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
10use alloc::string::String;
11
12/// A trait for types which can be converted to an attribute value.
13pub trait IntoAttributeValue {
14    /// Turns this into an attribute string, or None if it shouldn't be added.
15    fn into_attribute_value(self) -> Option<String>;
16}
17
18macro_rules! impl_into_attribute_value {
19    ($t:ty) => {
20        impl IntoAttributeValue for $t {
21            fn into_attribute_value(self) -> Option<String> {
22                Some(self.to_string())
23            }
24        }
25    };
26}
27
28macro_rules! impl_into_attribute_values {
29    ($($t:ty),*) => {
30        $(impl_into_attribute_value!($t);)*
31    }
32}
33
34impl_into_attribute_values!(
35    usize,
36    u64,
37    u32,
38    u16,
39    u8,
40    isize,
41    i64,
42    i32,
43    i16,
44    i8,
45    ::core::net::IpAddr
46);
47
48impl IntoAttributeValue for String {
49    fn into_attribute_value(self) -> Option<String> {
50        Some(self)
51    }
52}
53
54impl IntoAttributeValue for &String {
55    fn into_attribute_value(self) -> Option<String> {
56        Some(self.to_owned())
57    }
58}
59
60impl IntoAttributeValue for &str {
61    fn into_attribute_value(self) -> Option<String> {
62        Some(self.to_owned())
63    }
64}
65
66impl<T: IntoAttributeValue> IntoAttributeValue for Option<T> {
67    fn into_attribute_value(self) -> Option<String> {
68        self.and_then(IntoAttributeValue::into_attribute_value)
69    }
70}
71
72#[cfg(test)]
73mod tests {
74    use super::IntoAttributeValue;
75    use core::net::IpAddr;
76    use core::str::FromStr;
77
78    #[test]
79    fn test_into_attribute_value_on_ints() {
80        assert_eq!(16u8.into_attribute_value().unwrap(), "16");
81        assert_eq!(17u16.into_attribute_value().unwrap(), "17");
82        assert_eq!(18u32.into_attribute_value().unwrap(), "18");
83        assert_eq!(19u64.into_attribute_value().unwrap(), "19");
84        assert_eq!(16i8.into_attribute_value().unwrap(), "16");
85        assert_eq!((-17i16).into_attribute_value().unwrap(), "-17");
86        assert_eq!(18i32.into_attribute_value().unwrap(), "18");
87        assert_eq!((-19i64).into_attribute_value().unwrap(), "-19");
88        assert_eq!(
89            IpAddr::from_str("0000:0::1")
90                .unwrap()
91                .into_attribute_value()
92                .unwrap(),
93            "::1"
94        );
95    }
96}
minidom/convert.rs

minidom/
convert.rs
