[857] | 1 | /*=============================================================================
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| 2 | Copyright (c) 2001-2003 Daniel Nuffer
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| 3 | http://spirit.sourceforge.net/
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| 4 |
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| 5 | Use, modification and distribution is subject to the Boost Software
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| 6 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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| 7 | http://www.boost.org/LICENSE_1_0.txt)
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| 8 | =============================================================================*/
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| 9 | #ifndef BOOST_SPIRIT_FLUSH_MULTI_PASS_HPP
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| 10 | #define BOOST_SPIRIT_FLUSH_MULTI_PASS_HPP
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| 11 |
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| 12 | ///////////////////////////////////////////////////////////////////////////////
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| 13 | #include <boost/spirit/core.hpp>
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| 14 | #include <boost/spirit/iterator/multi_pass.hpp>
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| 15 |
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| 16 | ///////////////////////////////////////////////////////////////////////////////
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| 17 | namespace boost { namespace spirit {
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| 18 |
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| 19 | namespace impl {
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| 20 |
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| 21 | template <typename T>
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| 22 | void flush_iterator(T &) {}
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| 23 |
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| 24 | template <typename T1, typename T2, typename T3, typename T4>
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| 25 | void flush_iterator(boost::spirit::multi_pass<
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| 26 | T1, T2, T3, T4, boost::spirit::multi_pass_policies::std_deque> &i)
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| 27 | {
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| 28 | i.clear_queue();
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| 29 | }
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| 30 |
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| 31 | } // namespace impl
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| 32 |
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| 33 | ///////////////////////////////////////////////////////////////////////////
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| 34 | //
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| 35 | // flush_multi_pass_parser
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| 36 | //
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| 37 | // The flush_multi_pass_parser flushes an underlying
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| 38 | // multi_pass_iterator during the normal parsing process. This may
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| 39 | // be used at certain points during the parsing process, when it is
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| 40 | // clear, that no backtracking is needed anymore and the input
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| 41 | // gathered so far may be discarded.
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| 42 | //
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| 43 | ///////////////////////////////////////////////////////////////////////////
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| 44 | class flush_multi_pass_parser
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| 45 | : public parser<flush_multi_pass_parser>
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| 46 | {
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| 47 | public:
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| 48 | typedef flush_multi_pass_parser this_t;
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| 49 |
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| 50 | template <typename ScannerT>
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| 51 | typename parser_result<this_t, ScannerT>::type
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| 52 | parse(ScannerT const& scan) const
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| 53 | {
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| 54 | impl::flush_iterator(scan.first);
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| 55 | return scan.empty_match();
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| 56 | }
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| 57 | };
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| 58 |
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| 59 | ///////////////////////////////////////////////////////////////////////////
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| 60 | //
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| 61 | // predefined flush_multi_pass_p object
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| 62 | //
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| 63 | // This object should may used to flush a multi_pass_iterator along
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| 64 | // the way during the normal parsing process.
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| 65 | //
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| 66 | ///////////////////////////////////////////////////////////////////////////
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| 67 |
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| 68 | flush_multi_pass_parser const
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| 69 | flush_multi_pass_p = flush_multi_pass_parser();
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| 70 |
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| 71 | }} // namespace boost::spirit
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| 72 |
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| 73 | #endif // BOOST_SPIRIT_FLUSH_MULTI_PASS_HPP
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