public static async Task <Document> RefactorAsync(
Document document,
ConditionalExpressionSyntax conditionalExpression,
CancellationToken cancellationToken)
{
SemanticModel semanticModel = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
ExpressionSyntax condition = conditionalExpression.Condition;
ExpressionSyntax newNode = (conditionalExpression.WhenTrue.WalkDownParentheses().IsKind(SyntaxKind.TrueLiteralExpression))
? condition
: LogicalNegationHelper.LogicallyNegate(condition, semanticModel, cancellationToken);
SyntaxTriviaList trailingTrivia = conditionalExpression
.DescendantTrivia(TextSpan.FromBounds(condition.Span.End, conditionalExpression.Span.End))
.ToSyntaxTriviaList()
.EmptyIfWhitespace()
.AddRange(conditionalExpression.GetTrailingTrivia());
newNode = newNode
.WithLeadingTrivia(conditionalExpression.GetLeadingTrivia())
.WithTrailingTrivia(trailingTrivia);
return(await document.ReplaceNodeAsync(conditionalExpression, newNode, cancellationToken).ConfigureAwait(false));
}
public static async Task <Document> RefactorAsync(
Document document,
ConditionalExpressionSyntax conditionalExpression,
CancellationToken cancellationToken)
{
ExpressionSyntax condition = conditionalExpression.Condition;
ExpressionSyntax newNode = (conditionalExpression.WhenTrue.IsKind(SyntaxKind.TrueLiteralExpression))
? condition
: Negator.LogicallyNegate(condition);
TextSpan span = TextSpan.FromBounds(
conditionalExpression.Condition.Span.End,
conditionalExpression.FullSpan.End);
IEnumerable <SyntaxTrivia> trivia = conditionalExpression.DescendantTrivia(span);
if (trivia.Any(f => !f.IsWhitespaceOrEndOfLineTrivia()))
{
newNode = newNode.WithTrailingTrivia(trivia);
}
else
{
newNode = newNode.WithoutTrailingTrivia();
}
return(await document.ReplaceNodeAsync(conditionalExpression, newNode, cancellationToken).ConfigureAwait(false));
}
public static async Task ComputeRefactoringsAsync(RefactoringContext context, ConditionalExpressionSyntax conditionalExpression)
{
if (context.Span.IsEmptyAndContainedInSpanOrBetweenSpans(conditionalExpression))
{
if (context.IsRefactoringEnabled(RefactoringIdentifiers.FormatConditionalExpression))
{
if (conditionalExpression.IsSingleLine())
{
context.RegisterRefactoring(
"Format ?: on separate lines",
ct => SyntaxFormatter.ToMultiLineAsync(context.Document, conditionalExpression, ct),
RefactoringIdentifiers.FormatConditionalExpression);
}
else if (conditionalExpression.DescendantTrivia(conditionalExpression.Span).All(f => f.IsWhitespaceOrEndOfLineTrivia()))
{
context.RegisterRefactoring(
"Format ?: on a single line",
ct => SyntaxFormatter.ToSingleLineAsync(context.Document, conditionalExpression, ct),
RefactoringIdentifiers.FormatConditionalExpression);
}
}
if (context.IsRefactoringEnabled(RefactoringIdentifiers.ConvertConditionalOperatorToIfElse))
{
SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);
(CodeAction codeAction, CodeAction recursiveCodeAction) = ConvertConditionalOperatorToIfElseRefactoring.ComputeRefactoring(
context.Document,
conditionalExpression,
new CodeActionData(ConvertConditionalOperatorToIfElseRefactoring.Title, RefactoringIdentifiers.ConvertConditionalOperatorToIfElse),
new CodeActionData(ConvertConditionalOperatorToIfElseRefactoring.RecursiveTitle, ConvertConditionalOperatorToIfElseRecursiveEquivalenceKey),
semanticModel,
context.CancellationToken);
if (codeAction != null)
{
context.RegisterRefactoring(codeAction);
}
if (recursiveCodeAction != null)
{
context.RegisterRefactoring(recursiveCodeAction);
}
}
}
if (context.IsRefactoringEnabled(RefactoringIdentifiers.InvertConditionalExpression) &&
(context.Span.IsBetweenSpans(conditionalExpression) ||
