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// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
impl_tinystr_subtag!(
/// A region subtag (examples: `"US"`, `"CN"`, `"AR"` etc.)
///
/// [`Region`] represents a Unicode base language code conformant to the
/// [`unicode_region_id`] field of the Language and Locale Identifier.
///
/// # Examples
///
/// ```
/// use icu::locid::subtags::Region;
///
/// let region: Region =
/// "DE".parse().expect("Failed to parse a region subtag.");
/// ```
///
/// [`unicode_region_id`]: https://unicode.org/reports/tr35/#unicode_region_id
Region,
subtags,
region,
subtags_region,
2..=3,
s,
if s.len() == 2 {
s.is_ascii_alphabetic()
} else {
s.is_ascii_numeric()
},
if s.len() == 2 {
s.to_ascii_uppercase()
} else {
s
},
if s.len() == 2 {
s.is_ascii_alphabetic_uppercase()
} else {
s.is_ascii_numeric()
},
InvalidSubtag,
["FR", "123"],
["12", "FRA", "b2"],
);
impl Region {
/// Returns true if the Region has an alphabetic code.
///
/// # Examples
///
/// ```
/// use icu::locid::subtags::Region;
///
/// let region = Region::try_from_bytes(b"us").expect("Parsing failed.");
///
/// assert!(region.is_alphabetic());
/// ```
pub fn is_alphabetic(&self) -> bool {
self.0.len() == 2
}
}