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Merge pull request #33 from l4l/locales
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| use std::ffi::CStr; | ||
|
|
||
| use once_cell::sync::OnceCell; | ||
| use regex::Regex; | ||
|
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| #[cfg_attr(test, derive(Debug, PartialEq, Eq))] | ||
| pub struct Locale<'a> { | ||
| lang: Option<&'a str>, | ||
| country: Option<&'a str>, | ||
| modifier: Option<&'a str>, | ||
| } | ||
|
|
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| const LOCALE_REGEX: &str = r#"(?x) | ||
| ^ | ||
| ([[:alpha:]]+) # lang | ||
| (?:_([[:alpha:]]+))? # country | ||
| (?:\.[^@]*)? # encoding | ||
| (?:@(.*))? # modifier | ||
| $"#; | ||
|
|
||
| impl<'a> Locale<'a> { | ||
| fn from_caputres(s: &'a str, captures: regex::Captures<'_>) -> Self { | ||
| Self { | ||
| lang: captures.get(1).map(|m| &s[m.range()]), | ||
| country: captures.get(2).map(|m| &s[m.range()]), | ||
| modifier: captures.get(3).map(|m| &s[m.range()]), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl Locale<'static> { | ||
| pub fn current<'a>() -> &'a Self { | ||
| static LOCALE: OnceCell<Option<Locale<'static>>> = OnceCell::new(); | ||
| LOCALE | ||
| .get_or_init(|| { | ||
| let s = unsafe { | ||
| let ptr = libc::setlocale(libc::LC_MESSAGES, b"\0".as_ptr().cast()); | ||
| if ptr.is_null() { | ||
| return None; | ||
| } | ||
| CStr::from_ptr(ptr) | ||
| } | ||
| .to_str() | ||
| .ok()?; | ||
|
|
||
| let re = Regex::new(LOCALE_REGEX).unwrap(); | ||
|
|
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| let c = re.captures(s)?; | ||
|
|
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| Some(Self::from_caputres(s, c)) | ||
| }) | ||
| .as_ref() | ||
| .unwrap_or(&Self { | ||
| lang: None, | ||
| country: None, | ||
| modifier: None, | ||
| }) | ||
| } | ||
|
|
||
| pub fn keys(&self) -> impl Iterator<Item = impl AsRef<str>> + '_ { | ||
| static LOCALE_ITERS: OnceCell<Vec<String>> = OnceCell::new(); | ||
| LOCALE_ITERS | ||
| .get_or_init(|| { | ||
| let mut v = vec![]; | ||
| if let Some(((l, c), m)) = self.lang.zip(self.country).zip(self.modifier) { | ||
| v.push(format!("{}_{}@{}", l, c, m)); | ||
| } | ||
| if let Some((l, c)) = self.lang.zip(self.country) { | ||
| v.push(format!("{}_{}", l, c)); | ||
| } | ||
| if let Some((l, m)) = self.lang.zip(self.modifier) { | ||
| v.push(format!("{}@{}", l, m)); | ||
| } | ||
| if let Some(l) = self.lang { | ||
| v.push(l.to_string()); | ||
| } | ||
|
|
||
| v | ||
| }) | ||
| .clone() | ||
| .into_iter() | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
|
|
||
| use test_case::test_case; | ||
|
|
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| #[test] | ||
| fn regex_compiles() { | ||
| let _ = Regex::new(LOCALE_REGEX).unwrap(); | ||
| } | ||
|
|
||
| #[test] | ||
| fn regex_doesnt_match_empty() { | ||
| let re = Regex::new(LOCALE_REGEX).unwrap(); | ||
| assert!(re.captures("").is_none()); | ||
| } | ||
|
|
||
| impl Locale<'static> { | ||
| fn new( | ||
| lang: impl Into<Option<&'static str>>, | ||
| country: impl Into<Option<&'static str>>, | ||
| modifier: impl Into<Option<&'static str>>, | ||
| ) -> Self { | ||
| Self { | ||
| lang: lang.into(), | ||
| country: country.into(), | ||
| modifier: modifier.into(), | ||
| } | ||
| } | ||
| } | ||
|
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| #[test_case("qw", Locale::new("qw", None, None); "lang")] | ||
| #[test_case("qw_ER", Locale::new("qw", "ER", None); "lang, country")] | ||
| #[test_case("qw_ER.ty", Locale::new("qw", "ER", None); "lang, country, encoding")] | ||
| #[test_case( | ||
| "qw_ER.ty@ui", | ||
| Locale::new("qw", "ER", "ui"); | ||
| "lang, country, encoding, modifier" | ||
| )] | ||
| #[test_case("qw@ui", Locale::new("qw", None, "ui"); "lang, modifier")] | ||
| fn regex_compiles(s: &str, x: Locale<'static>) { | ||
| let re = Regex::new(LOCALE_REGEX).unwrap(); | ||
| let c = re.captures(s).unwrap(); | ||
|
|
||
| let m = c.get(0).unwrap(); | ||
| assert_eq!(m.start(), 0); | ||
| assert_eq!(m.end(), s.len()); | ||
|
|
||
| assert_eq!(Locale::from_caputres(s, c), x); | ||
| } | ||
| } |