public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier) &&
!Settings.IsCodeFixEnabled(CodeFixIdentifiers.ChangeAccessibility) &&
!Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddStaticModifier) &&
!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveThisModifier) &&
!Settings.IsCodeFixEnabled(CodeFixIdentifiers.MakeContainingClassNonStatic) &&
!Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddPartialModifier) &&
!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveOutModifier) &&
!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveRefModifier) &&
!Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddModifierAbstract))
{
return;
}
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
if (!TryFindToken(root, context.Span.Start, out SyntaxToken token))
{
return;
}
SyntaxNode node = token.Parent;
if (!node.Kind().SupportsModifiers())
{
node = node.FirstAncestor(f => f.Kind().SupportsModifiers());
}
Debug.Assert(node != null, $"{nameof(node)} is null");
if (node == null)
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case CompilerDiagnosticIdentifiers.ModifierIsNotValidForThisItem:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
break;
}
SyntaxTokenList modifiers = node.GetModifiers();
if (modifiers.Contains(token))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, token);
break;
}
else if (IsInterfaceMemberOrExplicitInterfaceImplementation(node))
{
ModifiersCodeFixRegistrator.RemoveModifiers(context, diagnostic, node, modifiers, f =>
{
switch (f.Kind())
{
case SyntaxKind.PublicKeyword:
case SyntaxKind.ProtectedKeyword:
case SyntaxKind.InternalKeyword:
case SyntaxKind.PrivateKeyword:
case SyntaxKind.StaticKeyword:
case SyntaxKind.VirtualKeyword:
case SyntaxKind.OverrideKeyword:
case SyntaxKind.AbstractKeyword:
{
return(true);
}
}
return(false);
});
}
else if (node.IsKind(SyntaxKind.IndexerDeclaration))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.StaticKeyword);
}
else if (node.IsKind(SyntaxKind.PropertyDeclaration))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.AsyncKeyword);
}
break;
}
case CompilerDiagnosticIdentifiers.MoreThanOneProtectionModifier:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, token);
}
break;
}
case CompilerDiagnosticIdentifiers.AccessibilityModifiersMayNotBeUsedOnAccessorsInInterface:
case CompilerDiagnosticIdentifiers.AccessModifiersAreNotAllowedOnStaticConstructors:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
ModifiersCodeFixRegistrator.RemoveAccessModifiers(context, diagnostic, node);
}
break;
}
case CompilerDiagnosticIdentifiers.ModifiersCannotBePlacedOnEventAccessorDeclarations:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
ModifiersCodeFixRegistrator.RemoveModifiers(context, diagnostic, node);
}
break;
}
case CompilerDiagnosticIdentifiers.OnlyMethodsClassesStructsOrInterfacesMayBePartial:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.PartialKeyword);
}
break;
}
case CompilerDiagnosticIdentifiers.ClassCannotBeBothStaticAndSealed:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
break;
}
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.StaticKeyword, additionalKey: nameof(SyntaxKind.StaticKeyword));
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.SealedKeyword, additionalKey: nameof(SyntaxKind.SealedKeyword));
break;
}
case CompilerDiagnosticIdentifiers.FieldCanNotBeBothVolatileAndReadOnly:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
break;
}
var fieldDeclaration = (FieldDeclarationSyntax)node;
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, fieldDeclaration, SyntaxKind.VolatileKeyword, additionalKey: nameof(SyntaxKind.VolatileKeyword));
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, fieldDeclaration, SyntaxKind.ReadOnlyKeyword, additionalKey: nameof(SyntaxKind.ReadOnlyKeyword));
break;
}
case CompilerDiagnosticIdentifiers.NewProtectedMemberDeclaredInSealedClass:
case CompilerDiagnosticIdentifiers.StaticClassesCannotContainProtectedMembers:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.ChangeAccessibility))
