private static void AnalyzeTypeDeclaration(SyntaxNodeAnalysisContext context, TypeDeclarationSyntax typeDeclaration, INamedTypeSymbol debuggerDisplayAttribute)
{
if (typeDeclaration.Modifiers.Contains(SyntaxKind.PartialKeyword))
{
return;
}
SyntaxList <MemberDeclarationSyntax> members = typeDeclaration.Members;
UnusedMemberWalker walker = null;
foreach (MemberDeclarationSyntax member in members)
{
if (member.ContainsDiagnostics)
{
continue;
}
if (member.ContainsDirectives)
{
continue;
}
switch (member.Kind())
{
case SyntaxKind.DelegateDeclaration:
{
var declaration = (DelegateDeclarationSyntax)member;
if (SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddDelegate(declaration.Identifier.ValueText, declaration);
}
break;
}
case SyntaxKind.EventDeclaration:
{
var declaration = (EventDeclarationSyntax)member;
if (declaration.ExplicitInterfaceSpecifier == null &&
SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNode(declaration.Identifier.ValueText, declaration);
}
break;
}
case SyntaxKind.EventFieldDeclaration:
{
var declaration = (EventFieldDeclarationSyntax)member;
if (SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNodes(declaration.Declaration);
}
break;
}
case SyntaxKind.FieldDeclaration:
{
var declaration = (FieldDeclarationSyntax)member;
SyntaxTokenList modifiers = declaration.Modifiers;
if (SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNodes(declaration.Declaration, isConst: modifiers.Contains(SyntaxKind.ConstKeyword));
}
break;
}
case SyntaxKind.MethodDeclaration:
{
var declaration = (MethodDeclarationSyntax)member;
SyntaxTokenList modifiers = declaration.Modifiers;
if (declaration.ExplicitInterfaceSpecifier == null &&
!declaration.AttributeLists.Any() &&
SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
string methodName = declaration.Identifier.ValueText;
if (!IsMainMethod(declaration, modifiers, methodName))
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNode(methodName, declaration);
}
}
break;
}
case SyntaxKind.PropertyDeclaration:
{
var declaration = (PropertyDeclarationSyntax)member;
if (declaration.ExplicitInterfaceSpecifier == null &&
SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNode(declaration.Identifier.ValueText, declaration);
}
break;
}
}
}
if (walker == null)
{
return;
}
if (debuggerDisplayAttribute != null &&
walker.Nodes.Any(f => f.CanBeInDebuggerDisplayAttribute) &&
ShouldAnalyzeDebuggerDisplayAttribute())
{
string value = context.SemanticModel
.GetDeclaredSymbol(typeDeclaration, context.CancellationToken)
.GetAttribute(debuggerDisplayAttribute)?
.ConstructorArguments
.SingleOrDefault(shouldThrow: false)
.Value?
.ToString();
if (value != null)
{
RemoveMethodsAndPropertiesThatAreInDebuggerDisplayAttributeValue(walker.Nodes, value);
}
if (walker.Nodes.Count == 0)
{
return;
}
}
walker.Visit(typeDeclaration);
foreach (NodeSymbolInfo info in UnusedMemberWalkerCache.GetNodesAndFree(walker))
{
SyntaxNode node = info.Node;
if (node is VariableDeclaratorSyntax variableDeclarator)
{
var variableDeclaration = (VariableDeclarationSyntax)variableDeclarator.Parent;
if (variableDeclaration.Variables.Count == 1)
{
ReportDiagnostic(context, variableDeclaration.Parent, CSharpFacts.GetTitle(variableDeclaration.Parent));
}
else
{
ReportDiagnostic(context, variableDeclarator, CSharpFacts.GetTitle(variableDeclaration.Parent));
}
}
else
{
ReportDiagnostic(context, node, CSharpFacts.GetTitle(node));
}
}
bool ShouldAnalyzeDebuggerDisplayAttribute()
{
if (typeDeclaration.Modifiers.Contains(SyntaxKind.PartialKeyword))
{
return(true);
}
foreach (AttributeListSyntax attributeList in typeDeclaration.AttributeLists)
{
foreach (AttributeSyntax attribute in attributeList.Attributes)
{
if (attribute.ArgumentList?.Arguments.Count(f => f.NameEquals == null) == 1)
{
return(true);
}
}
}
return(false);
}
}
private static void AnalyzeTypeDeclaration(SyntaxNodeAnalysisContext context, TypeDeclarationSyntax typeDeclaration)
{
if (typeDeclaration.Modifiers.Contains(SyntaxKind.PartialKeyword))
{
return;
}
SyntaxList <MemberDeclarationSyntax> members = typeDeclaration.Members;
UnusedMemberWalker walker = null;
foreach (MemberDeclarationSyntax member in members)
{
if (member.ContainsDiagnostics)
{
continue;
}
if (member.ContainsDirectives)
{
continue;
}
switch (member.Kind())
{
case SyntaxKind.DelegateDeclaration:
{
var declaration = (DelegateDeclarationSyntax)member;
