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|
-- | This module defines an abstract syntax tree for the @GraphQL@ language based on
-- <https://facebook.github.io/graphql/ Facebook's GraphQL Specification>.
--
-- Target AST for Parser.
module Data.GraphQL.AST where
import Data.Int (Int32)
import Data.List.NonEmpty (NonEmpty)
import Data.Text (Text)
-- * Name
type Name = Text
-- * Document
type Document = NonEmpty Definition
-- * Operations
data Definition = DefinitionOperation OperationDefinition
| DefinitionFragment FragmentDefinition
deriving (Eq,Show)
data OperationDefinition = OperationSelectionSet SelectionSet
| OperationDefinition OperationType
(Maybe Name)
VariableDefinitions
Directives
SelectionSet
deriving (Eq,Show)
data OperationType = Query | Mutation deriving (Eq,Show)
-- * SelectionSet
type SelectionSet = NonEmpty Selection
type SelectionSetOpt = [Selection]
data Selection = SelectionField Field
| SelectionFragmentSpread FragmentSpread
| SelectionInlineFragment InlineFragment
deriving (Eq,Show)
-- * Field
data Field = Field (Maybe Alias) Name Arguments Directives SelectionSetOpt
deriving (Eq,Show)
type Alias = Name
-- * Arguments
type Arguments = [Argument]
data Argument = Argument Name Value deriving (Eq,Show)
-- * Fragments
data FragmentSpread = FragmentSpread Name Directives deriving (Eq,Show)
data InlineFragment = InlineFragment (Maybe TypeCondition) Directives SelectionSet
deriving (Eq,Show)
data FragmentDefinition =
FragmentDefinition FragmentName TypeCondition Directives SelectionSet
deriving (Eq,Show)
type FragmentName = Name
type TypeCondition = Name
-- Input Values
data Value = ValueVariable Variable
| ValueInt IntValue
| ValueFloat FloatValue
| ValueString StringValue
| ValueBoolean BooleanValue
| ValueNull
| ValueEnum EnumValue
| ValueList ListValue
| ValueObject ObjectValue
deriving (Eq,Show)
type IntValue = Int32
-- GraphQL Float is double precison
type FloatValue = Double
type StringValue = Text
type BooleanValue = Bool
type EnumValue = Name
type ListValue = [Value]
type ObjectValue = [ObjectField]
data ObjectField = ObjectField Name Value deriving (Eq,Show)
-- * Variables
type VariableDefinitions = [VariableDefinition]
data VariableDefinition = VariableDefinition Variable Type (Maybe DefaultValue)
deriving (Eq,Show)
type Variable = Name
type DefaultValue = Value
-- * Input Types
data Type = TypeNamed Name
| TypeList Type
| TypeNonNull NonNullType
deriving (Eq,Show)
data NonNullType = NonNullTypeNamed Name
| NonNullTypeList Type
deriving (Eq,Show)
-- * Directives
type Directives = [Directive]
data Directive = Directive Name [Argument] deriving (Eq,Show)
|
