libs-base/Source/NSNumberFormatter.m

/**
   NSNumberFormatter class
   Copyright (C) 2000 Free Software Foundation, Inc.

   Written by: Fred Kiefer <FredKiefer@gmx.de>
   Created: July 2000
   Updated by: Richard Frith-Macdonald <rfm@gnu.org> Sept 2001

   This file is part of the GNUstep Base Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02111 USA.

   <title>NSNumberFormatter class reference</title>
   $Date$ $Revision$
   */

#import "common.h"
#define	EXPOSE_NSNumberFormatter_IVARS	1
#import "Foundation/NSAttributedString.h"
#import "Foundation/NSDecimalNumber.h"
#import "Foundation/NSDictionary.h"
#import "Foundation/NSException.h"
#import "Foundation/NSNumberFormatter.h"
#import "Foundation/NSUserDefaults.h"
#import "Foundation/NSCharacterSet.h"

#import "GNUstepBase/GSLocale.h"

@implementation NSNumberFormatter

- (BOOL) allowsFloats
{
  return _allowsFloats;
}

- (NSAttributedString*) attributedStringForObjectValue: (id)anObject
				 withDefaultAttributes: (NSDictionary*)attr
{
  NSDecimalNumber *zeroNumber = [NSDecimalNumber zero];
  NSDecimalNumber *nanNumber = [NSDecimalNumber notANumber];

  if (anObject == nil)
    {
      return [self attributedStringForNil];
    }
  else if (![anObject isKindOfClass: [NSNumber class]])
    {
      return [self attributedStringForNotANumber];
    }
  else if ([anObject isEqual: nanNumber])
    {
      return [self attributedStringForNotANumber];
    }
  else if ([anObject isEqual: zeroNumber])
    {
      return [self attributedStringForZero];
    }

  if (([(NSNumber*)anObject compare: zeroNumber] == NSOrderedDescending)
    && (_attributesForPositiveValues))
    {
      attr = _attributesForPositiveValues;
    }
  else if (([(NSNumber*)anObject compare: zeroNumber] == NSOrderedAscending)
    && (_attributesForNegativeValues))
    {
      attr = _attributesForNegativeValues;
    }

  return AUTORELEASE([[NSAttributedString alloc] initWithString:
    [self stringForObjectValue: anObject] attributes: attr]);
}

- (NSAttributedString*) attributedStringForNil
{
  return _attributedStringForNil;
}

- (NSAttributedString*) attributedStringForNotANumber
{
  return _attributedStringForNotANumber;
}

- (NSAttributedString*) attributedStringForZero
{
  return _attributedStringForZero;
}

- (id) copyWithZone: (NSZone *)zone
{
  NSNumberFormatter	*c = (NSNumberFormatter*) NSCopyObject(self, 0, zone);

  IF_NO_GC(RETAIN(c->_negativeFormat);)
  IF_NO_GC(RETAIN(c->_positiveFormat);)
  IF_NO_GC(RETAIN(c->_attributesForPositiveValues);)
  IF_NO_GC(RETAIN(c->_attributesForNegativeValues);)
  IF_NO_GC(RETAIN(c->_maximum);)
  IF_NO_GC(RETAIN(c->_minimum);)
  IF_NO_GC(RETAIN(c->_roundingBehavior);)
  IF_NO_GC(RETAIN(c->_roundingBehavior);)
  IF_NO_GC(RETAIN(c->_attributedStringForNil);)
  IF_NO_GC(RETAIN(c->_attributedStringForNotANumber);)
  IF_NO_GC(RETAIN(c->_attributedStringForZero);)

  return c;
}

- (void) dealloc
{
  RELEASE(_negativeFormat);
  RELEASE(_positiveFormat);
  RELEASE(_attributesForPositiveValues);
  RELEASE(_attributesForNegativeValues);
  RELEASE(_maximum);
  RELEASE(_minimum);
  RELEASE(_roundingBehavior);
  RELEASE(_roundingBehavior);
  RELEASE(_attributedStringForNil);
  RELEASE(_attributedStringForNotANumber);
  RELEASE(_attributedStringForZero);
  [super dealloc];
}

- (NSString*) decimalSeparator
{
  if (_decimalSeparator == 0)
    return @"";
  else
    return [NSString stringWithCharacters: &_decimalSeparator length: 1];
}

- (NSString*) editingStringForObjectValue: (id)anObject
{
  return [self stringForObjectValue: anObject];
}

