//
// ********************************************************************
// * 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 *
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//
//
// $Id$
//
// 
//---------------------------------------------------------------
//  GEANT 4 class header file
//
//  G4Tokenizer
//
//  Class description:
//
//  String tokenizer.
//  It derives from the implementation of the Rogue Wave
//  RWTokenizer. It intrinsically uses STL string.

//---------------------------------------------------------------

#ifndef __G4Tokenizer
#define __G4Tokenizer

#include "G4String.hh"

class G4Tokenizer 
{
public:
  G4Tokenizer(const G4String& stn):string2tokenize(stn),actual(0){}

  G4String operator()(const char* str=" \t\n",size_t l=0)
    {
      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[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[j]==str[i]) break;
	  if(i<l) break;
	}
      if(j!=string2tokenize.size())
	{
	  tmp=actual;
	  actual=j+1;
	  return string2tokenize(tmp,j-tmp);
	}
      else
	{
	  tmp=actual;
	  actual=j;
	  return string2tokenize(tmp,j-tmp);
	}
    } 

private:

  G4String string2tokenize;
  size_t actual;

};

#endif

