perspective-migrate 5.7.0

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// ┃ Copyright (c) 2017, the Perspective Authors.                              ┃
// ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
// ┃ This file is part of the Perspective library, distributed under the terms ┃
// ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
// ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

use std::fmt;

/// A Perspective release, ordered by `major.minor.patch` with any
/// pre-release or build suffix ignored.
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct Version {
    pub major: u64,
    pub minor: u64,
    pub patch: u64,
}

impl Version {
    pub const fn new(major: u64, minor: u64, patch: u64) -> Self {
        Self {
            major,
            minor,
            patch,
        }
    }

    /// Parse `x.y.z`, `x.y.z-pre` or `x.y.z+build`.
    pub fn parse(version: &str) -> Option<Self> {
        let core = version.trim().split(['-', '+']).next()?;
        let mut parts = core.split('.').map(|x| x.parse::<u64>().ok());
        let version = Self::new(parts.next()??, parts.next()??, parts.next()??);
        parts.next().is_none().then_some(version)
    }

    pub(crate) fn crate_version() -> Self {
        Self::parse(env!("CARGO_PKG_VERSION")).expect("CARGO_PKG_VERSION")
    }
}

impl fmt::Display for Version {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}.{}.{}", self.major, self.minor, self.patch)
    }
}