123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869 |
- ///////////////////////////////////////////////////////////////////////////////
- // repeat_end_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_REPEAT_BEGIN_MATCHER_HPP_EAN_10_04_2005
- #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_REPEAT_BEGIN_MATCHER_HPP_EAN_10_04_2005
- // MS compatible compilers support #pragma once
- #if defined(_MSC_VER)
- # pragma once
- #endif
- #include <boost/xpressive/detail/detail_fwd.hpp>
- #include <boost/xpressive/detail/core/quant_style.hpp>
- #include <boost/xpressive/detail/core/state.hpp>
- namespace boost { namespace xpressive { namespace detail
- {
- //
- // Note: here is the variable-width xpression quantifier. It always
- // matches at least once, so if the min is 0, it is the responsibility
- // of the parser to make it alternate with an epsilon matcher.
- //
- ///////////////////////////////////////////////////////////////////////////////
- // repeat_begin_matcher
- //
- struct repeat_begin_matcher
- : quant_style<quant_variable_width, unknown_width::value, false>
- {
- int mark_number_;
- repeat_begin_matcher(int mark_number)
- : mark_number_(mark_number)
- {
- }
- template<typename BidiIter, typename Next>
- bool match(match_state<BidiIter> &state, Next const &next) const
- {
- sub_match_impl<BidiIter> &br = state.sub_match(this->mark_number_);
- unsigned int old_repeat_count = br.repeat_count_;
- bool old_zero_width = br.zero_width_;
- br.repeat_count_ = 1;
- br.zero_width_ = false;
- // "push" next onto the stack, so it can be "popped" in
- // repeat_end_matcher and used to loop back.
- if(next.BOOST_NESTED_TEMPLATE push_match<Next>(state))
- {
- return true;
- }
- br.repeat_count_ = old_repeat_count;
- br.zero_width_ = old_zero_width;
- return false;
- }
- };
- }}}
- #endif
|