public IndentationResult? GetDesiredIndentation(Document document, int lineNumber, CancellationToken cancellationToken)
{
var root = document.GetSyntaxRootSynchronously(cancellationToken);
var sourceText = root.SyntaxTree.GetText(cancellationToken);
var documentOptions = document.GetOptionsAsync(cancellationToken).WaitAndGetResult(cancellationToken);
var lineToBeIndented = sourceText.Lines[lineNumber];
var formattingRules = GetFormattingRules(document, lineToBeIndented.Start);
// enter on a token case.
if (ShouldUseSmartTokenFormatterInsteadOfIndenter(formattingRules, root, lineToBeIndented, documentOptions, cancellationToken))
{
return null;
}
var indenter = GetIndenter(
document.GetLanguageService<ISyntaxFactsService>(),
root.SyntaxTree, lineToBeIndented, formattingRules,
documentOptions, cancellationToken);
return indenter.GetDesiredIndentation();
}
/// <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.GetOptionsAsync(cancellationToken).WaitAndGetResult_Venus(cancellationToken),
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());
}
internal static async Task<Document> FormatAsync(Document document, SyntaxAnnotation annotation, OptionSet options, IEnumerable<IFormattingRule> rules, CancellationToken cancellationToken)
{
if (document == null)
{
throw new ArgumentNullException(nameof(document));
}
if (annotation == null)
{
throw new ArgumentNullException(nameof(annotation));
}
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var documentOptions = options ?? await document.GetOptionsAsync(cancellationToken).ConfigureAwait(false);
return document.WithSyntaxRoot(await FormatAsync(root, annotation, document.Project.Solution.Workspace, documentOptions, rules, cancellationToken).ConfigureAwait(false));
}