G4Tokenizer.hh

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// G4Tokenizer
//
// Class description:
//
// String tokenizer.
// It derives from the implementation of the Rogue Wave RWTokenizer.
// It intrinsically uses STL string.
 
// Author: G.Cosmo, 11 October 2001
// --------------------------------------------------------------------
#ifndef G4Tokenizer_hh
#define G4Tokenizer_hh 1
 
#include "G4String.hh"
 
class G4Tokenizer
{
 public:
  G4Tokenizer(const G4String& stn)
    : string2tokenize(stn)
    , actual(0)
  {}
 
  G4String operator()(const char* str = " \t\n", std::size_t l = 0)
  {
    std::size_t i, j, tmp;
    G4bool hasws = false;
    if(l == 0)
      l = strlen(str);
 
    // Skip leading delimeters
    while(actual < string2tokenize.size())
    {
      for(i = 0; i < l; ++i)
      {
        if(string2tokenize[(G4int)actual] == str[i])
          hasws = true;
      }
      if(hasws)
      {
        ++actual;
        hasws = false;
      }
      else
        break;
    }
 
    for(j = actual; j < string2tokenize.size(); ++j)
    {
      for(i = 0; i < l; ++i)
        if(string2tokenize[(G4int)j] == str[i])
          break;
      if(i < l)
        break;
    }
    if(j != string2tokenize.size())
    {
      tmp    = actual;
      actual = j + 1;
      return string2tokenize.substr(tmp, j - tmp);
    }
    else
    {
      tmp    = actual;
      actual = j;
      return string2tokenize.substr(tmp, j - tmp);
    }
  }
 
 private:
  G4String string2tokenize;
  std::size_t actual;
};
 
#endif