fluent interface for node SetAttribure

node/argument.go

@@ -32,8 +32,9 @@ func (n Argument) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Argument) SetAttribute(key string, value interface{}) {
+func (n Argument) SetAttribute(key string, value interface{}) Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Argument) Position() *Position {

node/expr/array.go

@@ -7,7 +7,7 @@ import (
 type Array struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	items      []node.Node
 }
 
@@ -32,8 +32,9 @@ func (n Array) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Array) SetAttribute(key string, value interface{}) {
+func (n Array) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Array) Position() *node.Position {

node/expr/array_dim_fetch.go

@@ -7,7 +7,7 @@ import (
 type ArrayDimFetch struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	variable   node.Node
 	dim        node.Node
 }
@@ -34,8 +34,9 @@ func (n ArrayDimFetch) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ArrayDimFetch) SetAttribute(key string, value interface{}) {
+func (n ArrayDimFetch) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ArrayDimFetch) Position() *node.Position {

node/expr/array_item.go

@@ -7,7 +7,7 @@ import (
 type ArrayItem struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	key        node.Node
 	val        node.Node
 }
@@ -36,8 +36,9 @@ func (n ArrayItem) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ArrayItem) SetAttribute(key string, value interface{}) {
+func (n ArrayItem) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ArrayItem) Position() *node.Position {

node/expr/assign_op/assign.go

@@ -32,8 +32,9 @@ func (n Assign) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Assign) SetAttribute(key string, value interface{}) {
+func (n Assign) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Assign) Position() *node.Position {

node/expr/assign_op/assign_ref.go

@@ -32,8 +32,9 @@ func (n AssignRef) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n AssignRef) SetAttribute(key string, value interface{}) {
+func (n AssignRef) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n AssignRef) Position() *node.Position {

node/expr/assign_op/bitwise_and.go

@@ -32,8 +32,9 @@ func (n BitwiseAnd) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n BitwiseAnd) SetAttribute(key string, value interface{}) {
+func (n BitwiseAnd) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n BitwiseAnd) Position() *node.Position {

node/expr/assign_op/bitwise_or.go

@@ -32,8 +32,9 @@ func (n BitwiseOr) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n BitwiseOr) SetAttribute(key string, value interface{}) {
+func (n BitwiseOr) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n BitwiseOr) Position() *node.Position {

node/expr/assign_op/bitwise_xor.go

@@ -28,8 +28,9 @@ func (n BitwiseXor) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n BitwiseXor) SetAttribute(key string, value interface{}) {
+func (n BitwiseXor) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n BitwiseXor) Position() *node.Position {

node/expr/assign_op/concat.go

@@ -32,8 +32,9 @@ func (n Concat) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Concat) SetAttribute(key string, value interface{}) {
+func (n Concat) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Concat) Position() *node.Position {

node/expr/assign_op/div.go

@@ -32,8 +32,9 @@ func (n Div) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Div) SetAttribute(key string, value interface{}) {
+func (n Div) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Div) Position() *node.Position {

node/expr/assign_op/minus.go

@@ -32,8 +32,9 @@ func (n Minus) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Minus) SetAttribute(key string, value interface{}) {
+func (n Minus) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Minus) Position() *node.Position {

node/expr/assign_op/mod.go

@@ -32,8 +32,9 @@ func (n Mod) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Mod) SetAttribute(key string, value interface{}) {
+func (n Mod) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Mod) Position() *node.Position {

node/expr/assign_op/mul.go

@@ -32,8 +32,9 @@ func (n Mul) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Mul) SetAttribute(key string, value interface{}) {
+func (n Mul) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Mul) Position() *node.Position {

node/expr/assign_op/plus.go

@@ -32,8 +32,9 @@ func (n Plus) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Plus) SetAttribute(key string, value interface{}) {
+func (n Plus) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Plus) Position() *node.Position {

