rsvg/
dasharray.rs

1//! Parser for the `stroke-dasharray` property.
2
3use cssparser::Parser;
4
5use crate::error::*;
6use crate::length::*;
7use crate::parsers::{Parse, optional_comma};
8
9#[derive(Debug, Default, PartialEq, Clone)]
10pub enum Dasharray {
11    #[default]
12    None,
13    Array(Box<[ULength<Both>]>),
14}
15
16impl Parse for Dasharray {
17    fn parse<'i>(parser: &mut Parser<'i, '_>) -> Result<Dasharray, ParseError<'i>> {
18        if parser
19            .try_parse(|p| p.expect_ident_matching("none"))
20            .is_ok()
21        {
22            return Ok(Dasharray::None);
23        }
24
25        let mut dasharray = Vec::new();
26
27        loop {
28            let d = ULength::<Both>::parse(parser)?;
29            dasharray.push(d);
30
31            if parser.is_exhausted() {
32                break;
33            }
34
35            optional_comma(parser);
36        }
37
38        Ok(Dasharray::Array(dasharray.into_boxed_slice()))
39    }
40}
41
42#[cfg(test)]
43mod tests {
44    use super::*;
45
46    fn dasharray(l: &[ULength<Both>]) -> Dasharray {
47        Dasharray::Array(l.to_vec().into_boxed_slice())
48    }
49
50    #[test]
51    fn parses_dash_array() {
52        // helper to cut down boilderplate
53        let length_parse = |s| ULength::<Both>::parse_str(s).unwrap();
54
55        let expected = dasharray(&[
56            length_parse("1"),
57            length_parse("2in"),
58            length_parse("3"),
59            length_parse("4%"),
60        ]);
61
62        let sample_1 = dasharray(&[length_parse("10"), length_parse("6")]);
63
64        let sample_2 = dasharray(&[length_parse("5"), length_parse("5"), length_parse("20")]);
65
66        let sample_3 = dasharray(&[
67            length_parse("10px"),
68            length_parse("20px"),
69            length_parse("20px"),
70        ]);
71
72        let sample_4 = dasharray(&[
73            length_parse("25"),
74            length_parse("5"),
75            length_parse("5"),
76            length_parse("5"),
77        ]);
78
79        let sample_5 = dasharray(&[length_parse("3.1415926"), length_parse("8")]);
80        let sample_6 = dasharray(&[length_parse("5"), length_parse("3.14")]);
81        let sample_7 = dasharray(&[length_parse("2")]);
82
83        assert_eq!(Dasharray::parse_str("none").unwrap(), Dasharray::None);
84        assert_eq!(Dasharray::parse_str("1 2in,3 4%").unwrap(), expected);
85        assert_eq!(Dasharray::parse_str("10,6").unwrap(), sample_1);
86        assert_eq!(Dasharray::parse_str("5,5,20").unwrap(), sample_2);
87        assert_eq!(Dasharray::parse_str("10px 20px 20px").unwrap(), sample_3);
88        assert_eq!(Dasharray::parse_str("25  5 , 5 5").unwrap(), sample_4);
89        assert_eq!(Dasharray::parse_str("3.1415926,8").unwrap(), sample_5);
90        assert_eq!(Dasharray::parse_str("5, 3.14").unwrap(), sample_6);
91        assert_eq!(Dasharray::parse_str("2").unwrap(), sample_7);
92
93        // Negative numbers
94        assert!(Dasharray::parse_str("20,40,-20").is_err());
95
96        // Empty dash_array
97        assert!(Dasharray::parse_str("").is_err());
98        assert!(Dasharray::parse_str("\t  \n     ").is_err());
99        assert!(Dasharray::parse_str(",,,").is_err());
100        assert!(Dasharray::parse_str("10,  \t, 20 \n").is_err());
101
102        // No trailing commas allowed, parse error
103        assert!(Dasharray::parse_str("10,").is_err());
104
105        // A comma should be followed by a number
106        assert!(Dasharray::parse_str("20,,10").is_err());
107    }
108}
rsvg/dasharray.rs

rsvg/
dasharray.rs
