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datatype color = Red | White | Blue
fun c2s c =
case c of
Red => "Red"
| White => "White"
| Blue => "Blue"
val show_color = mkShow c2s
datatype list a = Nil | Cons of a * list a
fun isNil (t ::: Type) (ls : list t) =
case ls of
Nil => True
| _ => False
fun delist (ls : list string) : xml body [] [] =
case ls of
Nil => <xml>Nil</xml>
| Cons (h, t) => <xml>{[h]} :: {delist t}</xml>
fun main () : transaction page =
sInt <- source 0;
sFloat <- source 1.23;
sBoth <- source (7, 42.1);
sOpt <- source None;
sBool <- source True;
sColor <- source White;
sList <- source Nil;
return <xml><body>
<dyn signal={n <- signal sInt; return <xml>{[n + 3]}</xml>}/> <a onclick={set sInt 1}>Change</a><br/>
<dyn signal={n <- signal sFloat; return <xml>{[n + 1.0]}</xml>}/> <a onclick={set sFloat 4.56}>Change</a><br/>
<dyn signal={p <- signal sBoth; return <xml>{[p.1]}, {[p.2]}</xml>}/>;
<dyn signal={p <- signal sBoth; case p of
(7, _) => return <xml>Initial</xml>
| (fst, snd) => return <xml>{[fst]}, {[snd]}</xml>}/>
<a onclick={set sBoth (8, 100.001)}>Change</a><br/>
<dyn signal={o <- signal sOpt; case o of
None => return <xml>None</xml>
| Some n => return <xml>{[n]}</xml>}/>
<a onclick={set sOpt (Some 7)}>Change</a><br/>
<dyn signal={b <- signal sBool; return <xml>{[b]}</xml>}/>
<dyn signal={b <- signal sBool; if b then return <xml>Yes</xml> else return <xml>No</xml>}/>
<a onclick={set sBool False}>Change</a><br/>
<dyn signal={c <- signal sColor; return <xml>{[c]}</xml>}/>
<a onclick={set sColor Red}>Red</a>
<a onclick={set sColor White}>White</a>
<a onclick={set sColor Blue}>Blue</a><br/>
<dyn signal={ls <- signal sList; return <xml>{[isNil ls]}</xml>}/>;
<dyn signal={ls <- signal sList; return <xml>{delist ls}</xml>}/>
<a onclick={set sList (Cons ("A", Cons ("B", Nil)))}>Change</a><br/>
</body></xml>
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