blob: 79ed46a2274a5cca3fb4cd00e3576c3a2374c75b (
plain) (
blame)
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
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
//! Utilities to classify characters as whitespace, punctuation, or rest.
use crate::util::unicode::PUNCTUATION;
/// Character kinds.
#[derive(Debug, PartialEq, Eq)]
pub enum Kind {
/// Whitespace.
///
/// ## Example
///
/// ```markdown
/// > | **a_b_ c**.
/// ^ ^ ^
/// ```
Whitespace,
/// Punctuation.
///
/// ## Example
///
/// ```markdown
/// > | **a_b_ c**.
/// ^^ ^ ^ ^
/// ```
Punctuation,
/// Everything else.
///
/// ## Example
///
/// ```markdown
/// > | **a_b_ c**.
/// ^ ^ ^
/// ```
Other,
}
/// Classify whether a character code represents whitespace, punctuation, or
/// something else.
///
/// Used for attention (emphasis, strong), whose sequences can open or close
/// based on the class of surrounding characters.
///
/// > 👉 **Note** that eof (`None`) is seen as whitespace.
///
/// ## References
///
/// * [`micromark-util-classify-character` in `micromark`](https://github.com/micromark/micromark/blob/main/packages/micromark-util-classify-character/dev/index.js)
pub fn classify(char: char) -> Kind {
// Unicode whitespace.
if char.is_whitespace() {
Kind::Whitespace
}
// Unicode punctuation.
else if PUNCTUATION.contains(&char) {
Kind::Punctuation
}
// Everything else.
else {
Kind::Other
}
}
/// Like [`classify`], but supports eof as whitespace.
pub fn classify_opt(char_opt: Option<char>) -> Kind {
if let Some(char) = char_opt {
classify(char)
}
// EOF.
else {
Kind::Whitespace
}
}
|
