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(;module:
lux
(lux (data [number "Deg/" Interval<Deg>])))
(def: #export TRUE Deg Deg/top)
(def: #export FALSE Deg Deg/bottom)
(do-template [<name> <chooser>]
[(def: #export <name>
(-> Deg Deg Deg)
<chooser>)]
[and~ d.min]
[or~ d.max]
)
(def: #export (not~ input)
(-> Deg Deg)
(d.- input TRUE))
(def: #export (implies~ consequent antecedent)
(-> Deg Deg Deg)
(or~ (not~ antecedent)
consequent))
(def: #export (includes~ sub super)
(-> Deg Deg Deg)
(let [-sub (not~ sub)
sum (d.+ -sub super)
no-overflow? (and (d.>= -sub sum)
(d.>= super sum))]
(if no-overflow?
sum
TRUE)))
(def: #export (=~ left right)
(-> Deg Deg Deg)
(and~ (or~ (not~ left) right)
(or~ left (not~ right))))
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