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//
// System.DecimalFormatter.cs
//
// Author:
// Martin Weindel (martin.weindel@t-online.de)
//
// (C) Martin Weindel, Derek Holden dholden@draper.com
//
//
// Internal class for formatting decimal numbers.
using System.Globalization;
using System.Text;
using S = System; // only used for switching test implementation
namespace System
{
internal sealed class DecimalFormatter
{
private static bool ParseFormat (string format, out char specifier, out int precision)
{
precision = -1;
specifier = '\0';
int length = format.Length;
if (length < 1 || length > 3)
return false;
char[] chars = format.ToCharArray ();
specifier = Char.ToUpper(chars[0]);
if (length == 1)
return true;
if (length == 2)
{
if (chars[1] < '0' || chars[1] > '9')
return false;
precision = chars[1] - '0';
}
else
{
if (chars[1] < '0' || chars[2] < '0' || chars[1] > '9' || chars[2] > '9')
return false;
precision = (chars[1] - '0') * 10 + (chars[2] - '0');
}
return true;
}
public static string NumberToString(string format, NumberFormatInfo nfi, S.Decimal value)
{
char specifier;
int precision;
if (!DecimalFormatter.ParseFormat(format, out specifier, out precision))
{
throw new FormatException (Locale.GetText ("The specified format is invalid"));
}
int digits = -1;
int decimals = 0;
// first calculate number of digits or decimals needed for format
switch (specifier)
{
case 'C':
decimals = (precision >= 0) ? precision : nfi.CurrencyDecimalDigits;
break;
case 'F': goto case 'N';
case 'N':
decimals = (precision >= 0) ? precision : nfi.NumberDecimalDigits;
break;
case 'G':
digits = (precision >= 0) ? precision : 0;
break;
case 'E':
digits = (precision >= 0) ? precision+1 : 7;
break;
case 'P':
decimals = (precision >= 0) ? precision+2 : nfi.PercentDecimalDigits+2;
break;
case 'Z':
digits = 0;
break;
}
// get digit string
const int bufSize = 40;
int decPos = 0, sign = 0;
#if !MSTEST
char[] buf = new char[bufSize];
if (S.Decimal.decimal2string(ref value, digits, decimals, buf, bufSize, out decPos, out sign) != 0)
{
throw new FormatException(); // should never happen
}
StringBuilder sb = new StringBuilder(new String(buf), bufSize);
#else
StringBuilder sb = new StringBuilder(bufSize);
if (S.Decimal.decimal2string(ref value, digits, decimals, sb, bufSize, out decPos, out sign) != 0)
{
throw new FormatException(); // should never happen
}
#endif
// now build the format
switch (specifier)
{
case 'C': return FormatCurrency(nfi, sb, decimals, decPos, sign);
case 'N': return FormatNumber(nfi, sb, decimals, decPos, sign);
case 'F': return FormatFixedPoint(nfi, sb, decimals, decPos, sign);
case 'G': return FormatGeneral(nfi, sb, digits, decPos, sign, format[0]);
case 'E': return FormatExponential(nfi, sb, digits, decPos, sign, format[0], true);
case 'P': return FormatPercent(nfi, sb, decimals, decPos, sign);
case 'Z': return FormatNormalized(nfi, sb, digits, decPos, sign);
default:
throw new FormatException (Locale.GetText ("The specified format is invalid"));
}
}
private static string FormatFixedPoint(NumberFormatInfo nfi, StringBuilder sb,
int decimals, int decPos, int sign)
{
if (decimals > 0)
{
sb.Insert((decPos <= 0) ? 1 : decPos, nfi.NumberDecimalSeparator);
}
if (sign != 0)
{
sb.Insert(0, nfi.NegativeSign);
}
return sb.ToString();
}
private static string FormatExponential(NumberFormatInfo nfi, StringBuilder sb,
int digits, int decPos, int sign, char echar, bool exp3flag)
{
// insert decimal separator
if (digits > 1 || (digits == 0 && sb.Length > 1))
{
sb.Insert(1, nfi.NumberDecimalSeparator);
}
// insert sign
if (sign != 0)
{
sb.Insert(0, nfi.NegativeSign);
}
// append exponent
sb.Append(echar);
decPos--;
sb.Append((decPos >= 0) ? nfi.PositiveSign : nfi.NegativeSign);
if (decPos < 0) decPos *= -1;
if (exp3flag) sb.Append('0');
sb.Append((char)('0' + decPos/10));
sb.Append((char)('0' + decPos%10));
return sb.ToString();
}
private static string FormatGeneral(NumberFormatInfo nfi, StringBuilder sb,
int digits, int decPos, int sign, char gchar)
{
int dig = digits;
bool bFix = (digits == 0 && decPos >= -3) || (digits >= decPos && decPos >= -3 && digits != 0);
// remove trailing digits
while (sb.Length > 1 && (sb.Length > decPos || !bFix) && sb[sb.Length-1] == '0')
{
sb.Remove(sb.Length-1, 1);
if (dig != 0) dig--;
}
if (bFix)
{
while (decPos <= 0)
{
sb.Insert(0, '0');
if (dig != 0 && decPos != 0) dig++;
