private static void HandleAssignment(SyntaxNodeAnalysisContext context)
{
if (context.IsExcludedFromAnalysis())
{
return;
}
if (context.Node is AssignmentExpressionSyntax assignment)
{
if (assignment.Right is IdentifierNameSyntax identifier &&
context.ContainingSymbol is IMethodSymbol method &&
method.DeclaredAccessibility.IsEither(Accessibility.Internal, Accessibility.Protected, Accessibility.Public) &&
method.Parameters.TryFirst(x => x.Name == identifier.Identifier.ValueText, out var parameter) &&
parameter.Type.IsReferenceType &&
!parameter.HasExplicitDefaultValue &&
!NullCheck.IsChecked(parameter, assignment.FirstAncestor <BaseMethodDeclarationSyntax>(), context.SemanticModel, context.CancellationToken))
{
context.ReportDiagnostic(Diagnostic.Create(GU0012NullCheckParameter.Descriptor, assignment.Right.GetLocation()));
}
if (AreSame(assignment.Left, assignment.Right))
{
if (assignment.FirstAncestorOrSelf <InitializerExpressionSyntax>() != null)
{
return;
}
var left = context.SemanticModel.GetSymbolSafe(assignment.Left, context.CancellationToken);
var right = context.SemanticModel.GetSymbolSafe(assignment.Right, context.CancellationToken);
if (!ReferenceEquals(left, right))
{
return;
}
context.ReportDiagnostic(Diagnostic.Create(GU0010DoNotAssignSameValue.Descriptor, assignment.GetLocation()));
}
}
}
