minidom/
convert.rs

1// Copyright (c) 2020 lumi <lumi@pew.im>
2// Copyright (c) 2020 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
3//
4// This Source Code Form is subject to the terms of the Mozilla Public
5// License, v. 2.0. If a copy of the MPL was not distributed with this
6// file, You can obtain one at http://mozilla.org/MPL/2.0/.
7
8//! A module which exports a few traits for converting types to elements and attributes.
9
10/// A trait for types which can be converted to an attribute value.
11pub trait IntoAttributeValue {
12    /// Turns this into an attribute string, or None if it shouldn't be added.
13    fn into_attribute_value(self) -> Option<String>;
14}
15
16macro_rules! impl_into_attribute_value {
17    ($t:ty) => {
18        impl IntoAttributeValue for $t {
19            fn into_attribute_value(self) -> Option<String> {
20                Some(format!("{}", self))
21            }
22        }
23    };
24}
25
26macro_rules! impl_into_attribute_values {
27    ($($t:ty),*) => {
28        $(impl_into_attribute_value!($t);)*
29    }
30}
31
32impl_into_attribute_values!(
33    usize,
34    u64,
35    u32,
36    u16,
37    u8,
38    isize,
39    i64,
40    i32,
41    i16,
42    i8,
43    ::core::net::IpAddr
44);
45
46impl IntoAttributeValue for String {
47    fn into_attribute_value(self) -> Option<String> {
48        Some(self)
49    }
50}
51
52impl IntoAttributeValue for &String {
53    fn into_attribute_value(self) -> Option<String> {
54        Some(self.to_owned())
55    }
56}
57
58impl IntoAttributeValue for &str {
59    fn into_attribute_value(self) -> Option<String> {
60        Some(self.to_owned())
61    }
62}
63
64impl<T: IntoAttributeValue> IntoAttributeValue for Option<T> {
65    fn into_attribute_value(self) -> Option<String> {
66        self.and_then(IntoAttributeValue::into_attribute_value)
67    }
68}
69
70#[cfg(test)]
71mod tests {
72    use super::IntoAttributeValue;
73    use core::net::IpAddr;
74    use core::str::FromStr;
75
76    #[test]
77    fn test_into_attribute_value_on_ints() {
78        assert_eq!(16u8.into_attribute_value().unwrap(), "16");
79        assert_eq!(17u16.into_attribute_value().unwrap(), "17");
80        assert_eq!(18u32.into_attribute_value().unwrap(), "18");
81        assert_eq!(19u64.into_attribute_value().unwrap(), "19");
82        assert_eq!(16i8.into_attribute_value().unwrap(), "16");
83        assert_eq!((-17i16).into_attribute_value().unwrap(), "-17");
84        assert_eq!(18i32.into_attribute_value().unwrap(), "18");
85        assert_eq!((-19i64).into_attribute_value().unwrap(), "-19");
86        assert_eq!(
87            IpAddr::from_str("0000:0::1")
88                .unwrap()
89                .into_attribute_value()
90                .unwrap(),
91            "::1"
92        );
93    }
94}
minidom/convert.rs

minidom/
convert.rs
