/*=============================================================================
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Copyright (c) 2002-2003 Joel de Guzman
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Copyright (c) 2002-2003 Juan Carlos Arevalo-Baeza
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http://spirit.sourceforge.net/
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef BOOST_SPIRIT_FUNCTOR_PARSER_HPP
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#define BOOST_SPIRIT_FUNCTOR_PARSER_HPP
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/spirit/home/classic/namespace.hpp>
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#include <boost/spirit/home/classic/core/parser.hpp>
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit {
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BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
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///////////////////////////////////////////////////////////////////////////
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//
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// functor_parser class
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//
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// Once a functor parser has been defined, you can build a real
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// parser from it by passing it to this class as the template
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// parameter.
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//
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///////////////////////////////////////////////////////////////////////////
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template < class FunctorT >
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struct functor_parser : public parser<functor_parser<FunctorT> >
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{
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FunctorT functor;
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functor_parser(): functor() {}
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functor_parser(FunctorT const& functor_): functor(functor_) {}
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typedef typename FunctorT::result_t functor_result_t;
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typedef functor_parser<FunctorT> self_t;
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template <typename ScannerT>
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struct result
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{
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typedef typename match_result<ScannerT, functor_result_t>::type
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type;
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};
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template <typename ScannerT>
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typename parser_result<self_t, ScannerT>::type
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parse(ScannerT const& scan) const
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{
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typedef typename ScannerT::iterator_t iterator_t;
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iterator_t const s(scan.first);
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functor_result_t functor_result;
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std::ptrdiff_t len = functor(scan, functor_result);
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if (len < 0)
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return scan.no_match();
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else
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return scan.create_match(std::size_t(len), functor_result, s, scan.first);
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}
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};
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BOOST_SPIRIT_CLASSIC_NAMESPACE_END
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}} // namespace BOOST_SPIRIT_CLASSIC_NS
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#endif
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