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|
(.module:
lux
(lux (control monad)
(data [text "text/" Eq<Text>]
text/format
[maybe "maybe/" Monad<Maybe>]
[product]
["e" error]
(coll [list "list/" Functor<List> Fold<List> Monoid<List>]))
[macro])
(luxc ["&" lang]
(lang [".L" variable #+ Variable])))
(type: Locals (Bindings Text [Type Nat]))
(type: Captured (Bindings Text [Type Ref]))
(def: (is-local? name scope)
(-> Text Scope Bool)
(|> scope
(get@ [#.locals #.mappings])
(&.pl-contains? name)))
(def: (get-local name scope)
(-> Text Scope (Maybe [Type Ref]))
(|> scope
(get@ [#.locals #.mappings])
(&.pl-get name)
(maybe/map (function [[type value]]
[type (#.Local value)]))))
(def: (is-captured? name scope)
(-> Text Scope Bool)
(|> scope
(get@ [#.captured #.mappings])
(&.pl-contains? name)))
(def: (get-captured name scope)
(-> Text Scope (Maybe [Type Ref]))
(loop [idx +0
mappings (get@ [#.captured #.mappings] scope)]
(case mappings
#.Nil
#.None
(#.Cons [_name [_source-type _source-ref]] mappings')
(if (text/= name _name)
(#.Some [_source-type (#.Captured idx)])
(recur (n/inc idx) mappings')))))
(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 (product.left ref+inner)]))))
scope)
(product.right ref+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 (macro.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)]))))
|
