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(.module:
lux
(lux (control [monad #+ do]
["ex" exception #+ exception:])
(data text/format
(coll [list "list/" Fold<List>]))
[macro #+ "meta/" Monad<Meta>])
(luxc [lang]
(lang ["ls" synthesis]
(host [lua #+ Lua Expression Statement])))
[//]
(// [".T" runtime]
[".T" primitive]
[".T" reference]))
(def: (expression-block body)
(-> Statement Expression)
(lua.apply (lua.function (list)
body)
(list)))
(def: #export (translate-let translate register valueS bodyS)
(-> (-> ls.Synthesis (Meta Expression)) Nat ls.Synthesis ls.Synthesis
(Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)
bodyO (translate bodyS)]
(wrap (expression-block
(lua.block! (list (lua.local! (referenceT.variable register) (#.Some valueO))
(lua.return! bodyO)))))))
(def: #export (translate-record-get translate valueS path)
(-> (-> ls.Synthesis (Meta Expression)) ls.Synthesis (List [Nat Bool])
(Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)]
(wrap (list/fold (function (_ [idx tail?] source)
(let [method (if tail?
runtimeT.product//right
runtimeT.product//left)]
(method source (lua.int (:coerce Int idx)))))
valueO
path))))
(def: #export (translate-if testO thenO elseO)
(-> Expression Expression Expression Expression)
(expression-block
(lua.if! testO
(lua.return! thenO)
(lua.return! elseO))))
(def: savepoint
Expression
"pm_cursor_savepoint")
(def: cursor
Expression
"pm_cursor")
(def: (push-cursor! value)
(-> Expression Expression)
(lua.apply "table.insert" (list cursor value)))
(def: save-cursor!
Statement
(lua.apply "table.insert" (list savepoint (runtimeT.array//copy cursor))))
(def: restore-cursor!
Statement
(lua.set! cursor (lua.apply "table.remove" (list savepoint))))
(def: cursor-top
Expression
(lua.nth (lua.length cursor) cursor))
(def: pop-cursor!
Statement
(lua.apply "table.remove" (list cursor)))
(def: pm-error
Expression
(lua.string "PM-ERROR"))
(exception: #export (Unrecognized-Path {message Text})
message)
(def: (translate-pattern-matching' translate path)
(-> (-> ls.Synthesis (Meta Expression)) Code (Meta Expression))
(case path
(^code ("lux case exec" (~ bodyS)))
(do macro.Monad<Meta>
[bodyO (translate bodyS)]
(wrap (lua.return! bodyO)))
(^code ("lux case pop"))
(meta/wrap pop-cursor!)
(^code ("lux case bind" (~ [_ (#.Nat register)])))
(meta/wrap (lua.local! (referenceT.variable register) (#.Some cursor-top)))
(^template [<tag> <format>]
[_ (<tag> value)]
(meta/wrap (lua.when! (lua.not (lua.= (|> value <format>) cursor-top))
(lua.return! pm-error))))
([#.Nat (<| lua.int (:coerce Int))]
[#.Int lua.int]
[#.Rev (<| lua.int (:coerce Int))]
[#.Bool lua.bool]
[#.Frac lua.float]
[#.Text lua.string])
(^template [<pm> <getter>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap (push-cursor! (<getter> cursor-top (lua.int (:coerce Int idx))))))
(["lux case tuple left" runtimeT.product//left]
["lux case tuple right" runtimeT.product//right])
(^template [<pm> <flag>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap (lua.block! (list (lua.set! "temp" (runtimeT.sum//get cursor-top (lua.int (:coerce Int idx)) <flag>))
(lua.if! (lua.= lua.nil "temp")
(lua.return! pm-error)
(push-cursor! "temp"))))))
(["lux case variant left" lua.nil]
["lux case variant right" (lua.string "")])
(^code ("lux case seq" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftO (translate-pattern-matching' translate leftP)
rightO (translate-pattern-matching' translate rightP)]
(wrap (lua.block! (list leftO rightO))))
(^code ("lux case alt" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftO (translate-pattern-matching' translate leftP)
rightO (translate-pattern-matching' translate rightP)]
(wrap (lua.block! (list (format "local alt_success, alt_value = " (lua.apply "pcall" (list (lua.function (list)
(lua.block! (list save-cursor!
leftO))))) ";")
(lua.if! "alt_success"
(lua.return! "alt_value")
(lua.if! (lua.= pm-error "alt_value")
(lua.block! (list restore-cursor!
rightO))
(lua.error "alt_value")))))))
_
(lang.throw Unrecognized-Path (%code path))
))
(def: (translate-pattern-matching translate path)
(-> (-> ls.Synthesis (Meta Expression)) Code (Meta Expression))
(do macro.Monad<Meta>
[pattern-matching (translate-pattern-matching' translate path)]
(wrap (lua.block! (list (format "local success, value = pcall(function () " pattern-matching " end);")
(lua.if! "success"
(lua.return! "value")
(lua.if! (lua.= pm-error "value")
(lua.error (lua.string "Invalid expression for pattern-matching."))
(lua.error "value"))))))))
(def: (initialize-pattern-matching stack-init)
(-> Expression Statement)
(lua.block! (list (lua.local! "temp" #.None)
(lua.local! cursor (#.Some (lua.array (list stack-init))))
(lua.local! savepoint (#.Some (lua.array (list)))))))
(def: #export (translate-case translate valueS path)
(-> (-> ls.Synthesis (Meta Expression)) ls.Synthesis Code (Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)
pattern-matching (translate-pattern-matching translate path)]
(wrap (expression-block
(lua.block! (list (initialize-pattern-matching valueO)
pattern-matching))))))
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