private bool TryGetTextForSymbol(SyntaxToken token, SemanticModel semanticModel, Document document, CancellationToken cancellationToken, out string text)
{
ISymbol symbol;
if (token.Parent is TypeArgumentListSyntax)
{
var genericName = token.GetAncestor<GenericNameSyntax>();
symbol = semanticModel.GetSymbolInfo(genericName, cancellationToken).Symbol ?? semanticModel.GetTypeInfo(genericName, cancellationToken).Type;
}
else if (token.Parent is NullableTypeSyntax && token.IsKind(SyntaxKind.QuestionToken))
{
text = "System.Nullable`1";
return true;
}
else
{
symbol = semanticModel.GetSemanticInfo(token, document.Project.Solution.Workspace, cancellationToken)
.GetAnySymbol(includeType: true);
if (symbol == null)
{
var bindableParent = document.GetLanguageService<ISyntaxFactsService>().GetBindableParent(token);
var overloads = semanticModel.GetMemberGroup(bindableParent);
symbol = overloads.FirstOrDefault();
}
}
// Local: return the name if it's the declaration, otherwise the type
if (symbol is ILocalSymbol && !symbol.DeclaringSyntaxReferences.Any(d => d.GetSyntax().DescendantTokens().Contains(token)))
{
symbol = ((ILocalSymbol)symbol).Type;
}
// Range variable: use the type
if (symbol is IRangeVariableSymbol)
{
var info = semanticModel.GetTypeInfo(token.Parent, cancellationToken);
symbol = info.Type;
}
// Just use syntaxfacts for operators
if (symbol is IMethodSymbol && ((IMethodSymbol)symbol).MethodKind == MethodKind.BuiltinOperator)
{
text = null;
return false;
}
text = symbol != null ? FormatSymbol(symbol) : null;
return symbol != null;
}