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
73
74
75
76
77
78
79
80
81
use once_cell::sync::Lazy;
use regex::Regex;
use crate::{MarkdownIt, Node};
use crate::common::utils::{get_entity_from_str, is_valid_entity_code};
use crate::parser::inline::{InlineRule, InlineState, TextSpecial};
pub fn add(md: &mut MarkdownIt) {
md.inline.add_rule::<EntityScanner>();
}
static DIGITAL_RE : Lazy<Regex> = Lazy::new(|| {
Regex::new("(?i)^&#((?:x[a-f0-9]{1,6}|[0-9]{1,7}));").unwrap()
});
static NAMED_RE : Lazy<Regex> = Lazy::new(|| {
Regex::new("(?i)^&([a-z][a-z0-9]{1,31});").unwrap()
});
#[doc(hidden)]
pub struct EntityScanner;
impl InlineRule for EntityScanner {
const MARKER: char = '&';
fn run(state: &mut InlineState) -> Option<(Node, usize)> {
let mut chars = state.src[state.pos..state.pos_max].chars();
if chars.next().unwrap() != '&' { return None; }
if let Some('#') = chars.next() {
parse_digital_entity(state)
} else {
parse_named_entity(state)
}
}
}
fn parse_digital_entity(state: &mut InlineState) -> Option<(Node, usize)> {
let capture = DIGITAL_RE.captures(&state.src[state.pos..])?;
let entity_len = capture[0].len();
let entity = &capture[1];
#[allow(clippy::from_str_radix_10)]
let code = if entity.starts_with('x') || entity.starts_with('X') {
u32::from_str_radix(&entity[1..], 16).unwrap()
} else {
u32::from_str_radix(entity, 10).unwrap()
};
let content_str = if is_valid_entity_code(code) {
char::from_u32(code).unwrap().into()
} else {
'\u{FFFD}'.into()
};
let markup_str = capture[0].to_owned();
let node = Node::new(TextSpecial {
content: content_str,
markup: markup_str,
info: "entity",
});
Some((node, entity_len))
}
fn parse_named_entity(state: &mut InlineState) -> Option<(Node, usize)> {
let capture = NAMED_RE.captures(&state.src[state.pos..])?;
let str = get_entity_from_str(&capture[0])?;
let entity_len = capture[0].len();
let markup_str = capture[0].to_owned();
let content_str = (*str).to_owned();
let node = Node::new(TextSpecial {
content: content_str,
markup: markup_str,
info: "entity",
});
Some((node, entity_len))
}
