Data.Comp.Annotation

This module defines annotations on signatures.

Documentation

data (f :&: a) e infixr 7

This data type adds a constant product (annotation) to a signature.

Constructors

(f e) :&: a infixr 7

Instances

DistAnn k f p ((:&:) k f p)

RemA k ((:&:) k f p) f

DistAnn k s p s' => DistAnn k ((:+:) k f s) p ((:+:) k ((:&:) k f p) s')

RemA k s s' => RemA k ((:+:) k ((:&:) k f p) s) ((:+:) k f s')

Functor f => Functor ((:&:) * f a)

Foldable f => Foldable ((:&:) * f a)

Traversable f => Traversable ((:&:) * f a)

HasVars f v => HasVars ((:&:) * f a) v

data (f :*: g) a infixr 8

Formal product of signatures (functors).

Constructors

(f a) :*: (g a) infixr 8

Instances

(Functor f, Functor g) => Functor ((:*:) * f g)

(Foldable f, Foldable g) => Foldable ((:*:) * f g)

(Traversable f, Traversable g) => Traversable ((:*:) * f g)

class DistAnn s p s' | s' -> s, s' -> p where

This class defines how to distribute an annotation over a sum of signatures.

Methods

injectA :: p -> s a -> s' a

Inject an annotation over a signature.

projectA :: s' a -> (s a, p)

Project an annotation from a signature.

Instances

DistAnn k f p ((:&:) k f p)

DistAnn k s p s' => DistAnn k ((:+:) k f s) p ((:+:) k ((:&:) k f p) s')

class RemA s s' | s -> s' where

Methods

remA :: s a -> s' a

Remove annotations from a signature.

Instances

RemA k ((:&:) k f p) f

RemA k s s' => RemA k ((:+:) k ((:&:) k f p) s) ((:+:) k f s')

liftA :: RemA s s' => (s' a -> t) -> s a -> t

Transform a function with a domain constructed from a functor to a function with a domain constructed with the same functor, but with an additional annotation.

liftA' :: (DistAnn s' p s, Functor s') => (s' a -> Cxt h s' a) -> s a -> Cxt h s a

Transform a function with a domain constructed from a functor to a function with a domain constructed with the same functor, but with an additional annotation.

stripA :: (RemA g f, Functor g) => CxtFun g f

Strip the annotations from a term over a functor with annotations.

propAnn :: (DistAnn f p f', DistAnn g p g', Functor g) => Hom f g -> Hom f' g'

Lift a term homomorphism over signatures f and g to a term homomorphism over the same signatures, but extended with annotations.

propAnnM :: (DistAnn f p f', DistAnn g p g', Functor g, Monad m) => HomM m f g -> HomM m f' g'

Lift a monadic term homomorphism over signatures f and g to a monadic term homomorphism over the same signatures, but extended with annotations.

ann :: (DistAnn f p g, Functor f) => p -> CxtFun f g

Annotate each node of a term with a constant value.

project' :: (RemA f f', s :<: f') => Cxt h f a -> Maybe (s (Cxt h f a))

This function is similar to project but applies to signatures with an annotation which is then ignored.