add attributes fiald to all nodes

dumper.go

@@ -13,7 +13,7 @@ type dumper struct {
 func (d dumper) EnterNode(n node.Node) bool {
 
 	fmt.Printf("%v%v", d.indent, n.Name())
-	if a := n.Attributes(); a != nil {
+	if a := n.Attributes(); len(a) > 0 {
 		fmt.Printf(" %v", a)
 	}
 	fmt.Println()

node/expr/array.go

@@ -5,13 +5,15 @@ import (
 )
 
 type Array struct {
-	name  string
-	items []node.Node
+	name       string
+	attributes map[string]interface{}
+	items      []node.Node
 }
 
 func NewArray(items []node.Node) node.Node {
 	return Array{
 		"Array",
+		map[string]interface{}{},
 		items,
 	}
 }
@@ -21,7 +23,7 @@ func (n Array) Name() string {
 }
 
 func (n Array) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Array) Walk(v node.Visitor) {

node/expr/array_dim_fetch.go

@@ -5,14 +5,16 @@ import (
 )
 
 type ArrayDimFetch struct {
-	name     string
-	variable node.Node
-	dim      node.Node
+	name       string
+	attributes map[string]interface{}
+	variable   node.Node
+	dim        node.Node
 }
 
 func NewArrayDimFetch(variable node.Node, dim node.Node) node.Node {
 	return ArrayDimFetch{
 		"ArrayDimFetch",
+		map[string]interface{}{},
 		variable,
 		dim,
 	}
@@ -23,7 +25,7 @@ func (n ArrayDimFetch) Name() string {
 }
 
 func (n ArrayDimFetch) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ArrayDimFetch) Walk(v node.Visitor) {

node/expr/array_item.go

@@ -27,7 +27,7 @@ func (n ArrayItem) Name() string {
 }
 
 func (n ArrayItem) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ArrayItem) Walk(v node.Visitor) {

node/expr/assign_op/assign.go

@@ -12,6 +12,7 @@ func NewAssign(variable node.Node, expression node.Node) node.Node {
 	return Assign{
 		AssignOp{
 			"Assign",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Assign) Name() string {
 }
 
 func (n Assign) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Assign) Walk(v node.Visitor) {

node/expr/assign_op/assign_op.go

@@ -6,6 +6,7 @@ import (
 
 type AssignOp struct {
 	name       string
+	attributes map[string]interface{}
 	variable   node.Node
 	expression node.Node
 }

node/expr/assign_op/assign_ref.go

@@ -12,6 +12,7 @@ func NewAssignRef(variable node.Node, expression node.Node) node.Node {
 	return AssignRef{
 		AssignOp{
 			"AssignRef",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n AssignRef) Name() string {
 }
 
 func (n AssignRef) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n AssignRef) Walk(v node.Visitor) {

node/expr/assign_op/bitwise_and.go

@@ -12,6 +12,7 @@ func NewBitwiseAnd(variable node.Node, expression node.Node) node.Node {
 	return BitwiseAnd{
 		AssignOp{
 			"AssignBitwiseAnd",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n BitwiseAnd) Name() string {
 }
 
 func (n BitwiseAnd) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n BitwiseAnd) Walk(v node.Visitor) {

node/expr/assign_op/bitwise_or.go

@@ -12,6 +12,7 @@ func NewBitwiseOr(variable node.Node, expression node.Node) node.Node {
 	return BitwiseOr{
 		AssignOp{
 			"AssignBitwiseOr",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n BitwiseOr) Name() string {
 }
 
 func (n BitwiseOr) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n BitwiseOr) Walk(v node.Visitor) {

node/expr/assign_op/bitwise_xor.go

@@ -12,6 +12,7 @@ func NewBitwiseXor(variable node.Node, expression node.Node) node.Node {
 	return BitwiseXor{
 		AssignOp{
 			"AssignBitwiseXor",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -19,7 +20,7 @@ func NewBitwiseXor(variable node.Node, expression node.Node) node.Node {
 }
 
 func (n BitwiseXor) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n BitwiseXor) Name() string {

node/expr/assign_op/concat.go

@@ -12,6 +12,7 @@ func NewConcat(variable node.Node, expression node.Node) node.Node {
 	return Concat{
 		AssignOp{
 			"AssignConcat",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Concat) Name() string {
 }
 
 func (n Concat) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Concat) Walk(v node.Visitor) {

node/expr/assign_op/div.go

@@ -12,6 +12,7 @@ func NewDiv(variable node.Node, expression node.Node) node.Node {
 	return Div{
 		AssignOp{
 			"AssignDiv",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Div) Name() string {
 }
 
 func (n Div) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Div) Walk(v node.Visitor) {

node/expr/assign_op/minus.go

@@ -12,6 +12,7 @@ func NewMinus(variable node.Node, expression node.Node) node.Node {
 	return Minus{
 		AssignOp{
 			"AssignMinus",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Minus) Name() string {
 }
 
 func (n Minus) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Minus) Walk(v node.Visitor) {

node/expr/assign_op/mod.go

@@ -12,6 +12,7 @@ func NewMod(variable node.Node, expression node.Node) node.Node {
 	return Mod{
 		AssignOp{
 			"AssignMod",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Mod) Name() string {
 }
 
