vendor/icu_locid/src/extensions/unicode/key.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     /// A key used in a list of [`Keywords`](super::Keywords).
   7     ///
   8     /// The key has to be a two ASCII alphanumerical characters long, with the first
   9     /// character being alphanumeric, and the second being alphabetic.
  10     ///
  11     ///
  12     /// # Examples
  13     ///
  14     /// ```
  15     /// use icu::locid::extensions::unicode::Key;
  16     ///
  17     /// assert!("ca".parse::<Key>().is_ok());
  18     /// ```
  19     Key,
  20     extensions::unicode::Key,
  21     extensions_unicode_key,
  22     2..=2,
  23     s,
  24     s.all_bytes()[0].is_ascii_alphanumeric() && s.all_bytes()[1].is_ascii_alphabetic(),
  25     s.to_ascii_lowercase(),
  26     (s.all_bytes()[0].is_ascii_lowercase() || s.all_bytes()[0].is_ascii_digit())
  27         && s.all_bytes()[1].is_ascii_lowercase(),
  28     InvalidExtension,
  29     ["ca", "8a"],
  30     ["a", "a8", "abc"],
  31 );