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use bstr::{BStr, ByteSlice};
/// An unvalidated parse result of parsing input like `remote.origin.url` or `core.bare`.
#[derive(Debug, PartialEq, Ord, PartialOrd, Eq, Hash, Clone, Copy)]
pub struct Key<'a> {
/// The name of the section, like `core` in `core.bare`.
pub section_name: &'a str,
/// The name of the sub-section, like `origin` in `remote.origin.url`.
pub subsection_name: Option<&'a BStr>,
/// The name of the section key, like `url` in `remote.origin.url`.
pub value_name: &'a str,
}
/// Parse `input` like `core.bare` or `remote.origin.url` as a `Key` to make its fields available,
/// or `None` if there were not at least 2 tokens separated by `.`.
/// Note that `input` isn't validated, and is `str` as ascii is a subset of UTF-8 which is required for any valid keys.
pub fn parse_unvalidated<'a>(input: impl Into<&'a BStr>) -> Option<Key<'a>> {
let input = input.into();
let mut tokens = input.splitn(2, |b| *b == b'.');
let section_name = tokens.next()?;
let subsection_or_key = tokens.next()?;
let mut tokens = subsection_or_key.rsplitn(2, |b| *b == b'.');
let (subsection_name, value_name) = match (tokens.next(), tokens.next()) {
(Some(key), Some(subsection)) => (Some(subsection.into()), key),
(Some(key), None) => (None, key),
(None, Some(_)) => unreachable!("iterator can't restart producing items"),
(None, None) => return None,
};
Some(Key {
section_name: section_name.to_str().ok()?,
subsection_name,
value_name: value_name.to_str().ok()?,
})
}
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