 func (n Mod) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Mod) Walk(v node.Visitor) {

node/expr/assign_op/mul.go

@@ -12,6 +12,7 @@ func NewMul(variable node.Node, expression node.Node) node.Node {
 	return Mul{
 		AssignOp{
 			"AssignMul",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Mul) Name() string {
 }
 
 func (n Mul) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Mul) Walk(v node.Visitor) {

node/expr/assign_op/plus.go

@@ -12,6 +12,7 @@ func NewPlus(variable node.Node, expression node.Node) node.Node {
 	return Plus{
 		AssignOp{
 			"AssignPlus",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Plus) Name() string {
 }
 
 func (n Plus) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Plus) Walk(v node.Visitor) {

node/expr/assign_op/pow.go

@@ -12,6 +12,7 @@ func NewPow(variable node.Node, expression node.Node) node.Node {
 	return Pow{
 		AssignOp{
 			"AssignPow",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Pow) Name() string {
 }
 
 func (n Pow) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Pow) Walk(v node.Visitor) {

node/expr/assign_op/shift_left.go

@@ -12,6 +12,7 @@ func NewShiftLeft(variable node.Node, expression node.Node) node.Node {
 	return ShiftLeft{
 		AssignOp{
 			"AssignShiftLeft",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n ShiftLeft) Name() string {
 }
 
 func (n ShiftLeft) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ShiftLeft) Walk(v node.Visitor) {

node/expr/assign_op/shift_right.go

@@ -12,6 +12,7 @@ func NewShiftRight(variable node.Node, expression node.Node) node.Node {
 	return ShiftRight{
 		AssignOp{
 			"AssignShiftRight",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n ShiftRight) Name() string {
 }
 
 func (n ShiftRight) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ShiftRight) Walk(v node.Visitor) {

node/expr/binary_op/binary_op.go

@@ -5,7 +5,8 @@ import (
 )
 
 type BinaryOp struct {
-	name  string
-	left  node.Node
-	right node.Node
+	name       string
+	attributes map[string]interface{}
+	left       node.Node
+	right      node.Node
 }

node/expr/binary_op/bitwise_and.go

@@ -12,6 +12,7 @@ func NewBitwiseAnd(variable node.Node, expression node.Node) node.Node {
 	return BitwiseAnd{
 		BinaryOp{
 			"BinaryBitwiseAnd",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n BitwiseAnd) Name() string {
 }
 
 func (n BitwiseAnd) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n BitwiseAnd) Walk(v node.Visitor) {

node/expr/binary_op/bitwise_or.go

@@ -12,6 +12,7 @@ func NewBitwiseOr(variable node.Node, expression node.Node) node.Node {
 	return BitwiseOr{
 		BinaryOp{
 			"BinaryBitwiseOr",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -19,7 +20,7 @@ func NewBitwiseOr(variable node.Node, expression node.Node) node.Node {
 }
 
 func (n BitwiseOr) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n BitwiseOr) Name() string {

node/expr/binary_op/bitwise_xor.go

@@ -12,6 +12,7 @@ func NewBitwiseXor(variable node.Node, expression node.Node) node.Node {
 	return BitwiseXor{
 		BinaryOp{
 			"BinaryBitwiseXor",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -19,7 +20,7 @@ func NewBitwiseXor(variable node.Node, expression node.Node) node.Node {
 }
 
 func (n BitwiseXor) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n BitwiseXor) Name() string {

node/expr/binary_op/boolean_and.go

@@ -12,6 +12,7 @@ func NewBooleanAnd(variable node.Node, expression node.Node) node.Node {
 	return BooleanAnd{
 		BinaryOp{
 			"BinaryBooleanAnd",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n BooleanAnd) Name() string {
 }
 
 func (n BooleanAnd) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n BooleanAnd) Walk(v node.Visitor) {

node/expr/binary_op/boolean_or.go

@@ -12,6 +12,7 @@ func NewBooleanOr(variable node.Node, expression node.Node) node.Node {
 	return BooleanOr{
 		BinaryOp{
 			"BinaryBooleanOr",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n BooleanOr) Name() string {
 }
 
 func (n BooleanOr) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n BooleanOr) Walk(v node.Visitor) {

node/expr/binary_op/coalesce.go

@@ -12,6 +12,7 @@ func NewCoalesce(variable node.Node, expression node.Node) node.Node {
 	return Coalesce{
 		BinaryOp{
 			"BinaryCoalesce",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Coalesce) Name() string {
 }
 
 func (n Coalesce) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Coalesce) Walk(v node.Visitor) {

node/expr/binary_op/concat.go

@@ -12,6 +12,7 @@ func NewConcat(variable node.Node, expression node.Node) node.Node {
 	return Concat{
 		BinaryOp{
 			"BinaryConcat",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Concat) Name() string {
 }
 
 func (n Concat) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Concat) Walk(v node.Visitor) {

node/expr/binary_op/div.go

@@ -12,6 +12,7 @@ func NewDiv(variable node.Node, expression node.Node) node.Node {
 	return Div{
 		BinaryOp{
 			"BinaryDiv",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Div) Name() string {
 }
 
 func (n Div) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Div) Walk(v node.Visitor) {

