ov-class.h

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/*

Copyright (C) 2007-2012 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
<http://www.gnu.org/licenses/>.

*/

#if !defined (octave_class_h)
#define octave_class_h 1

#include <cstdlib>

#include <iosfwd>
#include <string>

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

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

class octave_value_list;

class tree_walker;

// 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) { }

  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);

  octave_value_list
  do_multi_index_op (int nargout, const octave_value_list& idx)
  {
    return subsref ("(", std::list<octave_value_list> (1, idx), 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 (void) 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 is_map (void) const { return false; }

  bool is_object (void) const { return true; }

  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&);

  string_vector all_strings (bool pad) const;

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

  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,
                    oct_mach_info::float_format fmt);

#if defined (HAVE_HDF5)
  bool save_hdf5 (hid_t loc_id, const char *name, bool save_as_floats);

  bool load_hdf5 (hid_t loc_id, const char *name);
#endif

  mxArray *as_mxArray (void) const;

private:

  octave_map map;

  DECLARE_OCTAVE_ALLOCATOR

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 (void);

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.length (); }

    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