- (void) encodeWithCoder: (NSCoder*)encoder
{
  [encoder encodeValueOfObjCType: @encode(BOOL) at: &_hasThousandSeparators];
  [encoder encodeValueOfObjCType: @encode(BOOL) at: &_allowsFloats];
  [encoder encodeValueOfObjCType: @encode(BOOL) at: &_localizesFormat];
  [encoder encodeValueOfObjCType: @encode(unichar) at: &_thousandSeparator];
  [encoder encodeValueOfObjCType: @encode(unichar) at: &_decimalSeparator];

  [encoder encodeObject: _roundingBehavior];
  [encoder encodeObject: _maximum];
  [encoder encodeObject: _minimum];
  [encoder encodeObject: _attributedStringForNil];
  [encoder encodeObject: _attributedStringForNotANumber];
  [encoder encodeObject: _attributedStringForZero];
  [encoder encodeObject: _negativeFormat];
  [encoder encodeObject: _positiveFormat];
  [encoder encodeObject: _attributesForPositiveValues];
  [encoder encodeObject: _attributesForNegativeValues];
}

- (NSString*) format
{
  if (_attributedStringForZero != nil)
    {
      return [NSString stringWithFormat: @"%@;%@;%@",
	_positiveFormat, [_attributedStringForZero string], _negativeFormat];
    }
  else
    {
      return [NSString stringWithFormat: @"%@;%@",
	_positiveFormat, _negativeFormat];
    }
}

- (BOOL) getObjectValue: (id*)anObject
	      forString: (NSString*)string
       errorDescription: (NSString**)error
{
  /* FIXME: This is just a quick hack implementation.  */
  NSLog(@"NSNumberFormatter-getObjectValue:forString:... not fully implemented");

  /* Just assume nothing else has been setup and do a simple conversion. */
  if ([self hasThousandSeparators])
    {
      NSRange range;
      
      range = [string rangeOfString: [self thousandSeparator]];
      if (range.length != 0)
        {
	  string = AUTORELEASE([string mutableCopy]);
	  [(NSMutableString*)string replaceOccurrencesOfString:
	    [self thousandSeparator]
	    withString: @""
	    options: 0
	    range: NSMakeRange(0, [string length])];
	}
    }

  if (anObject)
    {
      NSDictionary *locale;
      
      locale = [NSDictionary dictionaryWithObject: [self decimalSeparator] 
			     forKey: NSDecimalSeparator];
      *anObject = [NSDecimalNumber decimalNumberWithString: string
				   locale: locale];
      if (*anObject)
        {
	  return YES;
	}
    }

  return NO;
}

- (BOOL) hasThousandSeparators
{
  return _hasThousandSeparators;
}

- (id) init
{
  id	o;

  _allowsFloats = YES;
  _decimalSeparator = '.';
  _thousandSeparator = ',';
  _hasThousandSeparators = YES;
  o = [[NSAttributedString alloc] initWithString: @""];
  [self setAttributedStringForNil: o];
  RELEASE(o);
  o = [[NSAttributedString alloc] initWithString: @"NaN"];
  [self setAttributedStringForNotANumber: o];
  RELEASE(o);

