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#18 in Internationalization (i18n)

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Used in 36 crates (10 directly)

MIT/Apache

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Language Tags

CI Crate informations License Documentation

This crate provides an implementation of language tags defined by RFC5646 (BCP47).

Usage

You can easily parse new language from anything that provides a [u8] reference:

extern crate langtag;
use langtag::LanguageTag;

fn main() -> Result<(), langtag::Error> {
  let tag = LanguageTag::parse("fr-FR")?;
  assert_eq!(tag.language().unwrap().primary(), "fr");
  assert!(tag == "Fr-fr"); // comparison is case-insensitive.
  Ok(())
}

Note that [LanguageTag::parse] does not copy the data it is given, but only borrows it. You can create an owning LanguageTag instance by using [LanguageTagBuf::parse_copy] to copy the data, or simply [LanguageTagBuf::new] to move the data.

Once parsed, you can explore every component of the language tag using the provided functions.

Mutable language tags

When the language tags owns its buffer through Vec<u8>, it becomes possible to access the tag mutably to modify it.

extern crate langtag;
use std::convert::TryInto;
use langtag::LangTag;

fn main() -> Result<(), langtag::Error> {
  let mut tag = LangTag::parse_copy("fr-FR")?;
  tag.language_mut().set_primary("jp".try_into()?);
  tag.set_region(None);
  tag.extensions_mut().insert('f'.try_into()?, "bar".try_into()?);
  assert_eq!(tag, "jp-f-bar");
  Ok(())
}

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

No runtime deps