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use std::fmt;
use std::num::ParseIntError;
use std::str::FromStr;
#[cfg(test)]
mod tests;
pub const VERSION_PLACEHOLDER: &str = "CURRENT_RUSTC_VERSION";
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
pub enum Version {
Explicit { parts: [u32; 3] },
CurrentPlaceholder,
}
impl fmt::Display for Version {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Version::Explicit { parts } => {
f.pad(&format!("{}.{}.{}", parts[0], parts[1], parts[2]))
}
Version::CurrentPlaceholder => f.pad(&format!("CURRENT")),
}
}
}
#[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> {
if s == VERSION_PLACEHOLDER {
return Ok(Version::CurrentPlaceholder);
}
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(Version::Explicit { parts })
}
}
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