| mod.rs |
Tools for locale fallback, enabling arbitrary input locales to be mapped into the nearest
locale with data.
The algorithm implemented in this module is called [Flexible Vertical Fallback](
https://docs.google.com/document/d/1Mp7EUyl-sFh_HZYgyeVwj88vJGpCBIWxzlCwGgLCDwM/edit).
Watch [#2243](https://github.com/unicode-org/icu4x/issues/2243) to track improvements to
this algorithm and steps to enshrine the algorithm in CLDR.
# Examples
```
use icu_locid::locale;
use icu_locid_transform::LocaleFallbacker;
// Set up a LocaleFallbacker with data.
let fallbacker = LocaleFallbacker::new();
// Create a LocaleFallbackerIterator with a default configuration.
// By default, uses language priority with no additional extension keywords.
let mut fallback_iterator = fallbacker
.for_config(Default::default())
.fallback_for(locale!("hi-Latn-IN").into());
// Run the algorithm and check the results.
assert_eq!(fallback_iterator.get(), &locale!("hi-Latn-IN").into());
fallback_iterator.step();
assert_eq!(fallback_iterator.get(), &locale!("hi-Latn").into());
fallback_iterator.step();
assert_eq!(fallback_iterator.get(), &locale!("en-IN").into());
fallback_iterator.step();
assert_eq!(fallback_iterator.get(), &locale!("en-001").into());
fallback_iterator.step();
assert_eq!(fallback_iterator.get(), &locale!("en").into());
fallback_iterator.step();
assert_eq!(fallback_iterator.get(), &locale!("und").into());
``` |
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