Implement some embryonic handle-classdef semantic. * libinterp/octave-value/ov-classdef.h (cdef_object_rep::subsasgn, handle_cdef_object::subsasgn, octave_classdef::subsasgn): New method declarations. (handle_cdef_object::~handle_cdef_object): New destructor declaration. (cdef_class::cdef_class_rep::handle_class): New boolean field. (cdef_class::cdef_class_rep::cdef_class_rep): Initialize it. (cdef_class::cdef_class_rep::mark_as_handle_class, cdef_class::cdef_class_rep::is_handle_class, cdef_class::mark_as_handle_class, cdef_class::is_handle_class): Manipulate it. (cdef_class::cdef_class_rep::get_name): New method. (cdef_class::get_name): Use it. (cdef_class::cdef_class_rep::initialize_object, cdef_class::cdef_class_rep::subsref_meta, cdef_class::cdef_class_rep::run_constructor, cdef_class::cdef_class_rep::construct, cdef_class:initialize_object, cdef_class::subsref_meta, cdef_class::run_constructor, cdef_class::construct): New methods. (cdef_class::cdef_class_rep::find_method, cdef_class::find_method): Add "local" argument. (cdef_class::cdef_class_rep::find_names, cdef_class::find_names): Change signature to use std::set and a boolean flag. (cdef_class::cdef_class_rep::find_methods, cdef_class::find_methods): Change signature to use a boolean flag as second argument. (cdef_class::make_meta_class): New static method. (cdef_class::get_method_function, cdef_class::get_constructor_function): New methods. (cdef_property::cdef_property_rep::set_value, cdef_property::set_value): Make cdef_object argument non const. (cdef_property::cder_property_rep::is_relative_set): New method. (cdef_property::get_get_access, cdef_property::get_set_access): Delete methods. (cdef_property::check_get_access, cdef_property::check_set_access): Remove string argument. (cdef_method::get_access): Delete method. (cdef_method::check_access): Remove string argument. * libinterp/octave-value/ov-classdef.cc (gripe_method_access, gripe_property_access): Support access specified as cell array of classes. (make_function_of_class): New static function(s). (check_access (std::string, std::string), superclass_access): Remove static functions. (lookup_class): Use symbol_table when class hasn't been loaded yet. (lookup_classes): Returns std::list<cdef_class> instead of Cell. (class_get_superclasses, class_get_inferiorclasses): Use it. (to_ov (const std::list<cdef_class>&)): New static function. (get_class_context, check_access (const cdef_class&, const octave_value&)): Likewise. (handle_cdef_object::subsref): Use new signature of access check methods. (property_get_defaultvalue): New built-in property accessor. (make_class): Change signature to support multiple inheritance. Set "Sealed" to false by default. Determine value for HandleCompatible property and handle-class representation. (make_property): Take cdef_class as first argument. Add DefaultValue and HasDefault properties. Call make_function_of_class for property accessors. (make_attribute): Take cdef_class as first argument. (make_method): Likewise. Call make_function_of_class. (make_method (octave_builtin::fcn)): Do no construct a function handle object. (octave_classdef::subsasgn, handle_cdef_object::subsasgn): New method. (class octave_classdef_proxy): New class. (cdef_class::get_method_function): Use it, new method. (handle_cdef_object::~handle_cdef_object): New destructor. (cdef_class_rep::find_method): New boolean "local" argument. When true, only look into the current class, not in superclasses. (cdef_class_rep::find_methods): New signature. (cdef_class_rep::get_methods): Use it. (cdef_class_rep::find_properties): New signature. (cdef_class_rep::get_properties): Use it. (cdef_class_rep::find_names): New signature. (cdef_class_rep::get_names): Use it. (cdef_class_rep::subsref_meta, cdef_class_rep::initialize_object, cdef_class_rep::run_constructor, cdef_class_rep::construct): New methods. (compute_attribute_value, attribute_to_string): New static functions. (cdef_class::make_meta_class): Change signature, non const argument. Implement it. (cdef_property_rep::get_value): Do not check access here. (cdef_property_rep::set_value, cdef_property_rep::is_recursive_set): New method. (cdef_property_rep::check_get_access, cdef_property_rep::check_set_access, cdef_method_rep::check_access): Use static check_access utility function. (install_classdef): Adapt to change of signature of make_class. Mark meta classes as sealed. Add HandleCompatible property to meta.class. Add DefaultValue and HasDefault properties to meta.property. * libinterp/parse-tree/pt-classdef.h (tree_classdef::make_meta_class): Change return type to (octave_function *). * libinterp/parse-tree/pt-classdef.cc (tree_classdef::make_meta_class): Likewise. Call cdef_class::get_constructor_function. * libinterp/parse-tree/oct-parse.yy (parse_fcn_file): Adapt to new signature of tree_classdef::make_meta_class. * libinterp/octave-value/ov-fcn.h (octave_function::is_classdef_constructor): New virtual method. * libinterp/octave-value/ov-usr-fcn.h (octave_user_function::class_ctor_type): New private enum. (octave_user_function::mark_as_class_constructor, octave_user_function::is_class_constructor): Use it. (octave_user_function::mark_as_classdef_constructor, octave_user_function::is_classdef_constructor): New methods. (octave_user_function::class_constructor): Turn into class_ctor_type. * libinterp/octave-value/of-usr-fcn.cc (octave_user_function::octave_user_function): Initialize class_constructor. (octave_user_function::do_multi_index_op): When function is a classdef constructor, extract the first argument and use it to populate the first output argument.

