Scala 2.9 REPL 的 settings.maxPrintString [英] settings.maxPrintString for Scala 2.9 REPL

问题描述

我想在 Scala REPL 中禁用字符串值的截断.

I'd like to disable truncation of string values in the Scala REPL.

以下线程建议输入settings.maxPrintString = 0:

如何强制解释器显示完整的堆栈跟踪?

不幸的是，这似乎不适用于 Scala 2.9:

Unfortunately, this doesn't seem to work with Scala 2.9:

Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_29).
Type in expressions to have them evaluated.
Type :help for more information.

scala> settings.maxPrintString = 0
<console>:10: error: not found: value settings
val $ires0 = settings.maxPrintString
             ^
<console>:7: error: not found: value settings
       settings.maxPrintString = 0
       ^

有什么我需要导入的吗?

Is there something I need to import?

我尝试了 :power，它使 settings 可用，但它似乎不支持 maxPrintString:

I tried :power, which makes settings available, but it doesn't seem to support maxPrintString:

scala> :power
** Power User mode enabled - BEEP BOOP SPIZ **
** :phase has been set to 'typer'.          **
** scala.tools.nsc._ has been imported      **
** global._ and definitions._ also imported **
** Try  :help,  vals.<tab>,  power.<tab>    **

scala> settings
res0: scala.tools.nsc.Settings = 
Settings {
  -d = .
  -Yrich-exceptions = true
  -classpath = bin:lib/*
  -encoding = UTF-8
}


scala> settings.maxPrintString = 0
<console>:31: error: value maxPrintString is not a member of scala.tools.nsc.Settings
val $ires9 = settings.maxPrintString
                      ^
<console>:28: error: value maxPrintString is not a member of scala.tools.nsc.Settings
       settings.maxPrintString = 0

我看到 scala.tools.nsc.InterpreterSettings.maxPrintString 存在，但我不确定如何获得 InterpreterSettings 的适当实例进行修改.

I see that scala.tools.nsc.InterpreterSettings.maxPrintString exists, but I'm not sure how to get an appropriate instance of InterpreterSettings to modify.

推荐答案

  ~/code/scala scala29
Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_29).
Type in expressions to have them evaluated.
Type :help for more information.

scala> :power
** Power User mode enabled - BEEP BOOP SPIZ **
** :phase has been set to 'typer'.          **
** scala.tools.nsc._ has been imported      **
** global._ and definitions._ also imported **
** Try  :help,  vals.<tab>,  power.<tab>    **

    scala> vals.isettings.maxPrintString
maxPrintString     maxPrintString_=   

scala> vals.isettings.maxPrintString = 10000
vals.isettings.maxPrintString: Int = 10000

或

$ scala -uniqid -Xprint:typer -Yshow-syms -Dscala.repl.maxprintstring=64000

示例输出将在没有上限的情况下显示截断.

where the sample output will show truncation without the higher limit.

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