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#ifndef VARIABLES_H
#define VARIABLES_H

#include <boost/shared_ptr.hpp>
#include <glibmm/ustring.h>
#include <libxml++/nodes/element.h>
#include <libxml++/attribute.h>

class RowUser;

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

	protected:
		VariableImpl(const Glib::ustring & src) : source(src) { }
		const Glib::ustring source;
};

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

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

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

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

#endif