private static async Task HandleSingleTypeAsync(CompletionContext context, SemanticModel semanticModel, SyntaxToken token, ITypeSymbol type, CancellationToken cancellationToken)
{
// If we have a Nullable<T>, unwrap it.
if (type.OriginalDefinition.SpecialType == SpecialType.System_Nullable_T)
{
var typeArg = type.GetTypeArguments().FirstOrDefault();
if (typeArg == null)
{
return;
}
type = typeArg;
}
// When true, this completion provider shows both the type (e.g. DayOfWeek) and its qualified members (e.g.
// DayOfWeek.Friday). We set this to false for enum-like cases (static members of structs and classes) so we
// only show the qualified members in these cases.
var showType = true;
var position = context.Position;
var enclosingNamedType = semanticModel.GetEnclosingNamedType(position, cancellationToken);
if (type.TypeKind != TypeKind.Enum)
{
var enumType = TryGetEnumTypeInEnumInitializer(semanticModel, token, type, cancellationToken) ??
TryGetCompletionListType(type, enclosingNamedType, semanticModel.Compilation);
if (enumType == null)
{
if (context.Trigger.Kind == CompletionTriggerKind.Insertion && s_triggerCharacters.Contains(context.Trigger.Character))
{
// This completion provider understands static members of matching types, but doesn't
// proactively trigger completion for them to avoid interfering with common typing patterns.
return;
}
// If this isn't an enum or marked with completionlist, also check if it contains static members of
// a matching type. These 'enum-like' types have similar characteristics to enum completion, but do
// not show the containing type as a separate item in completion.
showType = false;
enumType = TryGetTypeWithStaticMembers(type);
if (enumType == null)
{
return;
}
}
type = enumType;
}
var hideAdvancedMembers = context.CompletionOptions.HideAdvancedMembers;
if (!type.IsEditorBrowsable(hideAdvancedMembers, semanticModel.Compilation))
{
return;
}
// Does type have any aliases?
var alias = await type.FindApplicableAliasAsync(position, semanticModel, cancellationToken).ConfigureAwait(false);
var displayText = alias != null
? alias.Name
: type.ToMinimalDisplayString(semanticModel, position);
// Add the enum itself.
var symbol = alias ?? type;
var sortText = symbol.Name;
if (showType)
{
context.AddItem(SymbolCompletionItem.CreateWithSymbolId(
displayText,
displayTextSuffix: "",
symbols: ImmutableArray.Create(symbol),
rules: s_enumTypeRules,
contextPosition: position,
sortText: sortText));
}
// And now all the accessible members of the enum.
if (type.TypeKind == TypeKind.Enum)
{
// We'll want to build a list of the actual enum members and all accessible instances of that enum, too
var index = 0;
var fields = type.GetMembers().OfType <IFieldSymbol>().Where(f => f.IsConst).Where(f => f.HasConstantValue);
foreach (var field in fields.OrderBy(f => IntegerUtilities.ToInt64(f.ConstantValue)))
{
index++;
if (!field.IsEditorBrowsable(hideAdvancedMembers, semanticModel.Compilation))
{
continue;
}
var memberDisplayName = $"{displayText}.{field.Name}";
context.AddItem(SymbolCompletionItem.CreateWithSymbolId(
displayText: memberDisplayName,
displayTextSuffix: "",
symbols: ImmutableArray.Create <ISymbol>(field),
rules: CompletionItemRules.Default,
contextPosition: position,
sortText: $"{sortText}_{index:0000}",
filterText: memberDisplayName));
}
}
else if (enclosingNamedType is not null)
{
// Build a list of the members with the same type as the target
foreach (var member in type.GetMembers())
{
ISymbol staticSymbol;
ITypeSymbol symbolType;
if (member is IFieldSymbol {
IsStatic: true
} field)
{
staticSymbol = field;
symbolType = field.Type;
}
else if (member is IPropertySymbol {
IsStatic: true, IsIndexer: false
} property)
{
staticSymbol = property;
symbolType = property.Type;
}
