static bool TryCheckIncrementOrDecrement(AssignmentExpressionSyntax node, out AssignmentExpressionSyntax updatedNode)
{
updatedNode = ReplaceWithOperatorAssignmentCodeRefactoringProvider.CreateAssignment(node) ?? node;
if ((!updatedNode.IsKind(SyntaxKind.AddAssignmentExpression) && !updatedNode.IsKind(SyntaxKind.SubtractAssignmentExpression)))
{
return(false);
}
if (!(updatedNode.Right is LiteralExpressionSyntax rightLiteral))
{
return(false);
}
return(rightLiteral.Token.Value is 1);
}
public override async Task ComputeRefactoringsAsync(CodeRefactoringContext context)
{
var document = context.Document;
if (document.Project.Solution.Workspace.Kind == WorkspaceKind.MiscellaneousFiles)
{
return;
}
var span = context.Span;
if (!span.IsEmpty)
{
return;
}
var cancellationToken = context.CancellationToken;
if (cancellationToken.IsCancellationRequested)
{
return;
}
var model = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
if (model.IsFromGeneratedCode(cancellationToken))
{
return;
}
var root = await model.SyntaxTree.GetRootAsync(cancellationToken).ConfigureAwait(false);
var token = root.FindToken(span.Start);
var node = token.Parent as AssignmentExpressionSyntax;
if (node == null || !node.OperatorToken.Span.Contains(span))
{
return;
}
var updatedNode = ReplaceWithOperatorAssignmentCodeRefactoringProvider.CreateAssignment(node) ?? node;
if ((!updatedNode.IsKind(SyntaxKind.AddAssignmentExpression) && !updatedNode.IsKind(SyntaxKind.SubtractAssignmentExpression)))
{
return;
}
var rightLiteral = updatedNode.Right as LiteralExpressionSyntax;
if (rightLiteral == null || ((int)rightLiteral.Token.Value) != 1)
{
return;
}
context.RegisterRefactoring(
CodeActionFactory.Create(
token.Span,
DiagnosticSeverity.Info,
updatedNode.IsKind(SyntaxKind.AddAssignmentExpression) ? GettextCatalog.GetString("To '{0}++'") : GettextCatalog.GetString("To '{0}--'"),
t2 =>
{
var newNode = SyntaxFactory.PostfixUnaryExpression(updatedNode.IsKind(SyntaxKind.AddAssignmentExpression) ? SyntaxKind.PostIncrementExpression : SyntaxKind.PostDecrementExpression, updatedNode.Left);
var newRoot = root.ReplaceNode((SyntaxNode)node, newNode.WithAdditionalAnnotations(Formatter.Annotation).WithLeadingTrivia(node.GetLeadingTrivia()));
return(Task.FromResult(document.WithSyntaxRoot(newRoot)));
}
)
);
}
