Hello all,
I think I should probably apologize in advance for this question
because (a) it's probably really obvious and (b) I know it's been
asked before but as a newbie I've had trouble understanding the
previous posts or finding the solution in the book.
In my parser grammar:
expr_list : (expr (',' expr)* )? -> ^(EXPR_LIST expr*) ;
In my tree grammar:
expr_list returns [List<Double> values] : ^(EXPR_LIST expr*)
{ $values = new ArrayList<Double>();
int n = $EXPR_LIST.getChildCount();
for (int i = 0; i < n; i++) {
$values.add($expr.value);
}
}
;
Yuck !! I can see I'm doing ANTLR's work here insstead of letting it
work for me - but I haven't been able to see how to collect the values
of 0 or more expressions. I understand that I can't use list label
syntax here because I don't have output=AST for the tree grammar. I
can see by looking at the generated walker code that there is a loop
iterating through the expr values, after which my ugly code does the
same thing !
I'd be pathetically grateful if someone could point me in the right
direction here :-)
Michael
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