node/expr/binary_op/equal.go

@@ -12,6 +12,7 @@ func NewEqual(variable node.Node, expression node.Node) node.Node {
 	return Equal{
 		BinaryOp{
 			"BinaryEqual",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Equal) Name() string {
 }
 
 func (n Equal) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Equal) Walk(v node.Visitor) {

node/expr/binary_op/greater.go

@@ -12,6 +12,7 @@ func NewGreater(variable node.Node, expression node.Node) node.Node {
 	return Greater{
 		BinaryOp{
 			"BinaryGreater",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Greater) Name() string {
 }
 
 func (n Greater) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Greater) Walk(v node.Visitor) {

node/expr/binary_op/greater_or_equal.go

@@ -12,6 +12,7 @@ func NewGreaterOrEqual(variable node.Node, expression node.Node) node.Node {
 	return GreaterOrEqual{
 		BinaryOp{
 			"BinaryGreaterOrEqual",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n GreaterOrEqual) Name() string {
 }
 
 func (n GreaterOrEqual) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n GreaterOrEqual) Walk(v node.Visitor) {

node/expr/binary_op/identical.go

@@ -12,6 +12,7 @@ func NewIdentical(variable node.Node, expression node.Node) node.Node {
 	return Identical{
 		BinaryOp{
 			"BinaryIdentical",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Identical) Name() string {
 }
 
 func (n Identical) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Identical) Walk(v node.Visitor) {

node/expr/binary_op/logical_and.go

@@ -12,6 +12,7 @@ func NewLogicalAnd(variable node.Node, expression node.Node) node.Node {
 	return LogicalAnd{
 		BinaryOp{
 			"BinaryLogicalAnd",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n LogicalAnd) Name() string {
 }
 
 func (n LogicalAnd) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n LogicalAnd) Walk(v node.Visitor) {

node/expr/binary_op/logical_or.go

@@ -12,6 +12,7 @@ func NewLogicalOr(variable node.Node, expression node.Node) node.Node {
 	return LogicalOr{
 		BinaryOp{
 			"BinaryLogicalOr",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n LogicalOr) Name() string {
 }
 
 func (n LogicalOr) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n LogicalOr) Walk(v node.Visitor) {

node/expr/binary_op/logical_xor.go

@@ -12,6 +12,7 @@ func NewLogicalXor(variable node.Node, expression node.Node) node.Node {
 	return LogicalXor{
 		BinaryOp{
 			"BinaryLogicalXor",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n LogicalXor) Name() string {
 }
 
 func (n LogicalXor) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n LogicalXor) Walk(v node.Visitor) {

node/expr/binary_op/minus.go

@@ -12,6 +12,7 @@ func NewMinus(variable node.Node, expression node.Node) node.Node {
 	return Minus{
 		BinaryOp{
 			"BinaryMinus",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Minus) Name() string {
 }
 
 func (n Minus) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Minus) Walk(v node.Visitor) {

node/expr/binary_op/mod.go

@@ -12,6 +12,7 @@ func NewMod(variable node.Node, expression node.Node) node.Node {
 	return Mod{
 		BinaryOp{
 			"BinaryMod",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Mod) Name() string {
 }
 
 func (n Mod) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Mod) Walk(v node.Visitor) {

node/expr/binary_op/mul.go

@@ -12,6 +12,7 @@ func NewMul(variable node.Node, expression node.Node) node.Node {
 	return Mul{
 		BinaryOp{
 			"BinaryMul",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Mul) Name() string {
 }
 
 func (n Mul) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Mul) Walk(v node.Visitor) {

node/expr/binary_op/not_equal.go

@@ -12,6 +12,7 @@ func NewNotEqual(variable node.Node, expression node.Node) node.Node {
 	return NotEqual{
 		BinaryOp{
 			"BinaryNotEqual",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n NotEqual) Name() string {
 }
 
 func (n NotEqual) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n NotEqual) Walk(v node.Visitor) {

node/expr/binary_op/not_identical.go

@@ -12,6 +12,7 @@ func NewNotIdentical(variable node.Node, expression node.Node) node.Node {
 	return NotIdentical{
 		BinaryOp{
 			"BinaryNotIdentical",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n NotIdentical) Name() string {
 }
 
 func (n NotIdentical) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n NotIdentical) Walk(v node.Visitor) {

node/expr/binary_op/plus.go

@@ -12,6 +12,7 @@ func NewPlus(variable node.Node, expression node.Node) node.Node {
 	return Plus{
 		BinaryOp{
 			"BinaryPlus",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Plus) Name() string {
 }
 
 func (n Plus) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Plus) Walk(v node.Visitor) {

node/expr/binary_op/pow.go

@@ -12,6 +12,7 @@ func NewPow(variable node.Node, expression node.Node) node.Node {
 	return Pow{
 		BinaryOp{
 			"BinaryPow",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Pow) Name() string {
 }
 
 func (n Pow) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Pow) Walk(v node.Visitor) {

node/expr/binary_op/shift_left.go

@@ -12,6 +12,7 @@ func NewShiftLeft(variable node.Node, expression node.Node) node.Node {
 	return ShiftLeft{
 		BinaryOp{
 			"BinaryShiftLeft",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n ShiftLeft) Name() string {
 }
 
 func (n ShiftLeft) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ShiftLeft) Walk(v node.Visitor) {