  return self;
}

- (id) initWithCoder: (NSCoder*)decoder
{
  if ([decoder allowsKeyedCoding])
    {
      if ([decoder containsValueForKey: @"NS.allowsfloats"])
        {
	  [self setAllowsFloats:
	    [decoder decodeBoolForKey: @"NS.allowsfloats"]];
	}
      if ([decoder containsValueForKey: @"NS.decimal"])
        {
	  [self setDecimalSeparator:
	    [decoder decodeObjectForKey: @"NS.decimal"]];
	}
      if ([decoder containsValueForKey: @"NS.hasthousands"])
        {
	  [self setHasThousandSeparators:
	    [decoder decodeBoolForKey: @"NS.hasthousands"]];
	}
      if ([decoder containsValueForKey: @"NS.localized"])
        {
	  [self setLocalizesFormat:
	    [decoder decodeBoolForKey: @"NS.localized"]];
	}
      if ([decoder containsValueForKey: @"NS.max"])
        {
	  [self setMaximum: [decoder decodeObjectForKey: @"NS.max"]];
	}
      if ([decoder containsValueForKey: @"NS.min"])
        {
	  [self setMinimum: [decoder decodeObjectForKey: @"NS.min"]];
	}
      if ([decoder containsValueForKey: @"NS.nan"])
        {
	  [self setAttributedStringForNotANumber:
	    [decoder decodeObjectForKey: @"NS.nan"]];
	}
      if ([decoder containsValueForKey: @"NS.negativeattrs"])
        {
	  [self setTextAttributesForNegativeValues:
	    [decoder decodeObjectForKey: @"NS.negativeattrs"]];
	}
      if ([decoder containsValueForKey: @"NS.negativeformat"])
        {
	  [self setNegativeFormat:
	    [decoder decodeObjectForKey: @"NS.negativeformat"]];
	}
      if ([decoder containsValueForKey: @"NS.nil"])
        {
	  [self setAttributedStringForNil:
	    [decoder decodeObjectForKey: @"NS.nil"]];
	}
      if ([decoder containsValueForKey: @"NS.positiveattrs"])
        {
	  [self setTextAttributesForPositiveValues:
	    [decoder decodeObjectForKey: @"NS.positiveattrs"]];
	}
      if ([decoder containsValueForKey: @"NS.positiveformat"])
        {
	  [self setPositiveFormat:
	    [decoder decodeObjectForKey: @"NS.positiveformat"]];
	}
      if ([decoder containsValueForKey: @"NS.rounding"])
        {
	  [self setRoundingBehavior:
	    [decoder decodeObjectForKey: @"NS.rounding"]];
	}
      if ([decoder containsValueForKey: @"NS.thousand"])
        {
	  [self setThousandSeparator:
	    [decoder decodeObjectForKey: @"NS.thousand"]];
	}
      if ([decoder containsValueForKey: @"NS.zero"])
        {
	  [self setAttributedStringForZero:
	    [decoder decodeObjectForKey: @"NS.zero"]];
	}
    }
  else
    {
      [decoder decodeValueOfObjCType: @encode(BOOL)
				  at: &_hasThousandSeparators];
      [decoder decodeValueOfObjCType: @encode(BOOL) at: &_allowsFloats];
      [decoder decodeValueOfObjCType: @encode(BOOL) at: &_localizesFormat];
      [decoder decodeValueOfObjCType: @encode(unichar) at: &_thousandSeparator];
      [decoder decodeValueOfObjCType: @encode(unichar) at: &_decimalSeparator];

      [decoder decodeValueOfObjCType: @encode(id) at: &_roundingBehavior];
      [decoder decodeValueOfObjCType: @encode(id) at: &_maximum];
      [decoder decodeValueOfObjCType: @encode(id) at: &_minimum];
      [decoder decodeValueOfObjCType: @encode(id) at: &_attributedStringForNil];
      [decoder decodeValueOfObjCType: @encode(id)
	                          at: &_attributedStringForNotANumber];
      [decoder decodeValueOfObjCType: @encode(id)
				  at: &_attributedStringForZero];
      [decoder decodeValueOfObjCType: @encode(id) at: &_negativeFormat];
      [decoder decodeValueOfObjCType: @encode(id) at: &_positiveFormat];
      [decoder decodeValueOfObjCType: @encode(id)
	                          at: &_attributesForPositiveValues];
      [decoder decodeValueOfObjCType: @encode(id)
	                          at: &_attributesForNegativeValues];
    }
  return self;
}

- (BOOL) isPartialStringValid: (NSString*)partialString
	     newEditingString: (NSString**)newString
	     errorDescription: (NSString**)error
{
  // FIXME
  if (newString != NULL)
    {
      *newString = partialString;
    }
  if (error)
    {
      *error = nil;
    }

  return YES;
}

- (BOOL) localizesFormat
{
  return _localizesFormat;
}

- (NSDecimalNumber*) maximum
{
  return _maximum;
}

- (NSDecimalNumber*) minimum
{
  return _minimum;
}

- (NSString*) negativeFormat
{
  return _negativeFormat;
}

- (NSString*) positiveFormat
{
  return _positiveFormat;
}

- (NSDecimalNumberHandler*) roundingBehavior
{
  return _roundingBehavior;
}

- (void) setAllowsFloats: (BOOL)flag
{
  _allowsFloats = flag;
}

- (void) setAttributedStringForNil: (NSAttributedString*)newAttributedString
{
  ASSIGN(_attributedStringForNil, newAttributedString);
}

