////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2018-2022 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_settings_h)
#define octave_settings_h 1

#include "octave-config.h"

#include <cstddef>

class octave_value;
class octave_value_list;

OCTAVE_NAMESPACE_BEGIN

  // Most settings for the interpreter are stored in the classes which
  // they affect (intput_system, output_system, load_path, etc.  Some
  // don't really fit anywhere else.  For example, there is no single
  // lexer or parser object, so we store settings for those things
  // here.

  class settings
  {
  public:

    settings (void);

    settings (const settings&) = delete;

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

    ~settings (void) = default;

    octave_value display_tokens (const octave_value_list& args, int nargout);

    bool display_tokens (void) const { return m_display_tokens; }

    bool display_tokens (bool flag)
    {
      bool val = m_display_tokens;
      m_display_tokens = flag;
      return val;
    }

    // Read only.
    std::size_t token_count (void) const { return m_token_count; }

    void increment_token_count (void) { ++m_token_count; }

    octave_value lexer_debug_flag (const octave_value_list& args, int nargout);

    bool lexer_debug_flag (void) const { return m_lexer_debug_flag; }

    bool lexer_debug_flag (bool flag)
    {
      bool val = m_lexer_debug_flag;
      m_lexer_debug_flag = flag;
      return val;
    }

  private:

    // Display tokens as they are processed, for debugging.
    bool m_display_tokens = false;

    // Number of tokens processed since interpreter startup.
    std::size_t m_token_count = 0;

    // Internal variable for lexer debugging state.
    bool m_lexer_debug_flag = false;
  };

OCTAVE_NAMESPACE_END

#endif
