Scala重构重复代码

Question

我是 Scala 的新手，正在尝试弄清楚如何重构以下代码以避免重复函数。如您所见，它们非常相似，只需要重构为通用代码即可。

    protected lazy val shardNamesSpec: Parser[Seq[String]] = {
        (ident ^^ {case d => Seq(d)}) | ("(" ~> repsep(ident, ",") <~ ")") ^^ {
          case i => i
        }
      }

    protected lazy val shardTypesSpec: Parser[Seq[DataType]] = {
        (dataType ^^ {case d => Seq(d)}) | ("(" ~> repsep(dataType, ",") <~ ")") ^^ {
          case dt => dt
        }
      }

Answer 1

我想你需要以下内容：

  def parseExpr[T](value: Parser[T]): Parser[Seq[T]] = {
    (value ^^ {case d => Seq(d)}) | ("(" ~> repsep(value, ",") <~ ")") ^^ {
      case i => i
    }

  }

  protected lazy val shardNamesSpec: Parser[Seq[String]] = parseExpr(ident)

  protected lazy val shardTypesSpec: Parser[Seq[DataType]] = parseExpr(dataType)