private void AnalyzeEnumDeclaration(SyntaxNodeAnalysisContext context)
{
var enumDeclaration = (EnumDeclarationSyntax)context.Node;
if (!enumDeclaration.AttributeLists.Any())
{
return;
}
EnumFlagValueStyle style = context.GetEnumFlagValueStyle();
if (style == EnumFlagValueStyle.None)
{
return;
}
if (context.SemanticModel.GetDeclaredSymbol(enumDeclaration, context.CancellationToken) is not INamedTypeSymbol typeSymbol)
{
return;
}
if (typeSymbol.TypeKind != TypeKind.Enum)
{
return;
}
if (!typeSymbol.HasAttribute(MetadataNames.System_FlagsAttribute))
{
return;
}
foreach (EnumMemberDeclarationSyntax member in enumDeclaration.Members)
{
ExpressionSyntax value = member.EqualsValue?.Value.WalkDownParentheses();
if (value != null)
{
if (value.IsKind(SyntaxKind.NumericLiteralExpression))
{
var literalExpression = (LiteralExpressionSyntax)value;
string text = literalExpression.Token.Text;
if (style == EnumFlagValueStyle.DecimalNumber)
{
if (text.StartsWith("0b", StringComparison.OrdinalIgnoreCase) ||
text.StartsWith("0x", StringComparison.OrdinalIgnoreCase))
{
Analyze(context, member, value, style);
}
}
else if (style == EnumFlagValueStyle.ShiftOperator)
{
Analyze(context, member, value, style);
}
}
else if (value.IsKind(SyntaxKind.LeftShiftExpression) &&
style == EnumFlagValueStyle.DecimalNumber)
{
Analyze(context, member, value, style);
}
}
}
}
