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- ///////////////////////////////////////////////////////////////////////////////
- // assert_bol_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_ASSERT_BOL_MATCHER_HPP_EAN_10_04_2005
- #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ASSERT_BOL_MATCHER_HPP_EAN_10_04_2005
- // MS compatible compilers support #pragma once
- #if defined(_MSC_VER)
- # pragma once
- #endif
- #include <boost/next_prior.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/core/matcher/assert_line_base.hpp>
- namespace boost { namespace xpressive { namespace detail
- {
- ///////////////////////////////////////////////////////////////////////////////
- // assert_bol_matcher
- //
- template<typename Traits>
- struct assert_bol_matcher
- : assert_line_base<Traits>
- {
- typedef typename Traits::char_type char_type;
- assert_bol_matcher(Traits const &tr)
- : assert_line_base<Traits>(tr)
- {
- }
- template<typename BidiIter, typename Next>
- bool match(match_state<BidiIter> &state, Next const &next) const
- {
- if(state.bos())
- {
- if(!state.flags_.match_bol_)
- {
- return false;
- }
- }
- else
- {
- char_type ch = *boost::prior(state.cur_);
- // If the previous character is not a newline, we're not at the start of a line
- if(!traits_cast<Traits>(state).isctype(ch, this->newline_))
- {
- return false;
- }
- // There is no line-break between \r and \n
- else if(ch == this->cr_ && !state.eos() && *state.cur_ == this->nl_)
- {
- return false;
- }
- }
- return next.match(state);
- }
- };
- }}}
- #endif
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