| /*============================================================================= | |
| Copyright (c) 2002-2003 Joel de Guzman | |
| Copyright (c) 2002-2003 Hartmut Kaiser | |
| http://spirit.sourceforge.net/ | |
| Use, modification and distribution is subject to 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) | |
| =============================================================================*/ | |
| #if !defined(BOOST_SPIRIT_TRAVERSE_IPP) | |
| #define BOOST_SPIRIT_TRAVERSE_IPP | |
| /////////////////////////////////////////////////////////////////////////////// | |
| #include <boost/spirit/home/classic/meta/fundamental.hpp> | |
| /////////////////////////////////////////////////////////////////////////////// | |
| namespace boost { namespace spirit { | |
| BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN | |
| /////////////////////////////////////////////////////////////////////////////// | |
| namespace impl | |
| { | |
| template <typename CategoryT> | |
| struct traverse_post_order_return_category; | |
| } // namespace impl | |
| /////////////////////////////////////////////////////////////////////////////// | |
| // | |
| // Environment class for post_order_traversal | |
| // | |
| /////////////////////////////////////////////////////////////////////////////// | |
| template <int Level, int Node, int Index, int LastLeft> | |
| struct traverse_post_order_env { | |
| BOOST_STATIC_CONSTANT(int, level = Level); | |
| BOOST_STATIC_CONSTANT(int, node = Node); | |
| BOOST_STATIC_CONSTANT(int, index = Index); | |
| BOOST_STATIC_CONSTANT(int, lastleft = LastLeft); | |
| }; | |
| /////////////////////////////////////////////////////////////////////////////// | |
| // | |
| // traverse_post_order_return template | |
| // | |
| // This template is a helper for dispatching the calculation of a parser | |
| // type result for a traversal level to the corresponding parser_category | |
| // based specialization. | |
| // | |
| /////////////////////////////////////////////////////////////////////////////// | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| struct traverse_post_order_return { | |
| typedef typename ParserT::parser_category_t parser_category_t; | |
| typedef typename impl::traverse_post_order_return_category<parser_category_t> | |
| ::template result<MetaT, ParserT, EnvT>::type type; | |
| }; | |
| /////////////////////////////////////////////////////////////////////////////// | |
| // | |
| // parser_traversal_..._result templates | |
| // | |
| // These are metafunctions, which calculate the resulting parser type | |
| // for all subparsers and feed these types to the user supplied | |
| // metafunctions to get back the resulting parser type of this traversal | |
| // level. | |
| // | |
| /////////////////////////////////////////////////////////////////////////////// | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| struct parser_traversal_plain_result { | |
| typedef typename MetaT::template plain_result<ParserT, EnvT>::type type; | |
| }; | |
| /////////////////////////////////////////////////////////////////////////////// | |
| template <typename MetaT, typename UnaryT, typename SubjectT, typename EnvT> | |
| struct parser_traversal_unary_result { | |
| typedef typename MetaT | |
| ::template unary_result<UnaryT, SubjectT, EnvT>::type type; | |
| }; | |
| /////////////////////////////////////////////////////////////////////////////// | |
| template <typename MetaT, typename ActionT, typename SubjectT, typename EnvT> | |
| struct parser_traversal_action_result { | |
| typedef typename MetaT | |
| ::template action_result<ActionT, SubjectT, EnvT>::type type; | |
| }; | |
| /////////////////////////////////////////////////////////////////////////////// | |
| template < | |
| typename MetaT, typename BinaryT, typename LeftT, | |
| typename RightT, typename EnvT | |
| > | |
| struct parser_traversal_binary_result { | |
| BOOST_STATIC_CONSTANT(int, | |
| thisnum = (node_count<BinaryT>::value + EnvT::lastleft-1)); | |
| BOOST_STATIC_CONSTANT(int, | |
| leftnum = (node_count<LeftT>::value + EnvT::lastleft-1)); | |
