functor-combo-0.0.6: Functor combinators with tries & zippers

FunctorCombo.ZipperReg

Description

Synopsis

type Context t = [Der (PF t) t]Source

Context for a regular type

type Zipper t = (Context t, t)Source

Zipper for a regular type. Also called "location"

up :: (Regular t, Holey (PF t)) => Zipper t -> Zipper tSource

Move upward. Error if empty context.

up' :: (Regular t, Holey (PF t)) => Zipper t -> Maybe (Zipper t)Source

Variant of up. Nothing if empty context.

up

Nothing

down :: (Regular t, Holey (PF t)) => Zipper t -> PF t (Zipper t)Source