[antlr-interest] Bugs generating a tree walker?
Manu
manunews at gmail.com
Sun Jan 21 15:07:01 PST 2007
Hi,
The following problems were found using ANTLR 3.05b.
I'm creating a tree walker and I have noticed two strange things:
1) If you create a rule with a return type like this:
genericTypeArgs[int num_params] returns [Type[] types]
the generated code has a return type of Type not Type[]. Is this a bug
or arrays are not supported?
2) With the following rule:
genericTypeArgs[int num_params] returns [Type[] types]:
^(ARG_LIST (type_names+=typeName)*)
ANTLR gives an error:
error(134): TypeExpressionEval.g:49:69: rule '+=' list labels are not
allowed unless building trees: type_names
However, if I change the rule to return two values:
genericTypeArgs[int num_params] returns [Type[] types, int
aux]: ^(ARG_LIST (type_names+=typeName)*)
it works without changing anything more. Any idea why???
Thanks for the help.
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