tree_to_xml.ipp

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                  << impl::string_lit<CharT>::get("<") << tag << attr1 << attr2
                  << impl::string_lit<CharT>::get(">") << encode(textlit)
                  << impl::string_lit<CharT>::get("</") << tag
                  << impl::string_lit<CharT>::get(">\n");
        }
    };

    // a xml comment
    template <typename CharT>
    class comment : public element<CharT>
    {
    public:
        comment (std::basic_ostream<CharT> &ostrm_,
                 std::basic_string<CharT> const& commentlit)
        :   element<CharT>(ostrm_, false)
        {
            if ('\0' != commentlit[0])
            {
                this->output_space();
                this->ostrm << impl::string_lit<CharT>::get("<!-- ")
                      << encode(commentlit)
                      << impl::string_lit<CharT>::get(" -->\n");
            }
        }
    };

    // a xml document
    template <typename CharT>
    class document : public element<CharT>
    {
    public:
        document (std::basic_ostream<CharT> &ostrm_)
        :   element<CharT>(ostrm_)
        {
            this->get_indent() = -1;
            this->ostrm << impl::string_lit<CharT>::get(
                "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n");
        }

        document (std::basic_ostream<CharT> &ostrm_,
                  std::basic_string<CharT> const& mainnode,
                  std::basic_string<CharT> const& dtd)
        :   element<CharT>(ostrm_)
        {
            this->get_indent() = -1;
            this->ostrm << impl::string_lit<CharT>::get(
                "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n");

            this->output_space();
            this->ostrm << impl::string_lit<CharT>::get("<!DOCTYPE ") << mainnode
                  << impl::string_lit<CharT>::get(" SYSTEM \"") << dtd
                  << impl::string_lit<CharT>::get("\">\n");
        }
        ~document()
        {
            BOOST_SPIRIT_ASSERT(-1 == this->get_indent());
        }
    };

} // end of namespace xml

namespace impl {

    ///////////////////////////////////////////////////////////////////////////
    // look up the rule name from the given parser_id
    template <typename AssocContainerT>
    inline typename AssocContainerT::value_type::second_type
    get_rulename (AssocContainerT const &id_to_name_map,
        BOOST_SPIRIT_CLASSIC_NS::parser_id const &id)
    {
        typename AssocContainerT::const_iterator it = id_to_name_map.find(id);
        if (it != id_to_name_map.end())
            return (*it).second;
        typedef typename AssocContainerT::value_type::second_type second_t;
        return second_t();
    }

    // dump a parse tree as xml
    template <
        typename CharT, typename IteratorT, typename GetIdT, typename GetValueT
    >
    inline void
    token_to_xml (std::basic_ostream<CharT> &ostrm, IteratorT const &it,
        bool is_root, GetIdT const &get_token_id, GetValueT const &get_token_value)
    {
        BOOST_SPIRIT_OSSTREAM stream;

        stream << get_token_id(*it) << std::ends;
        xml::attribute<CharT> token_id (
                impl::string_lit<CharT>::get("id"),
                BOOST_SPIRIT_GETSTRING(stream).c_str());
        xml::attribute<CharT> is_root_attr (
                impl::string_lit<CharT>::get("is_root"),
                impl::string_lit<CharT>::get(is_root ? "1" : ""));
        xml::attribute<CharT> nil;
        xml::text<CharT>(ostrm,
                impl::string_lit<CharT>::get("token"),
                get_token_value(*it).c_str(),
                token_id,
                is_root_attr.has_value() ? is_root_attr : nil);
    }

    template <
        typename CharT, typename TreeNodeT, typename AssocContainerT,
        typename GetIdT, typename GetValueT
    >
    inline void
    tree_node_to_xml (std::basic_ostream<CharT> &ostrm, TreeNodeT const &node,
        AssocContainerT const& id_to_name_map, GetIdT const &get_token_id,
        GetValueT const &get_token_value)
    {
        typedef typename TreeNodeT::const_iterator node_iter_t;
        typedef
            typename TreeNodeT::value_type::parse_node_t::const_iterator_t
            value_iter_t;

        xml::attribute<CharT> nil;
        node_iter_t end = node.end();
        for (node_iter_t it = node.begin(); it != end; ++it)
        {
            // output a node
            xml::attribute<CharT> id (
                impl::string_lit<CharT>::get("rule"),
                get_rulename(id_to_name_map, (*it).value.id()).c_str());
            xml::node<CharT> currnode (ostrm,
                impl::string_lit<CharT>::get("parsenode"),
                (*it).value.id() != 0 && id.has_value() ? id : nil);

