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- /*
- * 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 formatters/named_scope.hpp
- * \author Andrey Semashev
- * \date 11.11.2012
- *
- * The header contains a formatter function for named scope attribute values.
- */
- #ifndef BOOST_LOG_EXPRESSIONS_FORMATTERS_NAMED_SCOPE_HPP_INCLUDED_
- #define BOOST_LOG_EXPRESSIONS_FORMATTERS_NAMED_SCOPE_HPP_INCLUDED_
- #include <string>
- #include <iterator>
- #include <utility>
- #include <boost/static_assert.hpp>
- #include <boost/type_traits/is_same.hpp>
- #include <boost/move/core.hpp>
- #include <boost/move/utility_core.hpp>
- #include <boost/parameter/binding.hpp>
- #include <boost/preprocessor/iteration/iterate.hpp>
- #include <boost/preprocessor/repetition/enum_params.hpp>
- #include <boost/preprocessor/repetition/enum_binary_params.hpp>
- #include <boost/phoenix/core/actor.hpp>
- #include <boost/phoenix/core/terminal_fwd.hpp>
- #include <boost/phoenix/core/is_nullary.hpp>
- #include <boost/phoenix/core/environment.hpp>
- #include <boost/fusion/sequence/intrinsic/at_c.hpp>
- #include <boost/log/detail/config.hpp>
- #include <boost/log/attributes/attribute_name.hpp>
- #include <boost/log/attributes/fallback_policy.hpp>
- #include <boost/log/attributes/named_scope.hpp>
- #include <boost/log/attributes/value_visitation.hpp>
- #include <boost/log/detail/light_function.hpp>
- #include <boost/log/detail/parameter_tools.hpp>
- #include <boost/log/detail/custom_terminal_spec.hpp>
- #include <boost/log/detail/deduce_char_type.hpp>
- #include <boost/log/detail/attr_output_terminal.hpp>
- #include <boost/log/expressions/attr_fwd.hpp>
- #include <boost/log/expressions/keyword_fwd.hpp>
- #include <boost/log/utility/formatting_ostream.hpp>
- #include <boost/log/utility/string_literal_fwd.hpp>
- #include <boost/log/utility/functional/bind.hpp>
- #include <boost/log/keywords/format.hpp>
- #include <boost/log/keywords/delimiter.hpp>
- #include <boost/log/keywords/depth.hpp>
- #include <boost/log/keywords/iteration.hpp>
- #include <boost/log/keywords/empty_marker.hpp>
- #include <boost/log/keywords/incomplete_marker.hpp>
- #include <boost/log/detail/header.hpp>
- #ifdef BOOST_HAS_PRAGMA_ONCE
- #pragma once
- #endif
- namespace boost {
- BOOST_LOG_OPEN_NAMESPACE
- namespace expressions {
- //! Scope iteration directions
- enum scope_iteration_direction
- {
- forward, //!< Iterate through scopes from outermost to innermost
- reverse //!< Iterate through scopes from innermost to outermost
- };
- namespace aux {
- #ifdef BOOST_LOG_USE_CHAR
- //! Parses the named scope format string and constructs the formatter function
- BOOST_LOG_API boost::log::aux::light_function< void (basic_formatting_ostream< char >&, attributes::named_scope::value_type::value_type const&) >
- parse_named_scope_format(const char* begin, const char* end);
- #endif
- #ifdef BOOST_LOG_USE_WCHAR_T
- //! Parses the named scope format string and constructs the formatter function
- BOOST_LOG_API boost::log::aux::light_function< void (basic_formatting_ostream< wchar_t >&, attributes::named_scope::value_type::value_type const&) >
- parse_named_scope_format(const wchar_t* begin, const wchar_t* end);
- #endif
- //! Parses the named scope format string and constructs the formatter function
- template< typename CharT >
- inline boost::log::aux::light_function< void (basic_formatting_ostream< CharT >&, attributes::named_scope::value_type::value_type const&) >
- parse_named_scope_format(const CharT* format)
- {
- return parse_named_scope_format(format, format + std::char_traits< CharT >::length(format));
- }
- //! Parses the named scope format string and constructs the formatter function
- template< typename CharT, typename TraitsT, typename AllocatorT >
- inline boost::log::aux::light_function< void (basic_formatting_ostream< CharT >&, attributes::named_scope::value_type::value_type const&) >
- parse_named_scope_format(std::basic_string< CharT, TraitsT, AllocatorT > const& format)
- {
- const CharT* p = format.c_str();
