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|
mod tables;
pub use tables::CLDR_VERSION;
use crate::subtags;
unsafe fn lang_from_parts(
input: (Option<u64>, Option<u32>, Option<u32>),
lang: Option<subtags::Language>,
script: Option<subtags::Script>,
region: Option<subtags::Region>,
) -> Option<(
subtags::Language,
Option<subtags::Script>,
Option<subtags::Region>,
)> {
let lang = lang
.or_else(|| input.0.map(|s| subtags::Language::from_raw_unchecked(s)))
.unwrap();
let script = script.or_else(|| input.1.map(|s| subtags::Script::from_raw_unchecked(s)));
let region = region.or_else(|| input.2.map(|r| subtags::Region::from_raw_unchecked(r)));
Some((lang, script, region))
}
pub fn maximize(
lang: subtags::Language,
script: Option<subtags::Script>,
region: Option<subtags::Region>,
) -> Option<(
subtags::Language,
Option<subtags::Script>,
Option<subtags::Region>,
)> {
if !lang.is_empty() && script.is_some() && region.is_some() {
return None;
}
if let Some(l) = Into::<Option<u64>>::into(lang) {
if let Some(r) = region {
let result = tables::LANG_REGION
.binary_search_by_key(&(&l.into(), &r.into()), |(key_l, key_r, _)| (key_l, key_r))
.ok();
if let Some(r) = result {
// safe because all table entries are well formed.
return unsafe { lang_from_parts(tables::LANG_REGION[r].2, None, None, None) };
}
}
if let Some(s) = script {
let result = tables::LANG_SCRIPT
.binary_search_by_key(&(&l.into(), &s.into()), |(key_l, key_s, _)| (key_l, key_s))
.ok();
if let Some(r) = result {
// safe because all table entries are well formed.
return unsafe { lang_from_parts(tables::LANG_SCRIPT[r].2, None, None, None) };
}
}
let result = tables::LANG_ONLY
.binary_search_by_key(&(&l.into()), |(key_l, _)| key_l)
.ok();
if let Some(r) = result {
// safe because all table entries are well formed.
return unsafe { lang_from_parts(tables::LANG_ONLY[r].1, None, script, region) };
}
} else if let Some(s) = script {
if let Some(r) = region {
let result = tables::SCRIPT_REGION
.binary_search_by_key(&(&s.into(), &r.into()), |(key_s, key_r, _)| (key_s, key_r))
.ok();
if let Some(r) = result {
// safe because all table entries are well formed.
return unsafe { lang_from_parts(tables::SCRIPT_REGION[r].2, None, None, None) };
}
}
let result = tables::SCRIPT_ONLY
.binary_search_by_key(&(&s.into()), |(key_s, _)| key_s)
.ok();
if let Some(r) = result {
// safe because all table entries are well formed.
return unsafe { lang_from_parts(tables::SCRIPT_ONLY[r].1, None, None, region) };
}
} else if let Some(r) = region {
let result = tables::REGION_ONLY
.binary_search_by_key(&(&r.into()), |(key_r, _)| key_r)
.ok();
if let Some(r) = result {
// safe because all table entries are well formed.
return unsafe { lang_from_parts(tables::REGION_ONLY[r].1, None, None, None) };
}
}
None
}
pub fn minimize(
lang: subtags::Language,
script: Option<subtags::Script>,
region: Option<subtags::Region>,
) -> Option<(
subtags::Language,
Option<subtags::Script>,
Option<subtags::Region>,
)> {
// maximize returns None when all 3 components are
// already filled so don't call it in that case.
let max_langid = if !lang.is_empty() && script.is_some() && region.is_some() {
(lang, script, region)
} else {
maximize(lang, script, region)?
};
if let Some(trial) = maximize(max_langid.0, None, None) {
if trial == max_langid {
return Some((max_langid.0, None, None));
}
}
if max_langid.2.is_some() {
if let Some(trial) = maximize(max_langid.0, None, max_langid.2) {
if trial == max_langid {
return Some((max_langid.0, None, max_langid.2));
}
}
}
if max_langid.1.is_some() {
if let Some(trial) = maximize(max_langid.0, max_langid.1, None) {
if trial == max_langid {
return Some((max_langid.0, max_langid.1, None));
}
}
}
None
}
|
