/*

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 <iostream.h>

#include "lo-utils.h"

#include "defun.h"
#include "error.h"
#include "help.h"
#include "ov-list.h"
#include "unwind-prot.h"

octave_allocator
octave_list::allocator (sizeof (octave_list));

int
octave_list::t_id (-1);

const string
octave_list::t_name ("list");

octave_value
octave_list::index (const octave_value_list& idx) const
{
  octave_value retval;

  if (idx.length () == 1)
    {
      double d = idx(0).double_value ();

      if (! error_state)
	{
	  if (D_NINT (d) == d)
	    {
	      int n = lst.length ();

	      int i = static_cast<int> (d);

	      if (i > 0 && i <= n)
		retval = lst(i-1);
	      else
		error ("list index = %d out of range", i);
	    }
	  else
	    error ("list index must be an integer");
	}
    }
  else
    error ("lists may only be indexed by a single scalar");

  return retval;
}

void
octave_list::print (ostream& os, bool)
{
  begin_unwind_frame ("octave_list_print");

  unwind_protect_int (list_indent);

  os.form ("\n%*s{\n", list_indent, "");

  increment_list_indent ();

  int n = lst.length ();

  for (int i = 0; i < n; i++)
    {
      bool pad_after = false;

      octave_value val = lst(i);

      os.form ("%*s", list_indent, "");

      if (val.print_as_scalar ())
	os << " ";
      else if (val.is_list ())
	pad_after = true;
      else
	{
	  pad_after = true;

	  os << "\n\n";
	}

      val.print (os);

      if (pad_after)
	os << "\n";
    }

  decrement_list_indent ();

  os.form ("%*s%s", list_indent, "", "}\n");

  run_unwind_frame ("octave_list_print");
}

DEFUN (make_list, args, ,
  "make_list (ARGS)\n\
\n\
Create a new list from ARGS.")
{
  return octave_value (args);
}

DEFUN (append, args, ,
  "append (LIST, ARGS)\n\
\n\
Return a new list created by appending ARGS to LIST")
{
  octave_value retval;

  int nargin = args.length ();

  if (nargin > 1)
    {
      octave_value_list tmp = args(0).list_value ();

      if (! error_state)
	{
	  for (int i = 1; i < nargin; i++)
	    tmp.append (args(i));

	  retval = tmp;
	}
    }
  else
    print_usage ("append");

  return retval;
}

DEFUN (reverse, args, ,
  "reverse (LIST)\n\
\n\
Return a new list created by reversing the elements of LIST")
{
  octave_value retval;

  int nargin = args.length ();

  if (nargin == 1)
    {
      octave_value_list tmp = args(0).list_value ();

      if (! error_state)
	  retval = tmp.reverse ();
    }
  else
    print_usage ("reverse");

  return retval;
}

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