NAME

       Graph::Reader::Dot - class for reading a Graph instance from Dot format

SYNOPSIS

           use Graph::Reader::Dot;
           use Graph;

           $reader = Graph::Reader::Dot->new();
           $graph = $reader->read_graph('mygraph.dot');

DESCRIPTION

       Graph::Reader::Dot is a class for reading in a directed graph in the file format used by
       the dot tool (part of the AT+T graphviz package).

       Graph::Reader::Dot is a subclass of Graph::Reader, which defines the generic interface for
       Graph reader classes.

METHODS AND CONFIGURATION

   "new()"
       Constructor - generate a new reader instance.

           $reader = Graph::Reader::Dot->new();

       This doesn't take any arguments.

   "read_graph()"
       Read a graph from a file:

           $graph = $reader->read_graph( $file );

       The $file argument can be either a filename or a filehandle of a previously opened file.

   $Graph::Reader::Dot::UseNodeAttr
       Controls, if implicit node attributes given by the dot directive "node[]" will be merged
       into (new) nodes.  Setting it to 0 or "undef" (default) will not disable this feature.
       Setting it to any other value will enable this feature.

   $Graph::Reader::Dot::UseEdgeAttr
       Controls, if implicit edge attributes given by the dot directive "edge[]" will be merged
       into edges.  Setting it to 0 or "undef" (default) will not disable this feature.  Setting
       it to any other value will enable this feature.

RESTRICTIONS

       •   Default (graph) attributes in subgraphs (i.e. inside "{}") are not processed.

       •   Sub nodes as used by dot's "record" node shape are supported.

       •   Undirected graphs will be treated as directed graphs.  This means that the "--" edge
           operator works as the "->" edge operator.

       •   Be aware that you are loosing scope information on writing back the graph.

       •   Multiple "node[]" or "edge[]" statements in the same scope are not correctly
           supported.

SEE ALSO

       http://www.graphviz.org/
           The home page for the AT+T graphviz toolkit that includes the dot tool.

       Graph::Reader
           The base class for Graph::Reader::Dot.

       Graph::Writer::Dot
           Used to serialise a Graph instance in Dot format.

       Graph
           Jarkko Hietaniemi's classes for representing directed graphs.

       Parse::Yapp
           Another base class for Graph::Reader::Dot.  The Parse::Yapp module comes with the
           following copyright notice:

           The Parse::Yapp module and its related modules and shell scripts are copyright (c)
           1998-1999 Francois Desarmenien, France. All rights reserved.

           You may use and distribute them under the terms of either the GNU General Public
           License or the Artistic License, as specified in the Perl README file.

           If you use the "standalone parser" option so people don't need to install Parse::Yapp
           on their systems in order to run you software, this copyright noticed should be
           included in your software copyright too, and the copyright notice in the embedded
           driver should be left untouched.

AUTHOR

       Mark A. Hillebrand <mah@wjpserver.cs.uni-sb.de>

COPYRIGHT

       Copyright (c) 2001 by Mark A. Hillebrand.  All rights reserved.

       This module is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.