internal static void LookupSymbolInUsings(
ImmutableArray <NamespaceOrTypeAndUsingDirective> usings,
LookupResult result,
LookupConstraints constraints)
{
if (constraints.OriginalBinder.Flags.Includes(BinderFlags.InScriptUsing))
{
return;
}
bool callerIsSemanticModel = constraints.OriginalBinder.IsSemanticModelBinder;
foreach (var typeOrNamespace in usings)
{
ImmutableArray <Symbol> candidates = Binder.GetCandidateMembers(constraints.WithQualifier(typeOrNamespace.NamespaceOrType));
foreach (Symbol symbol in candidates)
{
if (!IsValidLookupCandidateInUsings(symbol))
{
continue;
}
// Found a match in our list of normal using directives. Mark the directive
// as being seen so that it won't be reported to the user as something that
// can be removed.
var res = constraints.OriginalBinder.CheckViability(symbol, constraints.WithAccessThroughType(null));
if (res.Kind == LookupResultKind.Viable)
{
MarkImportDirective(constraints.OriginalBinder.Compilation, typeOrNamespace.UsingDirective.SyntaxNode, callerIsSemanticModel);
}
result.MergeEqual(res);
}
}
}
internal void LookupSymbolInAliases(LookupResult result, LookupConstraints constraints)
{
bool callerIsSemanticModel = constraints.OriginalBinder.IsSemanticModelBinder;
AliasAndUsingDirective alias;
if (this.UsingAliases.TryGetValue(constraints.Name, out alias))
{
// Found a match in our list of normal aliases. Mark the alias as being seen so that
// it won't be reported to the user as something that can be removed.
var res = constraints.OriginalBinder.CheckViability(alias.Alias, constraints.WithAccessThroughType(null));
if (res.Kind == LookupResultKind.Viable)
{
MarkImportDirective(alias.UsingDirective, callerIsSemanticModel);
}
result.MergeEqual(res);
}
foreach (var a in this.ExternAliases)
{
if (a.Alias.Name == constraints.Name)
{
// Found a match in our list of extern aliases. Mark the extern alias as being
// seen so that it won't be reported to the user as something that can be
// removed.
var res = constraints.OriginalBinder.CheckViability(a.Alias, constraints.WithAccessThroughType(null));
if (res.Kind == LookupResultKind.Viable)
{
MarkImportDirective(a.ExternAliasDirective, callerIsSemanticModel);
}
result.MergeEqual(res);
}
}
}
private static void AddAliasSymbolToResult(LookupSymbolsInfo result, AliasSymbol aliasSymbol, LookupConstraints constraints)
{
var targetSymbol = aliasSymbol.GetAliasTarget(basesBeingResolved: null);
if (constraints.OriginalBinder.CanAddLookupSymbolInfo(targetSymbol, result, constraints.WithAccessThroughType(null), aliasSymbol: aliasSymbol))
{
result.AddSymbol(aliasSymbol, aliasSymbol.Name, aliasSymbol.Name);
}
}
