graphql: update gqlgen to 0.5.1

fix #6

12 files changed, 841 insertions, 0 deletions

diff --git a/vendor/github.com/vektah/gqlparser/ast/argmap.go b/vendor/github.com/vektah/gqlparser/ast/argmap.go
new file mode 100644
index 00000000..43f6a3d6
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/argmap.go
@@ -0,0 +1,37 @@
+package ast
+
+func arg2map(defs ArgumentDefinitionList, args ArgumentList, vars map[string]interface{}) map[string]interface{} {
+	result := map[string]interface{}{}
+	var err error
+
+	for _, argDef := range defs {
+		var val interface{}
+		var hasValue bool
+
+		if argValue := args.ForName(argDef.Name); argValue != nil {
+			if argValue.Value.Kind == Variable {
+				val, hasValue = vars[argValue.Value.Raw]
+			} else {
+				val, err = argValue.Value.Value(vars)
+				if err != nil {
+					panic(err)
+				}
+				hasValue = true
+			}
+		}
+
+		if !hasValue && argDef.DefaultValue != nil {
+			val, err = argDef.DefaultValue.Value(vars)
+			if err != nil {
+				panic(err)
+			}
+			hasValue = true
+		}
+
+		if hasValue {
+			result[argDef.Name] = val
+		}
+	}
+
+	return result
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/collections.go b/vendor/github.com/vektah/gqlparser/ast/collections.go
new file mode 100644
index 00000000..6bf67297
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/collections.go
@@ -0,0 +1,138 @@
+package ast
+
+type FieldList []*FieldDefinition
+
+func (l FieldList) ForName(name string) *FieldDefinition {
+	for _, it := range l {
+		if it.Name == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type EnumValueList []*EnumValueDefinition
+
+func (l EnumValueList) ForName(name string) *EnumValueDefinition {
+	for _, it := range l {
+		if it.Name == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type DirectiveList []*Directive
+
+func (l DirectiveList) ForName(name string) *Directive {
+	for _, it := range l {
+		if it.Name == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type OperationList []*OperationDefinition
+
+func (l OperationList) ForName(name string) *OperationDefinition {
+	if name == "" && len(l) == 1 {
+		return l[0]
+	}
+	for _, it := range l {
+		if it.Name == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type FragmentDefinitionList []*FragmentDefinition
+
+func (l FragmentDefinitionList) ForName(name string) *FragmentDefinition {
+	for _, it := range l {
+		if it.Name == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type VariableDefinitionList []*VariableDefinition
+
+func (l VariableDefinitionList) ForName(name string) *VariableDefinition {
+	for _, it := range l {
+		if it.Variable == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type ArgumentList []*Argument
+
+func (l ArgumentList) ForName(name string) *Argument {
+	for _, it := range l {
+		if it.Name == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type ArgumentDefinitionList []*ArgumentDefinition
+
+func (l ArgumentDefinitionList) ForName(name string) *ArgumentDefinition {
+	for _, it := range l {
+		if it.Name == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type SchemaDefinitionList []*SchemaDefinition
+
+type DirectiveDefinitionList []*DirectiveDefinition
+
+func (l DirectiveDefinitionList) ForName(name string) *DirectiveDefinition {
+	for _, it := range l {
+		if it.Name == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type DefinitionList []*Definition
+
+func (l DefinitionList) ForName(name string) *Definition {
+	for _, it := range l {
+		if it.Name == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type OperationTypeDefinitionList []*OperationTypeDefinition
+
+func (l OperationTypeDefinitionList) ForType(name string) *OperationTypeDefinition {
+	for _, it := range l {
+		if it.Type == name {
+			return it
+		}
+	}
+	return nil
+}
+
+type ChildValueList []*ChildValue
+
+func (v ChildValueList) ForName(name string) *Value {
+	for _, f := range v {
+		if f.Name == name {
+			return f.Value
+		}
+	}
+	return nil
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/definition.go b/vendor/github.com/vektah/gqlparser/ast/definition.go
new file mode 100644
index 00000000..74f4ece5
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/definition.go
@@ -0,0 +1,92 @@
+package ast
+
+type DefinitionKind string
+
+const (
+	Scalar      DefinitionKind = "SCALAR"
+	Object      DefinitionKind = "OBJECT"
+	Interface   DefinitionKind = "INTERFACE"
+	Union       DefinitionKind = "UNION"
+	Enum        DefinitionKind = "ENUM"
+	InputObject DefinitionKind = "INPUT_OBJECT"
+)
+
+// ObjectDefinition is the core type definition object, it includes all of the definable types
+// but does *not* cover schema or directives.
