cpp_context.hpp

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// change and ask for maximal possible include nesting depth
    void set_max_include_nesting_depth(iter_size_type new_depth)
        { iter_ctxs.set_max_include_nesting_depth(new_depth); }
    iter_size_type get_max_include_nesting_depth() const
        { return iter_ctxs.get_max_include_nesting_depth(); }

// access the policies
    hook_policy_type &get_hooks() { return hooks; }

// return the directory of the currently preprocessed file
    boost::filesystem::path get_current_directory() const
        { return includes.get_current_directory(); }
        
#if !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
protected:
    friend class boost::wave::pp_iterator<
        boost::wave::context<IteratorT, lexer_type, InputPolicyT, HooksT> >;
    friend class boost::wave::impl::pp_iterator_functor<
        boost::wave::context<IteratorT, lexer_type, InputPolicyT, HooksT> >;
#endif
    
// maintain include paths (helper functions)
    bool find_include_file (std::string &s, std::string &d, bool is_system, 
        char const *current_file) const
    { return includes.find_include_file(s, d, is_system, current_file); }
    void set_current_directory(char const *path_) 
        { includes.set_current_directory(path_); }
        
// conditional compilation contexts
    bool get_if_block_status() const { return ifblocks.get_status(); }
    bool get_if_block_some_part_status() const 
        { return ifblocks.get_some_part_status(); } 
    bool get_enclosing_if_block_status() const
        { return ifblocks.get_enclosing_status(); }
    void enter_if_block(bool new_status) 
        { ifblocks.enter_if_block(new_status); }
    bool enter_elif_block(bool new_status) 
        { return ifblocks.enter_elif_block(new_status); }
    bool enter_else_block() { return ifblocks.enter_else_block(); }
    bool exit_if_block() { return ifblocks.exit_if_block(); }
    typename boost::wave::util::if_block_stack::size_type get_if_block_depth() const 
        { return ifblocks.get_if_block_depth(); }

// stack of iteration contexts
    iteration_ptr_type pop_iteration_context()
        { iteration_ptr_type top = iter_ctxs.top(); iter_ctxs.pop(); return top; }
    void push_iteration_context(position_type const &act_pos, iteration_ptr_type iter_ctx)
        { iter_ctxs.push(act_pos, iter_ctx); }

    position_type &get_main_pos() { return macros.get_main_pos(); }
    
///////////////////////////////////////////////////////////////////////////////
//
//  expand_tokensequence(): 
//      expands all macros contained in a given token sequence, handles '##' 
//      and '#' pp operators and re-scans the resulting sequence 
//      (essentially pre-processes the token sequence).
//
//      The expand_undefined parameter is true during macro expansion inside
//      a C++ expression given for a #if or #elif statement. 
//
///////////////////////////////////////////////////////////////////////////////
    template <typename IteratorT2>
    token_type expand_tokensequence(IteratorT2 &first_, IteratorT2 const &last_, 
        token_sequence_type &pending, token_sequence_type &expanded, 
        bool expand_undefined = false)
    {
        return macros.expand_tokensequence(first_, last_, pending, expanded, 
            expand_undefined);
    }

    template <typename IteratorT2>
    void expand_whole_tokensequence(IteratorT2 &first_, IteratorT2 const &last_, 
        token_sequence_type &expanded, bool expand_undefined = true)
    {
        macros.expand_whole_tokensequence(expanded, first_, last_, 
            expand_undefined);

    // remove any contained placeholder
        boost::wave::util::impl::remove_placeholders(expanded);
    }

public:
#if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0
// support for #pragma once
// maintain the real name of the current preprocessed file
    void set_current_filename(char const *real_name)
        { current_filename = real_name; }
    std::string const &get_current_filename() const 
        { return current_filename; }

// maintain the list of known headers containing #pragma once 
    bool has_pragma_once(std::string const &filename_)
        { return includes.has_pragma_once(filename_); }
    bool add_pragma_once_header(std::string const &filename_,
            std::string const& guard_name = "__BOOST_WAVE_PRAGMA_ONCE__")
        { return includes.add_pragma_once_header(filename_, guard_name); }
#endif 

// forwarding functions for the context policy hooks    
    template <typename ContainerT>
    bool interpret_pragma(ContainerT &pending, token_type const &option, 
        ContainerT const &values, token_type const &act_token)
    {
        return hooks.interpret_pragma(*this, pending, option, values, act_token);
    }
    
