private string GetStringSortKey(IConvertible value)
{
string text = value.ToString(null);
if (_compareOptions.HasFlag(CompareOptions.Ordinal))
{
return(text);
}
if (_compareOptions.HasFlag(CompareOptions.OrdinalIgnoreCase))
{
return(text.ToUpperInvariant());
}
return(ToComparableBase64String(_compareInfo.GetSortKey(text, _compareOptions).KeyData));
}
private NaturalStringComparer(CompareOptions options, CultureInfo culture = null)
{
_options = options;
_ignoreCase = _options.HasFlag(CompareOptions.IgnoreCase);
_culture = culture;
if (culture != null)
{
_mappings = MappingCache.GetMapping(culture, _ignoreCase);
}
else
{
_mappings = Array.Empty <ushort>();
}
}
/// <inheritdoc />
public object ReadValue <TInput>(ref Reader <TInput> reader, Field field)
{
ReferenceCodec.MarkValueField(reader.Session);
uint type = default;
CompareOptions options = default;
int lcid = default;
uint fieldId = 0;
while (true)
{
var header = reader.ReadFieldHeader();
if (header.IsEndBaseOrEndObject)
{
break;
}
fieldId += header.FieldIdDelta;
switch (fieldId)
{
case 0:
type = UInt32Codec.ReadValue(ref reader, header);
break;
case 1:
options = (CompareOptions)UInt64Codec.ReadValue(ref reader, header);
break;
case 2:
lcid = Int32Codec.ReadValue(ref reader, header);
break;
default:
reader.ConsumeUnknownField(header);
break;
}
}
if (type == 0)
{
return(null);
}
else if (type == 1)
{
if (options.HasFlag(CompareOptions.IgnoreCase))
{
return(StringComparer.OrdinalIgnoreCase);
}
else
{
return(StringComparer.Ordinal);
}
}
else if (type == 2)
{
if (lcid == CultureInfo.InvariantCulture.LCID)
{
if (options == CompareOptions.None)
{
return(StringComparer.InvariantCulture);
}
else if (options == CompareOptions.IgnoreCase)
{
return(StringComparer.InvariantCultureIgnoreCase);
}
// Otherwise, perhaps some other options were specified, in which case we fall-through to create a new comparer.
}
var cultureInfo = CultureInfo.GetCultureInfo(lcid);
var result = StringComparer.Create(cultureInfo, options);
return(result);
}
ThrowNotSupported(field, type);
return(null);
}