private static Task <Document> RefactorAsync(
            Document document,
            SingleLocalDeclarationStatementInfo localInfo,
            SemanticModel semanticModel,
            CancellationToken cancellationToken)
        {
            StatementsInfo statementsInfo = SyntaxInfo.StatementsInfo(localInfo.Statement);

            var localSymbol = (ILocalSymbol)semanticModel.GetDeclaredSymbol(localInfo.Declarator, cancellationToken);

            IdentifierNameSyntax identifierName = FindLastReference(localSymbol, statementsInfo.Node, semanticModel, cancellationToken);

            TextSpan span;

            if (identifierName == null)
            {
                span = localInfo.Statement.Span;
            }
            else
            {
                int position = identifierName.SpanStart;
                span = TextSpan.FromBounds(localInfo.Statement.SpanStart, statementsInfo.First(f => f.Span.Contains(position)).Span.End);
            }

            StatementsSelection selectedStatements = StatementsSelection.Create(statementsInfo, span);

            var refactoring = new WrapStatements.WrapInUsingStatementRefactoring();

            return(refactoring.RefactorAsync(document, selectedStatements, cancellationToken));
        }
        public static Task <Document> RefactorAsync(
            Document document,
            ObjectCreationExpressionSyntax objectCreation,
            StatementsSelection selectedStatements,
            CancellationToken cancellationToken = default(CancellationToken))
        {
            StatementsInfo statementsInfo = selectedStatements.Info;

            ExpressionStatementSyntax[] expressionStatements = selectedStatements
                                                               .Skip(1)
                                                               .Cast <ExpressionStatementSyntax>()
                                                               .ToArray();

            StatementSyntax firstStatement = selectedStatements.First();

            SyntaxList <StatementSyntax> newStatements = statementsInfo.Statements.Replace(
                firstStatement,
                firstStatement.ReplaceNode(
                    objectCreation,
                    objectCreation.WithInitializer(CreateInitializer(objectCreation, expressionStatements))));

            int count = expressionStatements.Length;
            int index = selectedStatements.StartIndex + 1;

            while (count > 0)
            {
                newStatements = newStatements.RemoveAt(index);
                count--;
            }

            return(document.ReplaceStatementsAsync(statementsInfo, newStatements, cancellationToken));
        }
Esempio n. 3
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 public static ImmutableArray <IfRefactoring> Analyze(
     StatementsSelection selectedStatements,
     SemanticModel semanticModel,
     CancellationToken cancellationToken)
 {
     return(Analyze(selectedStatements, DefaultOptions, semanticModel, cancellationToken));
 }
        private static bool VerifyLocalDeclarationStatements(
            StatementsSelection selectedStatements,
            SemanticModel semanticModel,
            CancellationToken cancellationToken)
        {
            SyntaxList <StatementSyntax> statements = selectedStatements.Statements;

            ITypeSymbol typeSymbol = null;

            for (int i = selectedStatements.StartIndex; i < selectedStatements.EndIndex; i++)
            {
                StatementSyntax statement = statements[i];

                if (!(statement is LocalDeclarationStatementSyntax localDeclaration))
                {
                    return(false);
                }

                VariableDeclarationSyntax declaration = localDeclaration.Declaration;

                foreach (VariableDeclaratorSyntax variable in declaration.Variables)
                {
                    var symbol = (ILocalSymbol)semanticModel.GetDeclaredSymbol(variable, cancellationToken);

                    if (symbol == null)
                    {
                        continue;
                    }

                    if (symbol.Type.IsErrorType())
                    {
                        continue;
                    }

                    if (typeSymbol == null)
                    {
                        typeSymbol = symbol.Type;
                    }
                    else if (!typeSymbol.Equals(symbol.Type))
                    {
                        return(false);
                    }

                    for (int j = selectedStatements.EndIndex + 1; j < statements.Count; j++)
                    {
                        foreach (SyntaxNode node in statements[j].DescendantNodes())
                        {
                            if (node.IsKind(SyntaxKind.IdentifierName) &&
                                symbol.Equals(semanticModel.GetSymbol(node, cancellationToken)))
                            {
                                return(false);
                            }
                        }
                    }
                }
            }

            return(true);
        }
Esempio n. 5
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        public static ImmutableArray <IfRefactoring> Analyze(
            StatementsSelection selectedStatements,
            IfAnalysisOptions options,
            SemanticModel semanticModel,
            CancellationToken cancellationToken)
        {
            if (selectedStatements.Count != 2)
            {
                return(Empty);
            }

