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(.module:
[lux #*
[control
[equivalence (#+ Equivalence)]
pipe
["." monad (#+ do)]]
[data
["." product]
[bit ("bit/." Equivalence<Bit>)]
[text ("text/." Equivalence<Text>)
format]
[number ("frac/." Equivalence<Frac>)]
[collection
["." list ("list/." Fold<List> Monoid<List>)]]]]
["." // (#+ Path Synthesis Operation Phase)
["." function]
["/." // ("operation/." Monad<Operation>)
["." analysis (#+ Pattern Match Analysis)]
[//
["." reference]]]])
(def: (path' pattern bodyC)
(-> Pattern (Operation Path) (Operation Path))
(case pattern
(#analysis.Simple simple)
(case simple
#analysis.Unit
bodyC
(^template [<from> <to>]
(<from> value)
(operation/map (|>> (#//.Seq (#//.Test (|> value <to>))))
bodyC))
([#analysis.Bit #//.Bit]
[#analysis.Nat (<| #//.I64 .i64)]
[#analysis.Int (<| #//.I64 .i64)]
[#analysis.Rev (<| #//.I64 .i64)]
[#analysis.Frac #//.F64]
[#analysis.Text #//.Text]))
(#analysis.Bind register)
(<| (do ///.Monad<Operation>
[arity //.scope-arity])
(:: @ map (|>> (#//.Seq (#//.Bind (if (function.nested? arity)
(n/+ (dec arity) register)
register)))))
//.with-new-local
bodyC)
(#analysis.Complex _)
(case (analysis.variant-pattern pattern)
(#.Some [lefts right? value-pattern])
(operation/map (|>> (#//.Seq (#//.Access (#//.Side (if right?
(#.Right lefts)
(#.Left lefts))))))
(path' value-pattern bodyC))
#.None
(let [tuple (analysis.tuple-pattern pattern)
tuple/last (dec (list.size tuple))]
(list/fold (function (_ [tuple/idx tuple/member] thenC)
(case tuple/member
(#analysis.Simple #analysis.Unit)
thenC
_
(let [last? (n/= tuple/last tuple/idx)]
(|> (if (or last?
(is? bodyC thenC))
thenC
(operation/map (|>> (#//.Seq #//.Pop)) thenC))
(path' tuple/member)
(operation/map (|>> (#//.Seq (#//.Access (#//.Member (if last?
(#.Right (dec tuple/idx))
(#.Left tuple/idx)))))))))))
bodyC
(list.reverse (list.enumerate tuple)))))))
(def: #export (path synthesize pattern bodyA)
(-> Phase Pattern Analysis (Operation Path))
(path' pattern (operation/map (|>> #//.Then) (synthesize bodyA))))
(def: #export (weave leftP rightP)
(-> Path Path Path)
(with-expansions [<default> (as-is (#//.Alt leftP rightP))]
(case [leftP rightP]
[(#//.Seq preL postL)
(#//.Seq preR postR)]
(case (weave preL preR)
(#//.Alt _)
<default>
weavedP
(#//.Seq weavedP (weave postL postR)))
[#//.Pop #//.Pop]
rightP
(^template [<tag> <eq>]
[(#//.Test (<tag> leftV))
(#//.Test (<tag> rightV))]
(if (<eq> leftV rightV)
rightP
<default>))
([#//.Bit bit/=]
[#//.I64 "lux i64 ="]
[#//.F64 frac/=]
[#//.Text text/=])
(^template [<access> <side>]
[(#//.Access (<access> (<side> leftL)))
(#//.Access (<access> (<side> rightL)))]
(if (n/= leftL rightL)
rightP
<default>))
([#//.Side #.Left]
[#//.Side #.Right]
[#//.Member #.Left]
[#//.Member #.Right])
[(#//.Bind leftR) (#//.Bind rightR)]
(if (n/= leftR rightR)
rightP
<default>)
_
<default>)))
(def: #export (synthesize synthesize^ inputA [headB tailB+])
(-> Phase Analysis Match (Operation Synthesis))
(do ///.Monad<Operation>
[inputS (synthesize^ inputA)]
(with-expansions [<unnecesary-let>
(as-is (^multi (^ (#analysis.Reference (reference.local outputR)))
(n/= inputR outputR))
(wrap inputS))
<let>
(as-is [[(#analysis.Bind inputR) headB/bodyA]
#.Nil]
(case headB/bodyA
<unnecesary-let>
_
(do @
[arity //.scope-arity
headB/bodyS (//.with-new-local
(synthesize^ headB/bodyA))]
(wrap (//.branch/let [inputS
(if (function.nested? arity)
(n/+ (dec arity) inputR)
inputR)
headB/bodyS])))))
<if>
(as-is (^or (^ [[(analysis.pattern/bit #1) thenA]
(list [(analysis.pattern/bit #0) elseA])])
(^ [[(analysis.pattern/bit #0) elseA]
(list [(analysis.pattern/bit #1) thenA])]))
(do @
[thenS (synthesize^ thenA)
elseS (synthesize^ elseA)]
(wrap (//.branch/if [inputS thenS elseS]))))
<case>
(as-is _
(let [[[lastP lastA] prevsPA] (|> (#.Cons headB tailB+)
list.reverse
(case> (#.Cons [lastP lastA] prevsPA)
[[lastP lastA] prevsPA]
_
(undefined)))]
(do @
[lastSP (path synthesize^ lastP lastA)
prevsSP+ (monad.map @ (product.uncurry (path synthesize^)) prevsPA)]
(wrap (//.branch/case [inputS (list/fold weave lastSP prevsSP+)])))))]
(case [headB tailB+]
<let>
<if>
<case>))))
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