protected override int GetAdjustedContextPoint(int contextPoint, Document document)
{
// Determine the position in the buffer at which to end the tracking span representing
// the part of the imaginary buffer before the text in the view.
var tree = document.GetSyntaxTreeSynchronously(CancellationToken.None);
var token = tree.FindTokenOnLeftOfPosition(contextPoint, CancellationToken.None);
// Special case to handle class designer because it asks for debugger IntelliSense using
// spans between members.
if (contextPoint > token.Span.End &&
token.IsKindOrHasMatchingText(SyntaxKind.CloseBraceToken) &&
token.Parent.IsKind(SyntaxKind.Block) &&
token.Parent.Parent is MemberDeclarationSyntax)
{
return contextPoint;
}
if (token.IsKindOrHasMatchingText(SyntaxKind.CloseBraceToken) &&
token.Parent.IsKind(SyntaxKind.Block))
{
return token.SpanStart;
}
return token.FullSpan.End;
}
public static string CreateUniqueEventName(
Document document, string className, string objectName, string nameOfEvent, CancellationToken cancellationToken)
{
var type = document.Project.GetCompilationAsync(cancellationToken).WaitAndGetResult_Venus(cancellationToken).GetTypeByMetadataName(className);
var name = objectName + "_" + nameOfEvent;
var semanticModel = document.GetSemanticModelAsync(cancellationToken).WaitAndGetResult_Venus(cancellationToken);
var tree = document.GetSyntaxTreeSynchronously(cancellationToken);
var typeNode = type.DeclaringSyntaxReferences.Where(r => r.SyntaxTree == tree).Select(r => r.GetSyntax(cancellationToken)).First();
var codeModel = document.Project.LanguageServices.GetService<ICodeModelNavigationPointService>();
var point = codeModel.GetStartPoint(typeNode, EnvDTE.vsCMPart.vsCMPartBody);
var reservedNames = semanticModel.LookupSymbols(point.Value.Position, type).Select(m => m.Name);
return NameGenerator.EnsureUniqueness(name, reservedNames, document.Project.LanguageServices.GetService<ISyntaxFactsService>().IsCaseSensitive);
}
protected override int GetContainingClassName(Document document, SnapshotSpan fieldSpan, CancellationToken cancellationToken, ref string value, ref int hasDefaultValue)
{
// Find the nearest enclosing type declaration and use its name
var syntaxTree = document.GetSyntaxTreeSynchronously(cancellationToken);
var type = syntaxTree.FindTokenOnLeftOfPosition(fieldSpan.Start.Position, cancellationToken).GetAncestor<TypeDeclarationSyntax>();
if (type != null)
{
value = type.Identifier.ToString();
if (!string.IsNullOrWhiteSpace(value))
{
hasDefaultValue = 1;
}
}
return VSConstants.S_OK;
}
private static ISymbol GetEventSymbol(
Document document, string objectTypeName, string nameOfEvent, INamedTypeSymbol type, CancellationToken cancellationToken)
{
var compilation = document.Project.GetCompilationAsync(cancellationToken).WaitAndGetResult_Venus(cancellationToken);
var semanticModel = document.GetSemanticModelAsync(cancellationToken).WaitAndGetResult_Venus(cancellationToken);
var objectType = compilation.GetTypeByMetadataName(objectTypeName);
if (objectType == null)
{
throw new InvalidOperationException();
}
var containingTree = document.GetSyntaxTreeSynchronously(cancellationToken);
var typeLocation = type.Locations.FirstOrDefault(d => d.SourceTree == containingTree);
if (typeLocation == null)
{
throw new InvalidOperationException();
}
return semanticModel.LookupSymbols(typeLocation.SourceSpan.Start, objectType, nameOfEvent).SingleOrDefault(m => m.Kind == SymbolKind.Event);
}
/// <summary>
/// Ensure that an event handler exists for a given event.
/// </summary>
/// <param name="thisDocument">The document corresponding to this operation.</param>
/// <param name="targetDocument">The document to generate the event handler in if it doesn't
/// exist.</param>
/// <param name="className">The name of the type to generate the event handler in.</param>
/// <param name="objectName">The name of the event member (if <paramref
/// name="useHandlesClause"/> is true)</param>
/// <param name="objectTypeName">The name of the type containing the event.</param>
/// <param name="nameOfEvent">The name of the event member in <paramref
/// name="objectTypeName"/></param>
/// <param name="eventHandlerName">The name of the method to be hooked up to the
/// event.</param>
/// <param name="itemidInsertionPoint">The VS itemid of the file to generate the event
/// handler in.</param>
/// <param name="useHandlesClause">If true, a vb "Handles" clause will be generated for the
/// handler.</param>
/// <param name="additionalFormattingRule">An additional formatting rule that can be used to
/// format the newly inserted method</param>
/// <param name="cancellationToken">Cancellation token.</param>
/// <returns>Either the unique id of the method if it already exists, or the unique id of
/// the to be generated method, the text of the to be generated method, and the position in
/// <paramref name="itemidInsertionPoint"/> where the text should be inserted.</returns>
public static Tuple<string, string, VsTextSpan> EnsureEventHandler(
Document thisDocument,
Document targetDocument,
string className,
string objectName,
string objectTypeName,
string nameOfEvent,
string eventHandlerName,
uint itemidInsertionPoint,
bool useHandlesClause,
IFormattingRule additionalFormattingRule,
CancellationToken cancellationToken)
{
var thisCompilation = thisDocument.Project.GetCompilationAsync(cancellationToken).WaitAndGetResult_Venus(cancellationToken);
var type = thisCompilation.GetTypeByMetadataName(className);
var existingEventHandlers = GetCompatibleEventHandlers(targetDocument, className, objectTypeName, nameOfEvent, cancellationToken);
var existingHandler = existingEventHandlers.SingleOrDefault(e => e.Item1 == eventHandlerName);
if (existingHandler != null)
{
return Tuple.Create(existingHandler.Item2, (string)null, default(VsTextSpan));
}
// Okay, it doesn't exist yet. Let's create it.