            StatementSyntax[] statements = selectedStatements.ToArray();

            StatementSyntax statement1 = statements[0];
            StatementSyntax statement2 = statements[1];

            if (statement1.ContainsDiagnostics)
            {
                return(Empty);
            }

            if (statement2.ContainsDiagnostics)
            {
                return(Empty);
            }

            SyntaxKind kind1 = statement1.Kind();
            SyntaxKind kind2 = statement2.Kind();

            if (kind1 == SyntaxKind.IfStatement)
            {
                if (kind2 == SyntaxKind.ReturnStatement)
                {
                    var ifStatement = (IfStatementSyntax)statement1;

                    if (ifStatement.IsSimpleIf())
                    {
                        return(Analyze(ifStatement, (ReturnStatementSyntax)statement2, options, semanticModel, cancellationToken));
                    }
                }
            }
            else if (options.UseConditionalExpression)
            {
                if (kind1 == SyntaxKind.LocalDeclarationStatement)
                {
                    if (kind2 == SyntaxKind.IfStatement)
                    {
                        return(Analyze((LocalDeclarationStatementSyntax)statement1, (IfStatementSyntax)statement2, options));
                    }
                }
                else if (kind1 == SyntaxKind.ExpressionStatement &&
                         kind2 == SyntaxKind.IfStatement)
                {
                    return(Analyze((ExpressionStatementSyntax)statement1, (IfStatementSyntax)statement2, options));
                }
            }

            return(Empty);
        }
Esempio n. 6
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 public static async Task ComputeRefactoringAsync(RefactoringContext context, BlockSyntax block)
 {
     if (SelectedStatementsRefactoring.IsAnyRefactoringEnabled(context) &&
         StatementsSelection.TryCreate(block, context.Span, out StatementsSelection selectedStatements))
     {
         await SelectedStatementsRefactoring.ComputeRefactoringAsync(context, selectedStatements).ConfigureAwait(false);
     }
 }
        public static async Task ComputeRefactoringAsync(RefactoringContext context, StatementsSelection selectedStatements)
        {
            if (!(selectedStatements.LastOrDefault() is WhileStatementSyntax whileStatement))
            {
                return;
            }

            if (selectedStatements.Count == 1)
            {
                context.RegisterRefactoring(
                    Title,
                    cancellationToken => RefactorAsync(context.Document, whileStatement, cancellationToken));
            }
            else
            {
                switch (selectedStatements.First().Kind())
                {
                case SyntaxKind.LocalDeclarationStatement:
                {
                    SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);

                    if (VerifyLocalDeclarationStatements(selectedStatements, semanticModel, context.CancellationToken))
                    {
                        List <LocalDeclarationStatementSyntax> localDeclarations = selectedStatements
                                                                                   .Take(selectedStatements.Count - 1)
                                                                                   .Cast <LocalDeclarationStatementSyntax>()
                                                                                   .ToList();

                        context.RegisterRefactoring(
                            Title,
                            cancellationToken => RefactorAsync(context.Document, whileStatement, localDeclarations, cancellationToken));
                    }

                    break;
                }

                case SyntaxKind.ExpressionStatement:
                {
                    if (VerifyExpressionStatements(selectedStatements))
                    {
                        List <ExpressionStatementSyntax> expressionStatements = selectedStatements
                                                                                .Take(selectedStatements.Count - 1)
                                                                                .Cast <ExpressionStatementSyntax>()
                                                                                .ToList();

