public override SyntaxNode VisitUsingDirective(UsingDirectiveSyntax node)
{
// The strip list is used to remove using directives that will be moved.
if (this.stripList.Contains(node))
{
var nextToken = node.SemicolonToken.GetNextToken();
if (!nextToken.IsKind(SyntaxKind.None))
{
var index = TriviaHelper.IndexOfFirstNonBlankLineTrivia(nextToken.LeadingTrivia);
if (index != 0)
{
this.tokensToStrip.AddLast(nextToken);
}
}
return(null);
}
// The replacement map is used to replace using declarations in place in sorted order (inside directive trivia)
UsingDirectiveSyntax replacementNode;
if (this.replaceMap.TryGetValue(node, out replacementNode))
{
return(replacementNode);
}
return(base.VisitUsingDirective(node));
}
private static void HandleSyntaxTreeAnalysis(SyntaxTreeAnalysisContext context)
{
var firstToken = context.Tree.GetRoot().GetFirstToken(includeZeroWidth: true);
if (firstToken.HasLeadingTrivia)
{
var leadingTrivia = firstToken.LeadingTrivia;
var firstNonBlankLineTriviaIndex = TriviaHelper.IndexOfFirstNonBlankLineTrivia(leadingTrivia);
switch (firstNonBlankLineTriviaIndex)
{
case 0:
// no blank lines
break;
case -1:
// only blank lines
context.ReportDiagnostic(Diagnostic.Create(Descriptor, Location.Create(context.Tree, leadingTrivia.Span)));
break;
default:
var textSpan = TextSpan.FromBounds(leadingTrivia[0].Span.Start, leadingTrivia[firstNonBlankLineTriviaIndex].Span.Start);
context.ReportDiagnostic(Diagnostic.Create(Descriptor, Location.Create(context.Tree, textSpan)));
break;
}
}
}
private static void HandleSyntaxTree(SyntaxTreeAnalysisContext context)
{
if (context.Tree.IsWhitespaceOnly(context.CancellationToken))
{
// Handling of empty documents is now the responsibility of the analyzers
return;
}
var firstToken = context.Tree.GetRoot().GetFirstToken(includeZeroWidth: true);
if (firstToken.HasLeadingTrivia)
{
var leadingTrivia = firstToken.LeadingTrivia;
var firstNonBlankLineTriviaIndex = TriviaHelper.IndexOfFirstNonBlankLineTrivia(leadingTrivia);
switch (firstNonBlankLineTriviaIndex)
{
case 0:
// no blank lines
break;
case -1:
// only blank lines
context.ReportDiagnostic(Diagnostic.Create(Descriptor, Location.Create(context.Tree, leadingTrivia.Span)));
break;
default:
var textSpan = TextSpan.FromBounds(leadingTrivia[0].Span.Start, leadingTrivia[firstNonBlankLineTriviaIndex].Span.Start);
context.ReportDiagnostic(Diagnostic.Create(Descriptor, Location.Create(context.Tree, textSpan)));
break;
}
}
}
/// <inheritdoc/>
public override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
foreach (Diagnostic diagnostic in context.Diagnostics.Where(d => FixableDiagnostics.Contains(d.Id)))
{
var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
var firstToken = syntaxRoot.GetFirstToken(includeZeroWidth: true);
var leadingTrivia = firstToken.LeadingTrivia;
var newTriviaList = SyntaxFactory.TriviaList();
var firstNonBlankLineTriviaIndex = TriviaHelper.IndexOfFirstNonBlankLineTrivia(leadingTrivia);
if (firstNonBlankLineTriviaIndex != -1)
{
for (var index = firstNonBlankLineTriviaIndex; index < leadingTrivia.Count; index++)
{
newTriviaList = newTriviaList.Add(leadingTrivia[index]);
}
}
var newFirstToken = firstToken.WithLeadingTrivia(newTriviaList);
var newSyntaxRoot = syntaxRoot.ReplaceToken(firstToken, newFirstToken);
var newDocument = context.Document.WithSyntaxRoot(newSyntaxRoot);
context.RegisterCodeFix(CodeAction.Create("Remove blank lines at the start of the file", token => Task.FromResult(newDocument)), diagnostic);
}
}
public override SyntaxToken VisitToken(SyntaxToken token)
{
if (this.tokensToStrip.Contains(token))
{
this.tokensToStrip.Remove(token);
var index = TriviaHelper.IndexOfFirstNonBlankLineTrivia(token.LeadingTrivia);
var newLeadingTrivia = (index == -1) ? SyntaxFactory.TriviaList() : SyntaxFactory.TriviaList(token.LeadingTrivia.Skip(index));
return(token.WithLeadingTrivia(newLeadingTrivia));
}
return(base.VisitToken(token));
}
private static async Task <SyntaxNode> GetTransformedSyntaxRootAsync(Document document, CancellationToken token)
{
var syntaxRoot = await document.GetSyntaxRootAsync(token).ConfigureAwait(false);
var firstToken = syntaxRoot.GetFirstToken(includeZeroWidth: true);
var leadingTrivia = firstToken.LeadingTrivia;
var newTriviaList = SyntaxFactory.TriviaList();
var firstNonBlankLineTriviaIndex = TriviaHelper.IndexOfFirstNonBlankLineTrivia(leadingTrivia);
if (firstNonBlankLineTriviaIndex != -1)
{
for (var index = firstNonBlankLineTriviaIndex; index < leadingTrivia.Count; index++)
{
newTriviaList = newTriviaList.Add(leadingTrivia[index]);
}
}
var newFirstToken = firstToken.WithLeadingTrivia(newTriviaList);
var newSyntaxRoot = syntaxRoot.ReplaceToken(firstToken, newFirstToken);
return(newSyntaxRoot);
}
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);
}