| /*============================================================================= | |
| Copyright (c) 2003 Hartmut Kaiser | |
| 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_SELECT_HPP | |
| #define BOOST_SPIRIT_SELECT_HPP | |
| #include <boost/preprocessor/repeat.hpp> | |
| #include <boost/preprocessor/enum.hpp> | |
| #include <boost/preprocessor/enum_params.hpp> | |
| #include <boost/preprocessor/enum_params_with_defaults.hpp> | |
| #include <boost/preprocessor/inc.hpp> | |
| #include <boost/preprocessor/cat.hpp> | |
| #include <boost/preprocessor/facilities/intercept.hpp> | |
| #include <boost/spirit/home/classic/namespace.hpp> | |
| #include <boost/spirit/home/classic/core/parser.hpp> | |
| #include <boost/spirit/home/classic/phoenix/tuples.hpp> | |
| /////////////////////////////////////////////////////////////////////////////// | |
| // | |
| // Spirit predefined maximum number of possible embedded select_p parsers. | |
| // It should NOT be greater than PHOENIX_LIMIT! | |
| // | |
| /////////////////////////////////////////////////////////////////////////////// | |
| #if !defined(BOOST_SPIRIT_SELECT_LIMIT) | |
| #define BOOST_SPIRIT_SELECT_LIMIT PHOENIX_LIMIT | |
| #endif // !defined(BOOST_SPIRIT_SELECT_LIMIT) | |
| /////////////////////////////////////////////////////////////////////////////// | |
| // | |
| // ensure BOOST_SPIRIT_SELECT_LIMIT <= PHOENIX_LIMIT and | |
| // BOOST_SPIRIT_SELECT_LIMIT > 0 | |
| // BOOST_SPIRIT_SELECT_LIMIT <= 15 | |
| // | |
| // [Pushed this down a little to make CW happy with BOOST_STATIC_ASSERT] | |
| // [Otherwise, it complains: 'boost_static_assert_test_42' redefined] | |
| // | |
| /////////////////////////////////////////////////////////////////////////////// | |
| BOOST_STATIC_ASSERT(BOOST_SPIRIT_SELECT_LIMIT <= PHOENIX_LIMIT); | |
| BOOST_STATIC_ASSERT(BOOST_SPIRIT_SELECT_LIMIT > 0); | |
| BOOST_STATIC_ASSERT(BOOST_SPIRIT_SELECT_LIMIT <= 15); | |
| /////////////////////////////////////////////////////////////////////////////// | |
| // | |
| // Calculate the required amount of tuple members rounded up to the nearest | |
| // integer dividable by 3 | |
| // | |
| /////////////////////////////////////////////////////////////////////////////// | |
| #if BOOST_SPIRIT_SELECT_LIMIT > 12 | |
| #define BOOST_SPIRIT_SELECT_LIMIT_A 15 | |
| #elif BOOST_SPIRIT_SELECT_LIMIT > 9 | |
| #define BOOST_SPIRIT_SELECT_LIMIT_A 12 | |
| #elif BOOST_SPIRIT_SELECT_LIMIT > 6 | |
| #define BOOST_SPIRIT_SELECT_LIMIT_A 9 | |
| #elif BOOST_SPIRIT_SELECT_LIMIT > 3 | |
| #define BOOST_SPIRIT_SELECT_LIMIT_A 6 | |
| #else | |
| #define BOOST_SPIRIT_SELECT_LIMIT_A 3 | |
| #endif | |
| /////////////////////////////////////////////////////////////////////////////// | |
| namespace boost { namespace spirit { | |
| BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN | |
| /////////////////////////////////////////////////////////////////////////////// | |
| // | |
| // The select_default_no_fail and select_default_fail structs are used to | |
| // distinguish two different behaviours for the select_parser in case that not | |
| // any of the given sub-parsers match. | |
| // | |
| // If the select_parser is used with the select_default_no_fail behaviour, | |
| // then in case of no matching sub-parser the whole select_parser returns an | |
| // empty match and the value -1. | |
| // | |
| // If the select_parser is used with the select_default_fail behaviour, then | |
| // in case of no matching sub-parser the whole select_parser fails to match at | |
| // all. | |
| // | |
| /////////////////////////////////////////////////////////////////////////////// | |
| struct select_default_no_fail {}; | |
| struct select_default_fail {}; | |
| BOOST_SPIRIT_CLASSIC_NAMESPACE_END | |
| }} // namespace BOOST_SPIRIT_CLASSIC_NS | |
| /////////////////////////////////////////////////////////////////////////////// | |
| #include <boost/spirit/home/classic/dynamic/impl/select.ipp> | |
| /////////////////////////////////////////////////////////////////////////////// | |
| namespace boost { namespace spirit { | |
| BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN | |
| /////////////////////////////////////////////////////////////////////////////// | |
| template <typename TupleT, typename BehaviourT, typename T> | |
