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use std::fmt;
/// Version number: `major.minor.patch`, ignoring release channel.
#[derive(PartialEq, Eq, Copy, Clone, PartialOrd, Ord)]
pub struct Version(u64);
impl Version {
/// Reads the version of the running compiler. If it cannot be determined
/// (see the [top-level documentation](crate)), returns `None`.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// match Version::read() {
/// Some(d) => format!("Version is: {}", d),
/// None => format!("Failed to read the version.")
/// };
/// ```
pub fn read() -> Option<Version> {
::get_version_and_date()
.and_then(|(version, _)| version)
.and_then(|version| Version::parse(&version))
}
/// Parse a Rust release version (of the form
/// `major[.minor[.patch[-channel]]]`), ignoring the release channel, if
/// any. Returns `None` if `version` is not a valid Rust version string.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// let version = Version::parse("1.18.0").unwrap();
/// assert!(version.exactly("1.18.0"));
///
/// let version = Version::parse("1.20.0-nightly").unwrap();
/// assert!(version.exactly("1.20.0"));
/// assert!(version.exactly("1.20.0-beta"));
///
/// let version = Version::parse("1.3").unwrap();
/// assert!(version.exactly("1.3.0"));
///
/// let version = Version::parse("1").unwrap();
/// assert!(version.exactly("1.0.0"));
///
/// assert!(Version::parse("one.two.three").is_none());
/// assert!(Version::parse("1.65536.2").is_none());
/// assert!(Version::parse("1. 2").is_none());
/// assert!(Version::parse("").is_none());
/// assert!(Version::parse("1.").is_none());
/// assert!(Version::parse("1.2.3.4").is_none());
/// ```
pub fn parse(version: &str) -> Option<Version> {
let splits = version.split('-')
.nth(0)
.unwrap_or("")
.split('.')
.map(|s| s.parse::<u16>());
let mut mmp = [0u16; 3];
for (i, split) in splits.enumerate() {
mmp[i] = match (i, split) {
(3, _) | (_, Err(_)) => return None,
(_, Ok(v)) => v,
};
}
let (maj, min, patch) = (mmp[0], mmp[1], mmp[2]);
Some(Version::from_mmp(maj, min, patch))
}
/// Creates a `Version` from `(major, minor, patch)` version components.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// assert!(Version::from_mmp(1, 35, 0).exactly("1.35.0"));
/// assert!(Version::from_mmp(1, 33, 0).exactly("1.33.0"));
/// assert!(Version::from_mmp(1, 35, 1).exactly("1.35.1"));
/// assert!(Version::from_mmp(1, 13, 2).exactly("1.13.2"));
/// ```
pub fn from_mmp(major: u16, minor: u16, patch: u16) -> Version {
Version(((major as u64) << 32) | ((minor as u64) << 16) | patch as u64)
}
/// Returns the `(major, minor, patch)` version components of `self`.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// assert_eq!(Version::parse("1.35.0").unwrap().to_mmp(), (1, 35, 0));
/// assert_eq!(Version::parse("1.33.0").unwrap().to_mmp(), (1, 33, 0));
/// assert_eq!(Version::parse("1.35.1").unwrap().to_mmp(), (1, 35, 1));
/// assert_eq!(Version::parse("1.13.2").unwrap().to_mmp(), (1, 13, 2));
/// ```
pub fn to_mmp(&self) -> (u16, u16, u16) {
let major = self.0 >> 32;
let minor = self.0 >> 16;
let patch = self.0;
(major as u16, minor as u16, patch as u16)
}
/// Returns `true` if `self` is greater than or equal to `version`.
///
/// If `version` is greater than `self`, or if `version` is not a valid Rust
/// version string, returns `false`.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// let version = Version::parse("1.35.0").unwrap();
///
/// assert!(version.at_least("1.33.0"));
/// assert!(version.at_least("1.35.0"));
/// assert!(version.at_least("1.13.2"));
///
/// assert!(!version.at_least("1.35.1"));
/// assert!(!version.at_least("1.55.0"));
///
/// let version = Version::parse("1.12.5").unwrap();
///
/// assert!(version.at_least("1.12.0"));
/// assert!(!version.at_least("1.35.0"));
/// ```
pub fn at_least(&self, version: &str) -> bool {
Version::parse(version)
.map(|version| self >= &version)
.unwrap_or(false)
}
/// Returns `true` if `self` is less than or equal to `version`.
///
/// If `version` is less than `self`, or if `version` is not a valid Rust
/// version string, returns `false`.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// let version = Version::parse("1.35.0").unwrap();
///
/// assert!(version.at_most("1.35.1"));
/// assert!(version.at_most("1.55.0"));
/// assert!(version.at_most("1.35.0"));
///
/// assert!(!version.at_most("1.33.0"));
/// assert!(!version.at_most("1.13.2"));
/// ```
pub fn at_most(&self, version: &str) -> bool {
Version::parse(version)
.map(|version| self <= &version)
.unwrap_or(false)
}
/// Returns `true` if `self` is exactly equal to `version`.
///
/// If `version` is not equal to `self`, or if `version` is not a valid Rust
/// version string, returns `false`.
///
/// # Example
///
/// ```rust
/// use version_check::Version;
///
/// let version = Version::parse("1.35.0").unwrap();
///
/// assert!(version.exactly("1.35.0"));
///
/// assert!(!version.exactly("1.33.0"));
/// assert!(!version.exactly("1.35.1"));
/// assert!(!version.exactly("1.13.2"));
/// ```
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 {
// We don't use `debug_*` because it's not available in `1.0.0`.
write!(f, "Version({:?}, {:?})", self.0, self.to_mmp())
}
}
#[cfg(test)]
mod tests {
use super::Version;
macro_rules! assert_to_mmp {
// We don't use `.into::<Option<_>>` because it's not available in 1.0.
// We don't use the message part of `assert!` for the same reason.
($s:expr, None) => (
assert_eq!(Version::parse($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");
}
}