FM / matcher

/usr/include/boost/xpressive/detail/core/matcher/

/usr/include/boost/xpressive/detail/core/matcher

Name	Size	Mode	Actions
action_matcher.hpp	16313	0644	edit dl rm
alternate_end_matcher.hpp	1437	0644	edit dl rm
alternate_matcher.hpp	4164	0644	edit dl rm
any_matcher.hpp	1368	0644	edit dl rm
assert_bol_matcher.hpp	2182	0644	edit dl rm
assert_bos_matcher.hpp	1235	0644	edit dl rm
assert_eol_matcher.hpp	2223	0644	edit dl rm
assert_eos_matcher.hpp	1229	0644	edit dl rm
assert_line_base.hpp	1394	0644	edit dl rm
assert_word_matcher.hpp	3763	0644	edit dl rm
attr_begin_matcher.hpp	1575	0644	edit dl rm
attr_end_matcher.hpp	1427	0644	edit dl rm
attr_matcher.hpp	3451	0644	edit dl rm
charset_matcher.hpp	1851	0644	edit dl rm
end_matcher.hpp	3167	0644	edit dl rm
epsilon_matcher.hpp	1162	0644	edit dl rm
keeper_matcher.hpp	3026	0644	edit dl rm
literal_matcher.hpp	1949	0644	edit dl rm
logical_newline_matcher.hpp	2385	0644	edit dl rm
lookahead_matcher.hpp	4806	0644	edit dl rm
lookbehind_matcher.hpp	5772	0644	edit dl rm
mark_begin_matcher.hpp	1619	0644	edit dl rm
mark_end_matcher.hpp	1788	0644	edit dl rm
mark_matcher.hpp	2427	0644	edit dl rm
optional_matcher.hpp	3954	0644	edit dl rm
posix_charset_matcher.hpp	2036	0644	edit dl rm
predicate_matcher.hpp	5929	0644	edit dl rm
range_matcher.hpp	2462	0644	edit dl rm
regex_byref_matcher.hpp	2760	0644	edit dl rm
regex_matcher.hpp	2299	0644	edit dl rm
repeat_begin_matcher.hpp	2162	0644	edit dl rm
repeat_end_matcher.hpp	3737	0644	edit dl rm
set_matcher.hpp	2623	0644	edit dl rm
simple_repeat_matcher.hpp	7924	0644	edit dl rm
string_matcher.hpp	2859	0644	edit dl rm
true_matcher.hpp	1103	0644	edit dl rm

Edit: /usr/include/boost/xpressive/detail/core/matcher/lookahead_matcher.hpp (4806B)

///////////////////////////////////////////////////////////////////////////////
// lookahead_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_LOOKAHEAD_MATCHER_HPP_EAN_10_04_2005
#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_LOOKAHEAD_MATCHER_HPP_EAN_10_04_2005

// MS compatible compilers support #pragma once
#if defined(_MSC_VER)
# pragma once
#endif

#include <boost/assert.hpp>
#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>
#include <boost/xpressive/detail/utility/save_restore.hpp>
#include <boost/xpressive/detail/utility/ignore_unused.hpp>

namespace boost { namespace xpressive { namespace detail
{

///////////////////////////////////////////////////////////////////////////////
    // lookahead_matcher
    //   Xpr can be either a static_xpression, or a shared_matchable
    //
    template<typename Xpr>
    struct lookahead_matcher
      : quant_style<quant_none, 0, Xpr::pure>
    {
        lookahead_matcher(Xpr const &xpr, bool no, bool pure = Xpr::pure)
          : xpr_(xpr)
          , not_(no)
          , pure_(pure)
        {
        }

void inverse()
        {
            this->not_ = !this->not_;
        }

template<typename BidiIter, typename Next>
        bool match(match_state<BidiIter> &state, Next const &next) const
        {
            return Xpr::pure || this->pure_
              ? this->match_(state, next, mpl::true_())
              : this->match_(state, next, mpl::false_());
        }

template<typename BidiIter, typename Next>
        bool match_(match_state<BidiIter> &state, Next const &next, mpl::true_) const
        {
            BidiIter const tmp = state.cur_;

if(this->not_)
            {
                // negative look-ahead assertions do not trigger partial matches.
                save_restore<bool> partial_match(state.found_partial_match_);
                detail::ignore_unused(partial_match);

if(this->xpr_.match(state))
                {
                    state.cur_ = tmp;
                    return false;
                }
                else if(next.match(state))
                {
                    return true;
                }
            }
            else
            {
                if(!this->xpr_.match(state))
                {
                    return false;
                }
                state.cur_ = tmp;
                if(next.match(state))
                {
                    return true;
                }
            }

BOOST_ASSERT(state.cur_ == tmp);
            return false;
        }

template<typename BidiIter, typename Next>
        bool match_(match_state<BidiIter> &state, Next const &next, mpl::false_) const
        {
            BidiIter const tmp = state.cur_;

// matching xpr could produce side-effects, save state
            memento<BidiIter> mem = save_sub_matches(state);

if(this->xpr_.match(state))
                {
                    restore_action_queue(mem, state);
                    restore_sub_matches(mem, state);
                    state.cur_ = tmp;
                    return false;
                }
                restore_action_queue(mem, state);
                if(next.match(state))
                {
                    reclaim_sub_matches(mem, state, true);
                    return true;
                }
                reclaim_sub_matches(mem, state, false);
            }
            else
            {
                if(!this->xpr_.match(state))
                {
                    restore_action_queue(mem, state);
                    reclaim_sub_matches(mem, state, false);
                    return false;
                }
                state.cur_ = tmp;
                restore_action_queue(mem, state);
                if(next.match(state))
                {
                    reclaim_sub_matches(mem, state, true);
                    return true;
                }
                restore_sub_matches(mem, state);
            }

BOOST_ASSERT(state.cur_ == tmp);
            return false;
        }

Xpr xpr_;
        bool not_;
        bool pure_; // false if matching xpr_ could modify the sub-matches
    };

}}}

#endif

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