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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 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
    }
}