icu_locid/extensions/unicode/
attribute.rs

1// This file is part of ICU4X. For terms of use, please see the file
2// called LICENSE at the top level of the ICU4X source tree
3// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
4
5impl_tinystr_subtag!(
6    /// An attribute used in a set of [`Attributes`](super::Attributes).
7    ///
8    /// An attribute has to be a sequence of alphanumerical characters no
9    /// shorter than three and no longer than eight characters.
10    ///
11    ///
12    /// # Examples
13    ///
14    /// ```
15    /// use icu::locid::extensions::unicode::{attribute, Attribute};
16    ///
17    /// let attr: Attribute =
18    ///     "buddhist".parse().expect("Failed to parse an Attribute.");
19    ///
20    /// assert_eq!(attr, attribute!("buddhist"));
21    /// ```
22    Attribute,
23    extensions::unicode,
24    attribute,
25    extensions_unicode_attribute,
26    3..=8,
27    s,
28    s.is_ascii_alphanumeric(),
29    s.to_ascii_lowercase(),
30    s.is_ascii_alphanumeric() && s.is_ascii_lowercase(),
31    InvalidExtension,
32    ["foo12"],
33    ["no", "toolooong"],
34);