- return parse_named_scope_format(p, p + format.size());
- }
- //! Parses the named scope format string and constructs the formatter function
- template< typename CharT, typename TraitsT >
- inline boost::log::aux::light_function< void (basic_formatting_ostream< CharT >&, attributes::named_scope::value_type::value_type const&) >
- parse_named_scope_format(basic_string_literal< CharT, TraitsT > const& format)
- {
- const CharT* p = format.c_str();
- return parse_named_scope_format(p, p + format.size());
- }
- template< typename CharT >
- class format_named_scope_impl
- {
- public:
- //! Function result type
- typedef void result_type;
- //! Character type
- typedef CharT char_type;
- //! String type
- typedef std::basic_string< char_type > string_type;
- //! Formatting stream type
- typedef basic_formatting_ostream< char_type > stream_type;
- //! Attribute value type
- typedef attributes::named_scope::value_type value_type;
- //! Named scope formatter
- typedef boost::log::aux::light_function< void (stream_type&, value_type::value_type const&) > element_formatter_type;
- private:
- //! Element formatting function
- element_formatter_type m_element_formatter;
- //! Element delimiter
- string_type m_delimiter;
- //! Incomplete list marker
- string_type m_incomplete_marker;
- //! Empty list marker
- string_type m_empty_marker;
- //! Maximum number of elements to output
- value_type::size_type m_depth;
- //! Iteration direction
- scope_iteration_direction m_direction;
- public:
- //! Initializing constructor
- format_named_scope_impl
- (
- element_formatter_type const& element_formatter,
- string_type const& delimiter,
- string_type const& incomplete_marker,
- string_type const& empty_marker,
- value_type::size_type depth,
- scope_iteration_direction direction
- ) :
- m_element_formatter(element_formatter),
- m_delimiter(delimiter),
- m_incomplete_marker(incomplete_marker),
- m_empty_marker(empty_marker),
- m_depth(depth),
- m_direction(direction)
- {
- }
- //! Copy constructor
- format_named_scope_impl(format_named_scope_impl const& that) :
- m_element_formatter(that.m_element_formatter),
- m_delimiter(that.m_delimiter),
- m_incomplete_marker(that.m_incomplete_marker),
- m_empty_marker(that.m_empty_marker),
- m_depth(that.m_depth),
- m_direction(that.m_direction)
- {
- }
- //! Formatting operator
- result_type operator() (stream_type& strm, value_type const& scopes) const
- {
- if (!scopes.empty())
- {
- if (m_direction == expressions::forward)
- format_forward(strm, scopes);
- else
- format_reverse(strm, scopes);
- }
- else
- {
- strm << m_empty_marker;
- }
- }
- private:
- //! The function performs formatting of the extracted scope stack in forward direction
- void format_forward(stream_type& strm, value_type const& scopes) const
- {
- value_type::const_iterator it, end = scopes.end();
- if (m_depth > 0)
- {
- value_type::size_type const scopes_to_iterate = (std::min)(m_depth, scopes.size());
- it = scopes.end();
- std::advance(it, -static_cast< value_type::difference_type >(scopes_to_iterate));
- }
- else
- {
- it = scopes.begin();
- }
- if (it != end)
- {
- if (it != scopes.begin())
- strm << m_incomplete_marker;
- m_element_formatter(strm, *it);
- for (++it; it != end; ++it)
- {
- strm << m_delimiter;
- m_element_formatter(strm, *it);
- }
- }
- }
- //! The function performs formatting of the extracted scope stack in reverse direction
- void format_reverse(stream_type& strm, value_type const& scopes) const
- {
- value_type::const_reverse_iterator it = scopes.rbegin(), end;
- if (m_depth > 0)
- {
- value_type::size_type const scopes_to_iterate = (std::min)(m_depth, scopes.size());
- end = it;
- std::advance(end, static_cast< value_type::difference_type >(scopes_to_iterate));
- }
- else
- {
- end = scopes.rend();
- }
- if (it != end)
- {
- m_element_formatter(strm, *it);
- for (++it; it != end; ++it)
- {
- strm << m_delimiter;
- m_element_formatter(strm, *it);
- }
- if (it != scopes.rend())
- strm << m_incomplete_marker;
- }
- }
- };
- } // namespace aux
- /*!
