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) 2003-2012 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/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <iostream>

#include "error.h"
#include "oct-obj.h"
#include "ov-fcn-handle.h"
#include "pt-fcn-handle.h"
#include "pager.h"
#include "pt-const.h"
#include "pt-walk.h"
#include "variables.h"

void
tree_fcn_handle::print (std::ostream& os, bool pr_as_read_syntax,
                        bool pr_orig_text)
{
  print_raw (os, pr_as_read_syntax, pr_orig_text);
}

void
tree_fcn_handle::print_raw (std::ostream& os, bool pr_as_read_syntax,
                            bool pr_orig_text)
{
  os << ((pr_as_read_syntax || pr_orig_text) ? "@" : "") << nm;
}

octave_value
tree_fcn_handle::rvalue1 (int)
{
  return make_fcn_handle (nm);
}

octave_value_list
tree_fcn_handle::rvalue (int nargout)
{
  octave_value_list retval;

  if (nargout > 1)
    error ("invalid number of output arguments for function handle expression");
  else
    retval = rvalue1 (nargout);

  return retval;
}

tree_expression *
tree_fcn_handle::dup (symbol_table::scope_id,
                      symbol_table::context_id) const
{
  tree_fcn_handle *new_fh = new tree_fcn_handle (nm, line (), column ());

  new_fh->copy_base (*this);

  return new_fh;
}

void
tree_fcn_handle::accept (tree_walker& tw)
{
  tw.visit_fcn_handle (*this);
}

octave_value
tree_anon_fcn_handle::rvalue1 (int)
{
  // FIXME -- should CMD_LIST be limited to a single expression?
  // I think that is what Matlab does.

  tree_parameter_list *param_list = parameter_list ();
  tree_parameter_list *ret_list = return_list ();
  tree_statement_list *cmd_list = body ();
  symbol_table::scope_id this_scope = scope ();

  symbol_table::scope_id new_scope = symbol_table::dup_scope (this_scope);

  if (new_scope > 0)
    symbol_table::inherit (new_scope, symbol_table::current_scope (),
                           symbol_table::current_context ());

  octave_user_function *uf
    = new octave_user_function (new_scope,
                                param_list ? param_list->dup (new_scope, 0) : 0,
                                ret_list ? ret_list->dup (new_scope, 0) : 0,
                                cmd_list ? cmd_list->dup (new_scope, 0) : 0);

  octave_function *curr_fcn = octave_call_stack::current ();

  if (curr_fcn)
    {
      // FIXME -- maybe it would be better to just stash curr_fcn
      // instead of individual bits of info about it?

      uf->stash_parent_fcn_name (curr_fcn->name ());
      uf->stash_dir_name (curr_fcn->dir_name ());

      symbol_table::scope_id parent_scope = curr_fcn->parent_fcn_scope ();

      if (parent_scope < 0)
        parent_scope = curr_fcn->scope ();

      uf->stash_parent_fcn_scope (parent_scope);

      if (curr_fcn->is_class_method () || curr_fcn->is_class_constructor ())
        uf->stash_dispatch_class (curr_fcn->dispatch_class ());
    }

  uf->mark_as_anonymous_function ();
  uf->stash_fcn_file_name (file_name);
  uf->stash_fcn_location (line (), column ());

  octave_value ov_fcn (uf);

  octave_value fh (octave_fcn_binder::maybe_binder (ov_fcn));

  return fh;
}

/*
%!function r = __f2 (f, x)
%!  r = f (x);
%!endfunction
%!function f = __f1 (k)
%!  f = @(x) __f2 (@(y) y-k, x);
%!endfunction

%!assert ((__f1 (3)) (10) == 7)

%!test
%! g = @(t) feval (@(x) t*x, 2);
%! assert (g(0.5) == 1);

%!test
%! h = @(x) sin (x);
%! g = @(f, x) h (x);
%! f = @() g (@(x) h, pi);
%! assert (f () == sin (pi));
*/

octave_value_list
tree_anon_fcn_handle::rvalue (int nargout)
{
  octave_value_list retval;

  if (nargout > 1)
    error ("invalid number of output arguments for anonymous function handle expression");
  else
    retval = rvalue1 (nargout);

  return retval;
}

tree_expression *
tree_anon_fcn_handle::dup (symbol_table::scope_id,
                           symbol_table::context_id) const
{
  tree_parameter_list *param_list = parameter_list ();
  tree_parameter_list *ret_list = return_list ();
  tree_statement_list *cmd_list = body ();
  symbol_table::scope_id this_scope = scope ();

  symbol_table::scope_id new_scope = symbol_table::dup_scope (this_scope);

  if (new_scope > 0)
    symbol_table::inherit (new_scope, symbol_table::current_scope (),
                           symbol_table::current_context ());

  tree_anon_fcn_handle *new_afh = new
    tree_anon_fcn_handle (param_list ? param_list->dup (new_scope, 0) : 0,
                          ret_list ? ret_list->dup (new_scope, 0) : 0,
                          cmd_list ? cmd_list->dup (new_scope, 0) : 0,
                          new_scope, line (), column ());

  new_afh->copy_base (*this);

  return new_afh;
}

void
tree_anon_fcn_handle::accept (tree_walker& tw)
{
  tw.visit_anon_fcn_handle (*this);
}