79 lines
1.9 KiB
Haskell
79 lines
1.9 KiB
Haskell
-- | This is the AST meant to be executed.
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module Language.GraphQL.AST.Core
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( Alias
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, Arguments(..)
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, Directive(..)
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, Document
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, Field(..)
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, Fragment(..)
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, Name
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, Operation(..)
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, Selection(..)
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, TypeCondition
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, Value(..)
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) where
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import Data.Int (Int32)
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import Data.HashMap.Strict (HashMap)
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import Data.List.NonEmpty (NonEmpty)
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import Data.Sequence (Seq)
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import Data.String (IsString(..))
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import Data.Text (Text)
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import Language.GraphQL.AST (Alias, Name, TypeCondition)
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-- | GraphQL document is a non-empty list of operations.
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type Document = NonEmpty Operation
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-- | GraphQL has 3 operation types: queries, mutations and subscribtions.
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--
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-- Currently only queries and mutations are supported.
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data Operation
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= Query (Maybe Text) (Seq Selection)
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| Mutation (Maybe Text) (Seq Selection)
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deriving (Eq, Show)
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-- | Single GraphQL field.
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data Field
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= Field (Maybe Alias) Name Arguments (Seq Selection)
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deriving (Eq, Show)
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-- | Argument list.
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newtype Arguments = Arguments (HashMap Name Value)
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deriving (Eq, Show)
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instance Semigroup Arguments where
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(Arguments x) <> (Arguments y) = Arguments $ x <> y
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instance Monoid Arguments where
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mempty = Arguments mempty
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-- | Directive.
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data Directive = Directive Name Arguments
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deriving (Eq, Show)
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-- | Represents fragments and inline fragments.
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data Fragment
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= Fragment TypeCondition (Seq Selection)
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deriving (Eq, Show)
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-- | Single selection element.
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data Selection
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= SelectionFragment Fragment
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| SelectionField Field
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deriving (Eq, Show)
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-- | Represents accordingly typed GraphQL values.
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data Value
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= Int Int32
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| Float Double -- ^ GraphQL Float is double precision
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| String Text
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| Boolean Bool
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| Null
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| Enum Name
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| List [Value]
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| Object (HashMap Name Value)
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deriving (Eq, Show)
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instance IsString Value where
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fromString = String . fromString
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