[antlr-interest] missing attribute access on rule scope when testing token in action section
Dave Carey
dacarey at gmail.com
Sun Oct 21 05:30:55 PDT 2007
I have a question regarding "action section" and testing for the presence of
optional tokens inside them
According to the v3 Definitive Antlr Guide ( section 6.3) you can do
something like this:-
stat: 'if' expr 'then' stat(el='else' stat)?
{
if($el!=null)
System.out.println("found an else");}
|...
;
In fact when I try this same example ( Anrlr 3.0.1) I always get
error(117): Test.g3:116:4: missing attribute access on rule scope: el
You can workaround by access the token contents supplying an attribute e.g.
$el.text: but this doesn't feel right and the guide suggests that it should
work as prescribed.
Can anybody clarify?
Cheers
Dave
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