| mod.rs |
Unicode Extensions provide a mechanism to extend the [`LanguageIdentifier`] with
additional bits of information - a combination of a [`LanguageIdentifier`] and [`Extensions`]
is called [`Locale`].
There are four types of extensions:
* [`Unicode Extensions`] - marked as `u`.
* [`Transform Extensions`] - marked as `t`.
* [`Private Use Extensions`] - marked as `x`.
* [`Other Extensions`] - marked as any `a-z` except of `u`, `t` and `x`.
One can think of extensions as a bag of extra information on top of basic 4 [`subtags`].
Notice: `Other` extension type is currently not supported.
# Examples
```
use icu::locid::extensions::unicode::{Key, Value};
use icu::locid::Locale;
let loc: Locale = "en-US-u-ca-buddhist-t-en-us-h0-hybrid-x-foo"
.parse()
.expect("Failed to parse.");
assert_eq!(loc.id.language, "en".parse().unwrap());
assert_eq!(loc.id.script, None);
assert_eq!(loc.id.region, Some("US".parse().unwrap()));
assert_eq!(loc.id.variants.len(), 0);
let key: Key = "ca".parse().expect("Parsing key failed.");
let value: Value = "buddhist".parse().expect("Parsing value failed.");
assert_eq!(loc.extensions.unicode.keywords.get(&key), Some(&value));
```
[`LanguageIdentifier`]: super::LanguageIdentifier
[`Locale`]: super::Locale
[`subtags`]: super::subtags
[`Other Extensions`]: other
[`Private Use Extensions`]: private
[`Transform Extensions`]: transform
[`Unicode Extensions`]: unicode |
11882 |
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