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72 lines
2.1 KiB
72 lines
2.1 KiB
3 years ago
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///////////////////////////////////////////////////////////////////////////////
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// assert_bol_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_ASSERT_BOL_MATCHER_HPP_EAN_10_04_2005
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#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ASSERT_BOL_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/next_prior.hpp>
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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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#include <boost/xpressive/detail/core/matcher/assert_line_base.hpp>
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namespace boost { namespace xpressive { namespace detail
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{
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///////////////////////////////////////////////////////////////////////////////
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// assert_bol_matcher
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//
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template<typename Traits>
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struct assert_bol_matcher
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: assert_line_base<Traits>
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{
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typedef typename Traits::char_type char_type;
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assert_bol_matcher(Traits const &tr)
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: assert_line_base<Traits>(tr)
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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.bos())
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{
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if(!state.flags_.match_bol_)
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{
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return false;
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}
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}
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else
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{
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char_type ch = *boost::prior(state.cur_);
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// If the previous character is not a newline, we're not at the start of a line
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if(!traits_cast<Traits>(state).isctype(ch, this->newline_))
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{
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return false;
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}
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// There is no line-break between \r and \n
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else if(ch == this->cr_ && !state.eos() && *state.cur_ == this->nl_)
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{
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return false;
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}
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}
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return next.match(state);
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}
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};
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}}}
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#endif
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