On Thu, Nov 17, 2016 at 04:10:32PM +0100, Alexander Burger wrote:
> (?
> @Sdate (cons Sdate T) # Range with open end
> @Edate (cons Edate NIL) # Reversed range with open start
> (select (@Proj)
> ((sDate +Proj @Sdate) (eDate +Proj @Edate)) # Search two indexes in
> parallel
> (range @Sdate @Proj sDate) # Check ranges
> (range @Edate @Proj eDate) ) ) # Check ranges
Sorry, that's probably wrong. You want both start and end to be in the
range, right? Then better:
(?
@Rng (cons Sdate Edate) # Range
(select (@Proj)
((sDate +Proj @Rng) (eDate +Proj @Rng)) # Search two indexes in
parallel
(range @Rng @Proj sDate) # Check ranges
(range @Rng @Proj eDate) ) ) # Check ranges
The corresponding 'collect' would be
(filter
'((This)
(and
(>= Edate (: sDate) Sdate)
(>= Edate (: eDate) Sdate) ) )
(collect 'sDate '+Proj Sdate (+ Edate 100)) )
Again, not tested!
♪♫ Alex
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