Ur/Web: demo/listFun.ur annotate

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author	Adam Chlipala <adamc@hcoop.net>
date	Thu, 30 Oct 2008 15:33:28 -0400
parents	e756d3a47726
children	7ef4b2911b09

rev	line source
adamc@398	1 open List
adamc@398	2
adamc@386	3 functor Make(M : sig
adamc@386	4 type t
adamc@398	5 val toString : t -> string
adamc@398	6 val fromString : string -> option t
adamc@386	7 end) = struct
adamc@398	8 fun toXml (ls : list M.t) =
adamc@398	9 case ls of
adamc@398	10 Nil => <xml>[]</xml>
adamc@398	11 \| Cons (x, ls') => <xml>{[M.toString x]} :: {toXml ls'}</xml>
adamc@398	12
adamc@398	13 fun console (ls : list M.t) = return <xml><body>
adamc@398	14 Current list: {toXml ls}<br/>
adamc@400	15 Reversed list: {toXml (rev ls)}<br/>
adamc@399	16 Length: {[length ls]}<br/>
adamc@399	17 <br/>
adamc@398	18
adamc@398	19 <form>
adamc@398	20 Add element: <textbox{#X}/> <submit action={cons ls}/>
adamc@398	21 </form>
adamc@398	22 </body></xml>
adamc@398	23
adamc@398	24 and cons (ls : list M.t) (r : {X : string}) =
adamc@398	25 case M.fromString r.X of
adamc@398	26 None => return <xml><body>Invalid string!</body></xml>
adamc@398	27 \| Some v => console (Cons (v, ls))
adamc@398	28
adamc@398	29 fun main () = console Nil
adamc@386	30 end

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