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- ///////////////////////////////////////////////////////////////////////////////
- // as_marker.hpp
- //
- // Copyright 2008 Eric Niebler. 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)
- #ifndef BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_MARKER_HPP_EAN_04_01_2007
- #define BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_MARKER_HPP_EAN_04_01_2007
- // MS compatible compilers support #pragma once
- #if defined(_MSC_VER)
- # pragma once
- #endif
- #include <boost/xpressive/detail/detail_fwd.hpp>
- #include <boost/xpressive/detail/static/static.hpp>
- #include <boost/proto/core.hpp>
- namespace boost { namespace xpressive { namespace grammar_detail
- {
- ///////////////////////////////////////////////////////////////////////////////
- // as_marker
- // Insert mark tags before and after the expression
- struct as_marker : proto::transform<as_marker>
- {
- template<typename Expr, typename State, typename Data>
- struct impl : proto::transform_impl<Expr, State, Data>
- {
- typedef
- typename shift_right<
- terminal<detail::mark_begin_matcher>::type
- , typename shift_right<
- typename proto::result_of::right<typename impl::expr>::type
- , terminal<detail::mark_end_matcher>::type
- >::type
- >::type
- result_type;
- result_type operator ()(
- typename impl::expr_param expr
- , typename impl::state_param
- , typename impl::data_param
- ) const
- {
- int mark_nbr = detail::get_mark_number(proto::left(expr));
- detail::mark_begin_matcher begin(mark_nbr);
- detail::mark_end_matcher end(mark_nbr);
- result_type that = {{begin}, {proto::right(expr), {end}}};
- return that;
- }
- };
- };
- }}}
- #endif
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