private static void HandleSingleLineComment(SyntaxTreeAnalysisContext context, SyntaxTrivia singleLineComment)
{
int index = 0;
// PERF: Explicitly cast to IReadOnlyList so we only box once.
IReadOnlyList <SyntaxTrivia> list = TriviaHelper.GetContainingTriviaList(singleLineComment, out index);
var firstNonWhiteSpace = TriviaHelper.IndexOfFirstNonWhitespaceTrivia(list);
// When we encounter a block of single line comments, we only want to raise this diagnostic
// on the first or last line. This ensures that whitespace in code commented out using
// the Comment Selection option in Visual Studio will not raise the diagnostic for every
// blank line in the code which is commented out.
bool isFirst = index == firstNonWhiteSpace;
if (!isFirst)
{
// This is -2 because we need to go back past the end of line trivia as well.
var lastNonWhiteSpace = TriviaHelper.IndexOfTrailingWhitespace(list) - 2;
if (index != lastNonWhiteSpace)
{
return;
}
}
if (IsNullOrWhiteSpace(singleLineComment.ToString(), 2))
{
var diagnostic = Diagnostic.Create(Descriptor, singleLineComment.GetLocation());
context.ReportDiagnostic(diagnostic);
}
}
private static SyntaxToken StripViolatingWhitespace(SyntaxToken token)
{
SyntaxToken result = token;
var trailingWhitespaceIndex = TriviaHelper.IndexOfTrailingWhitespace(token.LeadingTrivia);
if (trailingWhitespaceIndex != -1)
{
var newTriviaList = SyntaxFactory.TriviaList(token.LeadingTrivia.Take(trailingWhitespaceIndex));
result = token.WithLeadingTrivia(newTriviaList);
}
return(result);
}
private static void HandleSyntaxTreeAction(SyntaxTreeAnalysisContext context)
{
var lastToken = context.Tree.GetRoot().GetLastToken(includeZeroWidth: true);
if (lastToken.HasLeadingTrivia)
{
var leadingTrivia = lastToken.LeadingTrivia;
var trailingWhitespaceIndex = TriviaHelper.IndexOfTrailingWhitespace(leadingTrivia);
if (trailingWhitespaceIndex != -1)
{
var textSpan = TextSpan.FromBounds(leadingTrivia[trailingWhitespaceIndex].SpanStart, leadingTrivia[leadingTrivia.Count - 1].Span.End);
context.ReportDiagnostic(Diagnostic.Create(Descriptor, Location.Create(context.Tree, textSpan)));
}
}
}
private static SyntaxNode GetReplacement(ParenthesizedExpressionSyntax oldNode)
{
var leadingTrivia = SyntaxFactory.TriviaList(oldNode.OpenParenToken.GetAllTrivia().Concat(oldNode.Expression.GetLeadingTrivia()));
var trailingTrivia = oldNode.Expression.GetTrailingTrivia().AddRange(oldNode.CloseParenToken.GetAllTrivia());
// Workaround for Roslyn not handling elastic markers for directive trivia correctly.
if (!leadingTrivia.Any())
{
var previousToken = oldNode.OpenParenToken.GetPreviousToken();
if (!previousToken.IsKind(SyntaxKind.OpenParenToken) && (TriviaHelper.IndexOfTrailingWhitespace(previousToken.TrailingTrivia) == -1))
{
leadingTrivia = SyntaxFactory.TriviaList(SyntaxFactory.Space);
}
}
return(oldNode.Expression
.WithLeadingTrivia(leadingTrivia)
.WithTrailingTrivia(trailingTrivia.Any() ? trailingTrivia : SyntaxFactory.TriviaList(SyntaxFactory.ElasticMarker)));
}
private static async Task <Document> RemoveSemicolonTextAsync(Document document, SyntaxToken token, CancellationToken cancellationToken)
{
TextChange textChange;
SourceText sourceText = await document.GetTextAsync(cancellationToken).ConfigureAwait(false);
TextLine line = sourceText.Lines.GetLineFromPosition(token.SpanStart);
if (sourceText.ToString(line.Span).Trim() == token.Text)
{
// remove the line containing the semicolon token
textChange = new TextChange(line.SpanIncludingLineBreak, string.Empty);
return(document.WithText(sourceText.WithChanges(textChange)));
}
TextSpan spanToRemove;
var whitespaceIndex = TriviaHelper.IndexOfTrailingWhitespace(token.LeadingTrivia);
if (whitespaceIndex >= 0)
{
spanToRemove = TextSpan.FromBounds(token.LeadingTrivia[whitespaceIndex].Span.Start, token.Span.End);
}
else
{
var previousToken = token.GetPreviousToken();