node/expr/assign_op/pow.go

@@ -32,8 +32,9 @@ func (n Pow) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Pow) SetAttribute(key string, value interface{}) {
+func (n Pow) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Pow) Position() *node.Position {

node/expr/assign_op/shift_left.go

@@ -32,8 +32,9 @@ func (n ShiftLeft) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ShiftLeft) SetAttribute(key string, value interface{}) {
+func (n ShiftLeft) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ShiftLeft) Position() *node.Position {

node/expr/assign_op/shift_right.go

@@ -32,8 +32,9 @@ func (n ShiftRight) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ShiftRight) SetAttribute(key string, value interface{}) {
+func (n ShiftRight) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ShiftRight) Position() *node.Position {

node/expr/binary_op/bitwise_and.go

@@ -32,8 +32,9 @@ func (n BitwiseAnd) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n BitwiseAnd) SetAttribute(key string, value interface{}) {
+func (n BitwiseAnd) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n BitwiseAnd) Position() *node.Position {

node/expr/binary_op/bitwise_or.go

@@ -28,8 +28,9 @@ func (n BitwiseOr) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n BitwiseOr) SetAttribute(key string, value interface{}) {
+func (n BitwiseOr) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n BitwiseOr) Position() *node.Position {

node/expr/binary_op/bitwise_xor.go

@@ -28,8 +28,9 @@ func (n BitwiseXor) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n BitwiseXor) SetAttribute(key string, value interface{}) {
+func (n BitwiseXor) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n BitwiseXor) Position() *node.Position {

node/expr/binary_op/boolean_and.go

@@ -32,8 +32,9 @@ func (n BooleanAnd) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n BooleanAnd) SetAttribute(key string, value interface{}) {
+func (n BooleanAnd) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n BooleanAnd) Position() *node.Position {

node/expr/binary_op/boolean_or.go

@@ -32,8 +32,9 @@ func (n BooleanOr) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n BooleanOr) SetAttribute(key string, value interface{}) {
+func (n BooleanOr) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n BooleanOr) Position() *node.Position {

node/expr/binary_op/coalesce.go

@@ -32,8 +32,9 @@ func (n Coalesce) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Coalesce) SetAttribute(key string, value interface{}) {
+func (n Coalesce) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Coalesce) Position() *node.Position {

node/expr/binary_op/concat.go

@@ -32,8 +32,9 @@ func (n Concat) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Concat) SetAttribute(key string, value interface{}) {
+func (n Concat) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Concat) Position() *node.Position {

node/expr/binary_op/div.go

@@ -32,8 +32,9 @@ func (n Div) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Div) SetAttribute(key string, value interface{}) {
+func (n Div) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Div) Position() *node.Position {

node/expr/binary_op/equal.go

@@ -32,8 +32,9 @@ func (n Equal) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Equal) SetAttribute(key string, value interface{}) {
+func (n Equal) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Equal) Position() *node.Position {

node/expr/binary_op/greater.go

@@ -32,8 +32,9 @@ func (n Greater) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Greater) SetAttribute(key string, value interface{}) {
+func (n Greater) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Greater) Position() *node.Position {

node/expr/binary_op/greater_or_equal.go

@@ -32,8 +32,9 @@ func (n GreaterOrEqual) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n GreaterOrEqual) SetAttribute(key string, value interface{}) {
+func (n GreaterOrEqual) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n GreaterOrEqual) Position() *node.Position {

node/expr/binary_op/identical.go

@@ -32,8 +32,9 @@ func (n Identical) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Identical) SetAttribute(key string, value interface{}) {
+func (n Identical) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Identical) Position() *node.Position {

node/expr/binary_op/logical_and.go

@@ -32,8 +32,9 @@ func (n LogicalAnd) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n LogicalAnd) SetAttribute(key string, value interface{}) {
+func (n LogicalAnd) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n LogicalAnd) Position() *node.Position {

