private static TextSpan?GetEmptyLineSpan(
SyntaxTriviaList triviaList,
bool isEnd)
{
SyntaxTriviaList.Enumerator en = triviaList.GetEnumerator();
while (en.MoveNext())
{
switch (en.Current.Kind())
{
case SyntaxKind.EndOfLineTrivia:
{
SyntaxTrivia endOfLine = en.Current;
if (isEnd)
{
while (en.MoveNext())
{
if (!en.Current.IsWhitespaceOrEndOfLineTrivia())
{
return(null);
}
}
}
return(TextSpan.FromBounds(triviaList.Span.Start, endOfLine.Span.End));
}
case SyntaxKind.WhitespaceTrivia:
{
break;
}
default:
{
return(null);
}
}
}
return(null);
}
private static bool IsOnEmptyLine(TextSpan span, SyntaxTriviaList leadingTrivia)
{
SyntaxTriviaList.Enumerator en = leadingTrivia.GetEnumerator();
while (en.MoveNext())
{
if (en.Current.Span.Contains(span))
{
if (en.Current.IsEndOfLineTrivia())
{
return(true);
}
return(en.Current.IsWhitespaceTrivia() &&
en.MoveNext() &&
en.Current.IsEndOfLineTrivia());
}
}
return(false);
}
private static bool IsStandardTriviaBetweenLines(SyntaxTriviaList trailingTrivia, SyntaxTriviaList leadingTrivia)
{
if (leadingTrivia.Any()
&& leadingTrivia.All(f => f.IsWhitespaceTrivia()))
{
SyntaxTriviaList.Enumerator en = trailingTrivia.GetEnumerator();
while (en.MoveNext())
{
SyntaxKind kind = en.Current.Kind();
if (kind == SyntaxKind.WhitespaceTrivia)
continue;
return kind == SyntaxKind.EndOfLineTrivia
&& !en.MoveNext();
}
}
return false;
}
public static Task <Document> RemoveEmptyLinesBeforeAsync(
Document document,
SyntaxToken token,
CancellationToken cancellationToken = default)
{
SyntaxTriviaList leadingTrivia = token.LeadingTrivia;
int count = 0;
SyntaxTriviaList.Enumerator en = leadingTrivia.GetEnumerator();
while (en.MoveNext())
{
if (en.Current.IsWhitespaceTrivia())
{
if (!en.MoveNext())
{
break;
}
if (!en.Current.IsEndOfLineTrivia())
{
break;
}
count += 2;
}
else if (en.Current.IsEndOfLineTrivia())
{
count++;
}
else
{
break;
}
}
SyntaxToken newToken = token.WithLeadingTrivia(leadingTrivia.RemoveRange(0, count));
return(document.ReplaceTokenAsync(token, newToken, cancellationToken));
}
