blob: 7e5698690094bef73c635779d7cfebe23d6e84af (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
/* NSC -- new Scala compiler
* Copyright 2005-2009 LAMP/EPFL
* @author Stepan Koltsov
*/
// $Id$
package scala.tools.nsc
package interpreter
import scala.util.control.Exception._
/** Reads lines from an input stream */
trait InteractiveReader {
import InteractiveReader._
import java.io.IOException
protected def readOneLine(prompt: String): String
val interactive: Boolean
def readLine(prompt: String): String = {
def handler: Catcher[String] = {
case e: IOException if restartSystemCall(e) => readLine(prompt)
}
catching(handler) { readOneLine(prompt) }
}
// hack necessary for OSX jvm suspension because read calls are not restarted after SIGTSTP
private def restartSystemCall(e: Exception): Boolean =
Properties.isMac && (e.getMessage == msgEINTR)
}
object InteractiveReader {
val msgEINTR = "Interrupted system call"
private val exes = List(classOf[Exception], classOf[NoClassDefFoundError])
def createDefault(): InteractiveReader = createDefault(null)
/** Create an interactive reader. Uses <code>JLineReader</code> if the
* library is available, but otherwise uses a <code>SimpleReader</code>.
*/
def createDefault(interpreter: Interpreter): InteractiveReader =
catching(exes: _*)
. opt (new JLineReader(interpreter))
. getOrElse (new SimpleReader)
}
|