| struct select_parser | |
| : public parser<select_parser<TupleT, BehaviourT, T> > | |
| { | |
| typedef select_parser<TupleT, BehaviourT, T> self_t; | |
| select_parser(TupleT const &t_) | |
| : t(t_) | |
| {} | |
| template <typename ScannerT> | |
| struct result | |
| { | |
| typedef typename match_result<ScannerT, 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; | |
| if (!scan.at_end()) { | |
| return impl::parse_tuple_element< | |
| TupleT::length, result_t, TupleT, BehaviourT>::do_(t, scan); | |
| } | |
| return impl::select_match_gen<result_t, BehaviourT>::do_(scan); | |
| } | |
| TupleT const t; | |
| }; | |
| /////////////////////////////////////////////////////////////////////////////// | |
| template <typename BehaviourT, typename T = int> | |
| struct select_parser_gen { | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // This generates different select_parser_gen::operator()() functions with | |
| // an increasing number of parser parameters: | |
| // | |
| // template <typename ParserT0, ...> | |
| // select_parser< | |
| // ::phoenix::tuple< | |
| // typename impl::as_embedded_parser<ParserT0>::type, | |
| // ... | |
| // >, | |
| // BehaviourT, | |
| // T | |
| // > | |
| // operator()(ParserT0 const &p0, ...) const | |
| // { | |
| // typedef impl::as_embedded_parser<ParserT0> parser_t0; | |
| // ... | |
| // | |
| // typedef ::phoenix::tuple< | |
| // parser_t0::type, | |
| // ... | |
| // > tuple_t; | |
| // typedef select_parser<tuple_t, BehaviourT, T> result_t; | |
| // | |
| // return result_t(tuple_t( | |
| // parser_t0::convert(p0), | |
| // ... | |
| // )); | |
| // } | |
| // | |
| // The number of generated functions depends on the maximum tuple member | |
| // limit defined by the PHOENIX_LIMIT pp constant. | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| #define BOOST_SPIRIT_SELECT_EMBEDDED(z, N, _) \ | |
| typename impl::as_embedded_parser<BOOST_PP_CAT(ParserT, N)>::type \ | |
| /**/ | |
| #define BOOST_SPIRIT_SELECT_EMBEDDED_TYPEDEF(z, N, _) \ | |
| typedef impl::as_embedded_parser<BOOST_PP_CAT(ParserT, N)> \ | |
| BOOST_PP_CAT(parser_t, N); \ | |
| /**/ | |
| #define BOOST_SPIRIT_SELECT_CONVERT(z, N, _) \ | |
| BOOST_PP_CAT(parser_t, N)::convert(BOOST_PP_CAT(p, N)) \ | |
| /**/ | |
| #define BOOST_SPIRIT_SELECT_PARSER(z, N, _) \ | |
| template < \ | |
| BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_INC(N), typename ParserT) \ | |
| > \ | |
| select_parser< \ | |
| ::phoenix::tuple< \ | |
| BOOST_PP_ENUM_ ## z(BOOST_PP_INC(N), \ | |
| BOOST_SPIRIT_SELECT_EMBEDDED, _) \ | |
| >, \ | |
| BehaviourT, \ | |
| T \ | |
| > \ | |
| operator()( \ | |
| BOOST_PP_ENUM_BINARY_PARAMS_Z(z, BOOST_PP_INC(N), \ | |
| ParserT, const &p) \ | |
| ) const \ | |
| { \ | |
| BOOST_PP_REPEAT_ ## z(BOOST_PP_INC(N), \ | |
| BOOST_SPIRIT_SELECT_EMBEDDED_TYPEDEF, _) \ | |
| \ | |
| typedef ::phoenix::tuple< \ | |
| BOOST_PP_ENUM_BINARY_PARAMS_Z(z, BOOST_PP_INC(N), \ | |
| typename parser_t, ::type BOOST_PP_INTERCEPT) \ | |
| > tuple_t; \ | |
| typedef select_parser<tuple_t, BehaviourT, T> result_t; \ | |
| \ | |
| return result_t(tuple_t( \ | |
| BOOST_PP_ENUM_ ## z(BOOST_PP_INC(N), \ | |
| BOOST_SPIRIT_SELECT_CONVERT, _) \ | |
| )); \ | |
| } \ | |
| /**/ | |
| BOOST_PP_REPEAT(BOOST_SPIRIT_SELECT_LIMIT_A, | |
| BOOST_SPIRIT_SELECT_PARSER, _) | |
| #undef BOOST_SPIRIT_SELECT_PARSER | |
| #undef BOOST_SPIRIT_SELECT_CONVERT | |
| #undef BOOST_SPIRIT_SELECT_EMBEDDED_TYPEDEF | |
| #undef BOOST_SPIRIT_SELECT_EMBEDDED | |
| /////////////////////////////////////////////////////////////////////////// | |
| }; | |
| /////////////////////////////////////////////////////////////////////////////// | |
| // | |
| // Predefined parser generator helper objects | |
| // | |
| /////////////////////////////////////////////////////////////////////////////// | |
| select_parser_gen<select_default_no_fail> const select_p = | |
| select_parser_gen<select_default_no_fail>(); | |
| select_parser_gen<select_default_fail> const select_fail_p = | |
| select_parser_gen<select_default_fail>(); | |
| #undef BOOST_SPIRIT_SELECT_LIMIT_A | |
| /////////////////////////////////////////////////////////////////////////////// | |
| BOOST_SPIRIT_CLASSIC_NAMESPACE_END | |
| }} // namespace BOOST_SPIRIT_CLASSIC_NS | |
| #endif // BOOST_SPIRIT_SELECT_HPP |