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(;module:
lux
(lux (data [bool "bool/" Eq<Bool>]
[text "text/" Eq<Text>]
text/format
[number]
(coll [list "list/" Fold<List> Monoid<List>]))
(meta [code "code/" Eq<Code>]))
(luxc (lang [";L" variable #+ Variable]
["la" analysis]
["ls" synthesis]
(synthesis [";S" function]))))
(def: popPS ls;Path (' ("lux case pop")))
(def: (path' outer-arity pattern)
(-> ls;Arity la;Pattern (List ls;Path))
(case pattern
(^code ("lux case tuple" [(~@ membersP)]))
(case membersP
#;Nil
(list popPS)
(#;Cons singletonP #;Nil)
(path' outer-arity singletonP)
(#;Cons _)
(let [last-idx (n.dec (list;size membersP))
[_ tuple-path] (list/fold (function [current-pattern [current-idx next]]
[(n.dec current-idx)
(|> (list (if (n.= last-idx current-idx)
(` ("lux case tuple right" (~ (code;nat current-idx))))
(` ("lux case tuple left" (~ (code;nat current-idx))))))
(list/compose (path' outer-arity current-pattern))
(list/compose next))])
[last-idx (list popPS)]
(list;reverse membersP))]
tuple-path))
(^code ("lux case variant" (~ [_ (#;Nat tag)]) (~ [_ (#;Nat num-tags)]) (~ memberP)))
(|> (list (if (n.= (n.dec num-tags) tag)
(` ("lux case variant right" (~ (code;nat tag))))
(` ("lux case variant left" (~ (code;nat tag))))))
(list/compose (path' outer-arity memberP))
(list& popPS))
(^code ("lux case bind" (~ [_ (#;Nat register)])))
(list popPS
(` ("lux case bind" (~ (code;nat (if (functionS;nested? outer-arity)
(|> register variableL;local (functionS;adjust-var outer-arity) variableL;local-register)
register))))))
_
(list popPS pattern)))
(def: (clean-unnecessary-pops paths)
(-> (List ls;Path) (List ls;Path))
(case paths
(#;Cons path paths')
(if (is popPS path)
(clean-unnecessary-pops paths')
paths)
#;Nil
paths))
(def: #export (path outer-arity pattern body)
(-> ls;Arity la;Pattern ls;Synthesis ls;Path)
(|> (path' outer-arity pattern) clean-unnecessary-pops
(list/fold (function [pre post]
(` ("lux case seq" (~ pre) (~ post))))
(` ("lux case exec" (~ body))))))
(def: #export (weave leftP rightP)
(-> ls;Path ls;Path ls;Path)
(with-expansions [<default> (as-is (` ("lux case alt" (~ leftP) (~ rightP))))]
(case [leftP rightP]
(^ [(^code ("lux case seq" (~ preL) (~ postL)))
(^code ("lux case seq" (~ preR) (~ postR)))])
(case (weave preL preR)
(^code ("lux case alt" (~ thenP) (~ elseP)))
<default>
weavedP
(` ("lux case seq" (~ weavedP) (~ (weave postL postR)))))
_
(if (code/= leftP rightP)
rightP
<default>))))
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