node/expr/binary_op/logical_or.go

@@ -32,8 +32,9 @@ func (n LogicalOr) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n LogicalOr) SetAttribute(key string, value interface{}) {
+func (n LogicalOr) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n LogicalOr) Position() *node.Position {

node/expr/binary_op/logical_xor.go

@@ -32,8 +32,9 @@ func (n LogicalXor) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n LogicalXor) SetAttribute(key string, value interface{}) {
+func (n LogicalXor) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n LogicalXor) Position() *node.Position {

node/expr/binary_op/minus.go

@@ -32,8 +32,9 @@ func (n Minus) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Minus) SetAttribute(key string, value interface{}) {
+func (n Minus) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Minus) Position() *node.Position {

node/expr/binary_op/mod.go

@@ -32,8 +32,9 @@ func (n Mod) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Mod) SetAttribute(key string, value interface{}) {
+func (n Mod) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Mod) Position() *node.Position {

node/expr/binary_op/mul.go

@@ -32,8 +32,9 @@ func (n Mul) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Mul) SetAttribute(key string, value interface{}) {
+func (n Mul) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Mul) Position() *node.Position {

node/expr/binary_op/not_equal.go

@@ -32,8 +32,9 @@ func (n NotEqual) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n NotEqual) SetAttribute(key string, value interface{}) {
+func (n NotEqual) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n NotEqual) Position() *node.Position {

node/expr/binary_op/not_identical.go

@@ -32,8 +32,9 @@ func (n NotIdentical) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n NotIdentical) SetAttribute(key string, value interface{}) {
+func (n NotIdentical) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n NotIdentical) Position() *node.Position {

node/expr/binary_op/plus.go

@@ -32,8 +32,9 @@ func (n Plus) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Plus) SetAttribute(key string, value interface{}) {
+func (n Plus) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Plus) Position() *node.Position {

node/expr/binary_op/pow.go

@@ -32,8 +32,9 @@ func (n Pow) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Pow) SetAttribute(key string, value interface{}) {
+func (n Pow) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Pow) Position() *node.Position {

node/expr/binary_op/shift_left.go

@@ -32,8 +32,9 @@ func (n ShiftLeft) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ShiftLeft) SetAttribute(key string, value interface{}) {
+func (n ShiftLeft) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ShiftLeft) Position() *node.Position {

node/expr/binary_op/shift_right.go

@@ -32,8 +32,9 @@ func (n ShiftRight) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ShiftRight) SetAttribute(key string, value interface{}) {
+func (n ShiftRight) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ShiftRight) Position() *node.Position {

node/expr/binary_op/smaller.go

@@ -32,8 +32,9 @@ func (n Smaller) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Smaller) SetAttribute(key string, value interface{}) {
+func (n Smaller) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Smaller) Position() *node.Position {

node/expr/binary_op/smaller_or_equal.go

@@ -32,8 +32,9 @@ func (n SmallerOrEqual) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n SmallerOrEqual) SetAttribute(key string, value interface{}) {
+func (n SmallerOrEqual) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n SmallerOrEqual) Position() *node.Position {

node/expr/binary_op/spaceship.go

@@ -32,8 +32,9 @@ func (n Spaceship) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Spaceship) SetAttribute(key string, value interface{}) {
+func (n Spaceship) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Spaceship) Position() *node.Position {

node/expr/bitwise_not.go

@@ -7,7 +7,7 @@ import (
 type BitwiseNot struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n BitwiseNot) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n BitwiseNot) SetAttribute(key string, value interface{}) {
+func (n BitwiseNot) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n BitwiseNot) Position() *node.Position {

node/expr/boolean_not.go

@@ -7,7 +7,7 @@ import (
 type BooleanNot struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n BooleanNot) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n BooleanNot) SetAttribute(key string, value interface{}) {
+func (n BooleanNot) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n BooleanNot) Position() *node.Position {

node/expr/cast/cast_array.go

@@ -31,8 +31,9 @@ func (n CastArray) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n CastArray) SetAttribute(key string, value interface{}) {
+func (n CastArray) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n CastArray) Position() *node.Position {