                        context.RegisterRefactoring(
                            Title,
                            cancellationToken => RefactorAsync(context.Document, whileStatement, expressionStatements, cancellationToken));
                    }

                    break;
                }
                }
            }
        }
        public static void ComputeRefactorings(RefactoringContext context, StatementsSelection selectedStatements)
        {
            List <IfStatementSyntax> ifStatements = GetIfStatements(selectedStatements);

            if (ifStatements?.Count > 1)
            {
                context.RegisterRefactoring(
                    "Merge if statements",
                    cancellationToken =>
                {
                    return(RefactorAsync(
                               context.Document,
                               selectedStatements.Info,
                               ifStatements.ToImmutableArray(),
                               cancellationToken));
                });
            }
        }
        public static void ComputeRefactorings(RefactoringContext context, StatementsSelection selectedStatements)
        {
            using (IEnumerator <StatementSyntax> en = selectedStatements.GetEnumerator())
            {
                if (en.MoveNext() &&
                    en.Current.IsKind(SyntaxKind.ExpressionStatement))
                {
                    var statement = (ExpressionStatementSyntax)en.Current;

                    if (statement.Expression?.IsKind(SyntaxKind.SimpleAssignmentExpression) == true &&
                        en.MoveNext() &&
                        en.Current.IsKind(SyntaxKind.ReturnStatement))
                    {
                        var returnStatement = (ReturnStatementSyntax)en.Current;

                        if (returnStatement.Expression != null &&
                            !en.MoveNext())
                        {
                            var assignment = (AssignmentExpressionSyntax)statement.Expression;

                            if (assignment.Left?.IsMissing == false &&
                                assignment.Right?.IsMissing == false &&
                                SyntaxComparer.AreEquivalent(assignment.Left, returnStatement.Expression))
                            {
                                context.RegisterRefactoring(
                                    "Merge statements",
                                    cancellationToken =>
                                {
                                    return(RefactorAsync(
                                               context.Document,
                                               statement,
                                               returnStatement,
                                               cancellationToken));
                                });
                            }
                        }
                    }
                }
            }
        }
Esempio n. 10
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        public async Task ComputeRefactoringAsync(RefactoringContext context, StatementsSelection selectedStatements)
        {
            SingleLocalDeclarationStatementInfo localInfo = SyntaxInfo.SingleLocalDeclarationStatementInfo(selectedStatements.FirstOrDefault() as LocalDeclarationStatementSyntax);

            if (!localInfo.Success)
            {
                return;
            }

            ExpressionSyntax value = localInfo.Initializer?.Value;

            if (value == null)
            {
                return;
            }

            if (value.Kind() == SyntaxKind.DefaultExpression)
            {
                return;
            }

            if (value is LiteralExpressionSyntax)
            {
                return;
            }

            SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);

            var typeSymbol = semanticModel.GetTypeSymbol(localInfo.Type, context.CancellationToken) as INamedTypeSymbol;

            if (typeSymbol?.Implements(SpecialType.System_IDisposable) != true)
            {
                return;
            }

            context.RegisterRefactoring(
                $"Using '{localInfo.IdentifierText}'",
                cancellationToken => RefactorAsync(context.Document, selectedStatements, cancellationToken));
        }
        public Task <Document> RefactorAsync(
            Document document,
            StatementsSelection selectedStatements,
            CancellationToken cancellationToken = default(CancellationToken))
        {
            StatementsInfo statementsInfo = selectedStatements.Info;

            StatementSyntax[] statements = selectedStatements.ToArray();

            int index = selectedStatements.StartIndex;

            SyntaxTriviaList leadingTrivia  = statements[0].GetLeadingTrivia();
            SyntaxTriviaList trailingTrivia = statements[statements.Length - 1].GetTrailingTrivia();

            statements[0] = statements[0].WithLeadingTrivia();
            statements[statements.Length - 1] = statements[statements.Length - 1].WithTrailingTrivia();

