diff -r 806ea6e282e4 -r ac7961d42ac3 src/Pure/Thy/command.scala
--- a/src/Pure/Thy/command.scala	Wed May 05 15:30:01 2010 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,100 +0,0 @@
-/*
- * Prover commands with semantic state
- *
- * @author Johannes Hölzl, TU Munich
- * @author Fabian Immler, TU Munich
- */
-
-package isabelle
-
-
-import scala.actors.Actor, Actor._
-import scala.collection.mutable
-
-
-object Command
-{
-  object Status extends Enumeration
-  {
-    val UNPROCESSED = Value("UNPROCESSED")
-    val FINISHED = Value("FINISHED")
-    val FAILED = Value("FAILED")
-  }
-
-  case class HighlightInfo(highlight: String) { override def toString = highlight }
-  case class TypeInfo(ty: String)
-  case class RefInfo(file: Option[String], line: Option[Int],
-    command_id: Option[String], offset: Option[Int])
-}
-
-
-class Command(
-    val id: Isar_Document.Command_ID,
-    val span: Thy_Syntax.Span)
-  extends Session.Entity
-{
-  /* classification */
-
-  def is_command: Boolean = !span.isEmpty && span.head.is_command
-  def is_ignored: Boolean = span.forall(_.is_ignored)
-  def is_malformed: Boolean = !is_command && !is_ignored
-
-  def name: String = if (is_command) span.head.content else ""
-  override def toString = if (is_command) name else if (is_ignored) "<ignored>" else "<malformed>"
-
-
-  /* source text */
-
-  val source: String = span.map(_.source).mkString
-  def source(i: Int, j: Int): String = source.substring(i, j)
-  def length: Int = source.length
-
-  lazy val symbol_index = new Symbol.Index(source)
-
-
-  /* accumulated messages */
-
-  @volatile protected var state = new State(this)
-  def current_state: State = state
-
-  private case class Consume(session: Session, message: XML.Tree)
-  private case object Assign
-
-  private val accumulator = actor {
-    var assigned = false
-    loop {
-      react {
-        case Consume(session: Session, message: XML.Tree) if !assigned =>
-          state = state.+(session, message)
-
-        case Assign =>
-          assigned = true  // single assignment
-          reply(())
-
-        case bad => System.err.println("command accumulator: ignoring bad message " + bad)
-      }
-    }
-  }
-
-  def consume(session: Session, message: XML.Tree) { accumulator ! Consume(session, message) }
-
-  def assign_state(state_id: Isar_Document.State_ID): Command =
-  {
-    val cmd = new Command(state_id, span)
-    accumulator !? Assign
-    cmd.state = current_state
-    cmd
-  }
-
-
-  /* markup */
-
-  lazy val empty_markup = new Markup_Text(Nil, source)
-
-  def markup_node(begin: Int, end: Int, info: Any): Markup_Tree =
-  {
-    val start = symbol_index.decode(begin)
-    val stop = symbol_index.decode(end)
-    new Markup_Tree(new Markup_Node(start, stop, info), Nil)
-  }
-}