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/* NSC -- new Scala compiler
* Copyright 2005-2010 LAMP/EPFL
* @author Stepan Koltsov
*/
package scala.tools.nsc
package interpreter
import java.io.IOException
import java.nio.channels.ClosedByInterruptException
import scala.util.control.Exception._
import InteractiveReader._
/** Reads lines from an input stream */
trait InteractiveReader {
protected def readOneLine(prompt: String): String
val interactive: Boolean
def init(): Unit = ()
def readLine(prompt: String): String = {
def handler: Catcher[String] = {
case e: ClosedByInterruptException => error("Reader closed by interrupt.")
// Terminal has to be re-initialized after SIGSTP or up arrow etc. stop working.
case e: IOException if restartSystemCall(e) => init() ; readLine(prompt)
}
catching(handler) { readOneLine(prompt) }
}
// override if history is available
def history: Option[History] = None
def historyList = history map (_.asList) getOrElse Nil
// override if completion is available
def completion: Option[Completion] = None
// 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"
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 =
try new JLineReader(interpreter)
catch {
case e @ (_: Exception | _: NoClassDefFoundError) =>
// println("Failed to create JLineReader(%s): %s".format(interpreter, e))
new SimpleReader
}
}
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