whitespaceIndex = TriviaHelper.IndexOfTrailingWhitespace(previousToken.TrailingTrivia);
if (whitespaceIndex >= 0)
{
spanToRemove = TextSpan.FromBounds(previousToken.TrailingTrivia[whitespaceIndex].Span.Start, token.Span.End);
}
else
{
spanToRemove = token.Span;
}
}
textChange = new TextChange(spanToRemove, string.Empty);
return(document.WithText(sourceText.WithChanges(textChange)));
}
private static void HandleSyntaxTree(SyntaxTreeAnalysisContext context, StyleCopSettings settings)
{
var endOfFileToken = context.Tree.GetRoot().GetLastToken(includeZeroWidth: true);
TextSpan reportedSpan = new TextSpan(endOfFileToken.SpanStart, 0);
SyntaxTrivia precedingTrivia = default;
bool checkPrecedingToken;
if (endOfFileToken.HasLeadingTrivia)
{
var leadingTrivia = endOfFileToken.LeadingTrivia;
var trailingWhitespaceIndex = TriviaHelper.IndexOfTrailingWhitespace(leadingTrivia);
if (trailingWhitespaceIndex > 0)
{
checkPrecedingToken = false;
reportedSpan = TextSpan.FromBounds(leadingTrivia[trailingWhitespaceIndex].SpanStart, reportedSpan.End);
precedingTrivia = leadingTrivia[trailingWhitespaceIndex - 1];
}
else if (trailingWhitespaceIndex == 0)
{
checkPrecedingToken = true;
reportedSpan = TextSpan.FromBounds(leadingTrivia[trailingWhitespaceIndex].SpanStart, reportedSpan.End);
}
else
{
checkPrecedingToken = false;
precedingTrivia = leadingTrivia.Last();
}
}
else
{
checkPrecedingToken = true;
}
if (checkPrecedingToken)
{
var previousToken = endOfFileToken.GetPreviousToken(includeZeroWidth: true, includeSkipped: true, includeDirectives: true, includeDocumentationComments: true);
var trailingWhitespaceIndex = TriviaHelper.IndexOfTrailingWhitespace(previousToken.TrailingTrivia);
if (trailingWhitespaceIndex > 0)
{
reportedSpan = TextSpan.FromBounds(previousToken.TrailingTrivia[trailingWhitespaceIndex].SpanStart, reportedSpan.End);
precedingTrivia = previousToken.TrailingTrivia[trailingWhitespaceIndex - 1];
}
else if (trailingWhitespaceIndex == 0)
{
reportedSpan = TextSpan.FromBounds(previousToken.TrailingTrivia[trailingWhitespaceIndex].SpanStart, reportedSpan.End);
precedingTrivia = default;
}
else
{
if (previousToken.TrailingTrivia.Count > 0)
{
precedingTrivia = previousToken.TrailingTrivia.Last();
}
}
}
if (precedingTrivia.IsDirective)
{
if (precedingTrivia.GetStructure() is DirectiveTriviaSyntax directiveTriviaSyntax &&
directiveTriviaSyntax.EndOfDirectiveToken.HasTrailingTrivia)
{
var trailingWhitespaceIndex = TriviaHelper.IndexOfTrailingWhitespace(directiveTriviaSyntax.EndOfDirectiveToken.TrailingTrivia);
if (trailingWhitespaceIndex >= 0)
{
reportedSpan = TextSpan.FromBounds(directiveTriviaSyntax.EndOfDirectiveToken.TrailingTrivia[trailingWhitespaceIndex].SpanStart, reportedSpan.End);
}
}
}
else if (precedingTrivia.IsKind(SyntaxKind.EndOfLineTrivia))
{
reportedSpan = TextSpan.FromBounds(precedingTrivia.SpanStart, reportedSpan.End);
}
SourceText sourceText = context.Tree.GetText(context.CancellationToken);
string trailingWhitespaceText = sourceText.ToString(reportedSpan);
int firstNewline = trailingWhitespaceText.IndexOf('\n');
int secondNewline = firstNewline >= 0 ? trailingWhitespaceText.IndexOf('\n', firstNewline + 1) : -1;
DiagnosticDescriptor descriptorToReport;
switch (settings.LayoutRules.NewlineAtEndOfFile)
{
case OptionSetting.Omit:
if (firstNewline < 0)
{
return;
}
descriptorToReport = DescriptorOmit;
break;
case OptionSetting.Require:
if (firstNewline >= 0 && firstNewline == trailingWhitespaceText.Length - 1)
{
return;
}
descriptorToReport = DescriptorRequire;
break;
case OptionSetting.Allow:
default:
if (secondNewline < 0)
{
// 1. A newline is allowed but not required
// 2. If a newline is included, it cannot be followed by whitespace
if (firstNewline < 0 || firstNewline == trailingWhitespaceText.Length - 1)
{
return;
}
}
descriptorToReport = DescriptorAllow;
break;
}
context.ReportDiagnostic(Diagnostic.Create(descriptorToReport, Location.Create(context.Tree, reportedSpan)));
}