+//
+// @vektah: Javascript implementation has different types for all of these, but they are
+// more similar than different and don't define any behaviour. I think this style of
+// "some hot" struct works better, at least for go.
+//
+// Type extensions are also represented by this same struct.
+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:"-"`
+}
+
+func (d *Definition) IsLeafType() bool {
+	return d.Kind == Enum || d.Kind == Scalar
+}
+
+func (d *Definition) IsAbstractType() bool {
+	return d.Kind == Interface || d.Kind == Union
+}
+
+func (d *Definition) IsCompositeType() bool {
+	return d.Kind == Object || d.Kind == Interface || d.Kind == Union
+}
+
+func (d *Definition) IsInputType() bool {
+	return d.Kind == Scalar || d.Kind == Enum || d.Kind == InputObject
+}
+
+func (d *Definition) OneOf(types ...string) bool {
+	for _, t := range types {
+		if d.Name == t {
+			return true
+		}
+	}
+	return false
+}
+
+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:"-"`
+}
+
+type ArgumentDefinition struct {
+	Description  string
+	Name         string
+	DefaultValue *Value
+	Type         *Type
+	Directives   DirectiveList
+	Position     *Position `dump:"-"`
+}
+
+type EnumValueDefinition struct {
+	Description string
+	Name        string
+	Directives  DirectiveList
+	Position    *Position `dump:"-"`
+}
+
+type DirectiveDefinition struct {
+	Description string
+	Name        string
+	Arguments   ArgumentDefinitionList
+	Locations   []DirectiveLocation
+	Position    *Position `dump:"-"`
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/directive.go b/vendor/github.com/vektah/gqlparser/ast/directive.go
new file mode 100644
index 00000000..9b07c92a
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/directive.go
@@ -0,0 +1,42 @@
+package ast
+
+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`
+)
+
+type Directive struct {
+	Name      string
+	Arguments ArgumentList
+	Position  *Position `dump:"-"`
+
+	// Requires validation
+	ParentDefinition *Definition
+	Definition       *DirectiveDefinition
+	Location         DirectiveLocation
+}
+
+func (d *Directive) ArgumentMap(vars map[string]interface{}) map[string]interface{} {
+	return arg2map(d.Definition.Arguments, d.Arguments, vars)
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/document.go b/vendor/github.com/vektah/gqlparser/ast/document.go
new file mode 100644
index 00000000..b7657d62
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/document.go
@@ -0,0 +1,65 @@
+package ast
+
+type QueryDocument struct {
+	Operations OperationList
+	Fragments  FragmentDefinitionList
+	Position   *Position `dump:"-"`
+}
+
+type SchemaDocument struct {
+	Schema          SchemaDefinitionList
+	SchemaExtension SchemaDefinitionList
+	Directives      DirectiveDefinitionList
+	Definitions     DefinitionList
+	Extensions      DefinitionList
+	Position        *Position `dump:"-"`
+}
+
+func (d *SchemaDocument) Merge(other *SchemaDocument) {
+	d.Schema = append(d.Schema, other.Schema...)
+	d.SchemaExtension = append(d.SchemaExtension, other.SchemaExtension...)
+	d.Directives = append(d.Directives, other.Directives...)
+	d.Definitions = append(d.Definitions, other.Definitions...)
+	d.Extensions = append(d.Extensions, other.Extensions...)
