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Put JSON support behind a flag

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This commit is contained in:
Eugen Wissner
2021-12-24 13:35:18 +01:00
parent df078a59d0
commit 116aa1f6bb
8 changed files with 136 additions and 159 deletions
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9
src/Language/GraphQL.hs
View File

@ -1,3 +1,6 @@
{-# LANGUAGE CPP #-}
#ifdef WITH_JSON
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
@ -73,3 +76,9 @@ graphqlSubs schema operationName variableValues document' =
[ ("line", Aeson.toJSON line)
, ("column", Aeson.toJSON column)
]
#else
-- | This module provides the functions to parse and execute @GraphQL@ queries.
module Language.GraphQL
(
) where
#endif

107
src/Language/GraphQL/Execute/Coerce.hs
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@ -3,9 +3,9 @@
obtain one at https://mozilla.org/MPL/2.0/. -}
{-# LANGUAGE ExplicitForAll #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ViewPatterns #-}
{-# LANGUAGE CPP #-}
-- | Types and functions used for input and result coercion.
module Language.GraphQL.Execute.Coerce
@ -16,7 +16,10 @@ module Language.GraphQL.Execute.Coerce
, matchFieldValues
) where
#ifdef WITH_JSON
import qualified Data.Aeson as Aeson
import Data.Scientific (toBoundedInteger, toRealFloat)
#endif
import Data.Int (Int32)
import Data.HashMap.Strict (HashMap)
import qualified Data.HashMap.Strict as HashMap
@ -25,7 +28,6 @@ import Data.Text (Text)
import qualified Data.Text.Lazy as Text.Lazy
import qualified Data.Text.Lazy.Builder as Text.Builder
import qualified Data.Text.Lazy.Builder.Int as Text.Builder
import Data.Scientific (toBoundedInteger, toRealFloat)
import Language.GraphQL.AST (Name)
import Language.GraphQL.Execute.OrderedMap (OrderedMap)
import qualified Language.GraphQL.Execute.OrderedMap as OrderedMap
@ -63,22 +65,12 @@ class VariableValue a where
-> Maybe Type.Value -- ^ Coerced value on success, 'Nothing' otherwise.
instance VariableValue Type.Value where
coerceVariableValue = const Just
instance VariableValue Aeson.Value where
coerceVariableValue _ Aeson.Null = Just Type.Null
coerceVariableValue (In.ScalarBaseType scalarType) value
| (Aeson.String stringValue) <- value = Just $ Type.String stringValue
| (Aeson.Bool booleanValue) <- value = Just $ Type.Boolean booleanValue
| (Aeson.Number numberValue) <- value
, (Type.ScalarType "Float" _) <- scalarType =
Just $ Type.Float $ toRealFloat numberValue
| (Aeson.Number numberValue) <- value = -- ID or Int
Type.Int <$> toBoundedInteger numberValue
coerceVariableValue (In.EnumBaseType _) (Aeson.String stringValue) =
coerceVariableValue _ Type.Null = Just Type.Null
coerceVariableValue (In.ScalarBaseType _) value = Just value
coerceVariableValue (In.EnumBaseType _) (Type.Enum stringValue) =
Just $ Type.Enum stringValue
coerceVariableValue (In.InputObjectBaseType objectType) value
| (Aeson.Object objectValue) <- value = do
| (Type.Object objectValue) <- value = do
let (In.InputObjectType _ _ inputFields) = objectType
(newObjectValue, resultMap) <- foldWithKey objectValue inputFields
if HashMap.null newObjectValue
@ -98,14 +90,9 @@ instance VariableValue Aeson.Value where
pure (newObjectValue, insert coerced)
Nothing -> Just (objectValue, resultMap)
coerceVariableValue (In.ListBaseType listType) value
| (Aeson.Array arrayValue) <- value =
Type.List <$> foldr foldVector (Just []) arrayValue
| (Type.List arrayValue) <- value =
Type.List <$> traverse (coerceVariableValue listType) arrayValue
| otherwise = coerceVariableValue listType value
where
foldVector _ Nothing = Nothing
foldVector variableValue (Just list) = do
coerced <- coerceVariableValue listType variableValue
pure $ coerced : list
coerceVariableValue _ _ = Nothing
-- | Looks up a value by name in the given map, coerces it and inserts into the
