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(.module: {#.doc "Commons syntax readers."}
  lux
  (lux (control monad
                ["p" parser "p/" Monad<Parser>])
       (data (coll [list])
             [ident "ident/" Eq<Ident>]
             [product]
             [maybe])
       [macro]
       (macro ["s" syntax #+ syntax: Syntax]))
  [//])

## Exports
(def: #export export
  (Syntax Bool)
  (p.either (p.after (s.this (' #export)) (p/wrap true))
            (p/wrap false)))

## Declarations
(def: #export declaration
  {#.doc (doc "A reader for declaration syntax."
              "Such as:"
              quux
              (foo bar baz))}
  (Syntax //.Declaration)
  (p.either (p.seq s.local-symbol
                   (p/wrap (list)))
            (s.form (p.seq s.local-symbol
                           (p.many s.local-symbol)))))

## Annotations
(def: #export annotations
  {#.doc "Reader for the common annotations syntax used by def: statements."}
  (Syntax //.Annotations)
  (s.record (p.some (p.seq s.tag s.any))))

## Definitions
(def: check^
  (Syntax [(Maybe Code) Code])
  (p.either (s.form (do p.Monad<Parser>
                      [_ (s.this (' "lux check"))
                       type s.any
                       value s.any]
                      (wrap [(#.Some type) value])))
            (p.seq (p/wrap #.None)
                   s.any)))

(def: _definition-anns-tag^
  (Syntax Ident)
  (s.tuple (p.seq s.text s.text)))

(def: (_definition-anns^ _)
  (-> Top (Syntax //.Annotations))
  (p.alt (s.this (' #.Nil))
         (s.form (do p.Monad<Parser>
                   [_ (s.this (' #.Cons))
                    [head tail] (p.seq (s.tuple (p.seq _definition-anns-tag^ s.any))
                                       (_definition-anns^ []))]
                   (wrap [head tail])))
         ))

(def: (flat-list^ _)
  (-> Top (Syntax (List Code)))
  (p.either (do p.Monad<Parser>
              [_ (s.this (' #.Nil))]
              (wrap (list)))
            (s.form (do p.Monad<Parser>
                      [_ (s.this (' #.Cons))
                       [head tail] (s.tuple (p.seq s.any s.any))
                       tail (s.local (list tail) (flat-list^ []))]
                      (wrap (#.Cons head tail))))))

(do-template [<name> <type> <tag> <then>]
  [(def: <name>
     (Syntax <type>)
     (<| s.tuple
         (p.after s.any)
         s.form
         (do p.Monad<Parser>
           [_ (s.this (' <tag>))]
           <then>)))]

  [tuple-meta^ (List Code) #.Tuple (flat-list^ [])]
  [text-meta^  Text        #.Text  s.text]
  )

(def: (find-definition-args meta-data)
  (-> (List [Ident Code]) (List Text))
  (<| (maybe.default (list))
      (case (list.find (|>> product.left (ident/= ["lux" "func-args"])) meta-data)
        (^multi (#.Some [_ value])
                [(p.run (list value) tuple-meta^)
                 (#.Right [_ args])]
                [(p.run args (p.some text-meta^))
                 (#.Right [_ args])])
        (#.Some args)

        _
        #.None)
      ))

(def: #export (definition compiler)
  {#.doc "A reader that first macro-expands and then analyses the input Code, to ensure it's a definition."}
  (-> Compiler (Syntax //.Definition))
  (do p.Monad<Parser>
    [definition-raw s.any
     me-definition-raw (s.on compiler
                             (macro.expand-all definition-raw))]
    (s.local me-definition-raw
             (s.form (do @
                       [_ (s.this (' "lux def"))
                        definition-name s.local-symbol
                        [?definition-type definition-value] check^
                        definition-anns s.any
                        definition-anns (s.local (list definition-anns)
                                                 (_definition-anns^ []))
                        #let [definition-args (find-definition-args definition-anns)]]
                       (wrap {#//.definition-name definition-name
                              #//.definition-type ?definition-type
                              #//.definition-anns definition-anns
                              #//.definition-value definition-value
                              #//.definition-args definition-args}))))))

(def: #export (typed-definition compiler)
  {#.doc "A reader for definitions that ensures the input syntax is typed."}
  (-> Compiler (Syntax //.Definition))
  (do p.Monad<Parser>
    [_definition (definition compiler)
     _ (case (get@ #//.definition-type _definition)
         (#.Some _)
         (wrap [])

         #.None
         (p.fail "Typed definition must have a type!")
         )]
    (wrap _definition)))

(def: #export typed-input
  {#.doc "Reader for the common typed-argument syntax used by many macros."}
  (Syntax //.Typed-Input)
  (s.record (p.seq s.any s.any)))

(def: #export type-variables
  {#.doc "Reader for the common type var/param used by many macros."}
  (Syntax (List Text))
  (s.tuple (p.some s.local-symbol)))