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|
(.module:
lux
(lux (control [monad #+ do]
["ex" exception #+ exception:]
["p" parser]
pipe)
(data [maybe]
["e" error #+ Error]
[text "text/" Eq<Text>]
text/format
(format [xml #+ XML]
[json #+ JSON])
(coll [array]
[list "list/" Functor<List>]
[dict]))
(time [instant #+ Instant]
[duration #+ Duration]
[date #+ Date])
[function #+ const]
[macro]
(macro [code]
[poly #+ Poly])
(lang [syntax #+ Aliases]
[type]
(type [check]))
(concurrency [promise]
[task #+ Task])
[io]
(world [file #+ File]
[console #+ Console]))
(luxc [lang]
(lang [".L" module]
[".L" scope]
[".L" host]
[".L" translation]
[".L" eval]
(translation [".T" runtime]))))
(exception: #export REPL-Initialization-Failed)
(exception: #export REPL-Error)
(def: repl-module "<REPL>")
(def: no-aliases Aliases (dict.new text.Hash<Text>))
(def: (initialize source-dirs target-dir console)
(-> (List File) File Console (Task Compiler))
(do promise.Monad<Promise>
[output (promise.future
(do io.Monad<IO>
[host hostL.init-host]
(case (macro.run' (translationL.init-compiler host)
(moduleL.with-module +0 repl-module
runtimeT.translate))
(#e.Success [compiler _])
(translationL.translate-module source-dirs target-dir translationL.prelude compiler)
(#e.Error error)
(wrap (#e.Error error)))))]
(case output
(#e.Success compiler)
(do task.Monad<Task>
[_ (console.write (format "\nWelcome to the REPL!\n"
"Type \"exit\" to leave.\n\n")
console)]
(wrap compiler))
(#e.Error message)
(task.throw REPL-Initialization-Failed message))))
(def: (add-line line [where offset input])
(-> Text Source Source)
[where offset (format input "\n" line)])
(type: Representation (-> Top Text))
(def: (represent-together representations values)
(-> (List Representation) (List Top) (List Text))
(|> (list.zip2 representations values)
(list/map (function [[representation value]] (representation value)))))
(def: primitive-representation
(Poly Representation)
(`` ($_ p.either
(do p.Monad<Parser>
[_ poly.unit]
(wrap (const "[]")))
(~~ (do-template [<parser> <type> <formatter>]
[(do p.Monad<Parser>
[_ <parser>]
(wrap (|>> (:! <type>) <formatter>)))]
[poly.bool Bool %b]
[poly.nat Nat %n]
[poly.int Int %i]
[poly.deg Deg %d]
[poly.frac Frac %f]
[poly.text Text %t])))))
(def: (special-representation representation)
(-> (Poly Representation) (Poly Representation))
(`` ($_ p.either
(~~ (do-template [<type> <formatter>]
[(do p.Monad<Parser>
[_ (poly.this <type>)]
(wrap (|>> (:! <type>) <formatter>)))]
[Type %type]
[Code %code]
[Instant %instant]
[Duration %duration]
[Date %date]
[JSON %json]
[XML %xml]
))
(do p.Monad<Parser>
[[_ elemT] (poly.apply (p.seq (poly.this List) poly.any))
elemR (poly.local (list elemT) representation)]
(wrap (|>> (:! (List Top)) (%list elemR))))
(do p.Monad<Parser>
[[_ elemT] (poly.apply (p.seq (poly.this Maybe) poly.any))
elemR (poly.local (list elemT) representation)]
(wrap (|>> (:! (Maybe Top))
(case> #.None
"#.None"
(#.Some elemV)
(format "(#.Some " (elemR elemV) ")"))))))))
(def: (record-representation tags representation)
(-> (List Ident) (Poly Representation) (Poly Representation))
(do p.Monad<Parser>
[membersR+ (poly.tuple (p.many representation))
_ (p.assert "Number of tags does not match record type size."
(n/= (list.size tags) (list.size membersR+)))]
(wrap (function [recordV]
(let [record-body (loop [pairs-left (list.zip2 tags membersR+)
recordV recordV]
(case pairs-left
#.Nil
""
(#.Cons [tag repr] #.Nil)
(format (%code (code.tag tag)) " " (repr recordV))
(#.Cons [tag repr] tail)
(let [[leftV rightV] (:! [Top Top] recordV)]
(format (%code (code.tag tag)) " " (repr leftV) " "
(recur tail rightV)))))]
(format "{" record-body "}"))))))
(def: (variant-representation tags representation)
(-> (List Ident) (Poly Representation) (Poly Representation))
(do p.Monad<Parser>
[casesR+ (poly.variant (p.many representation))
#let [num-tags (list.size tags)]
_ (p.assert "Number of tags does not match variant type size."
