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- /*=============================================================================
- Copyright (c) 2002-2003 Joel de Guzman
- Copyright (c) 2002-2003 Juan Carlos Arevalo-Baeza
- http://spirit.sourceforge.net/
- 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_SPIRIT_FUNCTOR_PARSER_HPP
- #define BOOST_SPIRIT_FUNCTOR_PARSER_HPP
- ///////////////////////////////////////////////////////////////////////////////
- #include <boost/spirit/home/classic/namespace.hpp>
- #include <boost/spirit/home/classic/core/parser.hpp>
- ///////////////////////////////////////////////////////////////////////////////
- namespace boost { namespace spirit {
- BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
- ///////////////////////////////////////////////////////////////////////////
- //
- // functor_parser class
- //
- // Once a functor parser has been defined, you can build a real
- // parser from it by passing it to this class as the template
- // parameter.
- //
- ///////////////////////////////////////////////////////////////////////////
- template < class FunctorT >
- struct functor_parser : public parser<functor_parser<FunctorT> >
- {
- FunctorT functor;
- functor_parser(): functor() {}
- functor_parser(FunctorT const& functor_): functor(functor_) {}
- typedef typename FunctorT::result_t functor_result_t;
- typedef functor_parser<FunctorT> self_t;
- template <typename ScannerT>
- struct result
- {
- typedef typename match_result<ScannerT, functor_result_t>::type
- type;
- };
- template <typename ScannerT>
- typename parser_result<self_t, ScannerT>::type
- parse(ScannerT const& scan) const
- {
- typedef typename ScannerT::iterator_t iterator_t;
- iterator_t const s(scan.first);
- functor_result_t functor_result;
- std::ptrdiff_t len = functor(scan, functor_result);
- if (len < 0)
- return scan.no_match();
- else
- return scan.create_match(std::size_t(len), functor_result, s, scan.first);
- }
- };
- BOOST_SPIRIT_CLASSIC_NAMESPACE_END
- }} // namespace BOOST_SPIRIT_CLASSIC_NS
- #endif
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