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datatype lines = End | Line of string * source lines
type t = { Head : source lines, Tail : source (source lines) }
val create =
head <- source End;
tail <- source head;
return {Head = head, Tail = tail}
fun renderL lines =
case lines of
End => <xml/>
| Line (line, linesS) => <xml>{[line]}<br/><dyn signal={renderS linesS}/></xml>
and renderS linesS =
lines <- signal linesS;
return (renderL lines)
fun render t = renderS t.Head
fun write t s =
oldTail <- get t.Tail;
newTail <- source End;
set oldTail (Line (s, newTail));
set t.Tail newTail
|
