(* 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/
 *)

(* $Id$ *)

module G = GrafiteAst

let debug = false ;;
let debug_print = if debug then prerr_endline else ignore ;;

let eval_macro_screenshot (status : GrafiteTypes.status) name =
  assert false (* MATITA 1.0
  let _,_,metasenv,subst,_ = status#obj in
  let sequent = List.hd metasenv in
  let mathml = 
    ApplyTransformation.nmml_of_cic_sequent 
      status metasenv subst sequent 
  in
  let domImpl = Gdome.domImplementation () in
  ignore(domImpl#saveDocumentToFile 
    ~name:(name^".xml") ~doc:mathml ());
  ignore(Sys.command ("mathmlsvg --verbose=1 --font-size=20 --cut-filename=no " ^ 
    Filename.quote (name^".xml")));
  ignore(Sys.command ("convert " ^ 
    Filename.quote (name^".svg") ^ " " ^ 
    Filename.quote (name^".png")));
  HLog.debug ("generated " ^ name ^ ".png");
  status, `New []
  *)
;;

let eval_ast ~include_paths ?do_heavy_checks status (text,prefix_len,ast) =
 let baseuri = status#baseuri in
 let new_aliases,new_status =
  GrafiteDisambiguate.eval_with_new_aliases status
   (fun status ->
     GrafiteEngine.eval_ast ~include_paths ?do_heavy_checks status
      (text,prefix_len,ast)) in
 let _,intermediate_states = 
  List.fold_left
   (fun (status,acc) (k,value) -> 
     let v = GrafiteAst.description_of_alias value in
     let b =
      try
       let NReference.Ref (uri,_) = NReference.reference_of_string v in
        NUri.baseuri_of_uri uri = baseuri
      with
       NReference.IllFormedReference _ ->
        false (* v is a description, not a URI *)
     in
      if b then 
       status,acc
      else
       let status =
        GrafiteDisambiguate.set_proof_aliases status ~implicit_aliases:false
         GrafiteAst.WithPreferences [k,value]
       in
        status, (status ,Some (k,value))::acc
   ) (status,[]) new_aliases (* WARNING: this must be the old status! *)
 in
  (new_status,None)::intermediate_states
;;

exception TryingToAdd of string
exception EnrichedWithStatus of exn * GrafiteTypes.status

let eval_from_stream ~first_statement_only ~include_paths 
 ?do_heavy_checks ?(enforce_no_new_aliases=true)
 ?(watch_statuses=fun _ -> ()) status str cb 
=
 let matita_debug = Helm_registry.get_bool "matita.debug" in
 let rec loop status statuses =
  let loop =
   if first_statement_only then fun _ statuses -> statuses
   else loop
  in
  let stop,g,s = 
   try
     let cont =
       try Some (GrafiteParser.parse_statement status str)
       with End_of_file -> None in
     match cont with
     | None -> true, status, statuses
     | Some ast ->
       (match ast with
           GrafiteParser.LNone _ ->
            watch_statuses status ;
            false, status, ((status,None)::statuses)
         | GrafiteParser.LSome ast ->
            cb status ast;
            let new_statuses =
              eval_ast ~include_paths ?do_heavy_checks status ("",0,ast) in
            if enforce_no_new_aliases then
             List.iter 
              (fun (_,alias) ->
                match alias with
                  None -> ()
                | Some (k,value) ->
                   let newtxt = GrafiteAstPp.pp_alias value in
                    raise (TryingToAdd newtxt)) new_statuses;
            let status =
             match new_statuses with
                [] -> assert false
              | (s,_)::_ -> s
            in
             watch_statuses status ;
             false, status, (new_statuses @ statuses))
   with exn when not matita_debug ->
     raise (EnrichedWithStatus (exn, status))
  in
  if stop then s else loop g s
 in
  loop status []
;;