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use std::iter::{Fuse, FusedIterator};
use std::mem::swap;
use crate::*;
use crate::iter::*;
/// # Time window union iterator
pub trait TimeUnion<TW>: TimeConvexIterator
{
type Output:TimeConvexIterator<TimePoint=Self::TimePoint>;
fn union(self, tw: TW) -> Self::Output;
}
impl<TW1,TW2> TimeUnion<TW2> for TW1
where
TW1: TimeConvexIterator,
TW2: TimeConvexIterator<TimePoint=TW1::TimePoint>
{
type Output = IterUnion<Self,TW2>;
#[inline]
fn union(self, tw: TW2) -> Self::Output {
IterUnion::new(self, tw)
}
}
impl<TW:TimeConvexIterator> TimeUnion<TimeInterval<TW::TimePoint>> for TW
{
type Output = IterUnion<Self,<TimeInterval<TW::TimePoint> as IntoIterator>::IntoIter>;
#[inline]
fn union(self, tw: TimeInterval<TW::TimePoint>) -> Self::Output {
IterUnion::new(self, tw.into_iter())
}
}
impl<TW:TimeConvexIterator> TimeUnion<&TimeInterval<TW::TimePoint>> for TW
{
type Output = IterUnion<Self,<TimeInterval<TW::TimePoint> as IntoIterator>::IntoIter>;
#[inline]
fn union(self, tw: &TimeInterval<TW::TimePoint>) -> Self::Output {
IterUnion::new(self, tw.into_iter())
}
}
impl<TW:TimeConvexIterator> TimeUnion<TimeSet<TW::TimePoint>> for TW
{
type Output = IterUnion<Self,<TimeSet<TW::TimePoint> as IntoIterator>::IntoIter>;
#[inline]
fn union(self, tw: TimeSet<TW::TimePoint>) -> Self::Output {
IterUnion::new(self, tw.into_iter())
}
}
impl<TW:TimeConvexIterator> TimeUnion<&TimeSet<TW::TimePoint>> for TW
{
type Output = IterUnion<Self,<TimeSet<TW::TimePoint> as IntoIterator>::IntoIter>;
#[inline]
fn union(self, tw: &TimeSet<TW::TimePoint>) -> Self::Output {
// todo: suppress the clone function
IterUnion::new(self, tw.clone().into_iter())
}
}
#[derive(Copy,Clone,Debug)]
enum UnionState {
Init, // computation didn’t start yet
WaitI, // I should be next, J is temporary
WaitJ, // J should be next, I is temporary
OnlyI, // I should be next, J is empty (only I remains)
OnlyJ, // J should be next, I is empty (only J remains)
End // nothing more to do
}
pub struct IterUnion<I,J>
where
I:TimeConvexIterator,
J:TimeConvexIterator<TimePoint=I::TimePoint>
{
i: Fuse<I>, j: Fuse<J>, state: UnionState, tmp: TimeInterval<I::TimePoint>
}
impl<I,J> IterUnion<I,J>
where
I:TimeConvexIterator,
J:TimeConvexIterator<TimePoint=I::TimePoint>
{
fn new(i:I, j:J) -> Self {
Self { i: i.fuse(), j: j.fuse(), state: UnionState::Init, tmp:TimeInterval::all() }
}
}
impl<I,J> Iterator for IterUnion<I,J>
where
I:TimeConvexIterator,
J:TimeConvexIterator<TimePoint=I::TimePoint>
{
type Item = TimeInterval<I::TimePoint>;
fn next(&mut self) -> Option<Self::Item>
{
loop {
match self.state {
UnionState::Init => {
match (self.i.next(), self.j.next()) {
(None,None) => { self.state = UnionState::End; break None }
(Some(i), None) => { self.state = UnionState::OnlyI; break Some(i) },
(None, Some(j)) => { self.state = UnionState::OnlyJ; break Some(j) },
(Some(i), Some(j)) if i.upper < j.lower.just_before() => {
// i: [------------------]
// j: [--------]
//=>tmp: [--------]
self.state = UnionState::WaitI;
self.tmp=j;
break Some(i)
},
(Some(i), Some(j)) if j.upper < i.lower.just_before() => {
// i: [------------------]
// j: [--------]
//=>tmp: [------------------]
self.state = UnionState::WaitJ;
self.tmp=i;
break Some(j)
},
(Some(i), Some(j)) if i.upper <= j.upper => {
// i: [------------------] or [-----------]