| BOOST_STATIC_CONSTANT(int, | |
| leafnum = (leaf_count<LeftT>::value + EnvT::index)); | |
| typedef parser_traversal_binary_result self_t; | |
| // left traversal environment and resulting parser type | |
| typedef traverse_post_order_env< | |
| (EnvT::level+1), (self_t::leftnum), (EnvT::index), (EnvT::lastleft) | |
| > left_sub_env_t; | |
| typedef typename traverse_post_order_return< | |
| MetaT, LeftT, left_sub_env_t | |
| >::type | |
| left_t; | |
| // right traversal environment and resulting parser type | |
| typedef traverse_post_order_env< | |
| (EnvT::level+1), (self_t::thisnum-1), (self_t::leafnum), (self_t::leftnum+1) | |
| > right_sub_env_t; | |
| typedef typename traverse_post_order_return< | |
| MetaT, RightT, right_sub_env_t | |
| >::type | |
| right_t; | |
| typedef typename MetaT::template binary_result< | |
| BinaryT, left_t, right_t, EnvT | |
| >::type | |
| type; | |
| }; | |
| /////////////////////////////////////////////////////////////////////////////// | |
| namespace impl | |
| { | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // Meta functions, which dispatch the calculation of the return type of | |
| // of the post_order traverse function to the result template of the | |
| // corresponding parser_category based metafunction template. | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename CategoryT> | |
| struct traverse_post_order_return_category; | |
| template <> | |
| struct traverse_post_order_return_category<plain_parser_category> { | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| struct result { | |
| typedef typename parser_traversal_plain_result< | |
| MetaT, ParserT, EnvT | |
| >::type | |
| type; | |
| }; | |
| }; | |
| template <> | |
| struct traverse_post_order_return_category<unary_parser_category> { | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| struct result { | |
| typedef typename parser_traversal_unary_result< | |
| MetaT, ParserT, typename ParserT::subject_t, EnvT | |
| >::type | |
| type; | |
| }; | |
| }; | |
| template <> | |
| struct traverse_post_order_return_category<action_parser_category> { | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| struct result { | |
| typedef typename parser_traversal_action_result< | |
| MetaT, ParserT, typename ParserT::subject_t, EnvT | |
| >::type | |
| type; | |
| }; | |
| }; | |
| template <> | |
| struct traverse_post_order_return_category<binary_parser_category> { | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| struct result { | |
| typedef typename parser_traversal_binary_result< | |
| MetaT, ParserT, typename ParserT::left_t, | |
| typename ParserT::right_t, EnvT | |
| >::type | |
| type; | |
| }; | |
| }; | |
| /////////////////////////////////////////////////////////////////////////// | |
| // | |
| // Post-order parser traversal | |
| // | |
| // The following templates contain the parser_category based code for | |
| // | |
| // - calculating the type of the resulting parser, which is to be | |
| // returned from a level of traversal | |
| // - traversing down the composite parser structure, this traversal | |
| // returnes a new parser object | |
| // | |
| // Both tasks are delegated to the MetaT metafunction supplied by the | |
| // user. | |
| // | |
| /////////////////////////////////////////////////////////////////////////// | |
| template <typename CategoryT> | |
| struct traverse_post_order; | |
| template <> | |
| struct traverse_post_order<plain_parser_category> { | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| struct result { | |
| typedef | |
| typename parser_traversal_plain_result<MetaT, ParserT, EnvT>::type | |
| type; | |
| }; | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| static | |
| typename parser_traversal_plain_result<MetaT, ParserT, EnvT>::type | |
| generate(MetaT const &meta_, ParserT const &parser_, EnvT const &env) | |
| { | |
| return meta_.generate_plain(parser_, env); | |
| } | |
| }; | |
| template <> | |
| struct traverse_post_order<unary_parser_category> { | |
| template < | |
| typename MetaT, typename ParserT, typename SubjectT, typename EnvT | |