- * Named scope formatter terminal.
- */
- template< typename FallbackPolicyT, typename CharT >
- class format_named_scope_terminal
- {
- public:
- #ifndef BOOST_LOG_DOXYGEN_PASS
- //! Internal typedef for type categorization
- typedef void _is_boost_log_terminal;
- #endif
- //! Attribute value type
- typedef attributes::named_scope::value_type value_type;
- //! Fallback policy
- typedef FallbackPolicyT fallback_policy;
- //! Character type
- typedef CharT char_type;
- //! String type
- typedef std::basic_string< char_type > string_type;
- //! Formatting stream type
- typedef basic_formatting_ostream< char_type > stream_type;
- //! Formatter function
- typedef aux::format_named_scope_impl< char_type > formatter_function_type;
- //! Function result type
- typedef string_type result_type;
- private:
- //! Attribute value visitor invoker
- typedef value_visitor_invoker< value_type, fallback_policy > visitor_invoker_type;
- private:
- //! Attribute name
- attribute_name m_name;
- //! Formatter function
- formatter_function_type m_formatter;
- //! Attribute value visitor invoker
- visitor_invoker_type m_visitor_invoker;
- public:
- //! Initializing constructor
- template< typename FormatT >
- format_named_scope_terminal
- (
- attribute_name const& name,
- fallback_policy const& fallback,
- FormatT const& element_format,
- string_type const& delimiter,
- string_type const& incomplete_marker,
- string_type const& empty_marker,
- value_type::size_type depth,
- scope_iteration_direction direction
- ) :
- m_name(name), m_formatter(aux::parse_named_scope_format(element_format), delimiter, incomplete_marker, empty_marker, depth, direction), m_visitor_invoker(fallback)
- {
- }
- //! Copy constructor
- format_named_scope_terminal(format_named_scope_terminal const& that) :
- m_name(that.m_name), m_formatter(that.m_formatter), m_visitor_invoker(that.m_visitor_invoker)
- {
- }
- //! Returns attribute name
- attribute_name get_name() const
- {
- return m_name;
- }
- //! Returns fallback policy
- fallback_policy const& get_fallback_policy() const
- {
- return m_visitor_invoker.get_fallback_policy();
- }
- //! Retruns formatter function
- formatter_function_type const& get_formatter_function() const
- {
- return m_formatter;
- }
- //! Invokation operator
- template< typename ContextT >
- result_type operator() (ContextT const& ctx)
- {
- string_type str;
- stream_type strm(str);
- m_visitor_invoker(m_name, fusion::at_c< 0 >(phoenix::env(ctx).args()), binder1st< formatter_function_type&, stream_type& >(m_formatter, strm));
- strm.flush();
- return BOOST_LOG_NRVO_RESULT(str);
- }
- //! Invokation operator
- template< typename ContextT >
- result_type operator() (ContextT const& ctx) const
- {
- string_type str;
- stream_type strm(str);
- m_visitor_invoker(m_name, fusion::at_c< 0 >(phoenix::env(ctx).args()), binder1st< formatter_function_type const&, stream_type& >(m_formatter, strm));
- strm.flush();
- return BOOST_LOG_NRVO_RESULT(str);
- }
- BOOST_DELETED_FUNCTION(format_named_scope_terminal())
- };
- /*!
- * Named scope formatter actor.
- */
- template< typename FallbackPolicyT, typename CharT, template< typename > class ActorT = phoenix::actor >
- class format_named_scope_actor :
- public ActorT< format_named_scope_terminal< FallbackPolicyT, CharT > >
- {
- public:
- //! Character type
- typedef CharT char_type;
- //! Fallback policy
- typedef FallbackPolicyT fallback_policy;
- //! Base terminal type
- typedef format_named_scope_terminal< fallback_policy, char_type > terminal_type;
- //! Attribute value type
- typedef typename terminal_type::value_type value_type;
- //! Formatter function
- typedef typename terminal_type::formatter_function_type formatter_function_type;
- //! Base actor type
- typedef ActorT< terminal_type > base_type;
- public:
- //! Initializing constructor
- explicit format_named_scope_actor(base_type const& act) : base_type(act)
- {
- }
- /*!
