Question

我想知道scala是否有相当于java的@SuppressWarnings可以应用于函数或者忽略任何函数发出的弃用警告[1]？

1：我的案例中的相关警告是：method stop in class Thread is deprecated: see corresponding Javadoc for more information.我知道停止的问题，但仍有一些情况由于遗留代码我们必须使用它。

Answer 1

否，此类功能的增强请求[1]已关闭为wontfix。

我同意这会很有用。我希望Scala核心团队不反对这个想法，但他们拥有有限的资源和更高的优先级。

[1] https://issues.scala-lang.org/browse/SI-1781

Answer 2

有一个简单的编译器插件：silencer（有点无耻的插件）

Answer 3

例如，Scala 2.13.2提供了基于ghik的silencer开发的@nowarn注释

import scala.annotation.nowarn
def t = { 0: @nowarn; 1 }

不发出警告，而

def t = { 0; 1 }

给予

warning: a pure expression does nothing in statement position; multiline expressions might require enclosing parentheses
  def t = { 0; 1 }
            ^

Answer 4

以下是禁止显示sbt中所有警告的方法：

import sbt._
import Keys._
import KeyRanks.DTask
import xsbti.{Reporter, Problem, Position, Severity}

private lazy val compilerReporter = TaskKey[xsbti.Reporter](
  "compilerReporter",
  "Experimental hook to listen (or send) compilation failure messages.",
  DTask
)

val ignoreWarnings = Seq(
  compilerReporter in (Compile, compile) :=
    new xsbti.Reporter {
      private val buffer = collection.mutable.ArrayBuffer.empty[Problem]
      def reset(): Unit = buffer.clear()
      def hasErrors: Boolean = buffer.exists(_.severity == Severity.Error)
      def hasWarnings: Boolean = buffer.exists(_.severity == Severity.Warn)
      def printSummary(): Unit = {

        print("\033c")
        if (problems.nonEmpty) {
          problems.foreach{ p =>
            println("=====================================================")
            println(p.position)
            println(p.message)
            println()
            println()
          }
        }
      }
      def problems: Array[Problem] = buffer.toArray

      def log(problem: Problem): Unit = {
        if (problem.severity == Severity.Error) {
          buffer.append(problem)
        }
      }
      def log(pos: Position, msg: String, sev: Severity): Unit = {
        log(new Problem {
          def category: String = "foo"
          def severity: Severity = sev
          def message: String = msg
          def position: Position = pos
        })
      }
      def comment(pos: xsbti.Position, msg: String): Unit = ()
    }
)

Scala中有相当于SuppressWarnings的内容吗？

4 个答案: