composer-semver 0.2.0

A faithful Rust port of composer/semver: Composer-flavored Version, Constraint, and Stability — normalize, compare, and match version constraints.
Documentation 
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//! Composer stability flags.
//!
//! Order from least to most stable: `dev < alpha < beta < RC < stable`.
//! Lower = less stable; `Ord` is wired so `Stable > Dev`.

#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub enum Stability {
    Dev,
    Alpha,
    Beta,
    Rc,
    Stable,
}

impl Stability {
    /// Parse a Composer stability keyword. Returns `None` for unknown strings.
    /// Matches the keywords accepted by `composer.json`'s `minimum-stability`.
    pub fn parse(s: &str) -> Option<Self> {
        match s.to_ascii_lowercase().as_str() {
            "dev" => Some(Self::Dev),
            "alpha" => Some(Self::Alpha),
            "beta" => Some(Self::Beta),
            "rc" => Some(Self::Rc),
            "stable" => Some(Self::Stable),
            _ => None,
        }
    }

    pub fn as_str(self) -> &'static str {
        match self {
            Self::Dev => "dev",
            Self::Alpha => "alpha",
            Self::Beta => "beta",
            Self::Rc => "RC",
            Self::Stable => "stable",
        }
    }
}