+}
+
+type Schema struct {
+	Query        *Definition
+	Mutation     *Definition
+	Subscription *Definition
+
+	Types      map[string]*Definition
+	Directives map[string]*DirectiveDefinition
+
+	PossibleTypes map[string][]*Definition
+}
+
+func (s *Schema) AddPossibleType(name string, def *Definition) {
+	s.PossibleTypes[name] = append(s.PossibleTypes[name], def)
+}
+
+// GetPossibleTypes will enumerate all the definitions for a given interface or union
+func (s *Schema) GetPossibleTypes(def *Definition) []*Definition {
+	if def.Kind == Union {
+		var defs []*Definition
+		for _, t := range def.Types {
+			defs = append(defs, s.Types[t])
+		}
+		return defs
+	}
+
+	return s.PossibleTypes[def.Name]
+}
+
+type SchemaDefinition struct {
+	Description    string
+	Directives     DirectiveList
+	OperationTypes OperationTypeDefinitionList
+	Position       *Position `dump:"-"`
+}
+
+type OperationTypeDefinition struct {
+	Operation Operation
+	Type      string
+	Position  *Position `dump:"-"`
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/dumper.go b/vendor/github.com/vektah/gqlparser/ast/dumper.go
new file mode 100644
index 00000000..dbb7a7ef
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/dumper.go
@@ -0,0 +1,159 @@
+package ast
+
+import (
+	"bytes"
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+// Dump turns ast into a stable string format for assertions in tests
+func Dump(i interface{}) string {
+	v := reflect.ValueOf(i)
+
+	d := dumper{Buffer: &bytes.Buffer{}}
+	d.dump(v)
+
+	return d.String()
+}
+
+type dumper struct {
+	*bytes.Buffer
+	indent int
+}
+
+type Dumpable interface {
+	Dump() string
+}
+
+func (d *dumper) dump(v reflect.Value) {
+	if dumpable, isDumpable := v.Interface().(Dumpable); isDumpable {
+		d.WriteString(dumpable.Dump())
+		return
+	}
+	switch v.Kind() {
+	case reflect.Bool:
+		if v.Bool() {
+			d.WriteString("true")
+		} else {
+			d.WriteString("false")
+		}
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		d.WriteString(fmt.Sprintf("%d", v.Int()))
+
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		d.WriteString(fmt.Sprintf("%d", v.Uint()))
+
+	case reflect.Float32, reflect.Float64:
+		d.WriteString(fmt.Sprintf("%.2f", v.Float()))
+
+	case reflect.String:
+		if v.Type().Name() != "string" {
+			d.WriteString(v.Type().Name() + "(" + strconv.Quote(v.String()) + ")")
+		} else {
+			d.WriteString(strconv.Quote(v.String()))
+		}
+
+	case reflect.Array, reflect.Slice:
+		d.dumpArray(v)
+
+	case reflect.Interface, reflect.Ptr:
+		d.dumpPtr(v)
+
+	case reflect.Struct:
+		d.dumpStruct(v)
+
+	default:
+		panic(fmt.Errorf("unsupported kind: %s\n buf: %s", v.Kind().String(), d.String()))
+	}
+}
+
+func (d *dumper) writeIndent() {
+	d.Buffer.WriteString(strings.Repeat("  ", d.indent))
+}
+
+func (d *dumper) nl() {
+	d.Buffer.WriteByte('\n')
+	d.writeIndent()
+}
+
+func typeName(t reflect.Type) string {
+	if t.Kind() == reflect.Ptr {
+		return typeName(t.Elem())
+	}
+	return t.Name()
+}
+
+func (d *dumper) dumpArray(v reflect.Value) {
+	d.WriteString("[" + typeName(v.Type().Elem()) + "]")
+
+	for i := 0; i < v.Len(); i++ {
+		d.nl()
+		d.WriteString("- ")
+		d.indent++
+		d.dump(v.Index(i))
+		d.indent--
+	}
+}
+
+func (d *dumper) dumpStruct(v reflect.Value) {
+	d.WriteString("<" + v.Type().Name() + ">")
+	d.indent++
+
+	typ := v.Type()
+	for i := 0; i < v.NumField(); i++ {
+		f := v.Field(i)
+		if typ.Field(i).Tag.Get("dump") == "-" {
+			continue
+		}
+
+		if isZero(f) {
+			continue
+		}
+		d.nl()
+		d.WriteString(typ.Field(i).Name)
+		d.WriteString(": ")
+		d.dump(v.Field(i))
+	}
+
+	d.indent--
+}
+
+func isZero(v reflect.Value) bool {
+	switch v.Kind() {
+	case reflect.Ptr, reflect.Interface:
+		return v.IsNil()
+	case reflect.Func, reflect.Map:
+		return v.IsNil()
+
+	case reflect.Array, reflect.Slice:
+		if v.IsNil() {
+			return true
+		}
+		z := true
+		for i := 0; i < v.Len(); i++ {
+			z = z && isZero(v.Index(i))
+		}
+		return z
+	case reflect.Struct:
+		z := true
+		for i := 0; i < v.NumField(); i++ {
+			z = z && isZero(v.Field(i))
+		}
+		return z
+	case reflect.String:
+		return v.String() == ""
+	}
+
+	// Compare other types directly:
