Scala 2.9 REPL的settings.maxPrintString是什么意思？

Question

Scala 2.9 REPL的settings.maxPrintString是什么意思？

scalaread-eval-print-loop

18

我想在Scala REPL中禁用字符串值的截断。

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，这在Scala 2.9中似乎无效：

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
       ^

我需要导入什么吗？

我尝试了:power，它使settings可用，但似乎不支持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，但我不确定如何获取一个合适的 InterpreterSettings 实例来进行修改。

- mrg

1个回答

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- retronym · Accepted Answer

  ~/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

或者

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

样例输出将显示截断而不是上限。