Fix RCS1216 (dotnet#1094)

Co-authored-by: Josef Pihrt <josef.pihrt@outlook.com>

Author: 2 people

ChangeLog.md

@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Recognize more shapes of IAsyncEnumerable as being Async ([RCS1047](https://github.com/JosefPihrt/Roslynator/blob/main/docs/analyzers/RCS1047.md)) ([#1084](https://github.com/josefpihrt/roslynator/pull/1084)).
 - Fix [RCS1197](https://github.com/JosefPihrt/Roslynator/blob/main/docs/analyzers/RCS1197.md) ([#1093](https://github.com/JosefPihrt/Roslynator/pull/1093)).
 - Fix [RCS1056](https://github.com/JosefPihrt/Roslynator/blob/main/docs/analyzers/RCS1056.md) ([#1096](https://github.com/JosefPihrt/Roslynator/pull/1096)).
+- Fix [RCS1216](https://github.com/JosefPihrt/Roslynator/blob/main/docs/analyzers/RCS1216.md) ([#1094](https://github.com/JosefPihrt/Roslynator/pull/1094)).
 
 ## [4.3.0] - 2023-04-24
 

src/Analyzers/CSharp/Analysis/UnnecessaryUnsafeContextAnalyzer.cs

@@ -58,7 +58,7 @@ private static void AnalyzeUnsafeStatement(SyntaxNodeAnalysisContext context)
         if (!unsafeStatement.Block.Statements.Any())
             return;
 
-        if (!ParentDeclarationsContainsUnsafeModifier(unsafeStatement))
+        if (!AncestorContainsUnsafeModifier(unsafeStatement.Parent))
             return;
 
         DiagnosticHelpers.ReportDiagnostic(context, DiagnosticRules.UnnecessaryUnsafeContext, unsafeStatement.UnsafeKeyword);
@@ -68,26 +68,7 @@ private static void AnalyzeLocalFunctionStatement(SyntaxNodeAnalysisContext cont
     {
         var localFunctionStatement = (LocalFunctionStatementSyntax)context.Node;
 
-        SyntaxTokenList modifiers = localFunctionStatement.Modifiers;
-
-        int index = modifiers.IndexOf(SyntaxKind.UnsafeKeyword);
-
-        if (index == -1)
-            return;
-
-        SyntaxNode parent = localFunctionStatement.Parent;
-
-        SyntaxDebug.Assert(parent.IsKind(SyntaxKind.Block), parent);
-
-        if (parent is not BlockSyntax)
-            return;
-
-        parent = parent.Parent;
-
-        if (!ParentDeclarationsContainsUnsafeModifier(parent))
-            return;
-
-        DiagnosticHelpers.ReportDiagnostic(context, DiagnosticRules.UnnecessaryUnsafeContext, modifiers[index]);
+        AnalyzeMemberDeclaration(context, localFunctionStatement, localFunctionStatement.Modifiers);
     }
 
     private static void AnalyzeTypeDeclaration(SyntaxNodeAnalysisContext context)
@@ -176,102 +157,45 @@ private static void AnalyzeIndexerDeclaration(SyntaxNodeAnalysisContext context)
 
     private static void AnalyzeMemberDeclaration(
         SyntaxNodeAnalysisContext context,
-        MemberDeclarationSyntax memberDeclaration,
+        SyntaxNode node,
         SyntaxTokenList modifiers)
     {
         int index = modifiers.IndexOf(SyntaxKind.UnsafeKeyword);
 
         if (index == -1)
             return;
 
-        if (!ParentTypeDeclarationsContainsUnsafeModifier(memberDeclaration))
+        if (!AncestorContainsUnsafeModifier(node.Parent))
             return;
 
         DiagnosticHelpers.ReportDiagnostic(context, DiagnosticRules.UnnecessaryUnsafeContext, modifiers[index]);
     }
 
-    private static bool ParentDeclarationsContainsUnsafeModifier(UnsafeStatementSyntax unsafeStatement)
+    private static bool AncestorContainsUnsafeModifier(SyntaxNode node)
     {
-        SyntaxNode parent = unsafeStatement.Parent;
-
-        while (parent is not null)
+        while (node is not null)
         {
-            SyntaxKind kind = parent.Kind();
-
-            if (kind == SyntaxKind.UnsafeStatement)
-            {
-                return true;
-            }
-            else if (kind == SyntaxKind.LocalFunctionStatement)
+            switch (node)
             {
-                break;
+                case UnsafeStatementSyntax:
+                    return true;
+                case MemberDeclarationSyntax memberDeclarationSyntax:
+                    {
+                        if (memberDeclarationSyntax.Modifiers.Contains(SyntaxKind.UnsafeKeyword))
+                            return true;
+
+                        break;
+                    }
+                case LocalFunctionStatementSyntax localFunctionStatement:
+                    {
+                        if (localFunctionStatement.Modifiers.Contains(SyntaxKind.UnsafeKeyword))
+                            return true;
+
+                        break;
+                    }
             }
 
-            if (parent is AccessorDeclarationSyntax)
-            {
-                parent = parent.Parent;
-
-                if (parent is AccessorListSyntax)
-                    parent = parent.Parent;
-
-                break;
-            }
-
-            if (parent is MemberDeclarationSyntax)
-                break;
-
-            parent = parent.Parent;
-        }
-
-        return ParentDeclarationsContainsUnsafeModifier(parent);
-    }
-
-    private static bool ParentDeclarationsContainsUnsafeModifier(SyntaxNode node)
-    {
-        while (node.IsKind(SyntaxKind.LocalFunctionStatement))
-        {
-            var localFunction = (LocalFunctionStatementSyntax)node;
-
-            if (localFunction.Modifiers.Contains(SyntaxKind.UnsafeKeyword))
-                return true;
-
             node = node.Parent;
-
-            SyntaxDebug.Assert(node.IsKind(SyntaxKind.Block), node);
-
-            if (!node.IsKind(SyntaxKind.Block))
-                break;
-
-            node = node.Parent;
-        }
-
-        SyntaxDebug.Assert(node is MemberDeclarationSyntax, node);
-
-        if (node is MemberDeclarationSyntax memberDeclaration)
-        {
-            if (SyntaxInfo.ModifierListInfo(memberDeclaration).IsUnsafe)
-                return true;
-
-            return ParentTypeDeclarationsContainsUnsafeModifier(memberDeclaration);
-        }
-
-        return false;
-    }
-
-    private static bool ParentTypeDeclarationsContainsUnsafeModifier(MemberDeclarationSyntax memberDeclaration)
-    {
-        SyntaxNode parent = memberDeclaration.Parent;
-
-        while (parent.IsKind(
-            SyntaxKind.ClassDeclaration,
-            SyntaxKind.StructDeclaration,
-            SyntaxKind.RecordStructDeclaration,
-            SyntaxKind.InterfaceDeclaration))
-        {
-            if (((TypeDeclarationSyntax)parent).Modifiers.Contains(SyntaxKind.UnsafeKeyword))
-                return true;
-
-            parent = parent.Parent;
         }
 
         return false;