(* Copyright (C) 2020 Hongbo Zhang, Authors of ReScript
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * In addition to the permissions granted to you by the LGPL, you may combine
 * or link a "work that uses the Library" with a publicly distributed version
 * of this file to produce a combined library or application, then distribute
 * that combined work under the terms of your choosing, with no requirement
 * to comply with the obligations normally placed on you by section 4 of the
 * LGPL version 3 (or the corresponding section of a later version of the LGPL
 * should you choose to use a later version).
 *
 * This program 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *)

type action_table = (Parsetree.expression option -> unit) Map_string.t

let structural_config_table : action_table ref =
  ref
    (Map_string.singleton "no_export" (fun x ->
         Js_config.no_export :=
           match x with
           | Some e -> Ast_payload.assert_bool_lit e
           | None -> true))

let add_structure k v =
  structural_config_table := Map_string.add !structural_config_table k v

let signature_config_table : action_table ref = ref Map_string.empty

let add_signature k v =
  signature_config_table := Map_string.add !signature_config_table k v

let process_directives str =
  Js_config.directives := [];
  (* Reset: multiple calls possible e.g. with bsc from the command-line *)
  str
  |> List.iter (fun (item : Parsetree.structure_item) ->
         match item.pstr_desc with
         | Pstr_attribute ({txt = "directive"}, payload) -> (
           match Ast_payload.is_single_string payload with
           | Some (d, _) -> Js_config.directives := !Js_config.directives @ [d]
           | None -> Bs_syntaxerr.err item.pstr_loc Expect_string_literal)
         | _ -> ())

let rec iter_on_config_str (x : Parsetree.structure) =
  match x with
  | [] -> ()
  | {pstr_desc = Pstr_attribute (({txt = "config"; loc}, payload) as attr)} :: _
    ->
    Used_attributes.mark_used_attribute attr;
    Ext_list.iter
      (Ast_payload.ident_or_record_as_config loc payload)
      (Ast_payload.table_dispatch !structural_config_table)
  | {pstr_desc = Pstr_attribute _} :: rest -> iter_on_config_str rest
  | _ :: _ -> ()

let process_str str =
  iter_on_config_str str;
  process_directives str

let rec iter_on_config_sig (x : Parsetree.signature) =
  match x with
  | [] -> ()
  | {psig_desc = Psig_attribute (({txt = "config"; loc}, payload) as attr)} :: _
    ->
    Used_attributes.mark_used_attribute attr;
    Ext_list.iter
      (Ast_payload.ident_or_record_as_config loc payload)
      (Ast_payload.table_dispatch !signature_config_table)
  | {psig_desc = Psig_attribute _} :: rest -> iter_on_config_sig rest
  | _ :: _ -> ()

let process_sig s = iter_on_config_sig s