            SyntaxList <StatementSyntax> newStatements = statementsInfo.Statements;

            int cnt = statements.Length;

            while (cnt > 0)
            {
                newStatements = newStatements.RemoveAt(index);
                cnt--;
            }

            TStatement statement = CreateStatement(statements.ToImmutableArray());

            statement = statement
                        .WithLeadingTrivia(leadingTrivia)
                        .WithTrailingTrivia(trailingTrivia)
                        .WithFormatterAnnotation();

            newStatements = newStatements.Insert(index, statement);

            return(document.ReplaceStatementsAsync(statementsInfo, newStatements, cancellationToken));
        }
        private static bool VerifyExpressionStatements(StatementsSelection selectedStatements)
        {
            for (int i = selectedStatements.StartIndex; i < selectedStatements.EndIndex; i++)
            {
                StatementSyntax statement = selectedStatements.Statements[i];

                if (!(statement is ExpressionStatementSyntax expressionStatement))
                {
                    return(false);
                }

                if (!CanBeInitializer(expressionStatement.Expression))
                {
                    return(false);
                }
            }

            return(true);

            bool CanBeInitializer(ExpressionSyntax expression)
            {
                switch (expression.Kind())
                {
                case SyntaxKind.SimpleAssignmentExpression:
                case SyntaxKind.InvocationExpression:
                case SyntaxKind.PreIncrementExpression:
                case SyntaxKind.PreDecrementExpression:
                case SyntaxKind.PostIncrementExpression:
                case SyntaxKind.PostDecrementExpression:
                case SyntaxKind.ObjectCreationExpression:
                case SyntaxKind.AwaitExpression:
                    return(true);

                default:
                    return(false);
                }
            }
        }
        private static Task <Document> RefactorAsync(
            Document document,
            IfStatementSyntax ifStatement,
            StatementsSelection selectedStatements,
            CancellationToken cancellationToken)
        {
            IfStatementInfo ifStatementInfo = SyntaxInfo.IfStatementInfo(ifStatement);

            StatementSyntax newStatement = null;

            if (selectedStatements.Count == 1 &&
                !ifStatementInfo.Nodes.Any(f => f.Statement?.IsKind(SyntaxKind.Block) == true))
            {
                newStatement = selectedStatements.First();
            }
            else
            {
                newStatement = SyntaxFactory.Block(selectedStatements);
            }

            ElseClauseSyntax elseClause = SyntaxFactory.ElseClause(newStatement).WithFormatterAnnotation();

            IfStatementSyntax lastIfStatement = ifStatementInfo.Nodes.Last();

            IfStatementSyntax newIfStatement = ifStatement.ReplaceNode(
                lastIfStatement,
                lastIfStatement.WithElse(elseClause));

            SyntaxList <StatementSyntax> newStatements = selectedStatements.Statements.Replace(ifStatement, newIfStatement);

            for (int i = newStatements.Count - 1; i >= selectedStatements.StartIndex; i--)
            {
                newStatements = newStatements.RemoveAt(i);
            }

            return(document.ReplaceStatementsAsync(selectedStatements.Info, newStatements, cancellationToken));
        }
        public static void ComputeRefactoring(RefactoringContext context, StatementsSelection selectedStatements)
        {
            StatementSyntax lastStatement = selectedStatements.Last();

            if (lastStatement.IsKind(SyntaxKind.ReturnStatement) &&
                selectedStatements.EndIndex == selectedStatements.Statements.IndexOf(lastStatement) &&
                selectedStatements.StartIndex > 0)
            {
                var returnStatement = (ReturnStatementSyntax)lastStatement;

                ExpressionSyntax expression = returnStatement.Expression;

                if (expression != null)
                {
                    StatementSyntax prevStatement = selectedStatements.Statements[selectedStatements.StartIndex - 1];

                    if (prevStatement.IsKind(SyntaxKind.IfStatement))
                    {
                        var ifStatement = (IfStatementSyntax)prevStatement;

                        IfStatementInfo ifStatementInfo = SyntaxInfo.IfStatementInfo(ifStatement);

