bb685c9afa
The first end-to-end test taken from `graphql-js` passes but this still needs to be extended to support more general cases. - `Data.GraphQL.Schema` has been heavily modified to support the execution model. More drastic changes are expected in this module. - When defining a `Schema` ordinary functions taking fields as input are being used instead of maps. This makes the implementation of `execute` easier, and, arguably, makes `Schema` definitions more *Haskellish*. - Drop explicit `unordered-containers` dependency. `Aeson.Value`s and field functions should be good enough for now.
33 lines
1.1 KiB
Haskell
33 lines
1.1 KiB
Haskell
{-# LANGUAGE CPP #-}
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{-# LANGUAGE OverloadedLists #-}
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module Data.GraphQL.Execute where
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#if !MIN_VERSION_base(4,8,0)
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import Control.Applicative (Applicative)
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#endif
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import qualified Data.Aeson as Aeson
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import Data.GraphQL.AST
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import Data.GraphQL.Schema
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type Response = Aeson.Value
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execute :: Schema -> Document -> Maybe Response
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execute (Schema resolv0) doc = go resolv0 =<< root doc
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where
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root :: Document -> Maybe Selection
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root (Document [DefinitionOperation (Query (Node _ _ _ [sel]))]) = Just sel
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root _ = error "root: Not implemented yet"
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go :: Resolver -> Selection -> Maybe Response
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go resolv (SelectionField (Field _ n _ _ sfs)) =
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case resolv (InputField n) of
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(OutputScalar s) -> if null sfs
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then Just $ Aeson.Object [(n, Aeson.toJSON s)]
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else Nothing
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(OutputResolver resolv') -> (\r-> Aeson.Object [(n, r)]) <$> go resolv' (head sfs)
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_ -> error "go case resolv: Not implemented yet"
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go _ _ = error "go: Not implemented yet"
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