Enters a grammar rule by first triggering the generic event {@link ParseTreeListener#enterEveryRule}
then by triggering the event specific to the given parse tree node
@param listener The listener responding to the trigger events
@param r The grammar rule containing the rule context
Enters a grammar rule by first triggering the generic event {@link ParseTreeListener#enterEveryRule} then by triggering the event specific to the given parse tree node @param listener The listener responding to the trigger events @param r The grammar rule containing the rule context