- (void) setAttributedStringForNotANumber:
  (NSAttributedString*)newAttributedString
{
  ASSIGN(_attributedStringForNotANumber, newAttributedString);
}

- (void) setAttributedStringForZero: (NSAttributedString*)newAttributedString
{
  ASSIGN(_attributedStringForZero, newAttributedString);
}

- (void) setDecimalSeparator: (NSString*)newSeparator
{
  if ([newSeparator length] > 0)
    _decimalSeparator = [newSeparator characterAtIndex: 0];
  else
    _decimalSeparator = 0;
}

- (void) setFormat: (NSString*)aFormat
{
  NSRange	r;

  r = [aFormat rangeOfString: @";"];
  if (r.length == 0)
    {
      [self setPositiveFormat: aFormat];
      [self setNegativeFormat: [@"-" stringByAppendingString: aFormat]];
    }
  else
    {
      [self setPositiveFormat: [aFormat substringToIndex: r.location]];
      aFormat = [aFormat substringFromIndex: NSMaxRange(r)];
      r = [aFormat rangeOfString: @";"];
      if (r.length == 0)
	{
	  [self setNegativeFormat: aFormat];
	}
      else
	{
	  RELEASE(_attributedStringForZero);
	  _attributedStringForZero = [[NSAttributedString alloc] initWithString:
	    [aFormat substringToIndex: r.location]];
	  [self setNegativeFormat: [aFormat substringFromIndex: NSMaxRange(r)]];
	}
    }
}

- (void) setHasThousandSeparators: (BOOL)flag
{
  _hasThousandSeparators = flag;
}

- (void) setLocalizesFormat: (BOOL)flag
{
  _localizesFormat = flag;
}

- (void) setMaximum: (NSDecimalNumber*)aMaximum
{
  ASSIGN(_maximum, aMaximum);
}

- (void) setMinimum: (NSDecimalNumber*)aMinimum
{
  ASSIGN(_minimum, aMinimum);
}

- (void) setNegativeFormat: (NSString*)aFormat
{
  // FIXME: Should extract separators and attributes
  ASSIGN(_negativeFormat, aFormat);
}

- (void) setPositiveFormat: (NSString*)aFormat
{
  // FIXME: Should extract separators and attributes
  ASSIGN(_positiveFormat, aFormat);
}

- (void) setRoundingBehavior: (NSDecimalNumberHandler*)newRoundingBehavior
{
  ASSIGN(_roundingBehavior, newRoundingBehavior);
}

- (void) setTextAttributesForNegativeValues: (NSDictionary*)newAttributes
{
  ASSIGN(_attributesForNegativeValues, newAttributes);
}

- (void) setTextAttributesForPositiveValues: (NSDictionary*)newAttributes
{
  ASSIGN(_attributesForPositiveValues, newAttributes);
}

- (void) setThousandSeparator: (NSString*)newSeparator
{
  if ([newSeparator length] > 0)
    _thousandSeparator = [newSeparator characterAtIndex: 0];
  else
    _thousandSeparator = 0;
}

- (NSString*) stringForObjectValue: (id)anObject
{
  NSMutableDictionary	*locale;
  NSCharacterSet	*formattingCharacters;
  NSCharacterSet	*placeHolders;
  NSString		*prefix;
  NSString		*suffix;
  NSString		*wholeString;
  NSString		*fracPad = nil;
  NSString		*fracPartString;
  NSMutableString	*intPartString;
  NSMutableString	*formattedNumber;
  NSMutableString	*intPad;
  NSRange		prefixRange;
  NSRange		decimalPlaceRange;
  NSRange		suffixRange;
  NSRange		intPartRange;
  NSDecimal		representativeDecimal;
  NSDecimal		roundedDecimal;
  NSDecimalNumber	*roundedNumber;
  NSDecimalNumber	*intPart;
  NSDecimalNumber	*fracPart;
  int			decimalPlaces = 0;
  BOOL			displayThousandsSeparators = NO;
  BOOL			displayFractionalPart = NO;
  BOOL			negativeNumber = NO;
  NSString		*useFormat;
  NSString		*defaultDecimalSeparator = nil;
  NSString		*defaultThousandsSeparator = nil;

  if (_localizesFormat)
    {
      NSDictionary *defaultLocale = GSDomainFromDefaultLocale();
      defaultDecimalSeparator 
	= [defaultLocale objectForKey: NSDecimalSeparator];
      defaultThousandsSeparator 
	= [defaultLocale objectForKey: NSThousandsSeparator];
    }

