/// <inheritdoc/>
protected override async Task RegisterCodeFixesAsync(DocumentEditorCodeFixContext context)
{
var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken)
.ConfigureAwait(false);
var semanticModel = await context.Document.GetSemanticModelAsync(context.CancellationToken)
.ConfigureAwait(false);
foreach (var diagnostic in context.Diagnostics)
{
if (syntaxRoot.TryFindNode(diagnostic, out ArgumentSyntax? argument) &&
argument.Expression is LiteralExpressionSyntax literal &&
semanticModel.LookupSymbols(argument.SpanStart, name: literal.Token.ValueText).TryFirst(out var member))
{
context.RegisterCodeFix(
"Use nameof",
async(editor, cancellationToken) =>
{
var replacement = await editor.SymbolAccessAsync(member, literal, cancellationToken)
.ConfigureAwait(false);
_ = editor.ReplaceNode(
literal,
x => InpcFactory.Nameof(replacement).WithTriviaFrom(x));
},
nameof(UseNameofFix),
diagnostic);
}
}
}
/// <inheritdoc/>
protected override async Task RegisterCodeFixesAsync(DocumentEditorCodeFixContext context)
{
var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken)
.ConfigureAwait(false);
foreach (var diagnostic in context.Diagnostics)
{
if (syntaxRoot.TryFindNode(diagnostic, out AssignmentExpressionSyntax? assignment) &&
diagnostic.AdditionalLocations.TrySingle(out var additionalLocation) &&
syntaxRoot.FindNode(additionalLocation.SourceSpan) is ExpressionSyntax fieldAccess)
{
context.RegisterCodeFix(
"Set backing field.",
(e, cancellationToken) => e.ReplaceNode(
assignment.Left,
(x, _) => Qualify(fieldAccess).WithTriviaFrom(x)),
nameof(SetBackingFieldFix),
diagnostic);
ExpressionSyntax Qualify(ExpressionSyntax expression)
{
if (expression is IdentifierNameSyntax identifierName &&
(Scope.HasParameter(assignment, identifierName.Identifier.ValueText) ||
Scope.HasLocal(assignment, identifierName.Identifier.ValueText)))
{
return(InpcFactory.SymbolAccess(identifierName.Identifier.ValueText, CodeStyleResult.Yes));
}
return(expression);
}
}
}
}
protected override async Task RegisterCodeFixesAsync(DocumentEditorCodeFixContext context)
{
var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken)
.ConfigureAwait(false);
var semanticModel = await context.Document.GetSemanticModelAsync(context.CancellationToken)
.ConfigureAwait(false);
foreach (var diagnostic in context.Diagnostics)
{
if (syntaxRoot.TryFindNodeOrAncestor(diagnostic, out ExpressionStatementSyntax? onPropertyChangedStatement) &&
onPropertyChangedStatement.TryFirstAncestor(out AccessorDeclarationSyntax? setter) &&
setter.IsKind(SyntaxKind.SetAccessorDeclaration) &&
setter.Body is { } body)
{
if (Setter.TryFindSingleAssignment(setter, out var assignment) &&
assignment.Parent is ExpressionStatementSyntax assignmentStatement &&
body.Statements.IndexOf(assignmentStatement) == 0)
{
if (semanticModel.TryGetSymbol(assignment.Left, CancellationToken.None, out var assignedSymbol) &&
assignedSymbol.Kind == SymbolKind.Field &&
semanticModel.TryGetSymbol(setter, context.CancellationToken, out IMethodSymbol? setterSymbol) &&
TrySet.TryFind(setterSymbol.ContainingType, semanticModel, context.CancellationToken, out var trySetMethod) &&
TrySet.CanCreateInvocation(trySetMethod, out _) &&
setter.TryFirstAncestor(out PropertyDeclarationSyntax? property))
{
if (setter.Body.Statements.Count == 2)
{
context.RegisterCodeFix(
trySetMethod.DisplaySignature(),
async(editor, cancellationToken) =>
{
var trySet = await editor.TrySetInvocationAsync(trySetMethod, assignment.Left, assignment.Right, property, cancellationToken)
.ConfigureAwait(false);
_ = editor.ReplaceNode(
setter,
x => x.AsExpressionBody(trySet));
},
trySetMethod.MetadataName,
diagnostic);
}
}
context.RegisterCodeFix(
"Check that value is different before notifying.",
(editor, cancellationToken) => editor.InsertBefore(
assignmentStatement,
InpcFactory.IfReturn(
InpcFactory.Equals(
assignment.Right,
assignment.Left,
editor.SemanticModel,
cancellationToken))),
nameof(CheckIfDifferentBeforeNotifyFix),
diagnostic);
