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{-# LANGUAGE CPP #-}
module Data.GraphQL.Schema where
#if !MIN_VERSION_base(4,8,0)
import Control.Applicative ((<$>))
#endif
import Data.Aeson (ToJSON(toJSON))
import Data.HashMap.Strict (HashMap)
import Data.Text (Text)
data Schema f = Schema (QueryRoot f) -- (Maybe MutationRoot)
type QueryRoot f = Resolver f
type Resolver f = Input -> f Output
data Output = OutputObject (HashMap Text Output)
| OutputList [Output]
| OutputScalar Scalar
| OutputEnum Text
deriving (Show)
-- | OutputUnion [Output]
-- | OutputNonNull (Output)
type Argument = (Text, Scalar)
data Input = InputField Text [Argument] [Input]
deriving (Show)
-- TODO: Make ScalarInt Int32
data Scalar = ScalarInt Int
| ScalarFloat Double
| ScalarString Text
| ScalarBoolean Bool
| ScalarID Text
deriving (Show)
instance ToJSON Scalar where
toJSON (ScalarInt x) = toJSON x
toJSON (ScalarFloat x) = toJSON x
toJSON (ScalarString x) = toJSON x
toJSON (ScalarBoolean x) = toJSON x
toJSON (ScalarID x) = toJSON x
instance ToJSON Output where
toJSON (OutputObject x) = toJSON $ toJSON <$> x
toJSON (OutputList x) = toJSON $ toJSON <$> x
toJSON (OutputScalar x) = toJSON x
toJSON (OutputEnum x) = toJSON x
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