Parser.parseAtAttribute

Parses an AtAttribute

$(RULEDEF atAttribute): $(LITERAL '@') $(LITERAL Identifier) | $(LITERAL '@') $(LITERAL Identifier) $(LITERAL '(') $(RULE argumentList)? $(LITERAL ')') | $(LITERAL '@') $(LITERAL '(') $(RULE argumentList) $(LITERAL ')') | $(LITERAL '@') $(RULE templateInstance) | $(LITERAL '@') $(RULE templateSingleArgument) ;