var codeGenerationService = targetDocument.GetLanguageService<ICodeGenerationService>();
var syntaxFactory = targetDocument.GetLanguageService<SyntaxGenerator>();
var eventMember = GetEventSymbol(thisDocument, objectTypeName, nameOfEvent, type, cancellationToken);
if (eventMember == null)
{
throw new InvalidOperationException();
}
var eventType = ((IEventSymbol)eventMember).Type;
if (eventType.Kind != SymbolKind.NamedType || ((INamedTypeSymbol)eventType).DelegateInvokeMethod == null)
{
throw new InvalidOperationException(ServicesVSResources.Event_type_is_invalid);
}
var handlesExpressions = useHandlesClause ?
new[]
{
syntaxFactory.MemberAccessExpression(
objectName != null ? syntaxFactory.IdentifierName(objectName) : syntaxFactory.ThisExpression(),
syntaxFactory.IdentifierName(nameOfEvent))
}
: null;
var invokeMethod = ((INamedTypeSymbol)eventType).DelegateInvokeMethod;
var newMethod = CodeGenerationSymbolFactory.CreateMethodSymbol(
attributes: null,
accessibility: Accessibility.Protected,
modifiers: new DeclarationModifiers(),
returnType: targetDocument.Project.GetCompilationAsync(cancellationToken).WaitAndGetResult_Venus(cancellationToken).GetSpecialType(SpecialType.System_Void),
explicitInterfaceSymbol: null,
name: eventHandlerName,
typeParameters: null,
parameters: invokeMethod.Parameters.ToArray(),
statements: null,
handlesExpressions: handlesExpressions);
var annotation = new SyntaxAnnotation();
newMethod = annotation.AddAnnotationToSymbol(newMethod);
var codeModel = targetDocument.Project.LanguageServices.GetService<ICodeModelNavigationPointService>();
var syntaxFacts = targetDocument.Project.LanguageServices.GetService<ISyntaxFactsService>();
var targetSyntaxTree = targetDocument.GetSyntaxTreeSynchronously(cancellationToken);
var position = type.Locations.First(loc => loc.SourceTree == targetSyntaxTree).SourceSpan.Start;
var destinationType = syntaxFacts.GetContainingTypeDeclaration(targetSyntaxTree.GetRoot(cancellationToken), position);
var insertionPoint = codeModel.GetEndPoint(destinationType, EnvDTE.vsCMPart.vsCMPartBody);
if (insertionPoint == null)
{
throw new InvalidOperationException(ServicesVSResources.Can_t_find_where_to_insert_member);
}
var newType = codeGenerationService.AddMethod(destinationType, newMethod, new CodeGenerationOptions(autoInsertionLocation: false), cancellationToken);
var newRoot = targetSyntaxTree.GetRoot(cancellationToken).ReplaceNode(destinationType, newType);
newRoot = Simplifier.ReduceAsync(
targetDocument.WithSyntaxRoot(newRoot), Simplifier.Annotation, null, cancellationToken).WaitAndGetResult_Venus(cancellationToken).GetSyntaxRootSynchronously(cancellationToken);
var formattingRules = additionalFormattingRule.Concat(Formatter.GetDefaultFormattingRules(targetDocument));
newRoot = Formatter.FormatAsync(
newRoot,
Formatter.Annotation,
targetDocument.Project.Solution.Workspace,
targetDocument.Options,
formattingRules,
cancellationToken).WaitAndGetResult_Venus(cancellationToken);
var newMember = newRoot.GetAnnotatedNodesAndTokens(annotation).Single();
var newMemberText = newMember.ToFullString();
// In VB, the final newline is likely a statement terminator in the parent - just add
// one on so that things don't get messed.
if (!newMemberText.EndsWith(Environment.NewLine, StringComparison.Ordinal))
{
newMemberText += Environment.NewLine;
}
return Tuple.Create(ConstructMemberId(newMethod), newMemberText, insertionPoint.Value.ToVsTextSpan());
}