node/expr/binary_op/shift_right.go

@@ -12,6 +12,7 @@ func NewShiftRight(variable node.Node, expression node.Node) node.Node {
 	return ShiftRight{
 		BinaryOp{
 			"BinaryShiftRight",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n ShiftRight) Name() string {
 }
 
 func (n ShiftRight) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ShiftRight) Walk(v node.Visitor) {

node/expr/binary_op/smaller.go

@@ -12,6 +12,7 @@ func NewSmaller(variable node.Node, expression node.Node) node.Node {
 	return Smaller{
 		BinaryOp{
 			"BinarySmaller",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Smaller) Name() string {
 }
 
 func (n Smaller) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Smaller) Walk(v node.Visitor) {

node/expr/binary_op/smaller_or_equal.go

@@ -12,6 +12,7 @@ func NewSmallerOrEqual(variable node.Node, expression node.Node) node.Node {
 	return SmallerOrEqual{
 		BinaryOp{
 			"BinarySmallerOrEqual",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n SmallerOrEqual) Name() string {
 }
 
 func (n SmallerOrEqual) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n SmallerOrEqual) Walk(v node.Visitor) {

node/expr/binary_op/spaceship.go

@@ -12,6 +12,7 @@ func NewSpaceship(variable node.Node, expression node.Node) node.Node {
 	return Spaceship{
 		BinaryOp{
 			"BinarySpaceship",
+			map[string]interface{}{},
 			variable,
 			expression,
 		},
@@ -23,7 +24,7 @@ func (n Spaceship) Name() string {
 }
 
 func (n Spaceship) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Spaceship) Walk(v node.Visitor) {

node/expr/bitwise_not.go

@@ -5,13 +5,15 @@ import (
 )
 
 type BitwiseNot struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewBitwiseNot(expression node.Node) node.Node {
 	return BitwiseNot{
 		"BitwiseNot",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n BitwiseNot) Name() string {
 }
 
 func (n BitwiseNot) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n BitwiseNot) Walk(v node.Visitor) {

node/expr/boolean_not.go

@@ -5,13 +5,15 @@ import (
 )
 
 type BooleanNot struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewBooleanNot(expression node.Node) node.Node {
 	return BooleanNot{
 		"BooleanNot",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n BooleanNot) Name() string {
 }
 
 func (n BooleanNot) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n BooleanNot) Walk(v node.Visitor) {

node/expr/cast/cast.go

@@ -5,6 +5,7 @@ import (
 )
 
 type Cast struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }

node/expr/cast/cast_array.go

@@ -12,6 +12,7 @@ func NewCastArray(expr node.Node) node.Node {
 	return CastArray{
 		Cast{
 			"CastArray",
+			map[string]interface{}{},
 			expr,
 		},
 	}
@@ -22,7 +23,7 @@ func (n CastArray) Name() string {
 }
 
 func (n CastArray) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n CastArray) Walk(v node.Visitor) {

node/expr/cast/cast_bool.go

@@ -12,6 +12,7 @@ func NewCastBool(expr node.Node) node.Node {
 	return CastBool{
 		Cast{
 			"CastBool",
+			map[string]interface{}{},
 			expr,
 		},
 	}
@@ -22,7 +23,7 @@ func (n CastBool) Name() string {
 }
 
 func (n CastBool) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n CastBool) Walk(v node.Visitor) {

node/expr/cast/cast_double.go

@@ -12,6 +12,7 @@ func NewCastDouble(expr node.Node) node.Node {
 	return CastDouble{
 		Cast{
 			"CastDouble",
+			map[string]interface{}{},
 			expr,
 		},
 	}
@@ -22,7 +23,7 @@ func (n CastDouble) Name() string {
 }
 
 func (n CastDouble) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n CastDouble) Walk(v node.Visitor) {

node/expr/cast/cast_int.go

@@ -12,6 +12,7 @@ func NewCastInt(expr node.Node) node.Node {
 	return CastInt{
 		Cast{
 			"CastInt",
+			map[string]interface{}{},
 			expr,
 		},
 	}
@@ -22,7 +23,7 @@ func (n CastInt) Name() string {
 }
 
 func (n CastInt) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n CastInt) Walk(v node.Visitor) {

node/expr/cast/cast_object.go

@@ -12,6 +12,7 @@ func NewCastObject(expr node.Node) node.Node {
 	return CastObject{
 		Cast{
 			"CastObject",
+			map[string]interface{}{},
 			expr,
 		},
 	}
@@ -22,7 +23,7 @@ func (n CastObject) Name() string {
 }
 
 func (n CastObject) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n CastObject) Walk(v node.Visitor) {

node/expr/cast/cast_string.go

@@ -12,6 +12,7 @@ func NewCastString(expr node.Node) node.Node {
 	return CastString{
 		Cast{
 			"CastString",
+			map[string]interface{}{},
 			expr,
 		},
 	}
@@ -22,7 +23,7 @@ func (n CastString) Name() string {
 }
 
 func (n CastString) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n CastString) Walk(v node.Visitor) {

node/expr/cast/cast_unset.go

@@ -12,6 +12,7 @@ func NewCastUnset(expr node.Node) node.Node {
 	return CastUnset{
 		Cast{
 			"CastUnset",
+			map[string]interface{}{},
 			expr,
 		},
 	}
@@ -22,7 +23,7 @@ func (n CastUnset) Name() string {
 }
 
