Scala-初始化REPL环境 [英] Scala - Initialize REPL environment

问题描述

-嗨.我想将具有初始化环境的Scala REPL嵌入到我的应用中.我看过IMain类，似乎可以通过它的实例来做到这一点.创建该实例，然后将其存储到ILoop的process()中的intp公共变量中.

-Hi. I'd like to embed Scala REPL with initialized environment into my app. I've looked at IMain class and it seems I could do it via instance of it. The instance is created and then stored into intp public var in process() of ILoop.

如何在process()之前(例如，在REPL之前)绑定一些名称和/或添加一些导入内容?

How can I bind some names and/or add some imports before process() (e.g. before REPL)?

以下代码在第3行失败，因为尚未创建intp(=> NPE):

Following code fails on line 3 because intp is not yet created (=> NPE):

    val x = 3
    val interp = new ILoop
    interp.bind("x", x) // -> interp.intp.bind("x", x)
    val settings = new Settings
    settings.usejavacp.value = true
    interp.process(settings)

谢谢您.

更新:不幸的是，覆盖createInterpreter()不起作用:

UPDATE: Overriding createInterpreter() unfortunately doesn't work:

    val x = 3
    val interp = new ILoop {
        override def createInterpreter() {
            super.createInterpreter()
            intp.bind("x", x) // -> interp.intp.bind("x", x)
        }
    }
    val settings = new Settings
    settings.usejavacp.value = true
    interp.process(settings)

解释器卡在输入上(看起来像死锁，仅在上面的代码中发生):

Interpreter is stuck on input (looks like deadlock, happens only with code above):

x: Int = 3
Failed to created JLineReader: java.lang.NoClassDefFoundError: scala/tools/jline/console/completer/Completer
Falling back to SimpleReader.
Welcome to Scala version 2.9.2 (OpenJDK 64-Bit Server VM, Java 1.7.0_06-icedtea).
Type in expressions to have them evaluated.
Type :help for more information.

scala> println
<infinite_sleep>

感谢大家的建议.

推荐答案

有一个名为的github项目. scala-ssh-shell 可能会做您想要的事情，或者至少使您离它更近.

There is a github project called scala-ssh-shell which may do what you want, or at least get you closer.

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