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393 lines
13 KiB
393 lines
13 KiB
/*============================================================================= |
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Copyright (c) 2002-2003 Joel de Guzman |
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Copyright (c) 2002-2003 Hartmut Kaiser |
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http://spirit.sourceforge.net/ |
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Use, modification and distribution is subject to the Boost Software |
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License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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http://www.boost.org/LICENSE_1_0.txt) |
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=============================================================================*/ |
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#if !defined(BOOST_SPIRIT_TRAVERSE_IPP) |
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#define BOOST_SPIRIT_TRAVERSE_IPP |
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/////////////////////////////////////////////////////////////////////////////// |
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#include <boost/spirit/home/classic/meta/fundamental.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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namespace impl |
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{ |
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template <typename CategoryT> |
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struct traverse_post_order_return_category; |
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} // namespace impl |
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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// Environment class for post_order_traversal |
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// |
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/////////////////////////////////////////////////////////////////////////////// |
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template <int Level, int Node, int Index, int LastLeft> |
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struct traverse_post_order_env { |
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BOOST_STATIC_CONSTANT(int, level = Level); |
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BOOST_STATIC_CONSTANT(int, node = Node); |
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BOOST_STATIC_CONSTANT(int, index = Index); |
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BOOST_STATIC_CONSTANT(int, lastleft = LastLeft); |
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}; |
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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// traverse_post_order_return template |
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// |
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// This template is a helper for dispatching the calculation of a parser |
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// type result for a traversal level to the corresponding parser_category |
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// based specialization. |
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// |
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/////////////////////////////////////////////////////////////////////////////// |
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template <typename MetaT, typename ParserT, typename EnvT> |
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struct traverse_post_order_return { |
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typedef typename ParserT::parser_category_t parser_category_t; |
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typedef typename impl::traverse_post_order_return_category<parser_category_t> |
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::template result<MetaT, ParserT, EnvT>::type type; |
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}; |
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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// parser_traversal_..._result templates |
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// |
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// These are metafunctions, which calculate the resulting parser type |
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// for all subparsers and feed these types to the user supplied |
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// metafunctions to get back the resulting parser type of this traversal |
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// level. |
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// |
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/////////////////////////////////////////////////////////////////////////////// |
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template <typename MetaT, typename ParserT, typename EnvT> |
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struct parser_traversal_plain_result { |
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typedef typename MetaT::template plain_result<ParserT, EnvT>::type type; |
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}; |
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/////////////////////////////////////////////////////////////////////////////// |
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template <typename MetaT, typename UnaryT, typename SubjectT, typename EnvT> |
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struct parser_traversal_unary_result { |
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typedef typename MetaT |
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::template unary_result<UnaryT, SubjectT, EnvT>::type type; |
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}; |
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/////////////////////////////////////////////////////////////////////////////// |
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template <typename MetaT, typename ActionT, typename SubjectT, typename EnvT> |
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struct parser_traversal_action_result { |
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typedef typename MetaT |
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::template action_result<ActionT, SubjectT, EnvT>::type type; |
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}; |
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/////////////////////////////////////////////////////////////////////////////// |
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template < |
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typename MetaT, typename BinaryT, typename LeftT, |
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typename RightT, typename EnvT |
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> |
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struct parser_traversal_binary_result { |
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BOOST_STATIC_CONSTANT(int, |
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thisnum = (node_count<BinaryT>::value + EnvT::lastleft-1)); |
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BOOST_STATIC_CONSTANT(int, |
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leftnum = (node_count<LeftT>::value + EnvT::lastleft-1)); |
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BOOST_STATIC_CONSTANT(int, |
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leafnum = (leaf_count<LeftT>::value + EnvT::index)); |
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typedef parser_traversal_binary_result self_t; |
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// left traversal environment and resulting parser type |
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typedef traverse_post_order_env< |
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(EnvT::level+1), (self_t::leftnum), (EnvT::index), (EnvT::lastleft) |
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> left_sub_env_t; |
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typedef typename traverse_post_order_return< |
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MetaT, LeftT, left_sub_env_t |
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>::type |
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left_t; |
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// right traversal environment and resulting parser type |
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typedef traverse_post_order_env< |
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(EnvT::level+1), (self_t::thisnum-1), (self_t::leafnum), (self_t::leftnum+1) |
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> right_sub_env_t; |
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typedef typename traverse_post_order_return< |
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MetaT, RightT, right_sub_env_t |
