CloneVisitor.java

/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2015 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 */

package com.github.javaparser.ast.visitor;

import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.ImportDeclaration;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.PackageDeclaration;
import com.github.javaparser.ast.TypeParameter;
import com.github.javaparser.ast.body.*;
import com.github.javaparser.ast.comments.BlockComment;
import com.github.javaparser.ast.comments.Comment;
import com.github.javaparser.ast.comments.JavadocComment;
import com.github.javaparser.ast.comments.LineComment;
import com.github.javaparser.ast.expr.*;
import com.github.javaparser.ast.stmt.*;
import com.github.javaparser.ast.type.*;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

public class CloneVisitor implements GenericVisitor<Node, Object> {

	@Override
	public Node visit(CompilationUnit _n, Object _arg) {
		PackageDeclaration package_ = cloneNodes(_n.getPackage(), _arg);
		List<ImportDeclaration> imports = visit(_n.getImports(), _arg);
		List<TypeDeclaration> types = visit(_n.getTypes(), _arg);

		return new CompilationUnit(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				package_, imports, types
		);
	}

	@Override
	public Node visit(PackageDeclaration _n, Object _arg) {
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		NameExpr name = cloneNodes(_n.getName(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		PackageDeclaration r = new PackageDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				annotations, name
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ImportDeclaration _n, Object _arg) {
		NameExpr name = cloneNodes(_n.getName(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ImportDeclaration r = new ImportDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				name, _n.isStatic(), _n.isAsterisk()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(TypeParameter _n, Object _arg) {
        List<ClassOrInterfaceType> typeBound = visit(_n.getTypeBound(), _arg);

        List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
        TypeParameter r = new TypeParameter(_n.getBeginLine(),
                _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
                _n.getName(), typeBound, annotations);

        Comment comment = cloneNodes(_n.getComment(), _arg);
        r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(LineComment _n, Object _arg) {
		return new LineComment(_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(), _n.getContent());
	}

	@Override
	public Node visit(BlockComment _n, Object _arg) {
		return new BlockComment(_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(), _n.getContent());
	}

