/// <summary>
/// Searches for types that match the name the user has written. Returns <see cref="SymbolReference"/>s
/// to the <see cref="INamespaceSymbol"/>s or <see cref="INamedTypeSymbol"/>s those types are
/// contained in.
/// </summary>
private async Task <ImmutableArray <SymbolReference> > GetReferencesForMatchingTypesAsync(SearchScope searchScope)
{
searchScope.CancellationToken.ThrowIfCancellationRequested();
if (!_owner.CanAddImportForType(_diagnosticId, _node, out var nameNode))
{
return(ImmutableArray <SymbolReference> .Empty);
}
CalculateContext(
nameNode, _syntaxFacts,
out var name, out var arity, out var inAttributeContext,
out var hasIncompleteParentMember, out var looksGeneric);
if (ExpressionBinds(nameNode, checkForExtensionMethods: false, cancellationToken: searchScope.CancellationToken))
{
// If the expression bound, there's nothing to do.
return(ImmutableArray <SymbolReference> .Empty);
}
var symbols = await searchScope.FindDeclarationsAsync(name, nameNode, SymbolFilter.Type).ConfigureAwait(false);
// also lookup type symbols with the "Attribute" suffix if necessary.
if (inAttributeContext)
{
var attributeSymbols = await searchScope.FindDeclarationsAsync(name + AttributeSuffix, nameNode, SymbolFilter.Type).ConfigureAwait(false);
symbols = symbols.AddRange(
attributeSymbols.Select(r => r.WithDesiredName(r.DesiredName.GetWithoutAttributeSuffix(isCaseSensitive: false))));
}
var typeSymbols = OfType <ITypeSymbol>(symbols);
// Only keep symbols which are accessible from the current location.
var accessibleTypeSymbols = typeSymbols.WhereAsArray(
s => ArityAccessibilityAndAttributeContextAreCorrect(
s.Symbol, arity, inAttributeContext,
hasIncompleteParentMember, looksGeneric));
// These types may be contained within namespaces, or they may be nested
// inside generic types. Record these namespaces/types if it would be
// legal to add imports for them.
var typesContainedDirectlyInNamespaces = accessibleTypeSymbols.WhereAsArray(s => s.Symbol.ContainingSymbol is INamespaceSymbol);
var typesContainedDirectlyInTypes = accessibleTypeSymbols.WhereAsArray(s => s.Symbol.ContainingType != null);
var namespaceReferences = GetNamespaceSymbolReferences(searchScope,
typesContainedDirectlyInNamespaces.SelectAsArray(r => r.WithSymbol(r.Symbol.ContainingNamespace)));
var typeReferences = typesContainedDirectlyInTypes.SelectAsArray(
r => searchScope.CreateReference(r.WithSymbol(r.Symbol.ContainingType)));
return(namespaceReferences.Concat(typeReferences));
}
