private bool TryGoToImplementations(IEnumerable <ISymbol> candidateImplementations, SymbolMappingResult mapping, CancellationToken cancellationToken, out string message)
{
var implementations = candidateImplementations
.Where(s => !s.IsAbstract && s.Locations.Any(l => l.IsInSource))
.ToList();
if (implementations.Count == 0)
{
message = EditorFeaturesResources.SymbolHasNoImplementations;
return(false);
}
else if (implementations.Count == 1)
{
GoToDefinition.GoToDefinitionHelpers.TryGoToDefinition(implementations.Single(), mapping.Project, _externalDefinitionProviders, _navigableItemPresenters, cancellationToken);
message = null;
return(true);
}
else
{
// We have multiple symbols, so we'll build a list of all preferred locations for all the symbols
var navigableItems = implementations.SelectMany(
implementation => CreateItemsForImplementation(implementation, mapping.Solution));
var presenter = _navigableItemPresenters.First();
presenter.Value.DisplayResult(NavigableItemFactory.GetSymbolDisplayString(mapping.Project, mapping.Symbol), navigableItems);
message = null;
return(true);
}
}
private bool TryGoToImplementations(SymbolMappingResult mapping, IList <ISymbol> implementations, CancellationToken cancellationToken, out string message)
{
if (implementations.Count == 0)
{
message = EditorFeaturesResources.SymbolHasNoImplementations;
return(false);
}
else if (implementations.Count == 1)
{
GoToDefinition.GoToDefinitionHelpers.TryGoToDefinition(implementations.Single(), mapping.Project, _navigableItemPresenters, cancellationToken);
message = null;
return(true);
}
else
{
// We have multiple symbols, so we'll build a list of all preferred locations for all the symbols
var navigableItems = implementations.SelectMany(
implementation => CreateItemsForImplementation(implementation, mapping.Solution));
var presenter = _navigableItemPresenters.First();
presenter.Value.DisplayResult(NavigableItemFactory.GetSymbolDisplayString(mapping.Project, mapping.Symbol), navigableItems);
message = null;
return(true);
}
}
public static bool TryGoToDefinition(
ISymbol symbol,
Project project,
IEnumerable <Lazy <INavigableItemsPresenter> > presenters,
CancellationToken cancellationToken,
bool thirdPartyNavigationAllowed = true,
bool throwOnHiddenDefinition = false)
{
var alias = symbol as IAliasSymbol;
if (alias != null)
{
var ns = alias.Target as INamespaceSymbol;
if (ns != null && ns.IsGlobalNamespace)
{
return(false);
}
}
// VB global import aliases have a synthesized SyntaxTree.
// We can't go to the definition of the alias, so use the target type.
var solution = project.Solution;
if (symbol is IAliasSymbol &&
NavigableItemFactory.GetPreferredSourceLocations(solution, symbol).All(l => project.Solution.GetDocument(l.SourceTree) == null))
{
symbol = ((IAliasSymbol)symbol).Target;
}
var definition = SymbolFinder.FindSourceDefinitionAsync(symbol, solution, cancellationToken).WaitAndGetResult(cancellationToken);
cancellationToken.ThrowIfCancellationRequested();
symbol = definition ?? symbol;
if (thirdPartyNavigationAllowed && TryThirdPartyNavigation(symbol, solution))
{
return(true);
}
// If it is a partial method declaration with no body, choose to go to the implementation
// that has a method body.
if (symbol is IMethodSymbol)
{
symbol = ((IMethodSymbol)symbol).PartialImplementationPart ?? symbol;
}
var preferredSourceLocations = NavigableItemFactory.GetPreferredSourceLocations(solution, symbol).ToArray();
if (!preferredSourceLocations.Any())
{
// If there are no visible source locations, then tell the host about the symbol and
// allow it to navigate to it. THis will either navigate to any non-visible source
// locations, or it can appropriately deal with metadata symbols for hosts that can go
// to a metadata-as-source view.
var symbolNavigationService = solution.Workspace.Services.GetService <ISymbolNavigationService>();
return(symbolNavigationService.TryNavigateToSymbol(symbol, project, cancellationToken: cancellationToken, usePreviewTab: true));
}
// If we have a single location, then just navigate to it.
