1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159

use crate::{Error, Stream};

/// Representation of the [`<IRI>`] type.
///
/// [`<IRI>`]: https://www.w3.org/TR/SVG11/types.html#DataTypeIRI
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub struct IRI<'a>(pub &'a str);

impl<'a> IRI<'a> {
    /// Parsers a `IRI` from a string.
    ///
    /// By the SVG spec, the ID must contain only [Name] characters,
    /// but since no one fallows this it will parse any characters.
    ///
    /// We can't use the `FromStr` trait because it requires
    /// an owned value as a return type.
    ///
    /// [Name]: https://www.w3.org/TR/xml/#NT-Name
    #[allow(clippy::should_implement_trait)]
    pub fn from_str(text: &'a str) -> Result<Self, Error> {
        let mut s = Stream::from(text);
        let link = s.parse_iri()?;
        s.skip_spaces();
        if !s.at_end() {
            return Err(Error::UnexpectedData(s.calc_char_pos()));
        }

        Ok(Self(link))
    }
}

/// Representation of the [`<FuncIRI>`] type.
///
/// [`<FuncIRI>`]: https://www.w3.org/TR/SVG11/types.html#DataTypeFuncIRI
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub struct FuncIRI<'a>(pub &'a str);

impl<'a> FuncIRI<'a> {
    /// Parsers a `FuncIRI` from a string.
    ///
    /// By the SVG spec, the ID must contain only [Name] characters,
    /// but since no one fallows this it will parse any characters.
    ///
    /// We can't use the `FromStr` trait because it requires
    /// an owned value as a return type.
    ///
    /// [Name]: https://www.w3.org/TR/xml/#NT-Name
    #[allow(clippy::should_implement_trait)]
    pub fn from_str(text: &'a str) -> Result<Self, Error> {
        let mut s = Stream::from(text);
        let link = s.parse_func_iri()?;
        s.skip_spaces();
        if !s.at_end() {
            return Err(Error::UnexpectedData(s.calc_char_pos()));
        }

        Ok(Self(link))
    }
}

impl<'a> Stream<'a> {
    pub fn parse_iri(&mut self) -> Result<&'a str, Error> {
        self.skip_spaces();
        self.consume_byte(b'#')?;
        let link = self.consume_bytes(|_, c| c != b' ');
        if link.is_empty() {
            return Err(Error::InvalidValue);
        }
        Ok(link)
    }

    pub fn parse_func_iri(&mut self) -> Result<&'a str, Error> {
        self.skip_spaces();
        self.consume_string(b"url(")?;
        self.skip_spaces();
        self.consume_byte(b'#')?;
        let link = self.consume_bytes(|_, c| c != b' ' && c != b')');
        if link.is_empty() {
            return Err(Error::InvalidValue);
        }
        self.skip_spaces();
        self.consume_byte(b')')?;
        Ok(link)
    }
}

#[rustfmt::skip]
#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn parse_iri_1() {
        assert_eq!(IRI::from_str("#id").unwrap(), IRI("id"));
    }

    #[test]
    fn parse_iri_2() {
        assert_eq!(IRI::from_str("   #id   ").unwrap(), IRI("id"));
    }

    #[test]
    fn parse_iri_3() {
        // Trailing data is ok for the Stream, by not for IRI.
        assert_eq!(Stream::from("   #id   text").parse_iri().unwrap(), "id");
        assert_eq!(IRI::from_str("   #id   text").unwrap_err().to_string(),
                   "unexpected data at position 10");
    }

    #[test]
    fn parse_iri_4() {
        assert_eq!(IRI::from_str("#1").unwrap(), IRI("1"));
    }

    #[test]
    fn parse_err_iri_1() {
        assert_eq!(IRI::from_str("# id").unwrap_err().to_string(), "invalid value");
    }

    #[test]
    fn parse_func_iri_1() {
        assert_eq!(FuncIRI::from_str("url(#id)").unwrap(), FuncIRI("id"));
    }

    #[test]
    fn parse_func_iri_2() {
        assert_eq!(FuncIRI::from_str("url(#1)").unwrap(), FuncIRI("1"));
    }

    #[test]
    fn parse_func_iri_3() {
        assert_eq!(FuncIRI::from_str("    url(    #id    )   ").unwrap(), FuncIRI("id"));
    }

    #[test]
    fn parse_func_iri_4() {
        // Trailing data is ok for the Stream, by not for FuncIRI.
        assert_eq!(Stream::from("url(#id) qwe").parse_func_iri().unwrap(), "id");
        assert_eq!(FuncIRI::from_str("url(#id) qwe").unwrap_err().to_string(),
                   "unexpected data at position 10");
    }

    #[test]
    fn parse_err_func_iri_1() {
        assert_eq!(FuncIRI::from_str("url ( #1 )").unwrap_err().to_string(),
                   "expected 'url(' not 'url ' at position 1");
    }

    #[test]
    fn parse_err_func_iri_2() {
        assert_eq!(FuncIRI::from_str("url(#)").unwrap_err().to_string(), "invalid value");
    }

    #[test]
    fn parse_err_func_iri_3() {
        assert_eq!(FuncIRI::from_str("url(# id)").unwrap_err().to_string(),
                   "invalid value");
    }
}