	@Override
	public Node visit(ClassOrInterfaceDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		List<TypeParameter> typeParameters = visit(_n.getTypeParameters(), _arg);
		List<ClassOrInterfaceType> extendsList = visit(_n.getExtends(), _arg);
		List<ClassOrInterfaceType> implementsList = visit(_n.getImplements(), _arg);
		List<BodyDeclaration> members = visit(_n.getMembers(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ClassOrInterfaceDeclaration r = new ClassOrInterfaceDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getModifiers(), annotations, _n.isInterface(), _n.getName(), typeParameters, extendsList, implementsList, members
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(EnumDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		List<ClassOrInterfaceType> implementsList = visit(_n.getImplements(), _arg);
		List<EnumConstantDeclaration> entries = visit(_n.getEntries(), _arg);
		List<BodyDeclaration> members = visit(_n.getMembers(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		EnumDeclaration r = new EnumDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				 _n.getModifiers(), annotations, _n.getName(), implementsList, entries, members
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(EmptyTypeDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		EmptyTypeDeclaration r = new EmptyTypeDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(EnumConstantDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		List<Expression> args = visit(_n.getArgs(), _arg);
		List<BodyDeclaration> classBody = visit(_n.getClassBody(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		EnumConstantDeclaration r = new EnumConstantDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				 annotations, _n.getName(), args, classBody
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(AnnotationDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		List<BodyDeclaration> members = visit(_n.getMembers(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		AnnotationDeclaration r = new AnnotationDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				 _n.getModifiers(), annotations, _n.getName(), members
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(AnnotationMemberDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		Type type_ = cloneNodes(_n.getType(), _arg);
		Expression defaultValue = cloneNodes(_n.getDefaultValue(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		AnnotationMemberDeclaration r = new AnnotationMemberDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				 _n.getModifiers(), annotations, type_, _n.getName(), defaultValue
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(FieldDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		Type type_ = cloneNodes(_n.getType(), _arg);
		List<VariableDeclarator> variables = visit(_n.getVariables(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		FieldDeclaration r = new FieldDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				 _n.getModifiers(), annotations, type_, variables
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(VariableDeclarator _n, Object _arg) {
		VariableDeclaratorId id = cloneNodes(_n.getId(), _arg);
		Expression init = cloneNodes(_n.getInit(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		VariableDeclarator r = new VariableDeclarator(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				id, init
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(VariableDeclaratorId _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		VariableDeclaratorId r = new VariableDeclaratorId(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getName(), _n.getArrayCount()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ConstructorDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		List<TypeParameter> typeParameters = visit(_n.getTypeParameters(), _arg);
		List<Parameter> parameters = visit(_n.getParameters(), _arg);
		List<NameExpr> throws_ = visit(_n.getThrows(), _arg);
		BlockStmt block = cloneNodes(_n.getBlock(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ConstructorDeclaration r = new ConstructorDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				 _n.getModifiers(), annotations, typeParameters, _n.getName(), parameters, throws_, block
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(MethodDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		List<TypeParameter> typeParameters = visit(_n.getTypeParameters(), _arg);
		Type type_ = cloneNodes(_n.getType(), _arg);
		List<Parameter> parameters = visit(_n.getParameters(), _arg);
		List<ReferenceType> throws_ = visit(_n.getThrows(), _arg);
		BlockStmt block = cloneNodes(_n.getBody(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		MethodDeclaration r = new MethodDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				 _n.getModifiers(), annotations, typeParameters, type_, _n.getName(), parameters, _n.getArrayCount(), throws_, block
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(Parameter _n, Object _arg) {
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		Type type_ = cloneNodes(_n.getType(), _arg);
		VariableDeclaratorId id = cloneNodes(_n.getId(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		Parameter r = new Parameter(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getModifiers(), annotations, type_, _n.isVarArgs(), id
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(MultiTypeParameter _n, Object _arg) {
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		UnionType type = cloneNodes(_n.getType(), _arg);
		VariableDeclaratorId id = cloneNodes(_n.getId(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		MultiTypeParameter r = new MultiTypeParameter(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getModifiers(), annotations, type, id
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(EmptyMemberDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		EmptyMemberDeclaration r = new EmptyMemberDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(InitializerDeclaration _n, Object _arg) {
		JavadocComment javaDoc = cloneNodes(_n.getJavaDoc(), _arg);
		BlockStmt block = cloneNodes(_n.getBlock(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		InitializerDeclaration r = new InitializerDeclaration(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				 _n.isStatic(), block
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(JavadocComment _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);
		JavadocComment r = new JavadocComment(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getContent()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ClassOrInterfaceType _n, Object _arg) {
		ClassOrInterfaceType scope = cloneNodes(_n.getScope(), _arg);
		List<Type> typeArgs = visit(_n.getTypeArgs(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ClassOrInterfaceType r = new ClassOrInterfaceType(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				scope, _n.getName(), _n.getTypeArguments()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(PrimitiveType _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		PrimitiveType r = new PrimitiveType(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getType()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ReferenceType _n, Object _arg) {
		List<AnnotationExpr> ann = visit(_n.getAnnotations(), _arg);
		Type type_ = cloneNodes(_n.getType(), _arg);
		List<List<AnnotationExpr>> arraysAnnotations = _n.getArraysAnnotations();
		List<List<AnnotationExpr>> _arraysAnnotations = null;
		if(arraysAnnotations != null){
			_arraysAnnotations = new LinkedList<List<AnnotationExpr>>();
			for(List<AnnotationExpr> aux: arraysAnnotations){
				_arraysAnnotations.add(visit(aux, _arg));
			}
		}

        ReferenceType r = new ReferenceType(_n.getBeginLine(),
                _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(), type_,
                _n.getArrayCount(), ann, _arraysAnnotations);
        Comment comment = cloneNodes(_n.getComment(), _arg);
        r.setComment(comment);
		return r;
	}

