| 1 | /*============================================================================= |
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| 2 | Copyright (c) 2002-2003 Joel de Guzman |
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| 3 | Copyright (c) 2002-2003 Juan Carlos Arevalo-Baeza |
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| 4 | http://spirit.sourceforge.net/ |
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| 5 | |
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| 6 | Use, modification and distribution is subject to the Boost Software |
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| 7 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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| 8 | http://www.boost.org/LICENSE_1_0.txt) |
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| 9 | =============================================================================*/ |
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| 10 | #ifndef BOOST_SPIRIT_FUNCTOR_PARSER_HPP |
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| 11 | #define BOOST_SPIRIT_FUNCTOR_PARSER_HPP |
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| 12 | |
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| 13 | /////////////////////////////////////////////////////////////////////////////// |
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| 14 | #include <boost/spirit/core/parser.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 | /////////////////////////////////////////////////////////////////////////// |
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| 20 | // |
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| 21 | // functor_parser class |
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| 22 | // |
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| 23 | // Once a functor parser has been defined, you can build a real |
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| 24 | // parser from it by passing it to this class as the template |
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| 25 | // parameter. |
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| 26 | // |
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| 27 | /////////////////////////////////////////////////////////////////////////// |
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| 28 | template < class FunctorT > |
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| 29 | struct functor_parser : public parser<functor_parser<FunctorT> > |
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| 30 | { |
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| 31 | FunctorT functor; |
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| 32 | |
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| 33 | functor_parser(): functor() {} |
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| 34 | functor_parser(FunctorT const& functor_): functor(functor_) {} |
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| 35 | |
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| 36 | typedef typename FunctorT::result_t functor_result_t; |
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| 37 | typedef functor_parser<FunctorT> self_t; |
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| 38 | |
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| 39 | template <typename ScannerT> |
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| 40 | struct result |
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| 41 | { |
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| 42 | typedef typename match_result<ScannerT, functor_result_t>::type |
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| 43 | type; |
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| 44 | }; |
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| 45 | |
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| 46 | template <typename ScannerT> |
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| 47 | typename parser_result<self_t, ScannerT>::type |
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| 48 | parse(ScannerT const& scan) const |
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| 49 | { |
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| 50 | typedef typename parser_result<self_t, ScannerT>::type result_t; |
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| 51 | typedef typename ScannerT::value_t value_t; |
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| 52 | typedef typename ScannerT::iterator_t iterator_t; |
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| 53 | |
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| 54 | iterator_t const s(scan.first); |
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| 55 | functor_result_t result; |
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| 56 | std::ptrdiff_t len = functor(scan, result); |
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| 57 | |
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| 58 | if (len < 0) |
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| 59 | return scan.no_match(); |
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| 60 | else |
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| 61 | return scan.create_match(std::size_t(len), result, s, scan.first); |
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| 62 | } |
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| 63 | }; |
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| 64 | |
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| 65 | }} // namespace boost::spirit |
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| 66 | |
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| 67 | #endif |
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