 func (n CastUnset) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n CastUnset) Walk(v node.Visitor) {

node/expr/class_const_fetch.go

@@ -5,7 +5,7 @@ import (
 )
 
 func (n ClassConstFetch) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ClassConstFetch) Name() string {
@@ -14,6 +14,7 @@ func (n ClassConstFetch) Name() string {
 
 type ClassConstFetch struct {
 	name         string
+	attributes   map[string]interface{}
 	class        node.Node
 	constantName node.Node
 }
@@ -21,6 +22,7 @@ type ClassConstFetch struct {
 func NewClassConstFetch(class node.Node, constantName node.Node) node.Node {
 	return ClassConstFetch{
 		"ClassConstFetch",
+		map[string]interface{}{},
 		class,
 		constantName,
 	}

node/expr/clone.go

@@ -5,13 +5,15 @@ import (
 )
 
 type Clone struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewClone(expression node.Node) node.Node {
 	return Clone{
 		"Clone",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n Clone) Name() string {
 }
 
 func (n Clone) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Clone) Walk(v node.Visitor) {

node/expr/closure.go

@@ -32,7 +32,7 @@ func (n Closure) Name() string {
 }
 
 func (n Closure) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Closure) Walk(v node.Visitor) {

node/expr/closure_use.go

@@ -25,7 +25,7 @@ func (n ClusureUse) Name() string {
 }
 
 func (n ClusureUse) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ClusureUse) Walk(v node.Visitor) {

node/expr/const_fetch.go

@@ -5,13 +5,15 @@ import (
 )
 
 type ConstFetch struct {
-	name     string
-	constant node.Node
+	name       string
+	attributes map[string]interface{}
+	constant   node.Node
 }
 
 func NewConstFetch(constant node.Node) node.Node {
 	return ConstFetch{
 		"ConstFetch",
+		map[string]interface{}{},
 		constant,
 	}
 }
@@ -21,7 +23,7 @@ func (n ConstFetch) Name() string {
 }
 
 func (n ConstFetch) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ConstFetch) Walk(v node.Visitor) {

node/expr/empty.go

@@ -5,13 +5,15 @@ import (
 )
 
 type Empty struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewEmpty(expression node.Node) node.Node {
 	return Empty{
 		"Empty",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n Empty) Name() string {
 }
 
 func (n Empty) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Empty) Walk(v node.Visitor) {

node/expr/error_suppress.go

@@ -5,13 +5,15 @@ import (
 )
 
 type ErrorSuppress struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewErrorSuppress(expression node.Node) node.Node {
 	return ErrorSuppress{
 		"ErrorSuppress",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n ErrorSuppress) Name() string {
 }
 
 func (n ErrorSuppress) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ErrorSuppress) Walk(v node.Visitor) {

node/expr/eval.go

@@ -5,13 +5,15 @@ import (
 )
 
 type Eval struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewEval(expression node.Node) node.Node {
 	return Eval{
 		"Eval",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n Eval) Name() string {
 }
 
 func (n Eval) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Eval) Walk(v node.Visitor) {

node/expr/exit.go

@@ -25,7 +25,7 @@ func (n Exit) Name() string {
 }
 
 func (n Exit) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Exit) Walk(v node.Visitor) {

node/expr/function_call.go

@@ -5,14 +5,16 @@ import (
 )
 
 type FunctionCall struct {
-	name      string
-	function  node.Node
-	arguments []node.Node
+	name       string
+	attributes map[string]interface{}
+	function   node.Node
+	arguments  []node.Node
 }
 
 func NewFunctionCall(function node.Node, arguments []node.Node) node.Node {
 	return FunctionCall{
 		"FunctionCall",
+		map[string]interface{}{},
 		function,
 		arguments,
 	}
@@ -23,7 +25,7 @@ func (n FunctionCall) Name() string {
 }
 
 func (n FunctionCall) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n FunctionCall) Walk(v node.Visitor) {

node/expr/include.go

@@ -5,13 +5,15 @@ import (
 )
 
 type Include struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewInclude(expression node.Node) node.Node {
 	return Include{
 		"Include",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n Include) Name() string {
 }
 
 func (n Include) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Include) Walk(v node.Visitor) {

node/expr/include_once.go

@@ -5,13 +5,15 @@ import (
 )
 
 type IncludeOnce struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewIncludeOnce(expression node.Node) node.Node {
 	return IncludeOnce{
 		"IncludeOnce",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n IncludeOnce) Name() string {
 }
 
 func (n IncludeOnce) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n IncludeOnce) Walk(v node.Visitor) {

node/expr/instance_of.go

@@ -5,14 +5,16 @@ import (
 )
 
 type InstanceOf struct {
-	name  string
-	expr  node.Node
-	class node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
+	class      node.Node
 }
 
 func NewInstanceOf(expr node.Node, class node.Node) node.Node {
 	return InstanceOf{
 		"InstanceOf",
+		map[string]interface{}{},
 		expr,
 		class,
 	}
@@ -23,7 +25,7 @@ func (n InstanceOf) Name() string {
 }
 