    @Override
    public Node visit(IntersectionType _n, Object _arg) {
        List<ReferenceType> elements = visit(_n.getElements(), _arg);

        IntersectionType r = new IntersectionType(_n.getBeginLine(),
                _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
                elements);
        Comment comment = cloneNodes(_n.getComment(), _arg);
        r.setComment(comment);
        return r;
    }

    @Override
    public Node visit(UnionType _n, Object _arg) {
        List<ReferenceType> elements = visit(_n.getElements(), _arg);

        UnionType r = new UnionType(_n.getBeginLine(),
                _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
                elements);
        Comment comment = cloneNodes(_n.getComment(), _arg);
        r.setComment(comment);
        return r;
    }

	@Override
	public Node visit(VoidType _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		VoidType r = new VoidType(_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn());
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(WildcardType _n, Object _arg) {
		ReferenceType ext = cloneNodes(_n.getExtends(), _arg);
		ReferenceType sup = cloneNodes(_n.getSuper(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		WildcardType r = new WildcardType(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				ext, sup
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(UnknownType _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		UnknownType r = new UnknownType();
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ArrayAccessExpr _n, Object _arg) {
		Expression name = cloneNodes(_n.getName(), _arg);
		Expression index = cloneNodes(_n.getIndex(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ArrayAccessExpr r = new ArrayAccessExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				name, index
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ArrayCreationExpr _n, Object _arg) {
		Type type_ = cloneNodes(_n.getType(), _arg);
		List<Expression> dimensions = visit(_n.getDimensions(), _arg);
		ArrayCreationExpr r = new ArrayCreationExpr(_n.getBeginLine(),
				_n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(), type_,
				dimensions, _n.getArrayCount());
		if (_n.getInitializer() != null) {// ArrayCreationExpr has two mutually
			// exclusive constructors
			r.setInitializer(cloneNodes(_n.getInitializer(), _arg));
		}
		List<List<AnnotationExpr>> arraysAnnotations = _n.getArraysAnnotations();
		List<List<AnnotationExpr>> _arraysAnnotations = null;
		if(arraysAnnotations != null){
			_arraysAnnotations = new LinkedList<List<AnnotationExpr>>();
			for(List<AnnotationExpr> aux: arraysAnnotations){
				_arraysAnnotations.add(visit(aux, _arg));
			}
		}
		r.setArraysAnnotations(_arraysAnnotations);
        Comment comment = cloneNodes(_n.getComment(), _arg);
        r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ArrayInitializerExpr _n, Object _arg) {
		List<Expression> values = visit(_n.getValues(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ArrayInitializerExpr r = new ArrayInitializerExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				values
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(AssignExpr _n, Object _arg) {
		Expression target = cloneNodes(_n.getTarget(), _arg);
		Expression value = cloneNodes(_n.getValue(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		AssignExpr r = new AssignExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				target, value, _n.getOperator());
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(BinaryExpr _n, Object _arg) {
		Expression left = cloneNodes(_n.getLeft(), _arg);
		Expression right = cloneNodes(_n.getRight(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		BinaryExpr r = new BinaryExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				left, right, _n.getOperator()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(CastExpr _n, Object _arg) {
		Type type_ = cloneNodes(_n.getType(), _arg);
		Expression expr = cloneNodes(_n.getExpr(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		CastExpr r = new CastExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				type_, expr
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ClassExpr _n, Object _arg) {
		Type type_ = cloneNodes(_n.getType(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ClassExpr r = new ClassExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				type_
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ConditionalExpr _n, Object _arg) {
		Expression condition = cloneNodes(_n.getCondition(), _arg);
		Expression thenExpr = cloneNodes(_n.getThenExpr(), _arg);
		Expression elseExpr = cloneNodes(_n.getElseExpr(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ConditionalExpr r = new ConditionalExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				condition, thenExpr, elseExpr
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(EnclosedExpr _n, Object _arg) {
		Expression inner = cloneNodes(_n.getInner(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		EnclosedExpr r = new EnclosedExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				inner
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(FieldAccessExpr _n, Object _arg) {
		Expression scope = cloneNodes(_n.getScope(), _arg);
		List<Type> typeArgs = visit(_n.getTypeArgs(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		FieldAccessExpr r = new FieldAccessExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				scope, typeArgs, _n.getField()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(InstanceOfExpr _n, Object _arg) {
		Expression expr = cloneNodes(_n.getExpr(), _arg);
		Type type_ = cloneNodes(_n.getType(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		InstanceOfExpr r = new InstanceOfExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				expr, type_
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(StringLiteralExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);
		StringLiteralExpr r = new StringLiteralExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getValue()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(TemplateLiteralExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);
