146 lines
4.9 KiB
Haskell
146 lines
4.9 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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module Test.StarWars.Schema
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( schema
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) where
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import Control.Monad.Trans.Reader (asks)
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import Control.Monad.Trans.Except (throwE)
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import Control.Monad.Trans.Class (lift)
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import Data.Functor.Identity (Identity)
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import qualified Data.HashMap.Strict as HashMap
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import Data.Maybe (catMaybes)
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import Data.Text (Text)
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import Language.GraphQL.Type
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import qualified Language.GraphQL.Type.In as In
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import qualified Language.GraphQL.Type.Out as Out
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import Test.StarWars.Data
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import Prelude hiding (id)
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-- See https://github.com/graphql/graphql-js/blob/master/src/__tests__/starWarsSchema.js
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schema :: Schema Identity
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schema = Schema { query = queryType, mutation = Nothing }
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where
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queryType = Out.ObjectType "Query" Nothing [] $ HashMap.fromList
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[ ("hero", heroField)
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, ("human", humanField)
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, ("droid", droidField)
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]
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heroArguments = HashMap.singleton "episode"
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$ In.Argument Nothing (In.NamedEnumType episodeEnum) Nothing
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heroField =
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Out.Field Nothing (Out.NamedObjectType heroObject) heroArguments hero
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humanArguments = HashMap.singleton "id"
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$ In.Argument Nothing (In.NonNullScalarType string) Nothing
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humanField =
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Out.Field Nothing (Out.NamedObjectType heroObject) humanArguments human
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droidField = Out.Field Nothing (Out.NamedObjectType droidObject) mempty droid
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heroObject :: Out.ObjectType Identity
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heroObject = Out.ObjectType "Human" Nothing [] $ HashMap.fromList
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[ ("id", idFieldType)
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, ("name", nameFieldType)
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, ("friends", friendsFieldType)
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, ("appearsIn", appearsInField)
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, ("homePlanet", homePlanetFieldType)
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, ("secretBackstory", secretBackstoryFieldType)
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, ("__typename", typenameFieldType)
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]
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where
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homePlanetFieldType = Out.Field Nothing (Out.NamedScalarType string) mempty
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$ idField "homePlanet"
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droidObject :: Out.ObjectType Identity
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droidObject = Out.ObjectType "Droid" Nothing [] $ HashMap.fromList
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[ ("id", idFieldType)
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, ("name", nameFieldType)
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, ("friends", friendsFieldType)
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, ("appearsIn", appearsInField)
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, ("primaryFunction", primaryFunctionFieldType)
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, ("secretBackstory", secretBackstoryFieldType)
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, ("__typename", typenameFieldType)
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]
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where
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primaryFunctionFieldType = Out.Field Nothing (Out.NamedScalarType string) mempty
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$ idField "primaryFunction"
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typenameFieldType :: Out.Field Identity
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typenameFieldType = Out.Field Nothing (Out.NamedScalarType string) mempty
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$ idField "__typename"
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idFieldType :: Out.Field Identity
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idFieldType = Out.Field Nothing (Out.NamedScalarType id) mempty
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$ idField "id"
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nameFieldType :: Out.Field Identity
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nameFieldType = Out.Field Nothing (Out.NamedScalarType string) mempty
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$ idField "name"
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friendsFieldType :: Out.Field Identity
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friendsFieldType = Out.Field Nothing (Out.ListType $ Out.NamedObjectType droidObject) mempty
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$ idField "friends"
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appearsInField :: Out.Field Identity
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appearsInField = Out.Field (Just description) fieldType mempty
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$ idField "appearsIn"
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where
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fieldType = Out.ListType $ Out.NamedEnumType episodeEnum
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description = "Which movies they appear in."
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secretBackstoryFieldType :: Out.Field Identity
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secretBackstoryFieldType = Out.Field Nothing (Out.NamedScalarType string) mempty
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$ String <$> secretBackstory
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idField :: Text -> ResolverT Identity Value
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idField f = do
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v <- ResolverT $ lift $ asks values
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let (Object v') = v
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pure $ v' HashMap.! f
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episodeEnum :: EnumType
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episodeEnum = EnumType "Episode" (Just description)
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$ HashMap.fromList [newHope, empire, jedi]
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where
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description = "One of the films in the Star Wars Trilogy"
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newHope = ("NEW_HOPE", EnumValue $ Just "Released in 1977.")
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empire = ("EMPIRE", EnumValue $ Just "Released in 1980.")
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jedi = ("JEDI", EnumValue $ Just "Released in 1983.")
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hero :: ResolverT Identity Value
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hero = do
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episode <- argument "episode"
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pure $ character $ case episode of
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Enum "NEW_HOPE" -> getHero 4
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Enum "EMPIRE" -> getHero 5
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Enum "JEDI" -> getHero 6
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_ -> artoo
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human :: ResolverT Identity Value
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human = do
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id' <- argument "id"
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case id' of
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String i -> do
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humanCharacter <- lift $ return $ getHuman i >>= Just
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case humanCharacter of
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Nothing -> pure Null
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Just e -> pure $ character e
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_ -> ResolverT $ throwE "Invalid arguments."
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droid :: ResolverT Identity Value
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droid = do
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id' <- argument "id"
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case id' of
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String i -> character <$> getDroid i
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_ -> ResolverT $ throwE "Invalid arguments."
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character :: Character -> Value
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character char = Object $ HashMap.fromList
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[ ("id", String $ id_ char)
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, ("name", String $ name_ char)
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, ("friends", List $ character <$> getFriends char)
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, ("appearsIn", List $ Enum <$> catMaybes (getEpisode <$> appearsIn char))
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, ("homePlanet", String $ either mempty homePlanet char)
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, ("__typename", String $ typeName char)
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]
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