| /*============================================================================= | |
| 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 parser_result<self_t, ScannerT>::type result_t; | |
| typedef typename ScannerT::value_t value_t; | |
| 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 |