| /*============================================================================= |
| Copyright (c) 2001-2007 Joel de Guzman |
| |
| 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) |
| ==============================================================================*/ |
| #if !defined(BOOST_SPIRIT_META_GRAMMAR_FEB_07_2007_1100AM) |
| #define BOOST_SPIRIT_META_GRAMMAR_FEB_07_2007_1100AM |
| |
| #include <boost/spirit/home/qi/domain.hpp> |
| #include <boost/spirit/home/support/meta_grammar.hpp> |
| #include <boost/utility/enable_if.hpp> |
| |
| namespace boost { namespace spirit { namespace qi |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // forwards |
| /////////////////////////////////////////////////////////////////////////// |
| struct action; |
| struct main_meta_grammar; |
| |
| template <typename Expr, typename Enable> |
| struct is_valid_expr; |
| |
| template <typename Expr, typename Enable> |
| struct expr_transform; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // action meta-grammar |
| /////////////////////////////////////////////////////////////////////////// |
| struct action_meta_grammar : |
| meta_grammar::binary_rule< |
| qi::domain, proto::tag::subscript, action |
| , main_meta_grammar, proto::when<proto::_, proto::_child> |
| > |
| { |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // These specializations non-intrusively hooks into the RD meta-grammar. |
| // (see qi/meta_grammar.hpp) |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Expr> |
| struct is_valid_expr<Expr |
| , typename enable_if<proto::matches<Expr, action_meta_grammar> >::type> |
| : mpl::true_ |
| { |
| }; |
| |
| template <typename Expr> |
| struct expr_transform<Expr |
| , typename enable_if<proto::matches<Expr, action_meta_grammar> >::type> |
| : mpl::identity<action_meta_grammar> |
| { |
| }; |
| }}} |
| |
| #endif |