32 lines
1.1 KiB
Haskell
32 lines
1.1 KiB
Haskell
{- This Source Code Form is subject to the terms of the Mozilla Public License,
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v. 2.0. If a copy of the MPL was not distributed with this file, You can
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obtain one at https://mozilla.org/MPL/2.0/. -}
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-- | This module contains default rules defined in the GraphQL specification.
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module Language.GraphQL.Validate.Rules
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( Rule(..)
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, executableDefinitionsRule
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, specifiedRules
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) where
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import Language.GraphQL.AST.Document
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-- | 'Rule' assigns a function to each AST node that can be validated. If the
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-- validation fails, the function should return an error message, or 'Nothing'
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-- otherwise.
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newtype Rule
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= DefinitionRule (Definition -> Maybe String)
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-- | Default reules given in the specification.
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specifiedRules :: [Rule]
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specifiedRules =
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[ executableDefinitionsRule
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]
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-- | Definition must be OperationDefinition or FragmentDefinition.
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executableDefinitionsRule :: Rule
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executableDefinitionsRule = DefinitionRule go
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where
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go (ExecutableDefinition _definition _) = Nothing
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go _ = Just "Definition must be OperationDefinition or FragmentDefinition."
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