/*=============================================================================
    Copyright (c) 2001-2003 Hartmut Kaiser
    Copyright (c) 2001-2003 Daniel Nuffer
    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)
=============================================================================*/

#if !defined(TREE_TO_XML_IPP)
#define TREE_TO_XML_IPP

#include <cstdio>
#include <cstdarg>

#include <map>
#include <iostream>
#include <boost/config.hpp>
#ifdef BOOST_NO_STRINGSTREAM
#include <strstream>
#define BOOST_SPIRIT_OSSTREAM std::ostrstream
inline std::string BOOST_SPIRIT_GETSTRING(std::ostrstream& ss)
{
    ss << ends;
    std::string rval = ss.str();
    ss.freeze(false);
    return rval;
}
#else
#include <sstream>
#define BOOST_SPIRIT_GETSTRING(ss) ss.str()
#define BOOST_SPIRIT_OSSTREAM std::ostringstream
#endif

namespace boost { namespace spirit {

// xml formatting helper classes
namespace xml {

    inline void
    encode (std::string &str, char s, char const *r, int len)
    {
        std::string::size_type pos = 0;
        while ((pos = str.find_first_of (s, pos)) !=
        std::string::size_type(std::string::npos))
        {
            str.replace (pos, 1, r);
            pos += len;
        }
    }

    inline std::string
    encode (std::string str)
    {
        encode(str, '&', "&amp;", 3);
        encode(str, '<', "&lt;", 2);
        encode(str, '>', "&gt;", 2);
        encode(str, '\r', "\\r", 1);
        encode(str, '\n', "\\n", 1);
        return str;
    }

    inline std::string
    encode (char const *text)
    {
        return encode (std::string(text));
    }

    // format a xml attribute
    struct attribute
    {
        attribute()
        {
        }

        attribute (char const *key_, char const *value_) :
        key (key_), value(value_)
        {
        }

        bool has_value()
        {
            return value.size() > 0;
        }

        std::string key;
        std::string value;
    };

    inline std::ostream&
    operator<< (std::ostream &ostrm, attribute const &attr)
    {
        if (0 == attr.key.size())
            return ostrm;
        ostrm << " " << encode(attr.key) << "=\"" << encode(attr.value) << "\"";
        return ostrm;
    }

    // output a xml element (base class, not used directly)
    class element
    {
    protected:
        element(std::ostream &ostrm_, bool incr_indent_ = true) :
        ostrm(ostrm_), incr_indent(incr_indent_)
        {
            if (incr_indent) ++get_indent();
        }
        ~element()
        {
            if (incr_indent) --get_indent();
        }

    public:
        void output_space ()
        {
            for (int i = 0; i < get_indent(); i++)
                ostrm << "    ";
        }

    protected:
        int &get_indent()
        {
            static int indent;

            return indent;
        }

        std::ostream &ostrm;
        bool incr_indent;
    };

    // a xml node
    class node : public element
    {
    public:
        node (std::ostream &ostrm_, char const *tag_, attribute &attr) :
        element(ostrm_), tag(tag_)
        {
            output_space();
            ostrm << "<" << tag_ << attr << ">\n";
        }
        node (std::ostream &ostrm_, char const *tag_) :
        element(ostrm_), tag(tag_)
        {
            output_space();
            ostrm << "<" << tag_ << ">\n";
        }
        ~node()
        {
            output_space();
            ostrm << "</" << tag << ">\n";
        }

    private:
        std::string tag;
    };

    class text : public element
    {
    public:
        text (std::ostream &ostrm, char const *tag, char const *text) :
        element(ostrm)
        {
            output_space();
            ostrm << "<" << tag << ">" << encode(text)
            << "</" << tag << ">\n";
        }

        text (std::ostream &ostrm, char const *tag, char const *text,
                attribute &attr) :
            element(ostrm)
        {
            output_space();
            ostrm << "<" << tag << attr << ">" << encode(text)
            << "</" << tag << ">\n";
        }

        text (std::ostream &ostrm, char const *tag, char const *text,
                attribute &attr1, attribute &attr2) :
            element(ostrm)
        {
            output_space();
            ostrm << "<" << tag << attr1 << attr2 << ">" << encode(text)
            << "</" << tag << ">\n";
        }
    };

