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//! # Types of range intervals.
/// Enumeration of range interval types.
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum IntervalType {
/// Open-end interval with defined value, like `(1..`, `..10)`, `]1..` or `..10[`.
Opened,
/// Open-end interval without value, like `(..`, `..)`, `]..` or `..[`.
OpenedUndef,
/// Closed-end interval with defined value, like `[1..` or `..10]`.
Closed,
/// Closed-end interval without value, like `[..` or `..]`.
ClosedUndef,
}
impl std::fmt::Display for IntervalType {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"{}",
match self {
IntervalType::Opened => "opened",
IntervalType::OpenedUndef => "opened,undefined",
IntervalType::Closed => "closed",
IntervalType::ClosedUndef => "closed,undefined",
}
)
}
}
impl IntervalType {
/// Return `true` when the interval is opened.
pub fn opened(&self) -> bool {
matches!(self, IntervalType::Opened | IntervalType::OpenedUndef)
}
/// Return `true` when the interval is closed.
pub fn closed(&self) -> bool {
matches!(self, IntervalType::Closed | IntervalType::ClosedUndef)
}
/// Return `true` when the interval has no value defined.
pub fn undefined(&self) -> bool {
matches!(self, IntervalType::OpenedUndef | IntervalType::ClosedUndef)
}
}