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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(BOOST_SPIRIT_CALC8_ANNOTATION_HPP)
- #define BOOST_SPIRIT_CALC8_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, 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) {}
- template <typename T>
- void operator()(T& x) const
- {
- this->dispatch(x, boost::is_base_of<ast::tagged, T>());
- }
- // This will catch all nodes except those inheriting from ast::tagged
- template <typename T>
- void dispatch(T& x, boost::mpl::false_) const
- {
- // (no-op) no need for tags
- }
- // This will catch all nodes inheriting from ast::tagged
- template <typename T>
- void dispatch(T& x, boost::mpl::true_) const
- {
- x.id = id;
- }
- };
- 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::assignment& ast, Iterator pos) const
- {
- int id = iters.size();
- iters.push_back(pos);
- ast.lhs.id = id;
- }
- };
- }
- #endif
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