#ifndef SCOPE_H
#define SCOPE_H

#include <list>
#include <map>
#include <string>

class Scope
{
    public:
        Scope() { push(); }
        bool contains(const std::string & key)
        {
            for (m_list_type::const_reverse_iterator it = m_list.rbegin();
                 it != m_list.rend();
                 it++)
            {
                if (it->find(key) != it->end())
                {
                    return true;
                }
            }
            return false;
        }
        double & operator[](const std::string & key)
        {
            for (m_list_type::reverse_iterator it = m_list.rbegin();
                 it != m_list.rend();
                 it++)
            {
                if (it->find(key) != it->end())
                {
                    return (*it)[key];
                }
            }
            return (*m_list.rbegin())[key];
        }
        void push()
        {
            m_list.push_back(std::map< std::string, double >());
        }
        void pop()
        {
            if (m_list.size() > 1)
            {
                m_list.pop_back();
            }
        }
    protected:
        typedef std::list< std::map< std::string, double > > m_list_type;
        m_list_type m_list;
};

#endif