- * \returns The attribute name
- */
- attribute_name get_name() const
- {
- return this->proto_expr_.child0.get_name();
- }
- /*!
- * \returns Fallback policy
- */
- fallback_policy const& get_fallback_policy() const
- {
- return this->proto_expr_.child0.get_fallback_policy();
- }
- /*!
- * \returns Formatter function
- */
- formatter_function_type const& get_formatter_function() const
- {
- return this->proto_expr_.child0.get_formatter_function();
- }
- };
- #ifndef BOOST_LOG_DOXYGEN_PASS
- #define BOOST_LOG_AUX_OVERLOAD(left_ref, right_ref)\
- template< typename LeftExprT, typename FallbackPolicyT, typename CharT >\
- BOOST_FORCEINLINE phoenix::actor< aux::attribute_output_terminal< phoenix::actor< LeftExprT >, attributes::named_scope::value_type, FallbackPolicyT, typename format_named_scope_actor< FallbackPolicyT, CharT >::formatter_function_type > >\
- operator<< (phoenix::actor< LeftExprT > left_ref left, format_named_scope_actor< FallbackPolicyT, CharT > right_ref right)\
- {\
- typedef aux::attribute_output_terminal< phoenix::actor< LeftExprT >, attributes::named_scope::value_type, FallbackPolicyT, typename format_named_scope_actor< FallbackPolicyT, CharT >::formatter_function_type > terminal_type;\
- phoenix::actor< terminal_type > actor = {{ terminal_type(left, right.get_name(), right.get_formatter_function(), right.get_fallback_policy()) }};\
- return actor;\
- }
- #include <boost/log/detail/generate_overloads.hpp>
- #undef BOOST_LOG_AUX_OVERLOAD
- #endif // BOOST_LOG_DOXYGEN_PASS
- namespace aux {
- //! Auxiliary traits to acquire default formatter parameters depending on the character type
- template< typename CharT >
- struct default_named_scope_params;
- #ifdef BOOST_LOG_USE_CHAR
- template< >
- struct default_named_scope_params< char >
- {
- static const char* forward_delimiter() { return "->"; }
- static const char* reverse_delimiter() { return "<-"; }
- static const char* incomplete_marker() { return "..."; }
- static const char* empty_marker() { return ""; }
- };
- #endif
- #ifdef BOOST_LOG_USE_WCHAR_T
- template< >
- struct default_named_scope_params< wchar_t >
- {
- static const wchar_t* forward_delimiter() { return L"->"; }
- static const wchar_t* reverse_delimiter() { return L"<-"; }
- static const wchar_t* incomplete_marker() { return L"..."; }
- static const wchar_t* empty_marker() { return L""; }
- };
- #endif
- template< typename CharT, template< typename > class ActorT, typename FallbackPolicyT, typename ArgsT >
- BOOST_FORCEINLINE format_named_scope_actor< FallbackPolicyT, CharT, ActorT > format_named_scope(attribute_name const& name, FallbackPolicyT const& fallback, ArgsT const& args)
- {
- typedef format_named_scope_actor< FallbackPolicyT, CharT, ActorT > actor_type;
- typedef typename actor_type::terminal_type terminal_type;
- typedef default_named_scope_params< CharT > default_params;
- scope_iteration_direction dir = args[keywords::iteration | expressions::forward];
- const CharT* default_delimiter = (dir == expressions::forward ? default_params::forward_delimiter() : default_params::reverse_delimiter());
- typename actor_type::base_type act =
- {{
- terminal_type
- (
- name,
- fallback,
- args[keywords::format],
- args[keywords::delimiter | default_delimiter],
- args[keywords::incomplete_marker | default_params::incomplete_marker()],
- args[keywords::empty_marker | default_params::empty_marker()],
- args[keywords::depth | static_cast< attributes::named_scope::value_type::size_type >(0)],
- dir
- )
- }};
- return actor_type(act);
- }
- } // namespace aux
- /*!
- * The function generates a manipulator node in a template expression. The manipulator must participate in a formatting
- * expression (stream output or \c format placeholder filler).
