Question

我正在尝试使用我在各种网站上找到的一些信息来编写基本的Scala REPL。我最基本的REPL实现看起来像这样，

import scala.tools.nsc.Settings
import scala.tools.nsc.interpreter._

object BillyREPL extends App {
  val settings = new Settings
  settings.usejavacp.value = true
  settings.deprecation.value = true

  new ILoop().process(settings)
}

使用以下构建设置

import sbt._
import sbt.Keys._

object BillyREPLBuild extends Build {

  lazy val billyrepl = Project(
    id = "billyrepl",
    base = file("."),
    settings = Project.defaultSettings ++ Seq(
      name := "BillyREPL",
      organization := "tv.yobriefcasts",
      version := "0.1-SNAPSHOT",
      scalaVersion := "2.10.1",
      libraryDependencies ++= Seq(
        "org.scala-lang" % "scala-compiler" % "2.10.1",
        "org.scala-lang" % "scala-library" % "2.10.1"
      )
    )
  )
}

尝试运行此操作会导致一些警告和最终错误（我认为这是由初始警告引起的），

Welcome to Scala version 2.10.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_12-ea).
Type in expressions to have them evaluated.
Type :help for more information.

scala>
Failed to initialize compiler: object scala.annotation.Annotation in compiler mirror not found.
** Note that as of 2.8 scala does not assume use of the java classpath.
** For the old behavior pass -usejavacp to scala, or if using a Settings
** object programatically, settings.usejavacp.value = true.

尝试阅读/评估ANYTHING时的错误如下。我不确定这是否是由于一些额外的缺失依赖性而且我确实意识到错误信息表明这不常见但是我想知道在我打开问题之前是否有人曾经处理过此问题？

2

Failed to initialize the REPL due to an unexpected error.
This is a bug, please, report it along with the error diagnostics printed below.
java.lang.NullPointerException
    at scala.tools.nsc.interpreter.ExprTyper$codeParser$.applyRule(ExprTyper.scala:24)
    at scala.tools.nsc.interpreter.ExprTyper$codeParser$.stmts(ExprTyper.scala:35)
    at scala.tools.nsc.interpreter.ExprTyper$$anonfun$parse$2.apply(ExprTyper.scala:43)
    at scala.tools.nsc.interpreter.ExprTyper$$anonfun$parse$2.apply(ExprTyper.scala:42)
    at scala.tools.nsc.reporters.Reporter.withIncompleteHandler(Reporter.scala:51)
    at scala.tools.nsc.interpreter.ExprTyper$class.parse(ExprTyper.scala:42)
    at scala.tools.nsc.interpreter.IMain$exprTyper$.parse(IMain.scala:1074)
    at scala.tools.nsc.interpreter.IMain.parse(IMain.scala:1078)
    at scala.tools.nsc.interpreter.IMain$$anonfun$showCodeIfDebugging$1.apply(IMain.scala:1168)
    at scala.tools.nsc.interpreter.IMain$$anonfun$showCodeIfDebugging$1.apply(IMain.scala:1168)
    at scala.tools.nsc.interpreter.IMain.beSilentDuring(IMain.scala:238)
    at scala.tools.nsc.interpreter.IMain.showCodeIfDebugging(IMain.scala:1168)
    at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.compileAndSaveRun(IMain.scala:800)
    at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.compile(IMain.scala:761)
    at scala.tools.nsc.interpreter.IMain.bind(IMain.scala:618)
    at scala.tools.nsc.interpreter.IMain.bind(IMain.scala:661)
    at scala.tools.nsc.interpreter.IMain$$anonfun$quietBind$1.apply(IMain.scala:660)
    at scala.tools.nsc.interpreter.IMain$$anonfun$quietBind$1.apply(IMain.scala:660)
    at scala.tools.nsc.interpreter.IMain.beQuietDuring(IMain.scala:232)
    at scala.tools.nsc.interpreter.IMain.quietBind(IMain.scala:660)
    at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1$$anonfun$apply$mcZ$sp$2.apply$mcV$sp(ILoop.scala:838)
    at scala.tools.nsc.interpreter.ILoopInit$class.runThunks(ILoopInit.scala:122)
    at scala.tools.nsc.interpreter.ILoop.runThunks(ILoop.scala:42)
    at scala.tools.nsc.interpreter.ILoopInit$class.postInitialization(ILoopInit.scala:95)
    at scala.tools.nsc.interpreter.ILoop.postInitialization(ILoop.scala:42)
    at scala.tools.nsc.interpreter.ILoopInit$$anonfun$createAsyncListener$1.apply$mcV$sp(ILoopInit.scala:63)
    at scala.tools.nsc.interpreter.ILoopInit$$anonfun$createAsyncListener$1.apply(ILoopInit.scala:60)
    at scala.tools.nsc.interpreter.ILoopInit$$anonfun$createAsyncListener$1.apply(ILoopInit.scala:60)
    at scala.tools.nsc.io.package$$anon$3.call(package.scala:40)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
    at java.lang.Thread.run(Thread.java:722)
.

Answer 1

嵌入REPL并且项目使用 sbt 运行时会出现问题。由于类加载器问题（？），从sbt启动自定义解释器不起作用。

您可以尝试使用sbt-assembly构建独立版，并查看是否正确启动。

Answer 2

也许你可以使用这个提示：

How do I use the Scala interpreter in my code?

另见：

How to call the scala interpreter in a Simple Build Tool project?

自定义Scala REPL问题

2 个答案: