[antlr-interest] How to get GUI like tree structure

[Ketan Maheshwari]

Hi Jim, Hi All

I searched but still am struggling to really get the parsertree object for
my grammar.

My goal is to get the parser tree object just as being shown in the GUI and
put its elements in another object that I need to construct based upon the
tree.

But after a lot of search I still have no clue how do I get the ParserTree
object with a *hierarchy of rules* and leaf nodes as the actual *tokens* of
my program!


Many thanks for any help with this.

Regards
Ketan

On Mon, Mar 29, 2010 at 6:30 PM, Jim Idle <jimi at temporal-wave.com> wrote:

> Ah. You are asking for the parser tree, not a representation of the AST?
> Search the mailing list for this. Such a tree is not generally useful for
> doing things with (so if you are looking for this information because you
> want to use it to generate code or something, then you are probably looking
> at your problem incorrectly), but it is very useful for debugging the tree.
>
>
>
> http://antlr.markmail.org/search/?q=parse+tree
>
>
>
>
>
> If all you want is information in the nodes, then get the payload of the
> leaf node (usually CommonToken) and ask for it, but that’s what the code you
> looked at is doing.
>
>
>
> Jim
>
>
>
>
>
> From: Ketan Maheshwari [mailto:ketancmaheshwari at gmail.com]
> Sent: Monday, March 29, 2010 9:18 AM
> To: Jim Idle
> Cc: antlr-interest at antlr.org
> Subject: Re: [antlr-interest] How to get GUI like tree structure
>
>
>
> Jim
>
>
>
> Thanks again for your answer.
>
>
>
> 1. I checked the DOTTreeGenerator.java code but I do not seem to know how
> it finds all the info about a tree. Also I am confused with its use of both
> the stringtemplates and trees (are'nt they mutually exclusive?).
>
>
>
> 2. Yes, the toStringTree() method prints the tree but it only gives the
> leaf nodes, that is the program itself. I have no info about which rule a
> given token belongs to.
>
>
>
> To be more clear, see the attached snapshot. My question is how can I
> capture this parse tree in a some kind of java data structure and walk
> through it.
>
>
>
> Many Thanks again for all your help.
>
> Ketan
>
>
>
> On Mon, Mar 29, 2010 at 5:41 PM, Jim Idle <jimi at temporal-wave.com> wrote:
>
> Look at the code for DOTTreeGenerator.java or use toStringTree() if that
> gives you a good enough representation.
>
> Jim
>
>
> > -----Original Message-----
> > From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> > bounces at antlr.org] On Behalf Of Ketan Maheshwari
> > Sent: Monday, March 29, 2010 7:36 AM
> > To: antlr-interest at antlr.org
> > Subject: [antlr-interest] How to get GUI like tree structure
> >
> > Hello Friends
> >
> > I am trying to use the CommonTree generated by the parser of my grammar
> > against a test code.
> >
> > Using the getChild(index).toString method, I get the tokens well.
> >
> > However, I do not know how can I also get a hierarchy of the rule to
> > which
> > they belong to. Similar to what we get in the ANTLRworks GUI.
> >
> > Any clue how can I get a tree such that it shows complete hierarchy of
> > the
> > grammar and the tokens as leaf nodes only.
> >
> > Am I using the correct Data Structure (CommonTree) ?
> >
> > Thanks for any clues.
> >
> > Regards
> > Ketan
> >
>
> > List: http://www.antlr.org/mailman/listinfo/antlr-interest
> > Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-
> > email-address
>
>
>
>
> List: http://www.antlr.org/mailman/listinfo/antlr-interest
> Unsubscribe:
> http://www.antlr.org/mailman/options/antlr-interest/your-email-address
>
>
>
>
>
>
> List: http://www.antlr.org/mailman/listinfo/antlr-interest
> Unsubscribe:
> http://www.antlr.org/mailman/options/antlr-interest/your-email-address
>