从 Scala 宏访问代码文件和行号？

如何访问 Scala 宏中代码文件的名称和行号？我在看SIP-19 http://docs.scala-lang.org/sips/pending/source-locations.html它说它可以很容易地使用宏来实现......

编辑： 为了澄清，我想要调用者的代码文件和行号。我已经有一个调试宏 https://github.com/pathikrit/scalgos/blob/master/src/main/scala/com/github/pathikrit/scalgos/Macros.scala#L44-L66我想修改它以打印调用者的行号和文件名debug

你要c.macroApplication.pos, where c is for Context.

c.enclosingPosition查找堆栈上最近的具有位置的宏。 （请参阅其他答案。）例如，如果您的断言宏生成一棵树F"%p: $msg"但不分配位置，F宏将失去位置。

字符串插值器宏的示例，F"%p":

  /* Convert enhanced conversions to something format likes.
   * %Q for quotes, %p for position, %Pf for file, %Pn line number,
   * %Pc column %Po offset.
   */
  private def downConvert(parts: List[Tree]): List[Tree] = {
    def fixup(t: Tree): Tree = {
      val Literal(Constant(s: String)) = t
      val r = "(?<!%)%(p|Q|Pf|Po|Pn|Pc)".r
      def p = c.macroApplication.pos
      def f(m: Match): String = m group 1 match {
        case "p"  => p.toString
        case "Pf" => p.source.file.name
        case "Po" => p.point.toString
        case "Pn" => p.line.toString
        case "Pc" => p.column.toString
        case "Q"  => "\""
      }
      val z = r.replaceAllIn(s, f _)
      Literal(Constant(z)) //setPos t.pos
    }
    parts map fixup
  }