130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
/*
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* Copyright Andrey Semashev 2007 - 2013.
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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 matches.hpp
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* \author Andrey Semashev
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* \date 30.03.2008
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*
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* This header contains a predicate for checking if the provided string matches a regular expression.
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*/
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#ifndef BOOST_LOG_UTILITY_FUNCTIONAL_MATCHES_HPP_INCLUDED_
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#define BOOST_LOG_UTILITY_FUNCTIONAL_MATCHES_HPP_INCLUDED_
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/eval_if.hpp>
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#include <boost/log/detail/config.hpp>
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#include <boost/log/detail/header.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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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 not supported for matching against strings
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struct unsupported_match_expression_tag;
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//! This tag type is used if an expression is recognized as a Boost.Regex expression
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struct boost_regex_expression_tag;
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//! This tag type is used if an expression is recognized as a Boost.Xpressive expression
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struct boost_xpressive_expression_tag;
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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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//! This tag type is used if an expression is recognized as a Boost.Spirit.Qi expression
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struct boost_spirit_qi_expression_tag;
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//! Preliminary declaration of a trait that detects if an expression is a Boost.Regex expression
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template< typename, bool = true >
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struct is_regex :
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public mpl::false_
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{
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};
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//! Preliminary declaration of a trait that detects if an expression is a Boost.Xpressive expression
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template< typename, bool = true >
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struct is_xpressive_regex :
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public mpl::false_
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{
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};
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//! Preliminary declaration of a trait that detects if an expression is a Boost.Spirit (classic) expression
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template< typename, bool = true >
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struct is_spirit_classic_parser :
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public mpl::false_
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{
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};
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//! Preliminary declaration of a trait that detects if an expression is a Boost.Spirit.Qi expression
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template< typename, bool = true >
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struct is_spirit_qi_parser :
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public mpl::false_
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{
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};
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//! The regex matching functor implementation
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template< typename TagT >
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struct matches_fun_impl;
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} // namespace aux
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//! The regex matching functor
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struct matches_fun
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{
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typedef bool result_type;
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private:
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//! A traits to obtain the tag of the expression
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template< typename ExpressionT >
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struct match_traits
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{
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typedef typename mpl::eval_if<
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aux::is_regex< ExpressionT >,
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mpl::identity< aux::boost_regex_expression_tag >,
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mpl::eval_if<
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aux::is_xpressive_regex< ExpressionT >,
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mpl::identity< aux::boost_xpressive_expression_tag >,
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mpl::eval_if<
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aux::is_spirit_classic_parser< ExpressionT >,
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mpl::identity< aux::boost_spirit_classic_expression_tag >,
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mpl::if_<
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aux::is_spirit_qi_parser< ExpressionT >,
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aux::boost_spirit_qi_expression_tag,
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aux::unsupported_match_expression_tag
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>
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>
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>
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>::type tag_type;
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};
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public:
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template< typename StringT, typename ExpressionT >
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bool operator() (StringT const& str, ExpressionT const& expr) const
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{
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typedef typename match_traits< ExpressionT >::tag_type tag_type;
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typedef aux::matches_fun_impl< tag_type > impl;
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return impl::matches(str, expr);
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}
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template< typename StringT, typename ExpressionT, typename ArgT >
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bool operator() (StringT const& str, ExpressionT const& expr, ArgT const& arg) const
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{
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typedef typename match_traits< ExpressionT >::tag_type tag_type;
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typedef aux::matches_fun_impl< tag_type > impl;
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return impl::matches(str, expr, arg);
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}
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};
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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_UTILITY_FUNCTIONAL_MATCHES_HPP_INCLUDED_
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