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(.module:
  lux
  (lux (control [monad #+ do]
                ["ex" exception #+ exception:]
                ["p" parser])
       (data ["e" error]
             [text]
             text/format
             [number]
             (coll [list "list/" Functor<List>]
                   (dictionary ["dict" unordered #+ Dict])))
       [macro #+ with-gensyms]
       (macro [code]
              ["s" syntax #+ syntax:])
       [host])
  (luxc ["&" lang]
        (lang ["la" analysis]
              ["ls" synthesis]
              (host ["_" php #+ Expression Statement])))
  [///]
  (/// [".T" runtime]
       [".T" case]
       [".T" function]
       [".T" loop]))

## [Types]
(type: #export Translator
  (-> ls.Synthesis (Meta Expression)))

(type: #export Proc
  (-> Translator (List ls.Synthesis) (Meta Expression)))

(type: #export Bundle
  (Dict Text Proc))

(syntax: (Vector {size s.nat} elemT)
  (wrap (list (` [(~+ (list.repeat size elemT))]))))

(type: #export Nullary (-> (Vector +0 Expression) Expression))
(type: #export Unary   (-> (Vector +1 Expression) Expression))
(type: #export Binary  (-> (Vector +2 Expression) Expression))
(type: #export Trinary (-> (Vector +3 Expression) Expression))
(type: #export Variadic (-> (List Expression) Expression))

## [Utils]
(def: #export (install name unnamed)
  (-> Text (-> Text Proc)
      (-> Bundle Bundle))
  (dict.put name (unnamed name)))

(def: #export (prefix prefix bundle)
  (-> Text Bundle Bundle)
  (|> bundle
      dict.entries
      (list/map (function (_ [key val]) [(format prefix " " key) val]))
      (dict.from-list text.Hash<Text>)))

(def: (wrong-arity proc expected actual)
  (-> Text Nat Nat Text)
  (format "Wrong number of arguments for " (%t proc) "\n"
          "Expected: " (|> expected .int %i) "\n"
          "  Actual: " (|> actual .int %i)))

(syntax: (arity: {name s.local-identifier} {arity s.nat})
  (with-gensyms [g!_ g!proc g!name g!translate g!inputs]
    (do @
      [g!input+ (monad.seq @ (list.repeat arity (macro.gensym "input")))]
      (wrap (list (` (def: #export ((~ (code.local-identifier name)) (~ g!proc))
                       (-> (-> (..Vector (~ (code.nat arity)) Expression) Expression)
                           (-> Text ..Proc))
                       (function ((~ g!_) (~ g!name))
                         (function ((~ g!_) (~ g!translate) (~ g!inputs))
                           (case (~ g!inputs)
                             (^ (list (~+ g!input+)))
                             (do macro.Monad<Meta>
                               [(~+ (|> g!input+
                                        (list/map (function (_ g!input)
                                                    (list g!input (` ((~ g!translate) (~ g!input))))))
                                        list.concat))]
                               ((~' wrap) ((~ g!proc) [(~+ g!input+)])))

                             (~' _)
                             (macro.fail (wrong-arity (~ g!name) +1 (list.size (~ g!inputs))))))))))))))

(arity: nullary +0)
(arity: unary +1)
(arity: binary +2)
(arity: trinary +3)

(def: #export (variadic proc)
  (-> Variadic (-> Text Proc))
  (function (_ proc-name)
    (function (_ translate inputsS)
      (do macro.Monad<Meta>
        [inputsI (monad.map @ translate inputsS)]
        (wrap (proc inputsI))))))

## [Procedures]
## ## [[Lux]]
## (def: (lux//is [leftO rightO])
##   Binary
##   (_.is leftO rightO))

## (def: (lux//if [testO thenO elseO])
##   Trinary
##   (caseT.translate-if testO thenO elseO))

## (def: (lux//try riskyO)
##   Unary
##   (runtimeT.lux//try riskyO))

## (exception: #export (Wrong-Syntax {message Text})
##   message)

## (def: #export (wrong-syntax procedure args)
##   (-> Text (List ls.Synthesis) Text)
##   (format "Procedure: " procedure "\n"
##           "Arguments: " (%code (code.tuple args))))

## (def: lux//loop
##   (-> Text Proc)
##   (function (_ proc-name)
##     (function (_ translate inputsS)
##       (case (s.run inputsS ($_ p.seq s.nat (s.tuple (p.many s.any)) s.any))
##         (#e.Success [offset initsS+ bodyS])
##         (loopT.translate-loop translate offset initsS+ bodyS)

##         (#e.Error error)
##         (&.throw Wrong-Syntax (wrong-syntax proc-name inputsS)))
##       )))

## (def: lux//recur
##   (-> Text Proc)
##   (function (_ proc-name)
##     (function (_ translate inputsS)
##       (loopT.translate-recur translate inputsS))))

## (def: lux-procs
##   Bundle
##   (|> (dict.new text.Hash<Text>)
##       (install "is" (binary lux//is))
##       (install "try" (unary lux//try))
##       (install "if" (trinary lux//if))
##       (install "loop" lux//loop)
##       (install "recur" lux//recur)
##       ))

## ## [[Bits]]
## (template [<name> <op>]
##   [(def: (<name> [subjectO paramO])
##      Binary
##      (<op> paramO subjectO))]

