src/util/string_util.cpp

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//  SuperTux
//  Copyright (C) 2009 Ingo Ruhnke <grumbel@gmx.de>
//
//  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 3 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 program.  If not, see <http://www.gnu.org/licenses/>.

#include <algorithm>

#include "string_util.hpp"

bool
StringUtil::has_suffix(const std::string& data, const std::string& suffix)
{
  if (data.length() >= suffix.length())
  {
    return data.compare(data.length() - suffix.length(), suffix.length(), suffix) == 0;
  }
  else
  {
    return false;
  }
}

bool
StringUtil::numeric_less(const std::string& lhs, const std::string& rhs)
{
  std::string::size_type i = 0;
  std::string::size_type min_len = std::min(lhs.size(), rhs.size());

  while(i < min_len)
  {
    if (isdigit(lhs[i]) && isdigit(rhs[i]))
    {
      // have two digits, so check which number is smaller
      std::string::size_type li = i+1;
      std::string::size_type ri = i+1;

      // find the end of the number in both strings
      while(li < lhs.size() && isdigit(lhs[li])) { li += 1; }
      while(ri < rhs.size() && isdigit(rhs[ri])) { ri += 1; }

      if (li == ri)
      {
        // end is at the same point in both strings, so do a detaile
        // comparism of the numbers
        for(std::string::size_type j = i; j < li; ++j)
        {
          if (lhs[j] != rhs[j])
          {
            return lhs[j] < rhs[j];
          }
        }

        // numbers are the same, so jump to the end of the number and compare
        i = li;
      }
      else
      {
        // numbers have different numbers of digits, so the number
        // with the least digits wins
        return li < ri;
      }
    }
    else
    {
      // do normal character comparism
      if (lhs[i] != rhs[i])
      {
        return lhs[i] < rhs[i];
      }
      else
      {
        // strings are the same so far, so continue
        i += 1;
      }
    }
  }

  return lhs.size() < rhs.size();
}

/* EOF */

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