Mercurial > urweb
diff tests/list.ur @ 757:fa2019a63ea4
Basis.list
| author | Adam Chlipala <adamc@hcoop.net> |
|---|---|
| date | Thu, 30 Apr 2009 11:07:29 -0400 |
| parents | 71bafe66dbe1 |
| children | 8323c1beef2e |
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--- a/tests/list.ur Tue Apr 28 17:26:53 2009 -0400 +++ b/tests/list.ur Thu Apr 30 11:07:29 2009 -0400 @@ -1,19 +1,17 @@ -datatype list a = Nil | Cons of a * list a +fun isNil (t ::: Type) (ls : list t) = + case ls of + Nil => True + | _ => False -val isNil = fn t ::: Type => fn ls : list t => - case ls of Nil => True | _ => False +fun delist (ls : list string) : xbody = + case ls of + Nil => <xml>Nil</xml> + | Cons (h, t) => <xml>{[h]} :: {delist t}</xml> -val show = fn b => if b then "True" else "False" +fun main () = return <xml><body> + {[isNil (Nil : list bool)]}, + {[isNil (Cons (1, Nil))]}, + {[isNil (Cons ("A", Cons ("B", Nil)))]} -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> + <p>{delist (Cons ("X", Cons ("Y", Cons ("Z", Nil))))}</p> +</body></xml>