NumberFormatterBase.cs

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using System.Text;
 
namespace System.Xml.Xsl.Runtime;
 
internal abstract class NumberFormatterBase
{
    private static readonly int[] s_romanDigitValue = new int[13]
    {
        1, 4, 5, 9, 10, 40, 50, 90, 100, 400,
        500, 900, 1000
    };
 
    public static void ConvertToAlphabetic(StringBuilder sb, double val, char firstChar, int totalChars)
    {
        char[] array = new char[7];
        int num = 7;
        int num2 = (int)val;
        while (num2 > totalChars)
        {
            int num3 = --num2 / totalChars;
            array[--num] = (char)(firstChar + (num2 - num3 * totalChars));
            num2 = num3;
        }
        array[--num] = (char)(firstChar + --num2);
        sb.Append(array, num, 7 - num);
    }
 
    public static void ConvertToRoman(StringBuilder sb, double val, bool upperCase)
    {
        int num = (int)val;
        string value = (upperCase ? "IIVIXXLXCCDCM" : "iivixxlxccdcm");
        int num2 = s_romanDigitValue.Length;
        while (num2-- != 0)
        {
            while (num >= s_romanDigitValue[num2])
            {
                num -= s_romanDigitValue[num2];
                sb.Append(value, num2, 1 + (num2 & 1));
            }
        }
    }
}