}
internal static async Task <ExpressionSyntax> AddBackingFieldAsync(this DocumentEditor editor, PropertyDeclarationSyntax property, CancellationToken cancellationToken)
{
var backingField = editor.AddBackingField(property);
var qualifyFieldAccessAsync = property.Modifiers.Any(SyntaxKind.StaticKeyword)
? CodeStyleResult.No
: await editor.QualifyFieldAccessAsync(cancellationToken)
.ConfigureAwait(false);
return(InpcFactory.SymbolAccess(backingField.Name(), qualifyFieldAccessAsync));
}
internal static async Task <ExpressionStatementSyntax> OnPropertyChangedInvocationStatementAsync(this DocumentEditor editor, IMethodSymbol invoker, string propertyName, CancellationToken cancellationToken)
{
var qualifyMethodAccess = await editor.QualifyMethodAccessAsync(cancellationToken)
.ConfigureAwait(false);
var qualifyPropertyAccess = await editor.QualifyPropertyAccessAsync(cancellationToken)
.ConfigureAwait(false);
return(InpcFactory.OnPropertyChangedInvocationStatement(
InpcFactory.SymbolAccess(invoker.Name, qualifyMethodAccess),
InpcFactory.Nameof(InpcFactory.SymbolAccess(propertyName, qualifyPropertyAccess))));
}
private static ParameterSyntax AsCallerMemberName(ParameterSyntax parameter, bool nullabilityAnnotationsEnabled)
{
parameter = parameter.AddAttributeLists(InpcFactory.CallerMemberNameAttributeList)
.WithDefault(SyntaxFactory.EqualsValueClause(SyntaxFactory.LiteralExpression(SyntaxKind.NullLiteralExpression)));
if (nullabilityAnnotationsEnabled)
{
parameter = parameter.WithType(InpcFactory.WithNullability(parameter.Type, nullable: true));
}
return(parameter);
}
internal static async Task AddOnPropertyChangedMethodAsync(this DocumentEditor editor, ClassDeclarationSyntax classDeclaration, bool nullabilityAnnotationsEnabled, CancellationToken cancellationToken)
{
var qualifyAccess = classDeclaration.Modifiers.Any(SyntaxKind.StaticKeyword)
? CodeStyleResult.No
: await editor.QualifyEventAccessAsync(cancellationToken)
.ConfigureAwait(false);
_ = editor.AddMethod(
classDeclaration,
InpcFactory.OnPropertyChangedDeclaration(
qualifyAccess,
classDeclaration.Modifiers.Any(SyntaxKind.SealedKeyword),
classDeclaration.Modifiers.Any(SyntaxKind.StaticKeyword),
CallerMemberNameAttribute.IsAvailable(editor.SemanticModel),
nullabilityAnnotationsEnabled));
}
internal static async Task <ExpressionStatementSyntax> OnPropertyChangedInvocationStatementAsync(this DocumentEditor editor, IMethodSymbol invoker, PropertyDeclarationSyntax containingProperty, CancellationToken cancellationToken)
{
if (invoker.Parameters.TrySingle(out var parameter))
{
var qualifyMethodAccess = await editor.QualifyMethodAccessAsync(cancellationToken)
.ConfigureAwait(false);
var nameExpression = await editor.NameOfContainingAsync(containingProperty, parameter, cancellationToken)
.ConfigureAwait(false);
return(InpcFactory.OnPropertyChangedInvocationStatement(
InpcFactory.SymbolAccess(invoker.Name, qualifyMethodAccess),
nameExpression));
}
throw new InvalidOperationException("Could not find name parameter.");
}
internal static async Task <InvocationExpressionSyntax> TrySetInvocationAsync(this DocumentEditor editor, IMethodSymbol trySet, ExpressionSyntax field, ExpressionSyntax value, PropertyDeclarationSyntax containingProperty, CancellationToken cancellationToken)
{
if (trySet.TryFindParameter(KnownSymbol.String, out var nameParameter))
{
var qualifyMethodAccess = await editor.QualifyMethodAccessAsync(cancellationToken)
.ConfigureAwait(false);
var nameExpression = await editor.NameOfContainingAsync(containingProperty, nameParameter, cancellationToken)
.ConfigureAwait(false);
return(InpcFactory.TrySetInvocation(
qualifyMethodAccess,
trySet,
field,
value,
nameExpression));
}
throw new InvalidOperationException("Could not find name parameter.");
}
protected override async Task RegisterCodeFixesAsync(DocumentEditorCodeFixContext context)
{
var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken)
.ConfigureAwait(false);
foreach (var diagnostic in context.Diagnostics)