 func (n InstanceOf) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n InstanceOf) Walk(v node.Visitor) {

node/expr/isset.go

@@ -5,13 +5,15 @@ import (
 )
 
 type Isset struct {
-	name      string
-	variables []node.Node
+	name       string
+	attributes map[string]interface{}
+	variables  []node.Node
 }
 
 func NewIsset(variables []node.Node) node.Node {
 	return Isset{
 		"Isset",
+		map[string]interface{}{},
 		variables,
 	}
 }
@@ -21,7 +23,7 @@ func (n Isset) Name() string {
 }
 
 func (n Isset) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Isset) Walk(v node.Visitor) {

node/expr/list.go

@@ -5,13 +5,15 @@ import (
 )
 
 type List struct {
-	name  string
-	items []node.Node
+	name       string
+	attributes map[string]interface{}
+	items      []node.Node
 }
 
 func NewList(items []node.Node) node.Node {
 	return List{
 		"List",
+		map[string]interface{}{},
 		items,
 	}
 }
@@ -21,7 +23,7 @@ func (n List) Name() string {
 }
 
 func (n List) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n List) Walk(v node.Visitor) {

node/expr/method_call.go

@@ -5,15 +5,17 @@ import (
 )
 
 type MethodCall struct {
-	name      string
-	variable  node.Node
-	method    node.Node
-	arguments []node.Node
+	name       string
+	attributes map[string]interface{}
+	variable   node.Node
+	method     node.Node
+	arguments  []node.Node
 }
 
 func NewMethodCall(variable node.Node, method node.Node, arguments []node.Node) node.Node {
 	return MethodCall{
 		"MethodCall",
+		map[string]interface{}{},
 		variable,
 		method,
 		arguments,
@@ -25,7 +27,7 @@ func (n MethodCall) Name() string {
 }
 
 func (n MethodCall) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n MethodCall) Walk(v node.Visitor) {

node/expr/new.go

@@ -5,14 +5,16 @@ import (
 )
 
 type New struct {
-	name      string
-	class     node.Node
-	arguments []node.Node
+	name       string
+	attributes map[string]interface{}
+	class      node.Node
+	arguments  []node.Node
 }
 
 func NewNew(class node.Node, arguments []node.Node) node.Node {
 	return New{
 		"New",
+		map[string]interface{}{},
 		class,
 		arguments,
 	}
@@ -23,7 +25,7 @@ func (n New) Name() string {
 }
 
 func (n New) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n New) Walk(v node.Visitor) {

node/expr/post_dec.go

@@ -5,13 +5,15 @@ import (
 )
 
 type PostDec struct {
-	name     string
-	variable node.Node
+	name       string
+	attributes map[string]interface{}
+	variable   node.Node
 }
 
 func NewPostDec(variable node.Node) node.Node {
 	return PostDec{
 		"PostDec",
+		map[string]interface{}{},
 		variable,
 	}
 }
@@ -21,7 +23,7 @@ func (n PostDec) Name() string {
 }
 
 func (n PostDec) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n PostDec) Walk(v node.Visitor) {

node/expr/post_inc.go

@@ -5,13 +5,15 @@ import (
 )
 
 type PostInc struct {
-	name     string
-	variable node.Node
+	name       string
+	attributes map[string]interface{}
+	variable   node.Node
 }
 
 func NewPostInc(variable node.Node) node.Node {
 	return PostInc{
 		"PostInc",
+		map[string]interface{}{},
 		variable,
 	}
 }
@@ -21,7 +23,7 @@ func (n PostInc) Name() string {
 }
 
 func (n PostInc) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n PostInc) Walk(v node.Visitor) {

node/expr/pre_dec.go

@@ -5,13 +5,15 @@ import (
 )
 
 type PreDec struct {
-	name     string
-	variable node.Node
+	name       string
+	attributes map[string]interface{}
+	variable   node.Node
 }
 
 func NewPreDec(variable node.Node) node.Node {
 	return PreDec{
 		"PreDec",
+		map[string]interface{}{},
 		variable,
 	}
 }
@@ -21,7 +23,7 @@ func (n PreDec) Name() string {
 }
 
 func (n PreDec) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n PreDec) Walk(v node.Visitor) {

node/expr/pre_inc.go

@@ -5,13 +5,15 @@ import (
 )
 
 type PreInc struct {
-	name     string
-	variable node.Node
+	name       string
+	attributes map[string]interface{}
+	variable   node.Node
 }
 
 func NewPreInc(variable node.Node) node.Node {
 	return PreInc{
 		"PreInc",
+		map[string]interface{}{},
 		variable,
 	}
 }
@@ -21,7 +23,7 @@ func (n PreInc) Name() string {
 }
 
 func (n PreInc) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n PreInc) Walk(v node.Visitor) {

node/expr/print.go

@@ -5,13 +5,15 @@ import (
 )
 
 type Print struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewPrint(expression node.Node) node.Node {
 	return Print{
 		"Print",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n Print) Name() string {
 }
 
 func (n Print) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Print) Walk(v node.Visitor) {

node/expr/property_fetch.go

@@ -5,14 +5,16 @@ import (
 )
 
 type PropertyFetch struct {
-	name     string
-	variable node.Node
-	property node.Node
+	name       string
+	attributes map[string]interface{}
+	variable   node.Node
+	property   node.Node
 }
 