		TemplateLiteralExpr r = new TemplateLiteralExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getValue()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(IntegerLiteralExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		IntegerLiteralExpr r = new IntegerLiteralExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getValue()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(LongLiteralExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		LongLiteralExpr r = new LongLiteralExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getValue()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(IntegerLiteralMinValueExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		IntegerLiteralMinValueExpr r = new IntegerLiteralMinValueExpr(_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn());
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(LongLiteralMinValueExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		LongLiteralMinValueExpr r = new LongLiteralMinValueExpr(_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn());
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(CharLiteralExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		CharLiteralExpr r = new CharLiteralExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getValue()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(DoubleLiteralExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		DoubleLiteralExpr r = new DoubleLiteralExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getValue()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(BooleanLiteralExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		BooleanLiteralExpr r = new BooleanLiteralExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getValue()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(NullLiteralExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		NullLiteralExpr r = new NullLiteralExpr(_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn());
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(MethodCallExpr _n, Object _arg) {
		Expression scope = cloneNodes(_n.getScope(), _arg);
		List<Type> typeArgs = visit(_n.getTypeArgs(), _arg);
		List<Expression> args = visit(_n.getArgs(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		MethodCallExpr r = new MethodCallExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				scope, typeArgs, _n.getName(), args
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(NameExpr _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		NameExpr r = new NameExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getName()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ObjectCreationExpr _n, Object _arg) {
		Expression scope = cloneNodes(_n.getScope(), _arg);
		ClassOrInterfaceType type_ = cloneNodes(_n.getType(), _arg);
		List<Type> typeArgs = visit(_n.getTypeArgs(), _arg);
		List<Expression> args = visit(_n.getArgs(), _arg);
		List<BodyDeclaration> anonymousBody = visit(_n.getAnonymousClassBody(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ObjectCreationExpr r = new ObjectCreationExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				scope, type_, typeArgs, args, anonymousBody
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(QualifiedNameExpr _n, Object _arg) {
		NameExpr scope = cloneNodes(_n.getQualifier(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		QualifiedNameExpr r = new QualifiedNameExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				scope, _n.getName()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ThisExpr _n, Object _arg) {
		Expression classExpr = cloneNodes(_n.getClassExpr(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ThisExpr r = new ThisExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				classExpr
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(SuperExpr _n, Object _arg) {
		Expression classExpr = cloneNodes(_n.getClassExpr(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		SuperExpr r = new SuperExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				classExpr
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(UnaryExpr _n, Object _arg) {
		Expression expr = cloneNodes(_n.getExpr(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		UnaryExpr r = new UnaryExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				expr, _n.getOperator()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(VariableDeclarationExpr _n, Object _arg) {
		List<AnnotationExpr> annotations = visit(_n.getAnnotations(), _arg);
		Type type_ = cloneNodes(_n.getType(), _arg);
		List<VariableDeclarator> vars = visit(_n.getVars(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		VariableDeclarationExpr r = new VariableDeclarationExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getModifiers(), annotations, type_, vars
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(MarkerAnnotationExpr _n, Object _arg) {
		NameExpr name = cloneNodes(_n.getName(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		MarkerAnnotationExpr r = new MarkerAnnotationExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				name
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(SingleMemberAnnotationExpr _n, Object _arg) {
		NameExpr name = cloneNodes(_n.getName(), _arg);
		Expression memberValue = cloneNodes(_n.getMemberValue(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		SingleMemberAnnotationExpr r = new SingleMemberAnnotationExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				name, memberValue
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(NormalAnnotationExpr _n, Object _arg) {
		NameExpr name = cloneNodes(_n.getName(), _arg);
		List<MemberValuePair> pairs = visit(_n.getPairs(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		NormalAnnotationExpr r = new NormalAnnotationExpr(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				name, pairs
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(MemberValuePair _n, Object _arg) {
		Expression value = cloneNodes(_n.getValue(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		MemberValuePair r = new MemberValuePair(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getName(), value
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ExplicitConstructorInvocationStmt _n, Object _arg) {
		List<Type> typeArgs = visit(_n.getTypeArgs(), _arg);
		Expression expr = cloneNodes(_n.getExpr(), _arg);
		List<Expression> args = visit(_n.getArgs(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ExplicitConstructorInvocationStmt r = new ExplicitConstructorInvocationStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				typeArgs, _n.isThis(), expr, args
