markly/parser/span/
emphasis.rs

1use parser::span::parse_spans;
2use parser::Span;
3use parser::Span::Emphasis;
4use regex::Regex;
5
6pub fn parse_emphasis(text: &str) -> Option<(Span, usize)> {
7    lazy_static! {
8        static ref EMPHASIS_UNDERSCORE: Regex = Regex::new(r"^_(?P<text>.+?)_").unwrap();
9        static ref EMPHASIS_STAR: Regex = Regex::new(r"^\*(?P<text>.+?)\*").unwrap();
10    }
11
12    if EMPHASIS_UNDERSCORE.is_match(text) {
13        let caps = EMPHASIS_UNDERSCORE.captures(text).unwrap();
14        let t = caps.name("text").unwrap().as_str();
15        return Some((Emphasis(parse_spans(t)), t.len() + 2));
16    } else if EMPHASIS_STAR.is_match(text) {
17        let caps = EMPHASIS_STAR.captures(text).unwrap();
18        let t = caps.name("text").unwrap().as_str();
19        return Some((Emphasis(parse_spans(t)), t.len() + 2));
20    }
21    None
22}
23
24#[cfg(test)]
25mod test {
26    use super::parse_emphasis;
27    use parser::Span::{Emphasis, Text};
28
29    #[test]
30    fn finds_emphasis() {
31        assert_eq!(
32            parse_emphasis("_testing things_ test"),
33            Some((Emphasis(vec![Text("testing things".to_owned())]), 16))
34        );
35
36        assert_eq!(
37            parse_emphasis("*testing things* test"),
38            Some((Emphasis(vec![Text("testing things".to_owned())]), 16))
39        );
40
41        assert_eq!(
42            parse_emphasis("_testing things_ things_ test"),
43            Some((Emphasis(vec![Text("testing things".to_owned())]), 16))
44        );
45
46        assert_eq!(
47            parse_emphasis("_w_ things_ test"),
48            Some((Emphasis(vec![Text("w".to_owned())]), 3))
49        );
50
51        assert_eq!(
52            parse_emphasis("*w* things* test"),
53            Some((Emphasis(vec![Text("w".to_owned())]), 3))
54        );
55
56        assert_eq!(
57            parse_emphasis("_w__ testing things test"),
58            Some((Emphasis(vec![Text("w".to_owned())]), 3))
59        );
60    }
61
62    #[test]
63    fn no_false_positives() {
64        assert_eq!(parse_emphasis("__ testing things test"), None);
65        assert_eq!(parse_emphasis("_ test"), None);
66    }
67
68    #[test]
69    fn no_early_matching() {
70        assert_eq!(parse_emphasis("were _testing things_ test"), None);
71        assert_eq!(parse_emphasis("were *testing things* test"), None);
72    }
73}
markly/parser/span/emphasis.rs

markly/parser/span/
emphasis.rs
