use std::fmt;
#[derive(PartialEq, Eq, Copy, Clone, PartialOrd, Ord)]
pub struct Version(u64);
impl Version {
pub fn read() -> Option<Version> {
::get_version_and_date()
.and_then(|(version, _)| version)
.and_then(|version| Version::parse(&version))
}
pub fn parse(version: &str) -> Option<Version> {
let splits = version.split('-')
.nth(0)
.unwrap_or("")
.split('.')
.map(|s| s.parse::<u16>().ok());
let mut mmp = [0u16; 3];
for (i, split) in splits.enumerate() {
mmp[i] = match (i, split) {
(3, _) | (_, None) => return None,
(_, Some(v)) => v,
};
}
let (maj, min, patch) = (mmp[0], mmp[1], mmp[2]);
Some(Version::from_mmp(maj, min, patch))
}
pub fn from_mmp(major: u16, minor: u16, patch: u16) -> Version {
Version(((major as u64) << 32) | ((minor as u64) << 16) | patch as u64)
}
pub fn to_mmp(&self) -> (u16, u16, u16) {
let major = self.0 >> 32;
let minor = (self.0 << 32) >> 48;
let patch = (self.0 << 48) >> 48;
(major as u16, minor as u16, patch as u16)
}
pub fn at_least(&self, version: &str) -> bool {
Version::parse(version)
.map(|version| self >= &version)
.unwrap_or(false)
}
pub fn at_most(&self, version: &str) -> bool {
Version::parse(version)
.map(|version| self <= &version)
.unwrap_or(false)
}
pub fn exactly(&self, version: &str) -> bool {
Version::parse(version)
.map(|version| self == &version)
.unwrap_or(false)
}
}
impl fmt::Display for Version {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let (major, minor, patch) = self.to_mmp();
write!(f, "{}.{}.{}", major, minor, patch)
}
}
impl fmt::Debug for Version {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Version({:?}, {:?})", self.0, self.to_mmp())
}
}
#[cfg(test)]
mod tests {
use super::Version;
macro_rules! assert_to_mmp {
($s:expr, None) => (
assert_eq!(Version::parse($s), None);
);
($s:expr, $mmp:expr) => (
assert_eq!(Version::parse($s).map(|v| v.to_mmp()), Some($mmp));
)
}
macro_rules! assert_from_mmp {
(($x:expr, $y:expr, $z:expr) => $s:expr) => {
assert_eq!(Some(Version::from_mmp($x, $y, $z)), Version::parse($s));
};
}
#[test]
fn test_str_to_mmp() {
assert_to_mmp!("1", (1, 0, 0));
assert_to_mmp!("1.2", (1, 2, 0));
assert_to_mmp!("1.18.0", (1, 18, 0));
assert_to_mmp!("3.19.0", (3, 19, 0));
assert_to_mmp!("1.19.0-nightly", (1, 19, 0));
assert_to_mmp!("1.12.2349", (1, 12, 2349));
assert_to_mmp!("0.12", (0, 12, 0));
assert_to_mmp!("1.12.5", (1, 12, 5));
assert_to_mmp!("1.12", (1, 12, 0));
assert_to_mmp!("1", (1, 0, 0));
assert_to_mmp!("1.4.4-nightly (d84693b93 2017-07-09))", (1, 4, 4));
assert_to_mmp!("1.58879.4478-dev", (1, 58879, 4478));
assert_to_mmp!("1.58879.4478-dev (d84693b93 2017-07-09))", (1, 58879, 4478));
}
#[test]
fn test_malformed() {
assert_to_mmp!("1.65536.2", None);
assert_to_mmp!("-1.2.3", None);
assert_to_mmp!("1. 2", None);
assert_to_mmp!("", None);
assert_to_mmp!(" ", None);
assert_to_mmp!(".", None);
assert_to_mmp!("one", None);
assert_to_mmp!("1.", None);
assert_to_mmp!("1.2.3.4.5.6", None);
}
#[test]
fn test_from_mmp() {
assert_from_mmp!((1, 18, 0) => "1.18.0");
assert_from_mmp!((3, 19, 0) => "3.19.0");
assert_from_mmp!((1, 19, 0) => "1.19.0");
assert_from_mmp!((1, 12, 2349) => "1.12.2349");
assert_from_mmp!((0, 12, 0) => "0.12");
assert_from_mmp!((1, 12, 5) => "1.12.5");
assert_from_mmp!((1, 12, 0) => "1.12");
assert_from_mmp!((1, 0, 0) => "1");
assert_from_mmp!((1, 4, 4) => "1.4.4");
assert_from_mmp!((1, 58879, 4478) => "1.58879.4478");
}
#[test]
fn test_comparisons() {
let version = Version::parse("1.18.0").unwrap();
assert!(version.exactly("1.18.0"));
assert!(version.at_least("1.12.0"));
assert!(version.at_least("1.12"));
assert!(version.at_least("1"));
assert!(version.at_most("1.18.1"));
assert!(!version.exactly("1.19.0"));
assert!(!version.exactly("1.18.1"));
let version = Version::parse("1.20.0-nightly").unwrap();
assert!(version.exactly("1.20.0-beta"));
assert!(version.exactly("1.20.0-nightly"));
assert!(version.exactly("1.20.0"));
assert!(!version.exactly("1.19"));
let version = Version::parse("1.3").unwrap();
assert!(version.exactly("1.3.0"));
assert!(version.exactly("1.3.0-stable"));
assert!(version.exactly("1.3"));
assert!(!version.exactly("1.5.0-stable"));
let version = Version::parse("1").unwrap();
assert!(version.exactly("1.0.0"));
assert!(version.exactly("1.0"));
assert!(version.exactly("1"));
assert!(Version::parse("one.two.three").is_none());
}
macro_rules! reflexive_display {
($s:expr) => (
assert_eq!(Version::parse($s).unwrap().to_string(), $s);
)
}
#[test]
fn display() {
reflexive_display!("1.0.0");
reflexive_display!("1.2.3");
reflexive_display!("1.12.1438");
reflexive_display!("1.44.0");
reflexive_display!("2.44.0");
reflexive_display!("23459.28923.3483");
}
}