RhodeCode

  /// \relates DigraphWriter

  template <typename Digraph>

  DigraphWriter<Digraph> digraphWriter(const char* fn,

                                       const Digraph& digraph) {

    DigraphWriter<Digraph> tmp(fn, digraph);

    return tmp;

  }

  template <typename Graph>

  class GraphWriter;

  template <typename Graph>

  GraphWriter<Graph> graphWriter(std::ostream& os, const Graph& graph);

  template <typename Graph>

  GraphWriter<Graph> graphWriter(const std::string& fn, const Graph& graph);

  template <typename Graph>

  GraphWriter<Graph> graphWriter(const char *fn, const Graph& graph);

  /// \ingroup lemon_io

  ///

  /// \brief \ref lgf-format "LGF" writer for directed graphs

  ///

  /// This utility writes an \ref lgf-format "LGF" file.

  ///

  /// It can be used almost the same way as \c DigraphWriter.

  /// The only difference is that this class can handle edges and

  /// edge maps as well as arcs and arc maps.

  ///

  /// The arc maps are written into the file as two columns, the

  /// caption of the columns are the name of the map prefixed with \c

  /// '+' and \c '-'. The arcs are written into the \c \@attributes

  /// section as a \c '+' or a \c '-' prefix (depends on the direction

  /// of the arc) and the label of corresponding edge.

  template <typename _Graph>

  class GraphWriter {

  public:

    typedef _Graph Graph;

    TEMPLATE_GRAPH_TYPEDEFS(Graph);

  private:

    std::ostream* _os;

    bool local_os;

    std::string _nodes_caption;

    std::string _edges_caption;

    std::string _attributes_caption;

    typedef std::map<Node, std::string> NodeIndex;

    NodeIndex _node_index;

    typedef std::map<Edge, std::string> EdgeIndex;

    EdgeIndex _edge_index;

    typedef std::vector<std::pair<std::string,

      _writer_bits::MapStorageBase<Node>* > > NodeMaps;

    NodeMaps _node_maps;

    typedef std::vector<std::pair<std::string,

      _writer_bits::MapStorageBase<Edge>* > >EdgeMaps;

    EdgeMaps _edge_maps;

    typedef std::vector<std::pair<std::string,

      _writer_bits::ValueStorageBase*> > Attributes;

    Attributes _attributes;

    bool _skip_nodes;

    bool _skip_edges;

  public:

    /// \brief Constructor

    ///

    /// Construct a directed graph writer, which writes to the given

    /// output stream.

    GraphWriter(std::ostream& is, const Graph& graph)

      : _os(&is), local_os(false), _graph(graph),

        _skip_nodes(false), _skip_edges(false) {}

    /// \brief Constructor

    ///

    /// Construct a directed graph writer, which writes to the given

    /// output file.

    GraphWriter(const std::string& fn, const Graph& graph)

      : _os(new std::ofstream(fn.c_str())), local_os(true), _graph(graph),

        _skip_nodes(false), _skip_edges(false) {}

    /// \brief Constructor

    ///

    /// Construct a directed graph writer, which writes to the given

    /// output file.

    GraphWriter(const char* fn, const Graph& graph)