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>::type |
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right_t; |
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typedef typename MetaT::template binary_result< |
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BinaryT, left_t, right_t, EnvT |
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>::type |
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type; |
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}; |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace impl |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// |
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// Meta functions, which dispatch the calculation of the return type of |
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// of the post_order traverse function to the result template of the |
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// corresponding parser_category based metafunction template. |
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// |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename CategoryT> |
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struct traverse_post_order_return_category; |
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template <> |
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struct traverse_post_order_return_category<plain_parser_category> { |
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template <typename MetaT, typename ParserT, typename EnvT> |
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struct result { |
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typedef typename parser_traversal_plain_result< |
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MetaT, ParserT, EnvT |
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>::type |
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type; |
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}; |
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}; |
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template <> |
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struct traverse_post_order_return_category<unary_parser_category> { |
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template <typename MetaT, typename ParserT, typename EnvT> |
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struct result { |
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typedef typename parser_traversal_unary_result< |
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MetaT, ParserT, typename ParserT::subject_t, EnvT |
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>::type |
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type; |
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}; |
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}; |
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template <> |
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struct traverse_post_order_return_category<action_parser_category> { |
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template <typename MetaT, typename ParserT, typename EnvT> |
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struct result { |
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typedef typename parser_traversal_action_result< |
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MetaT, ParserT, typename ParserT::subject_t, EnvT |
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>::type |
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type; |
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}; |
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}; |
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template <> |
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struct traverse_post_order_return_category<binary_parser_category> { |
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template <typename MetaT, typename ParserT, typename EnvT> |
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struct result { |
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typedef typename parser_traversal_binary_result< |
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MetaT, ParserT, typename ParserT::left_t, |
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typename ParserT::right_t, EnvT |
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>::type |
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type; |
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}; |
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}; |
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/////////////////////////////////////////////////////////////////////////// |
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// |
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// Post-order parser traversal |
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// |
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// The following templates contain the parser_category based code for |
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// |
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// - calculating the type of the resulting parser, which is to be |
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// returned from a level of traversal |
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// - traversing down the composite parser structure, this traversal |
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// returnes a new parser object |
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// |
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// Both tasks are delegated to the MetaT metafunction supplied by the |
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// user. |
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// |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename CategoryT> |
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struct traverse_post_order; |
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template <> |
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struct traverse_post_order<plain_parser_category> { |
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template <typename MetaT, typename ParserT, typename EnvT> |
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struct result { |
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typedef |
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typename parser_traversal_plain_result<MetaT, ParserT, EnvT>::type |
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type; |
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}; |
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template <typename MetaT, typename ParserT, typename EnvT> |
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static |
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typename parser_traversal_plain_result<MetaT, ParserT, EnvT>::type |
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generate(MetaT const &meta_, ParserT const &parser_, EnvT const &env) |
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{ |
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return meta_.generate_plain(parser_, env); |
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} |
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}; |
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template <> |
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struct traverse_post_order<unary_parser_category> { |
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template < |
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typename MetaT, typename ParserT, typename SubjectT, typename EnvT |
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> |
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struct result { |
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typedef typename parser_traversal_unary_result< |
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MetaT, ParserT, SubjectT, EnvT |
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>::type |
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type; |
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}; |
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template <typename MetaT, typename ParserT, typename EnvT> |
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static |
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typename parser_traversal_unary_result< |
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MetaT, ParserT, |
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typename traverse_post_order_return< |
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MetaT, typename ParserT::subject_t, EnvT |
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>::type, |
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EnvT |
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>::type |
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generate(MetaT const &meta_, ParserT const &unary_, EnvT const &env) |
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{ |