| > | |
| struct result { | |
| typedef typename parser_traversal_unary_result< | |
| MetaT, ParserT, SubjectT, EnvT | |
| >::type | |
| type; | |
| }; | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| static | |
| typename parser_traversal_unary_result< | |
| MetaT, ParserT, | |
| typename traverse_post_order_return< | |
| MetaT, typename ParserT::subject_t, EnvT | |
| >::type, | |
| EnvT | |
| >::type | |
| generate(MetaT const &meta_, ParserT const &unary_, EnvT const &env) | |
| { | |
| typedef typename ParserT::subject_t subject_t; | |
| typedef typename subject_t::parser_category_t subject_category_t; | |
| return meta_.generate_unary( | |
| unary_, | |
| traverse_post_order<subject_category_t>::generate(meta_, | |
| unary_.subject(), | |
| traverse_post_order_env< | |
| EnvT::level+1, EnvT::node-1, EnvT::index, EnvT::lastleft | |
| >() | |
| ), | |
| env | |
| ); | |
| } | |
| }; | |
| template <> | |
| struct traverse_post_order<action_parser_category> { | |
| template < | |
| typename MetaT, typename ParserT, typename SubjectT, typename EnvT | |
| > | |
| struct result { | |
| typedef typename parser_traversal_action_result< | |
| MetaT, ParserT, SubjectT, EnvT | |
| >::type | |
| type; | |
| }; | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| static | |
| typename parser_traversal_action_result< | |
| MetaT, ParserT, | |
| typename traverse_post_order_return< | |
| MetaT, typename ParserT::subject_t, EnvT | |
| >::type, | |
| EnvT | |
| >::type | |
| generate(MetaT const &meta_, ParserT const &action_, EnvT const &env) | |
| { | |
| typedef typename ParserT::subject_t subject_t; | |
| typedef typename subject_t::parser_category_t subject_category_t; | |
| return meta_.generate_action( | |
| action_, | |
| traverse_post_order<subject_category_t>::generate(meta_, | |
| action_.subject(), | |
| traverse_post_order_env< | |
| EnvT::level+1, EnvT::node-1, EnvT::index, EnvT::lastleft | |
| >() | |
| ), | |
| env | |
| ); | |
| } | |
| }; | |
| template <> | |
| struct traverse_post_order<binary_parser_category> { | |
| template < | |
| typename MetaT, typename ParserT, typename LeftT, | |
| typename RightT, typename EnvT | |
| > | |
| struct result { | |
| typedef typename parser_traversal_binary_result< | |
| MetaT, ParserT, LeftT, RightT, EnvT | |
| >::type | |
| type; | |
| }; | |
| template <typename MetaT, typename ParserT, typename EnvT> | |
| static | |
| typename parser_traversal_binary_result< | |
| MetaT, ParserT, | |
| typename traverse_post_order_return< | |
| MetaT, typename ParserT::left_t, EnvT | |
| >::type, | |
| typename traverse_post_order_return< | |
| MetaT, typename ParserT::right_t, EnvT | |
| >::type, | |
| EnvT | |
| >::type | |
| generate(MetaT const &meta_, ParserT const &binary_, EnvT const& /*env*/) | |
| { | |
| typedef typename ParserT::left_t left_t; | |
| typedef typename ParserT::right_t right_t; | |
| typedef typename left_t::parser_category_t left_category_t; | |
| typedef typename right_t::parser_category_t right_category_t; | |
| enum { | |
| leftnum = (node_count<left_t>::value + EnvT::lastleft-1), | |
| thisnum = (node_count<ParserT>::value + EnvT::lastleft-1), | |
| rightnum = (thisnum-1), | |
| leafnum = (leaf_count<left_t>::value + EnvT::index) | |
| }; | |
| return meta_.generate_binary( | |
| binary_, | |
| traverse_post_order<left_category_t>::generate( | |
| meta_, binary_.left(), | |
| traverse_post_order_env< | |
| EnvT::level+1, leftnum, EnvT::index, EnvT::lastleft | |
| >() | |
| ), | |
| traverse_post_order<right_category_t>::generate( | |
| meta_, binary_.right(), | |
| traverse_post_order_env< | |
| EnvT::level+1, rightnum, leafnum, leftnum+1 | |
| >() | |
| ), | |
| traverse_post_order_env< | |
| EnvT::level, thisnum, EnvT::index, EnvT::lastleft | |
| >() | |
| ); | |
| } | |
| }; | |
| } // namespace impl | |
| /////////////////////////////////////////////////////////////////////////////// | |
| BOOST_SPIRIT_CLASSIC_NAMESPACE_END | |
| }} // namespace boost::spirit | |
| #endif // !defined(BOOST_SPIRIT_TRAVERSE_IPP) |