public async Task <Document> RefactorAsync(
            Document document,
            ExpressionStatementSyntax expressionStatement,
            CancellationToken cancellationToken)
        {
            SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);

            InvocationExpressionSyntax invocationExpression = GetInvocationExpression(expressionStatement);

            semanticModel.TryGetMethodInfo(invocationExpression, out MethodInfo methodInfo, cancellationToken);

            MemberInvocationExpressionInfo invocationInfo = SyntaxInfo.MemberInvocationExpressionInfo(invocationExpression);

            ITypeSymbol typeSymbol = methodInfo.ReturnType;

            string name = ((IdentifierNameSyntax)WalkDownMethodChain(invocationInfo).Expression).Identifier.ValueText;

            StatementsInfo statementsInfo = SyntaxInfo.StatementsInfo(expressionStatement);

            SyntaxList <StatementSyntax> statements = statementsInfo.Statements;

            int index = statements.IndexOf(expressionStatement);

            string indentation = CSharpFormatter.GetIncreasedIndentation(expressionStatement, cancellationToken).ToString();

            var sb = new StringBuilder(invocationExpression.ToString());

            int j = index;

            while (j < statements.Count - 1)
            {
                StatementSyntax statement = statements[j + 1];

                if (!IsFixableStatement(statement, name, typeSymbol, semanticModel, cancellationToken))
                {
                    break;
                }

                sb.AppendLine();
                sb.Append(indentation);
                sb.Append(GetTextToAppend((ExpressionStatementSyntax)statement));

                j++;
            }

            StatementSyntax lastStatement = statements[j];

            SyntaxList <StatementSyntax> newStatements = statements;

            while (j > index)
            {
                newStatements = newStatements.RemoveAt(j);
                j--;
            }

            ExpressionSyntax newInvocationExpression = SyntaxFactory.ParseExpression(sb.ToString());

            SyntaxTriviaList trailingTrivia = statementsInfo
                                              .Node
                                              .DescendantTrivia(TextSpan.FromBounds(invocationExpression.Span.End, lastStatement.Span.End))
                                              .ToSyntaxTriviaList()
                                              .EmptyIfWhitespace()
                                              .AddRange(lastStatement.GetTrailingTrivia());

            ExpressionStatementSyntax newExpressionStatement = expressionStatement
                                                               .ReplaceNode(invocationExpression, newInvocationExpression)
                                                               .WithLeadingTrivia(expressionStatement.GetLeadingTrivia())
                                                               .WithTrailingTrivia(trailingTrivia)
                                                               .WithFormatterAndSimplifierAnnotations();

            newStatements = newStatements.ReplaceAt(index, newExpressionStatement);

            return(await document.ReplaceStatementsAsync(statementsInfo, newStatements, cancellationToken).ConfigureAwait(false));
        }
        public static async Task <Document> RefactorAsync(
            Document document,
            ExpressionStatementSyntax expressionStatement,
            CancellationToken cancellationToken)
        {
            SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);

            INamedTypeSymbol symbol = semanticModel.GetTypeByMetadataName(MetadataNames.System_Text_StringBuilder);

            var invocationExpression = (InvocationExpressionSyntax)expressionStatement.Expression;

            MemberInvocationExpression memberInvocation = MemberInvocationExpression.Create(invocationExpression);

            ExpressionSyntax expression = GetFirstInvocationInMethodChain(memberInvocation, symbol, semanticModel, cancellationToken).Expression;

            StatementContainer statementContainer = StatementContainer.Create(expressionStatement);

            SyntaxList <StatementSyntax> statements = statementContainer.Statements;

            int index = statements.IndexOf(expressionStatement);

            string indentation = CSharpFormatter.GetIncreasedIndentation(expressionStatement, cancellationToken).ToString();

            var sb = new StringBuilder(invocationExpression.ToString());

            int j = index;

            while (j < statements.Count - 1)
            {
                StatementSyntax statement = statements[j + 1];

                if (!IsFixable(statement, expression, symbol, semanticModel, cancellationToken))
                {
                    break;
                }

                sb.AppendLine();
                sb.Append(indentation);
                sb.Append(GetTextToAppend((ExpressionStatementSyntax)statement, symbol, semanticModel, cancellationToken));

                j++;
            }

            StatementSyntax lastStatement = statements[j];

            SyntaxList <StatementSyntax> newStatements = statements;

            while (j > index)
            {
                newStatements = newStatements.RemoveAt(j);
                j--;
            }

            ExpressionSyntax newInvocationExpression = SyntaxFactory.ParseExpression(sb.ToString());

            SyntaxTriviaList trailingTrivia = statementContainer
                                              .Node
                                              .DescendantTrivia(TextSpan.FromBounds(invocationExpression.Span.End, lastStatement.Span.End))
                                              .ToSyntaxTriviaList()
                                              .EmptyIfWhitespace()
                                              .AddRange(lastStatement.GetTrailingTrivia());

            ExpressionStatementSyntax newExpressionStatement = expressionStatement
                                                               .WithExpression(newInvocationExpression)
                                                               .WithLeadingTrivia(expressionStatement.GetLeadingTrivia())
                                                               .WithTrailingTrivia(trailingTrivia)
                                                               .WithFormatterAndSimplifierAnnotations();

            newStatements = newStatements.ReplaceAt(index, newExpressionStatement);

            return(await document.ReplaceNodeAsync(statementContainer.Node, statementContainer.NodeWithStatements(newStatements), cancellationToken).ConfigureAwait(false));
        }