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 async Task <SyntaxNode> GetTransformedSyntaxRootAsync(Document document, CancellationToken cancellationToken)
{
var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
var settings = document.Project.AnalyzerOptions.GetStyleCopSettings(root.SyntaxTree, cancellationToken);
var fileHeader = FileHeaderHelpers.ParseFileHeader(root);
SyntaxNode newSyntaxRoot;
if (fileHeader.IsMissing)
{
newSyntaxRoot = AddHeader(document, root, GetFileName(document), settings);
}
else
{
var trivia = root.GetLeadingTrivia();
var commentIndex = TriviaHelper.IndexOfFirstNonWhitespaceTrivia(trivia, false);
// Safe to do this as fileHeader.IsMissing is false.
var isMultiLineComment = trivia[commentIndex].IsKind(SyntaxKind.MultiLineCommentTrivia);
var xmlFileHeader = FileHeaderHelpers.ParseXmlFileHeader(root);
if (isMultiLineComment && !xmlFileHeader.IsMalformed)
{
newSyntaxRoot = ReplaceWellFormedMultiLineCommentHeader(document, root, settings, commentIndex, xmlFileHeader);
}
else
{
newSyntaxRoot = ReplaceHeader(document, root, settings, xmlFileHeader.IsMalformed);
}
}
return(newSyntaxRoot);
}
/// <summary>
/// Checks if a given <see cref="SyntaxTree"/> only contains whitespaces. We don't want to analyze empty files.
/// </summary>
/// <param name="tree">The syntax tree to examine.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> that the task will observe.</param>
/// <returns>
/// <para><see langword="true"/> if <paramref name="tree"/> only contains whitespaces; otherwise, <see langword="false"/>.</para>
/// </returns>
private static bool IsEmpty(SyntaxTree tree, CancellationToken cancellationToken)
{
var root = tree.GetRoot(cancellationToken);
var firstToken = root.GetFirstToken(includeZeroWidth: true);
return(firstToken.IsKind(SyntaxKind.EndOfFileToken) &&
TriviaHelper.IndexOfFirstNonWhitespaceTrivia(firstToken.LeadingTrivia, true) == -1);
}
private static List <BaseFieldDeclarationSyntax> DeclarationSplitter(
Document document,
VariableDeclarationSyntax declaration,
Func <VariableDeclarationSyntax, BaseFieldDeclarationSyntax> declarationFactory,
SyntaxTriviaList declarationTrailingTrivia)
{
SeparatedSyntaxList <VariableDeclaratorSyntax> variables = declaration.Variables;
VariableDeclaratorSyntax first = variables.First();
BaseFieldDeclarationSyntax previous = null;
var newFieldDeclarations = new List <BaseFieldDeclarationSyntax>(variables.Count);
foreach (SyntaxNodeOrToken nodeOrToken in variables.GetWithSeparators())
{
if (previous == null)
{
VariableDeclaratorSyntax variable = (VariableDeclaratorSyntax)nodeOrToken.AsNode();
variable = variable.WithIdentifier(variable.Identifier.WithoutLeadingWhitespace());
var variableDeclarator = SyntaxFactory.SingletonSeparatedList(variable);
previous = declarationFactory(declaration.WithVariables(variableDeclarator));
if (variable != first)
{
var triviaList = previous.GetLeadingTrivia().WithoutDirectiveTrivia();
// Remove all leading blank lines
var nonBlankLinetriviaIndex = TriviaHelper.IndexOfFirstNonBlankLineTrivia(triviaList);
if (nonBlankLinetriviaIndex > 0)
{
triviaList = triviaList.RemoveRange(0, nonBlankLinetriviaIndex);
}
// Add a blank line if the first line contains a comment.
var nonWhitespaceTriviaIndex = TriviaHelper.IndexOfFirstNonWhitespaceTrivia(triviaList, false);
if (nonWhitespaceTriviaIndex >= 0)
{
switch (triviaList[nonWhitespaceTriviaIndex].Kind())
{
case SyntaxKind.SingleLineCommentTrivia:
case SyntaxKind.MultiLineCommentTrivia:
triviaList = triviaList.Insert(0, SyntaxFactory.CarriageReturnLineFeed);
break;
}
}
previous = previous.WithLeadingTrivia(triviaList);
}
}
else
{
SyntaxToken commaToken = nodeOrToken.AsToken();
SyntaxTriviaList trailingTrivia = commaToken.TrailingTrivia;
if (trailingTrivia.Any())
{
if (!trailingTrivia.Last().IsKind(SyntaxKind.EndOfLineTrivia))
{
trailingTrivia = trailingTrivia.WithoutTrailingWhitespace().Add(FormattingHelper.GetNewLineTrivia(document));
}
}
else
{
trailingTrivia = SyntaxTriviaList.Create(FormattingHelper.GetNewLineTrivia(document));
}
newFieldDeclarations.Add(previous.WithTrailingTrivia(trailingTrivia));
previous = null;
}
}
newFieldDeclarations.Add(previous.WithTrailingTrivia(declarationTrailingTrivia));
return(newFieldDeclarations);
}