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con colMeta = fn t_formT :: (Type * Type) => {
Nam : string,
Show : t_formT.1 -> xbody,
Widget : nm :: Name -> xml form [] [nm = t_formT.2],
WidgetPopulated : nm :: Name -> t_formT.1 -> xml form [] [nm = t_formT.2],
Parse : t_formT.2 -> t_formT.1,
Inject : sql_injectable t_formT.1
}
con colsMeta = fn cols :: {(Type * Type)} => $(Top.mapT2T colMeta cols)
fun default (t ::: Type) (sh : show t) (rd : read t) (inj : sql_injectable t)
name : colMeta (t, string) =
{Nam = name,
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 _ _ _
fun bool name = {Nam = name,
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 cols :: {(Type * Type)}
constraint [Id] ~ cols
val tab : sql_table ([Id = int] ++ mapT2T fstTT cols)
val title : string
val cols : colsMeta cols
end) = struct
open constraints M
val tab = M.tab
sequence seq
fun create (inputs : $(mapT2T sndTT M.cols)) =
id <- nextval seq;
() <- dml (insert tab
(foldT2R2 [sndTT] [colMeta]
[fn cols => $(mapT2T (fn t :: (Type * Type) =>
sql_exp [] [] [] t.1) cols)]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] =>
fn input col acc => acc with nm = sql_inject col.Inject (col.Parse input))
{} [M.cols] inputs M.cols
with #Id = (SQL {id})));
return <xml><body>
Inserted with ID {txt _ id}.
</body></xml>
fun save (id : int) (inputs : $(mapT2T sndTT M.cols)) =
() <- dml (update [mapT2T fstTT M.cols]
(foldT2R2 [sndTT] [colMeta]
[fn cols => $(mapT2T (fn t :: (Type * Type) =>
sql_exp [T = [Id = int]
++ mapT2T fstTT M.cols]
[] [] t.1) cols)]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] =>
fn input col acc => acc with nm =
sql_inject col.Inject (col.Parse input))
{} [M.cols] inputs M.cols)
tab (WHERE T.Id = {id}));
return <xml><body>
Saved!
</body></xml>
fun update (id : int) =
fso <- oneOrNoRows (SELECT tab.{{mapT2T fstTT M.cols}} FROM tab WHERE tab.Id = {id});
case fso : (Basis.option {Tab : $(mapT2T fstTT M.cols)}) of
None => return <xml><body>Not found!</body></xml>
| Some fs => return <xml><body><form>
{foldT2R2 [fstTT] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] (v : t.1) (col : colMeta t)
(acc : xml form [] (mapT2T sndTT rest)) =>
<xml>
<li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li>
{useMore acc}
</xml>)
<xml/>
[M.cols] fs.Tab M.cols}
<submit action={save id}/>
</form></body></xml>
fun delete (id : int) =
() <- dml (DELETE FROM tab WHERE Id = {id});
return <xml><body>
The deed is done.
</body></xml>
fun confirm (id : int) = return <xml><body>
<p>Are you sure you want to delete ID #{txt _ id}?</p>
<p><a link={delete id}>I was born sure!</a></p>
</body></xml>
fun main () =
rows <- queryX (SELECT * FROM tab AS T)
(fn (fs : {T : $([Id = int] ++ mapT2T fstTT M.cols)}) => <xml>
<tr>
<td>{txt _ fs.T.Id}</td>
{foldT2RX2 [fstTT] [colMeta] [tr]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] v col => <xml>
<td>{col.Show v}</td>
</xml>)
[M.cols] (fs.T -- #Id) M.cols}
<td>
<a link={update fs.T.Id}>[Update]</a>
<a link={confirm fs.T.Id}>[Delete]</a>
</td>
</tr>
</xml>);
return <xml><head>
<title>{cdata M.title}</title>
</head><body>
<h1>{cdata M.title}</h1>
<table border={1}>
<tr>
<th>ID</th>
{foldT2RX [colMeta] [tr]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] col => <xml>
<th>{cdata col.Nam}</th>
</xml>)
[M.cols] M.cols}
</tr>
{rows}
</table>
<br/>
<form>
{foldT2R [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
(fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
[[nm] ~ rest] (col : colMeta t) (acc : xml form [] (mapT2T sndTT rest)) => <xml>
<li> {cdata col.Nam}: {col.Widget [nm]}</li>
{useMore acc}
</xml>)
<xml/>
[M.cols] M.cols}
<submit action={create}/>
</form>
</body></xml>
end
|
