open StdLabels

type pos = Lexing.position * Lexing.position
type ('a, 'b) variable = { pos : 'a; name : string; index : 'b option }

module Expression = Default.Expression

module Instruction = struct
  type repr = unit
  type expression = Expression.repr
  type variable = Expression.variable

  (** Call for an instruction like [GT] or [*CLR] *)
  let call : pos -> string -> expression list -> repr = fun _ _ _ -> ()

  (** Label for a loop *)
  let location : pos -> string -> repr = fun _ _ -> ()

  (** Comment *)
  let comment : pos -> repr = fun _ -> ()

  (** Raw expression *)
  let expression : expression -> repr = fun _ -> ()

  type clause = pos * expression * repr list

  let if_ : pos -> clause -> elifs:clause list -> else_:repr list -> repr =
   fun _ _ ~elifs ~else_ ->
    ignore elifs;
    ignore else_;
    ()

  let act : pos -> label:expression -> repr list -> repr =
   fun _ ~label _ ->
    ignore label;
    ()

  let assign : pos -> variable -> T.assignation_operator -> expression -> repr =
   fun _ _ _ _ -> ()
end

module Location = struct
  type repr = Instruction.repr
  type instruction = Instruction.repr

  let location : pos -> instruction list -> repr =
   fun _pos instructions ->
    List.fold_left instructions ~init:() ~f:(fun () instruction -> instruction)
end