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