{
ModifiersCodeFixRegistrator.ChangeAccessibility(context, diagnostic, node, _publicOrInternalOrPrivate);
}
break;
}
case CompilerDiagnosticIdentifiers.VirtualOrAbstractmembersCannotBePrivate:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.ChangeAccessibility))
{
ModifiersCodeFixRegistrator.ChangeAccessibility(context, diagnostic, node, _publicOrInternalOrProtected);
}
break;
}
case CompilerDiagnosticIdentifiers.AbstractPropertiesCannotHavePrivateAccessors:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
ModifiersCodeFixRegistrator.RemoveAccessModifiers(context, diagnostic, node, additionalKey: CodeFixIdentifiers.RemoveInvalidModifier);
}
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.ChangeAccessibility))
{
ModifiersCodeFixRegistrator.ChangeAccessibility(context, diagnostic, node, _publicOrInternalOrProtected);
}
break;
}
case CompilerDiagnosticIdentifiers.StaticMemberCannotBeMarkedOverrideVirtualOrAbstract:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
break;
}
if (!node.IsParentKind(SyntaxKind.ClassDeclaration) ||
!((ClassDeclarationSyntax)node.Parent).Modifiers.Contains(SyntaxKind.StaticKeyword))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.StaticKeyword, additionalKey: nameof(SyntaxKind.StaticKeyword));
}
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.OverrideKeyword, additionalKey: nameof(SyntaxKind.OverrideKeyword));
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.VirtualKeyword, additionalKey: nameof(SyntaxKind.VirtualKeyword));
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.AbstractKeyword, additionalKey: nameof(SyntaxKind.AbstractKeyword));
break;
}
case CompilerDiagnosticIdentifiers.AsyncModifierCanOnlyBeUsedInMethodsThatHaveBody:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.AsyncKeyword);
}
break;
}
case CompilerDiagnosticIdentifiers.PartialMethodCannotHaveAccessModifiersOrVirtualAbstractOverrideNewSealedOrExternModifiers:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
break;
}
ModifiersCodeFixRegistrator.RemoveModifiers(context, diagnostic, node, f =>
{
switch (f.Kind())
{
case SyntaxKind.PublicKeyword:
case SyntaxKind.ProtectedKeyword:
case SyntaxKind.InternalKeyword:
case SyntaxKind.PrivateKeyword:
case SyntaxKind.VirtualKeyword:
case SyntaxKind.AbstractKeyword:
case SyntaxKind.OverrideKeyword:
case SyntaxKind.NewKeyword:
case SyntaxKind.SealedKeyword:
case SyntaxKind.ExternKeyword:
{
return(true);
}
}
return(false);
});
break;
}
case CompilerDiagnosticIdentifiers.ExtensionMethodMustBeStatic:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddStaticModifier))
{
AddStaticModifier(context, diagnostic, node, CodeFixIdentifiers.AddStaticModifier);
}
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveThisModifier))
{
var methodDeclaration = (MethodDeclarationSyntax)node;
ParameterSyntax parameter = methodDeclaration.ParameterList.Parameters.First();
SyntaxToken modifier = parameter.Modifiers.Find(SyntaxKind.ThisKeyword);
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, parameter, modifier, additionalKey: CodeFixIdentifiers.RemoveThisModifier);
}
break;
}
case CompilerDiagnosticIdentifiers.ExtensionMethodMustBeDefinedInNonGenericStaticClass:
{
if (!node.IsKind(SyntaxKind.ClassDeclaration))
{
return;
}
var classDeclaration = (ClassDeclarationSyntax)node;
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddStaticModifier) &&
!classDeclaration.IsStatic())
{
AddStaticModifier(context, diagnostic, node, CodeFixIdentifiers.AddStaticModifier);
}
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveThisModifier))
{
IEnumerable <ParameterSyntax> thisParameters = classDeclaration.Members
.Where(f => f.IsKind(SyntaxKind.MethodDeclaration))
.Cast <MethodDeclarationSyntax>()
.Select(f => f.ParameterList?.Parameters.FirstOrDefault())
.Where(f => f?.Modifiers.Contains(SyntaxKind.ThisKeyword) == true);
ModifiersCodeFixRegistrator.RemoveModifier(
context,
diagnostic,
