src/Pure/PIDE/document.scala
author wenzelm
Sun Feb 26 16:58:28 2012 +0100 (2012-02-26)
changeset 46679 bce11e807488
parent 46678 c2dba08548f9
child 46680 234f1730582d
permissions -rw-r--r--
more abstract class Document.History;
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/*  Title:      Pure/PIDE/document.scala
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    Author:     Makarius
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Document as collection of named nodes, each consisting of an editable
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list of commands, associated with asynchronous execution process.
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*/
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package isabelle
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import scala.collection.mutable
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object Document
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{
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  /* formal identifiers */
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  type ID = Long
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  val ID = Properties.Value.Long
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  type Version_ID = ID
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  type Command_ID = ID
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  type Exec_ID = ID
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  val no_id: ID = 0
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  val new_id = Counter()
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  /** document structure **/
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  /* named nodes -- development graph */
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  type Edit[A, B] = (Node.Name, Node.Edit[A, B])
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  type Edit_Text = Edit[Text.Edit, Text.Perspective]
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  type Edit_Command = Edit[(Option[Command], Option[Command]), Command.Perspective]
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  type Node_Header = Exn.Result[Thy_Header]
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  object Node
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  {
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    object Name
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    {
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      val empty = Name("", "", "")
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      def apply(path: Path): Name =
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      {
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        val node = path.implode
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        val dir = path.dir.implode
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        val theory = Thy_Header.thy_name(node) getOrElse error("Bad theory file name: " + path)
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        Name(node, dir, theory)
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      }
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    }
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    sealed case class Name(node: String, dir: String, theory: String)
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    {
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      override def hashCode: Int = node.hashCode
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      override def equals(that: Any): Boolean =
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        that match {
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          case other: Name => node == other.node
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          case _ => false
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        }
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      override def toString: String = theory
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    }
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    sealed abstract class Edit[A, B]
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    {
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      def foreach(f: A => Unit)
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      {
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        this match {
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          case Edits(es) => es.foreach(f)
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          case _ =>
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        }
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      }
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    }
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    case class Clear[A, B]() extends Edit[A, B]
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    case class Edits[A, B](edits: List[A]) extends Edit[A, B]
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    case class Header[A, B](header: Node_Header) extends Edit[A, B]
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    case class Perspective[A, B](perspective: B) extends Edit[A, B]
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    def norm_header(f: String => String, g: String => String, header: Node_Header): Node_Header =
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      header match {
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        case Exn.Res(h) => Exn.capture { h.norm_deps(f, g) }
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        case exn => exn
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      }
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    val empty: Node = Node()
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    def command_starts(commands: Iterator[Command], offset: Text.Offset = 0)
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      : Iterator[(Command, Text.Offset)] =
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    {
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      var i = offset
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      for (command <- commands) yield {
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        val start = i
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        i += command.length
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        (command, start)
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      }
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    }
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  }
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  private val block_size = 1024
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  sealed case class Node(
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    val header: Node_Header = Exn.Exn(ERROR("Bad theory header")),
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    val perspective: Command.Perspective = Command.Perspective.empty,
