returned by
/// the generated `L10n::langneg` always qualifies.
///
/// # Panics
///
/// Panics if `lang` was not loaded. Use [`Self::try_get`] when `lang` may be
/// outside the loaded set and you want to handle the miss.
pub fn get(&self, lang: impl AsRef<str>) -> &L10nBundle {
let lang = lang.as_ref();
self.try_get(lang).unwrap_or_else(|| {
panic!(
"L10nLanguageVec::get: language '{lang}' was not loaded. Pass an \
`L10n` enum variant (the languages the vec was loaded from), or \
use `try_get` to handle a missing language."
)
})
}
}