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//! Contains XML attributes manipulation types and functions.
//!
use std::fmt;
use name::{Name, OwnedName};
use escape::escape_str_attribute;
/// A borrowed version of an XML attribute.
///
/// Consists of a borrowed qualified name and a borrowed string value.
#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
pub struct Attribute<'a> {
/// Attribute name.
pub name: Name<'a>,
/// Attribute value.
pub value: &'a str
}
impl<'a> fmt::Display for Attribute<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}=\"{}\"", self.name, escape_str_attribute(self.value))
}
}
impl<'a> Attribute<'a> {
/// Creates an owned attribute out of this borrowed one.
#[inline]
pub fn to_owned(&self) -> OwnedAttribute {
OwnedAttribute {
name: self.name.into(),
value: self.value.into(),
}
}
/// Creates a borrowed attribute using the provided borrowed name and a borrowed string value.
#[inline]
pub fn new(name: Name<'a>, value: &'a str) -> Attribute<'a> {
Attribute { name, value, }
}
}
/// An owned version of an XML attribute.
///
/// Consists of an owned qualified name and an owned string value.
#[derive(Clone, Eq, PartialEq, Hash, Debug)]
pub struct OwnedAttribute {
/// Attribute name.
pub name: OwnedName,
/// Attribute value.
pub value: String
}
impl OwnedAttribute {
/// Returns a borrowed `Attribute` out of this owned one.
pub fn borrow(&self) -> Attribute {
Attribute {
name: self.name.borrow(),
value: &*self.value,
}
}
/// Creates a new owned attribute using the provided owned name and an owned string value.
#[inline]
pub fn new<S: Into<String>>(name: OwnedName, value: S) -> OwnedAttribute {
OwnedAttribute {
name,
value: value.into(),
}
}
}
impl fmt::Display for OwnedAttribute {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}=\"{}\"", self.name, escape_str_attribute(&*self.value))
}
}
#[cfg(test)]
mod tests {
use super::{Attribute};
use name::Name;
#[test]
fn attribute_display() {
let attr = Attribute::new(
Name::qualified("attribute", "urn:namespace", Some("n")),
"its value with > & \" ' < weird symbols"
);
assert_eq!(
&*attr.to_string(),
"{urn:namespace}n:attribute=\"its value with > & " ' < weird symbols\""
)
}
}