// j: [--------] or [----------------------]
//=>tmp: [---------------------] or [----------------------]
self.state = UnionState::WaitI;
self.tmp = TimeInterval { lower: i.lower.min(j.lower), upper: j.upper };
},
(Some(i), Some(j)) => {
// i: [------------------] or [----------------]
// j: [--------] or [------------------]
//=>tmp [------------------] or [----------------------]
self.state = UnionState::WaitJ;
self.tmp = TimeInterval { lower: i.lower.min(j.lower), upper: i.upper };
},
}
}
UnionState::WaitI => {
match self.i.next() {
None => {
/* end of the iterator over i...*/
self.state = UnionState::OnlyJ;
break Some(self.tmp)
},
Some(i) if i.upper < self.tmp.lower.just_before() => {
// i: [------------------]
// tmp: [--------]
//=>tmp: [--------]
break Some(i)
},
Some(mut i) if self.tmp.upper < i.lower.just_before() => {
// i: [------------------]
// tmp: [--------]
//=>tmp: [------------------]
self.state = UnionState::WaitJ;
swap(&mut self.tmp, &mut i);
break Some(i)
},
Some(i) if i.upper <= self.tmp.upper => {
// i: [------------------] or [-----------]
// tmp: [--------] or [----------------------]
//=>tmp: [---------------------] or [----------------------]
if self.tmp.lower > i.lower { self.tmp.lower = i.lower; }
},
Some(i) => {
// i: [------------------] or [----------------]
// tmp: [--------] or [------------------]
//=>tmp [------------------] or [----------------------]
self.state = UnionState::WaitJ;
if self.tmp.lower > i.lower { self.tmp.lower = i.lower; }
self.tmp.upper = i.upper;
},
}
}
UnionState::WaitJ => {
match self.j.next() {
None => {
/* end of the iterator over j...*/
self.state = UnionState::OnlyI;
break Some(self.tmp)
},
Some(j) if j.upper < self.tmp.lower.just_before() => {
// tmp: [--------]
// j: [------------------]
//=>tmp: [--------]
break Some(j)
},
Some(mut j) if self.tmp.upper < j.lower.just_before() => {
// tmp: [--------]
// j: [------------------]
//=>tmp: [------------------]
self.state = UnionState::WaitI;
swap(&mut self.tmp, &mut j);
break Some(j)
},
Some(j) if j.upper <= self.tmp.upper => {
// tmp: [--------] or [----------------------]
// j: [------------------] or [-----------]
//=>tmp: [---------------------] or [----------------------]
if self.tmp.lower > j.lower { self.tmp.lower = j.lower; }
}
Some(j) => {
// tmp: [--------] or [------------------]
// j: [------------------] or [----------------]
//=>tmp [------------------] or [----------------------]
self.state = UnionState::WaitI;
if self.tmp.lower > j.lower { self.tmp.lower = j.lower; }
self.tmp.upper = j.upper;
}
}
}
UnionState::OnlyI => { break self.i.next() }
UnionState::OnlyJ => { break self.j.next() }
UnionState::End => { break None }
}
}
}
fn size_hint(&self) -> (usize, Option<usize>)
{
match self.state {
UnionState::OnlyI => { self.i.size_hint() }
UnionState::OnlyJ => { self.j.size_hint() }
UnionState::End => { (0, Some(0)) }
_ => {
if let (_,Some(imax)) = self.i.size_hint() {
if let (_,Some(jmax)) = self.j.size_hint() {
return (0, Some(imax.saturating_add(jmax)));
}
}
(0, None)
}
}
}
}
impl<I,J> TimeConvexIterator for IterUnion<I,J>
where
I:TimeConvexIterator,
J:TimeConvexIterator<TimePoint=I::TimePoint>
{
type TimePoint = I::TimePoint;
}
impl<I,J> FusedIterator for IterUnion<I,J>
where
I:TimeConvexIterator,
J:TimeConvexIterator<TimePoint=I::TimePoint> {}