[antlr-interest] How to use java parser to grab expressions from source?

paul taney paultaney at yahoo.com
Thu Jul 10 13:37:42 PDT 2003


You might want to start with Andy Tripp's
java beautifier.  It's working for me, as
I try to emit jython.  You have to put back
parens and semis and things that were torn off.  
His code does that.



--- charlweed <charlweed at yahoo.com> wrote:
> To make a long story short, I have a personal
> project to add 
> a "replace fields with setters" function to the
> Netbeans Java editor. 
> All I want to do (at the moment) is be able to
> transform Java source 
> code by replacing instances of 
>     someIndentifier = <expression>; 
> with 
>     setSomeIndentifier(<expression>);
> For all valid expressions.
> After much experimenting with the example Java stuff
> in the antlr 
> distribution, it seems that the original source is
> not stored in the 
> finished AST tree. 
> Accordingly, I am currently trying to augment the
> expression() or 
> assignmentExpression() method in JavaRecognizer, but
> I'm stumbling 
> around in the dark. I tried a method to transform
> the AST variable 
> expression_AST back into source code by walking it
> and it's sub 
> nodes. However:
> (A) the AST tree seems to be empty for the life of
> these calls , and 
> (B) I still can't find the original source.
> I get the (sinking) feeling that I need to extend
> several classes, 
> and use them instead of the defaults, but even after
> walking through 
> the tutorial, I'm afraid I don't know where to start
> for 
> JavaRecognizer and/or JavaLexer.
> Any tips or pointers would be very much appreciated.
> Thank you!
> Charlweed 
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