Hpp.Env

A name binding context, or environment.

Documentation

emptyEnv :: [a]

An empty binding environment.

insertPair :: a -> [a] -> [a]

Add a (key,value) pair to an environment.

deleteKey :: Eq a => a -> [(a, b)] -> [(a, b)]

Delete an entry from an association list.

lookupKey :: Eq a => a -> [(a, b)] -> Maybe (b, [(a, b)])

Looks up a value in an association list. If the key is found, the value is returned along with an updated association list with that key at the front.