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use strum::{AsRefStr, Display, EnumString, IntoStaticStr};
/// Operator at the start of a [`DependencySpecification`](super::DependencySpecification).
#[derive(Debug, Clone, Copy, PartialEq, Eq)] // core traits
#[derive(AsRefStr, Display, EnumString, IntoStaticStr)] // strum traits
pub enum DependencySpecificationOperator {
#[strum(serialize = "<")]
Less = -2,
#[strum(serialize = "<=")]
LessOrEqual = -1,
#[strum(serialize = "=")]
Equal = 0,
#[strum(serialize = ">=")]
GreaterOrEqual = 1,
#[strum(serialize = ">")]
Greater = 2,
}
impl DependencySpecificationOperator {
/// Parse a dependency spec operator from an input string.
///
/// ```
/// # use arch_pkg_text::value::DependencySpecificationOperator;
/// # use pretty_assertions::assert_eq;
/// assert_eq!(
/// DependencySpecificationOperator::parse("<1.27.0-1"),
/// Some((DependencySpecificationOperator::Less, "1.27.0-1")),
/// );
/// assert_eq!(
/// DependencySpecificationOperator::parse("<=1.27.0-1"),
/// Some((DependencySpecificationOperator::LessOrEqual, "1.27.0-1")),
/// );
/// assert_eq!(
/// DependencySpecificationOperator::parse("=1.27.0-1"),
/// Some((DependencySpecificationOperator::Equal, "1.27.0-1")),
/// );
/// assert_eq!(
/// DependencySpecificationOperator::parse(">=1.27.0-1"),
/// Some((DependencySpecificationOperator::GreaterOrEqual, "1.27.0-1")),
/// );
/// assert_eq!(
/// DependencySpecificationOperator::parse(">1.27.0-1"),
/// Some((DependencySpecificationOperator::Greater, "1.27.0-1")),
/// );
/// assert_eq!(DependencySpecificationOperator::parse("1.27.0-1"), None);
/// ```
pub fn parse(input: &str) -> Option<(Self, &'_ str)> {
use DependencySpecificationOperator::*;
[LessOrEqual, GreaterOrEqual, Less, Equal, Greater] // XOrEqual must place before X
.into_iter()
.find_map(|candidate| {
input
.strip_prefix(candidate.as_ref())
.map(|rest| (candidate, rest))
})
}
}