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|
fun getOpt (t ::: Type) (o : option t) (v : t) : t =
case o of
None => v
| Some x => x
datatype color = Red | White | Blue
fun colorToString c =
case c of
Red => "R"
| White => "W"
| Blue => "B"
val show_color = mkShow colorToString
cookie int : int
cookie float : float
cookie string : string
cookie bool : bool
cookie pair : int * float
cookie option : option int
cookie color : color
fun main () : transaction page =
n <- getCookie int;
n <- return (getOpt n 7);
sn <- source 6;
f <- getCookie float;
f <- return (getOpt f 1.23);
sf <- source 4.56;
s <- getCookie string;
s <- return (getOpt s "Hi");
ss <- source "Bye";
b <- getCookie bool;
b <- return (getOpt b True);
sb <- source False;
p <- getCookie pair;
p <- return (getOpt p (1, 2.3));
sp <- source (4, 5.6);
o <- getCookie option;
o <- return (getOpt o (Some 1));
so <- source None;
c <- getCookie color;
c <- return (getOpt c White);
sc <- source Blue;
return <xml><body>
<dyn signal={n <- signal sn; return <xml>{[n]}</xml>}/>
<a onclick={set sn n}>CHANGE</a><br/>
<dyn signal={f <- signal sf; return <xml>{[f]}</xml>}/>
<a onclick={set sf f}>CHANGE</a><br/>
<dyn signal={s <- signal ss; return <xml>{[s]}</xml>}/>
<a onclick={set ss s}>CHANGE</a><br/>
<dyn signal={b <- signal sb; return <xml>{[b]}</xml>}/>
<a onclick={set sb b}>CHANGE</a><br/>
<dyn signal={p <- signal sp; return <xml>{[p.1]}, {[p.2]}</xml>}/>
<a onclick={set sp p}>CHANGE</a><br/>
<dyn signal={o <- signal so; case o of
None => return <xml>None</xml>
| Some x => return <xml>{[x]}</xml>}/>
<a onclick={set so o}>CHANGE</a><br/>
<dyn signal={c <- signal sc; return <xml>{[c]}</xml>}/>
<a onclick={set sc c}>CHANGE</a><br/>
</body></xml>
|
