use-locale-tag

Small BCP 47 / Unicode-style locale tag parsing and normalization primitives for RustUse.

Example

use use_locale_tag::{normalize_locale_tag, parse_locale_tag};

let tag = parse_locale_tag("zh-hant-tw").unwrap();

assert_eq!(tag.as_str(), "zh-Hant-TW");
assert_eq!(normalize_locale_tag("en-us"), Some("en-US".to_string()));

Scope

• Parse locale tags with language, optional script, optional region, and supported suffixes.
• Normalize language subtags to lowercase.
• Normalize script subtags to title case.
• Normalize alphabetic region subtags to uppercase.
• Preserve supported variants, extensions, and private-use suffixes without database canonicalization.

Non-goals

• Full CLDR canonicalization.
• ICU replacement behavior.
• Translation catalogs.
• Message formatting.
• Locale data loading.

License

Licensed under either of the following, at your option:

• Apache License, Version 2.0
• MIT license