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
}
我期望:
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,则缺少最后一个括号(和行尾):text.substring(t.pos.start, t.pos.end)
任何建议如何从 scala.reflect.api.Trees#Tree 对象中提取所有文本?
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 结果与上述输出相同。
将项目添加到 github