cpp_macromap.hpp

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            else if (adjacent_stringize && 
                    !IS_CATEGORY(*cit, WhiteSpaceTokenType)) 
            {
            // stringize the current argument
                BOOST_ASSERT(!arguments[i].empty());
                
            // safe a copy of the first tokens position (not a reference!)
            position_type pos ((*arguments[i].begin()).get_position());

#if BOOST_WAVE_SUPPORT_VARIADICS_PLACEMARKERS != 0
                if (is_ellipsis && boost::wave::need_variadics(ctx.get_language())) {
                    impl::trim_sequence_left(arguments[i]);
                    impl::trim_sequence_right(arguments.back());
                    expanded.push_back(token_type(T_STRINGLIT, 
                        impl::as_stringlit(arguments, i, pos), pos));
                }
                else 
#endif 
                {
                    impl::trim_sequence(arguments[i]);
                    expanded.push_back(token_type(T_STRINGLIT, 
                        impl::as_stringlit(arguments[i], pos), pos));
                }
                adjacent_stringize = false;
            }
            else {
            // simply copy the original argument (adjacent '##' or '#')
#if BOOST_WAVE_SUPPORT_VARIADICS_PLACEMARKERS != 0
                if (is_ellipsis) {
                position_type const &pos = (*cit).get_position();

                    impl::trim_sequence_left(arguments[i]);
                    impl::trim_sequence_right(arguments.back());
                    BOOST_ASSERT(boost::wave::need_variadics(ctx.get_language()));
                    impl::replace_ellipsis(arguments, i, expanded, pos);
                }
                else
#endif
                {
                ContainerT &arg = arguments[i];
                
                    impl::trim_sequence(arg);
                    std::copy(arg.begin(), arg.end(), 
                        std::inserter(expanded, expanded.end()));
                }
            }
        }
        else if (!adjacent_stringize || T_POUND != base_id) {
        // insert the actual replacement token (if it is not the '#' operator)
            expanded.push_back(*cit);
        }
    }

    if (adjacent_stringize) {
    // error, '#' should not be the last token
        BOOST_WAVE_THROW_CTX(ctx, preprocess_exception, ill_formed_operator,
            "stringize ('#')", main_pos);
        return;
    }
        
// handle the cpp.concat operator
    if (seen_concat)
        concat_tokensequence(expanded);
}

///////////////////////////////////////////////////////////////////////////////
//
//  rescan_replacement_list
//
//    As the name implies, this function is used to rescan the replacement list 
//    after the first macro substitution phase.
//
///////////////////////////////////////////////////////////////////////////////
template <typename ContextT>
template <typename IteratorT, typename ContainerT>
inline void 
macromap<ContextT>::rescan_replacement_list(token_type const &curr_token, 
    macro_definition_type &macro_def, ContainerT &replacement_list, 
    ContainerT &expanded, bool expand_operator_defined,
    IteratorT &nfirst, IteratorT const &nlast)
{
    if (!replacement_list.empty()) {
#if BOOST_WAVE_SUPPORT_VARIADICS_PLACEMARKERS != 0
    // remove the placemarkers
        if (boost::wave::need_variadics(ctx.get_language())) {
        typename ContainerT::iterator end = replacement_list.end();
        typename ContainerT::iterator it = replacement_list.begin();
        
            while (it != end) {
                using namespace boost::wave;
                if (T_PLACEMARKER == token_id(*it)) {
                typename ContainerT::iterator placemarker = it;
                
                    ++it;
                    replacement_list.erase(placemarker);
                }
                else {
                    ++it;
                }
            }
        }
#endif

    // rescan the replacement list, during this rescan the current macro under
    // expansion isn't available as an expandable macro
    on_exit::reset<bool> on_exit(macro_def.is_available_for_replacement, false);
    typename ContainerT::iterator begin_it = replacement_list.begin();
    typename ContainerT::iterator end_it = replacement_list.end();
    
        expand_whole_tokensequence(expanded, begin_it, end_it, 
            expand_operator_defined);     
        
