xmpp-rs/minidom-rs/src/convert.rs
Maxime “pep” Buquet a104ebc3f6
Rustfmt pass, and rustfmt --check in CI"
Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>
2019-10-23 01:36:02 +02:00

87 lines
2.3 KiB
Rust

//! A module which exports a few traits for converting types to elements and attributes.
/// A trait for types which can be converted to an attribute value.
pub trait IntoAttributeValue {
/// Turns this into an attribute string, or None if it shouldn't be added.
fn into_attribute_value(self) -> Option<String>;
}
macro_rules! impl_into_attribute_value {
($t:ty) => {
impl IntoAttributeValue for $t {
fn into_attribute_value(self) -> Option<String> {
Some(format!("{}", self))
}
}
};
}
macro_rules! impl_into_attribute_values {
($($t:ty),*) => {
$(impl_into_attribute_value!($t);)*
}
}
impl_into_attribute_values!(
usize,
u64,
u32,
u16,
u8,
isize,
i64,
i32,
i16,
i8,
::std::net::IpAddr
);
impl IntoAttributeValue for String {
fn into_attribute_value(self) -> Option<String> {
Some(self)
}
}
impl<'a> IntoAttributeValue for &'a String {
fn into_attribute_value(self) -> Option<String> {
Some(self.to_owned())
}
}
impl<'a> IntoAttributeValue for &'a str {
fn into_attribute_value(self) -> Option<String> {
Some(self.to_owned())
}
}
impl<T: IntoAttributeValue> IntoAttributeValue for Option<T> {
fn into_attribute_value(self) -> Option<String> {
self.and_then(IntoAttributeValue::into_attribute_value)
}
}
#[cfg(test)]
mod tests {
use super::IntoAttributeValue;
use std::net::IpAddr;
use std::str::FromStr;
#[test]
fn test_into_attribute_value_on_ints() {
assert_eq!(16u8.into_attribute_value().unwrap(), "16");
assert_eq!(17u16.into_attribute_value().unwrap(), "17");
assert_eq!(18u32.into_attribute_value().unwrap(), "18");
assert_eq!(19u64.into_attribute_value().unwrap(), "19");
assert_eq!(16i8.into_attribute_value().unwrap(), "16");
assert_eq!((-17i16).into_attribute_value().unwrap(), "-17");
assert_eq!(18i32.into_attribute_value().unwrap(), "18");
assert_eq!((-19i64).into_attribute_value().unwrap(), "-19");
assert_eq!(
IpAddr::from_str("127.000.0.1")
.unwrap()
.into_attribute_value()
.unwrap(),
"127.0.0.1"
);
}
}