Ur/Web: demo/cookie.ur annotate

Interpret 'table' signature items more flexibly, automatically adding (Ur) constraints to support a kind of subtyping over (SQL) constraint sets

author	Adam Chlipala <adam@chlipala.net>
date	Mon, 04 Nov 2013 15:14:23 -0500
parents	93315ac00394
children

rev	line source
adamc@464	1 cookie c : {A : string, B : float, C : int}
adamc@464	2
adamc@464	3 fun set r =
adamc@1050	4 setCookie c {Value = {A = r.A, B = readError r.B, C = readError r.C},
adamc@1050	5 Expires = None,
adamc@1050	6 Secure = False};
adamc@464	7 return <xml>Cookie set.</xml>
adamc@464	8
adamc@1050	9 fun setExp r =
adamc@1050	10 setCookie c {Value = {A = r.A, B = readError r.B, C = readError r.C},
adamc@1050	11 Expires = Some (readError "2012-11-6 00:00:00"),
adamc@1050	12 Secure = False};
adamc@1050	13 return <xml>Cookie set robustly.</xml>
adamc@1050	14
adamc@1050	15 fun delete () =
adamc@1050	16 clearCookie c;
adamc@1050	17 return <xml>Cookie cleared.</xml>
adamc@1050	18
adamc@464	19 fun main () =
adamc@464	20 ro <- getCookie c;
adamc@465	21 return <xml><body>
adamc@465	22 {case ro of
adamc@465	23 None => <xml>No cookie set.</xml>
adamc@1050	24 \| Some v => <xml>
adamc@1050	25 Cookie: A = {[v.A]}, B = {[v.B]}, C = {[v.C]}<br/>
adamc@1050	26 <form><submit value="Delete" action={delete}/></form>
adamc@1050	27 </xml>}
adamc@465	28 <br/><br/>
adamc@464	29
adamc@465	30 <form>
adamc@465	31 A: <textbox{#A}/><br/>
adamc@465	32 B: <textbox{#B}/><br/>
adamc@465	33 C: <textbox{#C}/><br/>
adamc@465	34 <submit action={set}/>
adamc@1050	35 </form><br/>
adamc@1050	36
adamc@1050	37 <form>
adamc@1050	38 <b>Version that expires on November 6, 2012:</b><br/>
adamc@1050	39 A: <textbox{#A}/><br/>
adamc@1050	40 B: <textbox{#B}/><br/>
adamc@1050	41 C: <textbox{#C}/><br/>
adamc@1050	42 <submit action={setExp}/>
adamc@465	43 </form>
adamc@465	44 </body></xml>

Mercurial > urweb