- *
- * \param name Attribute name
- * \param element_format Format string for a single named scope
- */
- template< typename CharT >
- BOOST_FORCEINLINE format_named_scope_actor< fallback_to_none, CharT > format_named_scope(attribute_name const& name, const CharT* element_format)
- {
- typedef format_named_scope_actor< fallback_to_none, CharT > actor_type;
- typedef typename actor_type::terminal_type terminal_type;
- typename actor_type::base_type act = {{ terminal_type(name, fallback_to_none(), element_format) }};
- return actor_type(act);
- }
- /*!
- * The function generates a manipulator node in a template expression. The manipulator must participate in a formatting
- * expression (stream output or \c format placeholder filler).
- *
- * \param name Attribute name
- * \param element_format Format string for a single named scope
- */
- template< typename CharT >
- BOOST_FORCEINLINE format_named_scope_actor< fallback_to_none, CharT > format_named_scope(attribute_name const& name, std::basic_string< CharT > const& element_format)
- {
- typedef format_named_scope_actor< fallback_to_none, CharT > actor_type;
- typedef typename actor_type::terminal_type terminal_type;
- typename actor_type::base_type act = {{ terminal_type(name, fallback_to_none(), element_format) }};
- return actor_type(act);
- }
- /*!
- * The function generates a manipulator node in a template expression. The manipulator must participate in a formatting
- * expression (stream output or \c format placeholder filler).
- *
- * \param keyword Attribute keyword
- * \param element_format Format string for a single named scope
- */
- template< typename DescriptorT, template< typename > class ActorT, typename CharT >
- BOOST_FORCEINLINE format_named_scope_actor< fallback_to_none, CharT, ActorT >
- format_named_scope(attribute_keyword< DescriptorT, ActorT > const& keyword, const CharT* element_format)
- {
- BOOST_STATIC_ASSERT_MSG((is_same< typename DescriptorT::value_type, attributes::named_scope::value_type >::value),\
- "Boost.Log: Named scope formatter only accepts attribute values of type attributes::named_scope::value_type.");
- typedef format_named_scope_actor< fallback_to_none, CharT, ActorT > actor_type;
- typedef typename actor_type::terminal_type terminal_type;
- typename actor_type::base_type act = {{ terminal_type(keyword.get_name(), fallback_to_none(), element_format) }};
- return actor_type(act);
- }
- /*!
- * The function generates a manipulator node in a template expression. The manipulator must participate in a formatting
- * expression (stream output or \c format placeholder filler).
- *
- * \param keyword Attribute keyword
- * \param element_format Format string for a single named scope
- */
- template< typename DescriptorT, template< typename > class ActorT, typename CharT >
- BOOST_FORCEINLINE format_named_scope_actor< fallback_to_none, CharT, ActorT >
- format_named_scope(attribute_keyword< DescriptorT, ActorT > const& keyword, std::basic_string< CharT > const& element_format)
- {
- BOOST_STATIC_ASSERT_MSG((is_same< typename DescriptorT::value_type, attributes::named_scope::value_type >::value),\
- "Boost.Log: Named scope formatter only accepts attribute values of type attributes::named_scope::value_type.");
- typedef format_named_scope_actor< fallback_to_none, CharT, ActorT > actor_type;
- typedef typename actor_type::terminal_type terminal_type;
- typename actor_type::base_type act = {{ terminal_type(keyword.get_name(), fallback_to_none(), element_format) }};
- return actor_type(act);
- }
- /*!
- * The function generates a manipulator node in a template expression. The manipulator must participate in a formatting
- * expression (stream output or \c format placeholder filler).
- *
- * \param placeholder Attribute placeholder
- * \param element_format Format string for a single named scope
- */
- template< typename T, typename FallbackPolicyT, typename TagT, template< typename > class ActorT, typename CharT >
- BOOST_FORCEINLINE format_named_scope_actor< FallbackPolicyT, CharT, ActorT >
- format_named_scope(attribute_actor< T, FallbackPolicyT, TagT, ActorT > const& placeholder, const CharT* element_format)
- {
- BOOST_STATIC_ASSERT_MSG((is_same< T, attributes::named_scope::value_type >::value),\
- "Boost.Log: Named scope formatter only accepts attribute values of type attributes::named_scope::value_type.");
- typedef format_named_scope_actor< FallbackPolicyT, CharT, ActorT > actor_type;
- typedef typename actor_type::terminal_type terminal_type;
- typename actor_type::base_type act = {{ terminal_type(placeholder.get_name(), placeholder.get_fallback_policy(), element_format) }};
- return actor_type(act);
- }
- /*!
