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#ifndef VARIABLES_H
#define VARIABLES_H

#include <boost/intrusive_ptr.hpp>
#include <boost/optional.hpp>
#include <glibmm/ustring.h>
#include <libxml++/nodes/element.h>
#include <libxml++/attribute.h>
#include "intrusivePtrBase.h"

class RowUser;

class VariableImpl : public virtual IntrusivePtrBase {
	public:
		virtual const Glib::ustring & value() const = 0;

	protected:
		VariableImpl(const Glib::ustring & src);
		VariableImpl(const Glib::ustring & src, boost::optional<Glib::ustring> def);
		virtual ~VariableImpl() = 0;

		const Glib::ustring source;
		Glib::ustring name;
		boost::optional<Glib::ustring> defaultValue;
};

class Variable {
	public:
		typedef boost::intrusive_ptr<VariableImpl> VariableImplPtr;

		Variable(const xmlpp::Attribute *);
		Variable(const xmlpp::Element *);
		Variable(const Glib::ustring & s);

		static Variable makeParent(const Glib::ustring & name, unsigned int depth);

		operator const Glib::ustring & () const { return var->value(); }
		const Glib::ustring & operator()() const { return var->value(); }
		const Glib::ustring * operator->() const { return &var->value(); }

	private:
		Variable(VariableImpl *);
		friend class VariableParse;
		static VariableImplPtr create(const Glib::ustring & s, RowUser * dep = NULL);
		VariableImplPtr var;
};

#endif