| /*============================================================================= |
| 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 |