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(TypeDeclarationStmt _n, Object _arg) {
		TypeDeclaration typeDecl = cloneNodes(_n.getTypeDeclaration(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		TypeDeclarationStmt r = new TypeDeclarationStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				typeDecl
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(AssertStmt _n, Object _arg) {
		Expression check = cloneNodes(_n.getCheck(), _arg);
		Expression message = cloneNodes(_n.getMessage(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		AssertStmt r = new AssertStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				check, message
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(BlockStmt _n, Object _arg) {
		List<Statement> stmts = visit(_n.getStmts(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		BlockStmt r = new BlockStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				stmts
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(LabeledStmt _n, Object _arg) {
		Statement stmt = cloneNodes(_n.getStmt(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		LabeledStmt r = new LabeledStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getLabel(), stmt
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(EmptyStmt _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		EmptyStmt r = new EmptyStmt(_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn());
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ExpressionStmt _n, Object _arg) {
		Expression expr = cloneNodes(_n.getExpression(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ExpressionStmt r = new ExpressionStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				expr
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(SwitchStmt _n, Object _arg) {
		Expression selector = cloneNodes(_n.getSelector(), _arg);
		List<SwitchEntryStmt> entries = visit(_n.getEntries(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		SwitchStmt r = new SwitchStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				selector, entries
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(SwitchEntryStmt _n, Object _arg) {
		Expression label = cloneNodes(_n.getLabel(), _arg);
		List<Statement> stmts = visit(_n.getStmts(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		SwitchEntryStmt r = new SwitchEntryStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				label, stmts
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(BreakStmt _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		BreakStmt r = new BreakStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getId()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ReturnStmt _n, Object _arg) {
		Expression expr = cloneNodes(_n.getExpr(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ReturnStmt r = new ReturnStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				expr
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(IfStmt _n, Object _arg) {
		Expression condition = cloneNodes(_n.getCondition(), _arg);
		Statement thenStmt = cloneNodes(_n.getThenStmt(), _arg);
		Statement elseStmt = cloneNodes(_n.getElseStmt(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		IfStmt r = new IfStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				condition, thenStmt, elseStmt
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(WhileStmt _n, Object _arg) {
		Expression condition = cloneNodes(_n.getCondition(), _arg);
		Statement body = cloneNodes(_n.getBody(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		WhileStmt r = new WhileStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				condition, body
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ContinueStmt _n, Object _arg) {
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ContinueStmt r = new ContinueStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				_n.getId()
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(DoStmt _n, Object _arg) {
		Statement body = cloneNodes(_n.getBody(), _arg);
		Expression condition = cloneNodes(_n.getCondition(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		DoStmt r = new DoStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				body, condition
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ForeachStmt _n, Object _arg) {
		VariableDeclarationExpr var = cloneNodes(_n.getVariable(), _arg);
		Expression iterable = cloneNodes(_n.getIterable(), _arg);
		Statement body = cloneNodes(_n.getBody(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ForeachStmt r = new ForeachStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				var, iterable, body
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ForStmt _n, Object _arg) {
		List<Expression> init = visit(_n.getInit(), _arg);
		Expression compare = cloneNodes(_n.getCompare(), _arg);
		List<Expression> update = visit(_n.getUpdate(), _arg);
		Statement body = cloneNodes(_n.getBody(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ForStmt r = new ForStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				init, compare, update, body
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(ThrowStmt _n, Object _arg) {
		Expression expr = cloneNodes(_n.getExpr(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		ThrowStmt r = new ThrowStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				expr
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(SynchronizedStmt _n, Object _arg) {
		Expression expr = cloneNodes(_n.getExpr(), _arg);
		BlockStmt block = cloneNodes(_n.getBlock(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		SynchronizedStmt r = new SynchronizedStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				expr, block
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(TryStmt _n, Object _arg) {
		List<VariableDeclarationExpr> resources = visit(_n.getResources(),_arg);
		BlockStmt tryBlock = cloneNodes(_n.getTryBlock(), _arg);
		List<CatchClause> catchs = visit(_n.getCatchs(), _arg);
		BlockStmt finallyBlock = cloneNodes(_n.getFinallyBlock(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		TryStmt r = new TryStmt(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				resources, tryBlock, catchs, finallyBlock
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(CatchClause _n, Object _arg) {
		Parameter param = cloneNodes(_n.getParam(), _arg);
		BlockStmt catchBlock = cloneNodes(_n.getCatchBlock(), _arg);
		Comment comment = cloneNodes(_n.getComment(), _arg);