                        if (ifStatementInfo.EndsWithIf &&
                            ifStatementInfo
                            .Nodes
                            .Where(f => f.IsIf)
                            .All(f => IsLastStatementReturnStatement(f)))
                        {
                            context.RegisterRefactoring(
                                "Wrap in else clause",
                                cancellationToken => RefactorAsync(context.Document, ifStatement, selectedStatements, cancellationToken));
                        }
                    }
                }
            }
        }
        public static async Task ComputeRefactoringAsync(RefactoringContext context, StatementsSelection selectedStatements)
        {
            if (selectedStatements.Any())
            {
                if (context.IsRefactoringEnabled(RefactoringIdentifiers.WrapInUsingStatement))
                {
                    var refactoring = new WrapStatements.WrapInUsingStatementRefactoring();
                    await refactoring.ComputeRefactoringAsync(context, selectedStatements).ConfigureAwait(false);
                }

                if (context.IsRefactoringEnabled(RefactoringIdentifiers.CollapseToInitializer))
                {
                    await CollapseToInitializerRefactoring.ComputeRefactoringsAsync(context, selectedStatements).ConfigureAwait(false);
                }

                if (context.IsRefactoringEnabled(RefactoringIdentifiers.MergeIfStatements))
                {
                    MergeIfStatementsRefactoring.ComputeRefactorings(context, selectedStatements);
                }

                if (context.IsAnyRefactoringEnabled(
                        RefactoringIdentifiers.UseCoalesceExpressionInsteadOfIf,
                        RefactoringIdentifiers.UseConditionalExpressionInsteadOfIf,
                        RefactoringIdentifiers.SimplifyIf))
                {
                    SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);

                    var options = new IfAnalysisOptions(
                        useCoalesceExpression: context.IsRefactoringEnabled(RefactoringIdentifiers.UseCoalesceExpressionInsteadOfIf),
                        useConditionalExpression: context.IsRefactoringEnabled(RefactoringIdentifiers.UseConditionalExpressionInsteadOfIf),
                        useBooleanExpression: context.IsRefactoringEnabled(RefactoringIdentifiers.SimplifyIf),
                        useExpression: false);

                    foreach (IfRefactoring refactoring in IfRefactoring.Analyze(selectedStatements, options, semanticModel, context.CancellationToken))
                    {
                        context.RegisterRefactoring(
                            refactoring.Title,
                            cancellationToken => refactoring.RefactorAsync(context.Document, cancellationToken));
                    }
                }

                if (context.IsRefactoringEnabled(RefactoringIdentifiers.MergeLocalDeclarations))
                {
                    await MergeLocalDeclarationsRefactoring.ComputeRefactoringsAsync(context, selectedStatements).ConfigureAwait(false);
                }

                if (context.IsRefactoringEnabled(RefactoringIdentifiers.MergeAssignmentExpressionWithReturnStatement))
                {
                    MergeAssignmentExpressionWithReturnStatementRefactoring.ComputeRefactorings(context, selectedStatements);
                }

                if (context.IsRefactoringEnabled(RefactoringIdentifiers.CheckExpressionForNull))
                {
                    await CheckExpressionForNullRefactoring.ComputeRefactoringAsync(context, selectedStatements).ConfigureAwait(false);
                }

                if (context.IsRefactoringEnabled(RefactoringIdentifiers.ReplaceWhileWithFor))
                {
                    await ReplaceWhileWithForRefactoring.ComputeRefactoringAsync(context, selectedStatements).ConfigureAwait(false);
                }

                if (context.IsRefactoringEnabled(RefactoringIdentifiers.WrapInElseClause))
                {
                    WrapInElseClauseRefactoring.ComputeRefactoring(context, selectedStatements);
                }

                if (context.IsRefactoringEnabled(RefactoringIdentifiers.WrapInCondition))
                {
                    context.RegisterRefactoring(
                        WrapInIfStatementRefactoring.Title,
                        cancellationToken =>
                    {
                        var refactoring = new WrapInIfStatementRefactoring();
                        return(refactoring.RefactorAsync(context.Document, selectedStatements, cancellationToken));
                    });
                }

