| Safe Haskell | Safe-Inferred |
|---|
DDC.Type.Env
Description
Type environments.
An environment contains the types named bound variables, named primitives, and a deBruijn stack for anonymous variables.
- data Env n = Env {
- envMap :: !(Map n (Type n))
- envStack :: ![Type n]
- envStackLength :: !Int
- envPrimFun :: !(n -> Maybe (Type n))
- type SuperEnv n = Env n
- type KindEnv n = Env n
- type TypeEnv n = Env n
- empty :: Env n
- singleton :: Ord n => Bind n -> Env n
- extend :: Ord n => Bind n -> Env n -> Env n
- extends :: Ord n => [Bind n] -> Env n -> Env n
- union :: Ord n => Env n -> Env n -> Env n
- unions :: Ord n => [Env n] -> Env n
- fromList :: Ord n => [Bind n] -> Env n
- fromTypeMap :: Map n (Type n) -> Env n
- depth :: Env n -> Int
- member :: Ord n => Bound n -> Env n -> Bool
- memberBind :: Ord n => Bind n -> Env n -> Bool
- lookup :: Ord n => Bound n -> Env n -> Maybe (Type n)
- lookupName :: Ord n => n -> Env n -> Maybe (Type n)
- setPrimFun :: (n -> Maybe (Type n)) -> Env n -> Env n
- isPrim :: Env n -> n -> Bool
- wrapTForalls :: Ord n => Env n -> Type n -> Type n
- lift :: Ord n => Int -> Env n -> Env n
Documentation
A type environment.
Constructors
| Env | |
Fields
| |
Construction
extend :: Ord n => Bind n -> Env n -> Env nSource
Extend an environment with a new binding. Replaces bindings with the same name already in the environment.
extends :: Ord n => [Bind n] -> Env n -> Env nSource
Extend an environment with a list of new bindings. Replaces bindings with the same name already in the environment.
union :: Ord n => Env n -> Env n -> Env nSource
Combine two environments. If both environments have a binding with the same name, then the one in the second environment takes preference.
unions :: Ord n => [Env n] -> Env nSource
Combine multiple environments, with the latter ones taking preference.
Conversion
fromTypeMap :: Map n (Type n) -> Env nSource
Convert a map of names to types to a environment.
Projections
member :: Ord n => Bound n -> Env n -> BoolSource
Check whether a bound variable is present in an environment.
memberBind :: Ord n => Bind n -> Env n -> BoolSource
Check whether a binder is already present in the an environment. This can only return True for named binders, not anonymous or primitive ones.
lookup :: Ord n => Bound n -> Env n -> Maybe (Type n)Source
Lookup a bound variable from an environment.
lookupName :: Ord n => n -> Env n -> Maybe (Type n)Source
Lookup a bound name from an environment.
Primitives
setPrimFun :: (n -> Maybe (Type n)) -> Env n -> Env nSource
Set the function that knows the types of primitive things.
isPrim :: Env n -> n -> BoolSource
Check if the type of a name is defined by the envPrimFun.
Lifting
wrapTForalls :: Ord n => Env n -> Type n -> Type nSource
Wrap locally bound (non primitive) variables defined in an environment around a type as new foralls.