boost/log/support/spirit_classic.hpp
/* * Copyright Andrey Semashev 2007 - 2015. * 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) */ /*! * \file support/spirit_classic.hpp * \author Andrey Semashev * \date 19.07.2009 * * This header enables Boost.Spirit (classic) support for Boost.Log. */ #ifndef BOOST_LOG_SUPPORT_SPIRIT_CLASSIC_HPP_INCLUDED_ #define BOOST_LOG_SUPPORT_SPIRIT_CLASSIC_HPP_INCLUDED_ #include <boost/mpl/bool.hpp> #include <boost/core/enable_if.hpp> #include <boost/log/detail/config.hpp> #include <boost/log/utility/functional/matches.hpp> #ifdef BOOST_HAS_PRAGMA_ONCE #pragma once #endif #if !defined(BOOST_LOG_NO_THREADS) && !defined(BOOST_SPIRIT_THREADSAFE) && !defined(BOOST_LOG_DOXYGEN_PASS) /* * As Boost.Log filters may be called in multiple threads concurrently, * this may lead to using Boost.Spirit parsers in a multithreaded context. * In order to protect parsers properly, BOOST_SPIRIT_THREADSAFE macro should * be defined. * * If we got here, it means that the user did not define that macro and we * have to define it ourselves. However, it may also lead to ODR violations * or even total ignorance of this macro, if the user has included Boost.Spirit * headers before including this header, or uses Boost.Spirit without the macro * in other translation units. The only reliable way to settle this problem is to * define the macro for the whole project (i.e. all translation units). */ #if defined(__GNUC__) #pragma message "Boost.Log: Boost.Spirit requires BOOST_SPIRIT_THREADSAFE macro to be defined if parsers are used in a multithreaded context. It is strongly recommended to define this macro project-wide." #elif defined(_MSC_VER) #pragma message("Boost.Log: Boost.Spirit requires BOOST_SPIRIT_THREADSAFE macro to be defined if parsers are used in a multithreaded context. It is strongly recommended to define this macro project-wide.") #endif #define BOOST_SPIRIT_THREADSAFE 1 #endif // !defined(BOOST_LOG_NO_THREADS) && !defined(BOOST_SPIRIT_THREADSAFE) #include <boost/spirit/include/classic_parser.hpp> #include <boost/log/detail/header.hpp> namespace boost { BOOST_LOG_OPEN_NAMESPACE namespace aux { //! This tag type is used if an expression is recognized as a Boost.Spirit.Classic expression struct boost_spirit_classic_expression_tag; //! The trait verifies if the type can be converted to a Boost.Spirit (classic) parser template< typename T > struct is_spirit_classic_parser { private: typedef char yes_type; struct no_type { char dummy[2]; }; template< typename U > static yes_type check_spirit_classic_parser(spirit::classic::parser< U > const&); static no_type check_spirit_classic_parser(...); static T& get_T(); public: enum { value = sizeof(check_spirit_classic_parser(get_T())) == sizeof(yes_type) }; typedef mpl::bool_< value > type; }; //! The metafunction detects the matching expression kind and returns a tag that is used to specialize \c match_traits template< typename ExpressionT > struct matching_expression_kind< ExpressionT, typename boost::enable_if_c< is_spirit_classic_parser< ExpressionT >::value >::type > { typedef boost_spirit_classic_expression_tag type; }; //! The matching function implementation template< typename ExpressionT > struct match_traits< ExpressionT, boost_spirit_classic_expression_tag > { typedef ExpressionT compiled_type; static compiled_type compile(ExpressionT const& expr) { return expr; } template< typename StringT > static bool matches(StringT const& str, ExpressionT const& expr) { typedef typename StringT::const_iterator const_iterator; spirit::classic::parse_info< const_iterator > info = spirit::classic::parse(str.begin(), str.end(), expr); return info.full; } }; } // namespace aux BOOST_LOG_CLOSE_NAMESPACE // namespace log } // namespace boost #include <boost/log/detail/footer.hpp> #endif // BOOST_LOG_SUPPORT_SPIRIT_CLASSIC_HPP_INCLUDED_