[antlr-interest] Question concerning writing a TreeParser rule

[Martin Probst]

Hi,

it's probably going to be easier if you modify your rule like this:

batchExprList {
   boolean multi = false;
}	:
	batchExpr (SEP! batchExpr { multi = true; })*	
	{ if (multi) ## = #(#[SEP], ##); }
	;

This gives you the follwing tree:
                     SEP
	/		|		\
       ...              ...		...

instead of
		SEP
          /              \
       SEP        ....
   /       \
...     ....

This way you can have this tree parser rule:

list: #( SEP ( x=expr  { myarraylist.add(x); } )* )

Otherwise you'd have to have a member variable for the tree parser  
(current list root or something), check for it's existence, delete it  
if necessary etc. - this will make it a lot easier.

Martin