(* 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/
 *)

open Printf

(* cut and past from CicAst.loc_of_floc *)
let loc_of_floc = function
  | { Lexing.pos_cnum = loc_begin }, { Lexing.pos_cnum = loc_end } ->
      (loc_begin, loc_end)

let _ =
  let module P = CicNotationPt in
  let level = ref ~-1 in
  let arg_spec = [ "-level", Arg.Set_int level, "set the notation level" ] in
  let usage = "test_parser -level { 1 | 2 | 3 }" in
  Arg.parse arg_spec (fun _ -> raise (Arg.Bad usage)) usage;
  if !level = 2 then begin
    let id =
      CicNotationParser.extend ~precedence:50 ~associativity:Gramext.LeftA
        (P.Layout (P.Box (P.H,
          [ P.Literal (`Symbol "+");
            P.Magic (P.Opt (P.Layout (P.Box (P.H,
              [ P.Variable (P.TermVar "ugo");
                P.Literal (`Symbol "+");
                P.Variable (P.TermVar "pino")
              ]))));
          ]
(*           [ P.Variable (P.TermVar "a");
            P.Literal (`Symbol "+");
            P.Variable (P.TermVar "b");
          ] *)
            )))
        (fun env _ ->
          begin
          prerr_endline "reducing rule" ;
          prerr_endline (sprintf "env = [ %s ]" (CicNotationParser.pp_env env));
(*           match env with
          [(_, (_, P.OptValue v))] ->
              begin
                match v with
                | Some x ->
                    printf "Ugo c'e'? %s\n" (CicNotationParser.pp_value x);
                    flush stdout
                | None  -> prerr_endline "nooooo"
              end
           | _ -> assert false *)
          end ;
          P.Sort `Prop)
    in
    CicNotationParser.print_l2_pattern ()
  end;
  let parse_fun s =
    match !level with
    | 1 -> ignore (CicNotationParser.parse_syntax_pattern s)
    | 2 ->
        let ast = CicNotationParser.parse_ast_pattern s in
        if ast = P.Sort `Prop then
          prerr_endline "eureka (ma sono cazzi)"
        else
          prerr_endline ":-("
    | 3 -> ignore (CicNotationParser.parse_interpretation s)
    | _ -> Arg.usage arg_spec usage; exit 1
  in
  let ic = stdin in
  try
    printf "Parsing notation level %d\n" !level; flush stdout;
    while true do
      let line = input_line ic in
      let istream = Stream.of_string line in
      try
        parse_fun istream;
        print_endline ">"
      with CicNotationParser.Parse_error (floc, msg) ->
        let (x, y) = loc_of_floc floc in
        let before = String.sub line 0 x in
        let error = String.sub line x (y - x) in
        let after = String.sub line y (String.length line - y) in
        eprintf "%s%s%s\n" before error after;
        prerr_endline (sprintf "at character %d-%d: %s" x y msg)
    done
  with End_of_file ->
    close_in ic