thisParameters,
SyntaxKind.ThisKeyword,
title: "Remove 'this' modifier from extension methods",
additionalKey: CodeFixIdentifiers.RemoveThisModifier);
}
break;
}
case CompilerDiagnosticIdentifiers.NoDefiningDeclarationFoundForImplementingDeclarationOfPartialMethod:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.PartialKeyword);
}
break;
}
case CompilerDiagnosticIdentifiers.MethodHasParameterModifierThisWhichIsNotOnFirstParameter:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveThisModifier))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, token.Parent, token);
}
break;
}
case CompilerDiagnosticIdentifiers.CannotDeclareInstanceMembersInStaticClass:
case CompilerDiagnosticIdentifiers.StaticClassesCannotHaveInstanceConstructors:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddStaticModifier))
{
AddStaticModifier(context, diagnostic, node, CodeFixIdentifiers.AddStaticModifier);
}
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.MakeContainingClassNonStatic))
{
var classDeclaration = (ClassDeclarationSyntax)node.Parent;
ModifiersCodeFixRegistrator.RemoveModifier(
context,
diagnostic,
classDeclaration,
classDeclaration.Modifiers.Find(SyntaxKind.StaticKeyword),
title: "Make containing class non-static",
additionalKey: CodeFixIdentifiers.MakeContainingClassNonStatic);
}
break;
}
case CompilerDiagnosticIdentifiers.ElementsDefinedInNamespaceCannotBeExplicitlyDeclaredAsPrivateProtectedOrProtectedInternal:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.ChangeAccessibility))
{
ModifiersCodeFixRegistrator.ChangeAccessibility(context, diagnostic, node, _publicOrInternal);
}
break;
}
case CompilerDiagnosticIdentifiers.NamespaceAlreadyContainsDefinition:
case CompilerDiagnosticIdentifiers.TypeAlreadyContainsDefinition:
{
if (!Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddPartialModifier))
{
break;
}
if (!node.IsKind(
SyntaxKind.ClassDeclaration,
SyntaxKind.StructDeclaration,
SyntaxKind.InterfaceDeclaration,
SyntaxKind.MethodDeclaration))
{
return;
}
SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);
ISymbol symbol = semanticModel.GetDeclaredSymbol(node, context.CancellationToken);
ImmutableArray <SyntaxReference> syntaxReferences = symbol.DeclaringSyntaxReferences;
if (syntaxReferences.Length <= 1)
{
break;
}
ModifiersCodeFixRegistrator.AddModifier(
context,
diagnostic,
ImmutableArray.CreateRange(syntaxReferences, f => f.GetSyntax(context.CancellationToken)),
SyntaxKind.PartialKeyword);
break;
}
case CompilerDiagnosticIdentifiers.NoSuitableMethodFoundToOverride:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveInvalidModifier))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.OverrideKeyword);
}
break;
}
case CompilerDiagnosticIdentifiers.AsyncMethodsCannotHaveRefOrOutParameters:
case CompilerDiagnosticIdentifiers.IteratorsCannotHaveRefOrOutParameters:
case CompilerDiagnosticIdentifiers.ReadOnlyFieldCannotBePassedAsRefOrOutValue:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveRefModifier))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.RefKeyword, additionalKey: nameof(SyntaxKind.RefKeyword));
}
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.RemoveOutModifier))
{
ModifiersCodeFixRegistrator.RemoveModifier(context, diagnostic, node, SyntaxKind.OutKeyword, additionalKey: nameof(SyntaxKind.OutKeyword));
}
break;
}
case CompilerDiagnosticIdentifiers.CannotHaveInstancePropertyOrFieldInitializersInStruct:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddStaticModifier))
{
AddStaticModifier(context, diagnostic, node);
}
break;
}
case CompilerDiagnosticIdentifiers.MemberMustDeclareBodyBecauseItIsNotMarkedAbstractExternOrPartial:
{
if (Settings.IsCodeFixEnabled(CodeFixIdentifiers.AddModifierAbstract) &&
node.Kind() == SyntaxKind.MethodDeclaration &&
(node.Parent as ClassDeclarationSyntax)?.Modifiers.Contains(SyntaxKind.AbstractKeyword) == true)
{
ModifiersCodeFixRegistrator.AddModifier(context, diagnostic, node, SyntaxKind.AbstractKeyword);
}
break;
}
}
}
}