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|
(.module:
[lux #*
[control
monad]
[data
[text ("text/." Equivalence<Text>)
format]
["." maybe ("maybe/." Monad<Maybe>)]
["." product]
["e" error]
[collection
["." list ("list/." Functor<List> Fold<List> Monoid<List>)]
[dictionary
["." plist]]]]]
[// (#+ Operation Phase)
["/." //
["." extension]
[//
["." reference (#+ Register Variable)]]]])
(type: Local (Bindings Text [Type Register]))
(type: Foreign (Bindings Text [Type Variable]))
(def: (local? name scope)
(-> Text Scope Bit)
(|> scope
(get@ [#.locals #.mappings])
(plist.contains? name)))
(def: (local name scope)
(-> Text Scope (Maybe [Type Variable]))
(|> scope
(get@ [#.locals #.mappings])
(plist.get name)
(maybe/map (function (_ [type value])
[type (#reference.Local value)]))))
(def: (captured? name scope)
(-> Text Scope Bit)
(|> scope
(get@ [#.captured #.mappings])
(plist.contains? name)))
(def: (captured name scope)
(-> Text Scope (Maybe [Type Variable]))
(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 (#reference.Foreign idx)])
(recur (inc idx) mappings')))))
(def: (reference? name scope)
(-> Text Scope Bit)
(or (local? name scope)
(captured? name scope)))
(def: (reference name scope)
(-> Text Scope (Maybe [Type Variable]))
(case (..local name scope)
(#.Some type)
(#.Some type)
_
(..captured name scope)))
(def: #export (find name)
(-> Text (Operation (Maybe [Type Variable])))
(extension.lift
(function (_ state)
(let [[inner outer] (|> state
(get@ #.scopes)
(list.split-with (|>> (reference? name) not)))]
(case outer
#.Nil
(#.Right [state #.None])
(#.Cons top-outer _)
(let [[ref-type init-ref] (maybe.default (undefined)
(..reference name top-outer))
[ref inner'] (list/fold (: (-> Scope [Variable (List Scope)] [Variable (List Scope)])
(function (_ scope ref+inner)
[(#reference.Foreign (get@ [#.captured #.counter] scope))
(#.Cons (update@ #.captured
(: (-> Foreign Foreign)
(|>> (update@ #.counter inc)
(update@ #.mappings (plist.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 state)
(#.Some [ref-type ref])]))
)))))
(def: #export (with-local [name type] action)
(All [a] (-> [Text Type] (Operation a) (Operation a)))
(function (_ [bundle state])
(case (get@ #.scopes state)
(#.Cons head tail)
(let [old-mappings (get@ [#.locals #.mappings] head)
new-var-id (get@ [#.locals #.counter] head)
new-head (update@ #.locals
(: (-> Local Local)
(|>> (update@ #.counter inc)
(update@ #.mappings (plist.put name [type new-var-id]))))
head)]
(case (///.run' [bundle (set@ #.scopes (#.Cons new-head tail) state)]
action)
(#e.Success [[bundle' state'] output])
(case (get@ #.scopes state')
(#.Cons head' tail')
(let [scopes' (#.Cons (set@ #.locals (get@ #.locals head) head')
tail')]
(#e.Success [[bundle' (set@ #.scopes scopes' state')]
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 Variable]
)
(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 (Operation a) (Operation a)))
(function (_ [bundle state])
(let [parent-name (case (get@ #.scopes state)
#.Nil
(list)
(#.Cons top _)
(get@ #.name top))]
(case (action [bundle (update@ #.scopes
(|>> (#.Cons (scope parent-name name)))
state)])
(#e.Error error)
(#e.Error error)
(#e.Success [[bundle' state'] output])
(#e.Success [[bundle' (update@ #.scopes
(|>> list.tail (maybe.default (list)))
state')]
output])
))
))
(def: #export next-local
(Operation Register)
(extension.lift
(function (_ state)
(case (get@ #.scopes state)
#.Nil
(#e.Error "Cannot get next reference when there is no scope.")
(#.Cons top _)
(#e.Success [state (get@ [#.locals #.counter] top)])))))
(def: (ref-to-variable ref)
(-> Ref Variable)
(case ref
(#.Local register)
(#reference.Local register)
(#.Captured register)
(#reference.Foreign register)))
(def: #export (environment scope)
(-> Scope (List Variable))
(|> scope
(get@ [#.captured #.mappings])
(list/map (function (_ [_ [_ ref]]) (ref-to-variable ref)))))
|
