Function parse_clearable_value

alpm-srcinfo/src/pkgbuild_bridge/package.rs:174–192

Ensures that a combination of [`Keyword`] and [`ClearableValue`] uses a [`ClearableValue::Single`] and parses the value as a specific type. # Errors Returns an error if - `value` cannot be parsed as a specific type, - or `value` is a [`ClearableValue::Array`].

(
    keyword: &Keyword,
    value: &'a ClearableValue,
    mut parser: P,
)

///
/// Returns an error if
///
/// - `value` cannot be parsed as a specific type,
/// - or `value` is a [`ClearableValue::Array`].
fn parse_clearable_value<'a, O, P: Parser<&'a str, O, ErrMode<ContextError>>>(
    keyword: &Keyword,
    value: &'a ClearableValue,
    mut parser: P,
) -> Result<Override<O>, BridgeError> {
    // Make sure we have no array
    let value = ensure_single_clearable_value(keyword, value)?;

    // If the value is `None`, it indicates a cleared value.
    let Some(value) = value else {
        return Ok(Override::Clear);
    };

    let parsed_value = parser.parse(value).map_err(|err| (keyword.clone(), err))?;

    Ok(Override::Yes {
        value: parsed_value,
    })
}