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use std::fmt;
pub enum Version {
Latest,
Minor(u32, u32),
Revision(u32, u32, u32),
Hash(String),
}
impl<'a> From<&'a str> for Version {
fn from(version: &'a str) -> Self {
match version.split('.').map(|p| p.parse::<u32>()).collect() {
Ok(parts) => {
let ver_parts: Vec<u32> = parts;
match ver_parts.len() {
3 => Version::Revision(ver_parts[0], ver_parts[1], ver_parts[2]),
2 => Version::Minor(ver_parts[0], ver_parts[1]),
_ => Version::Hash(version.into()),
}
}
_ => Version::Hash(version.into()),
}
}
}
impl From<(u32, u32)> for Version {
fn from(version: (u32, u32)) -> Self {
Version::Minor(version.0, version.1)
}
}
impl From<(u32, u32, u32)> for Version {
fn from(version: (u32, u32, u32)) -> Self {
Version::Revision(version.0, version.1, version.2)
}
}
impl fmt::Display for Version {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
Version::Latest => write!(f, "latest"),
Version::Minor(major, minor) => write!(f, "{}.{}", major, minor),
Version::Revision(major, minor, revision) => {
write!(f, "{}.{}.{}", major, minor, revision)
}
Version::Hash(ref hash) => write!(f, "{}", hash),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_latest_string() {
let version = Version::Latest;
assert_eq!(version.to_string(), format!("{}", version));
assert_eq!(&*version.to_string(), "latest");
}
#[test]
fn test_revision_string() {
let version = Version::Revision(1, 2, 3);
assert_eq!(version.to_string(), format!("{}", version));
assert_eq!(&*version.to_string(), "1.2.3");
}
#[test]
fn test_minor_string() {
let version = Version::Minor(1, 2);
assert_eq!(version.to_string(), format!("{}", version));
assert_eq!(&*version.to_string(), "1.2");
}
}