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stringhelp.cpp

/*
 * stringhelp.cpp - string wrapping
 * Copyright (C) 2003-2005  Justin Karneges
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */

#include "stringhelp.h"

static QString getNext(QString *str)
{
      if(str->isEmpty())
            return QString();

      // are we in space?
      int n = 0;
      if(str->at(n).isSpace())
      {
            // get out of it
            while(n < (int)str->length() && str->at(n).isSpace())
                  ++n;
            if(n == (int)str->length())
                  return QString();
      }
      // find end or next space
      while(n < (int)str->length() && !str->at(n).isSpace())
            ++n;
      QString result = str->mid(0, n);
      *str = str->mid(n);
      return result;
}

// wraps a string against a fixed width
QStringList wrapString(const QString &str, int wid)
{
      QStringList lines;
      QString cur;
      QString tmp = str;
      bool firstword = true;
      //printf("parsing: [%s]\n", qPrintable(tmp));
      while(1)
      {
            QString word = getNext(&tmp);
            if(word.isNull())
            {
                  lines += cur;
                  break;
            }
            //printf("word:[%s]\n", qPrintable(word));
            if(!cur.isEmpty())
            {
                  if((int)cur.length() + (int)word.length() > wid)
                  {
                        lines += cur;
                        cur = "";
                  }
            }
            if(cur.isEmpty() && !firstword)
            {
                  // trim the whitespace in front
                  for(int n = 0; n < (int)word.length(); ++n)
                  {
                        if(!word.at(n).isSpace())
                        {
                              if(n > 0)
                                    word = word.mid(n);
                              break;
                        }
                  }
            }
            cur += word;
            firstword = false;
      }
      return lines;
}

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