[antlr-interest] how to write this rule's tree gramer

[antlr_bill]

Hi ,
I not sure whether I wrote the tree grammer are right , so please take look and give some comments please, that will help a lot.

here is a grammer to parse the java source .
fileDeclaration 
    :   ( (annotations)? packageDeclaration )? (importDeclaration)* (typeDeclaration)* 
    ;
so i defined an imaginary token named FILEDEC and rewrite the tree grammer as 
->^( FILEDEC ( (annotations)? packageDeclaration )? (importDeclaration)* (typeDeclaration)* )
because all in the grammer are rules too. so I used an imaginary token here.

but this one below, there is a ',' can be the root of the subtree
expressionList 
    :   expression (',' expression)*
    ;
so I rewrote the tree as this ,EXP is an imaginary token also
->^(EXP expression (','^ expression)* )

right ? or any better way ? I am really need you help 

Thanks a lot
waitting online :)

BILL YUAN


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