forked from OSS/graphql
56 lines
1.4 KiB
Haskell
56 lines
1.4 KiB
Haskell
{-# LANGUAGE CPP #-}
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module Data.GraphQL.Schema where
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#if !MIN_VERSION_base(4,8,0)
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import Control.Applicative ((<$>))
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#endif
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import Data.String (IsString(fromString))
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import Data.Aeson (ToJSON(toJSON))
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import Data.HashMap.Strict (HashMap)
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import Data.Text (Text, pack)
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data Schema f = Schema (QueryRoot f)
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type QueryRoot f = Resolver f
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type Resolver f = Input -> f Output
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data Output = OutputObject (HashMap Text Output)
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| OutputList [Output]
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| OutputScalar Scalar
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| OutputEnum Text
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deriving (Show)
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type Argument = (Text, Scalar)
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type Subs = Text -> Maybe Scalar
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data Input = InputField Text [Argument] [Input]
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deriving (Show)
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-- TODO: GraphQL spec for Integer Scalar is 32bits
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data Scalar = ScalarInt Int
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| ScalarFloat Double
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| ScalarString Text
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| ScalarBoolean Bool
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| ScalarID Text
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deriving (Show)
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instance IsString Scalar where
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fromString = ScalarString . pack
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instance ToJSON Scalar where
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toJSON (ScalarInt x) = toJSON x
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toJSON (ScalarFloat x) = toJSON x
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toJSON (ScalarString x) = toJSON x
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toJSON (ScalarBoolean x) = toJSON x
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toJSON (ScalarID x) = toJSON x
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instance ToJSON Output where
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toJSON (OutputObject x) = toJSON $ toJSON <$> x
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toJSON (OutputList x) = toJSON $ toJSON <$> x
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toJSON (OutputScalar x) = toJSON x
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toJSON (OutputEnum x) = toJSON x
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