include/Geant4/G4Tokenizer.hh

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
0005 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
0006 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
0007 // * conditions of the Geant4 Software License,  included in the file *
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0010 // *                                                                  *
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0017 // *                                                                  *
0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
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0023 // * acceptance of all terms of the Geant4 Software license.          *
0024 // ********************************************************************
0025 //
0026 // G4Tokenizer
0027 //
0028 // Class description:
0029 //
0030 // String tokenizer.
0031 // It derives from the implementation of the Rogue Wave RWTokenizer.
0032 // It intrinsically uses STL string.
0033
0034 // Author: G.Cosmo, 11 October 2001
0035 // --------------------------------------------------------------------
0036 #ifndef G4Tokenizer_hh
0037 #define G4Tokenizer_hh 1
0038
0039 #include "G4String.hh"
0040
0041 class G4Tokenizer
0042 {
0043  public:
0044   G4Tokenizer(const G4String& stn)
0045     : string2tokenize(stn)
0046     , actual(0)
0047   {}
0048
0049   G4String operator()(const char* str = " \t\n", std::size_t l = 0)
0050   {
0051     std::size_t i, j, tmp;
0052     G4bool hasws = false;
0053     if(l == 0)
0054       l = strlen(str);
0055
0056     // Skip leading delimeters
0057     while(actual < string2tokenize.size())
0058     {
0059       for(i = 0; i < l; ++i)
0060       {
0061         if(string2tokenize[(G4int)actual] == str[i])
0062           hasws = true;
0063       }
0064       if(hasws)
0065       {
0066         ++actual;
0067         hasws = false;
0068       }
0069       else
0070         break;
0071     }
0072
0073     for(j = actual; j < string2tokenize.size(); ++j)
0074     {
0075       for(i = 0; i < l; ++i)
0076         if(string2tokenize[(G4int)j] == str[i])
0077           break;
0078       if(i < l)
0079         break;
0080     }
0081     if(j != string2tokenize.size())
0082     {
0083       tmp    = actual;
0084       actual = j + 1;
0085       return string2tokenize.substr(tmp, j - tmp);
0086     }
0087     else
0088     {
0089       tmp    = actual;
0090       actual = j;
0091       return string2tokenize.substr(tmp, j - tmp);
0092     }
0093   }
0094
0095  private:
0096   G4String string2tokenize;
0097   std::size_t actual;
0098 };
0099
0100 #endif