Document PerformAction(Document document, SemanticModel model, SyntaxNode root, PropertyDeclarationSyntax propertyDeclaration, bool needsSetter)
{
AccessorDeclarationSyntax accessor = null;
PropertyDeclarationSyntax newProp = null;
if (needsSetter)
{
accessor = SyntaxFactory.AccessorDeclaration(SyntaxKind.SetAccessorDeclaration);
var getter = propertyDeclaration.AccessorList.Accessors.FirstOrDefault(m => m.IsKind(SyntaxKind.GetAccessorDeclaration));
if (getter == null)
{
//get;
accessor = accessor.WithSemicolonToken(SyntaxFactory.Token(SyntaxKind.SemicolonToken));
}
else
{
var getField = ReplacePropertyWithBackingFieldWithAutoPropertyCodeRefactoringProvider.ScanGetter(model, getter);
if (getField == null && getter.Body == null)
{
//get;
accessor = accessor.WithSemicolonToken(SyntaxFactory.Token(SyntaxKind.SemicolonToken)).WithTrailingTrivia(getter.GetTrailingTrivia());
}
else if (getField == null || getField.IsReadOnly)
{
//readonly or no field can be found
accessor = accessor.WithBody(GetNotImplementedBlock());
}
else
{
//now we add a 'field = value'.
accessor = accessor.WithBody(SyntaxFactory.Block(
SyntaxFactory.ExpressionStatement(
SyntaxFactory.AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, SyntaxFactory.IdentifierName(getField.Name), SyntaxFactory.IdentifierName("value")))));
}
}
newProp = propertyDeclaration.WithAccessorList(propertyDeclaration.AccessorList.AddAccessors(accessor));
}
else
{
accessor = SyntaxFactory.AccessorDeclaration(SyntaxKind.GetAccessorDeclaration);
var setter = propertyDeclaration.AccessorList.Accessors.FirstOrDefault(m => m.IsKind(SyntaxKind.SetAccessorDeclaration));
var accessorDeclList = new SyntaxList <AccessorDeclarationSyntax>();
if (setter == null)
{
//set;
accessor = accessor.WithSemicolonToken(SyntaxFactory.Token(SyntaxKind.SemicolonToken));
}
else
{
var setField = ReplacePropertyWithBackingFieldWithAutoPropertyCodeRefactoringProvider.ScanSetter(model, setter);
if (setField == null && setter.Body == null)
{
//set;
accessor = accessor.WithSemicolonToken(SyntaxFactory.Token(SyntaxKind.SemicolonToken)).WithTrailingTrivia(setter.GetTrailingTrivia());
}
else if (setField == null)
{
//no field can be found
accessor = accessor.WithBody(GetNotImplementedBlock());
}
else
{
//now we add a 'return field;'.
accessor = accessor.WithBody(SyntaxFactory.Block(
SyntaxFactory.ReturnStatement(SyntaxFactory.IdentifierName(setField.Name))));
}
accessorDeclList = accessorDeclList.Add(propertyDeclaration.AccessorList.Accessors.First(m => m.IsKind(SyntaxKind.SetAccessorDeclaration)));
}
accessorDeclList = accessorDeclList.Insert(0, accessor);
var accessorList = SyntaxFactory.AccessorList(accessorDeclList);
newProp = propertyDeclaration.WithAccessorList(accessorList);
}
var newRoot = root.ReplaceNode((SyntaxNode)propertyDeclaration, newProp).WithAdditionalAnnotations(Formatter.Annotation);
return(document.WithSyntaxRoot(newRoot));
}
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 property = root.FindNode(span) as PropertyDeclarationSyntax;
if (property == null || !property.Identifier.Span.Contains(span))
{
return;
}
var field = ReplacePropertyWithBackingFieldWithAutoPropertyCodeRefactoringProvider.GetBackingField(model, property);
if (field == null)
{
return;
}
var type = property.Parent as TypeDeclarationSyntax;
if (type == null)
{
return;
}
var resolvedType = model.Compilation.GetTypeSymbol("System", "EventHandler", 0, cancellationToken);
if (resolvedType == null)
{
return;
}
context.RegisterRefactoring(
CodeActionFactory.Create(
span,
DiagnosticSeverity.Info,
GettextCatalog.GetString("Create changed event"),
t2 =>
{
var eventDeclaration = CreateChangedEventDeclaration(property);
var methodDeclaration = CreateEventInvocatorCodeRefactoringProvider.CreateEventInvocator(
document,
type.Identifier.ToString(),
type.Modifiers.Any(m => m.IsKind(SyntaxKind.SealedKeyword)),
eventDeclaration.Modifiers.Any(m => m.IsKind(SyntaxKind.StaticKeyword)),
eventDeclaration.Declaration.Variables.First().Identifier.ToString(),
resolvedType.GetDelegateInvokeMethod(),
false
);
var invocation = SyntaxFactory.ExpressionStatement(SyntaxFactory.InvocationExpression(
SyntaxFactory.IdentifierName(methodDeclaration.Identifier.ToString()),
SyntaxFactory.ArgumentList(SyntaxFactory.SeparatedList <ArgumentSyntax>(new[] { SyntaxFactory.Argument(SyntaxFactory.ParseExpression("System.EventArgs.Empty")) }))
));
var marker = new SyntaxAnnotation();
var newRoot = root.ReplaceNode(property, property.WithAdditionalAnnotations(marker));
newRoot = newRoot.InsertNodesAfter(newRoot.GetAnnotatedNodes(marker).First(), new SyntaxNode[] {
methodDeclaration.WithAdditionalAnnotations(Formatter.Annotation),
eventDeclaration.WithAdditionalAnnotations(Formatter.Annotation)
});
newRoot = newRoot.InsertNodesAfter(newRoot.GetAnnotatedNodes(marker).OfType <PropertyDeclarationSyntax>().First().AccessorList.Accessors.First(a => a.IsKind(SyntaxKind.SetAccessorDeclaration)).Body.Statements.Last(),
new[] { invocation.WithAdditionalAnnotations(Formatter.Annotation, Simplifier.Annotation) }
);
return(Task.FromResult(document.WithSyntaxRoot(newRoot)));
})
);
}