if (preferredSourceLocations.Length == 1)
{
var firstItem = preferredSourceLocations[0];
var workspace = project.Solution.Workspace;
var navigationService = workspace.Services.GetService <IDocumentNavigationService>();
if (navigationService.CanNavigateToSpan(workspace, solution.GetDocument(firstItem.SourceTree).Id, firstItem.SourceSpan))
{
return(navigationService.TryNavigateToSpan(workspace, solution.GetDocument(firstItem.SourceTree).Id, firstItem.SourceSpan, usePreviewTab: true));
}
else
{
if (throwOnHiddenDefinition)
{
const int E_FAIL = -2147467259;
throw new COMException(EditorFeaturesResources.TheDefinitionOfTheObjectIsHidden, E_FAIL);
}
else
{
return(false);
}
}
}
else
{
// We have multiple viable source locations, so ask the host what to do. Most hosts
// will simply display the results to the user and allow them to choose where to
// go.
if (presenters.Any())
{
presenters.First().Value.DisplayResult(NavigableItemFactory.GetSymbolDisplayString(project, symbol),
preferredSourceLocations.Select(location => NavigableItemFactory.GetItemFromSymbolLocation(solution, symbol, location)).ToList());
return(true);
}
return(false);
}
}
public static bool TryGoToDefinition(
ISymbol symbol,
Project project,
IEnumerable <Lazy <INavigableDefinitionProvider> > externalDefinitionProviders,
IEnumerable <Lazy <INavigableItemsPresenter> > presenters,
CancellationToken cancellationToken,
bool thirdPartyNavigationAllowed = true,
bool throwOnHiddenDefinition = false)
{
var alias = symbol as IAliasSymbol;
if (alias != null)
{
var ns = alias.Target as INamespaceSymbol;
if (ns != null && ns.IsGlobalNamespace)
{
return(false);
}
}
// VB global import aliases have a synthesized SyntaxTree.
// We can't go to the definition of the alias, so use the target type.
var solution = project.Solution;
if (symbol is IAliasSymbol &&
NavigableItemFactory.GetPreferredSourceLocations(solution, symbol).All(l => project.Solution.GetDocument(l.SourceTree) == null))
{
symbol = ((IAliasSymbol)symbol).Target;
}
var definition = SymbolFinder.FindSourceDefinitionAsync(symbol, solution, cancellationToken).WaitAndGetResult(cancellationToken);
cancellationToken.ThrowIfCancellationRequested();
symbol = definition ?? symbol;
if (thirdPartyNavigationAllowed && TryThirdPartyNavigation(symbol, solution))
{
return(true);
}
// If it is a partial method declaration with no body, choose to go to the implementation
// that has a method body.
if (symbol is IMethodSymbol)
{
symbol = ((IMethodSymbol)symbol).PartialImplementationPart ?? symbol;
}
var options = project.Solution.Options;
var preferredSourceLocations = NavigableItemFactory.GetPreferredSourceLocations(solution, symbol).ToArray();
var title = NavigableItemFactory.GetSymbolDisplayString(project, symbol);
if (!preferredSourceLocations.Any())
{
// Attempt to find source locations from external definition providers.
if (thirdPartyNavigationAllowed && externalDefinitionProviders.Any())
{
var externalSourceDefinitions = FindExternalDefinitionsAsync(symbol, project, externalDefinitionProviders, cancellationToken).WaitAndGetResult(cancellationToken).ToImmutableArray();
if (externalSourceDefinitions.Length > 0)
{
return(TryGoToDefinition(externalSourceDefinitions, title, options, presenters, throwOnHiddenDefinition));
}
}
// If there are no visible source locations, then tell the host about the symbol and
// allow it to navigate to it. This will either navigate to any non-visible source
// locations, or it can appropriately deal with metadata symbols for hosts that can go
// to a metadata-as-source view.
var symbolNavigationService = solution.Workspace.Services.GetService <ISymbolNavigationService>();
return(symbolNavigationService.TryNavigateToSymbol(
symbol, project,
options: options.WithChangedOption(NavigationOptions.PreferProvisionalTab, true),
cancellationToken: cancellationToken));
}
var navigableItems = preferredSourceLocations.Select(location => NavigableItemFactory.GetItemFromSymbolLocation(solution, symbol, location)).ToImmutableArray();
return(TryGoToDefinition(navigableItems, title, options, presenters, throwOnHiddenDefinition));
}
