Question

我想在Scala REPL中禁用截断字符串值。

以下主题建议输入settings.maxPrintString = 0：

How to force interpreter show complete stack trace?

不幸的是，这似乎不适用于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
       ^

我需要导入什么东西吗？

我尝试了:power，这使settings可用，但它似乎不支持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

我发现scala.tools.nsc.InterpreterSettings.maxPrintString存在，但我不确定如何获取InterpreterSettings的适当实例进行修改。

Answer 1

  ~/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

其中示例输出将显示截断而没有上限。

scala 2.9 REPL的settings.maxPrintString

1 个答案: