core/matcher/charset_matcher.hpp

0001 ///////////////////////////////////////////////////////////////////////////////
0002 // charset_matcher.hpp
0003 //
0004 //  Copyright 2008 Eric Niebler. Distributed under the Boost
0005 //  Software License, Version 1.0. (See accompanying file
0006 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0007
0008 #ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_CHARSET_MATCHER_HPP_EAN_10_04_2005
0009 #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_CHARSET_MATCHER_HPP_EAN_10_04_2005
0010
0011 // MS compatible compilers support #pragma once
0012 #if defined(_MSC_VER)
0013 # pragma once
0014 #endif
0015
0016 #include <boost/xpressive/detail/detail_fwd.hpp>
0017 #include <boost/xpressive/detail/core/quant_style.hpp>
0018 #include <boost/xpressive/detail/core/state.hpp>
0019
0020 namespace boost { namespace xpressive { namespace detail
0021 {
0022
0023     ///////////////////////////////////////////////////////////////////////////////
0024     // charset_matcher
0025     //
0026     template<typename Traits, typename ICase, typename CharSet>
0027     struct charset_matcher
0028       : quant_style_fixed_width<1>
0029     {
0030         typedef typename Traits::char_type char_type;
0031         typedef Traits traits_type;
0032         typedef ICase icase_type;
0033
0034         charset_matcher(CharSet const &charset = CharSet())
0035           : charset_(charset)
0036         {
0037         }
0038
0039         void inverse()
0040         {
0041             this->charset_.inverse();
0042         }
0043
0044         template<typename BidiIter, typename Next>
0045         bool match(match_state<BidiIter> &state, Next const &next) const
0046         {
0047             if(state.eos() || !this->charset_.test(*state.cur_, traits_cast<Traits>(state), icase_type()))
0048             {
0049                 return false;
0050             }
0051
0052             ++state.cur_;
0053             if(next.match(state))
0054             {
0055                 return true;
0056             }
0057
0058             --state.cur_;
0059             return false;
0060         }
0061
0062         CharSet charset_;
0063     };
0064
0065 }}}
0066
0067 #endif