public static Task <Document> RefactorAsync(
Document document,
InterpolatedStringExpressionSyntax interpolatedString,
TextSpan span,
bool addNameOf = false,
CancellationToken cancellationToken = default(CancellationToken))
{
string s = interpolatedString.ToString();
int startIndex = span.Start - interpolatedString.SpanStart;
var sb = new StringBuilder();
sb.Append(s, 0, startIndex);
sb.Append('{');
if (addNameOf)
{
string identifier = StringLiteralParser.Parse(
s,
startIndex,
span.Length,
isVerbatim: interpolatedString.IsVerbatim(),
isInterpolatedText: true);
sb.Append(CSharpFactory.NameOfExpression(identifier));
}
int closeBracePosition = sb.Length;
sb.Append('}');
startIndex += span.Length;
sb.Append(s, startIndex, s.Length - startIndex);
ExpressionSyntax newNode = ParseExpression(sb.ToString()).WithTriviaFrom(interpolatedString);
SyntaxToken closeBrace = newNode.FindToken(closeBracePosition);
newNode = newNode.ReplaceToken(closeBrace, closeBrace.WithNavigationAnnotation());
return(document.ReplaceNodeAsync(interpolatedString, newNode, cancellationToken));
}