{
if (syntaxRoot.TryFindNode(diagnostic, out InvocationExpressionSyntax? invocation) &&
invocation.ArgumentList is { } argumentList&&
TryGetMethodName(out var name))
{
if (argumentList.Arguments.Count == 2)
{
context.RegisterCodeFix(
$"Use {name}",
editor => editor.ReplaceNode(
invocation.Expression,
x => SyntaxFactory.IdentifierName(name).WithTriviaFrom(x)),
nameof(EqualityFix),
diagnostic);
}
else if (argumentList.Arguments.TrySingle(out var argument) &&
invocation.Expression is MemberAccessExpressionSyntax {
Expression: { } expression
})
{
context.RegisterCodeFix(
$"Use {name}",
editor => editor.ReplaceNode(
invocation,
x => InpcFactory.Equals(null, name, expression, argument.Expression).WithTriviaFrom(x)),
nameof(EqualityFix),
diagnostic);
}
}
if (syntaxRoot.TryFindNode(diagnostic, out BinaryExpressionSyntax? binary) &&
TryGetMethodName(out name))
{
switch (binary.Kind())
{
case SyntaxKind.EqualsExpression:
context.RegisterCodeFix(
$"Use {name}",
editor => editor.ReplaceNode(
binary,
x => InpcFactory.Equals(null, name, x.Left.WithoutTrivia(), x.Right.WithoutTrivia()).WithTriviaFrom(x)),
nameof(EqualityFix),
diagnostic);
break;
case SyntaxKind.NotEqualsExpression:
context.RegisterCodeFix(
$"Use !{name}",
editor => editor.ReplaceNode(
binary,
x => SyntaxFactory.PrefixUnaryExpression(
SyntaxKind.LogicalNotExpression,
InpcFactory.Equals(
null,
name,
x.Left.WithoutTrivia(),
x.Right.WithoutTrivia()))
.WithTriviaFrom(x)),
nameof(EqualityFix),
diagnostic);
break;
}
}
bool TryGetMethodName(out string result)
{
if (diagnostic.Id == Descriptors.INPC006UseReferenceEqualsForReferenceTypes.Id)
{
result = nameof(ReferenceEquals);
return(true);
}
if (diagnostic.Id == Descriptors.INPC006UseObjectEqualsForReferenceTypes.Id)
{
result = nameof(Equals);
return(true);
}
result = null !;
return(false);
}
}
protected override async Task RegisterCodeFixesAsync(DocumentEditorCodeFixContext context)
{
var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken)
.ConfigureAwait(false);
var semanticModel = await context.Document.GetSemanticModelAsync(context.CancellationToken)
.ConfigureAwait(false);
foreach (var diagnostic in context.Diagnostics)
{
if (syntaxRoot.TryFindNodeOrAncestor(diagnostic, out PropertyDeclarationSyntax? propertyDeclaration) &&
propertyDeclaration.Parent is ClassDeclarationSyntax classDeclarationSyntax &&
semanticModel.TryGetSymbol(classDeclarationSyntax, context.CancellationToken, out var type))
{
if (TrySet.TryFind(type, semanticModel, context.CancellationToken, out var trySetMethod) &&
TrySet.CanCreateInvocation(trySetMethod, out _))
{
if (Property.IsMutableAutoProperty(propertyDeclaration, out var getter, out var setter))
{
context.RegisterCodeFix(
trySetMethod.DisplaySignature(),
(editor, cancellationToken) => TrySet(editor, cancellationToken),
trySetMethod.MetadataName,
diagnostic);
async Task TrySet(DocumentEditor editor, CancellationToken cancellationToken)
{
var fieldAccess = await editor.AddBackingFieldAsync(propertyDeclaration, cancellationToken)
.ConfigureAwait(false);
var trySet = await editor.TrySetInvocationAsync(trySetMethod, fieldAccess, InpcFactory.Value, propertyDeclaration, cancellationToken)
.ConfigureAwait(false);
_ = editor.ReplaceNode(
getter,
x => x.AsExpressionBody(fieldAccess))
.ReplaceNode(
setter,
x => x.AsExpressionBody(trySet));
if (propertyDeclaration.Initializer != null)
{
editor.ReplaceNode(
propertyDeclaration,
(node, g) => ((PropertyDeclarationSyntax)node).WithoutInitializer());
}
_ = editor.FormatNode(propertyDeclaration);
}
}
else if (IsSimpleAssignmentOnly(propertyDeclaration, out _, out var assignment))
{
context.RegisterCodeFix(
trySetMethod.DisplaySignature(),
async(editor, cancellationToken) =>
{
var trySet = await editor.TrySetInvocationAsync(trySetMethod, assignment.Left, assignment.Right, propertyDeclaration, cancellationToken)
.ConfigureAwait(false);
_ = editor.ReplaceNode(
assignment,
x => trySet);
},
trySetMethod.MetadataName,
diagnostic);
}
}
