64 lines
1.9 KiB
Haskell
64 lines
1.9 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE DeriveDataTypeable #-}
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{-# LANGUAGE DeriveFoldable #-}
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{-# LANGUAGE DeriveFunctor #-}
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{-# LANGUAGE DeriveTraversable #-}
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{-# LANGUAGE TypeOperators #-}
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{-# OPTIONS_HADDOCK not-home #-}
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module Servant.API.Alternative ((:<|>)(..)) where
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import Control.Applicative (liftA2)
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import Data.Biapplicative
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(Biapplicative (..))
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import Data.Bifoldable
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(Bifoldable (..))
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import Data.Bifunctor
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(Bifunctor (..))
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import Data.Bitraversable
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(Bitraversable (..))
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import Data.Semigroup
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(Semigroup (..))
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import Data.Typeable
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(Typeable)
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import Prelude ()
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import Prelude.Compat
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-- | Union of two APIs, first takes precedence in case of overlap.
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--
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-- Example:
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--
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-- >>> :{
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--type MyApi = "books" :> Get '[JSON] [Book] -- GET /books
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-- :<|> "books" :> ReqBody '[JSON] Book :> Post '[JSON] () -- POST /books
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-- :}
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data a :<|> b = a :<|> b
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deriving (Typeable, Eq, Show, Functor, Traversable, Foldable, Bounded)
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infixr 3 :<|>
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instance (Semigroup a, Semigroup b) => Semigroup (a :<|> b) where
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(a :<|> b) <> (a' :<|> b') = (a <> a') :<|> (b <> b')
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instance (Monoid a, Monoid b) => Monoid (a :<|> b) where
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mempty = mempty :<|> mempty
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(a :<|> b) `mappend` (a' :<|> b') = (a `mappend` a') :<|> (b `mappend` b')
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instance Bifoldable (:<|>) where
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bifoldMap f g ~(a :<|> b) = f a `mappend` g b
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instance Bifunctor (:<|>) where
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bimap f g ~(a :<|> b) = f a :<|> g b
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instance Biapplicative (:<|>) where
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bipure = (:<|>)
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(f :<|> g) <<*>> (a :<|> b) = f a :<|> g b
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instance Bitraversable (:<|>) where
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bitraverse f g ~(a :<|> b) = liftA2 (:<|>) (f a) (g b)
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-- $setup
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-- >>> import Servant.API
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-- >>> import Data.Aeson
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-- >>> import Data.Text
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-- >>> data Book
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-- >>> instance ToJSON Book where { toJSON = undefined }
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