/*
    Copyright (C) 2014 Carl Hetherington <cth@carlh.net>

    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 2 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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

/** @file  src/xml.h
 *  @brief Some useful XML helper functions.
 */

#ifndef LIBSUB_XML_H
#define LIBSUB_XML_H

#include "exceptions.h"
#include <libcxml/cxml.h>

namespace sub
{

template <class T>
boost::shared_ptr<T>
optional_type_child (cxml::Node const & node, std::string name)
{
	std::list<boost::shared_ptr<cxml::Node> > n = node.node_children (name);
	if (n.size() > 1) {
		throw XMLError ("duplicate XML tag");
	} else if (n.empty ()) {
		return boost::shared_ptr<T> ();
	}

	return boost::shared_ptr<T> (new T (n.front ()));
}

template <class T>
boost::shared_ptr<T> type_child (boost::shared_ptr<const cxml::Node> node, std::string name) {
	return boost::shared_ptr<T> (new T (node->node_child (name)));
}

template <class T>
boost::shared_ptr<T>
optional_type_child (boost::shared_ptr<const cxml::Node> node, std::string name)
{
	return optional_type_child<T> (*node.get(), name);
}

template <class T>
std::list<boost::shared_ptr<T> >
type_children (cxml::Node const & node, std::string name)
{
	std::list<boost::shared_ptr<cxml::Node> > n = node.node_children (name);
        std::list<boost::shared_ptr<T> > r;
        for (typename std::list<boost::shared_ptr<cxml::Node> >::iterator i = n.begin(); i != n.end(); ++i) {
		r.push_back (boost::shared_ptr<T> (new T (*i)));
	}
	return r;
}

template <class T>
std::list<boost::shared_ptr<T> >
type_children (boost::shared_ptr<const cxml::Node> node, std::string name)
{
	return type_children<T> (*node.get(), name);
}

template <class T>
std::list<boost::shared_ptr<T> >
type_grand_children (cxml::Node const & node, std::string name, std::string sub)
{
	boost::shared_ptr<const cxml::Node> p = node.node_child (name);
	return type_children<T> (p, sub);
}

template <class T>
std::list<boost::shared_ptr<T> >
type_grand_children (boost::shared_ptr<const cxml::Node> node, std::string name, std::string sub)
{
	return type_grand_children<T> (*node.get(), name, sub);
}

}

#endif