lexerAltList: lexerAlt (LBAR lexerAlt)*

def visitLexerAltList(self, ctx: jsgParser.LexerAltListContext):
        """ lexerAltList: lexerAlt (LBAR lexerAlt)* """
        altlist = ctx.lexerAlt()
        self.visit(altlist[0])
        for alt in altlist[1:]:
            self._rulePattern += '|'
            self.visit(alt)