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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\spirit\core\non_terminal\parser_context.hpp
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/*============================================================================= 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_PARSER_CONTEXT_HPP) #define BOOST_SPIRIT_PARSER_CONTEXT_HPP /////////////////////////////////////////////////////////////////////////////// namespace boost { namespace spirit { /////////////////////////////////////////////////////////////////////////// // // default_parser_context_base class { default context base } // /////////////////////////////////////////////////////////////////////////// struct default_parser_context_base { template
struct aux {}; }; /////////////////////////////////////////////////////////////////////////// // // parser_context_base class { base class of all context classes } // /////////////////////////////////////////////////////////////////////////// struct parser_context_base {}; /////////////////////////////////////////////////////////////////////////// // // parser_context class { default context } // /////////////////////////////////////////////////////////////////////////// struct nil_t; template
struct parser_context_linker; template
struct parser_context : parser_context_base { typedef AttrT attr_t; typedef default_parser_context_base base_t; typedef parser_context_linker
> context_linker_t; template
parser_context(ParserT const&) {} template
void pre_parse(ParserT const&, ScannerT const&) {} template
ResultT& post_parse(ResultT& hit, ParserT const&, ScannerT const&) { return hit; } }; /////////////////////////////////////////////////////////////////////////// // // context_aux class // // context_aux
is a class derived from the // ContextT's nested base_t::base
template class. (see // default_parser_context_base::aux for an example). // // Basically, this class provides ContextT dependent optional // functionality to the derived class DerivedT through the CRTP // idiom (Curiously recurring template pattern). // /////////////////////////////////////////////////////////////////////////// template
struct context_aux : public ContextT::base_t::template aux
{}; /////////////////////////////////////////////////////////////////////////// // // parser_scanner_linker and parser_scanner_linker classes // { helper templates for the rule extensibility } // // This classes can be 'overloaded' (defined elsewhere), to plug // in additional functionality into the non-terminal parsing process. // /////////////////////////////////////////////////////////////////////////// #if !defined(BOOST_SPIRIT_PARSER_SCANNER_LINKER_DEFINED) #define BOOST_SPIRIT_PARSER_SCANNER_LINKER_DEFINED template
struct parser_scanner_linker : public ScannerT { parser_scanner_linker(ScannerT const scan_) : ScannerT(scan_) {} }; #endif // !defined(BOOST_SPIRIT_PARSER_SCANNER_LINKER_DEFINED) ////////////////////////////////// #if !defined(BOOST_SPIRIT_PARSER_CONTEXT_LINKER_DEFINED) #define BOOST_SPIRIT_PARSER_CONTEXT_LINKER_DEFINED template
struct parser_context_linker : public ContextT { template
parser_context_linker(ParserT const& p) : ContextT(p) {} template
void pre_parse(ParserT const& p, ScannerT const& scan) { ContextT::pre_parse(p, scan); } template
ResultT& post_parse(ResultT& hit, ParserT const& p, ScannerT const& scan) { return ContextT::post_parse(hit, p, scan); } }; #endif // !defined(BOOST_SPIRIT_PARSER_CONTEXT_LINKER_DEFINED) /////////////////////////////////////////////////////////////////////////// // // BOOST_SPIRIT_CONTEXT_PARSE helper macro // // The original implementation uses a template class. However, we // need to lessen the template instantiation depth to help inferior // compilers that sometimes choke on deep template instantiations. // The objective is to avoid code redundancy. A macro, in this case // is an obvious solution. Sigh! // // WARNING: INTERNAL USE ONLY. NOT FOR PUBLIC CONSUMPTION. // /////////////////////////////////////////////////////////////////////////// #define BOOST_SPIRIT_CONTEXT_PARSE(scan, this_, scanner_t, context_t, result_t) \ scanner_t scan_wrap(scan); \ context_t context_wrap(this_); \ context_wrap.pre_parse(this_, scan_wrap); \ result_t hit = parse_main(scan); \ return context_wrap.post_parse(hit, this_, scan_wrap); } // namespace spirit } // namespace boost #endif
parser_context.hpp
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