ov-class.h

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/*

Copyright (C) 2007-2018 John W. Eaton
Copyright (C) 2009 VZLU Prague

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_ov_class_h)
#define octave_ov_class_h 1

#include "octave-config.h"

#include <cstdlib>

#include <iosfwd>
#include <string>

#include "mx-base.h"
#include "str-vec.h"

#include "error.h"
#include "oct-map.h"
#include "ov-base.h"

namespace octave
{
  class type_info;
}

class octave_value_list;

// Data structures.

class
octave_class : public octave_base_value
{
public:

  octave_class (void)
    : octave_base_value (), map (), c_name (),
      parent_list (), obsolete_copies (0)
  { }

  octave_class (const octave_map& m, const std::string& id,
                const std::list<std::string>& plist)
    : octave_base_value (), map (m), c_name (id),
      parent_list (plist), obsolete_copies (0)
  { }

  octave_class (const octave_map& m, const std::string& id,
                const octave_value_list& parents);

  octave_class (const octave_class& s)
    : octave_base_value (s), map (s.map), c_name (s.c_name),
      parent_list (s.parent_list), obsolete_copies (0)  { }

  ~octave_class (void) = default;

  octave_base_value * clone (void) const { return new octave_class (*this); }

  octave_base_value * unique_clone (void);

  octave_base_value * empty_clone (void) const
  {
    return new octave_class (octave_map (map.keys ()), c_name, parent_list);
  }

  Cell dotref (const octave_value_list& idx);

  Matrix size (void);

  octave_idx_type numel (const octave_value_list&);

  octave_value subsref (const std::string& type,
                        const std::list<octave_value_list>& idx)
  {
    octave_value_list tmp = subsref (type, idx, 1);
    return tmp.length () > 0 ? tmp(0) : octave_value ();
  }

  octave_value_list subsref (const std::string& type,
                             const std::list<octave_value_list>& idx,
                             int nargout);

  static octave_value numeric_conv (const Cell& val,
                                    const std::string& type);

  void assign(const std::string& k, const octave_value& rhs)
  { map.assign (k, rhs); };

  octave_value subsasgn (const std::string& type,
                         const std::list<octave_value_list>& idx,
                         const octave_value& rhs);

  octave_value undef_subsasgn (const std::string& type,
                               const std::list<octave_value_list>& idx,
                               const octave_value& rhs);

  idx_vector index_vector (bool require_integers = false) const;

  dim_vector dims (void) const { return map.dims (); }

  size_t byte_size (void) const;

  // This is the number of elements in each field.  The total number
  // of elements is numel () * nfields ().
  octave_idx_type numel (void) const
  {
    dim_vector dv = dims ();
    return dv.numel ();
  }

  octave_idx_type nfields (void) const { return map.nfields (); }

  size_t nparents (void) const { return parent_list.size (); }

  octave_value reshape (const dim_vector& new_dims) const
  {
    octave_class retval = octave_class (*this);
    retval.map = retval.map_value ().reshape (new_dims);
    return octave_value (new octave_class (retval));
  }

  octave_value resize (const dim_vector& dv, bool = false) const
  {
    octave_class retval = octave_class (*this);
    retval.map.resize (dv);
    return octave_value (new octave_class (retval));
  }

  bool is_defined (void) const { return true; }

  bool isstruct (void) const { return false; }

  bool isobject (void) const { return true; }

  bool is_true (void) const;

  octave_map map_value (void) const { return map; }

  string_vector map_keys (void) const;

  std::list<std::string> parent_class_name_list (void) const
  { return parent_list; }

  string_vector parent_class_names (void) const
  { return string_vector (parent_list); }

  octave_base_value * find_parent_class (const std::string&);

  octave_base_value * unique_parent_class (const std::string&);

  bool is_instance_of (const std::string&) const;

  string_vector string_vector_value (bool pad) const;

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

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

  bool print_name_tag (std::ostream& os, const std::string& name) const;

  void print_with_name (std::ostream& os, const std::string& name,
                        bool print_padding = true);

  bool reconstruct_exemplar (void);

  static void clear_exemplar_map (void);

  bool reconstruct_parents (void);

  bool save_ascii (std::ostream& os);

  bool load_ascii (std::istream& is);

  bool save_binary (std::ostream& os, bool& save_as_floats);

  bool load_binary (std::istream& is, bool swap,
                    octave::mach_info::float_format fmt);

  bool save_hdf5 (octave_hdf5_id loc_id, const char *name, bool save_as_floats);

  bool load_hdf5 (octave_hdf5_id loc_id, const char *name);

  mxArray * as_mxArray (void) const;

private:
  octave_map map;

public:
  int type_id (void) const { return t_id; }
  std::string type_name (void) const { return t_name; }
  std::string class_name (void) const { return c_name; }

  static int static_type_id (void) { return t_id; }
  static std::string static_type_name (void) { return t_name; }
  static std::string static_class_name (void) { return "<unknown>"; }
  static void register_type (octave::type_info&);

private:
  static int t_id;

  static const std::string t_name;
  std::string c_name;
  std::list<std::string> parent_list;

  bool in_class_method (void);
  std::string get_current_method_class (void);

  octave_value subsasgn_common (const octave_value& obj,
                                const std::string& type,
                                const std::list<octave_value_list>& idx,
                                const octave_value& rhs);

  int obsolete_copies;

public:
  // The list of field names and parent classes defines a class.  We
  // keep track of each class that has been created so that we know
  class exemplar_info
  {
  public:

    exemplar_info (void) : field_names (), parent_class_names () { }

    exemplar_info (const octave_value& obj);

    exemplar_info (const exemplar_info& x)
      : field_names (x.field_names),
        parent_class_names (x.parent_class_names) { }

    exemplar_info& operator = (const exemplar_info& x)
    {
      if (&x != this)
        {
          field_names = x.field_names;
          parent_class_names = x.parent_class_names;
        }
      return *this;
    }

    octave_idx_type nfields (void) const { return field_names.numel (); }

    size_t nparents (void) const { return parent_class_names.size (); }

    string_vector fields (void) const { return field_names; }

    std::list<std::string> parents (void) const { return parent_class_names; }

    bool compare (const octave_value& obj) const;

  private:

    string_vector field_names;
    std::list<std::string> parent_class_names;
  };

  // A map from class names to lists of fields.
  static std::map<std::string, exemplar_info> exemplar_map;

  typedef std::map<std::string, exemplar_info>::iterator
    exemplar_iterator;
  typedef std::map<std::string, exemplar_info>::const_iterator
    exemplar_const_iterator;
};

#endif