  if (defaultDecimalSeparator == nil)
    {
      defaultDecimalSeparator = @".";
    }
  if (defaultThousandsSeparator == nil)
    {
      defaultThousandsSeparator = @",";
    }
  formattingCharacters = [NSCharacterSet
    characterSetWithCharactersInString: @"0123456789#.,_"];
  placeHolders = [NSCharacterSet 
    characterSetWithCharactersInString: @"0123456789#_"];

  if (nil == anObject)
    return [[self attributedStringForNil] string];
  if (![anObject isKindOfClass: [NSNumber class]])
    return [[self attributedStringForNotANumber] string];
  if ([anObject isEqual: [NSDecimalNumber notANumber]])
    return [[self attributedStringForNotANumber] string];
  if (_attributedStringForZero
      && [anObject isEqual: [NSDecimalNumber zero]])
    return [[self attributedStringForZero] string];
  
  useFormat = _positiveFormat;
  if ([(NSNumber*)anObject compare: [NSDecimalNumber zero]]
    == NSOrderedAscending)
    {
      useFormat = _negativeFormat;
      negativeNumber = YES;
    }

  // if no format specified, use the same default that Cocoa does
  if (nil == useFormat)
    {
      useFormat = [NSString stringWithFormat: @"%@#%@###%@##",
			    negativeNumber ? @"-" : @"",
			    defaultThousandsSeparator,
			    defaultDecimalSeparator];
    }

  prefixRange = [useFormat rangeOfCharacterFromSet: formattingCharacters];
  if (NSNotFound != prefixRange.location)
    {
      prefix = [useFormat substringToIndex: prefixRange.location];
    }
  else
    {
      prefix = @"";
    }

  locale = [NSMutableDictionary dictionaryWithCapacity: 3];
  [locale setObject: @"" forKey: NSThousandsSeparator];
  [locale setObject: @"" forKey: NSDecimalSeparator];

  //should also set NSDecimalDigits?
  
  if ([self hasThousandSeparators]
    && (0 != [useFormat rangeOfString: defaultThousandsSeparator].length))
    {
      displayThousandsSeparators = YES;
    }

  if ([self allowsFloats]
    && (NSNotFound 
	!= [useFormat rangeOfString: defaultDecimalSeparator].location))
    {
      decimalPlaceRange = [useFormat rangeOfString: defaultDecimalSeparator
					   options: NSBackwardsSearch];
      if (NSMaxRange(decimalPlaceRange) == [useFormat length])
        {
          decimalPlaces = 0;
        }
      else
        {
          while ([placeHolders characterIsMember:
	    [useFormat characterAtIndex: NSMaxRange(decimalPlaceRange)]])
            {
              decimalPlaceRange.length++;
              if (NSMaxRange(decimalPlaceRange) == [useFormat length])
                break;
            }
          decimalPlaces=decimalPlaceRange.length -= 1;
          decimalPlaceRange.location += 1;
          fracPad = [useFormat substringWithRange:decimalPlaceRange];
        } 
      if (0 != decimalPlaces)
        displayFractionalPart = YES;
    }

  representativeDecimal = [anObject decimalValue];
  NSDecimalRound(&roundedDecimal, &representativeDecimal, decimalPlaces,
    NSRoundPlain);
  roundedNumber = [NSDecimalNumber decimalNumberWithDecimal: roundedDecimal];

  /* Arguably this fiddling could be done by GSDecimalString() but I
   * thought better to leave that behaviour as it is and provide the
   * desired prettification here
   */
  if (negativeNumber)
    roundedNumber = [roundedNumber decimalNumberByMultiplyingBy:
      (NSDecimalNumber*)[NSDecimalNumber numberWithInt: -1]];
  intPart = (NSDecimalNumber*)
    [NSDecimalNumber numberWithInt: (int)[roundedNumber doubleValue]];
  fracPart = [roundedNumber decimalNumberBySubtracting: intPart];
  intPartString
    = AUTORELEASE([[intPart descriptionWithLocale: locale] mutableCopy]);
  
