CharUtil.cs

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using System.Globalization;
 
namespace System.Xml.Xsl.Runtime;
 
internal static class CharUtil
{
    public static bool IsAlphaNumeric(char ch)
    {
        int unicodeCategory = (int)CharUnicodeInfo.GetUnicodeCategory(ch);
        if (unicodeCategory > 4)
        {
            if (unicodeCategory <= 10)
            {
                return unicodeCategory >= 8;
            }
            return false;
        }
        return true;
    }
 
    public static bool IsDecimalDigitOne(char ch)
    {
        int unicodeCategory = (int)CharUnicodeInfo.GetUnicodeCategory(ch = (char)(ch - 1));
        if (unicodeCategory == 8)
        {
            return char.GetNumericValue(ch) == 0.0;
        }
        return false;
    }
}