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(.module:
lux
(lux (control ["ex" exception #+ exception:])
(data [bit]
[maybe]
["e" error #+ Error]
text/format
(coll [array]))
[host])
(luxc [lang]
(lang (host [lua #+ Lua Expression Statement])))
[//])
(host.import java/lang/Object
(toString [] String)
(getClass [] (Class Object)))
(host.import java/lang/Long
(intValue [] Integer))
(host.import net/sandius/rembulan/ByteString
(decode [] String))
(host.import net/sandius/rembulan/Table
(rawget #as get-idx [long] #? Object)
(rawget #as get-key [Object] #? Object)
(rawlen [] long))
(host.import net/sandius/rembulan/impl/DefaultTable)
(def: (variant lux-object host-object)
(-> (-> Object (Error Top)) DefaultTable (Maybe Top))
(case [(Table::get-key [//.variant-tag-field] host-object)
(Table::get-key [//.variant-flag-field] host-object)
(Table::get-key [//.variant-value-field] host-object)]
(^multi [(#.Some tag) ?flag (#.Some value)]
[(lux-object value)
(#.Some value)])
(#.Some [(Long::intValue [] (:! Long tag))
(: Top (case ?flag (#.Some _) "" #.None (host.null)))
value])
_
#.None))
(def: (array lux-object host-object)
(-> (-> Object (Error Top)) DefaultTable (Maybe (Array Object)))
(let [init-num-keys (:! Nat (Table::rawlen [] host-object))]
(loop [num-keys init-num-keys
idx +0
output (: (Array Object)
(array.new init-num-keys))]
(if (n/< num-keys idx)
(case (Table::get-idx (:! Long (n/inc idx)) host-object)
(#.Some member)
(case (lux-object member)
(#e.Success parsed-member)
(recur num-keys (n/inc idx) (array.write idx (:! Object parsed-member) output))
(#e.Error error)
#.None)
#.None
(recur num-keys (n/inc idx) output))
(#.Some output)))))
(exception: #export Unknown-Kind-Of-Host-Object)
(exception: #export Null-Has-No-Lux-Representation)
(def: (lux-object host-object)
(-> Object (Error Top))
(`` (cond (host.null? host-object)
(ex.throw Null-Has-No-Lux-Representation "")
(or (host.instance? java/lang/Boolean host-object)
(host.instance? java/lang/Long host-object)
(host.instance? java/lang/Double host-object)
(host.instance? java/lang/String host-object))
(ex.return host-object)
(host.instance? ByteString host-object)
(ex.return (ByteString::decode [] (:! ByteString host-object)))
(host.instance? DefaultTable host-object)
(let [host-object (:! DefaultTable host-object)]
(case (variant lux-object host-object)
(#.Some value)
(ex.return value)
#.None
(case (array lux-object host-object)
(#.Some value)
(ex.return value)
#.None
(ex.throw Unknown-Kind-Of-Host-Object (format "SECOND " (Object::toString [] (:! Object host-object)))))))
## else
(ex.throw Unknown-Kind-Of-Host-Object (format "FIRST " (Object::toString [] (:! Object host-object))))
)))
(exception: #export Cannot-Evaluate)
(def: #export (eval code)
(-> Expression (Meta Top))
(function [compiler]
(let [interpreter (|> compiler (get@ #.host) (:! //.Host) (get@ #//.interpreter))]
(case (interpreter (format "return " code ";"))
(#e.Error error)
((lang.throw Cannot-Evaluate error) compiler)
(#e.Success output)
(case (lux-object (|> output
(:! (Array Object))
(array.read +0)
maybe.assume))
(#e.Success parsed-output)
(#e.Success [compiler parsed-output])
(#e.Error error)
((lang.throw Cannot-Evaluate error) compiler))))))
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