  //sort out the padding for the integer part
  intPartRange = [useFormat rangeOfCharacterFromSet: placeHolders];
  if (NSMaxRange(intPartRange) < ([useFormat length] - 1))
    {
      while (([placeHolders characterIsMember:
        [useFormat characterAtIndex: NSMaxRange(intPartRange)]]
        || [[useFormat substringFromRange:
          NSMakeRange(NSMaxRange(intPartRange), 1)] isEqual:
	    defaultThousandsSeparator])
        && NSMaxRange(intPartRange) < [useFormat length] - 1)
        {
          intPartRange.length++;
        }
    }
  intPad = [[useFormat substringWithRange: intPartRange] mutableCopy];
  [intPad replaceOccurrencesOfString: defaultThousandsSeparator
    withString: @""
    options: 0
    range: NSMakeRange(0, [intPad length])];
  [intPad replaceOccurrencesOfString: @"#"
    withString: @""
    options: NSAnchoredSearch
    range: NSMakeRange(0, [intPad length])];
  if ([intPad length] > [intPartString length])
    {
      NSRange		ipRange;

      ipRange = NSMakeRange(0, [intPad length] - [intPartString length] + 1);
      [intPartString insertString:
        [intPad substringWithRange: ipRange] atIndex: 0];
      [intPartString replaceOccurrencesOfString: @"_"
	withString: @" "
	options: 0
	range: NSMakeRange(0, [intPartString length])];
      [intPartString replaceOccurrencesOfString: @"#"
	withString: @"0"
	options: 0
	range: NSMakeRange(0, [intPartString length])];
    }
  // fix the thousands separators up
  if (displayThousandsSeparators && [intPartString length] > 3)
    {
      int index = [intPartString length];

      while (0 < (index -= 3))
	{
	  [intPartString insertString: [self thousandSeparator] atIndex: index];
	}
    }

  formattedNumber = [intPartString mutableCopy];

  //fix up the fractional part
  if (displayFractionalPart)
    {
      if (0 != decimalPlaces)
        {
	  NSMutableString	*ms;

          fracPart = [fracPart decimalNumberByMultiplyingByPowerOf10:
	    decimalPlaces];
          ms = [[fracPart descriptionWithLocale: locale] mutableCopy];
          [ms replaceOccurrencesOfString: @"0"
	    withString: @""
	    options: (NSBackwardsSearch | NSAnchoredSearch)
	    range: NSMakeRange(0, [ms length])];
          if ([fracPad length] > [ms length])
            {
              NSRange fpRange;

              fpRange = NSMakeRange([ms length],
	        ([fracPad length] - [ms length]));
              [ms appendString:
		[fracPad substringWithRange: fpRange]];
              [ms replaceOccurrencesOfString: @"#"
		withString: @""
		options: (NSBackwardsSearch | NSAnchoredSearch)
		range: NSMakeRange(0, [ms length])];
              [ms replaceOccurrencesOfString: @"#"
		withString: @"0"
		options: 0
		range: NSMakeRange(0, [ms length])];
              [ms replaceOccurrencesOfString: @"_"
		withString: @" "
		options: 0
		range: NSMakeRange(0, [ms length])];
            }
	  fracPartString = AUTORELEASE(ms);
        }
      else
        {
          fracPartString = @"0";
        }
      [formattedNumber appendString: [self decimalSeparator]];
      [formattedNumber appendString: fracPartString];
    }
  /*FIXME - the suffix doesn't behave the same as on Mac OS X.
   * Our suffix is everything which follows the final formatting
   * character.  Cocoa's suffix is everything which isn't a
   * formatting character nor in the prefix
   */
  suffixRange = [useFormat rangeOfCharacterFromSet: formattingCharacters
    options: NSBackwardsSearch];
  suffix = [useFormat substringFromIndex: NSMaxRange(suffixRange)];
  wholeString = [[prefix stringByAppendingString: formattedNumber]
    stringByAppendingString: suffix];
  [formattedNumber release];
  return wholeString;
}

- (NSDictionary*) textAttributesForNegativeValues
{
  return _attributesForNegativeValues;
}

- (NSDictionary*) textAttributesForPositiveValues
{
  return _attributesForPositiveValues;
}

- (NSString*) thousandSeparator
{
  if (!_thousandSeparator)
    return @"";
  else
    return [NSString stringWithCharacters: &_thousandSeparator length: 1];
}

- (NSString *) stringFromNumber: (NSNumber *)number
{
  return [self stringForObjectValue: number];
}

- (NSNumber *) numberFromString: (NSString *)string
{
  id number = nil;
  NSString *error;

  [self getObjectValue: &number
	forString: string
	errorDescription: &error];

  return number;
}
@end