/*

Copyright (C) 1996-2017 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_pt_colon_h)
#define octave_pt_colon_h 1

#include "octave-config.h"

#include <string>

class octave_value;
class octave_value_list;

#include "pt-exp.h"
#include "pt-walk.h"
#include "symtab.h"

namespace octave
{
  // Colon expressions.

  class tree_colon_expression : public tree_expression
  {
  public:

    tree_colon_expression (int l = -1, int c = -1)
      : tree_expression (l, c), op_base (nullptr), op_limit (nullptr),
        op_increment (nullptr), save_base (false) { }

    tree_colon_expression (tree_expression *bas, tree_expression *lim,
                           int l = -1, int c = -1)
      : tree_expression (l, c), op_base (bas), op_limit (lim),
        op_increment (nullptr), save_base (false) { }

    tree_colon_expression (tree_expression *bas, tree_expression *lim,
                           tree_expression *inc, int l = -1, int c = -1)
      : tree_expression (l, c), op_base (bas), op_limit (lim),
        op_increment (inc), save_base (false) { }

    // No copying!

    tree_colon_expression (const tree_colon_expression&) = delete;

    tree_colon_expression& operator = (const tree_colon_expression&) = delete;

    ~tree_colon_expression (void)
    {
      if (! save_base)
        delete op_base;

      delete op_limit;
      delete op_increment;
    }

    bool has_magic_end (void) const
    {
      return ((op_base && op_base->has_magic_end ())
              || (op_limit && op_limit->has_magic_end ())
              || (op_increment && op_increment->has_magic_end ()));
    }

    void preserve_base (void) { save_base = true; }

    bool rvalue_ok (void) const { return true; }

    void eval_error (const std::string& s) const;

    tree_expression * base (void) { return op_base; }

    tree_expression * limit (void) { return op_limit; }

    tree_expression * increment (void) { return op_increment; }

    tree_expression * dup (symbol_scope& scope) const;

    void accept (tree_walker& tw)
    {
      tw.visit_colon_expression (*this);
    }

  private:

    // The components of the expression.
    tree_expression *op_base;
    tree_expression *op_limit;
    tree_expression *op_increment;

    bool save_base;
  };
}

#if defined (OCTAVE_USE_DEPRECATED_FUNCTIONS)

OCTAVE_DEPRECATED (4.4, "use 'octave::tree_colon_expression' instead")
typedef octave::tree_colon_expression tree_colon_expression;

#endif

#endif