    // trim replacement list, leave placeholder tokens untouched
        impl::trim_replacement_list(expanded);
    }
    
    if (expanded.empty()) {
    // the resulting replacement list should contain at least a placeholder
    // token
        expanded.push_back(token_type(T_PLACEHOLDER, "_", curr_token.get_position()));
    }
}

///////////////////////////////////////////////////////////////////////////////
// 
//  expand_macro(): expands a defined macro
//
//      This functions tries to expand the macro, to which points the 'first'
//      iterator. The functions eats up more tokens, if the macro to expand is
//      a function-like macro.
//
///////////////////////////////////////////////////////////////////////////////
template <typename ContextT>
template <typename IteratorT, typename ContainerT>
inline bool 
macromap<ContextT>::expand_macro(ContainerT &expanded, 
    token_type const &curr_token, typename defined_macros_type::iterator it, 
    IteratorT &first, IteratorT const &last, 
    bool& seen_newline, bool expand_operator_defined, 
    defined_macros_type *scope, ContainerT *queue_symbol) 
{
    using namespace boost::wave;
    
    if (0 == scope) scope = current_macros;
    
    BOOST_ASSERT(T_IDENTIFIER == token_id(curr_token) ||
        IS_CATEGORY(token_id(curr_token), KeywordTokenType) ||
        IS_EXTCATEGORY(token_id(curr_token), OperatorTokenType|AltExtTokenType) ||
        IS_CATEGORY(token_id(curr_token), BoolLiteralTokenType));
        
    if (it == scope->end()) {
        ++first;    // advance

    // try to expand a predefined macro (__FILE__, __LINE__ or __INCLUDE_LEVEL__)
        if (expand_predefined_macro(curr_token, expanded))
            return false;
        
    // not defined as a macro
        if (0 != queue_symbol) {
            expanded.splice(expanded.end(), *queue_symbol);
        }
        else {
            expanded.push_back(curr_token);
        }
        return false;
    }

// ensure the parameters to be replaced with special parameter tokens
macro_definition_type &macro_def = *(*it).second.get();

    macro_def.replace_parameters();

// test if this macro is currently available for replacement
    if (!macro_def.is_available_for_replacement) {
    // this macro is marked as non-replaceable
    // copy the macro name itself
        if (0 != queue_symbol) {
            queue_symbol->push_back(token_type(T_NONREPLACABLE_IDENTIFIER,
                curr_token.get_value(), curr_token.get_position()));
            expanded.splice(expanded.end(), *queue_symbol);
        }
        else {
            expanded.push_back(token_type(T_NONREPLACABLE_IDENTIFIER,
                curr_token.get_value(), curr_token.get_position()));
        }
        ++first;
        return false;
    }

// try to replace the current identifier as a function-like macro
ContainerT replacement_list;

    if (T_LEFTPAREN == impl::next_token<IteratorT>::peek(first, last)) {
    // called as a function-like macro 
        impl::skip_to_token(first, last, T_LEFTPAREN, seen_newline);
        
#if BOOST_WAVE_USE_DEPRECIATED_PREPROCESSING_HOOKS == 0
        IteratorT seqstart = first;
        IteratorT seqend = first;
#endif

        if (macro_def.is_functionlike) {
        // defined as a function-like macro
        
        // collect the arguments
        std::vector<ContainerT> arguments;
#if BOOST_WAVE_USE_DEPRECIATED_PREPROCESSING_HOOKS != 0
        typename std::vector<ContainerT>::size_type count_args = 
            collect_arguments (curr_token, arguments, first, last, 
                macro_def.macroparameters.size(), seen_newline);
#else
        typename std::vector<ContainerT>::size_type count_args = 
            collect_arguments (curr_token, arguments, first, seqend, last, 
                macro_def.macroparameters.size(), seen_newline);
#endif

