/// <summary>
/// Gets the set of all fields that should not participate in Equals and GetHashCode generated because they're
/// the target of [IgnoreDuringEquals].
/// </summary>
public static ISet <FieldDefDeclaration> GetIgnoredFields(IAnnotationRepositoryService annotations,
ICompilerAdapterService compilerAdapterService)
{
HashSet <FieldDefDeclaration> fields = new HashSet <FieldDefDeclaration>();
IEnumerator <IAnnotationInstance> ignoredFieldsAnnotations =
annotations.GetAnnotationsOfType(typeof(IgnoreDuringEqualsAttribute), false, false);
while (ignoredFieldsAnnotations.MoveNext())
{
IAnnotationInstance annotationInstance = ignoredFieldsAnnotations.Current;
MetadataDeclaration targetElement = annotationInstance.TargetElement;
if (targetElement is FieldDefDeclaration field)
{
fields.Add(field);
}
else if (targetElement is PropertyDeclaration propertyDeclaration)
{
FieldDefDeclaration backingField = compilerAdapterService.GetBackingField(propertyDeclaration);
if (backingField != null)
{
fields.Add(backingField);
}
else
{
// The property is not an automatic property.
// It's ignored, because there is no backing field and we make equality by fields.
// We could emit a warning but I don't think that's a great idea. Like, yeah, ignoring a
// non-automatic property has no effect but so what: it's ignored, just like the user wanted.
}
}
}
return(fields);
}
