Mercurial > urweb
view tests/dynlines.ur @ 1989:210fb3dfc483
Some more nested functor bug-fixing, including generating fresh internal names at applications; still need to debug issues with datatype constructors
author | Adam Chlipala <adam@chlipala.net> |
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date | Thu, 20 Feb 2014 10:27:15 -0500 |
parents | 38297294cf98 |
children |
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datatype lines = End | Line of 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 linesS => <xml>X<br/><dyn signal={renderS linesS}/></xml> and renderS linesS = lines <- signal linesS; return (renderL lines) fun render t = renderS t.Head fun write t = oldTail <- get t.Tail; newTail <- source End; set oldTail (Line newTail); set t.Tail newTail fun main () : transaction page = b <- create; return <xml><body> <button onclick={fn _ => write b}/> <dyn signal={render b}/> </body></xml>