[antlr-interest] Tree Construction - DOT operator

[Adrian Sanchez]

Hi guys,


 


I’m just new to Antlr (just started studying it last week)
and I want to ask for your help.  I’m trying to learn about tree construction/tree
parsing and was stumped with this problem.  


 


See, I’m trying to create an AST from the following rules
(this is based on the Python grammar in the antlr site):


 




primary : atom (trailer)*;


                                               





trailer : '.' ID  //e.g. Rect1.Width”;


                                               



args : ID (',' ID)*;


 


I was wondering how I could represent the AST for
primary.  I was thinking of something like:


 


1.      
->  atom
             //if
there is no trailer


2.      
->  ^(GETMEMBER atom ID)  //if
there is a trailer


 


This sounds like a pretty simple and common scenario so I’m
sure you guys can help.  Thanks.






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