node/expr/cast/cast_bool.go

@@ -31,8 +31,9 @@ func (n CastBool) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n CastBool) SetAttribute(key string, value interface{}) {
+func (n CastBool) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n CastBool) Position() *node.Position {

node/expr/cast/cast_double.go

@@ -31,8 +31,9 @@ func (n CastDouble) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n CastDouble) SetAttribute(key string, value interface{}) {
+func (n CastDouble) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n CastDouble) Position() *node.Position {

node/expr/cast/cast_int.go

@@ -31,8 +31,9 @@ func (n CastInt) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n CastInt) SetAttribute(key string, value interface{}) {
+func (n CastInt) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n CastInt) Position() *node.Position {

node/expr/cast/cast_object.go

@@ -31,8 +31,9 @@ func (n CastObject) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n CastObject) SetAttribute(key string, value interface{}) {
+func (n CastObject) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n CastObject) Position() *node.Position {

node/expr/cast/cast_string.go

@@ -31,8 +31,9 @@ func (n CastString) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n CastString) SetAttribute(key string, value interface{}) {
+func (n CastString) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n CastString) Position() *node.Position {

node/expr/cast/cast_unset.go

@@ -31,8 +31,9 @@ func (n CastUnset) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n CastUnset) SetAttribute(key string, value interface{}) {
+func (n CastUnset) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n CastUnset) Position() *node.Position {

node/expr/class_const_fetch.go

@@ -34,8 +34,9 @@ func (n ClassConstFetch) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ClassConstFetch) SetAttribute(key string, value interface{}) {
+func (n ClassConstFetch) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ClassConstFetch) Position() *node.Position {

node/expr/clone.go

@@ -7,7 +7,7 @@ import (
 type Clone struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n Clone) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Clone) SetAttribute(key string, value interface{}) {
+func (n Clone) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Clone) Position() *node.Position {

node/expr/closure.go

@@ -42,8 +42,9 @@ func (n Closure) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Closure) SetAttribute(key string, value interface{}) {
+func (n Closure) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Closure) Position() *node.Position {

node/expr/closure_use.go

@@ -7,7 +7,7 @@ import (
 type ClusureUse struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	variable   node.Node
 }
 
@@ -34,8 +34,9 @@ func (n ClusureUse) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ClusureUse) SetAttribute(key string, value interface{}) {
+func (n ClusureUse) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ClusureUse) Position() *node.Position {

node/expr/const_fetch.go

@@ -7,7 +7,7 @@ import (
 type ConstFetch struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	constant   node.Node
 }
 
@@ -32,8 +32,9 @@ func (n ConstFetch) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ConstFetch) SetAttribute(key string, value interface{}) {
+func (n ConstFetch) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ConstFetch) Position() *node.Position {

node/expr/empty.go

@@ -7,7 +7,7 @@ import (
 type Empty struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n Empty) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Empty) SetAttribute(key string, value interface{}) {
+func (n Empty) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Empty) Position() *node.Position {

node/expr/error_suppress.go

@@ -7,7 +7,7 @@ import (
 type ErrorSuppress struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n ErrorSuppress) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ErrorSuppress) SetAttribute(key string, value interface{}) {
+func (n ErrorSuppress) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ErrorSuppress) Position() *node.Position {

node/expr/eval.go

@@ -7,7 +7,7 @@ import (
 type Eval struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n Eval) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Eval) SetAttribute(key string, value interface{}) {
+func (n Eval) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Eval) Position() *node.Position {

node/expr/exit.go

@@ -7,7 +7,7 @@ import (
 type Exit struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -34,8 +34,9 @@ func (n Exit) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Exit) SetAttribute(key string, value interface{}) {
+func (n Exit) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Exit) Position() *node.Position {

