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, |
21 | key, |
22 | extensions_unicode_key, |
23 | 2..=2, |
24 | s, |
25 | s.all_bytes()[0].is_ascii_alphanumeric() && s.all_bytes()[1].is_ascii_alphabetic(), |
26 | s.to_ascii_lowercase(), |
27 | (s.all_bytes()[0].is_ascii_lowercase() || s.all_bytes()[0].is_ascii_digit()) |
28 | && s.all_bytes()[1].is_ascii_lowercase(), |
29 | InvalidExtension, |
30 | ["ca" , "8a" ], |
31 | ["a" , "a8" , "abc" ], |
32 | ); |
33 | |