(******************************************************************************)
(*                                                                            *)
(*                               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 =
      print_endline ("WARNING: " ^ w) ;
      (raise Warnings : unit)
  end
;;

exception EmptyUri;;

(* 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
   | 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. process_annotations is true if the annotations do really  *)
(* matter                                                                    *)
let term_of_xml filename uri process_annotations =
 let module Y = Pxp_yacc in
  try 
    let d =
      (* sets the current base uri to resolve relative URIs *)
      CicParser3.current_sp := tokens_of_uri uri ;
      CicParser3.current_uri := uri ;
      CicParser3.process_annotations := process_annotations ;
      CicParser3.ids_to_targets :=
       if process_annotations then Some (Hashtbl.create 500) else None ;
      let config = {Y.default_config with Y.warner = new warner} in
      Y.parse_document_entity config
(*PXP       (Y.ExtID (Pxp_types.System filename,
         new Pxp_reader.resolve_as_file ~url_of_id ()))
*)     (PxpUriResolver.from_file filename)
       CicParser3.domspec
    in
     let ids_to_targets = !CicParser3.ids_to_targets in
      let res = (CicParser2.get_term d#root, ids_to_targets) in
       CicParser3.ids_to_targets := None ; (* let's help the GC *)
       res
  with
   e ->
     print_endline (Pxp_types.string_of_exn e) ;
     raise e
;;