Ur/Web: demo/buffer.ur annotate

Destructing local let, to the point where demo compiles

author	Adam Chlipala <adamc@hcoop.net>
date	Thu, 28 May 2009 12:07:05 -0400
parents	755a71c99be5
children

rev	line source
adamc@697	1 datatype lines = End \| Line of string * source lines
adamc@697	2
adamc@697	3 type t = { Head : source lines, Tail : source (source lines) }
adamc@697	4
adamc@697	5 val create =
adamc@697	6 head <- source End;
adamc@697	7 tail <- source head;
adamc@697	8 return {Head = head, Tail = tail}
adamc@697	9
adamc@697	10 fun renderL lines =
adamc@697	11 case lines of
adamc@697	12 End => <xml/>
adamc@697	13 \| Line (line, linesS) => <xml>{[line]}<br/><dyn signal={renderS linesS}/></xml>
adamc@697	14
adamc@697	15 and renderS linesS =
adamc@697	16 lines <- signal linesS;
adamc@697	17 return (renderL lines)
adamc@697	18
adamc@697	19 fun render t = renderS t.Head
adamc@697	20
adamc@697	21 fun write t s =
adamc@697	22 oldTail <- get t.Tail;
adamc@697	23 newTail <- source End;
adamc@697	24 set oldTail (Line (s, newTail));
adamc@697	25 set t.Tail newTail

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