utf8stringeditor.cpp

00001 /***************************************************************************
00002  *   Copyright (C) 2009 by the FIFE team                                   *
00003  *   http://www.fifengine.de                                               *
00004  *   This file is part of FIFE.                                            *
00005  *                                                                         *
00006  *   FIFE is free software; you can redistribute it and/or                 *
00007  *   modify it under the terms of the GNU Lesser General Public            *
00008  *   License as published by the Free Software Foundation; either          *
00009  *   version 2.1 of the License, or (at your option) any later version.    *
00010  *                                                                         *
00011  *   This library is distributed in the hope that it will be useful,       *
00012  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
00013  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
00014  *   Lesser General Public License for more details.                       *
00015  *                                                                         *
00016  *   You should have received a copy of the GNU Lesser General Public      *
00017  *   License along with this library; if not, write to the                 *
00018  *   Free Software Foundation, Inc.,                                       *
00019  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
00020  ***************************************************************************/
00021  
00022 // Standard C++ library includes
00023 #include <iostream>
00024 
00025 // 3rd party library includes
00026 
00027 // FIFE includes
00028 // These includes are split up in two parts, separated by one empty line
00029 // First block: files included from the FIFE root src directory
00030 // Second block: files included from the same folder
00031 #include "utf8stringeditor.h"
00032 #include "utf8.h"
00033 
00034 namespace gcn {
00035 
00036     int UTF8StringEditor::nextChar(const std::string & text, int byteOffset)
00037     {
00038         std::string::const_iterator c, e;
00039 
00040         c = text.begin() + byteOffset;
00041         e = text.end();
00042 
00043         utf8::next(c, e);
00044         return std::string(text.begin(), c).size();
00045     }
00046 
00047     int UTF8StringEditor::prevChar(const std::string & text, int byteOffset)
00048     {
00049         std::string::const_iterator c, b;
00050 
00051         c = text.begin() + byteOffset;
00052         b = text.begin();
00053 
00054         utf8::prior(c, b);
00055         return std::string(b, c).size();
00056     }
00057 
00058     int UTF8StringEditor::eraseChar(std::string & text, int byteOffset)
00059     {
00060         std::string::iterator begin, cur;
00061         begin = text.begin() + byteOffset;
00062         cur = begin;
00063         utf8::next(cur, text.end());
00064 
00065         text = std::string(text.begin(), begin) + std::string(cur, text.end());
00066         return byteOffset; // this shouldn't change!
00067     }
00068 
00069     int UTF8StringEditor::insertChar(std::string & text, int byteOffset, int ch)
00070     {
00071         std::string newText;
00072         std::string::iterator cut;
00073         int newOffset;
00074 
00075         // make a temp string from left part of the caret (+6 extra chars)
00076         newText = text.substr(0, byteOffset) + "        ";
00077         // append character
00078         utf8::append(ch, newText.begin() + byteOffset);
00079         // calculate newText real length
00080         cut = newText.begin() + byteOffset;
00081         utf8::next(cut, newText.end());
00082         // cut the string to real length
00083         newText = std::string(newText.begin(), cut);
00084         newOffset = newText.size();
00085         // make new text
00086         text = newText + text.substr(byteOffset);
00087 
00088         return newOffset;
00089     }
00090 
00091     int UTF8StringEditor::countChars(const std::string & text, int byteOffset)
00092     {
00093         return utf8::distance(text.begin(), text.begin() + byteOffset);
00094     }
00095 
00096     int UTF8StringEditor::getOffset(const std::string & text, int charIndex)
00097     {
00098         std::string::const_iterator cur, end;
00099         int bytes = 0, i;
00100 
00101         if (charIndex < 0) return 0;
00102 
00103         cur = text.begin();
00104         end = text.end();
00105 
00106         for(i = 0; i < charIndex && cur != end; i++) {
00107             utf8::next(cur, end);
00108         }
00109 
00110         return std::string(text.begin(), cur).size();
00111     }
00112 };
00113 
00114 
00115 
00116 
00117 
00118