Scala重构重复代码

Question

我是Scala的新手，想弄清楚如何重构下面的代码以避免重复的功能。正如你可以看到那些非常相似，只需要重构为通用代码。

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

我想你需要像水木清华如下：

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)