static string FormatNumber <T>(T number, int fieldWidth, SprintfFlag flag, string specifier) where T : IComparable <T>, IFormattable
{
var zero = default(T);
var culture = CultureInfo.InvariantCulture;
if (flag == SprintfFlag.WriteSign)
{
if (number.CompareTo(zero) >= 0)
{
return((culture.NumberFormat.PositiveSign + number.ToString(specifier, culture)).PadLeft(fieldWidth, ' '));
}
else
{
return(number.ToString(specifier, culture).PadLeft(fieldWidth, ' '));
}
}
else if (flag == SprintfFlag.PadZeros)
{
if (number.CompareTo(zero) >= 0)
{
return(number.ToString(specifier, culture).PadLeft(fieldWidth, '0'));
}
else
{
return(culture.NumberFormat.NegativeSign + number.ToString(specifier, culture).Replace(culture.NumberFormat.NegativeSign, "").PadLeft(fieldWidth - 1, '0'));
}
}
else
{
return(number.ToString(specifier, culture).PadLeft(fieldWidth, ' '));
}
}
public static string sprintf(this string value, params object[] args)
{
StringBuilder sb = new StringBuilder();
int chIndex = 0;
int argIndex = 0;
while (chIndex < value.Length)
{
if (value[chIndex] == '%')
{
chIndex++;
SprintfFlag flag = SprintfFlag.None;
if (chIndex < value.Length && value[chIndex] == '+')
{
chIndex++;
flag = SprintfFlag.WriteSign;
}
else if (chIndex < value.Length && value[chIndex] == '#')
{
chIndex++;
flag = SprintfFlag.WritePrefix;
}
else if (chIndex < value.Length && value[chIndex] == '0')
{
chIndex++;
flag = SprintfFlag.PadZeros;
}
int fieldWidth = 0;
while (chIndex < value.Length && char.IsDigit(value[chIndex]))
{
fieldWidth = 10 * fieldWidth + value[chIndex++] - '0';
}
int precision = 0;
if (chIndex < value.Length && value[chIndex] == '.')
{
chIndex++;
while (chIndex < value.Length && char.IsDigit(value[chIndex]))
{
precision = 10 * precision + value[chIndex++] - '0';
}
}
string specifier = "";
if (chIndex < value.Length)
{
switch (value[chIndex])
{
case 'd':
case 'i':
chIndex++;
if (argIndex < args.Length)
{
sb.Append(FormatNumber((long)TjsBinder.ConvertInternal(args[argIndex++], typeof(long)), fieldWidth, flag, "d"));
}
break;
case 'u':
chIndex++;
if (argIndex < args.Length)
{
var uinteger = unchecked ((ulong)(long)TjsBinder.ConvertInternal(args[argIndex++], typeof(long)));
if (flag == SprintfFlag.PadZeros)
{
sb.Append(uinteger.ToString().PadLeft(fieldWidth, '0'));
}
else
{
sb.Append(uinteger.ToString().PadLeft(fieldWidth, ' '));
}
}
break;
case 'o':
chIndex++;
if (argIndex < args.Length)
{
var uinteger = unchecked ((ulong)(long)TjsBinder.ConvertInternal(args[argIndex++], typeof(long)));
if (flag == SprintfFlag.PadZeros)
{
sb.Append(ToOctal(uinteger).PadLeft(fieldWidth, '0'));
}
else if (flag == SprintfFlag.WritePrefix)
{
sb.Append(("0" + ToOctal(uinteger)).PadLeft(fieldWidth, ' '));
}
else
{
sb.Append(ToOctal(uinteger).PadLeft(fieldWidth, ' '));
}
}
break;
case 'x':
case 'X':
if (argIndex < args.Length)
{
var uinteger = unchecked ((ulong)(long)TjsBinder.ConvertInternal(args[argIndex++], typeof(long)));
if (flag == SprintfFlag.PadZeros)
{
sb.Append(uinteger.ToString(value[chIndex].ToString()).PadLeft(fieldWidth, '0'));
}
else if (flag == SprintfFlag.WritePrefix)
{
sb.Append(("0x" + uinteger.ToString(value[chIndex].ToString())).PadLeft(fieldWidth, ' '));
}
else
{
sb.Append(uinteger.ToString(value[chIndex].ToString()).PadLeft(fieldWidth, ' '));
}
}
chIndex++;
break;
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
specifier = value[chIndex++].ToString() + precision.ToString();
if (argIndex < args.Length)
{
sb.Append(FormatNumber((double)TjsBinder.ConvertInternal(args[argIndex++], typeof(double)), fieldWidth, flag, specifier));
}
break;
case 'c':
chIndex++;
if (argIndex < args.Length)
{
sb.Append(args[argIndex++].ToString().charAt(0).PadLeft(fieldWidth, ' '));
}
break;
case 's':
chIndex++;
if (argIndex < args.Length)
{
sb.Append(args[argIndex++].ToString().PadLeft(fieldWidth, ' '));
}
break;
case '%':
sb.Append(value[chIndex++]);
break;
}
}
}
else
{
sb.Append(value[chIndex++]);
}
}
return(sb.ToString());
}
