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/>.

*/

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

#include <typeinfo>

#include "quit.h"

#include "defun.h"
#include "error.h"
#include "gripes.h"
#include "ov.h"
#include "oct-lvalue.h"
#include "input.h"
#include "pager.h"
#include "pt-bp.h"
#include "pt-cmd.h"
#include "pt-id.h"
#include "pt-idx.h"
#include "pt-jump.h"
#include "pt-pr-code.h"
#include "pt-stmt.h"
#include "pt-walk.h"
#include "unwind-prot.h"
#include "utils.h"
#include "variables.h"

// A list of commands to be executed.

tree_statement::~tree_statement (void)
{
  delete cmd;
  delete expr;
  delete comm;
}

void
tree_statement::set_print_flag (bool print_flag)
{
  if (expr)
    expr->set_print_flag (print_flag);
}

bool
tree_statement::print_result (void)
{
  return expr && expr->print_result ();
}

void
tree_statement::set_breakpoint (void)
{
  if (cmd)
    cmd->set_breakpoint ();
  else if (expr)
    expr->set_breakpoint ();
}

void
tree_statement::delete_breakpoint (void)
{
  if (cmd)
    cmd->delete_breakpoint ();
  else if (expr)
    expr->delete_breakpoint ();
}

bool
tree_statement::is_breakpoint (void) const
{
  return cmd ? cmd->is_breakpoint () : (expr ? expr->is_breakpoint () : false);
}

int
tree_statement::line (void) const
{
  return cmd ? cmd->line () : (expr ? expr->line () : -1);
}

int
tree_statement::column (void) const
{
  return cmd ? cmd->column () : (expr ? expr->column () : -1);
}

void
tree_statement::echo_code (void)
{
  tree_print_code tpc (octave_stdout, VPS4);

  accept (tpc);
}

bool
tree_statement::is_end_of_fcn_or_script (void) const
{
  bool retval = false;

  if (cmd)
    {
      tree_no_op_command *no_op_cmd
        = dynamic_cast<tree_no_op_command *> (cmd);

      if (no_op_cmd)
        retval = no_op_cmd->is_end_of_fcn_or_script ();
    }

  return retval;
}

tree_statement *
tree_statement::dup (symbol_table::scope_id scope,
                     symbol_table::context_id context) const
{
  tree_statement *new_stmt = new tree_statement ();

  new_stmt->cmd = cmd ? cmd->dup (scope, context) : 0;

  new_stmt->expr = expr ? expr->dup (scope, context) : 0;

  new_stmt->comm = comm ? comm->dup () : 0;

  return new_stmt;
}

void
tree_statement::accept (tree_walker& tw)
{
  tw.visit_statement (*this);
}

int
tree_statement_list::set_breakpoint (int line)
{
  tree_breakpoint tbp (line, tree_breakpoint::set);
  accept (tbp);

  return tbp.get_line ();
}

void
tree_statement_list::delete_breakpoint (int line)
{
  if (line < 0)
    {
      octave_value_list bp_lst = list_breakpoints ();

      int len = bp_lst.length ();

      for (int i = 0; i < len; i++)
        {
          tree_breakpoint tbp (i, tree_breakpoint::clear);
          accept (tbp);
        }
    }
  else
    {
      tree_breakpoint tbp (line, tree_breakpoint::clear);
      accept (tbp);
    }
}

octave_value_list
tree_statement_list::list_breakpoints (void)
{
  tree_breakpoint tbp (0, tree_breakpoint::list);
  accept (tbp);

  return tbp.get_list ();
}

tree_statement_list *
tree_statement_list::dup (symbol_table::scope_id scope,
                          symbol_table::context_id context) const
{
  tree_statement_list *new_list = new tree_statement_list ();

  new_list->function_body = function_body;

  for (const_iterator p = begin (); p != end (); p++)
    {
      const tree_statement *elt = *p;

      new_list->append (elt ? elt->dup (scope, context) : 0);
    }

  return new_list;
}

void
tree_statement_list::accept (tree_walker& tw)
{
  tw.visit_statement_list (*this);
}