public static async Task<ISymbol> FindApplicableAlias(this ITypeSymbol type, int position, SemanticModel semanticModel, CancellationToken cancellationToken)
{
try
{
if (semanticModel.IsSpeculativeSemanticModel)
{
position = semanticModel.OriginalPositionForSpeculation;
semanticModel = semanticModel.ParentModel;
}
var root = await semanticModel.SyntaxTree.GetRootAsync(cancellationToken).ConfigureAwait(false);
IEnumerable<UsingDirectiveSyntax> applicableUsings = GetApplicableUsings(position, root as CompilationUnitSyntax);
foreach (var applicableUsing in applicableUsings)
{
var alias = semanticModel.GetOriginalSemanticModel().GetDeclaredSymbol(applicableUsing, cancellationToken);
if (alias != null && alias.Target == type)
{
return alias;
}
}
return null;
}
catch (Exception e) when (FatalError.ReportUnlessCanceled(e))
{
throw ExceptionUtilities.Unreachable;
}
}
public static async Task<ISymbol> FindApplicableAlias(this ITypeSymbol type, int position, SemanticModel semanticModel, CancellationToken cancellationToken)
{
var token = semanticModel.SyntaxTree.FindTokenOnLeftOfPosition(position, cancellationToken);
var declaration = token.GetAncestor<MemberDeclarationSyntax>();
if (declaration != null)
{
position = declaration.SpanStart;
}
var root = await semanticModel.GetOriginalSemanticModel().SyntaxTree.GetRootAsync(cancellationToken).ConfigureAwait(false);
IEnumerable<UsingDirectiveSyntax> applicableUsings = GetApplicableUsings(position, root as CompilationUnitSyntax);
foreach (var applicableUsing in applicableUsings)
{
var alias = semanticModel.GetOriginalSemanticModel().GetDeclaredSymbol(applicableUsing, cancellationToken);
if (alias != null && alias.Target == type)
{
return alias;
}
}
return null;
}