1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
use crate;
use crate Named;
/// The number of [Unicode scalar values](https://www.unicode.org/glossary/#unicode_scalar_value).
///
/// $2^{20}+2^{16}-2^{11} = \mathrm{0x10\\,f800} = 1,\\!112,\\!064$.
pub const NUMBER_OF_CHARS: u32 = + - NUMBER_OF_SURROGATE_CODE_POINTS;
/// The number of [surrogate code points](https://www.unicode.org/glossary/#surrogate_code_point);
/// these are code points that do not correspond to any valid [`char`].
///
/// $2^{11} = 2,\\!048$.
pub const NUMBER_OF_SURROGATE_CODE_POINTS: u32 = 1 << 11;
/// The first [surrogate code point](https://www.unicode.org/glossary/#surrogate_code_point).
pub const FIRST_SURROGATE_CODE_POINT: u32 = 0xd800;
/// The [`char`] that comes just before the surrogate range.
///
/// This happens to be an unassigned (as of Unicode 14.0) character in the
/// [Hangul Jamo Extended-B block](https://www.unicode.org/charts/PDF/UD7B0.pdf).
pub const CHAR_JUST_BELOW_SURROGATES: char = '\u{d7ff}';
/// The [`char`] that comes just after the surrogate range.
///
/// This is a character in the [Private Use Area](https://www.unicode.org/charts/PDF/UE000.pdf).
pub const CHAR_JUST_ABOVE_SURROGATES: char = '\u{e000}';
impl_named!;