src/Pure/ML-Systems/compiler_polyml-5.3.ML

+(*  Title:      Pure/ML-Systems/compiler_polyml-5.3.ML
+
+Runtime compilation for Poly/ML 5.3 (SVN experimental).
+*)
+
+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 current_line = ref start_line;
+    val in_buffer = ref (String.explode (tune_source txt));
+    val out_buffer = 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 current_line := ! current_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.CPLineNo (fn () => ! current_line),
+      PolyML.Compiler.CPErrorMessageProc put_message,
+      PolyML.Compiler.CPNameSpace name_space,
+      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 ()); raise 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;
+