(n/= num-tags (list.size casesR+)))]
(wrap (function [variantV]
(loop [cases-left (list.zip3 tags
(list.n/range +0 (n/dec num-tags))
casesR+)
variantV variantV]
(case cases-left
#.Nil
""
(#.Cons [tag-name tag-idx repr] #.Nil)
(let [[_tag _last? _value] (:! [Nat Text Top] variantV)]
(if (n/= tag-idx _tag)
(format "(" (%code (code.tag tag-name)) " " (repr _value) ")")
(undefined)))
(#.Cons [tag-name tag-idx repr] tail)
(let [[_tag _last? _value] (:! [Nat Text Top] variantV)]
(if (n/= tag-idx _tag)
(format "(" (%code (code.tag tag-name)) " " (repr _value) ")")
(recur tail variantV)))))))))
(def: (tagged-representation compiler representation)
(-> Compiler (Poly Representation) (Poly Representation))
(do p.Monad<Parser>
[[name anonymous] poly.named]
(case (macro.run compiler (macro.tags-of name))
(#e.Success ?tags)
(case ?tags
(#.Some tags)
(poly.local (list anonymous)
(p.either (record-representation tags representation)
(variant-representation tags representation)))
#.None
representation)
(#e.Error error)
(p.fail error))))
(def: (tuple-representation representation)
(-> (Poly Representation) (Poly Representation))
(do p.Monad<Parser>
[membersR+ (poly.tuple (p.many representation))]
(wrap (function [tupleV]
(let [tuple-body (loop [representations membersR+
tupleV tupleV]
(case representations
#.Nil
""
(#.Cons lastR #.Nil)
(lastR tupleV)
(#.Cons headR tailR)
(let [[leftV rightV] (:! [Top Top] tupleV)]
(format (headR leftV) " " (recur tailR rightV)))))]
(format "[" tuple-body "]"))))))
(def: (representation compiler)
(-> Compiler (Poly Representation))
(p.rec
(function [representation]
($_ p.either
primitive-representation
(special-representation representation)
(tagged-representation compiler representation)
(tuple-representation representation)
(do p.Monad<Parser>
[[funcT inputsT+] (poly.apply (p.seq poly.any (p.many poly.any)))]
(case (type.apply inputsT+ funcT)
(#.Some outputT)
(poly.local (list outputT) representation)
#.None
(p.fail "")))
(do p.Monad<Parser>
[[name anonymous] poly.named]
(poly.local (list anonymous) representation))
(p.fail "")
))))
(def: (represent compiler type value)
(-> Compiler Type Top Text)
(case (poly.run type (representation compiler))
(#e.Success representation)
(representation value)
(#e.Error error)
". . . cannot represent value . . ."))
(def: (repl-translate source-dirs target-dir code)
(-> (List File) File Code (Meta [Type Top]))
(function [compiler]
(case ((translationL.translate (translationL.translate-module source-dirs target-dir)
no-aliases
code)
compiler)
(#e.Success [compiler' aliases'])
(#e.Success [compiler' [Void []]])
(#e.Error error)
(if (ex.match? translationL.Unrecognized-Statement error)
((do macro.Monad<Meta>
[[var-id varT] (lang.with-type-env check.var)
exprV (scopeL.with-scope repl-module
(evalL.eval varT code))
?exprT (lang.with-type-env (check.read var-id))]
(wrap [(maybe.assume ?exprT) exprV]))
compiler)
(#e.Error error)))))
(def: fresh-source Source [[repl-module +1 +0] +0 ""])
(def: #export (run source-dirs target-dir)
(-> (List File) File (Task Unit))
(do task.Monad<Task>
[console (promise.future console.open)
compiler (initialize source-dirs target-dir console)]
(loop [compiler compiler
source fresh-source
multi-line? false]
(do @
[_ (if multi-line?
(console.write " " console)
(console.write "> " console))
line (console.read-line console)]
(if (text/= "exit" line)
(console.write "Till next time..." console)
(case (do e.Monad<Error>
[[source' exprC] (syntax.read repl-module no-aliases (add-line line source))]
(macro.run' compiler
(lang.with-current-module repl-module
(do macro.Monad<Meta>
[[exprT exprV] (repl-translate source-dirs target-dir exprC)
## [var-id varT] (lang.with-type-env check.var)
## exprV (evalL.eval varT exprC)
## ?exprT (lang.with-type-env (check.read var-id))
]
(wrap [source' exprT exprV])))))
(#e.Success [compiler' [source' exprT exprV]])
(do @
[_ (console.write (format " Type: " (type.to-text exprT) "\n"
"Value: " (represent compiler' exprT exprV) "\n\n")
console)]
(recur compiler' source' false))
(#e.Error error)
(if (ex.match? syntax.End-Of-File error)
(recur compiler source true)
(exec (log! (REPL-Error error))
(recur compiler fresh-source false))))))
)))
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