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//
// Copyright 2010 Ettus Research LLC
//
// This program 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.
//
// This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
//
#include <uhd/wax.hpp>
#include <boost/format.hpp>
#include <stdexcept>
/*!
* The link args for internal use within this cpp file:
*
* It contains a link (in this case a pointer) to a wax object.
* Only the methods in this file may create or parse link args.
* The get_link method is the creator of a link args object.
* The [] operator will resolve the link and make the [] call.
*
* TODO: register the link args with the wax obj that it links to.
* That way, if the obj destructs, the link can be invalidated.
* The operator() will throw, rather than dereferencing bad memory.
*/
class link_args_t{
public:
link_args_t(const wax::obj *obj_ptr) : _obj_ptr(obj_ptr){
/* NOP */
}
wax::obj & operator()(void) const{
//recursively resolve link args to get at original pointer
if (_obj_ptr->type() == typeid(link_args_t)){
return wax::cast<link_args_t>(*_obj_ptr)();
}
return *const_cast<wax::obj *>(_obj_ptr);
}
private:
const wax::obj *_obj_ptr;
};
/*!
* The proxy args for internal use within this cpp file:
*
* It contains a link and a key for setting/getting a property.
* Only the methods in this file may create or parse proxy args.
* Class methods have special handling for the case when the
* wax obj contains an instance of the proxy args.
*/
class proxy_args_t{
public:
proxy_args_t(const wax::obj *obj_ptr, const wax::obj &key) : _key(key){
_obj_link = obj_ptr->get_link();
}
wax::obj & operator()(void) const{
return wax::cast<link_args_t>(_obj_link)();
}
const wax::obj & key(void) const{
return _key;
}
private:
wax::obj _obj_link;
const wax::obj _key;
};
/***********************************************************************
* Structors
**********************************************************************/
wax::obj::obj(void){
/* NOP */
}
wax::obj::obj(const obj &o){
_contents = o._contents;
}
wax::obj::~obj(void){
/* NOP */
}
/***********************************************************************
* Special Operators
**********************************************************************/
wax::obj wax::obj::operator[](const obj &key){
if (_contents.type() == typeid(proxy_args_t)){
obj val = resolve();
//check if its a special link and call
if (val.type() == typeid(link_args_t)){
return cast<link_args_t>(val)()[key];
}
//unknown obj
throw std::runtime_error("cannot use [] on non wax::obj link");
}
else{
return proxy_args_t(this, key);
}
}
wax::obj & wax::obj::operator=(const obj &val){
if (_contents.type() == typeid(proxy_args_t)){
proxy_args_t proxy_args = boost::any_cast<proxy_args_t>(_contents);
proxy_args().set(proxy_args.key(), val);
}
else{
_contents = val._contents;
}
return *this;
}
/***********************************************************************
* Public Methods
**********************************************************************/
wax::obj wax::obj::get_link(void) const{
return link_args_t(this);
}
const std::type_info & wax::obj::type(void) const{
return resolve().type();
}
/***********************************************************************
* Private Methods
**********************************************************************/
boost::any wax::obj::resolve(void) const{
if (_contents.type() == typeid(proxy_args_t)){
obj val;
proxy_args_t proxy_args = boost::any_cast<proxy_args_t>(_contents);
proxy_args().get(proxy_args.key(), val);
return val.resolve();
}
else{
return _contents;
}
}
void wax::obj::get(const obj &, obj &){
throw std::runtime_error("Cannot call get on wax obj base class");
}
void wax::obj::set(const obj &, const obj &){
throw std::runtime_error("Cannot call set on wax obj base class");
}
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