Chris@16: /*
Chris@101:  *          Copyright Andrey Semashev 2007 - 2015.
Chris@16:  * Distributed under the Boost Software License, Version 1.0.
Chris@16:  *    (See accompanying file LICENSE_1_0.txt or copy at
Chris@16:  *          http://www.boost.org/LICENSE_1_0.txt)
Chris@16:  */
Chris@16: /*!
Chris@16:  * \file   support/spirit_classic.hpp
Chris@16:  * \author Andrey Semashev
Chris@16:  * \date   19.07.2009
Chris@16:  *
Chris@16:  * This header enables Boost.Spirit (classic) support for Boost.Log.
Chris@16:  */
Chris@16: 
Chris@16: #ifndef BOOST_LOG_SUPPORT_SPIRIT_CLASSIC_HPP_INCLUDED_
Chris@16: #define BOOST_LOG_SUPPORT_SPIRIT_CLASSIC_HPP_INCLUDED_
Chris@16: 
Chris@16: #include <boost/mpl/bool.hpp>
Chris@101: #include <boost/utility/enable_if.hpp>
Chris@16: #include <boost/log/detail/config.hpp>
Chris@16: #include <boost/log/utility/functional/matches.hpp>
Chris@16: 
Chris@16: #ifdef BOOST_HAS_PRAGMA_ONCE
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #if !defined(BOOST_LOG_NO_THREADS) && !defined(BOOST_SPIRIT_THREADSAFE) && !defined(BOOST_LOG_DOXYGEN_PASS)
Chris@16: /*
Chris@16:  * As Boost.Log filters may be called in multiple threads concurrently,
Chris@16:  * this may lead to using Boost.Spirit parsers in a multithreaded context.
Chris@16:  * In order to protect parsers properly, BOOST_SPIRIT_THREADSAFE macro should
Chris@16:  * be defined.
Chris@16:  *
Chris@16:  * If we got here, it means that the user did not define that macro and we
Chris@16:  * have to define it ourselves. However, it may also lead to ODR violations
Chris@16:  * or even total ignorance of this macro, if the user has included Boost.Spirit
Chris@16:  * headers before including this header, or uses Boost.Spirit without the macro
Chris@16:  * in other translation units. The only reliable way to settle this problem is to
Chris@16:  * define the macro for the whole project (i.e. all translation units).
Chris@16:  */
Chris@101: #if defined(__GNUC__)
Chris@101: #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."
Chris@101: #elif defined(_MSC_VER)
Chris@101: #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.")
Chris@101: #endif
Chris@16: #define BOOST_SPIRIT_THREADSAFE 1
Chris@16: #endif // !defined(BOOST_LOG_NO_THREADS) && !defined(BOOST_SPIRIT_THREADSAFE)
Chris@16: 
Chris@16: #include <boost/spirit/include/classic_parser.hpp>
Chris@16: 
Chris@16: #include <boost/log/detail/header.hpp>
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: BOOST_LOG_OPEN_NAMESPACE
Chris@16: 
Chris@16: namespace aux {
Chris@16: 
Chris@101: //! This tag type is used if an expression is recognized as a Boost.Spirit.Classic expression
Chris@101: struct boost_spirit_classic_expression_tag;
Chris@101: 
Chris@16: //! The trait verifies if the type can be converted to a Boost.Spirit (classic) parser
Chris@16: template< typename T >
Chris@101: struct is_spirit_classic_parser
Chris@16: {
Chris@16: private:
Chris@16:     typedef char yes_type;
Chris@16:     struct no_type { char dummy[2]; };
Chris@16: 
Chris@16:     template< typename U >
Chris@16:     static yes_type check_spirit_classic_parser(spirit::classic::parser< U > const&);
Chris@16:     static no_type check_spirit_classic_parser(...);
Chris@16:     static T& get_T();
Chris@16: 
Chris@16: public:
Chris@16:     enum { value = sizeof(check_spirit_classic_parser(get_T())) == sizeof(yes_type) };
Chris@16:     typedef mpl::bool_< value > type;
Chris@16: };
Chris@16: 
Chris@101: //! The metafunction detects the matching expression kind and returns a tag that is used to specialize \c match_traits
Chris@101: template< typename ExpressionT >
Chris@101: struct matching_expression_kind< ExpressionT, typename boost::enable_if_c< is_spirit_classic_parser< ExpressionT >::value >::type >
Chris@16: {
Chris@101:     typedef boost_spirit_classic_expression_tag type;
Chris@101: };
Chris@101: 
Chris@101: //! The matching function implementation
Chris@101: template< typename ExpressionT >
Chris@101: struct match_traits< ExpressionT, boost_spirit_classic_expression_tag >
Chris@101: {
Chris@101:     typedef ExpressionT compiled_type;
Chris@101:     static compiled_type compile(ExpressionT const& expr) { return expr; }
Chris@101: 
Chris@101:     template< typename StringT >
Chris@101:     static bool matches(StringT const& str, ExpressionT const& expr)
Chris@16:     {
Chris@16:         typedef typename StringT::const_iterator const_iterator;
Chris@16:         spirit::classic::parse_info< const_iterator > info =
Chris@16:             spirit::classic::parse(str.begin(), str.end(), expr);
Chris@16:         return info.full;
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: } // namespace aux
Chris@16: 
Chris@16: BOOST_LOG_CLOSE_NAMESPACE // namespace log
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #include <boost/log/detail/footer.hpp>
Chris@16: 
Chris@16: #endif // BOOST_LOG_SUPPORT_SPIRIT_CLASSIC_HPP_INCLUDED_