Mercurial > urweb
diff demo/more/conference.ur @ 1001:1d456a06ea4e
Add tuple pattern-matching at the constructor level
author | Adam Chlipala <adamc@hcoop.net> |
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date | Tue, 20 Oct 2009 10:19:00 -0400 |
parents | |
children | 61c30f0742d7 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/demo/more/conference.ur Tue Oct 20 10:19:00 2009 -0400 @@ -0,0 +1,33 @@ +con reviewMeta = fn (db :: Type, widget :: Type) => + {Show : db -> xbody, + Widget : nm :: Name -> xml form [] [nm = widget], + WidgetPopulated : nm :: Name -> db -> xml form [] [nm = widget], + Parse : widget -> db, + Inject : sql_injectable db} + +fun default [t] (sh : show t) (rd : read t) (inj : sql_injectable t) : reviewMeta (t, string) = + {Show = txt, + Widget = fn [nm :: Name] => <xml><textbox{nm}/></xml>, + WidgetPopulated = fn [nm :: Name] n => + <xml><textbox{nm} value={show n}/></xml>, + Parse = readError, + Inject = _} + +val int = default +val float = default +val string = default +val bool = {Show = txt, + Widget = fn [nm :: Name] => <xml><checkbox{nm}/></xml>, + WidgetPopulated = fn [nm :: Name] b => + <xml><checkbox{nm} checked={b}/></xml>, + Parse = fn x => x, + Inject = _} + +functor Make(M : sig + con review :: {(Type * Type)} + val review : $(map reviewMeta review) + end) = struct + + fun main () = return <xml/> + +end