    // a xml comment
    class comment : public element
    {
    public:
        comment (std::ostream &ostrm, char const *comment) :
            element(ostrm, false)
        {
            if ('\0' != comment[0])
            {
                output_space();
                ostrm << "<!-- " << encode(comment) << " -->\n";
            }
        }
    };

    // a xml document
    class document : public element
    {
    public:
        document (std::ostream &ostrm) : element(ostrm)
        {
            get_indent() = -1;
            ostrm << "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n";
        }

        document (std::ostream &ostrm, char const *mainnode, char const *dtd) :
            element(ostrm)
        {
            get_indent() = -1;
            ostrm << "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n";

            output_space();
            ostrm << "<!DOCTYPE " << mainnode << " SYSTEM \"" << dtd
            << "\">\n";
        }
        ~document()
        {
            BOOST_SPIRIT_ASSERT(-1 == 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::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 IteratorT, typename GetIdT, typename GetValueT>
    inline void
    token_to_xml (std::ostream &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 token_id ("id", BOOST_SPIRIT_GETSTRING(stream).c_str());
        xml::attribute is_root_attr ("is_root", is_root ? "1" : "");
        xml::attribute nil;
        xml::text(ostrm, "token", get_token_value(*it).c_str(),
            token_id, is_root_attr.has_value() ? is_root_attr : nil);
    }

    template <
        typename TreeNodeT, typename AssocContainerT,
        typename GetIdT, typename GetValueT
    >
    inline void
    tree_node_to_xml (std::ostream &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 nil;
        node_iter_t end = node.end();
        for (node_iter_t it = node.begin(); it != end; ++it)
        {
            // output a node
            xml::attribute id ("rule",
                get_rulename(id_to_name_map, (*it).value.id()).c_str());
            xml::node currnode (ostrm, "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 value (ostrm, "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 TreeNodeT, typename AssocContainerT>
    inline void
    tree_node_to_xml (std::ostream &ostrm, TreeNodeT const &node,
            AssocContainerT const& id_to_name_map)
    {
        typedef typename TreeNodeT::const_iterator node_iter_t;

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

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

                if (tokens.size() > 0)
                {
                    // output all subtokens as one string (for better readability)
                    xml::attribute is_root ("is_root",
                        (*it).value.is_root() ? "1" : "");
                    xml::text(ostrm, "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 TreeNodeT, typename AssocContainerT,
    typename GetIdT, typename GetValueT
>
inline void
tree_to_xml (std::ostream &ostrm, TreeNodeT const &tree,
std::string const &input_line, AssocContainerT const& id_to_name,
        GetIdT const &get_token_id, GetValueT const &get_token_value)
{
    // generate xml dump
    xml::document doc (ostrm, "parsetree", "parsetree.dtd");
    xml::comment input (ostrm, input_line.c_str());
    xml::attribute ver ("version", "1.0");
    xml::node mainnode (ostrm, "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 TreeNodeT, typename AssocContainerT>
inline void
tree_to_xml (std::ostream &ostrm, TreeNodeT const &tree,
        std::string const &input_line, AssocContainerT const& id_to_name)
{
    // generate xml dump
    xml::document doc (ostrm, "parsetree", "parsetree.dtd");
    xml::comment input (ostrm, input_line.c_str());
    xml::attribute ver ("version", "1.0");
    xml::node mainnode (ostrm, "parsetree", ver);

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

template <typename TreeNodeT>
inline void
tree_to_xml (std::ostream &ostrm, TreeNodeT const &tree,
        std::string const &input_line)
{
    return tree_to_xml(ostrm, tree, input_line,
        std::map<boost::spirit::parser_id, std::string>());
}

}} // namespace boost::spirit

#undef BOOST_SPIRIT_OSSTREAM
#undef BOOST_SPIRIT_GETSTRING

#endif // !defined(PARSE_TREE_XML_HPP)
