Ur/Web: lib/top.urs annotate

foldTR2

author	Adam Chlipala <adamc@hcoop.net>
date	Sat, 13 Sep 2008 10:30:45 -0400
parents	e457d8972ff1
children	02d15d81ae9b

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 = fn f :: Type -> Type => fold (fn nm t acc => [nm] ~ acc =>
adamc@325	5 [nm = f t] ++ acc) []
adamc@325	6
adamc@325	7 val compose : t1 ::: Type -> t2 ::: Type -> t3 ::: Type
adamc@325	8 -> (t2 -> t3) -> (t1 -> t2) -> (t1 -> t3)
adamc@325	9
adamc@325	10 val txt : t ::: Type -> ctx ::: {Unit} -> use ::: {Type} -> show t -> t
adamc@325	11 -> xml ctx use []
adamc@329	12
adamc@329	13 val foldTR2 : tf1 :: (Type -> Type) -> tf2 :: (Type -> Type) -> tr :: ({Type} -> Type)
adamc@329	14 -> (nm :: Name -> t :: Type -> rest :: {Type} -> [nm] ~ rest
adamc@329	15 -> tf1 t -> tf2 t -> tr rest -> tr ([nm = t] ++ rest))
adamc@329	16 -> tr [] -> r :: {Type} -> $(mapTT tf1 r) -> $(mapTT tf2 r) -> tr r

Mercurial > urweb