| // Copyright (c) 2001-2007 Joel de Guzman |
| // Copyright (c) 2001-2009 Hartmut Kaiser |
| // |
| // 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_LEX_QI_META_GRAMMAR_NOV_18_2007_1144AM) |
| #define BOOST_SPIRIT_LEX_QI_META_GRAMMAR_NOV_18_2007_1144AM |
| |
| #if defined(_MSC_VER) && (_MSC_VER >= 1020) |
| #pragma once // MS compatible compilers support #pragma once |
| #endif |
| |
| #include <boost/spirit/home/qi/domain.hpp> |
| #include <boost/spirit/home/support/placeholders.hpp> |
| #include <boost/spirit/home/support/meta_grammar.hpp> |
| #include <boost/utility/enable_if.hpp> |
| #include <boost/mpl/bool.hpp> |
| |
| namespace boost { namespace spirit { namespace qi |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // forward declarations |
| /////////////////////////////////////////////////////////////////////////// |
| struct main_meta_grammar; |
| struct lexer_meta_grammar; |
| |
| struct state_switcher; |
| struct state_switcher_context; |
| |
| struct plain_token; |
| |
| template <typename Expr, typename Enable> |
| struct is_valid_expr; |
| |
| template <typename Expr, typename Enable> |
| struct expr_transform; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // main lexer_meta_grammar in the qi namespace |
| /////////////////////////////////////////////////////////////////////////// |
| struct lexer_meta_grammar |
| : proto::or_< |
| // lexer, lexer_def, token_def |
| meta_grammar::terminal_rule< |
| qi::domain, |
| lex::terminal_holder<proto::_, proto::_>, |
| lex::terminal_director |
| >, |
| // set_state("..."), set_state(str) |
| meta_grammar::terminal_rule< |
| qi::domain, tag::set_state_tag<proto::_>, state_switcher |
| >, |
| // in_state("...")[], in_state(str)[] |
| meta_grammar::subscript_rule< |
| qi::domain, in_state_tag<proto::_>, state_switcher_context, |
| main_meta_grammar |
| >, |
| // token(id) |
| meta_grammar::function1_rule< |
| qi::domain, tag::token, plain_token, |
| proto::terminal<proto::convertible_to<int> > |
| > |
| > |
| { |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // These specializations non-intrusively hook into the Qi meta-grammar. |
| // (see qi/meta_grammar.hpp) |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Expr> |
| struct is_valid_expr< |
| Expr, |
| typename enable_if< |
| proto::matches<Expr, lexer_meta_grammar> |
| >::type |
| > |
| : mpl::true_ |
| { |
| }; |
| |
| template <typename Expr> |
| struct expr_transform< |
| Expr, |
| typename enable_if< |
| proto::matches<Expr, lexer_meta_grammar> |
| >::type |
| > |
| : mpl::identity<lexer_meta_grammar> |
| { |
| }; |
| |
| }}} |
| |
| #endif |