restore changes lost in merge

Author: JakubLinhart

StyleCop.Analyzers/StyleCop.Analyzers/LayoutRules/SA1516ElementsMustBeSeparatedByBlankLine.cs

@@ -15,6 +15,7 @@ namespace StyleCop.Analyzers.LayoutRules
     using Microsoft.CodeAnalysis.Diagnostics;
     using Microsoft.CodeAnalysis.Text;
     using StyleCop.Analyzers.Helpers;
+    using StyleCop.Analyzers.Lightup;
     using StyleCop.Analyzers.Settings.ObjectModel;
 
     /// <summary>
@@ -87,6 +88,7 @@ internal class SA1516ElementsMustBeSeparatedByBlankLine : DiagnosticAnalyzer
         private static readonly Action<SyntaxNodeAnalysisContext> TypeDeclarationAction = HandleTypeDeclaration;
         private static readonly Action<SyntaxNodeAnalysisContext, StyleCopSettings> CompilationUnitAction = HandleCompilationUnit;
         private static readonly Action<SyntaxNodeAnalysisContext, StyleCopSettings> NamespaceDeclarationAction = HandleNamespaceDeclaration;
+        private static readonly Action<SyntaxNodeAnalysisContext, StyleCopSettings> FileScopedNamespaceDeclarationAction = HandleFileScopedNamespaceDeclaration;
         private static readonly Action<SyntaxNodeAnalysisContext> BasePropertyDeclarationAction = HandleBasePropertyDeclaration;
 
         private static readonly ImmutableDictionary<string, string> DiagnosticProperties = ImmutableDictionary<string, string>.Empty.Add(CodeFixActionKey, InsertBlankLineValue);
@@ -129,6 +131,7 @@ public override void Initialize(AnalysisContext context)
                 context.RegisterSyntaxNodeAction(TypeDeclarationAction, SyntaxKinds.TypeDeclaration);
                 context.RegisterSyntaxNodeAction(CompilationUnitAction, SyntaxKind.CompilationUnit);
                 context.RegisterSyntaxNodeAction(NamespaceDeclarationAction, SyntaxKind.NamespaceDeclaration);
+                context.RegisterSyntaxNodeAction(FileScopedNamespaceDeclarationAction, SyntaxKindEx.FileScopedNamespaceDeclaration);
                 context.RegisterSyntaxNodeAction(BasePropertyDeclarationAction, SyntaxKinds.BasePropertyDeclaration);
             });
         }
@@ -212,6 +215,20 @@ private static void HandleCompilationUnit(SyntaxNodeAnalysisContext context, Sty
             }
         }
 
+        private static void HandleFileScopedNamespaceDeclaration(SyntaxNodeAnalysisContext context, StyleCopSettings settings)
+        {
+            var namespaceDeclaration = (BaseNamespaceDeclarationSyntaxWrapper)context.Node;
+
+            var members = namespaceDeclaration.Members;
+
+            HandleMemberList(context, members);
+
+            if (members.Count > 0)
+            {
+                ReportIfThereIsNoBlankLine(context, namespaceDeclaration.Name, members[0]);
+            }
+        }
+
         private static void HandleNamespaceDeclaration(SyntaxNodeAnalysisContext context, StyleCopSettings settings)
         {
             var namespaceDeclaration = (NamespaceDeclarationSyntax)context.Node;