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(.module:
lux
(lux (control [monad #+ do]
["ex" exception #+ exception:])
(data [number]
[text]
text/format
(coll [list "list/" Functor<List> Fold<List>]
(set ["set" unordered #+ Set])))
[macro #+ "meta/" Monad<Meta>]
(macro [code]))
(luxc [lang]
(lang [".L" variable #+ Register Variable]
["ls" synthesis #+ Synthesis Path]
(host ["_" common-lisp #+ Expression Handler SVar @@])))
[//]
(// [".T" runtime]
[".T" primitive]
[".T" reference]))
(def: #export (translate-let translate register valueS bodyS)
(-> (-> Synthesis (Meta Expression)) Register Synthesis Synthesis
(Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)
bodyO (translate bodyS)
#let [$register (referenceT.variable register)]]
(wrap (_.let (list [$register valueO])
bodyO))))
(def: #export (translate-record-get translate valueS pathP)
(-> (-> Synthesis (Meta Expression)) Synthesis (List [Nat Bit])
(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 (_.int (:coerce Int idx)))))
valueO
pathP))))
(def: #export (translate-if testO thenO elseO)
(-> Expression Expression Expression Expression)
(_.if testO thenO elseO))
(def: $savepoint (_.var "lux_pm_cursor_savepoint"))
(def: $cursor (_.var "lux_pm_cursor"))
(def: top _.length)
(def: (push! value var)
(-> Expression SVar Expression)
(_.setq! var (_.cons value (@@ var))))
(def: (pop! var)
(-> SVar Expression)
(_.setq! var (@@ var)))
(def: (push-cursor! value)
(-> Expression Expression)
(push! value $cursor))
(def: save-cursor!
Expression
(push! (@@ $cursor) $savepoint))
(def: restore-cursor!
Expression
(_.setq! $cursor (_.car (@@ $savepoint))))
(def: cursor-top
Expression
(_.car (@@ $cursor)))
(def: pop-cursor!
Expression
(pop! $cursor))
(def: pm-error (_.string "PM-ERROR"))
(def: fail-pm! (_.error pm-error))
(def: $temp (_.var "lux_pm_temp"))
(exception: #export (Unrecognized-Path {message Text})
message)
(def: $alt_error (_.var "alt_error"))
(def: (pm-catch handler)
(-> Expression Handler)
[(_.bool true) $alt_error
(_.progn
(list
(_.setq! $alt_error (_.format/3 _.nil (_.string "~A") (@@ $alt_error)))
(_.if (|> (@@ $alt_error) (_.equal pm-error))
handler
(_.error (@@ $alt_error)))))])
(def: (translate-pattern-matching' translate pathP)
(-> (-> Synthesis (Meta Expression)) Path (Meta Expression))
(case pathP
(^code ("lux case exec" (~ bodyS)))
(do macro.Monad<Meta>
[bodyO (translate bodyS)]
(wrap bodyO))
(^code ("lux case pop"))
(meta/wrap pop-cursor!)
(^code ("lux case bind" (~ [_ (#.Nat register)])))
(meta/wrap (_.setq! (referenceT.variable register) cursor-top))
(^template [<tag> <format> <=>]
[_ (<tag> value)]
(meta/wrap (_.when (|> value <format> (<=> cursor-top) _.not)
fail-pm!)))
([#.Bit _.bool _.equal]
[#.Nat (<| _.int (:coerce Int)) _.=]
[#.Int _.int _.=]
[#.Rev (<| _.int (:coerce Int)) _.=]
[#.Frac _.float _.=]
[#.Text _.string _.equal])
(^template [<pm> <getter>]
(^code (<pm> (~ [_ (#.Nat idx)])))
(meta/wrap (push-cursor! (<getter> cursor-top (_.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 (_.progn (list (_.setq! $temp (runtimeT.sum//get cursor-top (_.int (:coerce Int idx)) <flag>))
(_.if (_.null (@@ $temp))
fail-pm!
(push-cursor! (@@ $temp)))))))
(["lux case variant left" _.nil]
["lux case variant right" (_.string "")])
(^code ("lux case seq" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftO (translate-pattern-matching' translate leftP)
rightO (translate-pattern-matching' translate rightP)]
(wrap (_.progn (list leftO
rightO))))
(^code ("lux case alt" (~ leftP) (~ rightP)))
(do macro.Monad<Meta>
[leftO (translate-pattern-matching' translate leftP)
rightO (translate-pattern-matching' translate rightP)]
(wrap (runtimeT.with-vars [error]
(_.handler-case
(list (pm-catch (_.progn (list restore-cursor!
rightO))))
(_.progn (list save-cursor!
leftO))))))
_
(lang.throw Unrecognized-Path (%code pathP))
))
(def: (translate-pattern-matching translate pathP)
(-> (-> Synthesis (Meta Expression)) Path (Meta Expression))
(do macro.Monad<Meta>
[pattern-matching! (translate-pattern-matching' translate pathP)]
(wrap (_.handler-case
(list (pm-catch (_.error (_.string "Invalid expression for pattern-matching."))))
pattern-matching!))))
(def: (initialize-pattern-matching! stack-init body)
(-> Expression Expression Expression)
(_.let (list [$cursor (_.list (list stack-init))]
[$savepoint (_.list (list))]
[$temp _.nil])
body))
(def: #export (translate-case translate valueS pathP)
(-> (-> Synthesis (Meta Expression)) Synthesis Path (Meta Expression))
(do macro.Monad<Meta>
[valueO (translate valueS)
pattern-matching! (translate-pattern-matching translate pathP)]
(wrap (<| (initialize-pattern-matching! valueO)
pattern-matching!))))
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