Ur/Web: tests/rpcDD.ur annotate

Tutorial: hyperlinks for metaprogramming and row types

author	Adam Chlipala <adam@chlipala.net>
date	Wed, 20 Jul 2011 08:14:49 -0400
parents	63b0bcacd535
children

rev	line source
adamc@640	1 datatype list t = Nil \| OtherNil \| Cons of t * list t
adamc@640	2
adamc@640	3 table t : {A : int}
adamc@640	4
adamc@640	5 fun main () : transaction page =
adamc@640	6 let
adamc@640	7 fun rows () =
adamc@640	8 query (SELECT * FROM t)
adamc@640	9 (fn r ls => return (Cons (r.T.A, ls)))
adamc@640	10 Nil
adamc@640	11
adamc@640	12 fun show ls =
adamc@640	13 case ls of
adamc@640	14 Nil => <xml/>
adamc@640	15 \| OtherNil => <xml>That's impossible!</xml>
adamc@640	16 \| Cons (x, ls') => <xml>{[x]}<br/>{show ls'}</xml>
adamc@640	17 in
adamc@640	18 s <- source Nil;
adamc@640	19 return <xml><body>
adamc@640	20 <button value="Get It On!"
adamc@640	21 onclick={ls <- rows ();
adamc@640	22 set s ls}/><br/>
adamc@640	23 <br/>
adamc@640	24 Current: <dyn signal={ls <- signal s; return (show ls)}/>
adamc@640	25 </body></xml>
adamc@640	26 end

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