parent
c075a41582
commit
2b5c719ab0
@ -14,8 +14,8 @@ import qualified Language.GraphQL.AST as Full
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import qualified Language.GraphQL.AST.Core as Core
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import qualified Language.GraphQL.Schema as Schema
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-- | Replaces a fragment name by a list of 'Field'. If the name doesn't match an
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-- empty list is returned.
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-- | Replaces a fragment name by a list of 'Core.Field'. If the name doesn't
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-- match an empty list is returned.
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type Fragmenter = Core.Name -> [Core.Field]
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-- | Rewrites the original syntax tree into an intermediate representation used
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@ -1,5 +1,7 @@
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE RecordWildCards #-}
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-- | Error handling.
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module Language.GraphQL.Error
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( parseError
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, CollectErrsT
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@ -28,9 +28,7 @@ module Language.GraphQL.Schema
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import Control.Monad.IO.Class (MonadIO(..))
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import Control.Monad.Trans.Class (lift)
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import Control.Monad.Trans.Except (runExceptT)
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import Data.Foldable ( find
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, fold
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)
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import Data.Foldable (find, fold)
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import Data.List.NonEmpty (NonEmpty)
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import Data.Maybe (fromMaybe)
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import qualified Data.Aeson as Aeson
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@ -48,16 +46,13 @@ import Language.GraphQL.AST.Core
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-- @m@ is usually expected to be an instance of 'MonadIO'.
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type Schema m = NonEmpty (Resolver m)
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-- | Resolves a 'Field' into an @Aeson.@'Aeson.Object' with error information
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-- (or 'empty'). @m@ is usually expected to be an instance of 'MonadIO.
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-- | Resolves a 'Field' into an @Aeson.@'Data.Aeson.Types.Object' with error
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-- information (if an error has occurred). @m@ is usually expected to be an
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-- instance of 'MonadIO'.
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data Resolver m = Resolver
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Text -- ^ Name
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(Field -> CollectErrsT m Aeson.Object) -- ^ Resolver
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type Fields = [Field]
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type Arguments = [Argument]
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-- | Variable substitution function.
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type Subs = Name -> Maybe Value
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@ -67,14 +62,14 @@ object name = objectA name . const
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-- | Like 'object' but also taking 'Argument's.
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objectA :: MonadIO m
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=> Name -> (Arguments -> ActionT m [Resolver m]) -> Resolver m
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=> Name -> ([Argument] -> ActionT m [Resolver m]) -> Resolver m
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objectA name f = Resolver name $ resolveFieldValue f resolveRight
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where
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resolveRight fld@(Field _ _ _ flds) resolver = withField (resolve resolver flds) fld
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-- | Like 'object' but also taking 'Argument's and can be null or a list of objects.
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wrappedObjectA :: MonadIO m
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=> Name -> (Arguments -> ActionT m (Wrapping [Resolver m])) -> Resolver m
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=> Name -> ([Argument] -> ActionT m (Wrapping [Resolver m])) -> Resolver m
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wrappedObjectA name f = Resolver name $ resolveFieldValue f resolveRight
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where
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resolveRight fld@(Field _ _ _ sels) resolver
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@ -91,14 +86,14 @@ scalar name = scalarA name . const
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-- | Like 'scalar' but also taking 'Argument's.
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scalarA :: (MonadIO m, Aeson.ToJSON a)
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=> Name -> (Arguments -> ActionT m a) -> Resolver m
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=> Name -> ([Argument] -> ActionT m a) -> Resolver m
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scalarA name f = Resolver name $ resolveFieldValue f resolveRight
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where
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resolveRight fld result = withField (return result) fld
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-- | Lika 'scalar' but also taking 'Argument's and can be null or a list of scalars.
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wrappedScalarA :: (MonadIO m, Aeson.ToJSON a)
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=> Name -> (Arguments -> ActionT m (Wrapping a)) -> Resolver m
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=> Name -> ([Argument] -> ActionT m (Wrapping a)) -> Resolver m
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wrappedScalarA name f = Resolver name $ resolveFieldValue f resolveRight
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where
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resolveRight fld (Named result) = withField (return result) fld
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@ -116,14 +111,14 @@ enum :: MonadIO m => Name -> ActionT m [Text] -> Resolver m
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enum name = enumA name . const
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{-# DEPRECATED enumA "Use scalarA instead" #-}
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enumA :: MonadIO m => Name -> (Arguments -> ActionT m [Text]) -> Resolver m
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enumA :: MonadIO m => Name -> ([Argument] -> ActionT m [Text]) -> Resolver m
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enumA name f = Resolver name $ resolveFieldValue f resolveRight
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where
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resolveRight fld resolver = withField (return resolver) fld
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{-# DEPRECATED wrappedEnumA "Use wrappedScalarA instead" #-}
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wrappedEnumA :: MonadIO m
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=> Name -> (Arguments -> ActionT m (Wrapping [Text])) -> Resolver m
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=> Name -> ([Argument] -> ActionT m (Wrapping [Text])) -> Resolver m
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wrappedEnumA name f = Resolver name $ resolveFieldValue f resolveRight
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where
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resolveRight fld (Named resolver) = withField (return resolver) fld
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@ -158,7 +153,7 @@ withField v fld
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-- 'Resolver' to each 'Field'. Resolves into a value containing the
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-- resolved 'Field', or a null value and error information.
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resolve :: MonadIO m
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=> [Resolver m] -> Fields -> CollectErrsT m Aeson.Value
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=> [Resolver m] -> [Field] -> CollectErrsT m Aeson.Value
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resolve resolvers = fmap (Aeson.toJSON . fold) . traverse tryResolvers
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where
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tryResolvers fld = maybe (errmsg fld) (tryResolver fld) $ find (compareResolvers fld) resolvers
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@ -1,4 +1,4 @@
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resolver: lts-14.5
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resolver: lts-14.6
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packages:
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- '.'
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extra-deps: []
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