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 00036 00037 *******************************************************************************/ 00038 00039 module mango.io.TextLayout; 00040 00041 private import mango.io.Exception; 00042 00043 /******************************************************************************* 00044 00045 Arranges text strings in order, using indices to specify where 00046 each particular argument should be positioned within the text. 00047 This is handy for collating I18N components. 00048 00049 @code 00050 // create a TextLayout instance 00051 TextLayout tl = new TextLayout (256); 00052 00053 // write text to Stdout 00054 char[] arg1 = "one"; 00055 char[] arg2 = "two"; 00056 Stdout << tl.format ("%2 %1", arg1, arg2) << Stdout.newline; 00057 00058 // or access the content, post processing ... 00059 char[] text = tl.content; 00060 @endcode 00061 00062 The index numbers range from one through nine. Note also that 00063 this class is stateful, and is therefore not shareable across 00064 multiple threads. 00065 00066 *******************************************************************************/ 00067 00068 class TextLayout (Type) 00069 { 00070 private int count; 00071 private Type[] output; 00072 00073 /*********************************************************************** 00074 00075 Set the maximum buffer length 00076 00077 ***********************************************************************/ 00078 00079 this (int limit) 00080 { 00081 output = new Type [limit]; 00082 } 00083 00084 /*********************************************************************** 00085 00086 Address formatted output as a char[] 00087 00088 ***********************************************************************/ 00089 00090 Type[] content () 00091 { 00092 return output [0..count]; 00093 } 00094 00095 /*********************************************************************** 00096 00097 layout a set of arguments 00098 00099 ***********************************************************************/ 00100 00101 Type[] format (Type[] layout, ...) 00102 { 00103 return format (layout, _arguments, _argptr); 00104 } 00105 00106 /*********************************************************************** 00107 00108 layout a set of arguments 00109 00110 ***********************************************************************/ 00111 00112 private Type[] format (Type[] layout, TypeInfo[] arguments, void *argptr) 00113 { 00114 int pos, 00115 args; 00116 bool state; 00117 00118 args = arguments.length; 00119 foreach (Type c; layout) 00120 { 00121 if (state) 00122 { 00123 state = false; 00124 if (c >= '1' || c <= '9') 00125 { 00126 uint index = c - '1'; 00127 if (index < args && arguments[index] == typeid(Type[])) 00128 { 00129 Type[] x = *cast(Type[] *) (index + cast(void[] *) argptr); 00130 00131 int limit = pos + x.length; 00132 if (limit < output.length) 00133 { 00134 output[pos..limit] = x; 00135 pos = limit; 00136 continue; 00137 } 00138 else 00139 throw new Exception ("TextLayout limit exceeded"); 00140 } 00141 else 00142 throw new Exception ("invalid layout argument"); 00143 } 00144 } 00145 else 00146 if (c == '%') 00147 { 00148 state = true; 00149 continue; 00150 } 00151 00152 if (pos < output.length) 00153 { 00154 output[pos] = c; 00155 ++pos; 00156 } 00157 else 00158 throw new Exception ("layout buffer too small"); 00159 } 00160 00161 count = pos; 00162 return content; 00163 } 00164 }