(*
 * Get the toplevel exports from a skeleton.
 *
 * (C) 1999 Lucent Technologies, Bell Laboratories
 *
 * contact: Matthias Blume (blume@cs.princeton.edu)
 *)
signature SKELEXPORTS = sig
    val exports : Skeleton.decl -> SymbolSet.set
end

structure SkelExports :> SKELEXPORTS = struct

    structure SK = Skeleton
    structure SS = SymbolSet

    fun exports d = let
	fun e (SK.Bind (s, _), a) = SS.add (a, s)
	  | e (SK.Local (l, b), a) = e (b, a)
	  | e (SK.Par l, a) = foldl e a l
	  | e (SK.Seq l, a) = foldl e a l
	  | e (SK.Open _, a) = a	(* cannot happen *)
	  | e (SK.Ref _, a) = a
    in
	e (d, SS.empty)
    end
end

<script type="text/javascript">//<![CDATA[
		function toggle_ffErrors() {
			var errorsblock = document.getElementById("ffErrorsBlock");
			var errorsgroup = document.getElementById("ffErrors");
			if (errorsblock.style.display == "none") {
				errorsblock.style.display = "block";
				errorsgroup.style.right = "10px";
			} else {
				errorsblock.style.display = "none";
				errorsgroup.style.right = "300px";
			}
		}
//]]></script>
<div id="ffErrors">
<a href="javascript:toggle_ffErrors();">Click to toggle</a>
<div id="ffErrorsBlock">
	<div class="error">does not end with &lt;/html&gt; tag</div>
	<div class="error">does not end with &lt;/body&gt; tag</div>
	<div class="info">The output has ended thus:  (SK.Open _, a) = a	(* cannot happen *)
	  | e (SK.Ref _, a) = a
    in
	e (d, SS.empty)
    end
end</div>
</div></div>
</body></html>