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(;module:
lux
(lux (data [bool "bool/" Eq<Bool>]
[text "text/" Eq<Text>]
text/format
[number]
(coll [list "list/" Fold<List>]))
(meta [code "code/" Eq<Code>]))
(luxc (lang ["la" analysis]
["ls" synthesis])))
(def: #export (path outer-arity pattern)
(-> ls;Arity la;Pattern ls;Path)
(case pattern
(^code ("lux case tuple" [(~@ membersP)]))
(case (list;reverse membersP)
#;Nil
(' ("lux case pop"))
(#;Cons singletonP #;Nil)
(path outer-arity singletonP)
(#;Cons lastP prevsP)
(let [length (list;size membersP)
last-idx (n.dec length)
[_ tuple-path] (list/fold (function [current-pattern [current-idx next-path]]
[(n.dec current-idx)
(` ("lux case seq"
("lux case tuple left" (~ (code;nat current-idx)) (~ (path outer-arity current-pattern)))
(~ next-path)))])
[(n.dec last-idx)
(` ("lux case tuple right" (~ (code;nat last-idx)) (~ (path outer-arity lastP))))]
prevsP)]
(` ("lux case seq"
(~ tuple-path)
("lux case pop")))))
(^code ("lux case variant" (~ [_ (#;Nat tag)]) (~ [_ (#;Nat num-tags)]) (~ memberP)))
(` ("lux case seq"
(~ (if (n.= (n.dec num-tags) tag)
(` ("lux case variant right" (~ (code;nat tag)) (~ (path outer-arity memberP))))
(` ("lux case variant left" (~ (code;nat tag)) (~ (path outer-arity memberP))))))
("lux case pop")))
(^code ("lux case bind" (~ [_ (#;Nat register)])))
(` ("lux case seq"
("lux case bind" (~ (if (n.> +1 outer-arity)
(code;nat (n.+ (n.dec outer-arity) register))
(code;nat register))))
("lux case pop")))
_
(` ("lux case seq"
(~ pattern)
("lux case pop")))))
(def: #export (weave leftP rightP)
(-> ls;Path ls;Path ls;Path)
(with-expansions [<default> (as-is (` ("lux case alt" (~ leftP) (~ rightP))))]
(case [leftP rightP]
(^template [<special>]
(^ [[_ (#;Form (list [_ (#;Text <special>)] [_ (#;Nat left-idx)] left-then))]
[_ (#;Form (list [_ (#;Text <special>)] [_ (#;Nat right-idx)] right-then))]])
(if (n.= left-idx right-idx)
(` (<special> (~ (code;nat left-idx)) (~ (weave left-then right-then))))
<default>))
(["lux case tuple left"]
["lux case tuple right"]
["lux case variant left"]
["lux case variant right"])
(^ [[_ (#;Form (list [_ (#;Text "lux case seq")] left-pre left-post))]
[_ (#;Form (list [_ (#;Text "lux case seq")] right-pre right-post))]])
(case (weave left-pre right-pre)
(^ [_ (#;Form (list [_ (#;Text "lux case alt")] _ _))])
<default>
weavedP
(` ("lux case seq" (~ weavedP) (~ (weave left-post right-post)))))
_
(if (code/= leftP rightP)
leftP
<default>))))
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