cmd_ast_exception.ml

(* Copyright (C) 2015 - Hongbo Zhang, Authors of ReScript
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * In addition to the permissions granted to you by the LGPL, you may combine
 * or link a "work that uses the Library" with a publicly distributed version
 * of this file to produce a combined library or application, then distribute
 * that combined work under the terms of your choosing, with no requirement
 * to comply with the obligations normally placed on you by section 4 of the
 * LGPL version 3 (or the corresponding section of a later version of the LGPL
 * should you choose to use a later version).
 *
 * This program 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *)

type error = CannotRun of string | WrongMagic of string

exception Error of error

let report_error ppf = function
  | CannotRun cmd ->
      Format.fprintf ppf
        "Error while running external preprocessor@.Command line: %s@." cmd
  | WrongMagic cmd ->
      Format.fprintf ppf
        "External preprocessor does not produce a valid file@.Command line: \
         %s@."
        cmd

let () =
  Location.register_error_of_exn (function
    | Error err -> Some (Location.error_of_printer_file report_error err)
    | _ -> None)

let cannot_run comm = raise (Error (CannotRun comm))

let wrong_magic magic = raise (Error (WrongMagic magic))