(*  Title:      Pure/ML-Systems/polyml_old_compiler4.ML

Runtime compilation -- for old PolyML.compiler (version 4.x).

*)

fun use_text (tune: string -> string) _ _ (line: int, name) (print, err) verbose txt =

  let

    val in_buffer = ref (explode (tune txt));

    val out_buffer = ref ([]: string list);

    fun output () = implode (rev (case ! out_buffer of "\n" :: cs => cs | cs => cs));

    fun get () =

      (case ! in_buffer of

        [] => ""

      | c :: cs => (in_buffer := cs; c));

    fun put s = out_buffer := s :: ! out_buffer;

    fun exec () =

      (case ! in_buffer of

        [] => ()

      | _ => (PolyML.compiler (get, put) (); exec ()));

  in

    exec () handle exn =>

      (err ((if name = "" then "" else "Error in " ^ name ^ "\n") ^ output ()); raise exn);

    if verbose then print (output ()) else ()

  end;

fun use_file tune str_of_pos name_space output verbose name =

  let

    val instream = TextIO.openIn name;

    val txt = Exn.release (Exn.capture TextIO.inputAll instream before TextIO.closeIn instream);

  in use_text tune str_of_pos name_space (1, name) output verbose txt end;