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{-# LANGUAGE CPP #-}
{-# LANGUAGE OverloadedLists #-}
module Data.GraphQL.Execute where
#if !MIN_VERSION_base(4,8,0)
import Control.Applicative (Applicative)
#endif
import qualified Data.Aeson as Aeson
import Data.GraphQL.AST
import Data.GraphQL.Schema
type Response = Aeson.Value
execute :: Schema -> Document -> Maybe Response
execute (Schema resolv0) doc = go resolv0 =<< root doc
where
root :: Document -> Maybe Selection
root (Document [DefinitionOperation (Query (Node _ _ _ [sel]))]) = Just sel
root _ = error "root: Not implemented yet"
go :: Resolver -> Selection -> Maybe Response
go resolv (SelectionField (Field _ n _ _ sfs)) =
case resolv (InputField n) of
(OutputScalar s) -> if null sfs
then Just $ Aeson.Object [(n, Aeson.toJSON s)]
else Nothing
(OutputResolver resolv') -> (\r-> Aeson.Object [(n, r)]) <$> go resolv' (head sfs)
_ -> error "go case resolv: Not implemented yet"
go _ _ = error "go: Not implemented yet"
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