graphml.cpp 11.4 KB
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// Copyright (C) 2006  Tiago de Paula Peixoto <tiago@forked.de>
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// Copyright (C) 2004  The Trustees of Indiana University.
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//
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// 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)
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//  Authors: Douglas Gregor
//           Andrew Lumsdaine
//           Tiago de Paula Peixoto

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#include <boost/variant.hpp>
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#include <expat.h>
#include <boost/graph/graphml.hpp>
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#include <boost/algorithm/string/replace.hpp>
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using namespace boost;
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class graphml_reader
{
public:
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    graphml_reader(mutate_graph& g)
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        : m_g(g), m_canonical_vertices(false) { }
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    void run(std::istream& in)
    {
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        const int buffer_size = 4096;
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        m_parser = XML_ParserCreateNS(0,'|');
        XML_SetElementHandler(m_parser, &on_start_element, &on_end_element);
        XML_SetCharacterDataHandler(m_parser, &on_character_data);
        XML_SetUserData(m_parser, this);
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        char buffer[buffer_size];
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        bool okay = true;
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        do
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        {
            in.read(buffer, buffer_size);
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            okay = XML_Parse(m_parser, buffer, in.gcount(), in.gcount() == 0);
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        }
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        while (okay && in.good());
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        if (!okay)
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        {
            std::stringstream s;
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            s << "on line " << XML_GetCurrentLineNumber(m_parser)
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              <<", column " << XML_GetCurrentColumnNumber(m_parser)
              << ": " << XML_ErrorString(XML_GetErrorCode(m_parser));
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            throw parse_error(s.str());
        }
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        XML_ParserFree(m_parser);
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    }

private:
    /// The kinds of keys. Not all of these are supported
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    enum key_kind {
        graph_key,
        node_key,
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        edge_key,
        hyperedge_key,
        port_key,
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        endpoint_key,
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        all_key
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    };

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    static void
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    on_start_element(void* user_data, const XML_Char *c_name,
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                     const XML_Char **atts)
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    {
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        graphml_reader* self = static_cast<graphml_reader*>(user_data);

        std::string name(c_name);
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        replace_first(name, "http://graphml.graphdrawing.org/xmlns|", "");
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        if (name == "edge")
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        {
            std::string id;
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            std::string source, target;
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            while (*atts)
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            {
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                std::string name = *atts++;
                std::string value = *atts++;

                if (name == "id") id = value;
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                else if (name == "source") source = value;
                else if (name == "target") target = value;
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                else if (name == "directed")
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                {
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                    bool edge_is_directed = (value == "directed");
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                    if (edge_is_directed != self->m_g.is_directed())
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                    {
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                        if (edge_is_directed)
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                            throw directed_graph_error();
                        else
                            throw undirected_graph_error();
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                    }
                }
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            }

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            self->m_active_descriptor = self->m_edge.size();
            self->handle_edge(source, target);
        }
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        else if (name == "node")
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        {
            std::string id;

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            while (*atts)
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            {
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                std::string name = *atts++;
                std::string value = *atts++;
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                if (name == "id") id = value;
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            }

            self->handle_vertex(id);
            self->m_active_descriptor = id;
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        }
        else if (name == "data")
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        {
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            while (*atts)
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            {
                std::string name = *atts++;
                std::string value = *atts++;

                if (name == "key") self->m_active_key = value;
            }
        }
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        else if (name == "key")
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        {
            std::string id;
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            std::string key_name;
            std::string key_type;
            key_kind kind = all_key;

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            while (*atts)
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            {
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                std::string name = *atts++;
                std::string value = *atts++;

                if (name == "id") id = value;
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                else if (name == "attr.name") key_name = value;
                else if (name == "attr.type") key_type = value;
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                else if (name == "for")
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                {
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                    if (value == "graph") kind = graph_key;
                    else if (value == "node") kind = node_key;
                    else if (value == "edge") kind = edge_key;
                    else if (value == "hyperedge") kind = hyperedge_key;
                    else if (value == "port") kind = port_key;
                    else if (value == "endpoint") kind = endpoint_key;
                    else if (value == "all") kind = all_key;
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                    else
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                    {
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                        std::stringstream s;
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                        s << "on line "
                          << XML_GetCurrentLineNumber(self->m_parser)
                          << ", column "
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                          << XML_GetCurrentColumnNumber(self->m_parser)
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                          << ": unrecognized key kind '" << value << "'";
                        throw parse_error(s.str());
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                    }
                }
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            }

