markdown_it/plugins/cmark/inline/
escape.rs

1//! Backslash escapes
2//!
3//! Allows escapes like `\*hello*`, also processes hard breaks at the end
4//! of the line.
5//!
6//! <https://spec.commonmark.org/0.30/#backslash-escapes>
7use crate::parser::inline::{InlineRule, InlineState, TextSpecial};
8use crate::plugins::cmark::inline::newline::Hardbreak;
9use crate::{MarkdownIt, Node};
10
11pub fn add(md: &mut MarkdownIt) {
12    md.inline.add_rule::<EscapeScanner>();
13}
14
15#[doc(hidden)]
16pub struct EscapeScanner;
17impl InlineRule for EscapeScanner {
18    const MARKER: char = '\\';
19
20    fn run(state: &mut InlineState) -> Option<(Node, usize)> {
21        let mut chars = state.src[state.pos..state.pos_max].chars();
22        if chars.next().unwrap() != '\\' { return None; }
23
24        match chars.next() {
25            Some('\n') => {
26                // skip leading whitespaces from next line
27                let mut len = 2;
28                while let Some(' ' | '\t') = chars.next() {
29                    len += 1;
30                }
31                Some((Node::new(Hardbreak), len))
32            }
33            Some(chr) => {
34                let start = state.pos;
35                let end = state.pos + 1 + chr.len_utf8();
36
37                let mut orig_str = "\\".to_owned();
38                orig_str.push(chr);
39
40                let content_str = match chr {
41                    '\\' | '!' | '"' | '#' | '$' | '%' | '&' | '\'' | '(' | ')' |
42                    '*' | '+' | ',' | '.' | '/' | ':' | ';' | '<' | '=' | '>' | '?' |
43                    '@' | '[' | ']' | '^' | '_' | '`' | '{' | '|' | '}' | '~' | '-' => chr.into(),
44                    _ => orig_str.clone()
45                };
46
47                let node = Node::new(TextSpecial {
48                    content: content_str,
49                    markup: orig_str,
50                    info: "escape",
51                });
52                Some((node, end - start))
53            }
54            None => None
55        }
56    }
57}
markdown_it/plugins/cmark/inline/escape.rs

markdown_it/plugins/cmark/inline/
escape.rs
