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(*
Copyright © 2011 MLstate

This file is part of OPA.

OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.

OPA is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
more details.

You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <http://www.gnu.org/licenses/>.
*)
(** Just define the json type in Ocaml *)

(** Json type in OCaml *)
type json =
  | Int of int
  | Float of float
  | String of string
  | Bool of bool
  | Void
  | Array of json list
  | Record of (string * json) list

(** {6 Passing Json to OPA} *)

(**
In opa, you can use magic_unserialize to unserialize
this structure, and build opa values.

<!> For optimization purpose, for passing such values to opa,
the fields in [Record] should be in decreasing order.

This function checks that property
*)
let assert_for_opa_magic_unserialize json =
  let check_record list =
    let rec aux last = function
      | [] -> ()
      | (hd, _) :: tl ->
          if not (String.compare last hd > 0)
          then assert false
          else aux hd tl
    in
    match list with
    | [] | [_] -> ()
    | (hd, _) :: tl -> aux hd tl
  in
  let rec aux = function
    | Array json -> List.iter aux json
    | Record fields ->
        check_record fields ;
        List.iter (fun (_, json) -> aux json) fields
    | _ -> ()
  in
  aux json
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