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    val blobs: Map[String, Blob] = Map.empty,
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    val commands: Linear_Set[Command] = Linear_Set.empty)
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  {
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    def clear: Node = Node.empty.copy(header = header)
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    /* commands */
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    private lazy val full_index: (Array[(Command, Text.Offset)], Text.Range) =
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    {
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      val blocks = new mutable.ListBuffer[(Command, Text.Offset)]
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      var next_block = 0
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      var last_stop = 0
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      for ((command, start) <- Node.command_starts(commands.iterator)) {
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        last_stop = start + command.length
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        while (last_stop + 1 > next_block) {
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          blocks += (command -> start)
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          next_block += block_size
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        }
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      }
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      (blocks.toArray, Text.Range(0, last_stop))
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    }
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    def full_range: Text.Range = full_index._2
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    def command_range(i: Text.Offset = 0): Iterator[(Command, Text.Offset)] =
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    {
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      if (!commands.isEmpty && full_range.contains(i)) {
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        val (cmd0, start0) = full_index._1(i / block_size)
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        Node.command_starts(commands.iterator(cmd0), start0) dropWhile {
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          case (cmd, start) => start + cmd.length <= i }
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      }
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      else Iterator.empty
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    }
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    def command_range(range: Text.Range): Iterator[(Command, Text.Offset)] =
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      command_range(range.start) takeWhile { case (_, start) => start < range.stop }
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    def command_at(i: Text.Offset): Option[(Command, Text.Offset)] =
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    {
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      val range = command_range(i)
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      if (range.hasNext) Some(range.next) else None
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    }
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    def proper_command_at(i: Text.Offset): Option[Command] =
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      command_at(i) match {
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        case Some((command, _)) =>
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          commands.reverse_iterator(command).find(cmd => !cmd.is_ignored)
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        case None => None
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      }
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    def command_start(cmd: Command): Option[Text.Offset] =
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      Node.command_starts(commands.iterator).find(_._1 == cmd).map(_._2)
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  }
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  /** versioning **/
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  /* particular document versions */
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  type Nodes = Map[Node.Name, Node]
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  object Version
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  {
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    val init: Version = Version()
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  }
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  sealed case class Version(
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    val id: Version_ID = no_id,
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    val nodes: Nodes = Map.empty.withDefaultValue(Node.empty))
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  {
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    def topological_order: List[Node.Name] =
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    {
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      val names = nodes.map({ case (name, node) => (name.node -> name) })
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      def next(x: Node.Name): List[Node.Name] =
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        nodes(x).header match {
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          case Exn.Res(header) =>
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            for (imp <- header.imports; name <- names.get(imp)) yield(name)
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          case Exn.Exn(_) => Nil
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        }
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      Library.topological_order(next, nodes.keys.toList.sortBy(_.node))
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    }
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  }
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  /* changes of plain text, eventually resulting in document edits */
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  object Change
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  {
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    val init: Change = new Change()
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    def make(previous: Future[Version], edits: List[Edit_Text], version: Future[Version]): Change =
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      new Change(Some(previous), edits, version)
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  }
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  class Change private(
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    val previous: Option[Future[Version]] = Some(Future.value(Version.init)),
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    val edits: List[Edit_Text] = Nil,
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    val version: Future[Version] = Future.value(Version.init))