decPos++;
}
return FormatFixedPoint(nfi, sb, sb.Length - decPos, decPos, sign);
}
else
{
return FormatExponential(nfi, sb, dig, decPos, sign, (char)(gchar-2), false);
}
}
private static string FormatGroupAndDec(StringBuilder sb, int decimals, int decPos,
int[] groupSizes, string groupSeparator, string decSeparator)
{
int offset = 0;
// Groups
if (decPos > 0)
{
if (groupSizes != null)
{
int lastSize = 0;
int digitCount = 0;
for (int i = 0; i < groupSizes.GetLength(0); i++)
{
int size = groupSizes[i];
if (size > 0)
{
digitCount += size;
if (digitCount < decPos)
{
sb.Insert(decPos - digitCount, groupSeparator);
offset += groupSeparator.Length;
}
}
lastSize = size;
}
if (lastSize > 0)
{
while (true)
{
digitCount +=lastSize;
if (digitCount >= decPos) break;
sb.Insert(decPos - digitCount, groupSeparator);
offset += groupSeparator.Length;
}
}
}
}
if (decimals > 0)
{
sb.Insert(offset + ((decPos <= 0) ? 1 : decPos), decSeparator);
}
return sb.ToString();
}
private static string FormatNumber(NumberFormatInfo nfi, StringBuilder sb,
int decimals, int decPos, int sign)
{
string s = FormatGroupAndDec(sb, decimals, decPos,
nfi.NumberGroupSizes, nfi.NumberGroupSeparator, nfi.NumberDecimalSeparator);
// sign
if (sign != 0)
{
switch (nfi.NumberNegativePattern)
{
case 0:
return "(" + s + ")";
case 1:
return nfi.NegativeSign + s;
case 2:
return nfi.NegativeSign + " " + s;
case 3:
return s + nfi.NegativeSign;
case 4:
return s + " " + nfi.NegativeSign;
default:
throw new ArgumentException(Locale.GetText ("Invalid NumberNegativePattern"));
}
}
else
{
return s;
}
}
private static string FormatCurrency(NumberFormatInfo nfi, StringBuilder sb,
int decimals, int decPos, int sign)
{
string s = FormatGroupAndDec(sb, decimals, decPos,
nfi.CurrencyGroupSizes, nfi.CurrencyGroupSeparator, nfi.CurrencyDecimalSeparator);
if (sign != 0)
{ // negative
switch (nfi.CurrencyNegativePattern)
{
case 0:
return "(" + nfi.CurrencySymbol + s + ")";
case 1:
return nfi.NegativeSign + nfi.CurrencySymbol + s;
case 2:
return nfi.CurrencySymbol + nfi.NegativeSign + s;
case 3:
return nfi.CurrencySymbol + s + nfi.NegativeSign;
case 4:
return "(" + s + nfi.CurrencySymbol + ")";
case 5:
return nfi.NegativeSign + s + nfi.CurrencySymbol;
case 6:
return s + nfi.NegativeSign + nfi.CurrencySymbol;
case 7:
return s + nfi.CurrencySymbol + nfi.NegativeSign;
case 8:
return nfi.NegativeSign + s + " " + nfi.CurrencySymbol;
case 9:
return nfi.NegativeSign + nfi.CurrencySymbol + " " + s;
case 10:
return s + " " + nfi.CurrencySymbol + nfi.NegativeSign;
case 11:
return nfi.CurrencySymbol + " " + s + nfi.NegativeSign;
case 12:
return nfi.CurrencySymbol + " " + nfi.NegativeSign + s;
case 13:
return s + nfi.NegativeSign + " " + nfi.CurrencySymbol;
case 14:
return "(" + nfi.CurrencySymbol + " " + s + ")";
case 15:
return "(" + s + " " + nfi.CurrencySymbol + ")";
default:
throw new ArgumentException(Locale.GetText ("Invalid CurrencyNegativePattern"));
}
}
else
{
switch (nfi.CurrencyPositivePattern)
{
case 0:
return nfi.CurrencySymbol + s;
case 1:
return s + nfi.CurrencySymbol;
case 2:
return nfi.CurrencySymbol + " " + s;
case 3:
return s + " " + nfi.CurrencySymbol;
default:
throw new ArgumentException(Locale.GetText ("Invalid CurrencyPositivePattern"));
}
}
}
private static string FormatPercent(NumberFormatInfo nfi, StringBuilder sb,
int decimals, int decPos, int sign)
{
string s = FormatGroupAndDec(sb, decimals, decPos+2,
nfi.PercentGroupSizes, nfi.PercentGroupSeparator, nfi.PercentDecimalSeparator);
if (sign != 0)
{ // negative
switch (nfi.PercentNegativePattern)
{
case 0:
return nfi.NegativeSign + s + " " + nfi.PercentSymbol;
case 1:
return nfi.NegativeSign + s + nfi.PercentSymbol;
case 2:
return nfi.NegativeSign + nfi.PercentSymbol + s;
default:
throw new ArgumentException(Locale.GetText ("Invalid PercentNegativePattern"));
}
}
else
{
switch (nfi.PercentPositivePattern)
{
case 0:
return s + " " + nfi.PercentSymbol;
case 1:
return s + nfi.PercentSymbol;
case 2:
return nfi.PercentSymbol + s;
default:
throw new ArgumentException("Invalid PercentPositivePattern");
}
}
}
[MonoTODO]
private static string FormatNormalized(NumberFormatInfo nfi, StringBuilder sb,
int digits, int decPos, int sign)
{
//LAMESPEC: how should this format look like ? Is this a fixed point format ?
throw new NotImplementedException ();
}
}
}
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