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/*
* Copyright Andrey Semashev 2007 - 2014.
* 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/utility/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_
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