+	return reflect.DeepEqual(v.Interface(), reflect.Zero(v.Type()))
+}
+
+func (d *dumper) dumpPtr(v reflect.Value) {
+	if v.IsNil() {
+		d.WriteString("nil")
+		return
+	}
+	d.dump(v.Elem())
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/fragment.go b/vendor/github.com/vektah/gqlparser/ast/fragment.go
new file mode 100644
index 00000000..57ab56c7
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/fragment.go
@@ -0,0 +1,38 @@
+package ast
+
+type FragmentSpread struct {
+	Name       string
+	Directives DirectiveList
+
+	// Require validation
+	ObjectDefinition *Definition
+	Definition       *FragmentDefinition
+
+	Position *Position `dump:"-"`
+}
+
+type InlineFragment struct {
+	TypeCondition string
+	Directives    DirectiveList
+	SelectionSet  SelectionSet
+
+	// Require validation
+	ObjectDefinition *Definition
+
+	Position *Position `dump:"-"`
+}
+
+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:"-"`
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/operation.go b/vendor/github.com/vektah/gqlparser/ast/operation.go
new file mode 100644
index 00000000..03e916a0
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/operation.go
@@ -0,0 +1,29 @@
+package ast
+
+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:"-"`
+}
+
+type VariableDefinition struct {
+	Variable     string
+	Type         *Type
+	DefaultValue *Value
+	Position     *Position `dump:"-"`
+
+	// Requires validation
+	Definition *Definition
+	Used       bool `dump:"-"`
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/selection.go b/vendor/github.com/vektah/gqlparser/ast/selection.go
new file mode 100644
index 00000000..159db844
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/selection.go
@@ -0,0 +1,39 @@
+package ast
+
+type SelectionSet []Selection
+
+type Selection interface {
+	isSelection()
+	GetPosition() *Position
+}
+
+func (*Field) isSelection()          {}
+func (*FragmentSpread) isSelection() {}
+func (*InlineFragment) isSelection() {}
+
+func (s *Field) GetPosition() *Position          { return s.Position }
+func (s *FragmentSpread) GetPosition() *Position { return s.Position }
+func (s *InlineFragment) GetPosition() *Position { return s.Position }
+
+type Field struct {
+	Alias        string
+	Name         string
+	Arguments    ArgumentList
+	Directives   DirectiveList
+	SelectionSet SelectionSet
+	Position     *Position `dump:"-"`
+
+	// Require validation
+	Definition       *FieldDefinition
+	ObjectDefinition *Definition
+}
+
+type Argument struct {
+	Name     string
+	Value    *Value
+	Position *Position `dump:"-"`
+}
+
+func (f *Field) ArgumentMap(vars map[string]interface{}) map[string]interface{} {
+	return arg2map(f.Definition.Arguments, f.Arguments, vars)
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/source.go b/vendor/github.com/vektah/gqlparser/ast/source.go
new file mode 100644
index 00000000..9d44dd9c
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/source.go
@@ -0,0 +1,14 @@
+package ast
+
+type Source struct {
+	Name  string
+	Input 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 line number at the start of this item.
+	Src    *Source // The source document this token belongs to
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/type.go b/vendor/github.com/vektah/gqlparser/ast/type.go
new file mode 100644
index 00000000..9577fdb4
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/type.go
@@ -0,0 +1,68 @@
+package ast
+
+func NonNullNamedType(named string, pos *Position) *Type {
+	return &Type{NamedType: named, NonNull: true, Position: pos}
+}
+
+func NamedType(named string, pos *Position) *Type {
+	return &Type{NamedType: named, NonNull: false, Position: pos}
+}
+
+func NonNullListType(elem *Type, pos *Position) *Type {
+	return &Type{Elem: elem, NonNull: true, Position: pos}
+}
+
+func ListType(elem *Type, pos *Position) *Type {
+	return &Type{Elem: elem, NonNull: false, Position: pos}
+}
+
+type Type struct {
+	NamedType string
+	Elem      *Type
+	NonNull   bool
+	Position  *Position `dump:"-"`
+}
+
+func (t *Type) Name() string {
+	if t.NamedType != "" {
+		return t.NamedType
+	}
+
+	return t.Elem.Name()
+}
+
+func (t *Type) String() string {
+	nn := ""
+	if t.NonNull {
+		nn = "!"
