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use crate::interval::*;
#[derive(Clone, Copy, Debug, PartialEq)]
pub enum OverlappingState {
Undefined,
BothEmpty,
FirstEmpty,
SecondEmpty,
Before,
Meets,
Overlaps,
Starts,
ContainedBy,
Finishes,
Equal,
FinishedBy,
Contains,
StartedBy,
OverlappedBy,
MetBy,
After,
}
impl Interval {
pub fn overlap(self, rhs: Self) -> OverlappingState {
use OverlappingState::*;
if self.is_empty() {
if rhs.is_empty() {
return BothEmpty;
} else {
return FirstEmpty;
}
}
if rhs.is_empty() {
return SecondEmpty;
}
let a = self.inf_raw();
let b = self.sup_raw();
let c = rhs.inf_raw();
let d = rhs.sup_raw();
#[allow(clippy::collapsible_if)]
if b < d {
if a < c {
if b < c {
Before
} else if b == c {
Meets
} else {
Overlaps
}
} else {
if a == c {
Starts
} else {
ContainedBy
}
}
} else if b == d {
if a > c {
Finishes
} else if a == c {
Equal
} else {
FinishedBy
}
} else {
if a <= c {
if a < c {
Contains
} else {
StartedBy
}
} else {
if a < d {
OverlappedBy
} else if a == d {
MetBy
} else {
After
}
}
}
}
}
impl DecoratedInterval {
pub fn overlap(self, rhs: Self) -> OverlappingState {
if self.is_nai() || rhs.is_nai() {
return OverlappingState::Undefined;
}
self.x.overlap(rhs.x)
}
}
#[cfg(test)]
mod tests {
use super::*;
type DI = DecoratedInterval;
#[test]
fn nai() {
assert_eq!(DI::NAI.overlap(DI::PI), OverlappingState::Undefined);
assert_eq!(DI::PI.overlap(DI::NAI), OverlappingState::Undefined);
}
}