public RxNode <TLetter> MapCodepoints(bool negate, RangeSet <Codepoint> codepointRanges, bool caseSensitive)
{
if (!caseSensitive)
{
codepointRanges = new RangeSet <Codepoint>(codepointRanges.Expand().SelectMany(this.GenerateCaseInsensitiveCodepoints).Condense());
}
if (negate)
{
codepointRanges = Codepoints.Valid - codepointRanges;
}
if (codepointRanges.Count == 0)
{
return(RxEmpty <TLetter> .Default);
}
return(MapCodepoints(codepointRanges));
}
public static RangeSet <Codepoint> CaseInsensitive(this RangeSet <Codepoint> input)
{
var result = input;
foreach (var c in input.Expand())
{
if (Codepoint.IsUpper(c))
{
result |= Codepoint.ToLowerInvariant(c);
}
else if (Codepoint.IsLower(c))
{
result |= Codepoint.ToUpperInvariant(c);
}
}
return(result);
}
