type Argument struct {
	Name     string
	Value    *Value
	Position *Position `dump:"-"`
	Comment  *CommentGroup
}

type ArgumentDefinition struct {
	Description  string
	Name         string
	DefaultValue *Value
	Type         *Type
	Directives   DirectiveList
	Position     *Position `dump:"-"`

	BeforeDescriptionComment *CommentGroup
	AfterDescriptionComment  *CommentGroup
}

type ArgumentDefinitionList []*ArgumentDefinition

type ArgumentList []*Argument

type ChildValue struct {
	Name     string
	Value    *Value
	Position *Position `dump:"-"`
	Comment  *CommentGroup
}

type ChildValueList []*ChildValue

type Comment struct {
	Value    string
	Position *Position
}

type CommentGroup struct {
	List []*Comment
}

type Definition struct {
	Kind        DefinitionKind
	Description string
	Name        string
	Directives  DirectiveList
	Interfaces  []string      // object and input object
	Fields      FieldList     // object and input object
	Types       []string      // union
	EnumValues  EnumValueList // enum

	Position *Position `dump:"-"`
	BuiltIn  bool      `dump:"-"`

	BeforeDescriptionComment *CommentGroup
	AfterDescriptionComment  *CommentGroup
	EndOfDefinitionComment   *CommentGroup
}

type DefinitionKind string

const (
	Scalar      DefinitionKind = "SCALAR"
	Object      DefinitionKind = "OBJECT"
	Interface   DefinitionKind = "INTERFACE"
	Union       DefinitionKind = "UNION"
	Enum        DefinitionKind = "ENUM"
	InputObject DefinitionKind = "INPUT_OBJECT"
)

type DefinitionList []*Definition

type Directive struct {
	Name      string
	Arguments ArgumentList
	Position  *Position `dump:"-"`

	// Requires validation
	ParentDefinition *Definition
	Definition       *DirectiveDefinition
	Location         DirectiveLocation
}

type DirectiveDefinition struct {
	Description  string
	Name         string
	Arguments    ArgumentDefinitionList
	Locations    []DirectiveLocation
	IsRepeatable bool
	Position     *Position `dump:"-"`

	BeforeDescriptionComment *CommentGroup
	AfterDescriptionComment  *CommentGroup
}

type DirectiveDefinitionList []*DirectiveDefinition

type DirectiveList []*Directive

type DirectiveLocation string

const (
	// Executable
	LocationQuery              DirectiveLocation = `QUERY`
	LocationMutation           DirectiveLocation = `MUTATION`
	LocationSubscription       DirectiveLocation = `SUBSCRIPTION`
	LocationField              DirectiveLocation = `FIELD`
	LocationFragmentDefinition DirectiveLocation = `FRAGMENT_DEFINITION`
	LocationFragmentSpread     DirectiveLocation = `FRAGMENT_SPREAD`
	LocationInlineFragment     DirectiveLocation = `INLINE_FRAGMENT`

	// Type System
	LocationSchema               DirectiveLocation = `SCHEMA`
	LocationScalar               DirectiveLocation = `SCALAR`
	LocationObject               DirectiveLocation = `OBJECT`
	LocationFieldDefinition      DirectiveLocation = `FIELD_DEFINITION`
	LocationArgumentDefinition   DirectiveLocation = `ARGUMENT_DEFINITION`
	LocationInterface            DirectiveLocation = `INTERFACE`
	LocationUnion                DirectiveLocation = `UNION`
	LocationEnum                 DirectiveLocation = `ENUM`
	LocationEnumValue            DirectiveLocation = `ENUM_VALUE`
	LocationInputObject          DirectiveLocation = `INPUT_OBJECT`
	LocationInputFieldDefinition DirectiveLocation = `INPUT_FIELD_DEFINITION`
	LocationVariableDefinition   DirectiveLocation = `VARIABLE_DEFINITION`
)

type Dumpable interface {
	Dump() string
}

type EnumValueDefinition struct {
	Description string
	Name        string
	Directives  DirectiveList
	Position    *Position `dump:"-"`

	BeforeDescriptionComment *CommentGroup
	AfterDescriptionComment  *CommentGroup
}

type EnumValueList []*EnumValueDefinition

type Field struct {
	Alias        string
	Name         string
	Arguments    ArgumentList
	Directives   DirectiveList
	SelectionSet SelectionSet
	Position     *Position `dump:"-"`
	Comment      *CommentGroup

	// Require validation
	Definition       *FieldDefinition
	ObjectDefinition *Definition
}

type FieldDefinition struct {
	Description  string
	Name         string
	Arguments    ArgumentDefinitionList // only for objects
	DefaultValue *Value                 // only for input objects
	Type         *Type
	Directives   DirectiveList
	Position     *Position `dump:"-"`

