/
version.rs
48 lines (37 loc) · 1.15 KB
/
version.rs
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use std::fmt;
use std::num::ParseIntError;
use std::str::FromStr;
#[cfg(test)]
mod tests;
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub struct Version {
parts: [u32; 3],
}
impl fmt::Display for Version {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.pad(&format!("{}.{}.{}", self.parts[0], self.parts[1], self.parts[2]))
}
}
#[derive(Debug, PartialEq, Eq)]
pub enum ParseVersionError {
ParseIntError(ParseIntError),
WrongNumberOfParts,
}
impl From<ParseIntError> for ParseVersionError {
fn from(err: ParseIntError) -> Self {
ParseVersionError::ParseIntError(err)
}
}
impl FromStr for Version {
type Err = ParseVersionError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let mut iter = s.split('.').map(|part| Ok(part.parse()?));
let mut part = || iter.next().unwrap_or(Err(ParseVersionError::WrongNumberOfParts));
let parts = [part()?, part()?, part()?];
if iter.next().is_some() {
// Ensure we don't have more than 3 parts.
return Err(ParseVersionError::WrongNumberOfParts);
}
Ok(Self { parts })
}
}