/*

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 (octave_tree_loop_h)
#define octave_tree_loop_h 1

#if defined (__GNUG__)
#pragma interface
#endif

class octave_value;
class octave_lvalue;

class tree_argument_list;
class tree_expression;
class tree_statement_list;

class tree_walker;

#include "pt-cmd.h"

// While.

class
tree_while_command : public tree_command
{
public:

  tree_while_command (int l = -1, int c = -1)
    : tree_command (l, c), expr (0), list (0) { }

  tree_while_command (tree_expression *e, int l = -1, int c = -1)
    : tree_command (l, c), expr (e), list (0) { }

  tree_while_command (tree_expression *e, tree_statement_list *lst,
		      int l = -1, int c = -1)
    : tree_command (l, c), expr (e), list (lst) { }

  ~tree_while_command (void);

  void eval (void);

  void eval_error (void);

  tree_expression *condition (void) { return expr; }

  tree_statement_list *body (void) { return list; }

  void accept (tree_walker& tw);

private:

  // Expression to test.
  tree_expression *expr;

  // List of commands to execute.
  tree_statement_list *list;

  // No copying!

  tree_while_command (const tree_while_command&);

  tree_while_command& operator = (const tree_while_command&);
};

// For.

class
tree_simple_for_command : public tree_command
{
public:

  tree_simple_for_command (int l = -1, int c = -1)
    : tree_command (l, c), lhs (0), expr (0), list (0) { }

  tree_simple_for_command (tree_expression *le, tree_expression *re,
			   tree_statement_list *lst, int l = -1, int c = -1)
    : tree_command (l, c), lhs (le), expr (re), list (lst) { }

  ~tree_simple_for_command (void);

  void eval (void);

  void eval_error (void);

  tree_expression *left_hand_side (void) { return lhs; }

  tree_expression *control_expr (void) { return expr; }

  tree_statement_list *body (void) { return list; }

  void accept (tree_walker& tw);

private:

  // Expression to modify.
  tree_expression *lhs;

  // Expression to evaluate.
  tree_expression *expr;

  // List of commands to execute.
  tree_statement_list *list;

  void do_for_loop_once (octave_lvalue &ult, const octave_value& rhs,
			 bool& quit);

  // No copying!

  tree_simple_for_command (const tree_simple_for_command&);

  tree_simple_for_command& operator = (const tree_simple_for_command&);
};

class
tree_complex_for_command : public tree_command
{
public:

  tree_complex_for_command (int l = -1, int c = -1)
    : tree_command (l, c), lhs (0), expr (0), list (0) { }

  tree_complex_for_command (tree_argument_list *le, tree_expression *re,
			    tree_statement_list *lst, int l = -1, int c = -1)
    : tree_command (l, c), lhs (le), expr (re), list (lst) { }

  ~tree_complex_for_command (void);

  void eval (void);

  void eval_error (void);

  tree_argument_list *left_hand_side (void) { return lhs; }

  tree_expression *control_expr (void) { return expr; }

  tree_statement_list *body (void) { return list; }

  void accept (tree_walker& tw);

private:

  // Expression to modify.
  tree_argument_list *lhs;

  // Expression to evaluate.
  tree_expression *expr;

  // List of commands to execute.
  tree_statement_list *list;

  void do_for_loop_once (octave_lvalue &val_ref, octave_lvalue &key_ref,
			 const octave_value& val, const octave_value& key,
			 bool& quit);

  // No copying!

  tree_complex_for_command (const tree_complex_for_command&);

  tree_complex_for_command& operator = (const tree_complex_for_command&);
};

#endif

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