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|
(.require
[library
[lux (.except local with)
[abstract
[monad (.only do)]]
[control
["[0]" maybe (.use "[1]#[0]" monad)]
["[0]" try]
["[0]" exception (.only exception:)]]
[data
["[0]" text (.use "[1]#[0]" equivalence)]
["[0]" product]
[collection
["[0]" list (.use "[1]#[0]" functor mix monoid)]
[dictionary
["[0]" plist]]]]]]
["/" // (.only Environment Operation Phase)
[//
[phase
["[0]" extension]]
[///
["[0]" phase]
[reference
["[0]" variable (.only Register Variable)]]]]])
(type: Local
(Bindings Text [Type Register]))
(type: Foreign
(Bindings Text [Type Variable]))
(def (local? name scope)
(-> Text Scope Bit)
(|> scope
(the [.#locals .#mappings])
(plist.contains? name)))
(def (local name scope)
(-> Text Scope (Maybe [Type Variable]))
(|> scope
(the [.#locals .#mappings])
(plist.value name)
(maybe#each (function (_ [type value])
[type {variable.#Local value}]))))
(def (captured? name scope)
(-> Text Scope Bit)
(|> scope
(the [.#captured .#mappings])
(plist.contains? name)))
(def (captured name scope)
(-> Text Scope (Maybe [Type Variable]))
(loop (again [idx 0
mappings (the [.#captured .#mappings] scope)])
(case mappings
{.#Item [_name [_source_type _source_ref]] mappings'}
(if (text#= name _name)
{.#Some [_source_type {variable.#Foreign idx}]}
(again (++ idx) mappings'))
{.#End}
{.#None})))
(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 .public (variable name)
(-> Text (Operation (Maybe [Type Variable])))
(extension.lifted
(function (_ state)
(let [[inner outer] (|> state
(the .#scopes)
(list.split_when (|>> (reference? name))))]
(case outer
{.#End}
{.#Right [state {.#None}]}
{.#Item top_outer _}
(let [[ref_type init_ref] (maybe.else (undefined)
(..reference name top_outer))
[ref inner'] (list#mix (is (-> Scope [Variable (List Scope)] [Variable (List Scope)])
(function (_ scope ref+inner)
[{variable.#Foreign (the [.#captured .#counter] scope)}
{.#Item (revised .#captured
(is (-> Foreign Foreign)
(|>> (revised .#counter ++)
(revised .#mappings (plist.has name [ref_type (product.left ref+inner)]))))
scope)
(product.right ref+inner)}]))
[init_ref {.#End}]
(list.reversed inner))
scopes (list#composite inner' outer)]
{.#Right [(has .#scopes scopes state)
{.#Some [ref_type ref]}]})
)))))
(exception: .public no_scope)
(exception: .public drained)
(def .public (with_local [name type] action)
(All (_ a) (-> [Text Type] (Operation a) (Operation a)))
(function (_ [bundle state])
(case (the .#scopes state)
{.#Item head tail}
(let [old_mappings (the [.#locals .#mappings] head)
new_var_id (the [.#locals .#counter] head)
new_head (revised .#locals
(is (-> Local Local)
(|>> (revised .#counter ++)
(revised .#mappings (plist.has name [type new_var_id]))))
head)]
(case (phase.result' [bundle (has .#scopes {.#Item new_head tail} state)]
action)
{try.#Success [[bundle' state'] output]}
(case (the .#scopes state')
{.#Item head' tail'}
(let [scopes' {.#Item (has .#locals (the .#locals head) head')
tail'}]
{try.#Success [[bundle' (has .#scopes scopes' state')]
output]})
_
(exception.except ..drained []))
{try.#Failure error}
{try.#Failure error}))
_
(exception.except ..no_scope []))))
(def empty
Scope
(let [bindings (is Bindings
[.#counter 0
.#mappings (list)])]
[.#name (list)
.#inner 0
.#locals bindings
.#captured bindings]))
(def .public (reset action)
(All (_ a) (-> (Operation a) (Operation a)))
(function (_ [bundle state])
(case (action [bundle (has .#scopes (list ..empty) state)])
{try.#Success [[bundle' state'] output]}
{try.#Success [[bundle' (has .#scopes (the .#scopes state) state')]
output]}
failure
failure)))
(def .public (with action)
(All (_ a) (-> (Operation a) (Operation [Scope a])))
(function (_ [bundle state])
(case (action [bundle (revised .#scopes (|>> {.#Item ..empty}) state)])
{try.#Success [[bundle' state'] output]}
(case (the .#scopes state')
{.#Item head tail}
{try.#Success [[bundle' (has .#scopes tail state')]
[head output]]}
{.#End}
(exception.except ..drained []))
{try.#Failure error}
{try.#Failure error})))
(def .public next
(Operation Register)
(extension.lifted
(function (_ state)
(case (the .#scopes state)
{.#Item top _}
{try.#Success [state (the [.#locals .#counter] top)]}
{.#End}
(exception.except ..no_scope [])))))
(def .public environment
(-> Scope (Environment Variable))
(|>> (the [.#captured .#mappings])
(list#each (function (_ [_ [_ ref]]) ref))))
|