if (SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNode(declaration.Identifier.ValueText, declaration);
}
break;
}
case SyntaxKind.EventDeclaration:
{
var declaration = (EventDeclarationSyntax)member;
if (declaration.ExplicitInterfaceSpecifier == null &&
SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNode(declaration.Identifier.ValueText, declaration);
}
break;
}
case SyntaxKind.EventFieldDeclaration:
{
var declaration = (EventFieldDeclarationSyntax)member;
if (SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNodes(declaration.Declaration);
}
break;
}
case SyntaxKind.FieldDeclaration:
{
var declaration = (FieldDeclarationSyntax)member;
SyntaxTokenList modifiers = declaration.Modifiers;
if (SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNodes(declaration.Declaration, isConst: modifiers.Contains(SyntaxKind.ConstKeyword));
}
break;
}
case SyntaxKind.MethodDeclaration:
{
var declaration = (MethodDeclarationSyntax)member;
SyntaxTokenList modifiers = declaration.Modifiers;
if (declaration.ExplicitInterfaceSpecifier == null &&
!declaration.AttributeLists.Any() &&
SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
string methodName = declaration.Identifier.ValueText;
if (!IsMainMethod(declaration, modifiers, methodName))
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNode(methodName, declaration);
}
}
break;
}
case SyntaxKind.PropertyDeclaration:
{
var declaration = (PropertyDeclarationSyntax)member;
if (declaration.ExplicitInterfaceSpecifier == null &&
SyntaxAccessibility.GetAccessibility(declaration) == Accessibility.Private)
{
if (walker == null)
{
walker = UnusedMemberWalkerCache.GetInstance(context.SemanticModel, context.CancellationToken);
}
walker.AddNode(declaration.Identifier.ValueText, declaration);
}
break;
}
}
}
if (walker == null)
{
return;
}
walker.Visit(typeDeclaration);
foreach (NodeSymbolInfo info in UnusedMemberWalkerCache.GetNodesAndFree(walker))
{
SyntaxNode node = info.Node;
if (node is VariableDeclaratorSyntax variableDeclarator)
{
var variableDeclaration = (VariableDeclarationSyntax)variableDeclarator.Parent;
if (variableDeclaration.Variables.Count == 1)
{
ReportDiagnostic(context, variableDeclaration.Parent, CSharpFacts.GetTitle(variableDeclaration.Parent));
}
else
{
ReportDiagnostic(context, variableDeclarator, CSharpFacts.GetTitle(variableDeclaration.Parent));
}
}
else
{
ReportDiagnostic(context, node, CSharpFacts.GetTitle(node));
}
}
}
public static void AnalyzeClassDeclaration(SyntaxNodeAnalysisContext context)
{
var classDeclaration = (ClassDeclarationSyntax)context.Node;
if (!classDeclaration.Identifier.ValueText.EndsWith("Extensions", StringComparison.Ordinal))
{
return;
}
if (!classDeclaration.Modifiers.Contains(SyntaxKind.StaticKeyword))
{
return;
}
if (!classDeclaration.IsParentKind(SyntaxKind.NamespaceDeclaration, SyntaxKind.CompilationUnit))
{
return;
}
if (!SyntaxAccessibility.GetAccessibility(classDeclaration).Is(Accessibility.Public, Accessibility.Internal))
{
return;
}
foreach (MemberDeclarationSyntax member in classDeclaration.Members)
{
if (!member.IsKind(SyntaxKind.MethodDeclaration))
{
continue;
}
var methodDeclaration = (MethodDeclarationSyntax)member;
if (!methodDeclaration.Modifiers.Contains(SyntaxKind.StaticKeyword))
{
continue;
}
if (!SyntaxAccessibility.GetAccessibility(methodDeclaration).Is(Accessibility.Public, Accessibility.Internal))
{
continue;
}
ParameterSyntax parameter = methodDeclaration.ParameterList?.Parameters.FirstOrDefault();
if (parameter == null)
{
continue;
}
bool isThis = false;
bool isIn = false;
bool isRef = false;
foreach (SyntaxToken modifier in parameter.Modifiers)
{
SyntaxKind kind = modifier.Kind();
if (kind == SyntaxKind.ThisKeyword)
{
isThis = true;
break;
}
else if (kind == SyntaxKind.InKeyword)
{
isIn = true;
}
else if (kind == SyntaxKind.RefKeyword)
{
isRef = true;
}
if (isThis)
{
break;
}
}
if (isThis)
{
continue;
}
if (isIn)
{
IParameterSymbol parameterSymbol = context.SemanticModel.GetDeclaredSymbol(parameter, context.CancellationToken);
ITypeSymbol typeSymbol = parameterSymbol.Type;
if (!typeSymbol.IsValueType)
{
continue;
}
if (typeSymbol.Kind == SymbolKind.TypeParameter)
{
continue;
}
}
else if (isRef)
{
IParameterSymbol parameterSymbol = context.SemanticModel.GetDeclaredSymbol(parameter, context.CancellationToken);
if (!parameterSymbol.Type.IsValueType)
{
continue;
}
}
context.ReportDiagnostic(DiagnosticDescriptors.MakeMethodExtensionMethod, methodDeclaration.Identifier);
}
}