135 lines
4.0 KiB
C++
Executable File
135 lines
4.0 KiB
C++
Executable File
// Copyright (c) 2001-2008 Hartmut Kaiser
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//
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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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#if !defined(BOOST_SPIRIT_META_GRAMMAR_MAY_05_2007_1230PM)
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#define BOOST_SPIRIT_META_GRAMMAR_MAY_05_2007_1230PM
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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#pragma once // MS compatible compilers support #pragma once
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#endif
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#include <boost/spirit/home/qi/domain.hpp>
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#include <boost/spirit/home/support/placeholders.hpp>
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#include <boost/spirit/home/support/meta_grammar.hpp>
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#include <boost/utility/enable_if.hpp>
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namespace boost { namespace spirit
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{
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namespace qi
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{
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template <typename T, typename Char>
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struct stream_tag;
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}
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template <typename T, typename Char>
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struct is_stream_tag<qi::stream_tag<T, Char>, qi::domain>
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: mpl::true_ {};
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}}
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namespace boost { namespace spirit { namespace qi
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{
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///////////////////////////////////////////////////////////////////////////
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// forwards
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///////////////////////////////////////////////////////////////////////////
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template <typename Char, typename T>
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struct any_stream;
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template <typename Char>
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struct stream_director;
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struct main_meta_grammar;
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template <typename Expr, typename Enable>
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struct is_valid_expr;
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template <typename Expr, typename Enable>
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struct expr_transform;
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///////////////////////////////////////////////////////////////////////////
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// stream tag
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///////////////////////////////////////////////////////////////////////////
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template <typename T, typename Char>
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struct stream_tag
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{
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};
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///////////////////////////////////////////////////////////////////////////
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// stream specs
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///////////////////////////////////////////////////////////////////////////
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template <typename T, typename Char = char>
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struct typed_stream
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: proto::terminal<stream_tag<T, Char> >::type
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{
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};
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///////////////////////////////////////////////////////////////////////////
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// get the director for a stream
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///////////////////////////////////////////////////////////////////////////
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template <typename Tag>
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struct extract_stream_director;
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template <>
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struct extract_stream_director<tag::stream>
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{
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typedef any_stream<char> type;
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};
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template <>
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struct extract_stream_director<tag::wstream>
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{
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typedef any_stream<wchar_t> type;
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};
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template <typename T, typename Char>
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struct extract_stream_director<stream_tag<T, Char> >
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{
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typedef any_stream<Char, T> type;
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};
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///////////////////////////////////////////////////////////////////////////
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// utility meta-grammar
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///////////////////////////////////////////////////////////////////////////
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struct utility_meta_grammar :
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// stream, wstream
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meta_grammar::compose_empty<
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proto::if_<
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is_stream_tag<proto::_arg, qi::domain>()
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>,
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qi::domain,
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mpl::identity<extract_stream_director<mpl::_> >
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>
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{
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};
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///////////////////////////////////////////////////////////////////////////
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// These specializations non-intrusively hooks into the Qi meta-grammar.
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// (see qi/meta_grammar.hpp)
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///////////////////////////////////////////////////////////////////////////
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template <typename Expr>
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struct is_valid_expr<
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Expr,
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typename enable_if<
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proto::matches<Expr, utility_meta_grammar>
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>::type
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>
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: mpl::true_
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{
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};
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template <typename Expr>
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struct expr_transform<
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Expr,
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typename enable_if<
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proto::matches<Expr, utility_meta_grammar>
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>::type
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>
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: mpl::identity<utility_meta_grammar>
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{
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};
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}}}
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#endif
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