if (OnPropertyChanged.TryFind(type, semanticModel, context.CancellationToken, out var invoker) &&
invoker.Parameters.TrySingle(out var parameter) &&
parameter.Type.IsEither(KnownSymbol.String, KnownSymbol.PropertyChangedEventArgs))
{
if (Property.IsMutableAutoProperty(propertyDeclaration, out var getter, out var setter) &&
semanticModel.TryGetSymbol(propertyDeclaration, context.CancellationToken, out var property))
{
context.RegisterCodeFix(
NotifyWhenValueChanges,
(editor, cancellationToken) =>
NotifyWhenValueChangesAsync(editor, cancellationToken),
nameof(NotifyWhenValueChangesAsync),
diagnostic);
async Task NotifyWhenValueChangesAsync(DocumentEditor editor, CancellationToken cancellationToken)
{
var backingField = await editor.AddBackingFieldAsync(propertyDeclaration, cancellationToken)
.ConfigureAwait(false);
var onPropertyChanged = await editor.OnPropertyChangedInvocationStatementAsync(invoker, propertyDeclaration, cancellationToken)
.ConfigureAwait(false);
_ = editor.ReplaceNode(
getter,
x => x.AsExpressionBody(backingField)
.WithTrailingLineFeed());
_ = editor.ReplaceNode(
setter,
x => x.AsBlockBody(
InpcFactory.IfReturn(
InpcFactory.Equals(property.Type, InpcFactory.Value, backingField, editor.SemanticModel)),
SyntaxFactory.ExpressionStatement(SyntaxFactory.AssignmentExpression(SyntaxKind.SimpleAssignmentExpression, backingField, InpcFactory.Value)),
onPropertyChanged));
if (propertyDeclaration.Initializer != null)
{
_ = editor.ReplaceNode(
propertyDeclaration,
x => x.WithoutInitializer());
}
_ = editor.FormatNode(propertyDeclaration);
}
}
/// <inheritdoc/>
protected override async Task RegisterCodeFixesAsync(DocumentEditorCodeFixContext context)
{
var syntaxRoot = await context.Document.GetSyntaxRootAsync(context.CancellationToken)
.ConfigureAwait(false);
var semanticModel = await context.Document.GetSemanticModelAsync(context.CancellationToken)
.ConfigureAwait(false);
foreach (var diagnostic in context.Diagnostics)
{
if (diagnostic.Properties.TryGetValue(MutationAnalyzer.PropertyNameKey, out var propertyName))
{
if (syntaxRoot.TryFindNodeOrAncestor(diagnostic, out ExpressionSyntax? expression) &&
expression.TryFirstAncestor(out ClassDeclarationSyntax? classDeclaration) &&
semanticModel.TryGetNamedType(classDeclaration, context.CancellationToken, out var type) &&
OnPropertyChanged.TryFind(type, semanticModel, context.CancellationToken, out var onPropertyChangedMethod) &&
onPropertyChangedMethod.Parameters.TrySingle(out var parameter) &&
parameter.Type.IsEither(KnownSymbol.String, KnownSymbol.PropertyChangedEventArgs))
{
if (expression is InvocationExpressionSyntax trySet &&
semanticModel.TryGetSymbol(trySet, context.CancellationToken, out var trySetMethod) &&
TrySet.IsMatch(trySetMethod, semanticModel, context.CancellationToken) != AnalysisResult.No)
{
switch (trySet.Parent)
{
case ExpressionStatementSyntax expressionStatement:
context.RegisterCodeFix(
$"Notify that property {propertyName} changes.",
async(editor, cancellationToken) =>
{
var onPropertyChangedStatement = await editor.OnPropertyChangedInvocationStatementAsync(onPropertyChangedMethod, propertyName, cancellationToken)
.ConfigureAwait(false);
editor.ReplaceNode(
expressionStatement,
InpcFactory.IfStatement(
trySet,
onPropertyChangedStatement));
if (expressionStatement.TryFirstAncestor(out AccessorDeclarationSyntax? setter))
{
_ = editor.FormatNode(setter);
}
},
nameof(NotifyForDependentPropertyFix),
diagnostic);
break;
case ArrowExpressionClauseSyntax {
Parent: AccessorDeclarationSyntax setter
} :
context.RegisterCodeFix(
$"Notify that property {propertyName} changes.",
async(editor, cancellationToken) =>
{
var onPropertyChangedStatement = await editor.OnPropertyChangedInvocationStatementAsync(onPropertyChangedMethod, propertyName, cancellationToken)
.ConfigureAwait(false);
_ = editor.ReplaceNode(
setter,
x => x.AsBlockBody(
InpcFactory.IfStatement(
trySet,
onPropertyChangedStatement)));
},
nameof(NotifyForDependentPropertyFix),
diagnostic);
break;