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143 lines
4.1 KiB
143 lines
4.1 KiB
/////////////////////////////////////////////////////////////////////////////// |
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// visitor.hpp |
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// |
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// Copyright 2008 Eric Niebler. Distributed under the Boost |
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// Software License, Version 1.0. (See accompanying file |
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_XPRESSIVE_DETAIL_STATIC_VISITOR_HPP_EAN_10_04_2005 |
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#define BOOST_XPRESSIVE_DETAIL_STATIC_VISITOR_HPP_EAN_10_04_2005 |
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// MS compatible compilers support #pragma once |
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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#include <boost/ref.hpp> |
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#include <boost/shared_ptr.hpp> |
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#include <boost/xpressive/detail/detail_fwd.hpp> |
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#include <boost/xpressive/detail/core/regex_impl.hpp> |
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#include <boost/xpressive/detail/static/transmogrify.hpp> |
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#include <boost/xpressive/detail/core/matcher/mark_begin_matcher.hpp> |
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namespace boost { namespace xpressive { namespace detail |
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{ |
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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template<typename BidiIter> |
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struct xpression_visitor_base |
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{ |
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explicit xpression_visitor_base(shared_ptr<regex_impl<BidiIter> > const &self) |
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: self_(self) |
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{ |
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} |
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void swap(xpression_visitor_base<BidiIter> &that) |
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{ |
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this->self_.swap(that.self_); |
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} |
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int get_hidden_mark() |
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{ |
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return -(int)(++this->self_->hidden_mark_count_); |
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} |
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void mark_number(int mark_nbr) |
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{ |
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if(0 < mark_nbr) |
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{ |
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this->self_->mark_count_ = |
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(std::max)(this->self_->mark_count_, (std::size_t)mark_nbr); |
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} |
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} |
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shared_ptr<regex_impl<BidiIter> > &self() |
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{ |
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return this->self_; |
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} |
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protected: |
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template<typename Matcher> |
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void visit_(Matcher const &) |
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{ |
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} |
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void visit_(reference_wrapper<basic_regex<BidiIter> > const &rex) |
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{ |
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// when visiting an embedded regex, track the references |
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this->self_->track_reference(*detail::core_access<BidiIter>::get_regex_impl(rex.get())); |
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} |
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void visit_(reference_wrapper<basic_regex<BidiIter> const> const &rex) |
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{ |
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// when visiting an embedded regex, track the references |
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this->self_->track_reference(*detail::core_access<BidiIter>::get_regex_impl(rex.get())); |
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} |
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void visit_(tracking_ptr<regex_impl<BidiIter> > const &rex) |
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{ |
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// when visiting an embedded regex, track the references |
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this->self_->track_reference(*rex.get()); |
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} |
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void visit_(mark_placeholder const &backref) |
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{ |
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// keep track of the largest mark number found |
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this->mark_number(backref.mark_number_); |
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} |
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void visit_(mark_begin_matcher const &mark_begin) |
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{ |
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// keep track of the largest mark number found |
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this->mark_number(mark_begin.mark_number_); |
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} |
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private: |
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shared_ptr<regex_impl<BidiIter> > self_; |
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}; |
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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template<typename BidiIter, typename ICase, typename Traits> |
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struct xpression_visitor |
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: xpression_visitor_base<BidiIter> |
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{ |
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typedef BidiIter iterator_type; |
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typedef ICase icase_type; |
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typedef Traits traits_type; |
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typedef typename boost::iterator_value<BidiIter>::type char_type; |
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explicit xpression_visitor(Traits const &tr, shared_ptr<regex_impl<BidiIter> > const &self) |
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: xpression_visitor_base<BidiIter>(self) |
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, traits_(tr) |
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{ |
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} |
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template<typename Matcher> |
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struct apply |
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{ |
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typedef typename transmogrify<BidiIter, ICase, Traits, Matcher>::type type; |
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}; |
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template<typename Matcher> |
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typename apply<Matcher>::type |
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call(Matcher const &matcher) |
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{ |
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this->visit_(matcher); |
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return transmogrify<BidiIter, ICase, Traits, Matcher>::call(matcher, *this); |
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} |
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Traits const &traits() const |
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{ |
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return this->traits_; |
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} |
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private: |
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Traits traits_; |
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}; |
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}}} |
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#endif
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