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con stringify = fold (fn nm :: Name => fn u :: Unit => fn t :: {Type} => [nm = string] ++ t) []
signature S = sig
con rs :: {Unit}
val names : $(stringify rs)
end
signature S' = sig
con rs :: {Unit}
val handler : $(stringify rs) -> page
val page : unit -> page
end
functor F (M : S) : S' where con rs = M.rs = struct
con rs = M.rs
val handler = fn x : $(stringify M.rs) => <html><body>
{fold [fn rs :: {Unit} => $(stringify rs) -> $(stringify rs) -> xml body [] []]
(fn nm :: Name => fn u :: Unit => fn rest :: {Unit} =>
fn f : $(stringify rest) -> $(stringify rest) -> xml body [] [] =>
fn names : $(stringify ([nm] ++ rest)) =>
fn x : $(stringify ([nm] ++ rest)) =>
<body><li> {cdata names.nm}: {cdata x.nm}</li> {f (names -- nm) (x -- nm)}</body>)
(fn names => fn x => <body></body>)
[M.rs] M.names x}
</body></html>
val page = fn () => <html><body>
<lform>
{fold [fn rs :: {Unit} => xml lform [] (stringify rs)]
(fn nm :: Name => fn u :: Unit => fn rest :: {Unit} =>
fn frag : xml lform [] (stringify rest) =>
<lform><li> <textbox{nm}/></li> {useMore frag}</lform>)
<lform></lform>
[rs]}
<submit action={handler}/>
</lform>
</body></html>
end
structure M = F(struct
con rs = [A, B, C]
val names = {A = "A", B = "B", C = "C"}
end)
open M
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