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- ///////////////////////////////////////////////////////////////////////////////
- // mark_matcher.hpp
- //
- // Copyright 2008 Eric Niebler. 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)
- #ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_MARK_MATCHER_HPP_EAN_10_04_2005
- #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_MARK_MATCHER_HPP_EAN_10_04_2005
- // MS compatible compilers support #pragma once
- #if defined(_MSC_VER)
- # pragma once
- #endif
- #include <boost/assert.hpp>
- #include <boost/xpressive/detail/detail_fwd.hpp>
- #include <boost/xpressive/detail/core/quant_style.hpp>
- #include <boost/xpressive/detail/core/state.hpp>
- #include <boost/xpressive/detail/utility/traits_utils.hpp>
- namespace boost { namespace xpressive { namespace detail
- {
- // TODO: the mark matcher is acually a fixed-width matcher, but the width is
- // not known until pattern match time.
- ///////////////////////////////////////////////////////////////////////////////
- // mark_matcher
- //
- template<typename Traits, typename ICase>
- struct mark_matcher
- : quant_style_variable_width
- {
- typedef ICase icase_type;
- int mark_number_;
- mark_matcher(int mark_number, Traits const &)
- : mark_number_(mark_number)
- {
- }
- template<typename BidiIter, typename Next>
- bool match(match_state<BidiIter> &state, Next const &next) const
- {
- BOOST_ASSERT(this->mark_number_ < static_cast<int>(state.mark_count_));
- sub_match_impl<BidiIter> const &br = state.sub_match(this->mark_number_);
- if(!br.matched)
- {
- return false;
- }
- BidiIter const tmp = state.cur_;
- for(BidiIter begin = br.first, end = br.second; begin != end; ++begin, ++state.cur_)
- {
- if(state.eos()
- || detail::translate(*state.cur_, traits_cast<Traits>(state), icase_type())
- != detail::translate(*begin, traits_cast<Traits>(state), icase_type()))
- {
- state.cur_ = tmp;
- return false;
- }
- }
- if(next.match(state))
- {
- return true;
- }
- state.cur_ = tmp;
- return false;
- }
- };
- }}}
- #endif
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