Mercurial > urweb
diff tests/list.lac @ 196:890a61991263
Lists all the way through
| author | Adam Chlipala <adamc@hcoop.net> |
|---|---|
| date | Sat, 09 Aug 2008 16:48:32 -0400 |
| parents | |
| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tests/list.lac Sat Aug 09 16:48:32 2008 -0400 @@ -0,0 +1,19 @@ +datatype list a = Nil | Cons of a * list a + +val isNil = fn t ::: Type => fn ls : list t => + case ls of Nil => True | _ => False + +val show = fn b => if b then "True" else "False" + +val rec delist : list string -> xml body [] [] = fn x => + case x of + Nil => <body>Nil</body> + | Cons (h, t) => <body>{cdata h} :: {delist t}</body> + +val main : unit -> page = fn () => <html><body> + {cdata (show (isNil (Nil : list bool)))}, + {cdata (show (isNil (Cons (1, Nil))))}, + {cdata (show (isNil (Cons ("A", Cons ("B", Nil)))))} + + <p>{delist (Cons ("X", Cons ("Y", Cons ("Z", Nil))))}</p> +</body></html>