[Pydev-code] Fwd: Viewing ASTs in PyDev

[Neil <nei...@ut...>]

Hi Fabio, I'm following along with the mailing list advice stated here:
http://www.nabble.com/PyDev-Extension-Points-Quick-Fix-%28copied-from-pydev-forum%29-tf503666.html#a1365501

where you advise extending from pydev_builder to walk the AST.

However, I'm  new to Eclipse plugin programming so I wonder if you
could be a bit more specific.

Currently my plugin does something like:

public class PyGoal extends PyDevBuilderVisitor {
SourceModule sm = (SourceModule) getSourceModule(resource, document, nature);
SimpleNode sn = sm.getAst();
EasyASTIteratorVisitor vis = new EasyASTIteratorVisitor();
        try{
                sn.accept(vis);
        } catch(Exception e) {}
}
What I'd like to do is create a simplified syntax tree structure that
just stores functions, variables, control structures, and calls.  I'd
then do various specific things to that tree for my own plugin.

Can you illustrate how I would visit a particular document's AST,
putting the elements of interest in my own data structure? How do I
tell the PyDevBuilderVisitor what document/resource I'm working with?

thanks
neil ernst

On 4/25/07, Neil Ernst <ne...@cs...> wrote:
> I think it would look something like the JDT AST viewer plugin:
> http://www.eclipse.org/articles/Article-JavaCodeManipulation_AST/index.html
>
> I think I should probably create a separate plugin project that calls
> on PyDev to do the actual AST generation, then load that into my
> plugin.
>
> thanks for the advice
> neil
>
> On 4/25/07, Ueli Kistler <uki...@hs...> wrote:
> > Hi,
> >
> > i would not recommend using JGraph as I did... it would make more sense
> > to extend the current outline view or provide a new "outline"-like view
> > (i think there can be only one "true" outline view actually because its
> > bound to an editor implementation? Not sure about this..)
> >
> > This could of course be done in a separate project... it would require
> > similiar dependencies from PyDev as PEPTIC.
> >
> > Cheers,
> > Ueli
> >
> > --
> >
> >
> >
> >
> >
> > Fabio Zadrozny wrote:
> > > > My first challenge is to view the ASTs for the entire project (I'm
> > > > looking at the Trac source code). I notice in your code you have a
> > > > class for viewing the AST using JGraph.  Would you be able to point me
> > > > to a way to have this done in PyDev? I've been exploring the Jython
> > > > scripting elements of PyDev but I can't get your viewer to start that
> > > > way.
> > >
> > > The viewer that uses JGraph is not bundled in the pydev distribution
> > > and thus cannot be accessed with the scripting... If you have the
> > > source code, you can change those files from the 'contrib' source
> > > folder to the actual 'src' source folder so that they can be accessed
> > > (and add the related jars as dependencies for the plugin... or maybe a
> > > better idea would be creating another plugin to hold those things,
> > > which you can use and extend with your own code).
> > >
> > > Also, I think I would need more info on what you actually want to
> > > access to help you better...
> > >
> > > Cheers,
> > >
> > > Fabio
> >
> >
>


-- 
Neil A. Ernst
Ph.D. Candidate
University of Toronto
http://neilernst.net