/////////////////////////////////////////////////////////////////////////////// | |
// 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) && (_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 | |
{ | |
////////////////////////////////////////////////////////////////////////// | |
// 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 |