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 [`Fields`](super::Fields). |
7 | /// |
8 | /// The key has to be a two ASCII characters long, with the first |
9 | /// character being alphabetic, and the second being a number. |
10 | /// |
11 | /// # Examples |
12 | /// |
13 | /// ``` |
14 | /// use icu::locid::extensions::transform::Key; |
15 | /// |
16 | /// let key1: Key = "k0".parse().expect("Failed to parse a Key."); |
17 | /// |
18 | /// assert_eq!(key1.as_str(), "k0"); |
19 | /// ``` |
20 | Key, |
21 | extensions::transform, |
22 | key, |
23 | extensions_transform_key, |
24 | 2..=2, |
25 | s, |
26 | s.all_bytes()[0].is_ascii_alphabetic() && s.all_bytes()[1].is_ascii_digit(), |
27 | s.to_ascii_lowercase(), |
28 | s.all_bytes()[0].is_ascii_lowercase() && s.all_bytes()[1].is_ascii_digit(), |
29 | InvalidExtension, |
30 | ["k0" ], |
31 | ["" , "k" , "0k" , "k12" ], |
32 | ); |
33 | |