DOT Tree Generation throws exception

[xxx]

Hi,

I'm trying to generate a graph of the AST, but I get an exception. The grammar I'm using is just one of the sample grammars: https://github.com/ohboyohboyohboy/antlr3/blob/master/samples/SearchExpression.g.

The script to generate the tree and exception I'm getting are at https://gist.github.com/772368

Am I just doing it wrong?

[ohboyohboyohboy]

Hey there,

I'm sorry, but the DOT Generator library is a library that I ported from the Python binding early on in this project without writing extensive test code for it. I suppose I kind of forgot about it while I was expanding the project over time, as I just reviewed that utility and found out that it was horrifically broken.

Fortunately, it's a pretty simple class, so I was able to patch it up and get it working again, at least for the purposes of the simple script you cited. I just pushed this new version (1.8.8), and I tested it against the code you gave. It should work for you now. Thanks for reporting that. Let me know if you have any questions.

[xxx]

Thanks for the quick fix!

I can confirm the previous error is gone, but the DOT files are being generated with a syntax error - There is no name on the digraph being generated, so it's not parsing. i.e.:

digraph {

should be

digraph G {

or something.

After doing that, the graphs work fine for me.

Thanks again.

[xxx]

Hmm, only the dotty tool complains about the lack of an ID on a graph. Everything works fine when converting to an image file, and I do see now the ID is optional per the DOT grammar. ¯(°_o)/¯