(*
 *  Copyright (c) 2005 by Laboratoire Spécification et Vérification (LSV),
 *  UMR 8643 CNRS & ENS Cachan.
 *  Written by Jean Goubault-Larrecq.  Not derived from licensed software.
 *
 *  Permission is granted to anyone to use this software for any
 *  purpose on any computer system, and to redistribute it freely,
 *  subject to the following restrictions:
 *
 *  1. Neither the author nor its employer is responsible for the consequences
 *     of use of this software, no matter how awful, even if they arise
 *     from defects in it.
 *
 *  2. The origin of this software must not be misrepresented, either
 *     by explicit claim or by omission.
 *
 *  3. Altered versions must be plainly marked as such, and must not
 *     be misrepresented as being the original software.
 *
 *  4. This software is restricted to non-commercial use only.  Commercial
 *     use is subject to a specific license, obtainable from LSV.
 * 
 *)

type locator = string * int * int * int * int
    (* nom du fichier, ou "";
     premiere ligne,
     premiere colonne,
     derniere ligne,
     derniere colonne.
     *)

let sup_locator (file, line1, col1, _, _) (file', _, _, line2, col2) =
  (if file="" then file' else file),
  line1, col1, line2, col2

type hlocator = string * int * int

let loc_start (file, line1, col1, _, _) = (file, line1, col1)
let loc_end (file, _, _, line2, col2) = (file, line2, col2)

let prerr_locator (file, line1, col1, line2, col2) =
  if file<>"" then begin
    prerr_string file;
    prerr_string ", line";
    if line1<>line2 then prerr_string "s";
    prerr_string " ";
    prerr_int line1;
    if col1<>0 then begin
      prerr_string "("; prerr_int col1; prerr_string ")"
    end;
    if line1<>line2 || col1<>col2 then begin
      prerr_string "-";
      prerr_int line2;
      if col2<>0 then begin
        prerr_string "(";
        prerr_int col2;
        prerr_string ")"
      end
    end
  end

let prerr_loc loc =
  match loc with
    | Some l ->
        prerr_locator l;
        prerr_string ": "
    | _ -> ()

let warning loc msg =
  prerr_string "parser: ";
  prerr_loc loc;
  prerr_endline msg

let error_count = ref 0
let error_count_max = 10000

let fatal loc msg =
  warning loc msg; exit 10

let flush_error () =
  if !error_count>=error_count_max then
    fatal None "Too many errors: quit"

let error loc msg =
  error_count := !error_count + 1;
  warning loc msg;
  if !error_count>=error_count_max then
    fatal loc "Too many errors: quit"

let gensym_count = ref 0
let gensym prefix =
  incr gensym_count;
  let s = string_of_int (!gensym_count) in
    prefix ^ s