/*

Copyright (C) 1996, 1997 John W. Eaton

This file is part of Octave.

Octave 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.

Octave 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 Octave; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#if defined (__GNUG__)
#pragma implementation
#endif

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "error.h"
#include "oct-obj.h"

octave_value_list&
octave_value_list::prepend (const octave_value& val)
{
  int n = length ();

  resize (n + 1);

  while (n > 0)
    {
      elem (n) = elem (n - 1);
      n--;
    }

  elem (0) = val;
  
  return *this;
}

octave_value_list&
octave_value_list::append (const octave_value& val)
{
  int n = length ();

  resize (n + 1);

  elem (n) = val;

  return *this;
}

octave_value_list&
octave_value_list::append (const octave_value_list& lst)
{
  int len = length ();
  int lst_len = lst.length ();

  resize (len + lst_len);

  for (int i = 0; i < lst_len; i++)
    elem (len + i) = lst (i);

  return *this;
}

octave_value_list&
octave_value_list::reverse (void)
{
  int n = length ();

  for (int i = 0; i < n / 2; i++)
    {
      octave_value tmp = elem (i);
      elem (i) = elem (n - i - 1);
      elem (n - i - 1) = tmp;
    }

  return *this;
}

bool
octave_value_list::all_strings_p (void) const
{
  int n = length ();

  for (int i = 0; i < n; i++)
    if (! elem(i).is_string ())
      return 0;

  return 1;
}

string_vector
octave_value_list::make_argv (const string& fcn_name) const
{
  string_vector argv;

  if (all_strings_p ())
    {
      int n = length ();
      argv.resize (n+1);
      argv[0] = fcn_name;

      for (int i = 0; i < n; i++)
	argv[i+1] = elem(i).string_value ();
    }
  else
    error ("%s: expecting all arguments to be strings", fcn_name.c_str ());

  return argv;
}

/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/