private bool TryGetStringLiteralToken(SyntaxTree tree, int position, out SyntaxToken stringLiteral, CancellationToken cancellationToken)
{
if (tree.IsEntirelyWithinStringLiteral(position, cancellationToken))
{
var token = tree.GetRoot(cancellationToken).FindToken(position, findInsideTrivia: true);
if (token.Kind() == SyntaxKind.EndOfDirectiveToken || token.Kind() == SyntaxKind.EndOfFileToken)
{
token = token.GetPreviousToken(includeSkipped: true, includeDirectives: true);
}
if (token.Kind() == SyntaxKind.StringLiteralToken &&
token.Parent.Kind() == SyntaxKind.ReferenceDirectiveTrivia)
{
stringLiteral = token;
return true;
}
}
stringLiteral = default(SyntaxToken);
return false;
}