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# icu_locid_transform [](https://crates.io/crates/icu_locid_transform)
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Canonicalization of locale identifiers based on [`CLDR`] data.
This module is published as its own crate ([`icu_locid_transform`](https://docs.rs/icu_locid_transform/latest/icu_locid_transform/))
and as part of the [`icu`](https://docs.rs/icu/latest/icu/) crate. See the latter for more details on the ICU4X project.
It currently supports locale canonicalization based upon the canonicalization
algorithm from [`UTS #35: Unicode LDML 3. LocaleId Canonicalization`],
as well as the minimize and maximize likely subtags algorithms
as described in [`UTS #35: Unicode LDML 3. Likely Subtags`].
The maximize method potentially updates a passed in locale in place
depending up the results of running the 'Add Likely Subtags' algorithm
from [`UTS #35: Unicode LDML 3. Likely Subtags`].
This minimize method returns a new Locale that is the result of running the
'Remove Likely Subtags' algorithm from [`UTS #35: Unicode LDML 3. Likely Subtags`].
## Examples
```rust
use icu::locid::Locale;
use icu::locid_transform::{LocaleCanonicalizer, TransformResult};
let lc = LocaleCanonicalizer::new();
let mut locale: Locale = "ja-Latn-fonipa-hepburn-heploc"
.parse()
.expect("parse failed");
assert_eq!(lc.canonicalize(&mut locale), TransformResult::Modified);
assert_eq!(locale, "ja-Latn-alalc97-fonipa".parse::<Locale>().unwrap());
```
```rust
use icu::locid::locale;
use icu::locid_transform::{LocaleExpander, TransformResult};
let lc = LocaleExpander::new();
let mut locale = locale!("zh-CN");
assert_eq!(lc.maximize(&mut locale), TransformResult::Modified);
assert_eq!(locale, locale!("zh-Hans-CN"));
let mut locale = locale!("zh-Hant-TW");
assert_eq!(lc.maximize(&mut locale), TransformResult::Unmodified);
assert_eq!(locale, locale!("zh-Hant-TW"));
```
```rust
use icu::locid::locale;
use icu::locid_transform::{LocaleExpander, TransformResult};
use writeable::assert_writeable_eq;
let lc = LocaleExpander::new();
let mut locale = locale!("zh-Hans-CN");
assert_eq!(lc.minimize(&mut locale), TransformResult::Modified);
assert_eq!(locale, locale!("zh"));
let mut locale = locale!("zh");
assert_eq!(lc.minimize(&mut locale), TransformResult::Unmodified);
assert_eq!(locale, locale!("zh"));
```
[`ICU4X`]: ../icu/index.html
[`UTS #35: Unicode LDML 3. LocaleId Canonicalization`]: http://unicode.org/reports/tr35/#LocaleId_Canonicalization,
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## More Information
For more information on development, authorship, contributing etc. please visit [`ICU4X home page`](https://github.com/unicode-org/icu4x).