pt-const.h

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/*

Copyright (C) 1993-2012 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 3 of the License, 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, see
<http://www.gnu.org/licenses/>.

*/

#if !defined (octave_tree_const_h)
#define octave_tree_const_h 1

#include <iosfwd>
#include <string>

#include "oct-alloc.h"

class octave_value_list;
class tree_walker;

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

class
tree_constant : public tree_expression
{
public:

  tree_constant (int l = -1, int c = -1)
    : tree_expression (l, c), val (), orig_text () { }

  tree_constant (const octave_value& v, int l = -1, int c = -1)
    : tree_expression (l, c), val (v), orig_text () { }

  tree_constant (const octave_value& v, const std::string& ot,
                 int l = -1, int c = -1)
    : tree_expression (l, c), val (v), orig_text (ot) { }

  ~tree_constant (void) { }

  bool has_magic_end (void) const { return false; }

  // Type.  It would be nice to eliminate the need for this.

  bool is_constant (void) const { return true; }

  void maybe_mutate (void) { val.maybe_mutate (); }

  void print (std::ostream& os, bool pr_as_read_syntax = false,
              bool pr_orig_txt = true);

  void print_raw (std::ostream& os, bool pr_as_read_syntax = false,
                  bool pr_orig_txt = true);

  bool rvalue_ok (void) const { return true; }

  octave_value rvalue1 (int = 1) { return val; }

  octave_value_list rvalue (int nargout);

  tree_expression *dup (symbol_table::scope_id scope,
                        symbol_table::context_id context) const;

  void accept (tree_walker& tw);

  // Store the original text corresponding to this constant for later
  // pretty printing.

  void stash_original_text (const std::string& s) { orig_text = s; }

  std::string original_text (void) const { return orig_text; }

private:

  // The actual value that this constant refers to.
  octave_value val;

  // The original text form of this constant.
  std::string orig_text;

  // No copying!

  tree_constant (const tree_constant&);

  tree_constant& operator = (const tree_constant&);

  DECLARE_OCTAVE_ALLOCATOR
};

#endif