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use std::ops::RangeInclusive;
/// Version strings can be broken up into Parts.
/// One Part represents either a string of digits or characters.
/// '.' and '_' represent deviders between parts and are not included in any part.
#[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Debug)]
pub enum VersionPart<'a> {
Word(&'a str),
Number(u64),
}
/// Type used to hold information about a VersionPart during creation
enum InternalPart {
Number { range: RangeInclusive<usize> },
Word { range: RangeInclusive<usize> },
Break,
}
/// An iterator which yields the parts of a version string.
///
/// This can then be directly used to compare two versions
pub struct VersionPartsIter<'a> {
cached_part: InternalPart,
iter: std::str::CharIndices<'a>,
version: &'a str,
}
impl<'a> VersionPartsIter<'a> {
pub fn new(version: &'a str) -> Self {
Self {
cached_part: InternalPart::Break,
iter: version.char_indices(),
version,
}
}
}
impl<'a> Iterator for VersionPartsIter<'a> {
type Item = VersionPart<'a>;
fn next(&mut self) -> Option<Self::Item> {
let char = self.iter.next();
if char.is_none() {
let cached_part = std::mem::replace(&mut self.cached_part, InternalPart::Break);
match cached_part {
InternalPart::Break => return None,
InternalPart::Number { range } => {
return Some(VersionPart::Number(self.version[range].parse().unwrap()))
}
InternalPart::Word { range } => {
return Some(VersionPart::Word(&self.version[range]))
}
}
}
let (pos, char) = char.unwrap();
match char {
// Divider encountered
'.' | '-' => {
let cached_part = std::mem::replace(&mut self.cached_part, InternalPart::Break);
match cached_part {
InternalPart::Number { range } => {
Some(VersionPart::Number(self.version[range].parse().unwrap()))
}
InternalPart::Word { range } => Some(VersionPart::Word(&self.version[range])),
InternalPart::Break => self.next(),
}
}
// digit encountered
_ if char.is_ascii_digit() => {
let cached_part = std::mem::replace(
&mut self.cached_part,
InternalPart::Number { range: pos..=pos },
);
match cached_part {
InternalPart::Number { range } => {
self.cached_part = InternalPart::Number {
range: *range.start()..=*range.end() + 1,
};
self.next()
}
InternalPart::Word { range } => Some(VersionPart::Word(&self.version[range])),
InternalPart::Break => self.next(),
}
}
// char encountered
_ => {
let mut cached_part = InternalPart::Word { range: pos..=pos };
std::mem::swap(&mut cached_part, &mut self.cached_part);
match cached_part {
InternalPart::Word { range } => {
self.cached_part = InternalPart::Word {
range: *range.start()..=*range.end() + char.len_utf8(),
};
self.next()
}
InternalPart::Number { range } => {
Some(VersionPart::Number(self.version[range].parse().unwrap()))
}
InternalPart::Break => self.next(),
}
}
}
}
}
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