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