src/Pure/ML-Systems/polyml_old_compiler4.ML

merged

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

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

fun use_text ({tune_source, print, error, ...}: use_context) (line: int, name) verbose txt =
  let
    val in_buffer = ref (explode (tune_source 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 =>
      (error ((if name = "" then "" else "Error in " ^ name ^ "\n") ^ output ()); raise exn);
    if verbose then print (output ()) else ()
  end;

fun use_file context verbose name =
  let
    val instream = TextIO.openIn name;
    val txt = Exn.release (Exn.capture TextIO.inputAll instream before TextIO.closeIn instream);
  in use_text context (1, name) verbose txt end;