(* Copyright (C) 2005, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * HELM 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://helm.cs.unibo.it/
 *)

open DisambiguateTypes

let parse_environment str =
 let stream = Stream.of_string str in
 let environment = ref Environment.empty in
 let multiple_environment = ref Environment.empty in
  try
    while true do
     let alias =
      match GrafiteParser.parse_statement stream with
         GrafiteAst.Executable (_, GrafiteAst.Command (_, GrafiteAst.Alias (_,alias)))
           -> alias
       | _ -> assert false in
     let key,value =
      (*CSC: Warning: this code should be factorized with the corresponding
             code in MatitaEngine *)
      match alias with
         GrafiteAst.Ident_alias (id,uri) ->
          Id id,
          (uri,(fun _ _ _-> CicUtil.term_of_uri (UriManager.uri_of_string uri)))
       | GrafiteAst.Symbol_alias (symb,instance,desc) ->
          Symbol (symb,instance),
          DisambiguateChoices.lookup_symbol_by_dsc symb desc
       | GrafiteAst.Number_alias (instance,desc) ->
          Num instance,
          DisambiguateChoices.lookup_num_by_dsc desc
     in
      environment := Environment.add key value !environment;
      multiple_environment := Environment.cons key value !multiple_environment;
    done;
    assert false
  with End_of_file ->
   !environment, !multiple_environment

let aliases_of_environment env =
  Environment.fold
    (fun domain_item (dsc,_) acc ->
      let s =
        match domain_item with
        | Id id -> GrafiteAst.Ident_alias (id, dsc)
        | Symbol (symb, i) -> GrafiteAst.Symbol_alias (symb, i, dsc)
        | Num i -> GrafiteAst.Number_alias (i, dsc)
      in
       s :: acc)
    env []

let commands_of_environment env =
  List.map
    (fun alias -> GrafiteAst.Alias (dummy_floc, alias))
    (aliases_of_environment env)

let pp_environment env =
  let aliases = aliases_of_environment env in
  let strings =
    List.map (fun alias -> GrafiteAstPp.pp_alias alias ^ ".") aliases
  in
  String.concat "\n" (List.sort compare strings)