79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#if !defined(BOOST_SPIRIT_CALC8_ANNOTATION_HPP)
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#define BOOST_SPIRIT_CALC8_ANNOTATION_HPP
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#include <map>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/type_traits/is_base_of.hpp>
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#include <boost/mpl/bool.hpp>
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#include "ast.hpp"
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namespace client
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{
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///////////////////////////////////////////////////////////////////////////////
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// The annotation handler links the AST to a map of iterator positions
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// for the purpose of subsequent semantic error handling when the
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// program is being compiled.
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///////////////////////////////////////////////////////////////////////////////
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template <typename Iterator>
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struct annotation
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{
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template <typename, typename>
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struct result { typedef void type; };
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std::vector<Iterator>& iters;
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annotation(std::vector<Iterator>& iters)
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: iters(iters) {}
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struct set_id
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{
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typedef void result_type;
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int id;
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set_id(int id) : id(id) {}
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template <typename T>
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void operator()(T& x) const
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{
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this->dispatch(x, boost::is_base_of<ast::tagged, T>());
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}
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// This will catch all nodes except those inheriting from ast::tagged
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template <typename T>
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void dispatch(T& x, boost::mpl::false_) const
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{
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// (no-op) no need for tags
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}
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// This will catch all nodes inheriting from ast::tagged
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template <typename T>
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void dispatch(T& x, boost::mpl::true_) const
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{
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x.id = id;
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}
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};
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void operator()(ast::operand& ast, Iterator pos) const
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{
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int id = iters.size();
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iters.push_back(pos);
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boost::apply_visitor(set_id(id), ast);
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}
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void operator()(ast::assignment& ast, Iterator pos) const
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{
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int id = iters.size();
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iters.push_back(pos);
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ast.lhs.id = id;
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}
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};
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}
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#endif
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