/////////////////////////////////////////////////////////////////////////////// | |
// 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) && (_MSC_VER >= 1020) | |
# 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 |