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112 lines
3.4 KiB
112 lines
3.4 KiB
///////////////////////////////////////////////////////////////////////////////
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// attr_matcher.hpp
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//
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// Copyright 2008 Eric Niebler.
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// Copyright 2008 David Jenkins.
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ATTR_MATCHER_HPP_EAN_06_09_2007
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#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ATTR_MATCHER_HPP_EAN_06_09_2007
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// MS compatible compilers support #pragma once
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/xpressive/detail/detail_fwd.hpp>
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#include <boost/xpressive/detail/core/quant_style.hpp>
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#include <boost/xpressive/detail/core/state.hpp>
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#include <boost/xpressive/detail/utility/symbols.hpp>
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namespace boost { namespace xpressive { namespace detail
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{
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///////////////////////////////////////////////////////////////////////////////
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// char_translate
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//
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template<typename Traits, bool ICase>
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struct char_translate
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{
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typedef typename Traits::char_type char_type;
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Traits const &traits_;
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explicit char_translate(Traits const &tr)
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: traits_(tr)
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{}
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char_type operator ()(char_type ch1) const
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{
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return this->traits_.translate(ch1);
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}
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private:
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char_translate &operator =(char_translate const &);
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};
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///////////////////////////////////////////////////////////////////////////////
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// char_translate
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//
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template<typename Traits>
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struct char_translate<Traits, true>
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{
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typedef typename Traits::char_type char_type;
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Traits const &traits_;
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explicit char_translate(Traits const &tr)
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: traits_(tr)
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{}
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char_type operator ()(char_type ch1) const
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{
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return this->traits_.translate_nocase(ch1);
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}
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private:
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char_translate &operator =(char_translate const &);
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};
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///////////////////////////////////////////////////////////////////////////////
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// attr_matcher
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// Note: the Matcher is a std::map
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template<typename Matcher, typename Traits, typename ICase>
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struct attr_matcher
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: quant_style<quant_none, 0, false>
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{
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typedef typename Matcher::value_type::second_type const* result_type;
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attr_matcher(int slot, Matcher const &matcher, Traits const& tr)
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: slot_(slot-1)
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{
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char_translate<Traits, ICase::value> trans(tr);
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this->sym_.load(matcher, trans);
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}
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template<typename BidiIter, typename Next>
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bool match(match_state<BidiIter> &state, Next const &next) const
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{
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BidiIter tmp = state.cur_;
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char_translate<Traits, ICase::value> trans(traits_cast<Traits>(state));
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result_type const &result = this->sym_(state.cur_, state.end_, trans);
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if(result)
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{
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void const *old_slot = state.attr_context_.attr_slots_[this->slot_];
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state.attr_context_.attr_slots_[this->slot_] = &*result;
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if(next.match(state))
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{
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return true;
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}
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state.attr_context_.attr_slots_[this->slot_] = old_slot;
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}
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state.cur_ = tmp;
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return false;
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}
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int slot_;
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boost::xpressive::detail::symbols<Matcher> sym_;
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};
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}}}
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#endif
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