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typedef typename ParserT::subject_t subject_t; |
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typedef typename subject_t::parser_category_t subject_category_t; |
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return meta_.generate_unary( |
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unary_, |
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traverse_post_order<subject_category_t>::generate(meta_, |
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unary_.subject(), |
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traverse_post_order_env< |
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EnvT::level+1, EnvT::node-1, EnvT::index, EnvT::lastleft |
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>() |
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), |
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env |
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); |
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} |
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}; |
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template <> |
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struct traverse_post_order<action_parser_category> { |
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template < |
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typename MetaT, typename ParserT, typename SubjectT, typename EnvT |
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> |
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struct result { |
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typedef typename parser_traversal_action_result< |
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MetaT, ParserT, SubjectT, EnvT |
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>::type |
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type; |
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}; |
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template <typename MetaT, typename ParserT, typename EnvT> |
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static |
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typename parser_traversal_action_result< |
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MetaT, ParserT, |
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typename traverse_post_order_return< |
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MetaT, typename ParserT::subject_t, EnvT |
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>::type, |
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EnvT |
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>::type |
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generate(MetaT const &meta_, ParserT const &action_, EnvT const &env) |
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{ |
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typedef typename ParserT::subject_t subject_t; |
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typedef typename subject_t::parser_category_t subject_category_t; |
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return meta_.generate_action( |
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action_, |
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traverse_post_order<subject_category_t>::generate(meta_, |
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action_.subject(), |
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traverse_post_order_env< |
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EnvT::level+1, EnvT::node-1, EnvT::index, EnvT::lastleft |
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>() |
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), |
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env |
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); |
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} |
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}; |
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template <> |
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struct traverse_post_order<binary_parser_category> { |
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template < |
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typename MetaT, typename ParserT, typename LeftT, |
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typename RightT, typename EnvT |
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> |
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struct result { |
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typedef typename parser_traversal_binary_result< |
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MetaT, ParserT, LeftT, RightT, EnvT |
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>::type |
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type; |
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}; |
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template <typename MetaT, typename ParserT, typename EnvT> |
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static |
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typename parser_traversal_binary_result< |
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MetaT, ParserT, |
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typename traverse_post_order_return< |
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MetaT, typename ParserT::left_t, EnvT |
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>::type, |
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typename traverse_post_order_return< |
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MetaT, typename ParserT::right_t, EnvT |
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>::type, |
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EnvT |
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>::type |
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generate(MetaT const &meta_, ParserT const &binary_, EnvT const& /*env*/) |
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{ |
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typedef typename ParserT::left_t left_t; |
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typedef typename ParserT::right_t right_t; |
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typedef typename left_t::parser_category_t left_category_t; |
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typedef typename right_t::parser_category_t right_category_t; |
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enum { |
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leftnum = (node_count<left_t>::value + EnvT::lastleft-1), |
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thisnum = (node_count<ParserT>::value + EnvT::lastleft-1), |
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rightnum = (thisnum-1), |
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leafnum = (leaf_count<left_t>::value + EnvT::index) |
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}; |
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return meta_.generate_binary( |
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binary_, |
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traverse_post_order<left_category_t>::generate( |
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meta_, binary_.left(), |
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traverse_post_order_env< |
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EnvT::level+1, leftnum, EnvT::index, EnvT::lastleft |
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>() |
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), |
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traverse_post_order<right_category_t>::generate( |
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meta_, binary_.right(), |
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traverse_post_order_env< |
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EnvT::level+1, rightnum, leafnum, leftnum+1 |
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>() |
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), |
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traverse_post_order_env< |
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EnvT::level, thisnum, EnvT::index, EnvT::lastleft |
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>() |
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); |
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} |
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}; |
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} // namespace impl |
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/////////////////////////////////////////////////////////////////////////////// |
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BOOST_SPIRIT_CLASSIC_NAMESPACE_END |
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}} // namespace boost::spirit |
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#endif // !defined(BOOST_SPIRIT_TRAVERSE_IPP)
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