/*

Copyright (C) 1996-2012 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_function_h)
#define octave_function_h 1

#include <string>

#include "oct-time.h"
#include "str-vec.h"

#include "oct-alloc.h"
#include "oct-obj.h"
#include "ov-base.h"
#include "ov-typeinfo.h"
#include "symtab.h"

class tree_walker;

// Functions.

class
OCTINTERP_API
octave_function : public octave_base_value
{
public:

  octave_function (void)
    : relative (false), locked (false), private_function (false),
      xdispatch_class (), my_name (), my_dir_name (), doc () { }

  ~octave_function (void) { }

  octave_base_value *clone (void) const;
  octave_base_value *empty_clone (void) const;

  bool is_defined (void) const { return true; }

  bool is_function (void) const { return true; }

  virtual bool is_system_fcn_file (void) const { return false; }

  virtual std::string fcn_file_name (void) const { return std::string (); }

  virtual std::string src_file_name (void) const { return std::string (); }

  // The name to show in the profiler (also used as map-key).
  virtual std::string profiler_name (void) const { return name (); }

  virtual std::string parent_fcn_name (void) const { return std::string (); }

  virtual symbol_table::scope_id parent_fcn_scope (void) const { return -1; }

  virtual void mark_fcn_file_up_to_date (const octave_time&) { }

  virtual symbol_table::scope_id scope (void) { return -1; }

  virtual octave_time time_parsed (void) const
    { return octave_time (static_cast<time_t> (0)); }

  virtual octave_time time_checked (void) const
    { return octave_time (static_cast<time_t> (0)); }

  virtual bool is_subfunction (void) const { return false; }

  virtual bool is_class_constructor (const std::string& = std::string ()) const
    { return false; }

  virtual bool
  is_classdef_constructor (const std::string& = std::string ()) const
    { return false; }

  virtual bool is_class_method (const std::string& = std::string ()) const
    { return false; }

  virtual bool takes_varargs (void) const { return false; }

  virtual bool takes_var_return (void) const { return false; }

  void stash_dispatch_class (const std::string& nm) { xdispatch_class = nm; }

  std::string dispatch_class (void) const { return xdispatch_class; }

  virtual void
  mark_as_private_function (const std::string& cname = std::string ())
  {
    private_function = true;
    xdispatch_class = cname;
  }

  bool is_private_function (void) const { return private_function; }

  bool is_private_function_of_class (const std::string& nm) const
    { return private_function && xdispatch_class == nm; }

  virtual bool
  is_anonymous_function_of_class (const std::string& = std::string ()) const
    { return false; }

  std::string dir_name (void) const { return my_dir_name; }

  void stash_dir_name (const std::string& dir) { my_dir_name = dir; }

  void lock (void)
  {
    this->lock_subfunctions ();
    locked = true;
  }

  void unlock (void)
  {
    this->unlock_subfunctions ();
    locked = false;
  }

  bool islocked (void) const { return locked; }

  virtual void lock_subfunctions (void) { }

  virtual void unlock_subfunctions (void) { }

  void mark_relative (void) { relative = true; }

  bool is_relative (void) const { return relative; }

  std::string name (void) const { return my_name; }

  void document (const std::string& ds) { doc = ds; }

  std::string doc_string (void) const { return doc; }

  virtual void unload (void) { }

  virtual void accept (tree_walker&) { }

protected:

  octave_function (const std::string& nm,
                   const std::string& ds = std::string ())
    : relative (false), locked (false), private_function (false),
      xdispatch_class (), my_name (nm), my_dir_name (), doc (ds) { }

  // TRUE if this function was found from a relative path element.
  bool relative;

  // TRUE if this function is tagged so that it can't be cleared.
  bool locked;

  // TRUE means this is a private function.
  bool private_function;

  // If this object is a class method or constructor, or a private
  // function inside a class directory, this is the name of the class
  // to which the method belongs.
  std::string xdispatch_class;

  // The name of this function.
  std::string my_name;

  // The name of the directory in the path where we found this
  // function.  May be relative.
  std::string my_dir_name;

  // The help text for this function.
  std::string doc;

private:

  // No copying!

  octave_function (const octave_function& f);

  octave_function& operator = (const octave_function& f);

  DECLARE_OCTAVE_ALLOCATOR
};

#endif