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|
(.module:
[library
[lux {"-" [local]}
[abstract
monad]
[control
["." maybe ("#\." monad)]
["." try]
["." exception {"+" [exception:]}]]
[data
["." text ("#\." equivalence)]
["." product]
[collection
["." list ("#\." functor mix monoid)]
[dictionary
["." plist]]]]]]
["." /// "_"
["#." extension]
[//
["/" analysis {"+" [Operation Phase]}]
[///
[reference
["." variable {"+" [Register Variable]}]]
["#" phase]]]])
(type: Local
(Bindings Text [Type Register]))
(type: Foreign
(Bindings Text [Type Variable]))
(def: (local? name scope)
(-> Text Scope Bit)
(|> scope
(value@ [#.locals #.mappings])
(plist.contains? name)))
(def: (local name scope)
(-> Text Scope (Maybe [Type Variable]))
(|> scope
(value@ [#.locals #.mappings])
(plist.value name)
(maybe\each (function (_ [type value])
[type (#variable.Local value)]))))
(def: (captured? name scope)
(-> Text Scope Bit)
(|> scope
(value@ [#.captured #.mappings])
(plist.contains? name)))
(def: (captured name scope)
(-> Text Scope (Maybe [Type Variable]))
(loop [idx 0
mappings (value@ [#.captured #.mappings] scope)]
(case mappings
(#.Item [_name [_source_type _source_ref]] mappings')
(if (text\= name _name)
(#.Some [_source_type (#variable.Foreign idx)])
(recur (++ 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 (find name)
(-> Text (Operation (Maybe [Type Variable])))
(///extension.lifted
(function (_ state)
(let [[inner outer] (|> state
(value@ #.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 (: (-> Scope [Variable (List Scope)] [Variable (List Scope)])
(function (_ scope ref+inner)
[(#variable.Foreign (value@ [#.captured #.counter] scope))
(#.Item (revised@ #.captured
(: (-> 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 [(with@ #.scopes scopes state)
(#.Some [ref_type ref])]))
)))))
(exception: .public cannot_create_local_binding_without_a_scope)
(exception: .public invalid_scope_alteration)
(def: .public (with_local [name type] action)
(All (_ a) (-> [Text Type] (Operation a) (Operation a)))
(function (_ [bundle state])
(case (value@ #.scopes state)
(#.Item head tail)
(let [old_mappings (value@ [#.locals #.mappings] head)
new_var_id (value@ [#.locals #.counter] head)
new_head (revised@ #.locals
(: (-> Local Local)
(|>> (revised@ #.counter ++)
(revised@ #.mappings (plist.has name [type new_var_id]))))
head)]
(case (///.result' [bundle (with@ #.scopes (#.Item new_head tail) state)]
action)
(#try.Success [[bundle' state'] output])
(case (value@ #.scopes state')
(#.Item head' tail')
(let [scopes' (#.Item (with@ #.locals (value@ #.locals head) head')
tail')]
(#try.Success [[bundle' (with@ #.scopes scopes' state')]
output]))
_
(exception.except ..invalid_scope_alteration []))
(#try.Failure error)
(#try.Failure error)))
_
(exception.except ..cannot_create_local_binding_without_a_scope []))
))
(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: .public (with_scope name action)
(All (_ a) (-> Text (Operation a) (Operation a)))
(function (_ [bundle state])
(let [parent_name (case (value@ #.scopes state)
#.End
(list)
(#.Item top _)
(value@ #.name top))]
(case (action [bundle (revised@ #.scopes
(|>> (#.Item (scope parent_name name)))
state)])
(#try.Success [[bundle' state'] output])
(#try.Success [[bundle' (revised@ #.scopes
(|>> list.tail (maybe.else (list)))
state')]
output])
(#try.Failure error)
(#try.Failure error)))))
(exception: .public cannot_get_next_reference_when_there_is_no_scope)
(def: .public next_local
(Operation Register)
(///extension.lifted
(function (_ state)
(case (value@ #.scopes state)
(#.Item top _)
(#try.Success [state (value@ [#.locals #.counter] top)])
#.End
(exception.except ..cannot_get_next_reference_when_there_is_no_scope [])))))
(def: (ref_variable ref)
(-> Ref Variable)
(case ref
(#.Local register)
(#variable.Local register)
(#.Captured register)
(#variable.Foreign register)))
(def: .public (environment scope)
(-> Scope (List Variable))
(|> scope
(value@ [#.captured #.mappings])
(list\each (function (_ [_ [_ ref]]) (ref_variable ref)))))
|
