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(.module:
lux
(lux (data (coll [list "list/" Functor<List>]))))
(def: #export Variable Int)
(def: #export Register Nat)
(def: #export (captured register)
(-> Register Variable)
(|> register n/inc nat-to-int (i/* -1)))
(def: #export (local register)
(-> Register Variable)
(nat-to-int register))
(def: #export (local-register variable)
(-> Variable Register)
(int-to-nat variable))
(def: #export (captured-register variable)
(-> Variable Register)
(|> variable (i/* -1) int-to-nat n/dec))
(do-template [<name> <comp>]
[(def: #export (<name> var)
(-> Variable Bool)
(<comp> 0 var))]
[self? i/=]
[local? i/>]
[captured? i/<]
)
(def: #export (from-ref ref)
(-> Ref Variable)
(case ref
(#.Local register)
(local register)
(#.Captured register)
(captured register)))
(def: #export (environment scope)
(-> Scope (List Variable))
(|> scope
(get@ [#.captured #.mappings])
(list/map (function (_ [_ [_ ref]]) (from-ref ref)))))
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