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            self->m_keys[id] = kind;
            self->m_key_name[id] = key_name;
            self->m_key_type[id] = key_type;
            self->m_active_key = id;
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        }
        else if (name == "graph")
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        {
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            while (*atts)
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            {
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                std::string name = *atts++;
                std::string value = *atts++;
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                if (name == "edgedefault")
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                {
                    bool edge_is_directed = (value == "directed");
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                    if (edge_is_directed != self->m_g.is_directed())
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                    {
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                        if (edge_is_directed)
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                            throw directed_graph_error();
                        else
                            throw undirected_graph_error();
                    }
                }
                else if (name == "parse.nodeids")
                {
                    self->m_canonical_vertices = (value == "canonical");
                }
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            }
            self->m_active_descriptor = "";
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        }
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        self->m_character_data.clear();
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    }
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    static void
    on_end_element(void* user_data, const XML_Char *c_name)
    {
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        graphml_reader* self = static_cast<graphml_reader*>(user_data);
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        std::string name(c_name);
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        replace_first(name, "http://graphml.graphdrawing.org/xmlns|", "");
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        if (name == "data")
        {
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            self->handle_property(self->m_active_key, self->m_active_descriptor,
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                                  self->m_character_data);
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        }
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        else if (name == "default")
        {
            self->m_key_default[self->m_active_key] = self->m_character_data;
        }
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    }

    static void
    on_character_data(void* user_data, const XML_Char* s, int len)
    {
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        graphml_reader* self = static_cast<graphml_reader*>(user_data);
        self->m_character_data.append(s, len);
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    }

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    void
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    handle_vertex(const std::string& v)
    {
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        bool is_new = false;

        if (m_canonical_vertices)
        {
            size_t id;

            //strip leading "n" from name
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            try
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            {
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                id = lexical_cast<size_t>(std::string(v,1));
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            }
            catch (bad_lexical_cast)
            {
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                std::stringstream s;
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                s << "on line " << XML_GetCurrentLineNumber(m_parser)
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                  << ", column " << XML_GetCurrentColumnNumber(m_parser)
                  << ": invalid vertex: " << v;
                throw parse_error(s.str());
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            }
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            while(id >= m_canonical_vertex.size())
            {
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                m_canonical_vertex.push_back(m_g.do_add_vertex());
                is_new = true;
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            }
        }
        else
        {
            if (m_vertex.find(v) == m_vertex.end())
            {
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                m_vertex[v] = m_g.do_add_vertex();
                is_new = true;
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            }
        }

        if (is_new)
        {
            std::map<std::string, std::string>::iterator iter;
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            for (iter = m_key_default.begin(); iter != m_key_default.end();
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                 ++iter)
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            {
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                if (m_keys[iter->first] == node_key)
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                    handle_property(iter->first, v, iter->second);
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            }
        }
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    }

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    any
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    get_vertex_descriptor(const std::string& v)
    {
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        if (m_canonical_vertices)
        {
            //strip leading "n" from name
            size_t id = lexical_cast<size_t>(std::string(v,1));
            return m_canonical_vertex[id];
        }
        else
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        {
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            return m_vertex[v];
        }
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    }

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    void
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    handle_edge(const std::string& u, const std::string& v)
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    {
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        handle_vertex(u);
        handle_vertex(v);
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        any source, target;
        source = get_vertex_descriptor(u);
        target = get_vertex_descriptor(v);
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        any edge;
        bool added;
        tie(edge, added) = m_g.do_add_edge(source, target);
        if (!added)
            throw bad_parallel_edge(u, v);
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        size_t e = m_edge.size();
        m_edge.push_back(edge);
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        std::map<std::string, std::string>::iterator iter;
        for (iter = m_key_default.begin(); iter != m_key_default.end(); ++iter)
        {
            if (m_keys[iter->first] == edge_key)
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                handle_property(iter->first, e, iter->second);
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        }
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    }
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    void handle_property(const std::string& key_id,
                         const variant<std::string,size_t>& descriptor,
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                         const std::string& value)
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    {
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        try
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        {
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            if (get<std::string>(&descriptor))
            {
                if (get<std::string>(descriptor) == "")
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                    m_g.set_graph_property(m_key_name[key_id], value,
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                                           m_key_type[key_id]);
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                else
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                    m_g.set_vertex_property(m_key_name[key_id],
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                                            get_vertex_descriptor
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                                                (get<std::string>(descriptor)),
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                                            value, m_key_type[key_id]);
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            }
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            else
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            {
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                m_g.set_edge_property(m_key_name[key_id],
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                                      get_edge_descriptor
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                                          (get<size_t>(descriptor)),
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                                      value, m_key_type[key_id]);
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            }
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        }
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        catch (parse_error &e)
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        {
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            std::stringstream s;
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            s << "on line " << XML_GetCurrentLineNumber(m_parser)
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              << ", column " << XML_GetCurrentColumnNumber(m_parser)
              << ": " << e.error;
            throw parse_error(s.str());
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        }
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    }

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    any
    get_edge_descriptor(size_t e)
    {
        return m_edge[e];
    }

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    mutate_graph& m_g;
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    std::map<std::string, key_kind> m_keys;
    std::map<std::string, std::string> m_key_name;
    std::map<std::string, std::string> m_key_type;
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    std::map<std::string, std::string> m_key_default;
    std::map<std::string, any> m_vertex;
    std::vector<any> m_canonical_vertex;
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    std::vector<any> m_edge;
    variant<std::string, size_t> m_active_descriptor;
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    std::string m_active_key;
    std::string m_character_data;
    bool m_canonical_vertices;
    bool m_canonical_edges;
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    XML_Parser m_parser;
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};

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namespace boost
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{
void
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read_graphml(std::istream& in, mutate_graph& g)
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{
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    graphml_reader reader(g);
    reader.run(in);
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}
}