@ -222,18 +209,26 @@ instance forall a. IsString (Output a) where
instance Serialize Type.Value where
null = Type.Null
serialize _ = \case
Int int -> Just $ Type.Int int
Float float -> Just $ Type.Float float
String string -> Just $ Type.String string
Boolean boolean -> Just $ Type.Boolean boolean
Enum enum -> Just $ Type.Enum enum
List list -> Just $ Type.List list
Object object -> Just
$ Type.Object
$ HashMap.fromList
$ OrderedMap.toList object
serialize (Out.ScalarBaseType scalarType) value
| Type.ScalarType "Int" _ <- scalarType
, Int int <- value = Just $ Type.Int int
| Type.ScalarType "Float" _ <- scalarType
, Float float <- value = Just $ Type.Float float
| Type.ScalarType "String" _ <- scalarType
, String string <- value = Just $ Type.String string
| Type.ScalarType "ID" _ <- scalarType
, String string <- value = Just $ Type.String string
| Type.ScalarType "Boolean" _ <- scalarType
, Boolean boolean <- value = Just $ Type.Boolean boolean
serialize _ (Enum enum) = Just $ Type.Enum enum
serialize _ (List list) = Just $ Type.List list
serialize _ (Object object) = Just
$ Type.Object
$ HashMap.fromList
$ OrderedMap.toList object
serialize _ _ = Nothing
#ifdef WITH_JSON
instance Serialize Aeson.Value where
serialize (Out.ScalarBaseType scalarType) value
| Type.ScalarType "Int" _ <- scalarType
@ -254,3 +249,47 @@ instance Serialize Aeson.Value where
$ Aeson.toJSON <$> object
serialize _ _ = Nothing
null = Aeson.Null
instance VariableValue Aeson.Value where
coerceVariableValue _ Aeson.Null = Just Type.Null
coerceVariableValue (In.ScalarBaseType scalarType) value
| (Aeson.String stringValue) <- value = Just $ Type.String stringValue
| (Aeson.Bool booleanValue) <- value = Just $ Type.Boolean booleanValue
| (Aeson.Number numberValue) <- value
, (Type.ScalarType "Float" _) <- scalarType =
Just $ Type.Float $ toRealFloat numberValue
| (Aeson.Number numberValue) <- value = -- ID or Int
Type.Int <$> toBoundedInteger numberValue
coerceVariableValue (In.EnumBaseType _) (Aeson.String stringValue) =
Just $ Type.Enum stringValue
coerceVariableValue (In.InputObjectBaseType objectType) value
| (Aeson.Object objectValue) <- value = do
let (In.InputObjectType _ _ inputFields) = objectType
(newObjectValue, resultMap) <- foldWithKey objectValue inputFields
if HashMap.null newObjectValue
then Just $ Type.Object resultMap
else Nothing
where
foldWithKey objectValue = HashMap.foldrWithKey matchFieldValues'
$ Just (objectValue, HashMap.empty)
matchFieldValues' _ _ Nothing = Nothing
matchFieldValues' fieldName inputField (Just (objectValue, resultMap)) =
let (In.InputField _ fieldType _) = inputField
insert = flip (HashMap.insert fieldName) resultMap
newObjectValue = HashMap.delete fieldName objectValue
in case HashMap.lookup fieldName objectValue of
Just variableValue -> do
coerced <- coerceVariableValue fieldType variableValue
pure (newObjectValue, insert coerced)
Nothing -> Just (objectValue, resultMap)
coerceVariableValue (In.ListBaseType listType) value
| (Aeson.Array arrayValue) <- value =
Type.List <$> foldr foldVector (Just []) arrayValue
| otherwise = coerceVariableValue listType value
where
foldVector _ Nothing = Nothing
foldVector variableValue (Just list) = do
coerced <- coerceVariableValue listType variableValue
pure $ coerced : list
coerceVariableValue _ _ = Nothing
#endif

8
src/Test/Hspec/GraphQL.hs
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@ -2,6 +2,9 @@
v. 2.0. If a copy of the MPL was not distributed with this file, You can
obtain one at https://mozilla.org/MPL/2.0/. -}
{-# LANGUAGE CPP #-}
#ifdef WITH_JSON
{-# LANGUAGE ExplicitForAll #-}
{-# LANGUAGE OverloadedStrings #-}
@ -39,3 +42,8 @@ shouldResolve executor query = do
response `shouldNotSatisfy` HashMap.member "errors"
_ -> expectationFailure
"the query is expected to resolve to a value, but it resolved to an event stream"
#else
module Test.Hspec.GraphQL
(
) where
#endif