functor-combo-0.0.5: Functor combinators with tries & zippers
FunctorCombo.ZipperReg
Description
Synopsis
type Context t = [Der (PF t) t]Source
Context for a regular type
type Location t = (Context t, t)Source
Location for a regular type -- a zipper
up :: (Regular t, Holey (PF t)) => Location t -> Location tSource
Move upward. Error if empty context.
up' :: (Regular t, Holey (PF t)) => Location t -> Maybe (Location t)Source
Variant of up. Nothing if empty context.
up
Nothing
down :: (Regular t, Holey (PF t)) => Location t -> PF t (Location t)Source