##   [bit//and _.bit-and]
##   [bit//or  _.bit-or]
##   [bit//xor _.bit-xor]
##   )

## (def: (bit//left-shift [subjectO paramO])
##   Binary
##   (|> (_.bit-shl paramO subjectO)
##       runtimeT.bit//64))

## (template [<name> <op>]
##   [(def: (<name> [subjectO paramO])
##      Binary
##      (<op> paramO subjectO))]

##   [bit//arithmetic-right-shift _.bit-shr]
##   [bit//logical-right-shift    runtimeT.bit//logical-right-shift]
##   )

## (def: bit-procs
##   Bundle
##   (<| (prefix "bit")
##       (|> (dict.new text.Hash<Text>)
##           (install "and" (binary bit//and))
##           (install "or" (binary bit//or))
##           (install "xor" (binary bit//xor))
##           (install "left-shift" (binary bit//left-shift))
##           (install "logical-right-shift" (binary bit//logical-right-shift))
##           (install "arithmetic-right-shift" (binary bit//arithmetic-right-shift))
##           )))

## ## [[Numbers]]
## (host.import: java/lang/Double
##   (#static MIN_VALUE Double)
##   (#static MAX_VALUE Double))

## (template [<name> <const> <encode>]
##   [(def: (<name> _)
##      Nullary
##      (<encode> <const>))]

##   [frac//smallest          Double::MIN_VALUE            _.float]
##   [frac//min               (f/* -1.0 Double::MAX_VALUE) _.float]
##   [frac//max               Double::MAX_VALUE            _.float]
##   )

(template [<name> <op>]
  [(def: (<name> [subjectO paramO])
     Binary
     (|> subjectO
         (<op> paramO)))]

  [int//+        _.+]
  [int//-        _.-]
  [int//*        _.*]
  [int///        _./]
  [int//%        _.%]
  )

## (template [<name> <op>]
##   [(def: (<name> [subjectO paramO])
##      Binary
##      (<op> paramO subjectO))]

##   [frac//+ _.+]
##   [frac//- _.-]
##   [frac//* _.*]
##   [frac/// _./]
##   [frac//% _.%]
##   [frac//=   _.=]
##   [frac//<   _.<]

##   [text//=   _.=]
##   [text//<   _.<]
##   )

(template [<name> <cmp>]
  [(def: (<name> [subjectO paramO])
     Binary
     (<cmp> paramO subjectO))]

  [int//= _.=]
  [int//< _.<]
  )

(def: int-procs
  Bundle
  (<| (prefix "int")
      (|> (dict.new text.Hash<Text>)
          (install "+" (binary int//+))
          (install "-" (binary int//-))
          (install "*" (binary int//*))
          (install "/" (binary int///))
          (install "%" (binary int//%))
          (install "=" (binary int//=))
          (install "<" (binary int//<))
          (install "to-frac" (unary _.floatval/1)))))

## (def: frac-procs
##   Bundle
##   (<| (prefix "frac")
##       (|> (dict.new text.Hash<Text>)
##           (install "+" (binary frac//+))
##           (install "-" (binary frac//-))
##           (install "*" (binary frac//*))
##           (install "/" (binary frac///))
##           (install "%" (binary frac//%))
##           (install "=" (binary frac//=))
##           (install "<" (binary frac//<))
##           (install "smallest" (nullary frac//smallest))
##           (install "min" (nullary frac//min))
##           (install "max" (nullary frac//max))
##           (install "to-int" (unary (apply1 (_.global "int"))))
##           (install "encode" (unary (apply1 (_.global "repr"))))
##           (install "decode" (unary runtimeT.frac//decode)))))

## ## [[Text]]
## (def: (text//concat [subjectO paramO])
##   Binary
##   (|> subjectO (_.+ paramO)))

## (def: (text//char [subjectO paramO])
##   Binary
##   (runtimeT.text//char subjectO paramO))

## (def: (text//clip [subjectO paramO extraO])
##   Trinary
##   (runtimeT.text//clip subjectO paramO extraO))

## (def: (text//index [textO partO startO])
##   Trinary
##   (runtimeT.text//index textO partO startO))

## (def: text-procs
##   Bundle
##   (<| (prefix "text")
##       (|> (dict.new text.Hash<Text>)
##           (install "=" (binary text//=))
##           (install "<" (binary text//<))
##           (install "concat" (binary text//concat))
##           (install "index" (trinary text//index))
##           (install "size" (unary (apply1 (_.global "len"))))
##           (install "char" (binary text//char))
##           (install "clip" (trinary text//clip))
##           )))

## ## [[IO]]
## (def: io-procs
##   Bundle
##   (<| (prefix "io")
##       (|> (dict.new text.Hash<Text>)
##           (install "log" (unary runtimeT.io//log!))
##           (install "error" (unary runtimeT.io//throw!))
##           (install "exit" (unary runtimeT.io//exit!))
##           (install "current-time" (nullary (function (_ _)
##                                              (runtimeT.io//current-time! runtimeT.unit)))))))

## [Bundles]
(def: #export procedures
  Bundle
  (<| (prefix "lux")
      (|> (dict.new text.Hash<Text>)
          ## lux-procs
          ## (dict.merge bit-procs)
          (dict.merge int-procs)
          ## (dict.merge frac-procs)
          ## (dict.merge text-procs)
          ## (dict.merge io-procs)
          )))