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

     ID:         $Id$

 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 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 (1, name) output verbose txt end;