Ur/Web: lib/top.ur annotate

foldTR2

author	Adam Chlipala <adamc@hcoop.net>
date	Sat, 13 Sep 2008 10:30:45 -0400
parents	58f1260f293f
children	f307cdd08d81

rev	line source
adamc@329	1 con idT = fn t :: Type => t
adamc@329	2 con record = fn t :: {Type} => $t
adamc@329	3
adamc@325	4 con mapTT (f :: Type -> Type) = fold (fn nm t acc => [nm] ~ acc =>
adamc@325	5 [nm = f t] ++ acc) []
adamc@325	6
adamc@325	7 fun compose (t1 ::: Type) (t2 ::: Type) (t3 ::: Type) (f1 : t2 -> t3) (f2 : t1 -> t2) (x : t1) = f1 (f2 x)
adamc@325	8
adamc@325	9 fun txt (t ::: Type) (ctx ::: {Unit}) (use ::: {Type}) (sh : show t) (v : t) = cdata (show sh v)
adamc@328	10
adamc@329	11 val foldTR2 (tf1 :: Type -> Type) (tf2 :: Type -> Type) (tr :: {Type} -> Type)
adamc@328	12 (f : nm :: Name -> t :: Type -> rest :: {Type} -> [nm] ~ rest
adamc@328	13 -> tf1 t -> tf2 t -> tr rest -> tr ([nm = t] ++ rest))
adamc@328	14 (i : tr []) =
adamc@328	15 fold [fn r :: {Type} => $(mapTT tf1 r) -> $(mapTT tf2 r) -> tr r]
adamc@328	16 (fn (nm :: Name) (t :: Type) (rest :: {Type}) (acc : _ -> _ -> tr rest) =>
adamc@328	17 [[nm] ~ rest] =>
adamc@328	18 fn r1 r2 => f [nm] [t] [rest] r1.nm r2.nm (acc (r1 -- nm) (r2 -- nm)))
adamc@328	19 (fn _ _ => i)

Mercurial > urweb