uniplate-1.6.12: Help writing simple, concise and fast generic operations.

Safe HaskellNone
LanguageHaskell98

Data.Generics.PlateTypeable

Contents

Description

Deprecated: Use Data.Generics.Uniplate.Typeable instead

DEPRECATED: Use Data.Generics.Uniplate.Typeable instead.

This module supplies a method for writing Biplate instances more easily.

To take an example:

data Expr = Var Int | Neg Expr | Add Expr Expr

instance Typeable Expr where ...

instance (Typeable a, Uniplate a) => PlateAll Expr a where
  plateAll (Var x  ) = plate Var |- x
  plateAll (Neg x  ) = plate Neg |+ x
  plateAll (Add x y) = plate Add |+ x |+ y

instance Uniplate Expr where
  uniplate = uniplateAll

Synopsis

Documentation

The Class

class PlateAll from to where Source

This class represents going from the container type to the target.

This class should only be constructed with plate, |+ and |-

Methods

plateAll :: from -> Type from to Source

Instances

PlateAll Bool to 
PlateAll Char to 
PlateAll Double to 
PlateAll Float to 
PlateAll Int to 
PlateAll Integer to 
PlateAll () to 
(PlateAll from to, Typeable * from, Typeable * to, Uniplate to) => PlateAll [from] to 
(PlateAll from to, Typeable * from, Typeable * to, Uniplate to) => PlateAll (Maybe from) to 
(PlateAll a to, Typeable * a, PlateAll b to, Typeable * b, Typeable * to, Uniplate to) => PlateAll (Either a b) to 
(PlateAll a to, Typeable * a, PlateAll b to, Typeable * b, Typeable * to, Uniplate to) => PlateAll (a, b) to 
(PlateAll a to, Typeable * a, PlateAll b to, Typeable * b, PlateAll c to, Typeable * c, Typeable * to, Uniplate to) => PlateAll (a, b, c) to 
(PlateAll a to, Typeable * a, PlateAll b to, Typeable * b, PlateAll c to, Typeable * c, PlateAll d to, Typeable * d, Typeable * to, Uniplate to) => PlateAll (a, b, c, d) to 
(PlateAll a to, Typeable * a, PlateAll b to, Typeable * b, PlateAll c to, Typeable * c, PlateAll d to, Typeable * d, PlateAll e to, Typeable * e, Typeable * to, Uniplate to) => PlateAll (a, b, c, d, e) to 

uniplateAll :: PlateAll a b => a -> (Str b, Str b -> a) Source

This function is used to write a Uniplate instance from a PlateAll one

The Combinators

plate :: from -> Type from to Source

The main combinator used to start the chain.

The following rule can be used for optimisation:

plate Ctor |- x == plate (Ctor x)

(|+) :: (Typeable item, Typeable to, PlateAll item to) => Type (item -> from) to -> item -> Type from to Source

the field to the right may contain the target.

(|-) :: Type (item -> from) to -> item -> Type from to Source

The field to the right does not contain the target. This can be used as either an optimisation, or more commonly for excluding primitives such as Int.