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(.module:
lux
(lux [function]
(data (coll [list "list/" Fold<List>]))))
(type: #export #rec Primitive
#Unit
(#Bool Bool)
(#Nat Nat)
(#Int Int)
(#Deg Deg)
(#Frac Frac)
(#Text Text))
(type: #export Tag Nat)
(type: #export (Composite a)
(#Sum (Either a a))
(#Product [a a]))
(type: #export Register Nat)
(type: #export #rec Pattern
(#Simple Primitive)
(#Complex (Composite Pattern))
(#Bind Register))
(type: #export Variable
(#Local Register)
(#Foreign Register))
(type: #export (Match p e)
[[p e] (List [p e])])
(type: #export Environment
(List Variable))
(type: #export (Special e)
[Text (List e)])
(type: #export #rec Analysis
(#Primitive Primitive)
(#Structure (Composite Analysis))
(#Case Analysis (Match Pattern Analysis))
(#Function Environment Analysis)
(#Apply Analysis Analysis)
(#Variable Variable)
(#Constant Ident)
(#Special (Special Text)))
(type: #export Variant
{#lefts Nat
#right? Bool
#value Analysis})
(type: #export Tuple (List Analysis))
(type: #export Application [Analysis (List Analysis)])
(do-template [<name> <tag>]
[(def: <name>
(-> Analysis Analysis)
(|>> <tag> #Sum #Structure))]
[left #.Left]
[right #.Right]
)
(def: (last? size tag)
(-> Nat Tag Bool)
(n/= (dec size) tag))
(def: #export (no-op value)
(-> Analysis Analysis)
(let [identity (#Function (list) (#Variable (#Local +1)))]
(#Apply value identity)))
(def: #export (sum size tag value)
(-> Nat Tag Analysis Analysis)
(if (last? size tag)
(if (n/= +1 tag)
(..right value)
(list/fold (function.const ..left)
(..right value)
(list.n/range +0 (n/- +2 tag))))
(list/fold (function.const ..left)
(case value
(#Structure (#Sum _))
(no-op value)
_
value)
(list.n/range +0 tag))))
(def: #export (product members)
(-> Tuple Analysis)
(case (list.reverse members)
#.Nil
(#Primitive #Unit)
(#.Cons singleton #.Nil)
singleton
(#.Cons last prevs)
(list/fold (function (_ left right) (#Structure (#Product left right)))
last prevs)))
(def: #export (apply [func args])
(-> Application Analysis)
(list/fold (function (_ arg func) (#Apply arg func)) func args))
(type: #export Analyser
(-> Code (Meta Analysis)))
(def: #export (tuple analysis)
(-> Analysis Tuple)
(case analysis
(#Structure (#Product left right))
(#.Cons left (tuple right))
_
(list analysis)))
(def: #export (variant analysis)
(-> Analysis (Maybe Variant))
(loop [lefts +0
variantA analysis]
(case variantA
(#Structure (#Sum (#.Left valueA)))
(case valueA
(#Structure (#Sum _))
(recur (inc lefts) valueA)
_
(#.Some {#lefts lefts
#right? false
#value valueA}))
(#Structure (#Sum (#.Right valueA)))
(#.Some {#lefts lefts
#right? true
#value valueA})
_
#.None)))
(def: #export (application analysis)
(-> Analysis Application)
(case analysis
(#Apply head func)
(let [[func' tail] (application func)]
[func' (#.Cons head tail)])
_
[analysis (list)]))
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