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(.module:
lux
(lux (control [monad #+ do]
["ex" exception #+ exception:]
["p" parser]
pipe)
(data [error #+ Error]
text/format
(format [xml #+ XML]
[json #+ JSON])
(collection [list]))
(time [instant #+ Instant]
[duration #+ Duration]
[date #+ Date])
[function]
[macro]
(macro [code]
[poly #+ Poly])
(lang [type])))
(exception: #export (cannot-represent-value {type Type})
(ex.report ["Type" (%type type)]))
(type: Representation (-> Any Text))
(def: primitive-representation
(Poly Representation)
(`` ($_ p.either
(do p.Monad<Parser>
[_ (poly.this Any)]
(wrap (function.constant "[]")))
(~~ (do-template [<type> <formatter>]
[(do p.Monad<Parser>
[_ (poly.like <type>)]
(wrap (|>> (:coerce <type>) <formatter>)))]
[Bool %b]
[Nat %n]
[Int %i]
[Rev %r]
[Frac %f]
[Text %t])))))
(def: (special-representation representation)
(-> (Poly Representation) (Poly Representation))
(`` ($_ p.either
(~~ (do-template [<type> <formatter>]
[(do p.Monad<Parser>
[_ (poly.like <type>)]
(wrap (|>> (:coerce <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 (|>> (:coerce (List Any)) (%list elemR))))
(do p.Monad<Parser>
[[_ elemT] (poly.apply (p.seq (poly.this Maybe) poly.any))
elemR (poly.local (list elemT) representation)]
(wrap (|>> (:coerce (Maybe Any))
(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] (:coerce [Any Any] 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 (dec num-tags))
casesR+)
variantV variantV]
(case cases-left
#.Nil
""
(#.Cons [tag-name tag-idx repr] #.Nil)
(let [[_tag _last? _value] (:coerce [Nat Text Any] 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] (:coerce [Nat Text Any] variantV)]
(if (n/= tag-idx _tag)
(format "(" (%code (code.tag tag-name)) " " (repr _value) ")")
(recur tail variantV)))))))))
(def: (tagged-representation compiler representation)
(-> Lux (Poly Representation) (Poly Representation))
(do p.Monad<Parser>
[[name anonymous] poly.named]
(case (macro.run compiler (macro.tags-of name))
(#error.Success ?tags)
(case ?tags
(#.Some tags)
(poly.local (list anonymous)
(p.either (record-representation tags representation)
(variant-representation tags representation)))
#.None
representation)
(#error.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] (:coerce [Any Any] tupleV)]
(format (headR leftV) " " (recur tailR rightV)))))]
(format "[" tuple-body "]"))))))
(def: (representation compiler)
(-> Lux (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: #export (represent compiler type value)
(-> Lux Type Any Text)
(case (poly.run type (representation compiler))
(#error.Success representation)
(ex.report ["Type" (%type type)]
["Value" (representation value)])
(#error.Error error)
(ex.construct cannot-represent-value [type])))
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