servant/servant/src/Servant/API/Alternative.hs

42 lines
1.3 KiB
Haskell

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