(*  Title:      Pure/ML-Systems/compiler_polyml-5.3.ML

 Runtime compilation for Poly/ML 5.3.0.

 *)

 local

 fun drop_newline s =

   if String.isSuffix "\n" s then String.substring (s, 0, size s - 1)

   else s;

 in

 fun use_text ({tune_source, name_space, str_of_pos, print, error, ...}: use_context)

     (start_line, name) verbose txt =

   let

     val line = Unsynchronized.ref start_line;

     val in_buffer = Unsynchronized.ref (String.explode (tune_source txt));

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

     fun output () = drop_newline (implode (rev (! out_buffer)));

     fun get () =

       (case ! in_buffer of

         [] => NONE

       | c :: cs => (in_buffer := cs; if c = #"\n" then line := ! line + 1 else (); SOME c));

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

     fun put_message {message = msg1, hard, location = {startLine = line, ...}, context} =

      (put (if hard then "Error: " else "Warning: ");

       PolyML.prettyPrint (put, 76) msg1;

       (case context of NONE => () | SOME msg2 => PolyML.prettyPrint (put, 76) msg2);

       put ("At" ^ str_of_pos line name ^ "\n"));

     val parameters =

      [PolyML.Compiler.CPOutStream put,

       PolyML.Compiler.CPNameSpace name_space,

       PolyML.Compiler.CPErrorMessageProc put_message,

       PolyML.Compiler.CPLineNo (fn () => ! line),

       PolyML.Compiler.CPFileName name,

       PolyML.Compiler.CPPrintInAlphabeticalOrder false];

     val _ =

       (while not (List.null (! in_buffer)) do

         PolyML.compiler (get, parameters) ())

       handle exn =>

        (put ("Exception- " ^ General.exnMessage exn ^ " raised");

         error (output ()); reraise exn);

   in 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;

 end;