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///////////////////////////////////////////////////////////////////////////////
// attr_matcher.hpp
//
// Copyright 2008 Eric Niebler.
// Copyright 2008 David Jenkins.
//
// 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_ATTR_MATCHER_HPP_EAN_06_09_2007
#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ATTR_MATCHER_HPP_EAN_06_09_2007
// 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>
#include <boost/xpressive/detail/utility/symbols.hpp>
namespace boost { namespace xpressive { namespace detail
{
///////////////////////////////////////////////////////////////////////////////
// char_translate
//
template<typename Traits, bool ICase>
struct char_translate
{
typedef typename Traits::char_type char_type;
Traits const &traits_;
explicit char_translate(Traits const &tr)
: traits_(tr)
{}
char_type operator ()(char_type ch1) const
{
return this->traits_.translate(ch1);
}
private:
char_translate &operator =(char_translate const &);
};
///////////////////////////////////////////////////////////////////////////////
// char_translate
//
template<typename Traits>
struct char_translate<Traits, true>
{
typedef typename Traits::char_type char_type;
Traits const &traits_;
explicit char_translate(Traits const &tr)
: traits_(tr)
{}
char_type operator ()(char_type ch1) const
{
return this->traits_.translate_nocase(ch1);
}
private:
char_translate &operator =(char_translate const &);
};
///////////////////////////////////////////////////////////////////////////////
// attr_matcher
// Note: the Matcher is a std::map
template<typename Matcher, typename Traits, typename ICase>
struct attr_matcher
: quant_style<quant_none, 0, false>
{
typedef typename Matcher::value_type::second_type const* result_type;
attr_matcher(int slot, Matcher const &matcher, Traits const& tr)
: slot_(slot-1)
{
char_translate<Traits, ICase::value> trans(tr);
this->sym_.load(matcher, trans);
}
template<typename BidiIter, typename Next>
bool match(match_state<BidiIter> &state, Next const &next) const
{
BidiIter tmp = state.cur_;
char_translate<Traits, ICase::value> trans(traits_cast<Traits>(state));
result_type const &result = this->sym_(state.cur_, state.end_, trans);
if(result)
{
void const *old_slot = state.attr_context_.attr_slots_[this->slot_];
state.attr_context_.attr_slots_[this->slot_] = &*result;
if(next.match(state))
{
return true;
}
state.attr_context_.attr_slots_[this->slot_] = old_slot;
}
state.cur_ = tmp;
return false;
}
int slot_;
boost::xpressive::detail::symbols<Matcher> sym_;
};
}}}
#endif
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