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Define a function computing the maximum metavariable bound in a diff.

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Rob Rix 2017-09-10 19:50:01 +01:00
parent 7ada1dea20
commit 3e2c883b3a
1 changed files with 6 additions and 0 deletions
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6
src/Diff.hs
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@ -52,6 +52,12 @@ freeMetavariables = cata $ \ diff -> case diff of
Var v -> Set.singleton v
Patch patch -> foldMap fold patch
maxBoundMetavariable :: (Foldable syntax, Functor syntax) => Diff syntax ann -> Maybe Metavar
maxBoundMetavariable = cata $ \ diff -> case diff of
Copy bindings _ -> foldr (max . Just . fst) Nothing bindings
Var _ -> Nothing
Patch patch -> foldr (max . foldr max Nothing) Nothing patch
newtype Env a = Env { unEnv :: [(Metavar, a)] }
deriving (Eq, Foldable, Functor, Monoid, Ord, Show, Traversable)