在Scala中实现了有趣的DSL？

问题描述

我见过（博客： ）

测试框架如是DSL的经典示例：

 测试（在空堆栈上调用pop ）{
 val emptyStack = new Stack [String] 
评估{emptyStack.pop（）}应该产生[NoSuchElementException] 
 emptyStack应该是（'empty）
} 
  

还有很多其他基于DSL的框架：

• ：行为驱动的设计框架






• ：一种Scala ORM和DSL，用于以最小的冗长程度和最大的类型安全性与数据库进行对话

 
 def songCountByArtistId：Query [GroupWithMeasures [Long，Long]] = 
来自（艺术家，歌曲）（（a，s] => 
其中（a.id === s.artistId）
 groupBy（a.id）
compute（count）
）
 

I've seen BASIC and Apache Camel DSLs in Scala, and they're just fantastic. Any more examples of such DSLs?

解决方案

You have a good source in the MEAP (Early Access) book

DSL in action from Debasish Ghosh (blog: "Ruminations of a programmer)

Testing frameworks like scalatest are classic examples of DSL:

  test("pop is invoked on an empty stack") {     
    val emptyStack = new Stack[String]
    evaluating { emptyStack.pop() } should produce [NoSuchElementException]
    emptyStack should be ('empty)
  }

There are many others DSL-based frameworks out there:

• specs: "Behaviour-Driven-Design framework"

• internal DSLs

• Squeryl: "A Scala ORM and DSL for talking with Databases with minimum verbosity and maximum type safety"

    def songCountByArtistId: Query[GroupWithMeasures[Long,Long]] =
      from(artists, songs)((a,s) =>
        where(a.id === s.artistId)
        groupBy(a.id)
        compute(count)
      )

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