Graph::Reader::Dot(3pm)

Usage

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

Overview

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.

Releases

8 releases since Debian 6.0 (Squeeze); the text changed 5 times.