mirror of
https://github.com/hasura/graphql-engine.git
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90 lines
2.3 KiB
Haskell
90 lines
2.3 KiB
Haskell
{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE LambdaCase #-}
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{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE OverloadedStrings #-}
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module Hasura.GraphQL.Utils
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( onNothing
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, showName
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, showNamedTy
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, throwVE
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, getBaseTy
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, mapFromL
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, groupTuples
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, groupListWith
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, mkMapWith
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, onLeft
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, showNames
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) where
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import Hasura.RQL.Types
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import Hasura.Prelude
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import qualified Data.HashMap.Strict as Map
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import qualified Data.List.NonEmpty as NE
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import qualified Data.Text as T
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import qualified Language.GraphQL.Draft.Syntax as G
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showName :: G.Name -> Text
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showName name = "\"" <> G.unName name <> "\""
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onNothing :: (Monad m) => Maybe a -> m a -> m a
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onNothing m act = maybe act return m
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throwVE :: (MonadError QErr m) => Text -> m a
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throwVE = throw400 ValidationFailed
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showNamedTy :: G.NamedType -> Text
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showNamedTy nt =
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"'" <> G.showNT nt <> "'"
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getBaseTy :: G.GType -> G.NamedType
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getBaseTy = \case
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G.TypeNamed n -> n
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G.TypeList lt -> getBaseTyL lt
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G.TypeNonNull nnt -> getBaseTyNN nnt
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where
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getBaseTyL = getBaseTy . G.unListType
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getBaseTyNN = \case
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G.NonNullTypeList lt -> getBaseTyL lt
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G.NonNullTypeNamed n -> n
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mapFromL :: (Eq k, Hashable k) => (a -> k) -> [a] -> Map.HashMap k a
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mapFromL f l =
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Map.fromList [(f v, v) | v <- l]
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groupListWith
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:: (Eq k, Hashable k, Foldable t, Functor t)
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=> (v -> k) -> t v -> Map.HashMap k (NE.NonEmpty v)
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groupListWith f l =
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groupTuples $ fmap (\v -> (f v, v)) l
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groupTuples
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:: (Eq k, Hashable k, Foldable t)
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=> t (k, v) -> Map.HashMap k (NE.NonEmpty v)
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groupTuples =
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foldr groupFlds Map.empty
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where
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groupFlds (k, v) m = case Map.lookup k m of
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Nothing -> Map.insert k (v NE.:| []) m
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Just s -> Map.insert k (v NE.<| s) m
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-- either duplicate keys or the map
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mkMapWith
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:: (Eq k, Hashable k, Foldable t, Functor t)
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=> (v -> k) -> t v -> Either (NE.NonEmpty k) (Map.HashMap k v)
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mkMapWith f l =
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case NE.nonEmpty dups of
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Just dupsNE -> Left dupsNE
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Nothing -> Right $ Map.map NE.head mapG
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where
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mapG = groupListWith f l
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dups = Map.keys $ Map.filter ((> 1) . length) mapG
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onLeft :: (Monad m) => Either e a -> (e -> m a) -> m a
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onLeft e f = either f return e
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showNames :: (Foldable t) => t G.Name -> Text
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showNames names =
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T.intercalate ", " $ map G.unName $ toList names
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