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use crate::Error;
use minidom::Element;
use std::str::FromStr;
pub trait AttributeElementExt {
fn try_attribute<F>(&self, attr_name: &str) -> Result<F, Error>
where
F: FromStr,
F::Err: std::error::Error + Send + Sync + 'static;
fn attribute<F>(&self, attr_name: &str) -> Option<F>
where
F: FromStr,
F::Err: std::error::Error + Send + Sync + 'static,
{
self.try_attribute(attr_name).ok()
}
}
impl AttributeElementExt for Element {
fn try_attribute<F>(&self, attr_name: &str) -> Result<F, Error>
where
F: FromStr,
F::Err: std::error::Error + Send + Sync + 'static,
{
let value = self.attr(attr_name).ok_or_else(|| {
Error::AttributeNotFound(self.name().to_owned(), attr_name.to_owned())
})?;
value.parse().map_err(|e: F::Err| Error::ParseError {
element_name: self.name().to_owned(),
attribute_name: attr_name.to_owned(),
value: value.to_owned(),
source: e.into(),
})
}
}
#[cfg(test)]
mod tests {
use super::*;
use pretty_assertions::assert_eq;
#[test]
fn no_attribute() {
let xml: &'static str = r#"<root />"#;
let root: Element = xml.parse().unwrap();
let error = root.try_attribute::<String>("id").unwrap_err();
assert_eq!(
"Failed to find attribute \'id\' in element \'root\'",
format!("{}", error)
);
}
#[test]
fn no_children() {
let xml: &'static str = r#"<root id="root:1" />"#;
let root: Element = xml.parse().unwrap();
let error = root.try_attribute::<f64>("id").unwrap_err();
assert_eq!("Failed to parse and convert the value \'root:1\' of attribute \'id\' in element \'root\'", format!("{}", error));
}
}