private void SplitOutMultiLineTriviaAndAddSpacing(
IReadOnlyList <SyntaxTrivia> trivia,
TokenSpacingPolicy spacingPolicy,
out SyntaxAnnotation multiLineAnnotation,
out SyntaxTriviaList leadingTrivia)
{
for (var i = trivia.Count - 1; i >= 0; --i)
{
if (RoslynHelpers.IsMultiLine(trivia[i]))
{
multiLineAnnotation = LayoutAnnotations.CreateMultiLineTriviaAnnotation(trivia.Take(i + 1));
// if we have no more trivia after the multi-line trivia, then leading is empty. If we have
// additional trivial, leading is that trivia plus a space
leadingTrivia = trivia.Count > i + 1
? SyntaxFactory.TriviaList(trivia.Skip(i + 1).Concat(SingleWhitespaceList))
: SyntaxTriviaList.Empty;
return;
}
}
multiLineAnnotation = null;
leadingTrivia = trivia.Count > 0 ? SyntaxFactory.TriviaList(trivia.Concat(SingleWhitespaceList))
: (spacingPolicy & TokenSpacingPolicy.NeedsWhitespace) == TokenSpacingPolicy.NeedsWhitespace ? SingleWhitespaceList
: SyntaxTriviaList.Empty;
}
private void MergeNewLines(List <SyntaxTrivia> buffer, TokenSpacingPolicy spacingPolicy, bool hadTrailingTrivia)
{
// if we have only one trivia entry, either:
// (1) it's a newline, in which case we can remove it unless it followed some trailing trivia
// (2) it's not a newline, in which case nothing will be removed so just return
if (buffer.Count == 1)
{
if (!hadTrailingTrivia && buffer[0].IsKind(SyntaxKind.EndOfLineTrivia))
{
buffer.Clear();
}
return;
}
var newLineStart = -1;
for (var i = 0; i <= buffer.Count; ++i)
{
if (i < buffer.Count && buffer[i].IsKind(SyntaxKind.EndOfLineTrivia))
{
if (newLineStart < 0)
{
newLineStart = i;
}
}
else if (newLineStart >= 0)
{
// if we find more than the allowed # of newlines in a row, remove all but the first # allowed
var allowedNewLines = (newLineStart == 0 && (spacingPolicy | TokenSpacingPolicy.BanMultipleTrailingNewLines) == TokenSpacingPolicy.BanMultipleTrailingNewLines) ? 1
: (i == buffer.Count && (spacingPolicy | TokenSpacingPolicy.BanMultipleLeadingNewLines) == TokenSpacingPolicy.BanMultipleLeadingNewLines) ? 1
: 2;
var count = i - newLineStart;
if (count > allowedNewLines)
{
buffer.RemoveRange(newLineStart + allowedNewLines, count: count - allowedNewLines);
i = newLineStart + allowedNewLines;
}
newLineStart = -1;
}
}
}
