(* Copyright (C) 2000, 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://cs.unibo.it/helm/.
 *)

(******************************************************************************)
(*                                                                            *)
(*                               PROJECT HELM                                 *)
(*                                                                            *)
(*                Claudio Sacerdoti Coen <sacerdot@cs.unibo.it>               *)
(*                                 24/01/2000                                 *)
(*                                                                            *)
(* This is the main (top level) module of a parser for cic objects from xml   *)
(* files to the internal representation. It uses the modules cicParser2       *)
(* (objects level) and cicParser3 (terms level)                               *)
(*                                                                            *)
(******************************************************************************)

exception Warnings;;

class warner =
  object 
    method warn w =
      prerr_endline ("WARNING: " ^ w) ;
      (raise Warnings : unit)
  end
;;

exception EmptyUri of string;;

(* given an uri u it returns the list of tokens of the base uri of u *)
(* e.g.: token_of_uri "cic:/a/b/c/d.xml" returns ["a" ; "b" ; "c"]   *)
let tokens_of_uri uri =
 let uri' = UriManager.string_of_uri uri in
 let rec chop_list =
  function
     [] -> raise (EmptyUri uri')
   | [fn] -> []
   | he::[fn] -> [he]
   | he::tl -> he::(chop_list tl)
 in
  let trimmed_uri = Str.replace_first (Str.regexp "cic:") "" uri' in
   let list_of_tokens = Str.split (Str.regexp "/") trimmed_uri in
    chop_list list_of_tokens
;;

(* given the filename of an xml file of a cic object it returns its internal *)
(* representation.                                                           *)
let annobj_of_xml filename filenamebody uri =
 let module Y = Pxp_yacc in
  try 
    let root, rootbody =
      (* sets the current base uri to resolve relative URIs *)
      CicParser3.current_sp := tokens_of_uri uri ;
      CicParser3.current_uri := uri ;
      let config = {Y.default_config with Y.warner = new warner} in
       let doc =
        Y.parse_document_entity config
         (Y.from_file ~alt:[PxpUrlResolver.url_resolver] filename)
         CicParser3.domspec in
(* CSC: Until PXP bug is resolved *)
PxpUrlResolver.url_resolver#close_all ;
       let docroot = doc#root in
        match filenamebody with
           None -> docroot,None
         | Some filename ->
            let docbody =
             Y.parse_document_entity config
              (Y.from_file ~alt:[PxpUrlResolver.url_resolver] filename)
              CicParser3.domspec
            in
(* CSC: Until PXP bug is resolved *)
PxpUrlResolver.url_resolver#close_all ;
             docroot,Some docbody#root
    in
     CicParser2.get_term root rootbody
  with
   e ->
     prerr_endline ("Filenames: " ^ filename ^
      (match filenamebody with None -> "" | Some s -> ", " ^ s)) ;
     prerr_endline ("Exception: " ^ Pxp_types.string_of_exn e) ;
     raise e
;;

let obj_of_xml filename filenamebody uri =
 Deannotate.deannotate_obj (annobj_of_xml filename filenamebody uri)
;;