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(.module:
[library
[lux #*
[abstract
[equivalence (#+ Equivalence)]
[hash (#+ Hash)]]
[control
[pipe (#+ case>)]]
[data
[text
["%" format (#+ Format)]]]
[math
[number
["n" nat]
["i" int]]]]])
(type: #export Register
Nat)
(type: #export Variable
(#Local Register)
(#Foreign Register))
(implementation: #export equivalence
(Equivalence Variable)
(def: (= reference sample)
(case [reference sample]
(^template [<tag>]
[[(<tag> reference') (<tag> sample')]
(n.= reference' sample')])
([#Local] [#Foreign])
_
#0)))
(implementation: #export hash
(Hash Variable)
(def: &equivalence
..equivalence)
(def: hash
(|>> (case> (^template [<factor> <tag>]
[(<tag> register)
($_ n.* <factor>
(\ n.hash hash register))])
([2 #Local]
[3 #Foreign])))))
(template: #export (self)
(#..Local 0))
(def: #export self?
(-> Variable Bit)
(|>> (case> (^ (..self))
true
_
false)))
(def: #export format
(Format Variable)
(|>> (case> (#Local local)
(%.format "+" (%.nat local))
(#Foreign foreign)
(%.format "-" (%.nat foreign)))))
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