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(.using
 [library
  [lux {"-" Type Primitive}
   ["[0]" ffi {"+" import:}]
   [abstract
    ["[0]" monad {"+" do}]]
   [control
    ["[0]" exception {"+" exception:}]]
   [data
    [text
     ["%" format {"+" format}]]
    [collection
     ["[0]" list]]]
   [math
    [number
     ["n" nat]
     ["i" int]]]
   [target
    [jvm
     ["[0]" type {"+" Type}
      ["[0]" category {"+" Void Value Return Primitive Object Class Array Var Parameter Method}]
      ["[0]" descriptor {"+" Descriptor}]
      ["[0]" signature {"+" Signature}]]]]
   [tool
    [compiler
     ["[0]" phase]
     [meta
      [archive {"+" Archive}]]
     [language
      [lux
       [synthesis {"+" Synthesis}]]]]]]]
 [luxc
  [lang
   [host
    [jvm {"+" Inst Operation Phase Generator}
     ["_" inst]]]]]
 ["[0]" //
  ["[1][0]" runtime]])

(exception: .public (not_a_tuple [size Nat])
  (exception.report
   "Expected size" ">= 2"
   "Actual size" (%.nat size)))

(def: .public (tuple generate archive members)
  (Generator (List Synthesis))
  (do [@ phase.monad]
    [.let [size (list.size members)]
     _ (phase.assertion ..not_a_tuple size
                        (n.>= 2 size))
     membersI (|> members
                  list.enumeration
                  (monad.each @ (function (_ [idx member])
                                  (do @
                                    [memberI (generate archive member)]
                                    (in (|>> _.DUP
                                             (_.int (.int idx))
                                             memberI
                                             _.AASTORE)))))
                  (# @ each _.fuse))]
    (in (|>> (_.int (.int size))
             (_.array //runtime.$Value)
             membersI))))

(import: java/lang/Byte
  "[1]::[0]"
  ("static" MAX_VALUE byte)
  ("static" MIN_VALUE byte))

(import: java/lang/Short
  "[1]::[0]"
  ("static" MAX_VALUE short)
  ("static" MIN_VALUE short))

(def: .public (tagI lefts right?)
  (-> Nat Bit Inst)
  (case lefts
    0 _.ICONST_0
    1 _.ICONST_1
    2 _.ICONST_2
    3 _.ICONST_3
    4 _.ICONST_4
    5 _.ICONST_5
    tag (let [tag (.int tag)]
          (cond (and (i.>= (java/lang/Byte::MIN_VALUE) tag)
                     (i.<= (java/lang/Byte::MAX_VALUE) tag))
                (_.BIPUSH tag)
                
                (and (i.>= (java/lang/Short::MIN_VALUE) tag)
                     (i.<= (java/lang/Short::MAX_VALUE) tag))
                (_.SIPUSH tag)

                ... else
                (_.int tag)))))

(def: .public leftI _.NULL)
(def: .public rightI (_.string ""))

(def: .public (flagI right?)
  (-> Bit Inst)
  (if right?
    ..rightI
    ..leftI))

(def: .public (variant generate archive [lefts right? member])
  (Generator [Nat Bit Synthesis])
  (do phase.monad
    [memberI (generate archive member)
     .let [tagI (..tagI lefts right?)]]
    (in (|>> tagI
             (flagI right?)
             memberI
             (_.INVOKESTATIC //.$Runtime
                             "variant_make"
                             (type.method [(list)
                                           (list //runtime.$Lefts //runtime.$Right? //runtime.$Value)
                                           //.$Variant
                                           (list)]))))))