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(.module:
[lux #*
[control
[equivalence (#+ Equivalence)]
[hash (#+ Hash)]
pipe]
[data
[text
format]]])
(type: #export Register Nat)
(type: #export Variable
(#Local Register)
(#Foreign Register))
(type: #export Reference
(#Variable Variable)
(#Constant Name))
(structure: #export _ (Equivalence Variable)
(def: (= reference sample)
(case [reference sample]
(^template [<tag>]
[(<tag> reference') (<tag> sample')]
(n/= reference' sample'))
([#Local] [#Foreign])
_
#0)))
(structure: #export _ (Hash Variable)
(def: eq Equivalence<Variable>)
(def: (hash var)
(case var
(#Local register)
(n/* 1 register)
(#Foreign register)
(n/* 2 register))))
(do-template [<name> <family> <tag>]
[(template: #export (<name> content)
(<| <family>
<tag>
content))]
[local #..Variable #..Local]
[foreign #..Variable #..Foreign]
)
(do-template [<name> <tag>]
[(template: #export (<name> content)
(<| <tag>
content))]
[variable #..Variable]
[constant #..Constant]
)
(def: #export self Reference (..local 0))
(def: #export self?
(-> Variable Bit)
(|>> ..variable
(case> (^ (..local 0))
#1
_
#0)))
(def: #export (%variable variable)
(Format Variable)
(case variable
(#Local local)
(format "+" (%n local))
(#Foreign foreign)
(format "-" (%n foreign))))
(def: #export (%reference reference)
(Format Reference)
(case reference
(#Variable variable)
(%variable variable)
(#Constant constant)
(%name constant)))
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