Question

Welcome to Scala 2.12.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_121).
Type in expressions for evaluation. Or try :help.

scala> :paste
// Entering paste mode (ctrl-D to finish)

import scala.reflect.runtime._
import scala.reflect.runtime.universe._
import scala.tools.reflect.ToolBox

val mirror = universe.runtimeMirror(universe.getClass.getClassLoader)
val toolbox = mirror.mkToolBox(options = "-Yrangepos")
val text =
  """
    |libraryDependencies ++= Seq("org.scala-lang" % "scala-compiler" % "2.10.4") map {
    |    (dependency) =>{
    |        dependency
    |    }
    |}
  """.stripMargin
val parsed = toolbox.parse(text)

val parsedTrees = parsed match {
  case Block(stmt, expr) =>
    stmt :+ expr
  case t: Tree =>
    Seq(t)
}

val statements = parsedTrees.map { (t: Tree) =>
    text.substring(t.pos.start, t.pos.end)
}


// Exiting paste mode, now interpreting.

import scala.reflect.runtime._
import scala.reflect.runtime.universe._
import scala.tools.reflect.ToolBox
mirror: reflect.runtime.universe.Mirror = JavaMirror with primordial classloader with boot classpath...
scala> statements.head
res0: String =
libraryDependencies ++= Seq("org.scala-lang" % "scala-compiler" % "2.10.4") map {
    (dependency) =>{
        dependency
    }

结果是：

scala> statements.head
res1: String =
libraryDependencies ++= Seq("org.scala-lang" % "scala-compiler" % "2.10.4") map {
    (dependency) =>{
        dependency
    }

我期待：

libraryDependencies ++= Seq("org.scala-lang" % "scala-compiler" % "2.10.4") map {
    (dependency) =>{
        dependency
    }
}

如果我使用Tree对象中的位置，则会丢失最后一个括号}（和行尾）：text.substring(t.pos.start, t.pos.end)

有关如何从scala.reflect.api提取所有文本的任何建议#Tree＃Tree对象？

更新

受影响的scala版本：

2.10.6 - sbt 0.13.x需要
2.11.8
2.12.7

对于scala 2.10.6 / 2.12.7，结果与上面的输出相同。

将项目添加到github

Example project for searching the solution

Answer 1

只是将问题移出未答复的列表，可以参考为其预订的问题：

https://issues.scala-lang.org/browse/SI-8859

Scala解析器削减最后一个括号

1 个答案: