public static void Analyze(SyntaxNodeAnalysisContext context, RegionDirectiveTriviaSyntax region)
{
if (region.IsKind(SyntaxKind.RegionDirectiveTrivia))
{
List <DirectiveTriviaSyntax> relatedDirectives = region.GetRelatedDirectives();
if (relatedDirectives.Count == 2 &&
relatedDirectives[1].IsKind(SyntaxKind.EndRegionDirectiveTrivia))
{
DirectiveTriviaSyntax endRegion = relatedDirectives[1];
if (endRegion.IsKind(SyntaxKind.EndRegionDirectiveTrivia))
{
SyntaxTrivia trivia = region.ParentTrivia;
SyntaxTriviaList list = trivia.GetContainingList();
if (list.Any())
{
EndRegionDirectiveTriviaSyntax endRegion2 = FindEndRegion(list, list.IndexOf(trivia));
if (endRegion == endRegion2)
{
context.ReportDiagnostic(
DiagnosticDescriptors.RemoveEmptyRegion,
region.GetLocation(),
endRegion.GetLocation());
}
}
}
}
}
}
/// <summary>
/// Checks if a region is completely part of a body. That means that the <c>#region</c> and <c>#endregion</c>
/// tags both have to have a common <see cref="BlockSyntax"/> as one of their ancestors.
/// </summary>
/// <param name="regionSyntax">The <see cref="RegionDirectiveTriviaSyntax"/> that should be analyzed.</param>
/// <returns><see langword="true"/>, if both tags have a common <see cref="BlockSyntax"/> as one of their
/// ancestors; otherwise, <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException">
/// If <paramref name="regionSyntax"/> is <see langword="null"/>.
/// </exception>
internal static bool IsCompletelyContainedInBody(RegionDirectiveTriviaSyntax regionSyntax)
{
if (regionSyntax == null)
{
throw new ArgumentNullException(nameof(regionSyntax));
}
BlockSyntax syntax = null;
foreach (var directive in regionSyntax.GetRelatedDirectives())
{
BlockSyntax blockSyntax = directive.AncestorsAndSelf().OfType <BlockSyntax>().LastOrDefault();
if (blockSyntax == null)
{
return(false);
}
else if (syntax == null)
{
syntax = blockSyntax;
}
else if (blockSyntax != syntax)
{
return(false);
}
}
return(true);
}
public static async Task <Document> RemoveRegionAsync(
this Document document,
RegionDirectiveTriviaSyntax regionDirective,
CancellationToken cancellationToken = default(CancellationToken))
{
if (document == null)
{
throw new ArgumentNullException(nameof(document));
}
if (regionDirective == null)
{
throw new ArgumentNullException(nameof(regionDirective));
}
List <DirectiveTriviaSyntax> list = regionDirective.GetRelatedDirectives();
if (list.Count == 2 &&
list[1].IsKind(SyntaxKind.EndRegionDirectiveTrivia))
{
var endRegionDirective = (EndRegionDirectiveTriviaSyntax)list[1];
return(await RemoveRegionAsync(document, regionDirective, endRegionDirective, cancellationToken).ConfigureAwait(false));
}
return(document);
}
/// <summary>
/// Checks if a region is completely part of a body. That means that the <c>#region</c> and <c>#endregion</c>
/// tags both have to have a common <see cref="BlockSyntax"/> as one of their ancestors.
/// </summary>
/// <param name="regionSyntax">The <see cref="RegionDirectiveTriviaSyntax"/> that should be analyzed.</param>
/// <returns><see langword="true"/>, if both tags have a common <see cref="BlockSyntax"/> as one of their
/// ancestors; otherwise, <see langword="false"/>.</returns>
/// <exception cref="ArgumentNullException">
/// If <paramref name="regionSyntax"/> is <see langword="null"/>.
/// </exception>
internal static bool IsCompletelyContainedInBody(RegionDirectiveTriviaSyntax regionSyntax)
{
if (regionSyntax == null)
{
throw new ArgumentNullException(nameof(regionSyntax));
}
BlockSyntax syntax = null;
foreach (var directive in regionSyntax.GetRelatedDirectives())
{
BlockSyntax blockSyntax = directive.AncestorsAndSelf().OfType<BlockSyntax>().LastOrDefault();
if (blockSyntax == null)
{
return false;
}
else if (syntax == null)
{
syntax = blockSyntax;
}
else if (blockSyntax != syntax)
{
return false;
}
}
return true;
}
public static async Task <Document> RemoveRegionAsync(
Document document,
RegionDirectiveTriviaSyntax regionDirective,
CancellationToken cancellationToken = default(CancellationToken))
{
if (document == null)
{
throw new ArgumentNullException(nameof(document));
}
if (regionDirective == null)
{
throw new ArgumentNullException(nameof(regionDirective));
}
List <DirectiveTriviaSyntax> list = regionDirective.GetRelatedDirectives();
if (list.Count == 2 &&
list[1].IsKind(SyntaxKind.EndRegionDirectiveTrivia))
{
var endRegionDirective = (EndRegionDirectiveTriviaSyntax)list[1];
SourceText sourceText = await document.GetTextAsync(cancellationToken).ConfigureAwait(false);
int startLine = regionDirective.GetSpanStartLine();
int endLine = endRegionDirective.GetSpanEndLine();
TextLineCollection lines = sourceText.Lines;
TextSpan span = TextSpan.FromBounds(
lines[startLine].Start,
lines[endLine].EndIncludingLineBreak);
var textChange = new TextChange(span, string.Empty);
SourceText newSourceText = sourceText.WithChanges(textChange);
return(document.WithText(newSourceText));
}
return(document);
}
internal static RegionInfo Create(RegionDirectiveTriviaSyntax regionDirective)
{
if (regionDirective == null)
{
return(Default);
}
List <DirectiveTriviaSyntax> list = regionDirective.GetRelatedDirectives();
if (list.Count != 2)
{
return(Default);
}
if (list[1].Kind() != SyntaxKind.EndRegionDirectiveTrivia)
{
return(Default);
}
return(new RegionInfo(regionDirective, (EndRegionDirectiveTriviaSyntax)list[1]));
}
private static EndRegionDirectiveTriviaSyntax GetEndRegion(RegionDirectiveTriviaSyntax region)
{
return(region.GetRelatedDirectives().Skip(1).FirstOrDefault() as EndRegionDirectiveTriviaSyntax);
}