	BeforeDescriptionComment *CommentGroup
	AfterDescriptionComment  *CommentGroup
}

type FieldList []*FieldDefinition

type FragmentDefinition struct {
	Name string
	// Note: fragment variable definitions are experimental and may be changed
	// or removed in the future.
	VariableDefinition VariableDefinitionList
	TypeCondition      string
	Directives         DirectiveList
	SelectionSet       SelectionSet

	// Require validation
	Definition *Definition

	Position *Position `dump:"-"`
	Comment  *CommentGroup
}

type FragmentDefinitionList []*FragmentDefinition

type FragmentSpread struct {
	Name       string
	Directives DirectiveList

	// Require validation
	ObjectDefinition *Definition
	Definition       *FragmentDefinition

	Position *Position `dump:"-"`
	Comment  *CommentGroup
}

type InlineFragment struct {
	TypeCondition string
	Directives    DirectiveList
	SelectionSet  SelectionSet

	// Require validation
	ObjectDefinition *Definition

	Position *Position `dump:"-"`
	Comment  *CommentGroup
}

type Operation string

const (
	Query        Operation = "query"
	Mutation     Operation = "mutation"
	Subscription Operation = "subscription"
)

type OperationDefinition struct {
	Operation           Operation
	Name                string
	VariableDefinitions VariableDefinitionList
	Directives          DirectiveList
	SelectionSet        SelectionSet
	Position            *Position `dump:"-"`
	Comment             *CommentGroup
}

type OperationList []*OperationDefinition

type OperationTypeDefinition struct {
	Operation Operation
	Type      string
	Position  *Position `dump:"-"`
	Comment   *CommentGroup
}

type OperationTypeDefinitionList []*OperationTypeDefinition

type Path []PathElement

type PathElement interface {
	// contains filtered or unexported methods
}

type PathIndex int

type PathName string

type Position struct {
	Start  int     // The starting position, in runes, of this token in the input.
	End    int     // The end position, in runes, of this token in the input.
	Line   int     // The line number at the start of this item.
	Column int     // The column number at the start of this item.
	Src    *Source // The source document this token belongs to
}

type QueryDocument struct {
	Operations OperationList
	Fragments  FragmentDefinitionList
	Position   *Position `dump:"-"`
	Comment    *CommentGroup
}

type Schema struct {
	Query            *Definition
	Mutation         *Definition
	Subscription     *Definition
	SchemaDirectives DirectiveList

	Types      map[string]*Definition
	Directives map[string]*DirectiveDefinition

	PossibleTypes map[string][]*Definition
	Implements    map[string][]*Definition

	Description string

	Comment *CommentGroup
}

type SchemaDefinition struct {
	Description    string
	Directives     DirectiveList
	OperationTypes OperationTypeDefinitionList
	Position       *Position `dump:"-"`

	BeforeDescriptionComment *CommentGroup
	AfterDescriptionComment  *CommentGroup
	EndOfDefinitionComment   *CommentGroup
}

type SchemaDefinitionList []*SchemaDefinition

type SchemaDocument struct {
	Schema          SchemaDefinitionList
	SchemaExtension SchemaDefinitionList
	Directives      DirectiveDefinitionList
	Definitions     DefinitionList
	Extensions      DefinitionList
	Position        *Position `dump:"-"`
	Comment         *CommentGroup
}

type Selection interface {
	GetPosition() *Position
	// contains filtered or unexported methods
}

type SelectionSet []Selection

type Source struct {
	// Name is the filename of the source
	Name string
	// Input is the actual contents of the source file
	Input string
	// BuiltIn indicate whether the source is a part of the specification
	BuiltIn bool
}

type Type struct {
	NamedType string
	Elem      *Type
	NonNull   bool
	Position  *Position `dump:"-"`
}

type Value struct {
	Raw      string
	Children ChildValueList
	Kind     ValueKind
	Position *Position `dump:"-"`
	Comment  *CommentGroup

	// Require validation
	Definition         *Definition
	VariableDefinition *VariableDefinition
	ExpectedType       *Type
}

type ValueKind int

const (
	Variable ValueKind = iota
	IntValue
	FloatValue
	StringValue
	BlockValue
	BooleanValue
	NullValue
	EnumValue
	ListValue
	ObjectValue
)

type VariableDefinition struct {
	Variable     string
	Type         *Type
	DefaultValue *Value
	Directives   DirectiveList
	Position     *Position `dump:"-"`
	Comment      *CommentGroup

	// Requires validation
	Definition *Definition
	Used       bool `dump:"-"`
}

type VariableDefinitionList []*VariableDefinition