/*

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_binop_h)
#define octave_tree_binop_h 1

#if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION)
#pragma interface
#endif

#include <string>

class tree_walker;

class octave_value;
class octave_value_list;
class octave_lvalue;

#include "ov.h"
#include "pt-exp.h"

// Binary expressions.

class
tree_binary_expression : public tree_expression
{
public:

  tree_binary_expression (int l = -1, int c = -1,
			  octave_value::binary_op t
			    = octave_value::unknown_binary_op)
    : tree_expression (l, c), op_lhs (0), op_rhs (0), etype (t) { }

  tree_binary_expression (tree_expression *a, tree_expression *b,
			  int l = -1, int c = -1,
			  octave_value::binary_op t
			    = octave_value::unknown_binary_op)
    : tree_expression (l, c), op_lhs (a), op_rhs (b), etype (t) { }

  ~tree_binary_expression (void)
    {
      delete op_lhs;
      delete op_rhs;
    }

  bool has_magic_end (void) const
    {
      return ((op_lhs && op_lhs->has_magic_end ())
	      || (op_rhs && op_rhs->has_magic_end ()));
    }

  bool is_binary_expression (void) const { return true; }

  bool rvalue_ok (void) const { return true; }

  octave_value rvalue (void);

  octave_value_list rvalue (int nargout);

  void eval_error (void);

  std::string oper (void) const;

  octave_value::binary_op op_type (void) const { return etype; }

  tree_expression *lhs (void) { return op_lhs; }
  tree_expression *rhs (void) { return op_rhs; }

  void accept (tree_walker& tw);

protected:

  // The operands for the expression.
  tree_expression *op_lhs;
  tree_expression *op_rhs;

private:

  // The type of the expression.
  octave_value::binary_op etype;

  // No copying!

  tree_binary_expression (const tree_binary_expression&);

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

// Boolean expressions.

class
tree_boolean_expression : public tree_binary_expression
{
public:

  enum type
    {
      unknown,
      bool_and,
      bool_or
    };

  tree_boolean_expression (int l = -1, int c = -1, type t = unknown)
    : tree_binary_expression (l, c), etype (t) { }

  tree_boolean_expression (tree_expression *a, tree_expression *b,
			   int l = -1, int c = -1, type t = unknown)
    : tree_binary_expression (a, b, l, c), etype (t) { }

  ~tree_boolean_expression (void) { }

  bool is_boolean_expression (void) const { return true; }

  bool rvalue_ok (void) const { return true; }

  octave_value rvalue (void);

  octave_value_list rvalue (int nargout);

  std::string oper (void) const;

  type op_type (void) const { return etype; }

private:

  // The type of the expression.
  type etype;

  // No copying!

  tree_boolean_expression (const tree_boolean_expression&);

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

#endif

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