            // first dump the value
            std::size_t cnt = std::distance((*it).value.begin(), (*it).value.end());

            if (1 == cnt)
            {
                token_to_xml (ostrm, (*it).value.begin(),
                    (*it).value.is_root(), get_token_id, get_token_value);
            }
            else if (cnt > 1)
            {
                xml::node<CharT> value (ostrm,
                        impl::string_lit<CharT>::get("value"));
                bool is_root = (*it).value.is_root();

                value_iter_t val_end = (*it).value.end();
                for (value_iter_t val_it = (*it).value.begin();
                val_it != val_end; ++val_it)
                {
                    token_to_xml (ostrm, val_it, is_root, get_token_id,
                        get_token_value);
                }
            }
            tree_node_to_xml(ostrm, (*it).children, id_to_name_map,
                get_token_id, get_token_value);      // dump all subnodes
        }
    }

    template <typename CharT, typename TreeNodeT, typename AssocContainerT>
    inline void
    tree_node_to_xml (std::basic_ostream<CharT> &ostrm, TreeNodeT const &node,
            AssocContainerT const& id_to_name_map)
    {
        typedef typename TreeNodeT::const_iterator node_iter_t;

        xml::attribute<CharT> nil;
        node_iter_t end = node.end();
        for (node_iter_t it = node.begin(); it != end; ++it)
        {
            // output a node
            xml::attribute<CharT> id (
                impl::string_lit<CharT>::get("rule"),
                get_rulename(id_to_name_map, (*it).value.id()).c_str());
            xml::node<CharT> currnode (ostrm,
                impl::string_lit<CharT>::get("parsenode"),
                (*it).value.id() != parser_id() && id.has_value() ? id : nil);

            // first dump the value
            if ((*it).value.begin() != (*it).value.end())
            {
                std::basic_string<CharT> tokens ((*it).value.begin(), (*it).value.end());

                if (tokens.size() > 0)
                {
                    // output all subtokens as one string (for better readability)
                    xml::attribute<CharT> is_root (
                        impl::string_lit<CharT>::get("is_root"),
                        impl::string_lit<CharT>::get((*it).value.is_root() ? "1" : ""));
                    xml::text<CharT>(ostrm,
                        impl::string_lit<CharT>::get("value"), tokens.c_str(),
                        is_root.has_value() ? is_root : nil);
                }

            }
            // dump all subnodes
            tree_node_to_xml(ostrm, (*it).children, id_to_name_map);
        }
    }

} // namespace impl

///////////////////////////////////////////////////////////////////////////////
// dump a parse tree as a xml stream (generic variant)
template <
    typename CharT, typename TreeNodeT, typename AssocContainerT,
    typename GetIdT, typename GetValueT
>
inline void
basic_tree_to_xml (std::basic_ostream<CharT> &ostrm, TreeNodeT const &tree,
std::basic_string<CharT> const &input_line, AssocContainerT const& id_to_name,
        GetIdT const &get_token_id, GetValueT const &get_token_value)
{
    // generate xml dump
    xml::document<CharT> doc (ostrm,
            impl::string_lit<CharT>::get("parsetree"),
            impl::string_lit<CharT>::get("parsetree.dtd"));
    xml::comment<CharT> input (ostrm, input_line.c_str());
    xml::attribute<CharT> ver (
            impl::string_lit<CharT>::get("version"),
            impl::string_lit<CharT>::get("1.0"));
    xml::node<CharT> mainnode (ostrm,
            impl::string_lit<CharT>::get("parsetree"), ver);

    impl::tree_node_to_xml (ostrm, tree, id_to_name, get_token_id,
        get_token_value);
}

// dump a parse tree as a xml steam (for character based parsers)
template <typename CharT, typename TreeNodeT, typename AssocContainerT>
inline void
basic_tree_to_xml (std::basic_ostream<CharT> &ostrm, TreeNodeT const &tree,
        std::basic_string<CharT> const &input_line,
        AssocContainerT const& id_to_name)
{
    // generate xml dump
    xml::document<CharT> doc (ostrm,
            impl::string_lit<CharT>::get("parsetree"),
            impl::string_lit<CharT>::get("parsetree.dtd"));
    xml::comment<CharT> input (ostrm, input_line.c_str());
    xml::attribute<CharT> ver (
            impl::string_lit<CharT>::get("version"),
            impl::string_lit<CharT>::get("1.0"));
    xml::node<CharT> mainnode (ostrm,
            impl::string_lit<CharT>::get("parsetree"), ver);

    impl::tree_node_to_xml(ostrm, tree, id_to_name);
}

template <typename CharT, typename TreeNodeT>
inline void
basic_tree_to_xml (std::basic_ostream<CharT> &ostrm, TreeNodeT const &tree,
        std::basic_string<CharT> const &input_line)
{
    return basic_tree_to_xml<CharT>(ostrm, tree, input_line,
        std::map<BOOST_SPIRIT_CLASSIC_NS::parser_id, std::basic_string<CharT> >());
}

BOOST_SPIRIT_CLASSIC_NAMESPACE_END

}} // namespace boost::spirit

#undef BOOST_SPIRIT_OSSTREAM
#undef BOOST_SPIRIT_GETSTRING

#endif // !defined(PARSE_TREE_XML_HPP)