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59 lines
2.0 KiB
59 lines
2.0 KiB
///////////////////////////////////////////////////////////////////////////////
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// as_marker.hpp
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_MARKER_HPP_EAN_04_01_2007
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#define BOOST_XPRESSIVE_DETAIL_STATIC_TRANSFORMS_AS_MARKER_HPP_EAN_04_01_2007
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/static/static.hpp>
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#include <boost/proto/core.hpp>
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namespace boost { namespace xpressive { namespace grammar_detail
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{
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///////////////////////////////////////////////////////////////////////////////
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// as_marker
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// Insert mark tags before and after the expression
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struct as_marker : proto::transform<as_marker>
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{
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template<typename Expr, typename State, typename Data>
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struct impl : proto::transform_impl<Expr, State, Data>
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{
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typedef
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typename shift_right<
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terminal<detail::mark_begin_matcher>::type
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, typename shift_right<
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typename proto::result_of::right<typename impl::expr>::type
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, terminal<detail::mark_end_matcher>::type
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>::type
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>::type
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result_type;
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result_type operator ()(
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typename impl::expr_param expr
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, typename impl::state_param
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, typename impl::data_param
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) const
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{
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int mark_nbr = detail::get_mark_number(proto::left(expr));
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detail::mark_begin_matcher begin(mark_nbr);
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detail::mark_end_matcher end(mark_nbr);
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result_type that = {{begin}, {proto::right(expr), {end}}};
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return that;
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}
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};
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};
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}}}
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#endif
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