node/expr/function_call.go

@@ -7,7 +7,7 @@ import (
 type FunctionCall struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	function   node.Node
 	arguments  []node.Node
 }
@@ -34,8 +34,9 @@ func (n FunctionCall) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n FunctionCall) SetAttribute(key string, value interface{}) {
+func (n FunctionCall) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n FunctionCall) Position() *node.Position {

node/expr/include.go

@@ -7,7 +7,7 @@ import (
 type Include struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n Include) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Include) SetAttribute(key string, value interface{}) {
+func (n Include) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Include) Position() *node.Position {

node/expr/include_once.go

@@ -7,7 +7,7 @@ import (
 type IncludeOnce struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n IncludeOnce) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n IncludeOnce) SetAttribute(key string, value interface{}) {
+func (n IncludeOnce) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n IncludeOnce) Position() *node.Position {

node/expr/instance_of.go

@@ -7,7 +7,7 @@ import (
 type InstanceOf struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 	class      node.Node
 }
@@ -34,8 +34,9 @@ func (n InstanceOf) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n InstanceOf) SetAttribute(key string, value interface{}) {
+func (n InstanceOf) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n InstanceOf) Position() *node.Position {

node/expr/isset.go

@@ -7,7 +7,7 @@ import (
 type Isset struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	variables  []node.Node
 }
 
@@ -32,8 +32,9 @@ func (n Isset) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Isset) SetAttribute(key string, value interface{}) {
+func (n Isset) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Isset) Position() *node.Position {

node/expr/list.go

@@ -7,7 +7,7 @@ import (
 type List struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	items      []node.Node
 }
 
@@ -32,8 +32,9 @@ func (n List) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n List) SetAttribute(key string, value interface{}) {
+func (n List) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n List) Position() *node.Position {

node/expr/method_call.go

@@ -7,7 +7,7 @@ import (
 type MethodCall struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	variable   node.Node
 	method     node.Node
 	arguments  []node.Node
@@ -36,8 +36,9 @@ func (n MethodCall) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n MethodCall) SetAttribute(key string, value interface{}) {
+func (n MethodCall) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n MethodCall) Position() *node.Position {

node/expr/new.go

@@ -7,7 +7,7 @@ import (
 type New struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	class      node.Node
 	arguments  []node.Node
 }
@@ -34,8 +34,9 @@ func (n New) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n New) SetAttribute(key string, value interface{}) {
+func (n New) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n New) Position() *node.Position {

node/expr/post_dec.go

@@ -7,7 +7,7 @@ import (
 type PostDec struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	variable   node.Node
 }
 
@@ -32,8 +32,9 @@ func (n PostDec) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n PostDec) SetAttribute(key string, value interface{}) {
+func (n PostDec) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n PostDec) Position() *node.Position {

node/expr/post_inc.go

@@ -7,7 +7,7 @@ import (
 type PostInc struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	variable   node.Node
 }
 
@@ -32,8 +32,9 @@ func (n PostInc) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n PostInc) SetAttribute(key string, value interface{}) {
+func (n PostInc) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n PostInc) Position() *node.Position {

node/expr/pre_dec.go

@@ -7,7 +7,7 @@ import (
 type PreDec struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	variable   node.Node
 }
 
@@ -32,8 +32,9 @@ func (n PreDec) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n PreDec) SetAttribute(key string, value interface{}) {
+func (n PreDec) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n PreDec) Position() *node.Position {

node/expr/pre_inc.go

@@ -7,7 +7,7 @@ import (
 type PreInc struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	variable   node.Node
 }
 
