Portability | non-portable (GHC Extensions) |
---|---|
Stability | experimental |
Maintainer | Patrick Bahr <paba@diku.dk> |
This module defines an abstract notion of (bound) variables in compositional data types, and scoped substitution. Capture-avoidance is not taken into account. All definitions are generalised versions of those in Data.Comp.Variables.
- class HasVars f v where
- type GSubst v a = NatM Maybe (K v) a
- type CxtSubst h a f v = GSubst v (Cxt h f a)
- type Subst f v = CxtSubst NoHole (K ()) f v
- varsToHoles :: forall f v. (HFunctor f, HasVars f v, Eq v) => Term f :-> Context f (K v)
- containsVar :: (Eq v, HasVars f v, HFoldable f, HFunctor f) => v -> Cxt h f a :=> Bool
- variables :: (Ord v, HasVars f v, HFoldable f, HFunctor f) => Cxt h f a :=> Set v
- variableList :: (HasVars f v, HFoldable f, HFunctor f, Eq v) => Cxt h f a :=> [v]
- variables' :: (Ord v, HasVars f v, HFoldable f, HFunctor f) => Const f :=> Set v
- substVars :: SubstVars v t a => GSubst v t -> a :-> a
- appSubst :: SubstVars v t a => GSubst v t -> a :-> a
- compSubst :: (Ord v, HasVars f v, HFunctor f) => CxtSubst h a f v -> CxtSubst h a f v -> CxtSubst h a f v
Documentation
This multiparameter class defines functors with variables. An instance
HasVar f v
denotes that values over f
might contain and bind variables of
type v
.
containsVar :: (Eq v, HasVars f v, HFoldable f, HFunctor f) => v -> Cxt h f a :=> BoolSource
This function checks whether a variable is contained in a context.
variables :: (Ord v, HasVars f v, HFoldable f, HFunctor f) => Cxt h f a :=> Set vSource
This function computes the set of variables occurring in a context.
variableList :: (HasVars f v, HFoldable f, HFunctor f, Eq v) => Cxt h f a :=> [v]Source
This function computes the list of variables occurring in a context.