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///////////////////////////////////////////////////////////////////////////////
// range_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_RANGE_MATCHER_HPP_EAN_10_04_2005
#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_RANGE_MATCHER_HPP_EAN_10_04_2005
// MS compatible compilers support #pragma once
#if defined(_MSC_VER)
# pragma once
# pragma warning(push)
# pragma warning(disable : 4100) // unreferenced formal parameter
#endif
#include <boost/mpl/bool.hpp>
#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
{
///////////////////////////////////////////////////////////////////////////////
// range_matcher
//
template<typename Traits, typename ICase>
struct range_matcher
: quant_style_fixed_width<1>
{
typedef typename Traits::char_type char_type;
typedef ICase icase_type;
char_type ch_min_;
char_type ch_max_;
bool not_;
range_matcher(char_type ch_min, char_type ch_max, bool no, Traits const &)
: ch_min_(ch_min)
, ch_max_(ch_max)
, not_(no)
{
}
void inverse()
{
this->not_ = !this->not_;
}
bool in_range(Traits const &tr, char_type ch, mpl::false_) const // case-sensitive
{
return tr.in_range(this->ch_min_, this->ch_max_, ch);
}
bool in_range(Traits const &tr, char_type ch, mpl::true_) const // case-insensitive
{
return tr.in_range_nocase(this->ch_min_, this->ch_max_, ch);
}
template<typename BidiIter, typename Next>
bool match(match_state<BidiIter> &state, Next const &next) const
{
if(state.eos() || this->not_ ==
this->in_range(traits_cast<Traits>(state), *state.cur_, icase_type()))
{
return false;
}
++state.cur_;
if(next.match(state))
{
return true;
}
--state.cur_;
return false;
}
};
}}}
#if defined(_MSC_VER)
# pragma warning(pop)
#endif
#endif
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