36 lines
1.3 KiB
Haskell
36 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 Control.Monad.IO.Class (MonadIO)
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import qualified Data.Aeson as Aeson
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import Data.List.NonEmpty (NonEmpty)
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import qualified Data.Text as T
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import Language.GraphQL.Error
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import Language.GraphQL.Execute
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import Language.GraphQL.Parser
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import qualified Language.GraphQL.Schema as 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.Resolver's.
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graphql :: MonadIO m
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=> NonEmpty (Schema.Resolver m) -- ^ Resolvers.
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-> T.Text -- ^ Text representing a @GraphQL@ request document.
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-> m Aeson.Value -- ^ Response.
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graphql = flip graphqlSubs $ const Nothing
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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.Resolver's.
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graphqlSubs :: MonadIO m
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=> NonEmpty (Schema.Resolver m) -- ^ Resolvers.
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-> Schema.Subs -- ^ Variable substitution function.
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-> T.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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