70 lines
2.3 KiB
Haskell
70 lines
2.3 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE OverloadedStrings #-}
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module Test.StarWars.Schema where
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#if !MIN_VERSION_base(4,8,0)
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import Control.Applicative (pure)
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import Data.Traversable (traverse)
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#endif
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import Control.Applicative (Alternative, empty)
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import Data.Foldable (fold)
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import Data.HashMap.Strict (HashMap)
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import qualified Data.HashMap.Strict as HashMap
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import Data.Text (Text)
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import Data.GraphQL.Schema
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import Test.StarWars.Data
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-- * Schema
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-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsSchema.js
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schema :: (Alternative m, Monad m) => Schema m
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schema = Schema query
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query :: (Alternative m, Monad m) => QueryRoot m
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query (InputField "hero" args ins) = hero args ins
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query (InputField "human" args ins) = human args ins
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query (InputField "droid" args ins) = droid args ins
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query _ = empty
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hero :: Alternative f => [Argument] -> [Input] -> f Output
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hero [] = characterFields artoo
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hero [("episode", ScalarInt n)] = characterFields $ getHero n
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hero _ = const empty
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human :: (Alternative m, Monad m) => [Argument] -> [Input] -> m Output
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human [("id", ScalarString i)] ins = flip characterFields ins =<< getHuman i
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human _ _ = empty
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droid :: (Alternative m, Monad m) => [Argument] -> [Input] -> m Output
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droid [("id", ScalarString i)] ins = flip characterFields ins =<< getDroid i
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droid _ _ = empty
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episode :: Alternative f => Int -> f Output
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episode 4 = pure $ OutputEnum "NEWHOPE"
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episode 5 = pure $ OutputEnum "EMPIRE"
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episode 6 = pure $ OutputEnum "JEDI"
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episode _ = empty
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characterField :: Alternative f => Character -> Input -> f (HashMap Text Output)
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characterField char (InputField "id" [] []) =
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pure . HashMap.singleton "id" . OutputScalar . ScalarString . id_ $ char
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characterField char (InputField "name" [] []) =
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pure . HashMap.singleton "name" . OutputScalar . ScalarString . name $ char
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characterField char (InputField "friends" [] ins) =
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fmap (HashMap.singleton "friends" . OutputList)
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. traverse (`characterFields` ins)
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. getFriends
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$ char
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characterField char (InputField "appearsIn" [] []) =
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fmap (HashMap.singleton "appearsIn" . OutputList)
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. traverse episode
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. appearsIn
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$ char
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characterField _ _ = empty
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characterFields :: Alternative f => Character -> [Input] -> f Output
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characterFields char = fmap (OutputObject . fold) . traverse (characterField char)
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