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  {
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    def is_finished: Boolean =
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      (previous match { case None => true case Some(future) => future.is_finished }) &&
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      version.is_finished
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    def truncate: Change = new Change(None, Nil, version)
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  }
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  /* history navigation */
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  object History
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  {
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    val init: History = new History()
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  }
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  class History private(
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    val undo_list: List[Change] = List(Change.init))  // non-empty list
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  {
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    def tip: Change = undo_list.head
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    def + (change: Change): History = new History(change :: undo_list)
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    def prune(check: Change => Boolean, retain: Int): Option[(List[Change], History)] =
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    {
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      val n = undo_list.iterator.zipWithIndex.find(p => check(p._1)).get._2 + 1
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      val (retained, dropped) = undo_list.splitAt(n max retain)
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      retained.splitAt(retained.length - 1) match {
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        case (prefix, List(last)) => Some(dropped, new History(prefix ::: List(last.truncate)))
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        case _ => None
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      }
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    }
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  }
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  /** global state -- document structure, execution process, editing history **/
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  abstract class Snapshot
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  {
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    val state: State
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    val version: Version
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    val node: Node
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    val is_outdated: Boolean
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    def convert(i: Text.Offset): Text.Offset
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    def convert(range: Text.Range): Text.Range
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    def revert(i: Text.Offset): Text.Offset
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    def revert(range: Text.Range): Text.Range
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    def cumulate_markup[A](range: Text.Range, info: A, elements: Option[Set[String]],
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      result: PartialFunction[(A, Text.Markup), A]): Stream[Text.Info[A]]
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    def select_markup[A](range: Text.Range, elements: Option[Set[String]],
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      result: PartialFunction[Text.Markup, A]): Stream[Text.Info[A]]
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  }
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  type Assign =
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   (List[(Document.Command_ID, Option[Document.Exec_ID])],  // exec state assignment
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    List[(String, Option[Document.Command_ID])])  // last exec
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  val no_assign: Assign = (Nil, Nil)
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  object State
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  {
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    class Fail(state: State) extends Exception
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    val init: State =
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      State().define_version(Version.init, Assignment.init).assign(Version.init.id, no_assign)._2
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    object Assignment
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    {
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      val init: Assignment = Assignment()
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    }
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    case class Assignment(
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      val command_execs: Map[Command_ID, Exec_ID] = Map.empty,
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      val last_execs: Map[String, Option[Command_ID]] = Map.empty,
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      val is_finished: Boolean = false)
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    {
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      def check_finished: Assignment = { require(is_finished); this }
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      def unfinished: Assignment = copy(is_finished = false)
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      def assign(add_command_execs: List[(Command_ID, Option[Exec_ID])],
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        add_last_execs: List[(String, Option[Command_ID])]): Assignment =
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      {
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        require(!is_finished)
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        val command_execs1 =
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          (command_execs /: add_command_execs) {
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            case (res, (command_id, None)) => res - command_id
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            case (res, (command_id, Some(exec_id))) => res + (command_id -> exec_id)
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          }
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        Assignment(command_execs1, last_execs ++ add_last_execs, true)
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      }
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    }
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  }
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  sealed case class State(
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    val versions: Map[Version_ID, Version] = Map.empty,