+	}
+	if t.NamedType != "" {
+		return t.NamedType + nn
+	}
+
+	return "[" + t.Elem.String() + "]" + nn
+}
+
+func (t *Type) IsCompatible(other *Type) bool {
+	if t.NamedType != other.NamedType {
+		return false
+	}
+
+	if t.Elem != nil && other.Elem == nil {
+		return false
+	}
+
+	if t.Elem != nil && !t.Elem.IsCompatible(other.Elem) {
+		return false
+	}
+
+	if other.NonNull {
+		return t.NonNull
+	}
+
+	return true
+}
+
+func (v *Type) Dump() string {
+	return v.String()
+}
diff --git a/vendor/github.com/vektah/gqlparser/ast/value.go b/vendor/github.com/vektah/gqlparser/ast/value.go
new file mode 100644
index 00000000..3168b266
--- /dev/null
+++ b/vendor/github.com/vektah/gqlparser/ast/value.go
@@ -0,0 +1,120 @@
+package ast
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type ValueKind int
+
+const (
+	Variable ValueKind = iota
+	IntValue
+	FloatValue
+	StringValue
+	BlockValue
+	BooleanValue
+	NullValue
+	EnumValue
+	ListValue
+	ObjectValue
+)
+
+type Value struct {
+	Raw      string
+	Children ChildValueList
+	Kind     ValueKind
+	Position *Position `dump:"-"`
+
+	// Require validation
+	Definition         *Definition
+	VariableDefinition *VariableDefinition
+	ExpectedType       *Type
+}
+
+type ChildValue struct {
+	Name     string
+	Value    *Value
+	Position *Position `dump:"-"`
+}
+
+func (v *Value) Value(vars map[string]interface{}) (interface{}, error) {
+	if v == nil {
+		return nil, nil
+	}
+	switch v.Kind {
+	case Variable:
+		if value, ok := vars[v.Raw]; ok {
+			return value, nil
+		}
+		if v.VariableDefinition != nil && v.VariableDefinition.DefaultValue != nil {
+			return v.VariableDefinition.DefaultValue.Value(vars)
+		}
+		return nil, nil
+	case IntValue:
+		return strconv.ParseInt(v.Raw, 10, 64)
+	case FloatValue:
+		return strconv.ParseFloat(v.Raw, 64)
+	case StringValue, BlockValue, EnumValue:
+		return v.Raw, nil
+	case BooleanValue:
+		return strconv.ParseBool(v.Raw)
+	case NullValue:
+		return nil, nil
+	case ListValue:
+		var val []interface{}
+		for _, elem := range v.Children {
+			elemVal, err := elem.Value.Value(vars)
+			if err != nil {
+				return val, err
+			}
+			val = append(val, elemVal)
+		}
+		return val, nil
+	case ObjectValue:
+		val := map[string]interface{}{}
+		for _, elem := range v.Children {
+			elemVal, err := elem.Value.Value(vars)
+			if err != nil {
+				return val, err
+			}
+			val[elem.Name] = elemVal
+		}
+		return val, nil
+	default:
+		panic(fmt.Errorf("unknown value kind %d", v.Kind))
+	}
+}
+
+func (v *Value) String() string {
+	if v == nil {
+		return "<nil>"
+	}
+	switch v.Kind {
+	case Variable:
+		return "$" + v.Raw
+	case IntValue, FloatValue, EnumValue, BooleanValue, NullValue:
+		return v.Raw
+	case StringValue, BlockValue:
+		return strconv.Quote(v.Raw)
+	case ListValue:
+		var val []string
+		for _, elem := range v.Children {
+			val = append(val, elem.Value.String())
+		}
+		return "[" + strings.Join(val, ",") + "]"
+	case ObjectValue:
+		var val []string
+		for _, elem := range v.Children {
+			val = append(val, strconv.Quote(elem.Name)+":"+elem.Value.String())
+		}
+		return "{" + strings.Join(val, ",") + "}"
+	default:
+		panic(fmt.Errorf("unknown value kind %d", v.Kind))
+	}
+}
+
+func (v *Value) Dump() string {
+	return v.String()
+}