boost/xpressive/detail/core/matcher/assert_line_base.hpp
///////////////////////////////////////////////////////////////////////////////
// assert_line_base.hpp
//
// Copyright 2007 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_DETAIL_ASSERT_LINE_BASE_HPP_EAN_10_04_2005
#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_DETAIL_ASSERT_LINE_BASE_HPP_EAN_10_04_2005
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# 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
{
///////////////////////////////////////////////////////////////////////////////
// assert_line_base
//
template<typename Traits>
struct assert_line_base
: quant_style_assertion
{
typedef typename Traits::char_type char_type;
typedef typename Traits::char_class_type char_class_type;
protected:
assert_line_base(Traits const &traits)
: newline_(lookup_classname(traits, "newline"))
, nl_(traits.widen('\n'))
, cr_(traits.widen('\r'))
{
}
template<typename BidiIter>
bool is_line_break(match_state<BidiIter> &state) const
{
BOOST_ASSERT(!state.bos() || state.flags_.match_prev_avail_);
BidiIter tmp = state.cur_;
char_type ch = *--tmp;
if(traits_cast<Traits>(state).isctype(ch, this->newline_))
{
// there is no line-break between \r and \n
if(this->cr_ != ch || state.eos() || this->nl_ != *state.cur_)
{
return true;
}
}
return false;
}
private:
char_class_type newline_;
char_type nl_, cr_;
};
}}}
#endif