public override LessNode VisitUrl(LessParser.UrlContext context)
        {
            var variableContent = (Variable)context.variableName()?.Accept(this);

            if (variableContent != null)
            {
                return(new Url(variableContent));
            }

            var stringContent = (LessString)context.@string()?.Accept(this);

            if (stringContent != null)
            {
                return(new Url(stringContent));
            }

            var quotedStringContent = (QuotedExpression)context.quotedExpression()?.Accept(this);

            if (quotedStringContent != null)
            {
                return(new Url(quotedStringContent));
            }

            return(new Url(new LessStringLiteral(context.rawUrl()?.GetText())));
        }
 public virtual LessNode VisitUrl(LessParser.UrlContext context)
 {
     throw new System.NotImplementedException();
 }