///////////////////////////////////////////////////////////////////////////////
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// logical_newline_matcher.hpp
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//
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// Copyright 2008 Eric Niebler. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_LOGICAL_NEWLINE_MATCHER_HPP_EAN_10_04_2005
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#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_LOGICAL_NEWLINE_MATCHER_HPP_EAN_10_04_2005
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/core/quant_style.hpp>
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#include <boost/xpressive/detail/core/state.hpp>
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namespace boost { namespace xpressive { namespace detail
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{
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//////////////////////////////////////////////////////////////////////////
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// logical_newline_matcher
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//
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template<typename Traits>
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struct logical_newline_matcher
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: quant_style_variable_width
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{
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typedef typename Traits::char_type char_type;
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typedef typename Traits::char_class_type char_class_type;
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logical_newline_matcher(Traits const &tr)
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: newline_(lookup_classname(tr, "newline"))
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, nl_(tr.widen('\n'))
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, cr_(tr.widen('\r'))
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{
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}
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template<typename BidiIter, typename Next>
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bool match(match_state<BidiIter> &state, Next const &next) const
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{
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if(state.eos())
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{
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return false;
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}
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char_type ch = *state.cur_;
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if(traits_cast<Traits>(state).isctype(ch, this->newline_))
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{
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++state.cur_;
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if(this->cr_ == ch && !state.eos() && this->nl_ == *state.cur_)
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{
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++state.cur_;
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if(next.match(state))
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{
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return true;
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}
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--state.cur_;
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}
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else if(next.match(state))
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{
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return true;
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}
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--state.cur_;
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}
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return false;
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}
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char_class_type newline() const
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{
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return this->newline_;
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}
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private:
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char_class_type newline_;
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char_type nl_, cr_;
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};
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}}}
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#endif
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