index_list_util.h

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/*
 * Copyright (c) 2017:  G-CSC, Goethe University Frankfurt
 * Author: Sebastian Reiter
 * 
 * This file is part of UG4.
 * 
 * UG4 is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License version 3 (as published by the
 * Free Software Foundation) with the following additional attribution
 * requirements (according to LGPL/GPL v3 §7):
 * 
 * (1) The following notice must be displayed in the Appropriate Legal Notices
 * of covered and combined works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (2) The following notice must be displayed at a prominent place in the
 * terminal output of covered works: "Based on UG4 (www.ug4.org/license)".
 * 
 * (3) The following bibliography is recommended for citation and must be
 * preserved in all covered files:
 * "Reiter, S., Vogel, A., Heppner, I., Rupp, M., and Wittum, G. A massively
 *   parallel geometric multigrid solver on hierarchically distributed grids.
 *   Computing and visualization in science 16, 4 (2013), 151-164"
 * "Vogel, A., Reiter, S., Rupp, M., Nägel, A., and Wittum, G. UG4 -- a novel
 *   flexible software system for simulating pde based models on high performance
 *   computers. Computing and visualization in science 16, 4 (2013), 165-179"
 * 
 * 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 Lesser General Public License for more details.
 */
 
#ifndef __H__UG_index_list_util
#define __H__UG_index_list_util
 
#include <cctype>
#include <cstring>
#include <vector>
#include <sstream>
 
namespace ug {
 
template <class ind_t>
std::string IndexListToRangeString (const std::vector<ind_t>& inds)
{
  using namespace std;
  stringstream ss;
 
  for(size_t i = 0; i < inds.size(); ++i)
  {
    if(i > 0)
      ss << ",";
 
    const ind_t first = inds[i];
    ind_t cur = first;
    while((i + 1 < inds.size()) && inds[i+1] == cur + 1){
      ++cur;
      ++i;
    }
 
    if(first == cur)
      ss << first;
    else if(first + 1 == cur)
      ss << first << "," << cur;
    else
      ss << first << "-" << cur;
  }
 
  return ss.str();
}
 
 
template <class ind_t>
void RangeStringToIndexList (std::vector<ind_t>& indsOut, const char* rangeString)
{
  indsOut.clear();
 
  const char* cur = rangeString;
  
  bool readingRange = false;
  ind_t lastInd = 0;
 
  while(*cur) {
    ind_t ind = 0;
    while(*cur && *cur != ',' && *cur != '-'){
      if(isdigit(*cur))
        ind = ind * 10 + *cur - '0';
      ++cur;
    }
 
    if(readingRange){
      readingRange = false;
      for(ind_t i = lastInd; i <= ind; ++i)
        indsOut.push_back (i);
    }
    else{
      switch(*cur){
        case 0: indsOut.push_back(ind); break;
        case ',': indsOut.push_back(ind); break;
        case '-': lastInd = ind; readingRange = true; break;
      }
    }
 
    if(*cur)
      ++cur;    
  }
}
 
  
}// end of namespace
 
#endif  //__H__UG_index_list_util