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(.module:
  [library
   [lux (#- public private)
    [abstract
     [equivalence (#+ Equivalence)]
     ["." monad (#+ do)]]
    [control
     ["." state]
     ["." try (#+ Try)]]
    [data
     ["." product]
     [format
      [".F" binary (#+ Writer) ("#\." monoid)]]
     [collection
      ["." row (#+ Row)]]]]]
  ["." // #_
   ["#." modifier (#+ Modifier modifiers:)]
   ["#." version (#+ Version Minor Major)]
   ["#." magic (#+ Magic)]
   ["#." index (#+ Index)]
   ["#." attribute (#+ Attribute)]
   ["#." field (#+ Field)]
   ["#." method (#+ Method)]
   [encoding
    ["#." unsigned]
    ["#." name (#+ Internal)]]
   ["#." constant (#+ Constant)
    ["#/." pool (#+ Pool Resource)]]])

(type: .public #rec Class
  {#magic Magic
   #minor_version Minor
   #major_version Major
   #constant_pool Pool
   #modifier (Modifier Class)
   #this (Index //constant.Class)
   #super (Index //constant.Class)
   #interfaces (Row (Index //constant.Class))
   #fields (Row Field)
   #methods (Row Method)
   #attributes (Row Attribute)})

(modifiers: Class
  ["0001" public]
  ["0010" final]
  ["0020" super]
  ["0200" interface]
  ["0400" abstract]
  ["1000" synthetic]
  ["2000" annotation]
  ["4000" enum]
  )

(def: .public equivalence
  (Equivalence Class)
  ($_ product.equivalence
      //unsigned.equivalence
      //unsigned.equivalence
      //unsigned.equivalence
      //constant/pool.equivalence
      //modifier.equivalence
      //index.equivalence
      //index.equivalence
      (row.equivalence //index.equivalence)
      (row.equivalence //field.equivalence)
      (row.equivalence //method.equivalence)
      (row.equivalence //attribute.equivalence)))

(def: (install_classes this super interfaces)
  (-> Internal Internal (List Internal)
      (Resource [(Index //constant.Class) (Index //constant.Class) (Row (Index //constant.Class))]))
  (do {! //constant/pool.monad}
    [@this (//constant/pool.class this)
     @super (//constant/pool.class super)
     @interfaces (: (Resource (Row (Index //constant.Class)))
                    (monad.fold ! (function (_ interface @interfaces)
                                    (do !
                                      [@interface (//constant/pool.class interface)]
                                      (in (row.suffix @interface @interfaces))))
                                row.empty
                                interfaces))]
    (in [@this @super @interfaces])))

(def: .public (class version modifier
                     this super interfaces
                     fields methods attributes)
  (-> Major (Modifier Class)
      Internal Internal (List Internal)
      (List (Resource Field))
      (List (Resource Method))
      (Row Attribute)
      (Try Class))
  (do try.monad
    [[pool [@this @super @interfaces] =fields =methods]
     (<| (state.result' //constant/pool.empty)
         (do //constant/pool.monad
           [classes (install_classes this super interfaces)
            =fields (monad.all //constant/pool.monad fields)
            =methods (monad.all //constant/pool.monad methods)]
           (in [classes =fields =methods])))]
    (in {#magic //magic.code
         #minor_version //version.default_minor
         #major_version version
         #constant_pool pool
         #modifier modifier
         #this @this
         #super @super
         #interfaces @interfaces
         #fields (row.of_list =fields)
         #methods (row.of_list =methods)
         #attributes attributes})))

(def: .public (writer class)
  (Writer Class)
  (`` ($_ binaryF\compose
          (~~ (template [<writer> <slot>]
                [(<writer> (value@ <slot> class))]

                [//magic.writer #magic]
                [//version.writer #minor_version]
                [//version.writer #major_version]
                [//constant/pool.writer #constant_pool]
                [//modifier.writer #modifier]
                [//index.writer #this]
                [//index.writer #super]))
          (~~ (template [<writer> <slot>]
                [((binaryF.row/16 <writer>) (value@ <slot> class))]

                [//index.writer #interfaces]
                [//field.writer #fields]
                [//method.writer #methods]
                [//attribute.writer #attributes]
                ))
          )))