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我刚刚开始研究外部 DSL,但是遇到了一个问题。我写了一个非常简单的测试,我使用 Scala 2.9.0-1 和 scalatest 1.6.1:

class DSLTest extends FlatSpec with ShouldMatchers {

  object DSL extends JavaTokenParsers {

    def test = stringLiteral

    def apply(s: String): Either[String, String] = parseAll(test, s) match {
      case Success(tree, _) => Right(tree.toString)
      case NoSuccess(msg, _) => Left("Bad syntax: " + msg)
    }

  }

  "DSL" should "parse ABC" in {
    val input = "ABC"
    DSL(input) match {
      case Right(r) =>
        r should be === """(ABC)""""
      case Left(msg) =>
        fail(msg)
    }
  }

}

如果我运行它,它会在解析过程中失败并返回:

语法错误:字符串匹配正则表达式 `"([^"\p{Cntrl}\\]|\\[\\/bfnrt]|\\u[a-fA-F0-9]{4})*"' 预期但是找到了“A”

任何想法我做错了什么?我基本上遵循了 Dean Wampler 的书(http://ofps.oreilly.com/titles/9780596155957/DomainSpecificLanguages.html)。

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1 回答 1

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AstringLiteral是这样的:

"I am a string literal because I'm between double quotes"

如果您像下面这样声明输入,它应该可以工作:

val input = "\"ABC\""

再一次,在正确的情况下有一个错误:

    r should be === """(ABC)""""

应该写

    r should be === """"(ABC)""""
于 2011-07-27T18:42:37.307 回答