/* Title: Pure/Tools/print_operation.scala
Author: Makarius
Print operations as asynchronous query.
*/
package isabelle
object Print_Operation
{
def print_operations(session: Session): List[(String, String)] =
session.get_protocol_handler("isabelle.Print_Operation$Handler") match {
case Some(handler: Handler) => handler.get
case _ => Nil
}
/* protocol handler */
class Handler extends Session.Protocol_Handler
{
private val print_operations = Synchronized[List[(String, String)]](Nil)
override def init(session: Session): Unit =
session.protocol_command(Markup.PRINT_OPERATIONS)
def get: List[(String, String)] = print_operations.value
private def put(msg: Prover.Protocol_Output): Boolean =
{
val ops =
{
import XML.Decode._
list(pair(string, string))(Symbol.decode_yxml(msg.text))
}
print_operations.change(_ => ops)
true
}
val functions = List(Markup.PRINT_OPERATIONS -> put _)
}
}