		CatchClause r = new CatchClause(
				_n.getBeginLine(), _n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(),
				param.getModifiers(), param.getAnnotations(), param.getType(), param.getId(), catchBlock
		);
		r.setComment(comment);
		return r;
	}

	@Override
	public Node visit(LambdaExpr _n, Object _arg) {

		List<Parameter> lambdaParameters = visit(_n.getParameters(), _arg);

		Statement body = cloneNodes(_n.getBody(), _arg);

		LambdaExpr r = new LambdaExpr(_n.getBeginLine(), _n.getBeginColumn(),
				_n.getEndLine(), _n.getEndColumn(), lambdaParameters, body,
				_n.isParametersEnclosed());

		return r;
	}

	@Override
	public Node visit(MethodReferenceExpr _n, Object arg) {

		List<TypeParameter> typeParams = visit(_n.getTypeParameters(), arg);
		Expression scope = cloneNodes(_n.getScope(), arg);

		MethodReferenceExpr r = new MethodReferenceExpr(_n.getBeginLine(),
				_n.getBeginColumn(), _n.getEndLine(), _n.getEndColumn(), scope,
				typeParams, _n.getIdentifier());
		return r;
	}

	@Override
	public Node visit(TypeExpr n, Object arg) {

		Type t = cloneNodes(n.getType(), arg);

		TypeExpr r = new TypeExpr(n.getBeginLine(), n.getBeginColumn(),
				n.getEndLine(), n.getEndColumn(), t);

		return r;
	}

    public <T extends Node> List<T> visit(List<T> _nodes, Object _arg) {
        if (_nodes == null)
            return null;
        List<T> r = new ArrayList<T>(_nodes.size());
        for (T n : _nodes) {
            T rN = cloneNodes(n, _arg);
            if (rN != null)
                r.add(rN);
        }
        return r;
    }

    protected <T extends Node> T cloneNodes(T _node, Object _arg) {
        if (_node == null)
            return null;
        Node r = _node.accept(this, _arg);
        if (r == null)
            return null;
        return (T) r;
    }