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    val commands: Map[Command_ID, Command.State] = Map.empty,  // static markup from define_command
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    val execs: Map[Exec_ID, Command.State] = Map.empty,  // dynamic markup from execution
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    val assignments: Map[Version_ID, State.Assignment] = Map.empty,
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    val history: History = History.init)
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  {
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    private def fail[A]: A = throw new State.Fail(this)
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    def define_version(version: Version, assignment: State.Assignment): State =
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    {
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      val id = version.id
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      copy(versions = versions + (id -> version),
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        assignments = assignments + (id -> assignment.unfinished))
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    }
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    def define_command(command: Command): State =
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    {
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      val id = command.id
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      copy(commands = commands + (id -> command.empty_state))
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    }
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    def defined_command(id: Command_ID): Boolean = commands.isDefinedAt(id)
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    def find_command(version: Version, id: ID): Option[(Node, Command)] =
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      commands.get(id) orElse execs.get(id) match {
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        case None => None
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        case Some(st) =>
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          val command = st.command
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          version.nodes.get(command.node_name).map((_, command))
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      }
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    def the_version(id: Version_ID): Version = versions.getOrElse(id, fail)
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    def the_command(id: Command_ID): Command.State = commands.getOrElse(id, fail)  // FIXME rename
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    def the_exec(id: Exec_ID): Command.State = execs.getOrElse(id, fail)
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    def the_assignment(version: Version): State.Assignment =
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      assignments.getOrElse(version.id, fail)
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    def accumulate(id: ID, message: XML.Elem): (Command.State, State) =
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      execs.get(id) match {
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        case Some(st) =>
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          val new_st = st + message
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          (new_st, copy(execs = execs + (id -> new_st)))
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        case None =>
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          commands.get(id) match {
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            case Some(st) =>
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              val new_st = st + message
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              (new_st, copy(commands = commands + (id -> new_st)))
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            case None => fail
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          }
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      }
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    def assign(id: Version_ID, arg: Assign): (List[Command], State) =
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    {
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      val version = the_version(id)
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      val (command_execs, last_execs) = arg
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      val (changed_commands, new_execs) =
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        ((Nil: List[Command], execs) /: command_execs) {
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          case ((commands1, execs1), (cmd_id, exec)) =>
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            val st = the_command(cmd_id)
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            val commands2 = st.command :: commands1
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            val execs2 =
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              exec match {
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                case None => execs1
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                case Some(exec_id) => execs1 + (exec_id -> st)
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   364
              }
wenzelm@44543
   365
            (commands2, execs2)
wenzelm@38370
   366
        }
wenzelm@44477
   367
      val new_assignment = the_assignment(version).assign(command_execs, last_execs)
wenzelm@43722
   368
      val new_state = copy(assignments = assignments + (id -> new_assignment), execs = new_execs)
wenzelm@44476
   369
wenzelm@44543
   370
      (changed_commands, new_state)
wenzelm@38370
   371
    }
wenzelm@38370
   372
wenzelm@38417
   373
    def is_assigned(version: Version): Boolean =
wenzelm@43722
   374
      assignments.get(version.id) match {
wenzelm@38370
   375
        case Some(assgn) => assgn.is_finished
wenzelm@38370
   376
        case None => false
wenzelm@38370
   377
      }
wenzelm@38370
   378
wenzelm@44436
   379
    def is_stable(change: Change): Boolean =
wenzelm@44436
   380
      change.is_finished && is_assigned(change.version.get_finished)
wenzelm@44436
   381
wenzelm@44672
   382
    def recent_stable: Change = history.undo_list.find(is_stable) getOrElse fail
wenzelm@44436
   383
    def tip_stable: Boolean = is_stable(history.tip)
wenzelm@44475
   384
    def tip_version: Version = history.tip.version.get_finished
wenzelm@44436
   385
wenzelm@44615
   386
    def last_exec_offset(name: Node.Name): Text.Offset =
wenzelm@44484
   387
    {
wenzelm@44484
   388
      val version = tip_version
wenzelm@44615
   389
      the_assignment(version).last_execs.get(name.node) match {
wenzelm@44484
   390
        case Some(Some(id)) =>
wenzelm@44484
   391
          val node = version.nodes(name)
wenzelm@44484
