private (SyntaxTriviaList trailingTrivia, SyntaxTriviaList leadingTrivia) GetTrailingAndLeadingTrivia(
KeyValuePair <ValueTuple <SyntaxToken, SyntaxToken>,
TriviaData> pair,
CancellationToken cancellationToken)
{
if (pair.Key.Item1.RawKind == 0)
{
return(default(SyntaxTriviaList), GetLeadingTriviaAtBeginningOfTree(pair.Key, pair.Value, cancellationToken));
}
if (pair.Value is TriviaDataWithList csharpTriviaData)
{
var triviaList = csharpTriviaData.GetTriviaList(cancellationToken);
var index = GetFirstEndOfLineIndexOrRightBeforeComment(triviaList);
return(TriviaHelpers.CreateTriviaListFromTo(triviaList, 0, index),
TriviaHelpers.CreateTriviaListFromTo(triviaList, index + 1, triviaList.Count - 1));
}
// whitespace trivia case such as spaces/tabs/new lines
// these will always have a single text change
var text = pair.Value.GetTextChanges(GetTextSpan(pair.Key)).Single().NewText ?? "";
var trailingTrivia = SyntaxFactory.ParseTrailingTrivia(text);
var width = trailingTrivia.GetFullWidth();
var leadingTrivia = SyntaxFactory.ParseLeadingTrivia(text.Substring(width));
return(trailingTrivia, leadingTrivia);
}
