////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1994-2020 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// 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
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if ! defined (octave_pt_cmd_h)
#define octave_pt_cmd_h 1

#include "octave-config.h"

#include <string>

#include "ov-fcn.h"
#include "pt.h"
#include "pt-bp.h"
#include "pt-walk.h"

namespace octave
{
  // A base class for commands.

  class tree_command : public tree
  {
  public:

    tree_command (int l = -1, int c = -1)
      : tree (l, c) { }

    // No copying!

    tree_command (const tree_command&) = delete;

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

    virtual ~tree_command (void) = default;
  };

  // No-op.

  class tree_no_op_command : public tree_command
  {
  public:

    tree_no_op_command (const std::string& cmd = "no_op", bool e = false,
                        int l = -1, int c = -1)
      : tree_command (l, c), m_eof (e), m_orig_cmd (cmd) { }

    // No copying!

    tree_no_op_command (const tree_no_op_command&) = delete;

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

    ~tree_no_op_command (void) = default;

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

    bool is_end_of_fcn_or_script (void) const
    {
      return (m_orig_cmd == "endfunction" || m_orig_cmd == "endscript");
    }

    bool is_end_of_file (void) const { return m_eof; }

    std::string original_command (void) { return m_orig_cmd; }

  private:

    bool m_eof;

    std::string m_orig_cmd;
  };

  // Function definition.

  class tree_function_def : public tree_command
  {
  public:

    tree_function_def (octave_function *f, int l = -1, int c = -1)
      : tree_command (l, c), m_fcn (f) { }

    // No copying!

    tree_function_def (const tree_function_def&) = delete;

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

    ~tree_function_def (void) = default;

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

    octave_value function (void) { return m_fcn; }

  private:

    octave_value m_fcn;

    tree_function_def (const octave_value& v, int l = -1, int c = -1)
      : tree_command (l, c), m_fcn (v) { }
  };
}

#endif