#if BOOST_WAVE_SERIALIZATION != 0
public:
    BOOST_STATIC_CONSTANT(unsigned int, version = 0x10);
    BOOST_STATIC_CONSTANT(unsigned int, version_mask = 0x0f);

private:
    friend class boost::serialization::access;
    template<class Archive>
    void save(Archive & ar, const unsigned int version) const
    {
        typedef typename token_type::string_type string_type;
        
        string_type cfg(BOOST_PP_STRINGIZE(BOOST_WAVE_CONFIG));
        string_type kwd(BOOST_WAVE_PRAGMA_KEYWORD);
        string_type strtype(BOOST_PP_STRINGIZE((BOOST_WAVE_STRINGTYPE)));
        ar & cfg;
        ar & kwd;
        ar & strtype;
        
        ar & language;
        ar & macros;
        ar & includes;
    }
    template<class Archive>
    void load(Archive & ar, const unsigned int loaded_version)
    {
        if (version != (loaded_version & ~version_mask)) {
            BOOST_WAVE_THROW(preprocess_exception, incompatible_config, 
                "cpp_context state version", get_main_pos());
        }
        
        // check compatibility of the stored information
        typedef typename token_type::string_type string_type;
        string_type config, pragma_keyword, string_type_str;
        
        ar & config;          // BOOST_WAVE_CONFIG
        if (config != BOOST_PP_STRINGIZE(BOOST_WAVE_CONFIG)) {
            BOOST_WAVE_THROW(preprocess_exception, incompatible_config, 
                "BOOST_WAVE_CONFIG", get_main_pos());
        }
        
        ar & pragma_keyword;  // BOOST_WAVE_PRAGMA_KEYWORD
        if (pragma_keyword != BOOST_WAVE_PRAGMA_KEYWORD) {
            BOOST_WAVE_THROW(preprocess_exception, incompatible_config, 
                "BOOST_WAVE_PRAGMA_KEYWORD", get_main_pos());
        }

        ar & string_type_str; // BOOST_PP_STRINGIZE((BOOST_WAVE_STRINGTYPE))
        if (string_type_str != BOOST_PP_STRINGIZE((BOOST_WAVE_STRINGTYPE))) {
            BOOST_WAVE_THROW(preprocess_exception, incompatible_config, 
                "BOOST_WAVE_STRINGTYPE", get_main_pos());
        }
        
        // read in the useful bits
        ar & language;
        ar & macros;
        ar & includes;
    }
    BOOST_SERIALIZATION_SPLIT_MEMBER()
#endif

private:
// the main input stream
    target_iterator_type first;         // underlying input stream
    target_iterator_type last;
    std::string filename;               // associated main filename
#if BOOST_WAVE_SUPPORT_PRAGMA_ONCE != 0
    std::string current_filename;       // real name of current preprocessed file
#endif 
    
    boost::wave::util::if_block_stack ifblocks;   // conditional compilation contexts
    boost::wave::util::include_paths includes;    // lists of include directories to search
    iteration_context_stack_type iter_ctxs;       // iteration contexts
    boost::wave::util::macromap<self_type> macros;  // map of defined macros
    boost::wave::language_support language;       // supported language/extensions
    hook_policy_type hooks;                       // hook policy instance
};

///////////////////////////////////////////////////////////////////////////////
}   // namespace wave
}   // namespace boost

#if BOOST_WAVE_SERIALIZATION != 0
namespace boost { namespace serialization {

template<
    typename Iterator, typename LexIterator, 
    typename InputPolicy, typename Hooks
>
struct tracking_level<boost::wave::context<Iterator, LexIterator, InputPolicy, Hooks> >
{
    typedef mpl::integral_c_tag tag;
    typedef mpl::int_<track_never> type;
    BOOST_STATIC_CONSTANT(
        int,
        value = tracking_level::type::value
    );
};

template<
    typename Iterator, typename LexIterator, 
    typename InputPolicy, typename Hooks
>
struct version<boost::wave::context<Iterator, LexIterator, InputPolicy, Hooks> >
{
    typedef boost::wave::context<Iterator, LexIterator, InputPolicy, Hooks>
        target_type;
    typedef mpl::int_<target_type::version> type;
    typedef mpl::integral_c_tag tag;
    BOOST_STATIC_CONSTANT(unsigned int, value = version::type::value);
};

}}  // namespace boost::serialization
#endif

// the suffix header occurs after all of the code
#ifdef BOOST_HAS_ABI_HEADERS
#include BOOST_ABI_SUFFIX
#endif

#endif // !defined(CPP_CONTEXT_HPP_907485E2_6649_4A87_911B_7F7225F3E5B8_INCLUDED)