token.cc

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/* Copyright (C) 2000, 2001 Stefan Buehler <sbuehler@uni-bremen.de>
 
   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any
   later version.
 
   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 General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA. */
 
#include "arts.h"
#include "messages.h"
#include "token.h"
 
String TokValTypeName[7] = {"String", "Index", "Numeric",
                            "ArrayOfString", "ArrayOfIndex", "Vector",
                            "undefined"};
 
 
// Conversion functions to read TokVal for the 6 different types: 
  
TokVal::operator String() const {
  assert (mtype == String_t);
  return ms;
}
 
TokVal::operator Index() const {
  assert (mtype == Index_t);
  return mn;
}
  
TokVal::operator Numeric() const {
  assert (mtype == Numeric_t);
  return mx;
}
 
 
TokVal::operator ArrayOfString() const {
  assert (mtype == Array_String_t);
  return msv;
}
 
TokVal::operator ArrayOfIndex() const {
  assert (mtype == Array_Index_t);
  return mnv;
}
  
TokVal::operator Vector() const {
  assert (mtype == Vector_t);
  return mxv;
}
 
 
ostream& operator<<(ostream& os, const TokVal& a)
{
  switch (a.mtype)
    {
    case String_t:
      os << a.ms;
      break;
    case Index_t:
      os << a.mn;
      break;
    case Numeric_t:
      os << a.mx;
      break;
    case Array_String_t:
      os << a.msv;
      break;
    case Array_Index_t:
      os << a.mnv;
      break;
    case Vector_t:
      os << a.mxv;
      break;
    default:
      out0 << "Undefined token type.\n";
      exit(1);
    }
  return os;
}
 
 
// main()
// {
//   String a("Test");
//   TokVal tv(a);
 
//   String b=tv;
//   cout << b << '\n';
//   Numeric c = 3.8;
//   TokVal tvtv(c);
//   tv = tvtv;
//   Numeric d = tv;
//   cout << d << '\n';
//   b = tv;                    // should cause an error because of wrong type
// }