code: public String getMediaQuery(Scope scope, Generator gen) {
          StringBuilder sb = new StringBuilder();
          for (Expression expr : mediaQueries) {
              if (sb.length() > 0) {
                  sb.append(" and ");
              }
              sb.append(expr.eval(scope, gen));
          }
          return sb.toString();
      }
docs: Compiles the effective media query of this section into a string
  
  @param scope the scope used to resolve variables
  @param gen   the generator used to evaluate functions
  @return the effective media query as string or "" if there is no media query