(* Copyright (C) 2004, 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/
 *)

exception NoWellTypedInterpretation

module Environment =
 struct
  type t = Disambiguate_types.environment

  let empty = Disambiguate_types.Environment.empty

  let to_string env =
prerr_endline "TODO: implement and move away" ;
   Disambiguate_types.Environment.fold
    (fun i v s ->
      match i with
      | Disambiguate_types.Id id ->s ^ Printf.sprintf "alias %s %s\n" id (fst v)
      | _ -> "")
    env ""

  let of_string inputtext =
   let regexpr =
    let alfa = "[a-zA-Z_-]" in
    let digit = "[0-9]" in
    let ident = alfa ^ "\(" ^ alfa ^ "\|" ^ digit ^ "\)*" in
    let blanks = "\( \|\t\|\n\)+" in
    let nonblanks = "[^ \t\n]+" in
    let uri = "/\(" ^ ident ^ "/\)*" ^ nonblanks in (* not very strict check *)
     Str.regexp
      ("alias" ^ blanks ^ "\(" ^ ident ^ "\)" ^ blanks ^ "\(" ^ uri ^ "\)")
   in
    let rec aux n =
     try
      let n' = Str.search_forward regexpr inputtext n in
       let id = Disambiguate_types.Id (Str.matched_group 2 inputtext) in
       let uri = "cic:" ^ (Str.matched_group 5 inputtext) in
        let resolve_id = aux (n' + 1) in
         if Disambiguate_types.Environment.mem id resolve_id then
          resolve_id
         else
           let term = Disambiguate.term_of_uri uri in
           (Disambiguate_types.Environment.add id (uri, (fun _ _ _ -> term))
             resolve_id)
     with
      Not_found -> Disambiguate_types.Environment.empty
    in
     aux 0
 end
;;

module Make (C : Disambiguate_types.Callbacks) =
 struct
  let disambiguate_term mqi_handle context metasenv term_as_string environment =
   let module Disambiguate' = Disambiguate.Make (C) in
    let term = Parser.parse_term (Stream.of_string term_as_string) in
     Disambiguate'.disambiguate_term
      mqi_handle context metasenv term environment
 end
;;