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feat: add Functor and Bifunctor instances to Result type #26

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feat: add Functor and Bifunctor instances to Result type #26

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9 changes: 9 additions & 0 deletions src/Toml/Schema/Matcher.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,7 @@ import Control.Applicative (Alternative(..))
import Control.Monad (MonadPlus, ap, liftM)
import Data.Monoid (Endo(..))
import Data.Text (Text)
import Data.Bifunctor (Bifunctor (..))

-- | Computations that result in a 'Result' and which track a list
-- of nested contexts to assist in generating warnings and error
Expand Down Expand Up @@ -130,6 +131,14 @@ data Result e a
Eq {- ^ Default instance -},
Ord {- ^ Default instance -})

instance Functor (Result e) where
fmap _ (Failure e) = Failure e
fmap f (Success e a) = Success e (f a)

instance Bifunctor Result where
bimap f _ (Failure e) = Failure (fmap f e)
bimap f g (Success e a) = Success (fmap f e) (g a)

-- | Run a 'Matcher' with an empty scope.
runMatcher :: Matcher l a -> Result (MatchMessage l) a
runMatcher (Matcher m) = m [] mempty (Failure . runDList) (Success . runDList)
Expand Down