@@ -32,8 +32,9 @@ func (n PreInc) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n PreInc) SetAttribute(key string, value interface{}) {
+func (n PreInc) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n PreInc) Position() *node.Position {

node/expr/print.go

@@ -7,7 +7,7 @@ import (
 type Print struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n Print) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Print) SetAttribute(key string, value interface{}) {
+func (n Print) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Print) Position() *node.Position {

node/expr/property_fetch.go

@@ -7,7 +7,7 @@ import (
 type PropertyFetch struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	variable   node.Node
 	property   node.Node
 }
@@ -34,8 +34,9 @@ func (n PropertyFetch) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n PropertyFetch) SetAttribute(key string, value interface{}) {
+func (n PropertyFetch) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n PropertyFetch) Position() *node.Position {

node/expr/require.go

@@ -7,7 +7,7 @@ import (
 type Require struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n Require) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Require) SetAttribute(key string, value interface{}) {
+func (n Require) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Require) Position() *node.Position {

node/expr/require_once.go

@@ -7,7 +7,7 @@ import (
 type RequireOnce struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n RequireOnce) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n RequireOnce) SetAttribute(key string, value interface{}) {
+func (n RequireOnce) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n RequireOnce) Position() *node.Position {

node/expr/shell_exec.go

@@ -7,7 +7,7 @@ import (
 type ShellExec struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	parts      []node.Node
 }
 
@@ -32,8 +32,9 @@ func (n ShellExec) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ShellExec) SetAttribute(key string, value interface{}) {
+func (n ShellExec) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ShellExec) Position() *node.Position {

node/expr/short_array.go

@@ -7,7 +7,7 @@ import (
 type ShortArray struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	items      []node.Node
 }
 
@@ -32,8 +32,9 @@ func (n ShortArray) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ShortArray) SetAttribute(key string, value interface{}) {
+func (n ShortArray) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ShortArray) Position() *node.Position {

node/expr/short_list.go

@@ -7,7 +7,7 @@ import (
 type ShortList struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	items      []node.Node
 }
 
@@ -32,8 +32,9 @@ func (n ShortList) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n ShortList) SetAttribute(key string, value interface{}) {
+func (n ShortList) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n ShortList) Position() *node.Position {

node/expr/static_call.go

@@ -7,7 +7,7 @@ import (
 type StaticCall struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	class      node.Node
 	call       node.Node
 	arguments  []node.Node
@@ -36,8 +36,9 @@ func (n StaticCall) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n StaticCall) SetAttribute(key string, value interface{}) {
+func (n StaticCall) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n StaticCall) Position() *node.Position {

node/expr/static_property_fetch.go

@@ -7,7 +7,7 @@ import (
 type StaticPropertyFetch struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	class      node.Node
 	property   node.Node
 }
@@ -34,8 +34,9 @@ func (n StaticPropertyFetch) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n StaticPropertyFetch) SetAttribute(key string, value interface{}) {
+func (n StaticPropertyFetch) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n StaticPropertyFetch) Position() *node.Position {

node/expr/ternary.go

@@ -7,7 +7,7 @@ import (
 type Ternary struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	condition  node.Node
 	ifTrue     node.Node
 	ifFalse    node.Node
@@ -36,8 +36,9 @@ func (n Ternary) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Ternary) SetAttribute(key string, value interface{}) {
+func (n Ternary) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Ternary) Position() *node.Position {

node/expr/unary_minus.go

@@ -7,7 +7,7 @@ import (
 type UnaryMinus struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n UnaryMinus) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n UnaryMinus) SetAttribute(key string, value interface{}) {
+func (n UnaryMinus) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n UnaryMinus) Position() *node.Position {

node/expr/unary_plus.go

@@ -7,7 +7,7 @@ import (
 type UnaryPlus struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n UnaryPlus) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n UnaryPlus) SetAttribute(key string, value interface{}) {
+func (n UnaryPlus) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n UnaryPlus) Position() *node.Position {

node/expr/variable.go

@@ -7,7 +7,7 @@ import (
 type Variable struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	varName    node.Node
 }
 
