annotation.hpp

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/*=============================================================================
    Copyright (c) 2001-2011 Joel de Guzman
 
    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#if !defined(ANNOTATION_HPP)
#define ANNOTATION_HPP
 
#include <map>
#include <boost/variant/apply_visitor.hpp>
#include <boost/type_traits/is_base_of.hpp>
#include <boost/mpl/bool.hpp>
#include "ast.hpp"
 
namespace client
{
    //  The annotation handler links the AST to a map of iterator positions
    //  for the purpose of subsequent semantic error handling when the
    //  program is being compiled.
    template <typename Iterator>
    struct annotation
    {
        template <typename>
        struct result { typedef void type; };
 
        std::vector<Iterator>& iters;
        annotation(std::vector<Iterator>& iters)
          : iters(iters) {}
 
        struct set_id
        {
            typedef void result_type;
 
            int id;
            set_id(int id) : id(id) {}
 
            void operator()(ast::function_call& x) const
            {
                x.function_name.id = id;
            }
 
            void operator()(ast::identifier& x) const
            {
                x.id = id;
            }
 
            template <typename T>
            void operator()(T& /*x*/) const
            {
                // no-op
            }
        };
 
        void operator()(ast::operand& ast, Iterator pos) const
        {
            int id = iters.size();
            iters.push_back(pos);
            boost::apply_visitor(set_id(id), ast);
        }
 
        void operator()(ast::identifier& ast, Iterator pos) const
        {
            int id = iters.size();
            iters.push_back(pos);
            ast.id = id;
        }
    };
}
 
#endif