 func NewPropertyFetch(variable node.Node, property node.Node) node.Node {
 	return PropertyFetch{
 		"PropertyFetch",
+		map[string]interface{}{},
 		variable,
 		property,
 	}
@@ -23,7 +25,7 @@ func (n PropertyFetch) Name() string {
 }
 
 func (n PropertyFetch) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n PropertyFetch) Walk(v node.Visitor) {

node/expr/require.go

@@ -5,13 +5,15 @@ import (
 )
 
 type Require struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewRequire(expression node.Node) node.Node {
 	return Require{
 		"Require",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n Require) Name() string {
 }
 
 func (n Require) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Require) Walk(v node.Visitor) {

node/expr/require_once.go

@@ -5,13 +5,15 @@ import (
 )
 
 type RequireOnce struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewRequireOnce(expression node.Node) node.Node {
 	return RequireOnce{
 		"RequireOnce",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n RequireOnce) Name() string {
 }
 
 func (n RequireOnce) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n RequireOnce) Walk(v node.Visitor) {

node/expr/shell_exec.go

@@ -5,13 +5,15 @@ import (
 )
 
 type ShellExec struct {
-	name  string
-	parts []node.Node
+	name       string
+	attributes map[string]interface{}
+	parts      []node.Node
 }
 
 func NewShellExec(parts []node.Node) node.Node {
 	return ShellExec{
 		"ShellExec",
+		map[string]interface{}{},
 		parts,
 	}
 }
@@ -21,7 +23,7 @@ func (n ShellExec) Name() string {
 }
 
 func (n ShellExec) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ShellExec) Walk(v node.Visitor) {

node/expr/short_array.go

@@ -5,13 +5,15 @@ import (
 )
 
 type ShortArray struct {
-	name  string
-	items []node.Node
+	name       string
+	attributes map[string]interface{}
+	items      []node.Node
 }
 
 func NewShortArray(items []node.Node) node.Node {
 	return ShortArray{
 		"ShortArray",
+		map[string]interface{}{},
 		items,
 	}
 }
@@ -21,7 +23,7 @@ func (n ShortArray) Name() string {
 }
 
 func (n ShortArray) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ShortArray) Walk(v node.Visitor) {

node/expr/short_list.go

@@ -5,13 +5,15 @@ import (
 )
 
 type ShortList struct {
-	name  string
-	items []node.Node
+	name       string
+	attributes map[string]interface{}
+	items      []node.Node
 }
 
 func NewShortList(items []node.Node) node.Node {
 	return ShortList{
 		"ShortList",
+		map[string]interface{}{},
 		items,
 	}
 }
@@ -21,7 +23,7 @@ func (n ShortList) Name() string {
 }
 
 func (n ShortList) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n ShortList) Walk(v node.Visitor) {

node/expr/static_call.go

@@ -5,15 +5,17 @@ import (
 )
 
 type StaticCall struct {
-	name      string
-	class     node.Node
-	call      node.Node
-	arguments []node.Node
+	name       string
+	attributes map[string]interface{}
+	class      node.Node
+	call       node.Node
+	arguments  []node.Node
 }
 
 func NewStaticCall(class node.Node, call node.Node, arguments []node.Node) node.Node {
 	return StaticCall{
 		"StaticCall",
+		map[string]interface{}{},
 		class,
 		call,
 		arguments,
@@ -25,7 +27,7 @@ func (n StaticCall) Name() string {
 }
 
 func (n StaticCall) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n StaticCall) Walk(v node.Visitor) {

node/expr/static_property_fetch.go

@@ -5,14 +5,16 @@ import (
 )
 
 type StaticPropertyFetch struct {
-	name     string
-	class    node.Node
-	property node.Node
+	name       string
+	attributes map[string]interface{}
+	class      node.Node
+	property   node.Node
 }
 
 func NewStaticPropertyFetch(class node.Node, property node.Node) node.Node {
 	return StaticPropertyFetch{
 		"StaticPropertyFetch",
+		map[string]interface{}{},
 		class,
 		property,
 	}
@@ -23,7 +25,7 @@ func (n StaticPropertyFetch) Name() string {
 }
 
 func (n StaticPropertyFetch) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n StaticPropertyFetch) Walk(v node.Visitor) {

node/expr/ternary.go

@@ -5,15 +5,17 @@ import (
 )
 
 type Ternary struct {
-	name      string
-	condition node.Node
-	ifTrue    node.Node
-	ifFalse   node.Node
+	name       string
+	attributes map[string]interface{}
+	condition  node.Node
+	ifTrue     node.Node
+	ifFalse    node.Node
 }
 
 func NewTernary(condition node.Node, ifTrue node.Node, ifFalse node.Node) node.Node {
 	return Ternary{
 		"Ternary",
+		map[string]interface{}{},
 		condition,
 		ifTrue,
 		ifFalse,
@@ -25,7 +27,7 @@ func (n Ternary) Name() string {
 }
 
 func (n Ternary) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Ternary) Walk(v node.Visitor) {

node/expr/unary_minus.go

@@ -5,13 +5,15 @@ import (
 )
 
