[antlr-interest] Get rule text only if rule was applied

Miguel Ping mblp at mega.ist.utl.pt
Sat Mar 31 13:14:51 PDT 2007

Hi all,

I got this rule:

	: (schemaName DOT)? tableName  alias?
	  {refs.notityTableRef($tableName.text, $alias.text, this.scope);}

But as you can see, if  the alias? part was not applied, $alias.text
throws me a NullPointerException (of course, because $alias does not
exist). How can I check if alias rule was applied?

Miguel Ping

More information about the antlr-interest mailing list