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/*=============================================================================
Copyright (c) 2002-2003 Joel de Guzman
Copyright (c) 2002-2003 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)
=============================================================================*/
#if !defined(BOOST_SPIRIT_PARSER_CONTEXT_HPP)
#define BOOST_SPIRIT_PARSER_CONTEXT_HPP
///////////////////////////////////////////////////////////////////////////////
namespace boost
{
namespace spirit
{
BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
///////////////////////////////////////////////////////////////////////////
//
// default_parser_context_base class { default context base }
//
///////////////////////////////////////////////////////////////////////////
struct default_parser_context_base
{
template <typename DerivedT>
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<typename ContextT> struct parser_context_linker;
template<typename AttrT = nil_t>
struct parser_context : parser_context_base
{
typedef AttrT attr_t;
typedef default_parser_context_base base_t;
typedef parser_context_linker<parser_context<AttrT> > context_linker_t;
template <typename ParserT>
parser_context(ParserT const&) {}
template <typename ParserT, typename ScannerT>
void
pre_parse(ParserT const&, ScannerT const&) {}
template <typename ResultT, typename ParserT, typename ScannerT>
ResultT&
post_parse(ResultT& hit, ParserT const&, ScannerT const&)
{ return hit; }
};
///////////////////////////////////////////////////////////////////////////
//
// context_aux class
//
// context_aux<ContextT, DerivedT> is a class derived from the
// ContextT's nested base_t::base<DerivedT> 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 <typename ContextT, typename DerivedT>
struct context_aux : public ContextT::base_t::template aux<DerivedT> {};
///////////////////////////////////////////////////////////////////////////
//
// 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<typename ScannerT>
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<typename ContextT>
struct parser_context_linker : public ContextT
{
template <typename ParserT>
parser_context_linker(ParserT const& p)
: ContextT(p) {}
template <typename ParserT, typename ScannerT>
void pre_parse(ParserT const& p, ScannerT const& scan)
{ ContextT::pre_parse(p, scan); }
template <typename ResultT, typename ParserT, typename ScannerT>
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);
BOOST_SPIRIT_CLASSIC_NAMESPACE_END
} // namespace spirit
} // namespace boost
#endif
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