@@ -32,8 +32,9 @@ func (n Variable) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Variable) SetAttribute(key string, value interface{}) {
+func (n Variable) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Variable) Position() *node.Position {

node/expr/yield.go

@@ -7,7 +7,7 @@ import (
 type Yield struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	key        node.Node
 	value      node.Node
 }
@@ -34,8 +34,9 @@ func (n Yield) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Yield) SetAttribute(key string, value interface{}) {
+func (n Yield) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Yield) Position() *node.Position {

node/expr/yield_from.go

@@ -7,7 +7,7 @@ import (
 type YieldFrom struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	expr       node.Node
 }
 
@@ -32,8 +32,9 @@ func (n YieldFrom) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n YieldFrom) SetAttribute(key string, value interface{}) {
+func (n YieldFrom) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n YieldFrom) Position() *node.Position {

node/identifier.go

@@ -32,8 +32,9 @@ func (n Identifier) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Identifier) SetAttribute(key string, value interface{}) {
+func (n Identifier) SetAttribute(key string, value interface{}) Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Identifier) Position() *Position {

node/name/name.go

@@ -7,7 +7,7 @@ import (
 type NameNode struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 	parts      []node.Node
 }
 
@@ -32,8 +32,9 @@ func (n NameNode) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n NameNode) SetAttribute(key string, value interface{}) {
+func (n NameNode) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n NameNode) Position() *node.Position {

node/name/name_part.go

@@ -7,7 +7,7 @@ import (
 type NamePart struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 }
 
 func NewNamePart(value string) node.Node {
@@ -32,8 +32,9 @@ func (n NamePart) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n NamePart) SetAttribute(key string, value interface{}) {
+func (n NamePart) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n NamePart) Position() *node.Position {

node/node.go

@@ -10,7 +10,7 @@ type Node interface {
 type Attributer interface {
 	Attributes() map[string]interface{}
 	Attribute(key string) interface{}
-	SetAttribute(key string, value interface{})
+	SetAttribute(key string, value interface{}) Node
 }
 
 type Positioner interface {

node/nullable.go

@@ -28,8 +28,9 @@ func (n Nullable) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Nullable) SetAttribute(key string, value interface{}) {
+func (n Nullable) SetAttribute(key string, value interface{}) Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Nullable) Position() *Position {

node/parameter.go

@@ -35,8 +35,9 @@ func (n Parameter) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Parameter) SetAttribute(key string, value interface{}) {
+func (n Parameter) SetAttribute(key string, value interface{}) Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Parameter) Position() *Position {

node/scalar/dnumber.go

@@ -7,7 +7,7 @@ import (
 type Dnumber struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 }
 
 func NewDnumber(value string) node.Node {
@@ -32,8 +32,9 @@ func (n Dnumber) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Dnumber) SetAttribute(key string, value interface{}) {
+func (n Dnumber) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Dnumber) Position() *node.Position {

node/scalar/encapsed.go

@@ -32,8 +32,9 @@ func (n Encapsed) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Encapsed) SetAttribute(key string, value interface{}) {
+func (n Encapsed) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Encapsed) Position() *node.Position {

node/scalar/encapsed_string_part.go

@@ -7,7 +7,7 @@ import (
 type EncapsedStringPart struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 }
 
 func NewEncapsedStringPart(value string) node.Node {
@@ -32,8 +32,9 @@ func (n EncapsedStringPart) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n EncapsedStringPart) SetAttribute(key string, value interface{}) {
+func (n EncapsedStringPart) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n EncapsedStringPart) Position() *node.Position {

node/scalar/lnumber.go

@@ -7,7 +7,7 @@ import (
 type Lnumber struct {
 	name       string
 	attributes map[string]interface{}
-	position *node.Position
+	position   *node.Position
 }
 
 func NewLnumber(value string) node.Node {
@@ -32,8 +32,9 @@ func (n Lnumber) Attribute(key string) interface{} {
 	return n.attributes[key]
 }
 
-func (n Lnumber) SetAttribute(key string, value interface{}) {
+func (n Lnumber) SetAttribute(key string, value interface{}) node.Node {
 	n.attributes[key] = value
+	return n
 }
 
 func (n Lnumber) Position() *node.Position {