37 lines
1.3 KiB
Haskell
37 lines
1.3 KiB
Haskell
-- | This module provides the functions to parse and execute @GraphQL@ queries.
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module Language.GraphQL
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( graphql
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, graphqlSubs
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) where
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import qualified Data.Aeson as Aeson
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import Data.HashMap.Strict (HashMap)
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import Data.Text (Text)
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import Language.GraphQL.AST.Document
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import Language.GraphQL.AST.Parser
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import Language.GraphQL.Error
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import Language.GraphQL.Execute
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import Language.GraphQL.Execute.Coerce
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import Language.GraphQL.Type.Schema
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import Text.Megaparsec (parse)
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-- | If the text parses correctly as a @GraphQL@ query the query is
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-- executed using the given 'Schema'.
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graphql :: Monad m
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=> Schema m -- ^ Resolvers.
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-> Text -- ^ Text representing a @GraphQL@ request document.
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-> m Aeson.Value -- ^ Response.
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graphql = flip graphqlSubs (mempty :: Aeson.Object)
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-- | If the text parses correctly as a @GraphQL@ query the substitution is
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-- applied to the query and the query is then executed using to the given
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-- 'Schema'.
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graphqlSubs :: (Monad m, VariableValue a)
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=> Schema m -- ^ Resolvers.
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-> HashMap Name a -- ^ Variable substitution function.
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-> Text -- ^ Text representing a @GraphQL@ request document.
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-> m Aeson.Value -- ^ Response.
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graphqlSubs schema f
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= either parseError (execute schema f)
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. parse document ""
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