        // verify the parameter count
            if (count_args < macro_def.macroparameters.size() ||
                arguments.size() < macro_def.macroparameters.size()) 
            {
                if (count_args != arguments.size()) {
                // must been at least one empty argument in C++ mode
                    BOOST_WAVE_THROW_CTX(ctx, preprocess_exception, 
                        empty_macroarguments, curr_token.get_value().c_str(), 
                        main_pos);
                }
                else {
                // too few macro arguments
                    BOOST_WAVE_THROW_CTX(ctx, preprocess_exception, 
                        too_few_macroarguments, curr_token.get_value().c_str(), 
                        main_pos);
                }
                return false;
            }
            
            if (count_args > macro_def.macroparameters.size() ||
                arguments.size() > macro_def.macroparameters.size()) 
            {
#if BOOST_WAVE_SUPPORT_VARIADICS_PLACEMARKERS != 0
                if (!macro_def.has_ellipsis) 
#endif 
                {
                // too many macro arguments
                    BOOST_WAVE_THROW_CTX(ctx, preprocess_exception, 
                        too_many_macroarguments, 
                        curr_token.get_value().c_str(), main_pos);
                    return false;
                }
            }
                
        // inject tracing support
#if BOOST_WAVE_USE_DEPRECIATED_PREPROCESSING_HOOKS != 0
            ctx.get_hooks().expanding_function_like_macro(
                macro_def.macroname, macro_def.macroparameters, 
                macro_def.macrodefinition, curr_token, arguments);
#else
            if (ctx.get_hooks().expanding_function_like_macro(ctx.derived(), 
                    macro_def.macroname, macro_def.macroparameters, 
                    macro_def.macrodefinition, curr_token, arguments,
                    seqstart, seqend))
            {
                // do not expand this macro, just copy the whole sequence 
                std::copy(seqstart, first, 
                    std::inserter(replacement_list, replacement_list.end()));
                return false;           // no further preprocessing required
            }
#endif

        // expand the replacement list of this macro
            expand_replacement_list(macro_def, arguments, expand_operator_defined,
                replacement_list);
        }
        else {
        // defined as an object-like macro
#if BOOST_WAVE_USE_DEPRECIATED_PREPROCESSING_HOOKS != 0
            ctx.get_hooks().expanding_object_like_macro(
                macro_def.macroname, macro_def.macrodefinition, curr_token);
#else
            if (ctx.get_hooks().expanding_object_like_macro(ctx.derived(), 
                  macro_def.macroname, macro_def.macrodefinition, curr_token))
            {
                // do not expand this macro, just copy the whole sequence 
                replacement_list.push_back(curr_token);
                ++first;                // skip macro name
                return false;           // no further preprocessing required
            }
#endif

        bool found = false;
        impl::find_concat_operator concat_tag(found);
        
            std::remove_copy_if(macro_def.macrodefinition.begin(), 
                macro_def.macrodefinition.end(), 
                std::inserter(replacement_list, replacement_list.end()),
                concat_tag);
                
        // handle concatenation operators
            if (found && !concat_tokensequence(replacement_list))
                return false;
        }
    }
    else {
    // called as an object like macro
        if ((*it).second->is_functionlike) {
        // defined as a function-like macro
            if (0 != queue_symbol) {
                queue_symbol->push_back(curr_token);
                expanded.splice(expanded.end(), *queue_symbol);
            }
            else {
                expanded.push_back(curr_token);
            }
            ++first;                // skip macro name
            return false;           // no further preprocessing required
        }
        else {
        // defined as an object-like macro (expand it)
#if BOOST_WAVE_USE_DEPRECIATED_PREPROCESSING_HOOKS != 0
            ctx.get_hooks().expanding_object_like_macro(
                macro_def.macroname, macro_def.macrodefinition, curr_token);
#else
            if (ctx.get_hooks().expanding_object_like_macro(ctx.derived(), 
                  macro_def.macroname, macro_def.macrodefinition, curr_token))
            {
                // do not expand this macro, just copy the whole sequence 
                replacement_list.push_back(curr_token);
                ++first;                // skip macro name
                return false;           // no further preprocessing required
            }
#endif

        bool found = false;
        impl::find_concat_operator concat_tag(found);
        
            std::remove_copy_if(macro_def.macrodefinition.begin(), 
                macro_def.macrodefinition.end(), 
                std::inserter(replacement_list, replacement_list.end()),
                concat_tag);