1// Copyright 2021 the SVG Types Authors
2// SPDX-License-Identifier: Apache-2.0 OR MIT
3
4use crate::{Error, Stream};
5
6/// Representation of the [`enable-background`] attribute.
7///
8/// [`enable-background`]: https://www.w3.org/TR/SVG11/filters.html#EnableBackgroundProperty
9#[derive(Clone, Copy, PartialEq, Debug)]
10#[allow(missing_docs)]
11pub enum EnableBackground {
12 Accumulate,
13 New,
14 NewWithRegion {
15 x: f64,
16 y: f64,
17 width: f64,
18 height: f64,
19 },
20}
21
22impl std::str::FromStr for EnableBackground {
23 type Err = Error;
24
25 fn from_str(text: &str) -> Result<Self, Self::Err> {
26 let mut s = Stream::from(text);
27 s.skip_spaces();
28 if s.starts_with(b"accumulate") {
29 s.advance(10);
30 s.skip_spaces();
31 if !s.at_end() {
32 return Err(Error::UnexpectedData(s.calc_char_pos()));
33 }
34
35 Ok(EnableBackground::Accumulate)
36 } else if s.starts_with(b"new") {
37 s.advance(3);
38 s.skip_spaces();
39 if s.at_end() {
40 return Ok(EnableBackground::New);
41 }
42
43 let x = s.parse_list_number()?;
44 let y = s.parse_list_number()?;
45 let width = s.parse_list_number()?;
46 let height = s.parse_list_number()?;
47
48 s.skip_spaces();
49 if !s.at_end() {
50 return Err(Error::UnexpectedData(s.calc_char_pos()));
51 }
52
53 // Region size must be valid;
54 if !(width > 0.0 && height > 0.0) {
55 return Err(Error::InvalidValue);
56 }
57
58 Ok(EnableBackground::NewWithRegion {
59 x,
60 y,
61 width,
62 height,
63 })
64 } else {
65 Err(Error::InvalidValue)
66 }
67 }
68}
69
70#[rustfmt::skip]
71#[cfg(test)]
72mod tests {
73 use super::*;
74 use std::str::FromStr;
75
76 #[test]
77 fn parse_1() {
78 assert_eq!(EnableBackground::from_str("accumulate").unwrap(), EnableBackground::Accumulate);
79 }
80
81 #[test]
82 fn parse_2() {
83 assert_eq!(EnableBackground::from_str(" accumulate ").unwrap(), EnableBackground::Accumulate);
84 }
85
86 #[test]
87 fn parse_3() {
88 assert_eq!(EnableBackground::from_str("new").unwrap(), EnableBackground::New);
89 }
90
91 #[test]
92 fn parse_4() {
93 assert_eq!(EnableBackground::from_str(" new ").unwrap(), EnableBackground::New);
94 }
95
96 #[test]
97 fn parse_5() {
98 assert_eq!(EnableBackground::from_str("new 1 2 3 4").unwrap(),
99 EnableBackground::NewWithRegion { x: 1.0, y: 2.0, width: 3.0, height: 4.0 });
100 }
101
102 #[test]
103 fn err_1() {
104 assert_eq!(EnableBackground::from_str(" accumulate b ").unwrap_err().to_string(),
105 "unexpected data at position 13");
106 }
107
108 #[test]
109 fn err_2() {
110 assert_eq!(EnableBackground::from_str(" new b ").unwrap_err().to_string(),
111 "invalid number at position 6");
112 }
113
114 #[test]
115 fn err_3() {
116 assert_eq!(EnableBackground::from_str("new 1 2 3").unwrap_err().to_string(),
117 "unexpected end of stream");
118 }
119
120 #[test]
121 fn err_4() {
122 assert_eq!(EnableBackground::from_str("new 1 2 3 4 5").unwrap_err().to_string(),
123 "unexpected data at position 13");
124 }
125
126 #[test]
127 fn err_5() {
128 assert_eq!(EnableBackground::from_str("new 0 0 0 0").unwrap_err().to_string(),
129 "invalid value");
130 }
131}
132