| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
Data.Generics.PlateDirect
Contents
Description
Deprecated: Use Data.Generics.Uniplate.Direct instead
DEPRECATED: Use Data.Generics.Uniplate.Direct instead.
This module supplies a method for writing Biplate instances more easily.
This module requires fewest extensions, highest performance, and most instance
definitions.
To take an example:
data Expr = Var Int | Pos Expr String | Neg Expr | Add Expr Expr
data Stmt = Seq [Stmt] | Sel [Expr] | Let String Expr
instance Uniplate Expr where
uniplate (Var x ) = plate Var |- x
uniplate (Pos x y) = plate Pos |* x |- y
uniplate (Neg x ) = plate Neg |* x
uniplate (Add x y) = plate Add |* x |* y
instance Biplate Expr Expr where
biplate = plateSelf
instance Uniplate Stmt where
uniplate (Seq x ) = plate Seq ||* x
uniplate (Sel x ) = plate Sel ||+ x
uniplate (Let x y) = plate Let |- x |- y
instance Biplate Stmt Stmt where
biplate = plateSelf
instance Biplate Stmt Expr where
biplate (Seq x ) = plate Seq ||+ x
biplate (Sel x ) = plate Sel ||* x
biplate (Let x y) = plate Let |- x |* ySynopsis
- module Data.Generics.Biplate
- plate :: from -> Type from to
- plateSelf :: to -> Type to to
- (|+) :: Biplate item to => Type (item -> from) to -> item -> Type from to
- (|-) :: Type (item -> from) to -> item -> Type from to
- (|*) :: Type (to -> from) to -> to -> Type from to
- (||+) :: Biplate item to => Type ([item] -> from) to -> [item] -> Type from to
- (||*) :: Type ([to] -> from) to -> [to] -> Type from to
Documentation
module Data.Generics.Biplate
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)
(|+) :: Biplate 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.