Re: Graphical output for bison's debug information

[Luca]

Il 11/01/2010 13.32, Matthias Bartelt ha scritto:
> hi,
> i was looking around for a tool to obtain a graphical
> tree out of bison's debug output. does such a tool
> already exist?
>
> kind regards
>
>
> _______________________________________________
> address@hidden http://lists.gnu.org/mailman/listinfo/help-bison
bison output is something similar to

Stack now 0 2 18
Entering state 37
Next token is token "IDENTIFIER" (5.3-5.15: )
Shifting token "IDENTIFIER" (5.3-5.15: )

and you can trace your parser setting
yydebug=1;
I think it is difficult to find a graphical tool for this output.

You can generate an output graphical representation of the LALR(1) 
grammar automaton using the -g option and then you can display this file 
using graphviz (http://www.graphviz.org/) ; but I think it isn't very 
useful to debug a grammar.

If you want to debug your grammar in a smart way, just  build a syntax 
tree (in the actions) and then walk it. You can print out an XML node 
for each syntax node; after building a XML file you can use a browser or 
a grafical tool (for example yed, 
http://www.yworks.com/en/products_yed_about.html) to display it.

Luca