/*

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__) && ! defined (NO_PRAGMA_INTERFACE_IMPLEMENTATION)
#pragma implementation
#endif

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

#include "error.h"
#include "oct-obj.h"
#include "pt-bp.h"
#include "pt-jump.h"
#include "pt-walk.h"

class octave_value_list;

// Break.

// Nonzero means we're breaking out of a loop or function body.
int tree_break_expression::breaking = 0;

octave_value
tree_break_expression::rvalue (void)
{
  // Even if we have an error we should still enter debug mode.
  MAYBE_DO_BREAKPOINT;

  if (! error_state)
    breaking = 1;

  return true;
}

void
tree_break_expression::accept (tree_walker& tw)
{
  tw.visit_break_expression (*this);
}

// Continue.

// Nonzero means we're jumping to the end of a loop.
int tree_continue_expression::continuing = 0;

octave_value
tree_continue_expression::rvalue (void)
{
  MAYBE_DO_BREAKPOINT;

  if (! error_state)
    continuing = 1;

  return true;
}

void
tree_continue_expression::accept (tree_walker& tw)
{
  tw.visit_continue_expression (*this);
}

// Return.

// Nonzero means we're returning from a function.  Global because it
// is also needed in tree-expr.cc.
int tree_return_expression::returning = 0;

octave_value
tree_return_expression::rvalue (void)
{
  MAYBE_DO_BREAKPOINT;

  if (! error_state)
    returning = 1;

  return true;
}

void
tree_return_expression::accept (tree_walker& tw)
{
  tw.visit_return_expression (*this);
}

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