   392
          val cmd = the_command(id).command
wenzelm@44484
   393
          node.command_start(cmd) match {
wenzelm@44484
   394
            case None => 0
wenzelm@44484
   395
            case Some(start) => start + cmd.length
wenzelm@44484
   396
          }
wenzelm@44484
   397
        case _ => 0
wenzelm@44484
   398
      }
wenzelm@44484
   399
    }
wenzelm@44484
   400
wenzelm@44446
   401
    def continue_history(
wenzelm@44446
   402
        previous: Future[Version],
wenzelm@40479
   403
        edits: List[Edit_Text],
wenzelm@43722
   404
        version: Future[Version]): (Change, State) =
wenzelm@38841
   405
    {
wenzelm@46678
   406
      val change = Change.make(previous, edits, version)
wenzelm@38841
   407
      (change, copy(history = history + change))
wenzelm@38841
   408
    }
wenzelm@38841
   409
wenzelm@44672
   410
    def prune_history(retain: Int = 0): (List[Version], State) =
wenzelm@44672
   411
    {
wenzelm@46679
   412
      history.prune(is_stable, retain) match {
wenzelm@46679
   413
        case Some((dropped, history1)) =>
wenzelm@44672
   414
          val dropped_versions = dropped.map(change => change.version.get_finished)
wenzelm@46679
   415
          val state1 = copy(history = history1)
wenzelm@44672
   416
          (dropped_versions, state1)
wenzelm@46679
   417
        case None => fail
wenzelm@44672
   418
      }
wenzelm@44672
   419
    }
wenzelm@44672
   420
wenzelm@44676
   421
    def removed_versions(removed: List[Version_ID]): State =
wenzelm@44676
   422
    {
wenzelm@44676
   423
      val versions1 = versions -- removed
wenzelm@44676
   424
      val assignments1 = assignments -- removed
wenzelm@44676
   425
      var commands1 = Map.empty[Command_ID, Command.State]
wenzelm@44676
   426
      var execs1 = Map.empty[Exec_ID, Command.State]
wenzelm@44676
   427
      for {
wenzelm@44676
   428
        (version_id, version) <- versions1.iterator
wenzelm@44676
   429
        val command_execs = assignments1(version_id).command_execs
wenzelm@44676
   430
        (_, node) <- version.nodes.iterator
wenzelm@44676
   431
        command <- node.commands.iterator
wenzelm@44676
   432
      } {
wenzelm@44676
   433
        val id = command.id
wenzelm@44676
   434
        if (!commands1.isDefinedAt(id) && commands.isDefinedAt(id))
wenzelm@44676
   435
          commands1 += (id -> commands(id))
wenzelm@44676
   436
        if (command_execs.isDefinedAt(id)) {
wenzelm@44676
   437
          val exec_id = command_execs(id)
wenzelm@44676
   438
          if (!execs1.isDefinedAt(exec_id) && execs.isDefinedAt(exec_id))
wenzelm@44676
   439
            execs1 += (exec_id -> execs(exec_id))
wenzelm@44676
   440
        }
wenzelm@44676
   441
      }
wenzelm@44676
   442
      copy(versions = versions1, commands = commands1, execs = execs1, assignments = assignments1)
wenzelm@44676
   443
    }
wenzelm@44676
   444
wenzelm@44613
   445
    def command_state(version: Version, command: Command): Command.State =
wenzelm@44613
   446
    {
wenzelm@44613
   447
      require(is_assigned(version))
wenzelm@44613
   448
      try {
wenzelm@44613
   449
        the_exec(the_assignment(version).check_finished.command_execs
wenzelm@44613
   450
          .getOrElse(command.id, fail))
wenzelm@44613
   451
      }
wenzelm@44613
   452
      catch { case _: State.Fail => command.empty_state }
wenzelm@44613
   453
    }
wenzelm@44613
   454
wenzelm@38841
   455
wenzelm@38841
   456
    // persistent user-view
wenzelm@44615
   457
    def snapshot(name: Node.Name, pending_edits: List[Text.Edit]): Snapshot =
wenzelm@38370
   458
    {
wenzelm@44672
   459
      val stable = recent_stable
wenzelm@44436
   460
      val latest = history.tip
wenzelm@38841
   461
wenzelm@44156
   462
      // FIXME proper treatment of removed nodes
wenzelm@38841
   463
      val edits =
wenzelm@38841
   464
        (pending_edits /: history.undo_list.takeWhile(_ != stable))((edits, change) =>
wenzelm@44156
   465
            (for ((a, Node.Edits(es)) <- change.edits if a == name) yield es).flatten ::: edits)
wenzelm@38841
   466
      lazy val reverse_edits = edits.reverse
wenzelm@38841
   467
wenzelm@38841
   468
      new Snapshot
wenzelm@38841
   469
      {
wenzelm@44582
   470
        val state = State.this
wenzelm@39698
   471
        val version = stable.version.get_finished
wenzelm@38841
   472
        val node = version.nodes(name)
wenzelm@38841
   473
        val is_outdated = !(pending_edits.isEmpty && latest == stable)
wenzelm@38841
   474
wenzelm@38841
   475
        def convert(offset: Text.Offset) = (offset /: edits)((i, edit) => edit.convert(i))
wenzelm@38841
   476
        def revert(offset: Text.Offset) = (offset /: reverse_edits)((i, edit) => edit.revert(i))
wenzelm@43425
   477
        def convert(range: Text.Range) = (range /: edits)((r, edit) => edit.convert(r))
wenzelm@43425
   478
        def revert(range: Text.Range) = (range /: reverse_edits)((r, edit) => edit.revert(r))
wenzelm@39177
   479
wenzelm@46178
   480
        def cumulate_markup[A](range: Text.Range, info: A, elements: Option[Set[String]],
wenzelm@46178
   481
          result: PartialFunction[(A, Text.Markup), A]): Stream[Text.Info[A]] =
wenzelm@45459
   482
        {
wenzelm@45467
   483
          val former_range = revert(range)
wenzelm@45459
   484
          for {
wenzelm@45459
   485
            (command, command_start) <- node.command_range(former_range).toStream
wenzelm@46208
   486
            Text.Info(r0, a) <- state.command_state(version, command).markup.
wenzelm@46178
   487
              cumulate[A]((former_range - command_start).restrict(command.range), info, elements,
wenzelm@46178
   488
                {
wenzelm@46178
   489
                  case (a, Text.Info(r0, b))
wenzelm@46178
   490
                  if result.isDefinedAt((a, Text.Info(convert(r0 + command_start), b))) =>
wenzelm@46178
   491
                    result((a, Text.Info(convert(r0 + command_start), b)))
wenzelm@46178
   492
                })
wenzelm@45459
   493
          } yield Text.Info(convert(r0 + command_start), a)
wenzelm@45459
   494
        }
wenzelm@45459
   495
wenzelm@46178
   496
        def select_markup[A](range: Text.Range, elements: Option[Set[String]],
wenzelm@46198
   497
          result: PartialFunction[Text.Markup, A]): Stream[Text.Info[A]] =
wenzelm@38845
   498
        {
wenzelm@45468
   499
          val result1 =
wenzelm@45468
   500
            new PartialFunction[(Option[A], Text.Markup), Option[A]] {
wenzelm@45468
   501
              def isDefinedAt(arg: (Option[A], Text.Markup)): Boolean = result.isDefinedAt(arg._2)
wenzelm@45468
   502
              def apply(arg: (Option[A], Text.Markup)): Option[A] = Some(result(arg._2))
wenzelm@45468
   503
            }
wenzelm@46198
   504
          for (Text.Info(r, Some(x)) <- cumulate_markup(range, None, elements, result1))
wenzelm@46198
   505
            yield Text.Info(r, x)
wenzelm@38845
   506
        }
wenzelm@38841
   507
      }
wenzelm@38150
   508
    }
wenzelm@34485
   509
  }
wenzelm@34840
   510
}
wenzelm@34840
   511