public sealed override async Task ComputeRefactoringsAsync(CodeRefactoringContext context)
{
// TODO: Replace the following code with your own analysis, generating a CodeAction for each refactoring to offer
var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
// Find the node at the selection.
var node = root.FindNode(context.Span);
var navigator = new NodeNavigator(node);
// Only offer a refactoring if the selected node is a type declaration node.
var expr =
navigator.FindInAncestors<ObjectCreationExpressionSyntax>() ??
navigator.FindInDescendents<ObjectCreationExpressionSyntax>().FirstOrDefault();
if (expr == null) return;
// For any type declaration node, create a code action to reverse the identifier text.
// var action = CodeAction.Create("Reverse type name", c => ReverseTypeNameAsync(context.Document, typeDecl, c));
// Register this code action.
// context.RegisterRefactoring(action);
}
public void NodeNavigator_Selection_FindInParents_ClassDeclarationSyntax_ReturnsNull(string code, int selectionStart, int selectionLength)
{
// Arrange
var tree = CSharpSyntaxTree.ParseText(code);
var root = tree.GetCompilationUnitRoot();
var selection = root.FindNode(new TextSpan(selectionStart, selectionLength));
var nn = new NodeNavigator(selection);
// Act
var node = nn.FindInAncestors<ClassDeclarationSyntax>();
// Assert
Assert.AreEqual("C", node.Identifier.Text);
}
