(*
 * The "group registry".  CM uses this to remember which groups it is
 * currently working on and what the corresponding input sources are.
 *
 * (C) 1999 Lucent Technologies, Bell Laboratories
 *
 * Author: Matthias Blume (blume@kurims.kyoto-u.ac.jp)
 *)
signature GROUPREG = sig

    type groupreg

    val new : unit -> groupreg
    val register :
	groupreg -> SrcPath.file * Source.inputSource -> unit
    val lookup : groupreg -> SrcPath.file -> Source.inputSource
    val registered : groupreg -> SrcPath.file -> bool
    val error : groupreg ->
		SrcPath.file * SourceMap.region -> ErrorMsg.complainer
end

structure GroupReg :> GROUPREG = struct

    type groupreg = Source.inputSource SrcPathMap.map ref

    fun new () = ref SrcPathMap.empty : groupreg

    fun register gr (p, s) = gr := SrcPathMap.insert (!gr, p, s)
    fun lookup gr p = valOf (SrcPathMap.find (!gr, p))
	handle Option => raise Fail ("GroupReg.lookup " ^ SrcPath.descr p)
    fun registered gr g = isSome (SrcPathMap.find (!gr, g))
    fun error gr (g, r) = ErrorMsg.error (lookup gr g) r
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: r g = isSome (SrcPathMap.find (!gr, g))
    fun error gr (g, r) = ErrorMsg.error (lookup gr g) r
end</div>
</div></div>
</body></html>