(* Copyright (C) 2000-2002, 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>             *)
(*                Ferruccio Guidi        <fguidi@cs.unibo.it>               *)
(*                                 15/01/2003                               *)
(*                                                                          *)
(*                                                                          *)
(****************************************************************************)

exception IllFormedUri of string;;

let string_of_cic_textual_parser_uri uri =
 let module C = Cic in
 let module CTP = CicTextualParser0 in
  let uri' =
   match uri with
      CTP.ConUri uri -> UriManager.string_of_uri uri
    | CTP.VarUri uri -> UriManager.string_of_uri uri
    | CTP.IndTyUri (uri,tyno) ->
       UriManager.string_of_uri uri ^ "#1/" ^ string_of_int (tyno + 1)
    | CTP.IndConUri (uri,tyno,consno) ->
       UriManager.string_of_uri uri ^ "#1/" ^ string_of_int (tyno + 1) ^ "/" ^
        string_of_int consno
  in
   (* 4 = String.length "cic:" *)
   String.sub uri' 4 (String.length uri' - 4)
;;

let cic_textual_parser_uri_of_string uri' =
 try
  (* Constant *)
  if String.sub uri' (String.length uri' - 4) 4 = ".con" then
   CicTextualParser0.ConUri (UriManager.uri_of_string uri')
  else
   if String.sub uri' (String.length uri' - 4) 4 = ".var" then
    CicTextualParser0.VarUri (UriManager.uri_of_string uri')
   else
    (try
      (* Inductive Type *)
      let uri'',typeno = CicTextualLexer.indtyuri_of_uri uri' in
       CicTextualParser0.IndTyUri (uri'',typeno)
     with
        UriManager.IllFormedUri _
      | CicTextualParser0.LexerFailure _
      | Invalid_argument _ ->
         (* Constructor of an Inductive Type *)
         let uri'',typeno,consno =
          CicTextualLexer.indconuri_of_uri uri'
         in
          CicTextualParser0.IndConUri (uri'',typeno,consno)
    )
 with
    UriManager.IllFormedUri _
  | CicTextualParser0.LexerFailure _
  | Invalid_argument _ ->
     raise (IllFormedUri uri')
;;

(* CSC: quick fix: a function from [uri#xpointer(path)] to [uri#path] *)
let wrong_xpointer_format_from_wrong_xpointer_format' uri =
 try
  let index_sharp =  String.index uri '#' in
  let index_rest = index_sharp + 10 in
   let baseuri = String.sub uri 0 index_sharp in
   let rest =
    String.sub uri index_rest (String.length uri - index_rest - 1)
   in
    baseuri ^ "#" ^ rest
 with Not_found -> uri
;;

let term_of_cic_textual_parser_uri uri =
 let module C = Cic in
 let module CTP = CicTextualParser0 in
  match uri with
     CTP.ConUri uri -> C.Const (uri,[])
   | CTP.VarUri uri -> C.Var (uri,[])
   | CTP.IndTyUri (uri,tyno) -> C.MutInd (uri,tyno,[])
   | CTP.IndConUri (uri,tyno,consno) -> C.MutConstruct (uri,tyno,consno,[])
;;

(* conversion functions *****************************************************)

type uriref = UriManager.uri * (int list)

let string_of_uriref (uri, fi) =
   let module UM = UriManager in
   let str = UM.string_of_uri uri in
   let xp t = "#xpointer(1/" ^ string_of_int (t + 1) in
   match fi with
      | []          -> str 
      | [t]         -> str ^ xp t ^ ")" 
      | t :: c :: _ -> str ^ xp t ^ "/" ^ string_of_int c ^ ")"