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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)
- # 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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