public static void AnalyzeNamedType(SymbolAnalysisContext context)
{
var enumSymbol = (INamedTypeSymbol)context.Symbol;
if (enumSymbol.TypeKind != TypeKind.Enum)
{
return;
}
if (!enumSymbol.HasAttribute(MetadataNames.System_FlagsAttribute))
{
return;
}
var infos = default(ImmutableArray <EnumFieldSymbolInfo>);
foreach (ISymbol member in enumSymbol.GetMembers())
{
if (member is IFieldSymbol fieldSymbol)
{
if (!fieldSymbol.HasConstantValue)
{
return;
}
var info = new EnumFieldSymbolInfo(fieldSymbol);
if (info.IsComposite())
{
var declaration = (EnumMemberDeclarationSyntax)info.Symbol.GetSyntax(context.CancellationToken);
ExpressionSyntax valueExpression = declaration.EqualsValue?.Value;
if (valueExpression != null &&
(valueExpression.IsKind(SyntaxKind.NumericLiteralExpression) ||
valueExpression
.DescendantNodes()
.Any(f => f.IsKind(SyntaxKind.NumericLiteralExpression))))
{
if (infos.IsDefault)
{
infos = EnumFieldSymbolInfo.CreateRange(enumSymbol);
if (infos.IsDefault)
{
return;
}
}
List <EnumFieldSymbolInfo> values = info.Decompose(infos);
if (values?.Count > 1)
{
context.ReportDiagnostic(
DiagnosticDescriptors.DeclareEnumValueAsCombinationOfNames,
valueExpression);
}
}
}
}
}
}