- * The function generates a manipulator node in a template expression. The manipulator must participate in a formatting
- * expression (stream output or \c format placeholder filler).
- *
- * \param placeholder Attribute placeholder
- * \param element_format Format string for a single named scope
- */
- template< typename T, typename FallbackPolicyT, typename TagT, template< typename > class ActorT, typename CharT >
- BOOST_FORCEINLINE format_named_scope_actor< FallbackPolicyT, CharT, ActorT >
- format_named_scope(attribute_actor< T, FallbackPolicyT, TagT, ActorT > const& placeholder, std::basic_string< CharT > const& element_format)
- {
- BOOST_STATIC_ASSERT_MSG((is_same< T, attributes::named_scope::value_type >::value),\
- "Boost.Log: Named scope formatter only accepts attribute values of type attributes::named_scope::value_type.");
- typedef format_named_scope_actor< FallbackPolicyT, CharT, ActorT > actor_type;
- typedef typename actor_type::terminal_type terminal_type;
- typename actor_type::base_type act = {{ terminal_type(placeholder.get_name(), placeholder.get_fallback_policy(), element_format) }};
- return actor_type(act);
- }
- #if !defined(BOOST_LOG_DOXYGEN_PASS)
- # define BOOST_PP_FILENAME_1 <boost/log/detail/named_scope_fmt_pp.hpp>
- # define BOOST_PP_ITERATION_LIMITS (1, 6)
- # include BOOST_PP_ITERATE()
- #else // BOOST_LOG_DOXYGEN_PASS
- /*!
- * Formatter generator. Construct the named scope formatter with the specified formatting parameters.
- *
- * \param name Attribute name
- * \param args An set of named parameters. Supported parameters:
- * \li \c format - A format string for named scopes. The string can contain "%n", "%f" and "%l" placeholders for the scope name, file and line number, respectively. This parameter is mandatory.
- * \li \c delimiter - A string that is used to delimit the formatted scope names. Default: "->" or "<-", depending on the iteration direction.
- * \li \c incomplete_marker - A string that is used to indicate that the list was printed incomplete because of depth limitation. Default: "...".
- * \li \c empty_marker - A string that is output in case if the scope list is empty. Default: "", i.e. nothing is output.
- * \li \c iteration - Iteration direction, see \c scope_iteration_direction enumeration. Default: forward.
- * \li \c depth - Iteration depth. Default: unlimited.
- */
- template< typename... ArgsT >
- unspecified format_named_scope(attribute_name const& name, ArgsT... const& args);
- /*! \overload */
- template< typename DescriptorT, template< typename > class ActorT, typename... ArgsT >
- unspecified format_named_scope(attribute_keyword< DescriptorT, ActorT > const& keyword, ArgsT... const& args);
- /*! \overload */
- template< typename T, typename FallbackPolicyT, typename TagT, template< typename > class ActorT, typename... ArgsT >
- unspecified format_named_scope(attribute_actor< T, FallbackPolicyT, TagT, ActorT > const& placeholder, ArgsT... const& args);
- #endif // BOOST_LOG_DOXYGEN_PASS
- } // namespace expressions
- BOOST_LOG_CLOSE_NAMESPACE // namespace log
- #ifndef BOOST_LOG_DOXYGEN_PASS
- namespace phoenix {
- namespace result_of {
- template< typename FallbackPolicyT, typename CharT >
- struct is_nullary< custom_terminal< boost::log::expressions::format_named_scope_terminal< FallbackPolicyT, CharT > > > :
- public mpl::false_
- {
- };
- } // namespace result_of
- } // namespace phoenix
- #endif
- } // namespace boost
- #include <boost/log/detail/footer.hpp>
- #endif // BOOST_LOG_EXPRESSIONS_FORMATTERS_NAMED_SCOPE_HPP_INCLUDED_
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