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Number.d

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00001 /*******************************************************************************
00002 
00003         @file Number.d
00004         
00005         Copyright (c) 2004 Kris Bell
00006         
00007         This software is provided 'as-is', without any express or implied
00008         warranty. In no event will the authors be held liable for damages
00009         of any kind arising from the use of this software.
00010         
00011         Permission is hereby granted to anyone to use this software for any 
00012         purpose, including commercial applications, and to alter it and/or 
00013         redistribute it freely, subject to the following restrictions:
00014         
00015         1. The origin of this software must not be misrepresented; you must 
00016            not claim that you wrote the original software. If you use this 
00017            software in a product, an acknowledgment within documentation of 
00018            said product would be appreciated but is not required.
00019 
00020         2. Altered source versions must be plainly marked as such, and must 
00021            not be misrepresented as being the original software.
00022 
00023         3. This notice may not be removed or altered from any distribution
00024            of the source.
00025 
00026         4. Derivative works are permitted, but they must carry this notice
00027            in full and credit the original source.
00028 
00029 
00030                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
00031 
00032         
00033         @version        Initial version, Feb 2005
00034         @author         Kris
00035 
00036 
00037 *******************************************************************************/
00038 
00039 module mango.format.Number;
00040 
00041 private import  mango.io.Exception;
00042 
00043 private import  mango.format.Formatter;
00044 
00045 /******************************************************************************
00046 
00047 ******************************************************************************/
00048 
00049 class Number : Formatter
00050 {
00051         enum Radix {Binary=2, Octal=8, Decimal=10, Hexadecimal=16};
00052 
00053         /***********************************************************************
00054         
00055                 Setup a static error instance
00056 
00057         ***********************************************************************/
00058 
00059         private static IOException error;
00060 
00061         static this ()
00062         {
00063                 error = new IOException ("formatting buffer too small");
00064         }
00065 
00066         /**********************************************************************
00067 
00068         **********************************************************************/
00069 
00070         package static uint trim (tChar[] digits, inout bool sign, Radix* radix=null)
00071         {
00072                 tChar  c;
00073                 tChar* p = digits;
00074                 int    len = digits.length;
00075 
00076                 for (c = *p; len; c = *++p, --len)
00077                      if (c == ' ' || c == '\t')
00078                         {}
00079                      else
00080                         if (c == '-')
00081                             sign = true;
00082                         else
00083                            if (c == '+')
00084                                sign = false;
00085                            else
00086                               break;
00087 
00088                 // strip off a radix specifier also?
00089                 if (radix && *radix == 0)
00090                     if (c == '0' && len)
00091                         switch (*++p)
00092                                {
00093                                case 'x':
00094                                case 'X':
00095                                     *radix = Radix.Hexadecimal;
00096                                     ++p;
00097                                     break;
00098 
00099                                case 'b':
00100                                case 'B':
00101                                     *radix = Radix.Binary;
00102                                     ++p;
00103                                     break;
00104 
00105                                default:
00106                                     *radix = Radix.Octal;
00107                                } 
00108                     else
00109                        *radix = Radix.Decimal;
00110 
00111                 return p - digits.ptr;
00112         }
00113 }
00114 
00115 

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