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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 [`Private`](super::Private) extensions.
///
/// The subtag has to be an ASCII alphanumerical string no shorter than
/// one character and no longer than eight.
///
/// # Examples
///
/// ```
/// use icu::locale::extensions::private::Subtag;
///
/// let subtag1: Subtag = "Foo".parse()
/// .expect("Failed to parse a Subtag.");
///
/// assert_eq!(subtag1.as_str(), "foo");
/// ```
///
/// Notice: This is different from the generic [`Subtag`](crate::subtags::Subtag)
/// which is between two and eight characters.
///
/// ```
/// use icu::locale::extensions::private;
/// use icu::locale::subtags;
///
/// let subtag: Result<private::Subtag, _> = "f".parse();
/// assert!(subtag.is_ok());
///
/// let subtag: Result<subtags::Subtag, _> = "f".parse();
/// assert!(subtag.is_err());
/// ```
Subtag,
extensions::private,
subtag,
extensions_private_subtag,
1..=8,
s,
s.is_ascii_alphanumeric(),
s.to_ascii_lowercase(),
s.is_ascii_alphanumeric() && s.is_ascii_lowercase(),
InvalidExtension,
["foo12"],
["toolooong"],
);