icu_locid/extensions/other/subtag.rs
// 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 single item used in a list of [`Other`](super::Other) extensions.
///
/// The subtag has to be an ASCII alphanumerical string no shorter than
/// two characters and no longer than eight.
///
/// # Examples
///
/// ```
/// use icu::locid::extensions::other::subtag;
///
/// assert_eq!(subtag!("Foo").as_str(), "foo");
/// ```
Subtag,
extensions::other,
subtag,
extensions_other_subtag,
2..=8,
s,
s.is_ascii_alphanumeric(),
s.to_ascii_lowercase(),
s.is_ascii_alphanumeric() && s.is_ascii_lowercase(),
InvalidExtension,
["foo12"],
["y", "toolooong"],
);
impl Subtag {
pub(crate) const fn valid_key(v: &[u8]) -> bool {
2 <= v.len() && v.len() <= 8
}
}