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Wave: a Standard conformant C++ preprocessor library

, 10 Jan 2004
Describes a free and fully Standard conformant C++ preprocessor library
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/*=============================================================================
    A Standard compliant C++ preprocessor

    Copyright (c) 2001-2004 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)

    See Copyright.txt for full acknowledgements.
=============================================================================*/

#if !defined(CPP_PREDEF_MACROS_GEN_HPP_CADB6D2C_76A4_4988_83E1_EFFC6902B9A2_INCLUDED)
#define CPP_PREDEF_MACROS_GEN_HPP_CADB6D2C_76A4_4988_83E1_EFFC6902B9A2_INCLUDED

#include <boost/spirit/tree/parse_tree.hpp>

#include "wave/lex_iterator.hpp"

///////////////////////////////////////////////////////////////////////////////
namespace wave {
namespace grammars {

///////////////////////////////////////////////////////////////////////////////
//  
//  store parser_id's of all rules of the predefined_macros_grammar here 
//  for later access
//
///////////////////////////////////////////////////////////////////////////////
struct predefined_macros_grammar_rule_ids {
    std::size_t plain_define_id;       // #define
    std::size_t macro_parameters_id;
    std::size_t macro_definition_id;
};

///////////////////////////////////////////////////////////////////////////////
//  
//  predefined_macros_grammar_gen template class
//
//      This template helps separating the compilation of the 
//      predefined_macros_grammar class from the compilation of the 
//      main pp_iterator. This is done to safe compilation time.
//
//      This class helps parsing command line given macro definitions in a
//      similar way, as macros are parsed by the cpp_grammar class.
//
///////////////////////////////////////////////////////////////////////////////

template <typename TokenT>
struct predefined_macros_grammar_gen
{
    typedef WAVE_LEXER_NS::lex_iterator<TokenT>  iterator_t;

//  the parser_id's of all rules of the cpp_grammar are stored here
//  note: these are valid only after the first call to parse_cpp_grammar
    static predefined_macros_grammar_rule_ids rule_ids;

//  parse the cpp_grammar and return the resulting parse tree    
    static boost::spirit::tree_parse_info<iterator_t> 
    parse_predefined_macro (iterator_t const &first, iterator_t const &last);
};

///////////////////////////////////////////////////////////////////////////////
//  definitions of the static members
template <typename TokenT>
predefined_macros_grammar_rule_ids 
    predefined_macros_grammar_gen<TokenT>::rule_ids;

///////////////////////////////////////////////////////////////////////////////
}   // namespace grammars
}   // namespace wave

#endif // !defined(CPP_PREDEF_MACROS_GEN_HPP_CADB6D2C_76A4_4988_83E1_EFFC6902B9A2_INCLUDED)

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About the Author

Hartmut Kaiser
United States United States
Actively involved in Boost and the development of the Spirit parser construction framework.

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