context.Span.IsEmptyAndContainedInSpan(conditionalExpression.QuestionToken, conditionalExpression.ColonToken)) &&
InvertConditionalExpressionRefactoring.CanRefactor(conditionalExpression))
{
context.RegisterRefactoring(
"Invert ?:",
ct => InvertConditionalExpressionRefactoring.RefactorAsync(context.Document, conditionalExpression, ct),
RefactoringIdentifiers.InvertConditionalExpression);
}
}
public static void Analyze(SyntaxNodeAnalysisContext context, ConditionalExpressionSyntax conditionalExpression)
{
if (conditionalExpression.Condition?.IsMissing == false &&
CanBeReplacedWithCoalesceExpression(conditionalExpression) &&
conditionalExpression
.DescendantTrivia(conditionalExpression.Span)
.All(f => f.IsWhitespaceOrEndOfLineTrivia()))
{
context.ReportDiagnostic(
DiagnosticDescriptors.UseCoalesceExpressionInsteadOfConditionalExpression,
conditionalExpression);
}
}
public static void Analyze(SyntaxNodeAnalysisContext context, ConditionalExpressionSyntax conditionalExpression)
{
if (!conditionalExpression.ContainsDiagnostics &&
IsFixable(conditionalExpression, context.SemanticModel, context.CancellationToken) &&
conditionalExpression
.DescendantTrivia(conditionalExpression.Span)
.All(f => f.IsWhitespaceOrEndOfLineTrivia()))
{
context.ReportDiagnostic(
DiagnosticDescriptors.UseCoalesceExpressionInsteadOfConditionalExpression,
conditionalExpression);
}
}
private static ExpressionSyntax CreateNewNode(
ConditionalExpressionSyntax conditionalExpression,
ExpressionSyntax newNode)
{
SyntaxTriviaList trailingTrivia = conditionalExpression
.DescendantTrivia(TextSpan.FromBounds(conditionalExpression.Condition.Span.End, conditionalExpression.Span.End))
.ToSyntaxTriviaList()
.EmptyIfWhitespace()
.AddRange(conditionalExpression.GetTrailingTrivia());
return(newNode
.WithLeadingTrivia(conditionalExpression.GetLeadingTrivia())
.WithTrailingTrivia(trailingTrivia)
.WithSimplifierAnnotation());
}
public static async Task ComputeRefactoringsAsync(RefactoringContext context, ConditionalExpressionSyntax conditionalExpression)
{
if (context.Span.IsEmptyAndContainedInSpanOrBetweenSpans(conditionalExpression))
{
if (context.IsRefactoringEnabled(RefactoringIdentifiers.FormatConditionalExpression))
{
if (conditionalExpression.IsSingleLine())
{
context.RegisterRefactoring(
"Format ?: on separate lines",
ct => SyntaxFormatter.ToMultiLineAsync(context.Document, conditionalExpression, ct),
RefactoringIdentifiers.FormatConditionalExpression);
}
else if (conditionalExpression.DescendantTrivia(conditionalExpression.Span).All(f => f.IsWhitespaceOrEndOfLineTrivia()))
{
context.RegisterRefactoring(
"Format ?: on a single line",
ct => SyntaxFormatter.ToSingleLineAsync(context.Document, conditionalExpression, ct),
RefactoringIdentifiers.FormatConditionalExpression);
}
}
if (context.IsRefactoringEnabled(RefactoringIdentifiers.ReplaceConditionalExpressionWithIfElse))
{
await ReplaceConditionalExpressionWithIfElseRefactoring.ComputeRefactoringAsync(context, conditionalExpression).ConfigureAwait(false);
}
}
if (context.IsRefactoringEnabled(RefactoringIdentifiers.SwapExpressionsInConditionalExpression) &&
(context.Span.IsBetweenSpans(conditionalExpression) ||
context.Span.IsEmptyAndContainedInSpan(conditionalExpression.QuestionToken, conditionalExpression.ColonToken)) &&
SwapExpressionsInConditionalExpressionRefactoring.CanRefactor(conditionalExpression))
{
context.RegisterRefactoring(
"Swap expressions in ?:",
ct => SwapExpressionsInConditionalExpressionRefactoring.RefactorAsync(context.Document, conditionalExpression, ct),
RefactoringIdentifiers.SwapExpressionsInConditionalExpression);
}
}
