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/usr/include/votca/tools/rangeparser.h is in libvotca-tools-dev 1.2.4-1.1.

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The actual contents of the file can be viewed below.

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/* 
 * Copyright 2009-2011 The VOTCA Development Team (http://www.votca.org)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

#ifndef _RANGEPARSER_H
#define	_RANGEPARSER_H

#include <list>
#include <string>
#include <ostream>

namespace votca { namespace tools {

using namespace std;

/**
 * \brief RangeParser
 *
 * parse strings like min:step:max, not flexible enough yet to be really useful
 */
class RangeParser
{
public:
    RangeParser();
    
    void Parse(string range);

    void Add(int begin, int end, int stride=1);
    
private:
    struct block_t {
        block_t() {}
        block_t(const int &begin, const int &end, const int &stride)
        : _begin(begin), _end(end), _stride(stride) {}
        
        int _begin, _end, _stride;
    };

public:
    
    struct iterator {
        iterator() {}
        
        int operator*() const
            { return _current; }
        
        RangeParser::iterator &operator++();                      
        
        bool operator==(const RangeParser::iterator &);                      
        bool operator!=(const RangeParser::iterator &);                      
         
    private:
        RangeParser *_parent;
        
        iterator(RangeParser *, list<block_t>::iterator);
        list<block_t>::iterator _block;
        int _current;
        
        friend class RangeParser;
    };
    
    RangeParser::iterator begin();
    RangeParser::iterator end();
       
private:
    
    void ParseBlock(string block);
    int ToNumber(string str);
        
    list< block_t > _blocks;    
    
    bool _has_begin, _has_end;
    int _begin, _end;

    friend std::ostream &operator<<(std::ostream &out, const RangeParser &rp);
    
};

inline void RangeParser::Add(int begin, int end, int stride)
{
    _blocks.push_back(block_t(begin, end, stride));
}

inline RangeParser::iterator RangeParser::begin()
{
    return RangeParser::iterator(this, _blocks.begin());
}

inline RangeParser::iterator RangeParser::end()
{
    return RangeParser::iterator(this, _blocks.end());
}

inline RangeParser::iterator::iterator(RangeParser *parent, list<block_t>::iterator block)
    : _parent(parent), _block(block)
{
    if(block != parent->_blocks.end())
        _current = (*block)._begin;
    else
        _current = -1;
}
            
inline bool RangeParser::iterator::operator==(const RangeParser::iterator &i)
{
    return  (_block == i._block) && (_current == i._current);
}

inline bool RangeParser::iterator::operator!=(const RangeParser::iterator &i)
{
    return  !((_block == i._block) && (_current == i._current));
}

inline std::ostream &operator<<(std::ostream &out, const RangeParser &rp)
{
      std::list< RangeParser::block_t >::const_iterator iter(rp._blocks.begin());
      for(; iter!=rp._blocks.end(); ++iter) {
          if(iter!=rp._blocks.begin())
              out << ",";
          if(iter->_begin == iter->_end)
              out << iter->_begin;
          else if(iter->_stride == 1)
              out << iter->_begin << ":" << iter->_end;
          else
              out << iter->_begin << ":" << iter->_stride << ":" << iter->_end;
      }
      return out;
}

}}

#endif	/* _RANGEPARSER_H */