You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
2.1 KiB
70 lines
2.1 KiB
///////////////////////////////////////////////////////////////////////////////
|
|
// repeat_end_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_REPEAT_BEGIN_MATCHER_HPP_EAN_10_04_2005
|
|
#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_REPEAT_BEGIN_MATCHER_HPP_EAN_10_04_2005
|
|
|
|
// 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>
|
|
|
|
namespace boost { namespace xpressive { namespace detail
|
|
{
|
|
|
|
//
|
|
// Note: here is the variable-width xpression quantifier. It always
|
|
// matches at least once, so if the min is 0, it is the responsibility
|
|
// of the parser to make it alternate with an epsilon matcher.
|
|
//
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// repeat_begin_matcher
|
|
//
|
|
struct repeat_begin_matcher
|
|
: quant_style<quant_variable_width, unknown_width::value, false>
|
|
{
|
|
int mark_number_;
|
|
|
|
repeat_begin_matcher(int mark_number)
|
|
: mark_number_(mark_number)
|
|
{
|
|
}
|
|
|
|
template<typename BidiIter, typename Next>
|
|
bool match(match_state<BidiIter> &state, Next const &next) const
|
|
{
|
|
sub_match_impl<BidiIter> &br = state.sub_match(this->mark_number_);
|
|
|
|
unsigned int old_repeat_count = br.repeat_count_;
|
|
bool old_zero_width = br.zero_width_;
|
|
|
|
br.repeat_count_ = 1;
|
|
br.zero_width_ = false;
|
|
|
|
// "push" next onto the stack, so it can be "popped" in
|
|
// repeat_end_matcher and used to loop back.
|
|
if(next.BOOST_NESTED_TEMPLATE push_match<Next>(state))
|
|
{
|
|
return true;
|
|
}
|
|
|
|
br.repeat_count_ = old_repeat_count;
|
|
br.zero_width_ = old_zero_width;
|
|
|
|
return false;
|
|
}
|
|
};
|
|
|
|
}}}
|
|
|
|
#endif
|