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(;module:
lux
(lux (control monad)
(data [text]
text/format
[maybe "maybe/" Monad<Maybe>]
[product]
["e" error]
(coll [list "list/" Fold<List> Monoid<List>]))
[meta])
(luxc ["&" base]))
(type: Locals (Bindings Text [Type Nat]))
(type: Captured (Bindings Text [Type Ref]))
(do-template [<slot> <is> <get> <then>]
[(def: (<is> name scope)
(-> Text Scope Bool)
(|> scope
(get@ [<slot> #;mappings])
(&;pl-contains? name)))
(def: (<get> name scope)
(-> Text Scope (Maybe [Type Ref]))
(|> scope
(get@ [<slot> #;mappings])
(&;pl-get name)
(maybe/map (function [[type value]]
[type (<then> value)]))))]
[#;locals is-local? get-local #;Local]
[#;captured is-captured? get-captured id]
)
(def: (is-ref? name scope)
(-> Text Scope Bool)
(or (is-local? name scope)
(is-captured? name scope)))
(def: (get-ref name scope)
(-> Text Scope (Maybe [Type Ref]))
(case (get-local name scope)
(#;Some type)
(#;Some type)
_
(get-captured name scope)))
(def: #export (find name)
(-> Text (Meta (Maybe [Type Ref])))
(function [compiler]
(let [[inner outer] (|> compiler
(get@ #;scopes)
(list;split-with (|>. (is-ref? name) not)))]
(case outer
#;Nil
(#;Right [compiler #;None])
(#;Cons top-outer _)
(let [[ref-type init-ref] (maybe;default (undefined)
(get-ref name top-outer))
[ref inner'] (list/fold (: (-> Scope [Ref (List Scope)] [Ref (List Scope)])
(function [scope [ref inner]]
[(#;Captured (get@ [#;captured #;counter] scope))
(#;Cons (update@ #;captured
(: (-> Captured Captured)
(|>. (update@ #;counter n.inc)
(update@ #;mappings (&;pl-put name [ref-type ref]))))
scope)
inner)]))
[init-ref #;Nil]
(list;reverse inner))
scopes (list/compose inner' outer)]
(#;Right [(set@ #;scopes scopes compiler)
(#;Some [ref-type ref])]))
))))
(def: #export (with-local [name type] action)
(All [a] (-> [Text Type] (Meta a) (Meta a)))
(function [compiler]
(case (get@ #;scopes compiler)
(#;Cons head tail)
(let [old-mappings (get@ [#;locals #;mappings] head)
new-var-id (get@ [#;locals #;counter] head)
new-head (update@ #;locals
(: (-> Locals Locals)
(|>. (update@ #;counter n.inc)
(update@ #;mappings (&;pl-put name [type new-var-id]))))
head)]
(case (meta;run' (set@ #;scopes (#;Cons new-head tail) compiler)
action)
(#e;Success [compiler' output])
(case (get@ #;scopes compiler')
(#;Cons head' tail')
(let [scopes' (#;Cons (set@ #;locals (get@ #;locals head) head')
tail')]
(#e;Success [(set@ #;scopes scopes' compiler')
output]))
_
(error! "Invalid scope alteration."))
(#e;Error error)
(#e;Error error)))
_
(#e;Error "Cannot create local binding without a scope."))
))
(do-template [<name> <val-type>]
[(def: <name>
(Bindings Text [Type <val-type>])
{#;counter +0
#;mappings (list)})]
[init-locals Nat]
[init-captured Ref]
)
(def: (scope parent-name child-name)
(-> (List Text) Text Scope)
{#;name (list& child-name parent-name)
#;inner +0
#;locals init-locals
#;captured init-captured})
(def: #export (with-scope name action)
(All [a] (-> Text (Meta a) (Meta a)))
(function [compiler]
(let [parent-name (case (get@ #;scopes compiler)
#;Nil
(list)
(#;Cons top _)
(get@ #;name top))]
(case (action (update@ #;scopes
(|>. (#;Cons (scope parent-name name)))
compiler))
(#e;Error error)
(#e;Error error)
(#e;Success [compiler' output])
(#e;Success [(update@ #;scopes
(|>. list;tail (maybe;default (list)))
compiler')
output])
))
))
(def: #export next-local
(Meta Nat)
(function [compiler]
(case (get@ #;scopes compiler)
#;Nil
(#e;Error "Cannot get next reference when there is no scope.")
(#;Cons top _)
(#e;Success [compiler (get@ [#;locals #;counter] top)]))))
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