Panzer_String_Utilities.cpp

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// @HEADER
// *****************************************************************************
//           Panzer: A partial differential equation assembly
//       engine for strongly coupled complex multiphysics systems
//
// Copyright 2011 NTESS and the Panzer contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#include "Panzer_String_Utilities.hpp"
#include <sstream>

namespace panzer {

  void trim(std::string& str)
  {
    const std::string whitespace(" \t\n");
    
    const auto strBegin = str.find_first_not_of(whitespace);
    if (strBegin == std::string::npos) {
      str = "";
      return; // no content
    }

    const auto strEnd = str.find_last_not_of(whitespace);
    const auto strRange = strEnd - strBegin + 1;

    str = str.substr(strBegin, strRange);
    return;
  }
  
  void StringTokenizer(std::vector<std::string>& tokens,
           const std::string& str,
           const std::string delimiters,bool trim)
  {
    using std::string;

    // Skip delimiters at beginning.
    string::size_type lastPos = str.find_first_not_of(delimiters, 0);
    // Find first "non-delimiter".
    string::size_type pos     = str.find_first_of(delimiters, lastPos);
    
    while (string::npos != pos || string::npos != lastPos) {

      // grab token, trim if desired
      std::string token = str.substr(lastPos,pos-lastPos);
      if(trim)
  panzer::trim(token);

      // Found a token, add it to the vector.
      tokens.push_back(token);

      if(pos==string::npos)
        break;

      // Skip delimiters.  Note the "not_of"
      lastPos = str.find_first_not_of(delimiters, pos);
      // Find next "non-delimiter"
      pos = str.find_first_of(delimiters, lastPos);
    }
    
  }

  void TokensToDoubles(std::vector<double> & values,const std::vector<std::string> & tokens)
  {
     // turn tokens into doubles (its a miracle!)
     for(std::size_t i=0;i<tokens.size();i++) {
        double value = 0.0;
        std::stringstream ss;
        ss << tokens[i];
        ss >> value; 
      
        values.push_back(value);
     }
  }

  void TokensToInts(std::vector<int> & values,const std::vector<std::string> & tokens)
  {
     // turn tokens into doubles (its a miracle!)
     for(std::size_t i=0;i<tokens.size();i++) {
        int value = 0;
        std::stringstream ss;
        ss << tokens[i];
        ss >> value; 
      
        values.push_back(value);
     }
  }
}