forked from OSS/graphql
35 lines
1.2 KiB
Haskell
35 lines
1.2 KiB
Haskell
-- | This module provides the functions to parse and execute @GraphQL@ queries.
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module Data.GraphQL where
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import Control.Applicative (Alternative)
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import Data.Text (Text)
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import qualified Data.Aeson as Aeson
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import qualified Data.Attoparsec.Text as Attoparsec
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import Data.GraphQL.Execute
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import Data.GraphQL.Parser
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import Data.GraphQL.Schema
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import Data.GraphQL.Error
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-- | Takes a 'Schema' and text representing a @GraphQL@ request document.
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-- If the text parses correctly as a @GraphQL@ query the query is
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-- executed according to the given 'Schema'.
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--
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-- Returns the response as an @Aeson.@'Aeson.Value'.
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graphql :: (Alternative m, Monad m) => Schema m -> Text -> m Aeson.Value
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graphql = flip graphqlSubs $ const Nothing
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-- | Takes a 'Schema', a variable substitution function and text
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-- representing a @GraphQL@ request document. If the text parses
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-- correctly as a @GraphQL@ query the substitution is applied to the
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-- query and the query is then executed according to the given 'Schema'.
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--
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-- Returns the response as an @Aeson.@'Aeson.Value'.
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graphqlSubs :: (Alternative m, Monad m) => Schema m -> Subs -> Text -> m Aeson.Value
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graphqlSubs schema f =
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either parseError (execute schema f)
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. Attoparsec.parseOnly document
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