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NAME

       GraphViz::Parse::Yapp - Visualise grammars

SYNOPSIS

         use GraphViz::Parse::Yapp;

         # Pass in a file generated via yapp -v
         my $g = GraphViz::Parse::Yapp->new('Yapp.output');
         print $g->as_png;

DESCRIPTION

       This module makes it easy to visualise Parse::Yapp grammars.  Writing
       Parse::Yapp grammars is tricky at the best of times, and grammars
       almost always evolve in ways unforseen at the start. This module aims
       to visualise a grammar as a graph in order to make the structure clear
       and aid in understanding the grammar.

       Rules are represented as nodes, which have their name on the left of
       the node and their productions on the right of the node. The subrules
       present in the productions are represented by edges to the subrule
       nodes.

       Thus, every node (rule) should be connected to the graph - otherwise a
       rule is not part of the grammar.

       This uses the GraphViz module to draw the graph. Thanks to Damian
       Conway for the original idea.

METHODS

   new
       This is the constructor. It takes one mandatory argument, which is a
       filename of the output file generated by running "yapp -v " on the
       grammar file. For example, if your Parse::Yapp grammar file is called
       "calc.yp", you would run "yapp -v calc.yp" and pass in "calc.output" as
       an argument here. A GraphViz object is returned.

         # Pass in a file generated via yapp -v
         my $graph = GraphViz::Parse::Yapp->new('Yapp.output');
         print $g->as_png;

   as_*
       The grammar can be visualised in a number of different graphical
       formats. Methods include as_ps, as_hpgl, as_pcl, as_mif, as_pic, as_gd,
       as_gd2, as_gif, as_jpeg, as_png, as_wbmp, as_ismap, as_imap, as_vrml,
       as_vtx, as_mp, as_fig, as_svg. See the GraphViz documentation for more
       information. The two most common methods are:

         # Print out a PNG-format file
         print $g->as_png;

         # Print out a PostScript-format file
         print $g->as_ps;

AUTHOR

       Leon Brocard <acme@astray.com>

COPYRIGHT

       Copyright (C) 2001, Leon Brocard

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



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