	@Override
	public Node visit(UiBodyExpr n, Object arg) {
		if (n == null) {
			return null;
		}
		final List<UiExpr> children = visit(n.getChildren(), arg);
		return new UiBodyExpr(n.getBeginLine(), n.getBeginColumn(), n.getEndLine(), n.getEndColumn(), children);
	}

	@Override
	public Node visit(UiAttrExpr n, Object arg) {
		if (n == null) {
			return null;
		}
		final NameExpr name = (NameExpr) visit(n.getName(), arg);
		final Expression expr = (Expression) n.getExpression().accept(this, arg);

		return new UiAttrExpr(n.getBeginLine(), n.getBeginColumn(), n.getEndLine(), n.getEndColumn(), name, n.isAttribute(), expr);
	}

	@Override
	public Node visit(UiContainerExpr n, Object arg) {
		if (n == null) {
			return null;
		}
		final NameExpr name = (NameExpr) visit(n.getNameExpr(), arg);
		final List<UiAttrExpr> attrs = visit(n.getAttributes(), arg);
		UiBodyExpr body = (UiBodyExpr) visit(n.getBody(), arg);

		return new UiContainerExpr(n.getBeginLine(), n.getBeginColumn(), n.getEndLine(), n.getEndColumn(), name, attrs, body, n.isInTemplate());
	}

    @Override
    public Node visit(JsonContainerExpr n, Object arg) {
        if (n == null) {
            return null;
        }
        final List<JsonPairExpr> pairs = visit(n.getPairs(), arg);
        return new JsonContainerExpr(n.getBeginLine(), n.getBeginColumn(), n.getEndLine(), n.getEndColumn(), n.isArray(), pairs);
    }

    @Override
    public Node visit(JsonPairExpr n, Object arg) {
        if (n == null) {
            return null;
        }
        final Expression key = getExpression(n.getKeyExpr(), arg);
        final Expression value = getExpression(n.getValueExpr(), arg);

        return new JsonPairExpr(n.getBeginLine(), n.getBeginColumn(), n.getEndLine(), n.getEndColumn(),
            key, value);
    }

    @Override
    public Node visit(CssContainerExpr n, Object arg) {
        if (n == null) {
            return null;
        }
        final List<CssSelectorExpr> selectors = visit(n.getSelectors(), arg);
        final List<CssRuleExpr> rules = visit(n.getRules(), arg);
        return new CssContainerExpr(n.getBeginLine(), n.getBeginColumn(), n.getEndLine(), n.getEndColumn(),
            selectors, rules);
    }

    @Override
    public Node visit(CssRuleExpr n, Object arg) {
        if (n == null) {
            return null;
        }
        final Expression key = getExpression(n.getKey(), arg);
        final Expression value = getExpression(n.getValue(), arg);
        return new CssRuleExpr(n.getBeginLine(), n.getBeginColumn(), n.getEndLine(), n.getEndColumn(),
            key, value);
    }

    @Override
    public Node visit(CssValueExpr n, Object arg) {
        if (n == null) {
            return null;
        }
        final Expression value = getExpression(n.getValue(), arg);

        return new CssValueExpr(n.getBeginLine(), n.getBeginColumn(), n.getEndLine(), n.getEndColumn(),
            value, n.getUnit(), n.isImportant());
    }

    @Override
    public Node visit(CssBlockExpr n, Object arg) {
        if (n == null) {
            return null;
        }
        final List<CssContainerExpr> containers = visit(n.getContainers(), arg);
        return new CssBlockExpr(n.getBeginLine(), n.getBeginColumn(), n.getEndLine(), n.getEndColumn(), containers);
    }

    @Override
    public Node visit(CssSelectorExpr n, Object arg) {
        return null;
    }

    protected Expression getExpression(Expression from, Object arg) {
        return from == null ? null : (Expression) from.accept(this, arg);
    }

}