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- ///////////////////////////////////////////////////////////////////////////////
- // logical_newline_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_LOGICAL_NEWLINE_MATCHER_HPP_EAN_10_04_2005
- #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_LOGICAL_NEWLINE_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
- {
- //////////////////////////////////////////////////////////////////////////
- // logical_newline_matcher
- //
- template<typename Traits>
- struct logical_newline_matcher
- : quant_style_variable_width
- {
- typedef typename Traits::char_type char_type;
- typedef typename Traits::char_class_type char_class_type;
- logical_newline_matcher(Traits const &tr)
- : newline_(lookup_classname(tr, "newline"))
- , nl_(tr.widen('\n'))
- , cr_(tr.widen('\r'))
- {
- }
- template<typename BidiIter, typename Next>
- bool match(match_state<BidiIter> &state, Next const &next) const
- {
- if(state.eos())
- {
- return false;
- }
- char_type ch = *state.cur_;
- if(traits_cast<Traits>(state).isctype(ch, this->newline_))
- {
- ++state.cur_;
- if(this->cr_ == ch && !state.eos() && this->nl_ == *state.cur_)
- {
- ++state.cur_;
- if(next.match(state))
- {
- return true;
- }
- --state.cur_;
- }
- else if(next.match(state))
- {
- return true;
- }
- --state.cur_;
- }
- return false;
- }
- char_class_type newline() const
- {
- return this->newline_;
- }
- private:
- char_class_type newline_;
- char_type nl_, cr_;
- };
- }}}
- #endif
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