DecimalFormatter.cs

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using System.Globalization;
using System.Text;
 
namespace System.Xml.Xsl.Runtime;
 
internal sealed class DecimalFormatter
{
    private readonly NumberFormatInfo _posFormatInfo;
 
    private readonly NumberFormatInfo _negFormatInfo;
 
    private readonly string _posFormat;
 
    private readonly string _negFormat;
 
    private readonly char _zeroDigit;
 
    public DecimalFormatter(string formatPicture, DecimalFormat decimalFormat)
    {
        if (formatPicture.Length == 0)
        {
            throw XsltException.Create(System.SR.Xslt_InvalidFormat);
        }
        _zeroDigit = decimalFormat.zeroDigit;
        _posFormatInfo = (NumberFormatInfo)decimalFormat.info.Clone();
        StringBuilder stringBuilder = new StringBuilder();
        bool flag = true;
        bool flag2 = false;
        bool flag3 = false;
        bool flag4 = false;
        bool flag5 = false;
        bool flag6 = false;
        char c = _posFormatInfo.NumberDecimalSeparator[0];
        char c2 = _posFormatInfo.NumberGroupSeparator[0];
        char c3 = _posFormatInfo.PercentSymbol[0];
        char c4 = _posFormatInfo.PerMilleSymbol[0];
        int num = 0;
        int num2 = 0;
        int num3 = -1;
        int num4 = -1;
        for (int i = 0; i < formatPicture.Length; i++)
        {
            char c5 = formatPicture[i];
            if (c5 == decimalFormat.digit)
            {
                if (flag3 && flag)
                {
                    throw XsltException.Create(System.SR.Xslt_InvalidFormat1, formatPicture);
                }
                num4 = stringBuilder.Length;
                flag4 = (flag6 = true);
                stringBuilder.Append('#');
            }
            else if (c5 == decimalFormat.zeroDigit)
            {
                if (flag4 && !flag)
                {
                    throw XsltException.Create(System.SR.Xslt_InvalidFormat2, formatPicture);
                }
                num4 = stringBuilder.Length;
                flag3 = (flag6 = true);
                stringBuilder.Append('0');
            }
            else if (c5 == decimalFormat.patternSeparator)
            {
                if (!flag6)
                {
                    throw XsltException.Create(System.SR.Xslt_InvalidFormat8);
                }
                if (flag2)
                {
                    throw XsltException.Create(System.SR.Xslt_InvalidFormat3, formatPicture);
                }
                flag2 = true;
                if (num3 < 0)
                {
                    num3 = num4 + 1;
                }
                num2 = RemoveTrailingComma(stringBuilder, num, num3);
                if (num2 > 9)
                {
                    num2 = 0;
                }
                _posFormatInfo.NumberGroupSizes = new int[1] { num2 };
                if (!flag5)
                {
                    _posFormatInfo.NumberDecimalDigits = 0;
                }
                _posFormat = stringBuilder.ToString();
                stringBuilder.Length = 0;
                num3 = -1;
                num4 = -1;
                num = 0;
                flag4 = (flag3 = (flag6 = false));
                flag5 = false;
                flag = true;
                _negFormatInfo = (NumberFormatInfo)decimalFormat.info.Clone();
                _negFormatInfo.NegativeSign = string.Empty;
            }
            else if (c5 == c)
            {
                if (flag5)
                {
                    throw XsltException.Create(System.SR.Xslt_InvalidFormat5, formatPicture);
                }
                num3 = stringBuilder.Length;
                flag5 = true;
                flag4 = (flag3 = (flag = false));
                stringBuilder.Append('.');
            }
            else if (c5 == c2)
            {
                num = stringBuilder.Length;
                num4 = num;
                stringBuilder.Append(',');
            }
            else if (c5 == c3)
            {
                stringBuilder.Append('%');
            }
            else if (c5 == c4)
            {
                stringBuilder.Append('‰');
            }
            else if (c5 == '\'')
            {
                int num5 = formatPicture.IndexOf('\'', i + 1);
                if (num5 < 0)
                {
                    num5 = formatPicture.Length - 1;
                }
                stringBuilder.Append(formatPicture, i, num5 - i + 1);
                i = num5;
            }
            else
            {
                if ((('0' <= c5 && c5 <= '9') || c5 == '\a') && decimalFormat.zeroDigit != '0')
                {
                    stringBuilder.Append('\a');
                }
                if ("0#.,%‰Ee\\'\";".Contains(c5))
                {
                    stringBuilder.Append('\\');
                }
                stringBuilder.Append(c5);
            }
        }
        if (!flag6)
        {
            throw XsltException.Create(System.SR.Xslt_InvalidFormat8);
        }
        NumberFormatInfo numberFormatInfo = (flag2 ? _negFormatInfo : _posFormatInfo);
        if (num3 < 0)
        {
            num3 = num4 + 1;
        }
        num2 = RemoveTrailingComma(stringBuilder, num, num3);
        if (num2 > 9)
        {
            num2 = 0;
        }
        numberFormatInfo.NumberGroupSizes = new int[1] { num2 };
        if (!flag5)
        {
            numberFormatInfo.NumberDecimalDigits = 0;
        }
        if (flag2)
        {
            _negFormat = stringBuilder.ToString();
        }
        else
        {
            _posFormat = stringBuilder.ToString();
        }
    }
 
    private static int RemoveTrailingComma(StringBuilder builder, int commaIndex, int decimalIndex)
    {
        if (commaIndex > 0 && commaIndex == decimalIndex - 1)
        {
            builder.Remove(decimalIndex - 1, 1);
        }
        else if (decimalIndex > commaIndex)
        {
            return decimalIndex - commaIndex - 1;
        }
        return 0;
    }
 
    public string Format(double value)
    {
        NumberFormatInfo numberFormatInfo;
        string text;
        if (value < 0.0 && _negFormatInfo != null)
        {
            numberFormatInfo = _negFormatInfo;
            text = _negFormat;
        }
        else
        {
            numberFormatInfo = _posFormatInfo;
            text = _posFormat;
        }
        string text2 = value.ToString(text, numberFormatInfo);
        if (_zeroDigit != '0')
        {
            StringBuilder stringBuilder = new StringBuilder(text2.Length);
            int num = _zeroDigit - 48;
            for (int i = 0; i < text2.Length; i++)
            {
                char c = text2[i];
                switch (c)
                {
                case '0':
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                case '8':
                case '9':
                    c = (char)(c + (ushort)num);
                    break;
                case '\a':
                    c = text2[++i];
                    break;
                }
                stringBuilder.Append(c);
            }
            text2 = stringBuilder.ToString();
        }
        return text2;
    }
 
    public static string Format(double value, string formatPicture, DecimalFormat decimalFormat)
    {
        return new DecimalFormatter(formatPicture, decimalFormat).Format(value);
    }
}