 type UnaryMinus struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewUnaryMinus(expression node.Node) node.Node {
 	return UnaryMinus{
 		"UnaryMinus",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n UnaryMinus) Name() string {
 }
 
 func (n UnaryMinus) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n UnaryMinus) Walk(v node.Visitor) {

node/expr/unary_plus.go

@@ -5,13 +5,15 @@ import (
 )
 
 type UnaryPlus struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewUnaryPlus(expression node.Node) node.Node {
 	return UnaryPlus{
 		"UnaryPlus",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n UnaryPlus) Name() string {
 }
 
 func (n UnaryPlus) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n UnaryPlus) Walk(v node.Visitor) {

node/expr/variable.go

@@ -5,13 +5,15 @@ import (
 )
 
 type Variable struct {
-	name    string
-	varName node.Node
+	name       string
+	attributes map[string]interface{}
+	varName    node.Node
 }
 
 func NewVariable(varName node.Node) node.Node {
 	return Variable{
 		"Variable",
+		map[string]interface{}{},
 		varName,
 	}
 }
@@ -21,7 +23,7 @@ func (n Variable) Name() string {
 }
 
 func (n Variable) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Variable) Walk(v node.Visitor) {

node/expr/yield.go

@@ -5,14 +5,16 @@ import (
 )
 
 type Yield struct {
-	name  string
-	key   node.Node
-	value node.Node
+	name       string
+	attributes map[string]interface{}
+	key        node.Node
+	value      node.Node
 }
 
 func NewYield(key node.Node, value node.Node) node.Node {
 	return Yield{
 		"Yield",
+		map[string]interface{}{},
 		key,
 		value,
 	}
@@ -23,7 +25,7 @@ func (n Yield) Name() string {
 }
 
 func (n Yield) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Yield) Walk(v node.Visitor) {

node/expr/yield_from.go

@@ -5,13 +5,15 @@ import (
 )
 
 type YieldFrom struct {
-	name string
-	expr node.Node
+	name       string
+	attributes map[string]interface{}
+	expr       node.Node
 }
 
 func NewYieldFrom(expression node.Node) node.Node {
 	return YieldFrom{
 		"YieldFrom",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -21,7 +23,7 @@ func (n YieldFrom) Name() string {
 }
 
 func (n YieldFrom) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n YieldFrom) Walk(v node.Visitor) {

node/name/fully_qualified.go

@@ -12,6 +12,7 @@ func NewFullyQualified(parts []node.Node) node.Node {
 	return FullyQualified{
 		NameNode{
 			"FullyQualifiedName",
+			map[string]interface{}{},
 			parts,
 		},
 	}
@@ -22,5 +23,5 @@ func (n FullyQualified) Name() string {
 }
 
 func (n FullyQualified) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }

node/name/name.go

@@ -5,13 +5,15 @@ import (
 )
 
 type NameNode struct {
-	name  string
-	parts []node.Node
+	name       string
+	attributes map[string]interface{}
+	parts      []node.Node
 }
 
 func NewName(parts []node.Node) node.Node {
 	return NameNode{
 		"Name",
+		map[string]interface{}{},
 		parts,
 	}
 }
@@ -21,7 +23,7 @@ func (n NameNode) Name() string {
 }
 
 func (n NameNode) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n NameNode) Walk(v node.Visitor) {

node/name/relative.go

@@ -12,6 +12,7 @@ func NewRelative(parts []node.Node) node.Node {
 	return Relative{
 		NameNode{
 			"RelativeName",
+			map[string]interface{}{},
 			parts,
 		},
 	}
@@ -22,5 +23,5 @@ func (n Relative) Name() string {
 }
 
 func (n Relative) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }

node/nullable.go

@@ -1,13 +1,15 @@
 package node
 
 type Nullable struct {
-	name string
-	expr Node
+	name       string
+	attributes map[string]interface{}
+	expr       Node
 }
 
 func NewNullable(expression Node) Node {
 	return Nullable{
 		"Nullable",
+		map[string]interface{}{},
 		expression,
 	}
 }
@@ -17,7 +19,7 @@ func (n Nullable) Name() string {
 }
 
 func (n Nullable) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Nullable) Walk(v Visitor) {

node/scalar/dnumber.go

@@ -23,7 +23,7 @@ func (n Dnumber) Name() string {
 }
 
 func (n Dnumber) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Dnumber) Walk(v node.Visitor) {

node/scalar/encapsed.go

@@ -5,13 +5,15 @@ import (
 )
 
 type Encapsed struct {
-	name  string
-	parts []node.Node
+	name       string
+	attributes map[string]interface{}
+	parts      []node.Node
 }
 
 func NewEncapsed(parts []node.Node) node.Node {
 	return Encapsed{
 		"Encapsed",
+		map[string]interface{}{},
 		parts,
 	}
 }
@@ -21,7 +23,7 @@ func (n Encapsed) Name() string {
 }
 
 func (n Encapsed) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n Encapsed) Walk(v node.Visitor) {

node/scalar/encapsed_string_part.go

@@ -23,7 +23,7 @@ func (n EncapsedStringPart) Name() string {
 }
 
 func (n EncapsedStringPart) Attributes() map[string]interface{} {
-	return nil
+	return n.attributes
 }
 
 func (n EncapsedStringPart) Walk(v node.Visitor) {