vendor/icu_locid/src/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
   5 impl_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;
  16     /// use icu::locid::extensions_unicode_attribute as attribute;
  17     ///
  18     /// let attr: Attribute =
  19     ///     "buddhist".parse().expect("Failed to parse an Attribute.");
  20     ///
  21     /// assert_eq!(attr, attribute!("buddhist"));
  22     /// ```
  23     Attribute,
  24     extensions::unicode::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 );