                if (context.IsRefactoringEnabled(RefactoringIdentifiers.WrapInTryCatch))
                {
                    context.RegisterRefactoring(
                        WrapInTryCatchRefactoring.Title,
                        cancellationToken =>
                    {
                        var refactoring = new WrapInTryCatchRefactoring();
                        return(refactoring.RefactorAsync(context.Document, selectedStatements, cancellationToken));
                    });
                }
            }
        }
        public static async Task ComputeRefactoringsAsync(RefactoringContext context, StatementsSelection selectedStatements)
        {
            if (selectedStatements.Count > 1)
            {
                StatementSyntax firstStatement = selectedStatements.First();

                SemanticModel semanticModel = null;
                ISymbol       symbol        = null;
                ObjectCreationExpressionSyntax objectCreation = null;

                SyntaxKind kind = firstStatement.Kind();

                if (kind == SyntaxKind.LocalDeclarationStatement)
                {
                    var localDeclaration = (LocalDeclarationStatementSyntax)firstStatement;

                    VariableDeclaratorSyntax variable = localDeclaration
                                                        .Declaration?
                                                        .Variables
                                                        .SingleOrDefault(shouldthrow: false);

                    objectCreation = variable?.Initializer?.Value as ObjectCreationExpressionSyntax;

                    if (objectCreation != null)
                    {
                        semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);

                        symbol = semanticModel.GetDeclaredSymbol(variable, context.CancellationToken);
                    }
                }
                else if (kind == SyntaxKind.ExpressionStatement)
                {
                    var expressionStatement = (ExpressionStatementSyntax)firstStatement;

                    if (expressionStatement.Expression is AssignmentExpressionSyntax assignment)
                    {
                        objectCreation = assignment.Right as ObjectCreationExpressionSyntax;

                        if (objectCreation != null)
                        {
                            semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);

                            symbol = semanticModel.GetSymbol(assignment.Left, context.CancellationToken);
                        }
                    }
                }

                if (objectCreation != null &&
                    symbol?.IsErrorType() == false &&
                    selectedStatements
                    .Skip(1)
                    .All(f => IsValidAssignmentStatement(f, symbol, semanticModel, context.CancellationToken)))
                {
                    context.RegisterRefactoring(
                        "Collapse to initializer",
                        cancellationToken =>
                    {
                        return(RefactorAsync(
                                   context.Document,
                                   objectCreation,
                                   selectedStatements,
                                   cancellationToken));
                    });
                }
            }
        }
Esempio n. 17
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        public static async Task ComputeRefactoringsAsync(RefactoringContext context, SwitchSectionSyntax switchSection)
        {
            if (SelectedStatementsRefactoring.IsAnyRefactoringEnabled(context) &&
                StatementsSelection.TryCreate(switchSection, context.Span, out StatementsSelection selectedStatements))
            {
                await SelectedStatementsRefactoring.ComputeRefactoringAsync(context, selectedStatements).ConfigureAwait(false);
            }

            if (context.IsRefactoringEnabled(RefactoringIdentifiers.SplitSwitchLabels))
            {
                SplitSwitchLabelsRefactoring.ComputeRefactoring(context, switchSection);
            }

            if (context.Span.IsEmpty &&
                context.IsAnyRefactoringEnabled(
                    RefactoringIdentifiers.AddBracesToSwitchSection,
                    RefactoringIdentifiers.AddBracesToSwitchSections,
                    RefactoringIdentifiers.RemoveBracesFromSwitchSection,
                    RefactoringIdentifiers.RemoveBracesFromSwitchSections))
            {
                var switchStatement = (SwitchStatementSyntax)switchSection.Parent;

