svgrtypes/
enable_background.rs

1use crate::{Error, Stream};
2
3/// Representation of the [`enable-background`] attribute.
4///
5/// [`enable-background`]: https://www.w3.org/TR/SVG11/filters.html#EnableBackgroundProperty
6#[derive(Clone, Copy, PartialEq, Debug)]
7#[allow(missing_docs)]
8pub enum EnableBackground {
9    Accumulate,
10    New,
11    NewWithRegion {
12        x: f64,
13        y: f64,
14        width: f64,
15        height: f64,
16    },
17}
18
19impl std::str::FromStr for EnableBackground {
20    type Err = Error;
21
22    fn from_str(text: &str) -> Result<Self, Self::Err> {
23        let mut s = Stream::from(text);
24        s.skip_spaces();
25        if s.starts_with(b"accumulate") {
26            s.advance(10);
27            s.skip_spaces();
28            if !s.at_end() {
29                return Err(Error::UnexpectedData(s.calc_char_pos()));
30            }
31
32            Ok(EnableBackground::Accumulate)
33        } else if s.starts_with(b"new") {
34            s.advance(3);
35            s.skip_spaces();
36            if s.at_end() {
37                return Ok(EnableBackground::New);
38            }
39
40            let x = s.parse_list_number()?;
41            let y = s.parse_list_number()?;
42            let width = s.parse_list_number()?;
43            let height = s.parse_list_number()?;
44
45            s.skip_spaces();
46            if !s.at_end() {
47                return Err(Error::UnexpectedData(s.calc_char_pos()));
48            }
49
50            // Region size must be valid;
51            if !(width > 0.0 && height > 0.0) {
52                return Err(Error::InvalidValue);
53            }
54
55            Ok(EnableBackground::NewWithRegion {
56                x,
57                y,
58                width,
59                height,
60            })
61        } else {
62            Err(Error::InvalidValue)
63        }
64    }
65}
66
67#[rustfmt::skip]
68#[cfg(test)]
69mod tests {
70    use super::*;
71    use std::str::FromStr;
72
73    #[test]
74    fn parse_1() {
75        assert_eq!(EnableBackground::from_str("accumulate").unwrap(), EnableBackground::Accumulate);
76    }
77
78    #[test]
79    fn parse_2() {
80        assert_eq!(EnableBackground::from_str("  accumulate  ").unwrap(), EnableBackground::Accumulate);
81    }
82
83    #[test]
84    fn parse_3() {
85        assert_eq!(EnableBackground::from_str("new").unwrap(), EnableBackground::New);
86    }
87
88    #[test]
89    fn parse_4() {
90        assert_eq!(EnableBackground::from_str("  new  ").unwrap(), EnableBackground::New);
91    }
92
93    #[test]
94    fn parse_5() {
95        assert_eq!(EnableBackground::from_str("new 1 2 3 4").unwrap(),
96                   EnableBackground::NewWithRegion { x: 1.0, y: 2.0, width: 3.0, height: 4.0 });
97    }
98
99    #[test]
100    fn err_1() {
101        assert_eq!(EnableBackground::from_str(" accumulate b ").unwrap_err().to_string(),
102                   "unexpected data at position 13");
103    }
104
105    #[test]
106    fn err_2() {
107        assert_eq!(EnableBackground::from_str(" new b ").unwrap_err().to_string(),
108                   "invalid number at position 6");
109    }
110
111    #[test]
112    fn err_3() {
113        assert_eq!(EnableBackground::from_str("new 1 2 3").unwrap_err().to_string(),
114                   "unexpected end of stream");
115    }
116
117    #[test]
118    fn err_4() {
119        assert_eq!(EnableBackground::from_str("new 1 2 3 4 5").unwrap_err().to_string(),
120                   "unexpected data at position 13");
121    }
122
123    #[test]
124    fn err_5() {
125        assert_eq!(EnableBackground::from_str("new 0 0 0 0").unwrap_err().to_string(),
126                   "invalid value");
127    }
128}
svgrtypes/enable_background.rs

svgrtypes/
enable_background.rs
