public static FormattingSuggestion AnalyzeNewLineBeforeOrAfter(
SyntaxNodeAnalysisContext context,
SyntaxToken token,
ExpressionSyntax expression,
AnalyzerOptionDescriptor afterDescriptor)
{
SyntaxToken previousToken = token.GetPreviousToken();
if (SyntaxTriviaAnalysis.IsEmptyOrSingleWhitespaceTrivia(previousToken.TrailingTrivia))
{
if (!token.LeadingTrivia.Any() &&
SyntaxTriviaAnalysis.IsOptionalWhitespaceThenEndOfLineTrivia(token.TrailingTrivia) &&
SyntaxTriviaAnalysis.IsEmptyOrSingleWhitespaceTrivia(expression.GetLeadingTrivia()) &&
!afterDescriptor.IsEnabled(context))
{
return(FormattingSuggestion.AddNewLineBefore);
}
}
else if (SyntaxTriviaAnalysis.IsOptionalWhitespaceThenEndOfLineTrivia(previousToken.TrailingTrivia))
{
if (SyntaxTriviaAnalysis.IsEmptyOrSingleWhitespaceTrivia(token.LeadingTrivia) &&
SyntaxTriviaAnalysis.IsEmptyOrSingleWhitespaceTrivia(token.TrailingTrivia) &&
!expression.GetLeadingTrivia().Any() &&
afterDescriptor.IsEnabled(context))
{
return(FormattingSuggestion.AddNewLineAfter);
}
}
return(FormattingSuggestion.None);
}
private static void Analyze(
SyntaxNodeAnalysisContext context,
SyntaxToken token,
SyntaxNode node,
AnalyzerOptionDescriptor obsoleteAnalyzerOption = default)
{
SyntaxTriviaList trailingTrivia = token.TrailingTrivia;
SyntaxTriviaList leadingTrivia = node.GetLeadingTrivia();
if (IsStandardTriviaBetweenLines(trailingTrivia, leadingTrivia))
{
return;
}
if (token
.SyntaxTree
.GetLineSpan(TextSpan.FromBounds(token.Span.End, node.SpanStart), context.CancellationToken)
.GetLineCount() != 3)
{
return;
}
var trivia = default(SyntaxTrivia);
foreach (SyntaxTrivia t in leadingTrivia)
{
if (!t.IsWhitespaceTrivia())
{
trivia = t;
break;
}
}
if (!trivia.IsEndOfLineTrivia())
{
return;
}
if (!trailingTrivia.IsEmptyOrWhitespace())
{
return;
}
if (!leadingTrivia.IsEmptyOrWhitespace())
{
return;
}
Location location = Location.Create(token.SyntaxTree, TextSpan.FromBounds(node.FullSpan.Start, trivia.Span.End));
if (obsoleteAnalyzerOption.IsDefault)
{
DiagnosticHelpers.ReportDiagnostic(context, DiagnosticRules.RemoveRedundantEmptyLine, location);
}
else
{
DiagnosticHelpers.ReportDiagnostic(context, DiagnosticRules.RemoveRedundantEmptyLine, location, obsoleteAnalyzerOption);
}
}