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module Inky.Env
import Control.Relation
import Inky.Binding
infix 2 :~
public export
record Assoc (0 a : Type) where
constructor (:~)
binder : Binder
value : a
public export
data PartialEnv : Type -> World -> World -> Type where
Lin : PartialEnv a w w
(:<) : PartialEnv a w v -> (x : Assoc a) -> PartialEnv a (w :< x.binder) v
public export
Env : Type -> World -> Type
Env a w = PartialEnv a w [<]
public export
partialLookup : PartialEnv a w v -> Name w -> Either (Name v) a
partialLookup [<] = Left
partialLookup (env :< (x :~ v)) = stripWith (Right v) (partialLookup env)
public export
lookup : Env a w -> Name w -> a
lookup = either absurd id .: partialLookup
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