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|
(.using
[library
[lux "*"
["[0]" meta]
[abstract
[monad {"+" Monad do}]]
[control
["[0]" exception {"+" exception:}]
["<>" parser ("[1]#[0]" monad)
["<[0]>" code {"+" Parser}]]]
[data
["[0]" text ("[1]#[0]" equivalence monoid)]
[collection
["[0]" list ("[1]#[0]" functor monoid)]]]
[macro
["^" pattern]
["[0]" code]
[syntax {"+" syntax:}
["|[0]|" export]]]
[meta
["[0]" symbol ("[1]#[0]" codec)]]]]
["[0]" //])
(type: Stack
List)
(def: peek
(All (_ a) (-> (Stack a) (Maybe a)))
list.head)
(def: (push value stack)
(All (_ a) (-> a (Stack a) (Stack a)))
{.#Item value stack})
(def: pop
(All (_ a) (-> (Stack a) (Maybe (Stack a))))
list.tail)
(type: .public Frame
(Record
[#name Text
#type_vars (List Code)
#abstraction Code
#representation Code]))
(def: frames
(Stack Frame)
{.#End})
(template: (!peek <source> <reference> <then>)
[(loop (again [entries <source>])
(case entries
{.#Item [head_name head] tail}
(if (text#= <reference> head_name)
<then>
(again tail))
{.#End}
(undefined)))])
(def: (peek_frames_definition reference source)
(-> Text (List [Text Global]) (Stack Frame))
(!peek source reference
(case head
{.#Definition [exported? frame_type frame_value]}
(as (Stack Frame) frame_value)
(^.or {.#Type _}
{.#Alias _}
{.#Tag _}
{.#Slot _})
(undefined))))
(def: (peek_frames reference definition_reference source)
(-> Text Text (List [Text Module]) (Stack Frame))
(!peek source reference
(peek_frames_definition definition_reference (the .#definitions head))))
(exception: .public no_active_frames)
(def: (peek! frame)
(-> (Maybe Text) (Meta Frame))
(function (_ compiler)
(let [[reference definition_reference] (symbol ..frames)
current_frames (peek_frames reference definition_reference (the .#modules compiler))]
(case (case frame
{.#Some frame}
(list.example (function (_ [actual _])
(text#= frame actual))
current_frames)
{.#None}
(..peek current_frames))
{.#Some frame}
{.#Right [compiler frame]}
{.#None}
(exception.except ..no_active_frames [])))))
(def: .public current
(Meta Frame)
(..peek! {.#None}))
(def: .public (specific name)
(-> Text (Meta Frame))
(..peek! {.#Some name}))
(template: (!push <source> <reference> <then>)
[(loop (again [entries <source>])
(case entries
{.#Item [head_name head] tail}
(if (text#= <reference> head_name)
{.#Item [head_name <then>]
tail}
{.#Item [head_name head]
(again tail)})
{.#End}
(undefined)))])
(def: (push_frame_definition reference frame source)
(-> Text Frame (List [Text Global]) (List [Text Global]))
(!push source reference
(case head
{.#Definition [exported? frames_type frames_value]}
{.#Definition [exported?
frames_type
(..push frame (as (Stack Frame) frames_value))]}
(^.or {.#Type _}
{.#Alias _}
{.#Tag _}
{.#Slot _})
(undefined))))
(def: (push_frame [module_reference definition_reference] frame source)
(-> Symbol Frame (List [Text Module]) (List [Text Module]))
(!push source module_reference
(revised .#definitions (push_frame_definition definition_reference frame) head)))
(def: (push! frame)
(-> Frame (Meta Any))
(function (_ compiler)
{.#Right [(revised .#modules
(..push_frame (symbol ..frames) frame)
compiler)
[]]}))
(def: (pop_frame_definition reference source)
(-> Text (List [Text Global]) (List [Text Global]))
(!push source reference
(case head
{.#Definition [exported? frames_type frames_value]}
{.#Definition [exported?
frames_type
(let [current_frames (as (Stack Frame) frames_value)]
(case (..pop current_frames)
{.#Some current_frames'}
current_frames'
{.#None}
current_frames))]}
(^.or {.#Type _}
{.#Alias _}
{.#Tag _}
{.#Slot _})
(undefined))))
(def: (pop_frame [module_reference definition_reference] source)
(-> Symbol (List [Text Module]) (List [Text Module]))
(!push source module_reference
(|> head (revised .#definitions (pop_frame_definition definition_reference)))))
(syntax: (pop! [])
(function (_ compiler)
{.#Right [(revised .#modules
(..pop_frame (symbol ..frames))
compiler)
(list)]}))
(def: cast
(Parser [(Maybe Text) Code])
(<>.either (<>.and (<>.maybe <code>.local) <code>.any)
(<>.and (<>#in {.#None}) <code>.any)))
(template [<name> <from> <to>]
[(syntax: .public (<name> [[frame value] ..cast])
(do meta.monad
[[name type_vars abstraction representation] (peek! frame)]
(in (list (` ((~! //.as) [(~+ type_vars)] (~ <from>) (~ <to>)
(~ value)))))))]
[abstraction representation abstraction]
[representation abstraction representation]
)
(def: abstraction_type_name
(-> Symbol Text)
symbol#encoded)
(def: representation_definition_name
(-> Text Text)
(|>> (all text#composite
(symbol#encoded (symbol ..#Representation))
" ")))
(def: declaration
(Parser [Text (List Text)])
(<>.either (<code>.form (<>.and <code>.local (<>.some <code>.local)))
(<>.and <code>.local (# <>.monad in (list)))))
(def: abstract
(Parser [Code [Text (List Text)] Code (List Code)])
(|export|.parser
(all <>.and
..declaration
<code>.any
(<>.some <code>.any)
)))
... TODO: Make sure the generated code always gets optimized away.
... (This applies to uses of "abstraction" and "representation")
(syntax: .public (primitive: [[export_policy [name type_vars] representation_type primitives]
..abstract])
(do meta.monad
[current_module meta.current_module_name
.let [type_varsC (list#each code.local type_vars)
abstraction_declaration (` ((~ (code.local name)) (~+ type_varsC)))
representation_declaration (` ((~ (code.local (representation_definition_name name)))
(~+ type_varsC)))]
_ (..push! [name
type_varsC
abstraction_declaration
representation_declaration])]
(in (partial_list (` (type: (~ export_policy) (~ abstraction_declaration)
(Primitive (~ (code.text (abstraction_type_name [current_module name])))
[(~+ type_varsC)])))
(` (type: (~ representation_declaration)
(~ representation_type)))
(all list#composite
primitives
(list (` ((~! ..pop!)))))))))
(type: (Selection a)
(Variant
{#Specific Code a}
{#Current a}))
(def: (selection parser)
(All (_ a) (-> (Parser a) (Parser (Selection a))))
(<>.or (<>.and <code>.any parser)
parser))
(syntax: .public (transmutation [selection (..selection <code>.any)])
(case selection
{#Specific specific value}
(in (list (` (.|> (~ value)
(..representation (~ specific))
(..abstraction (~ specific))))))
{#Current value}
(in (list (` (.|> (~ value) ..representation ..abstraction))))))
|
