private static bool TryGetReceiverTypeSymbol(
SyntaxContext syntaxContext,
ISyntaxFactsService syntaxFacts,
CancellationToken cancellationToken,
[NotNullWhen(true)] out ITypeSymbol?receiverTypeSymbol)
{
var parentNode = syntaxContext.TargetToken.Parent;
// Even though implicit access to extension method is allowed, we decide not support it for simplicity
// e.g. we will not provide completion for unimported extension method in this case
// New Bar() {.X = .$$ }
var expressionNode = syntaxFacts.GetLeftSideOfDot(parentNode, allowImplicitTarget: false);
if (expressionNode != null)
{
// Check if we are accessing members of a type, no extension methods are exposed off of types.
if (syntaxContext.SemanticModel.GetSymbolInfo(expressionNode, cancellationToken).GetAnySymbol() is not ITypeSymbol)
{
// The expression we're calling off of needs to have an actual instance type.
// We try to be more tolerant to errors here so completion would still be available in certain case of partially typed code.
receiverTypeSymbol = syntaxContext.SemanticModel.GetTypeInfo(expressionNode, cancellationToken).Type;
if (receiverTypeSymbol is IErrorTypeSymbol errorTypeSymbol)
{
receiverTypeSymbol = errorTypeSymbol.CandidateSymbols.Select(GetSymbolType).FirstOrDefault(s => s != null);
}
return(receiverTypeSymbol != null);
}
}
receiverTypeSymbol = null;
return(false);
}