/*=============================================================================
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Copyright (c) 2001-2003 Daniel Nuffer
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http://spirit.sourceforge.net/
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef BOOST_SPIRIT_FLUSH_MULTI_PASS_HPP
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#define BOOST_SPIRIT_FLUSH_MULTI_PASS_HPP
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/spirit/home/classic/namespace.hpp>
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#include <boost/spirit/home/classic/core.hpp>
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#include <boost/spirit/home/classic/iterator/multi_pass.hpp>
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit {
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BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
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namespace impl {
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template <typename T>
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void flush_iterator(T &) {}
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template <typename T1, typename T2, typename T3, typename T4>
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void flush_iterator(BOOST_SPIRIT_CLASSIC_NS::multi_pass<
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T1, T2, T3, T4, BOOST_SPIRIT_CLASSIC_NS::multi_pass_policies::std_deque> &i)
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{
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i.clear_queue();
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}
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} // namespace impl
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///////////////////////////////////////////////////////////////////////////
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//
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// flush_multi_pass_parser
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//
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// The flush_multi_pass_parser flushes an underlying
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// multi_pass_iterator during the normal parsing process. This may
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// be used at certain points during the parsing process, when it is
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// clear, that no backtracking is needed anymore and the input
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// gathered so far may be discarded.
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//
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///////////////////////////////////////////////////////////////////////////
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class flush_multi_pass_parser
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: public parser<flush_multi_pass_parser>
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{
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public:
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typedef flush_multi_pass_parser this_t;
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template <typename ScannerT>
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typename parser_result<this_t, ScannerT>::type
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parse(ScannerT const& scan) const
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{
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impl::flush_iterator(scan.first);
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return scan.empty_match();
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}
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};
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///////////////////////////////////////////////////////////////////////////
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//
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// predefined flush_multi_pass_p object
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//
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// This object should may used to flush a multi_pass_iterator along
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// the way during the normal parsing process.
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//
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///////////////////////////////////////////////////////////////////////////
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flush_multi_pass_parser const
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flush_multi_pass_p = flush_multi_pass_parser();
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BOOST_SPIRIT_CLASSIC_NAMESPACE_END
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}} // namespace BOOST_SPIRIT_CLASSIC_NS
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#endif // BOOST_SPIRIT_FLUSH_MULTI_PASS_HPP
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