public static OneOrMany <EnumFieldInfo> GetConstituentFields(object value, INamedTypeSymbol enumType)
{
ImmutableArray <EnumFieldInfo> fields = GetFields(enumType);
ulong valueAsULong = GetValueAsUInt64(value, enumType);
if (!enumType.HasAttribute(MetadataNames.System_FlagsAttribute) ||
valueAsULong == 0)
{
return(OneOrMany.Create(FindField(fields, valueAsULong)));
}
return(GetConstituentFields(valueAsULong, fields));
}
public static OneOrMany <EnumFieldSymbolInfo> GetConstituentFields(object value, INamedTypeSymbol enumType)
{
EnumSymbolInfo enumInfo = EnumSymbolInfo.Create(enumType);
ulong convertedValue = SymbolUtility.GetEnumValueAsUInt64(value, enumType);
if (!enumType.HasAttribute(MetadataNames.System_FlagsAttribute) ||
convertedValue == 0)
{
return(OneOrMany.Create(FindField(enumInfo, convertedValue)));
}
return(GetConstituentFields(convertedValue, enumInfo));
}
public static OneOrMany <EnumFieldInfo> GetConstituentFields(ulong value, ImmutableArray <EnumFieldInfo> fields)
{
ImmutableArray <EnumFieldInfo> .Builder builder = null;
ulong result = value;
for (int i = fields.Length - 1; i >= 0; i--)
{
ulong val = fields[i].Value;
if (val != 0 &&
(result & val) == val)
{
if (builder == null)
{
if (result == val)
{
return(OneOrMany.Create(fields[i]));
}
builder = ImmutableArray.CreateBuilder <EnumFieldInfo>();
}
builder.Add(fields[i]);
result -= val;
if (result == 0)
{
break;
}
}
}
if (result == 0 &&
builder != null)
{
builder.Reverse();
return(OneOrMany.Create(builder.ToImmutableArray()));
}
return(default);
