00001 /******************************************************************************* 00002 00003 @file TextLayout.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, March 2004 00034 @author Kris 00035 Anders F Bjorklund (Darwin patches) 00036 00037 00038 *******************************************************************************/ 00039 00040 module mango.io.TextLayout; 00041 00042 /******************************************************************************* 00043 00044 Arranges text strings in order, using indices to specify where 00045 each particular argument should be positioned within the text. 00046 This is handy for collating I18N components. 00047 00048 @code 00049 // write ordered text to Stdout 00050 char[64] dst; 00051 00052 Stdout (TextLayout (dst, "%2 %1", "one", "two")); 00053 @endcode 00054 00055 The index numbers range from one through nine. TextLayout defaults 00056 to char[], but you can instantiate the template for any other type. 00057 00058 *******************************************************************************/ 00059 00060 struct TextLayoutTemplate(T) 00061 { 00062 /********************************************************************** 00063 00064 **********************************************************************/ 00065 00066 static T[] opCall (T[] output, T[][] layout ...) 00067 { 00068 int pos, 00069 args; 00070 bool state; 00071 00072 args = layout.length - 1; 00073 foreach (T c; layout[0]) 00074 { 00075 if (state) 00076 { 00077 state = false; 00078 if (c >= '1' || c <= '9') 00079 { 00080 uint index = c - '0'; 00081 if (index <= args) 00082 { 00083 T[] x = layout[index]; 00084 00085 int limit = pos + x.length; 00086 if (limit < output.length) 00087 { 00088 output[pos..limit] = x; 00089 pos = limit; 00090 continue; 00091 } 00092 else 00093 error ("TextLayout : output buffer too small"); 00094 } 00095 else 00096 error ("TextLayout : invalid argument"); 00097 } 00098 } 00099 else 00100 if (c == '%') 00101 { 00102 state = true; 00103 continue; 00104 } 00105 00106 if (pos < output.length) 00107 { 00108 output[pos] = c; 00109 ++pos; 00110 } 00111 else 00112 error ("TextLayout : output buffer too small"); 00113 } 00114 00115 return output [0..pos]; 00116 } 00117 00118 /********************************************************************** 00119 00120 **********************************************************************/ 00121 00122 private static void error (char[] msg) 00123 { 00124 throw new Exception (msg); 00125 } 00126 } 00127 00128 00129 alias TextLayoutTemplate!(char) TextLayout; 00130