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(.module:
[lux (#- Scope)
[abstract
[monad (#+ Monad do)]]
[control
["ex" exception (#+ exception:)]
["<>" parser ("#@." monad)
["<c>" code (#+ Parser)]]]
[data
["." name ("#@." codec)]
["." text ("#@." equivalence monoid)]
[collection
["." list ("#@." functor monoid)]
["." stack (#+ Stack)]]]
["." macro ("#@." monad)
["." code]
[syntax (#+ syntax:)
["cs" common
["csr" reader]
["csw" writer]]]]
[type (#+ :cast)]])
(type: Scope
{#name Text
#type-vars (List Code)
#abstraction Code
#representation Code})
(def: scopes
(Stack Scope)
stack.empty)
(template: (!peek <source> <reference> <then>)
(loop [entries <source>]
(case entries
(#.Cons [head-name head] tail)
(if (text@= <reference> head-name)
<then>
(recur tail))
#.Nil
(undefined))))
(def: (peek-scopes-definition reference source)
(-> Text (List [Text Global]) (Stack Scope))
(!peek source reference
(case head
(#.Left _)
(undefined)
(#.Right [exported? scope-type scope-anns scope-value])
(:coerce (Stack Scope) scope-value))))
(def: (peek-scopes reference definition-reference source)
(-> Text Text (List [Text Module]) (Stack Scope))
(!peek source reference
(peek-scopes-definition definition-reference (get@ #.definitions head))))
(exception: #export (no-active-scopes)
"")
(def: (peek! scope)
(-> (Maybe Text) (Meta Scope))
(function (_ compiler)
(let [[reference definition-reference] (name-of ..scopes)
current-scopes (peek-scopes reference definition-reference (get@ #.modules compiler))]
(case (case scope
(#.Some scope)
(list.find (function (_ [actual _])
(text@= scope actual))
current-scopes)
#.None
(stack.peek current-scopes))
(#.Some scope)
(#.Right [compiler scope])
#.None
(ex.throw no-active-scopes [])))))
(template: (!push <source> <reference> <then>)
(loop [entries <source>]
(case entries
(#.Cons [head-name head] tail)
(if (text@= <reference> head-name)
(#.Cons [head-name <then>]
tail)
(#.Cons [head-name head]
(recur tail)))
#.Nil
(undefined))))
(def: (push-scope-definition reference scope source)
(-> Text Scope (List [Text Global]) (List [Text Global]))
(!push source reference
(case head
(#.Left _)
(undefined)
(#.Right [exported? scopes-type scopes-anns scopes-value])
(#.Right [exported?
scopes-type
scopes-anns
(stack.push scope (:coerce (Stack Scope) scopes-value))]))))
(def: (push-scope [module-reference definition-reference] scope source)
(-> Name Scope (List [Text Module]) (List [Text Module]))
(!push source module-reference
(|> head (update@ #.definitions (push-scope-definition definition-reference scope)))))
(def: (push! scope)
(-> Scope (Meta Any))
(function (_ compiler)
(#.Right [(update@ #.modules
(..push-scope (name-of ..scopes) scope)
compiler)
[]])))
(def: (pop-scope-definition reference source)
(-> Text (List [Text Global]) (List [Text Global]))
(!push source reference
(case head
(#.Left _)
(undefined)
(#.Right [exported? scopes-type scopes-anns scopes-value])
(#.Right [exported?
scopes-type
scopes-anns
(let [current-scopes (:coerce (Stack Scope) scopes-value)]
(case (stack.pop current-scopes)
(#.Some current-scopes')
current-scopes'
#.None
current-scopes))]))))
(def: (pop-scope [module-reference definition-reference] source)
(-> Name (List [Text Module]) (List [Text Module]))
(!push source module-reference
(|> head (update@ #.definitions (pop-scope-definition definition-reference)))))
(syntax: (pop!)
(function (_ compiler)
(#.Right [(update@ #.modules
(..pop-scope (name-of ..scopes))
compiler)
(list)])))
(def: cast
(Parser [(Maybe Text) Code])
(<>.either (<>.and (<>.maybe <c>.local-identifier) <c>.any)
(<>.and (<>@wrap #.None) <c>.any)))
(template [<name> <from> <to>]
[(syntax: #export (<name> {[scope value] cast})
(do @
[[name type-vars abstraction representation] (peek! scope)]
(wrap (list (` ((~! :cast) [(~+ type-vars)] (~ <from>) (~ <to>)
(~ value)))))))]
[:abstraction representation abstraction]
[:representation abstraction representation]
)
(def: abstraction-type-name
(-> Name Text)
(|>> name@encode
($_ text@compose
(name@encode (name-of #..Abstraction))
" ")))
(def: representation-definition-name
(-> Text Text)
(|>> ($_ text@compose
(name@encode (name-of #Representation))
" ")))
(def: declaration
(Parser [Text (List Text)])
(<>.either (<c>.form (<>.and <c>.local-identifier (<>.some <c>.local-identifier)))
(<>.and <c>.local-identifier (:: <>.monad wrap (list)))))
## TODO: Make sure the generated code always gets optimized away.
## (This applies to uses of ":abstraction" and ":representation")
(syntax: #export (abstract:
{export csr.export}
{[name type-vars] declaration}
{annotations (<>.default cs.empty-annotations csr.annotations)}
representation-type
{primitives (<>.some <c>.any)})
(do @
[current-module macro.current-module-name
#let [type-varsC (list@map code.local-identifier type-vars)
abstraction-declaration (` ((~ (code.local-identifier name)) (~+ type-varsC)))
representation-declaration (` ((~ (code.local-identifier (representation-definition-name name)))
(~+ type-varsC)))]
_ (..push! [name
type-varsC
abstraction-declaration
representation-declaration])]
(wrap (list& (` (type: (~+ (csw.export export)) (~ abstraction-declaration)
(~ (csw.annotations annotations))
(primitive (~ (code.text (abstraction-type-name [current-module name])))
[(~+ type-varsC)])))
(` (type: (~ representation-declaration)
(~ representation-type)))
($_ list@compose
primitives
(list (` ((~! ..pop!)))))))))
(syntax: #export (:transmutation value)
(wrap (list (` (..:abstraction (..:representation (~ value)))))))
(syntax: #export (^:representation {name (<c>.form <c>.local-identifier)}
body
{branches (<>.some <c>.any)})
(let [g!var (code.local-identifier name)]
(wrap (list& g!var
(` (.let [(~ g!var) (..:representation (~ g!var))]
(~ body)))
branches))))
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