                SyntaxList <SwitchSectionSyntax> sections = switchStatement.Sections;

                switch (CSharpAnalysis.AnalyzeBraces(switchSection))
                {
                case BracesAnalysisResult.AddBraces:
                {
                    if (context.IsRefactoringEnabled(RefactoringIdentifiers.AddBracesToSwitchSection))
                    {
                        context.RegisterRefactoring(
                            AddBracesToSwitchSectionRefactoring.Title,
                            cancellationToken => AddBracesToSwitchSectionRefactoring.RefactorAsync(context.Document, switchSection, cancellationToken));
                    }

                    if (context.IsRefactoringEnabled(RefactoringIdentifiers.AddBracesToSwitchSections) &&
                        sections.Any(f => f != switchSection && AddBracesToSwitchSectionRefactoring.CanAddBraces(f)))
                    {
                        context.RegisterRefactoring(
                            AddBracesToSwitchSectionsRefactoring.Title,
                            cancellationToken => AddBracesToSwitchSectionsRefactoring.RefactorAsync(context.Document, switchStatement, null, cancellationToken));
                    }

                    break;
                }

                case BracesAnalysisResult.RemoveBraces:
                {
                    if (context.IsRefactoringEnabled(RefactoringIdentifiers.RemoveBracesFromSwitchSection))
                    {
                        context.RegisterRefactoring(
                            RemoveBracesFromSwitchSectionRefactoring.Title,
                            cancellationToken => RemoveBracesFromSwitchSectionRefactoring.RefactorAsync(context.Document, switchSection, cancellationToken));
                    }

                    if (context.IsRefactoringEnabled(RefactoringIdentifiers.RemoveBracesFromSwitchSections) &&
                        sections.Any(f => f != switchSection && RemoveBracesFromSwitchSectionRefactoring.CanRemoveBraces(f)))
                    {
                        context.RegisterRefactoring(
                            RemoveBracesFromSwitchSectionsRefactoring.Title,
                            cancellationToken => RemoveBracesFromSwitchSectionsRefactoring.RefactorAsync(context.Document, switchStatement, null, cancellationToken));
                    }

                    break;
                }
                }
            }
        }
        internal static async Task ComputeRefactoringAsync(RefactoringContext context, StatementsSelection selectedStatements)
        {
            if (selectedStatements.Count <= 1)
            {
                return;
            }

            StatementSyntax statement = selectedStatements.First();

            SyntaxKind kind = statement.Kind();

            if (kind == SyntaxKind.LocalDeclarationStatement)
            {
                var localDeclaration = (LocalDeclarationStatementSyntax)statement;

                SingleLocalDeclarationStatementInfo localInfo = SyntaxInfo.SingleLocalDeclarationStatementInfo(localDeclaration);

                SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);

                if (!CanRefactor(localInfo, semanticModel, context.CancellationToken))
                {
                    return;
                }

                RegisterRefactoring(context, IdentifierName(localInfo.Identifier), localDeclaration, selectedStatements.Count - 1);
            }
            else if (kind == SyntaxKind.ExpressionStatement)
            {
                var expressionStatement = (ExpressionStatementSyntax)statement;

                SimpleAssignmentStatementInfo assignmentInfo = SyntaxInfo.SimpleAssignmentStatementInfo(expressionStatement);

                SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);

                if (!CanRefactor(assignmentInfo, assignmentInfo.Left, semanticModel, context.CancellationToken))
                {
                    return;
                }

                RegisterRefactoring(context, assignmentInfo.Left, expressionStatement, selectedStatements.Count - 1);
            }
        }
        public static async Task ComputeRefactoringsAsync(RefactoringContext context, StatementsSelection selectedStatements)
        {
            if (selectedStatements.Count > 1)
            {
                SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);

                if (AreLocalDeclarations(selectedStatements, semanticModel, context.CancellationToken))
                {
                    context.RegisterRefactoring(
                        "Merge local declarations",
                        cancellationToken =>
                    {
                        return(RefactorAsync(
                                   context.Document,
                                   selectedStatements.Info,
                                   selectedStatements.Cast <LocalDeclarationStatementSyntax>().ToArray(),
                                   cancellationToken));
                    });
                }
            }
        }