(* 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/
 *)

class parserr () =
  object
    method parseTerm (stream: char Stream.t) =
      CicTextualParser2.parse_term stream

      (* TODO Zack: implements methods below *)
    method parseTactic (_: char Stream.t) : DisambiguateTypes.tactic =
      MatitaTypes.not_implemented "parserr.parseTactic"
    method parseTactical (_: char Stream.t) : DisambiguateTypes.tactical =
      MatitaTypes.not_implemented "parserr.parseTactical"
    method parseCommand (_: char Stream.t) : DisambiguateTypes.command =
      MatitaTypes.not_implemented "parserr.parseCommand"
    method parseScript (_: char Stream.t) : DisambiguateTypes.script =
      MatitaTypes.not_implemented "parserr.parseScript"
  end

class disambiguator
  ~parserr ~mqiconn ~(chooseUris: MatitaTypes.choose_uris_callback)
  ~(chooseInterp: MatitaTypes.choose_interp_callback) ()
  =
  let disambiguate_term =
    let module Callbacks =
      struct
        let interactive_user_uri_choice
          ~selection_mode ?ok ?(enable_button_for_non_vars = true) ~title ~msg
          ~id uris
        =
          chooseUris ~selection_mode ~title ~msg
            ~nonvars_button:enable_button_for_non_vars uris

        let interactive_interpretation_choice = chooseInterp
        let input_or_locate_uri ~(title:string) =
          (* TODO Zack: I try to avoid using this callback. I therefore assume
           * that the presence of an identifier that can't be resolved via
           * "locate" query is a syntax error *)
          MatitaTypes.not_implemented
            "MatitaDisambiguator: input_or_locate_uri callback"
      end
    in
    let module Disambiguator = Disambiguate.Make (Callbacks) in
    Disambiguator.disambiguate_term
  in
  object (self)
    val mutable parserr: parserr = parserr
    method parserr = parserr
    method setParserr p = parserr <- p

    val mutable _env = DisambiguateTypes.Environment.empty
    method env = _env
    method setEnv e = _env <- e

    method disambiguateTermAst ?(context = []) ?(metasenv = []) ?env termAst =
      let (save_state, env) =
        match env with
        | Some env -> (false, env)
        | None -> (true, _env)
      in
      match disambiguate_term mqiconn context metasenv termAst ~aliases:env with
      | [ (env, metasenv, term) as x ] ->
          if save_state then self#setEnv env;
          x
      | _ -> assert false

    method disambiguateTerm ?context ?metasenv ?env stream =
      self#disambiguateTermAst ?context ?metasenv ?env
        (parserr#parseTerm stream)
  end