src/Pure/PIDE/document.scala
author wenzelm
Sat Sep 03 12:31:27 2011 +0200 (2011-09-03)
changeset 44672 07dad1433cd7
parent 44642 446fe2abe252
child 44676 7de87f1ae965
permissions -rw-r--r--
some support to prune_history;
clarified signature: recent_stable is supposed to be always defined;
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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 = new 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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    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 =
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      Node(Exn.Exn(ERROR("Bad theory header")), Command.Perspective.empty, Map(), Linear_Set())
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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,
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    val perspective: Command.Perspective,
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    val blobs: Map[String, Blob],
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    val commands: Linear_Set[Command])
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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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      command_starts.find(_._1 == cmd).map(_._2)
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    def command_starts: Iterator[(Command, Text.Offset)] =
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      Node.command_starts(commands.iterator)
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  }
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  /** versioning **/
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  /* particular document versions */
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  object Version
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  {
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    val init: Version = Version(no_id, Map().withDefaultValue(Node.empty))
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  }
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  type Nodes = Map[Node.Name, Node]
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  sealed case class Version(val id: Version_ID, val nodes: Nodes)
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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 = Change(Some(Future.value(Version.init)), Nil, Future.value(Version.init))
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  }
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  sealed case class Change(
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    val previous: Option[Future[Version]],
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    val edits: List[Edit_Text],
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    val version: Future[Version])
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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 = copy(previous = None, edits = Nil)
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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 = History(List(Change.init))
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  }
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  // FIXME pruning, purging of state
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  sealed case class History(val undo_list: List[Change])
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  {
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    require(!undo_list.isEmpty)
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    def tip: Change = undo_list.head
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    def +(change: Change): History = copy(undo_list = change :: undo_list)
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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 command_state(command: Command): Command.State
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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 select_markup[A](range: Text.Range)(result: Markup_Tree.Select[A])
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      : Stream[Text.Info[Option[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(Map.empty, Map.empty, false)
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    }
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    case class Assignment(
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      val command_execs: Map[Command_ID, Exec_ID],
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      val last_execs: Map[String, Option[Command_ID]],
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      val is_finished: Boolean)
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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(),
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    val commands: Map[Command_ID, Command.State] = Map(),  // static markup from define_command
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    val execs: Map[Exec_ID, Command.State] = Map(),  // dynamic markup from execution
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    val assignments: Map[Version_ID, State.Assignment] = Map(),
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    val disposed: Set[ID] = Set(),  // FIXME unused!?
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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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      if (versions.isDefinedAt(id) || disposed(id)) fail
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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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      if (commands.isDefinedAt(id) || disposed(id)) fail
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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.accumulate(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.accumulate(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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              }
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            (commands2, execs2)
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        }
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      val new_assignment = the_assignment(version).assign(command_execs, last_execs)
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      val new_state = copy(assignments = assignments + (id -> new_assignment), execs = new_execs)
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      (changed_commands, new_state)
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    }
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    def is_assigned(version: Version): Boolean =
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      assignments.get(version.id) match {
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        case Some(assgn) => assgn.is_finished
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        case None => false
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      }
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    def is_stable(change: Change): Boolean =
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      change.is_finished && is_assigned(change.version.get_finished)
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    def recent_stable: Change = history.undo_list.find(is_stable) getOrElse fail
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    def tip_stable: Boolean = is_stable(history.tip)
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    def tip_version: Version = history.tip.version.get_finished
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    def last_exec_offset(name: Node.Name): Text.Offset =
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    {
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      val version = tip_version
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      the_assignment(version).last_execs.get(name.node) match {
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        case Some(Some(id)) =>
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          val node = version.nodes(name)
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          val cmd = the_command(id).command
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          node.command_start(cmd) match {
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            case None => 0
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            case Some(start) => start + cmd.length
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          }
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        case _ => 0
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   365
      }
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   366
    }
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   367
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   368
    def continue_history(
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   369
        previous: Future[Version],
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        edits: List[Edit_Text],
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        version: Future[Version]): (Change, State) =
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    {
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      val change = Change(Some(previous), edits, version)
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      (change, copy(history = history + change))
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    }
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   376
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    def prune_history(retain: Int = 0): (List[Version], State) =
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    {
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      val undo_list = history.undo_list
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      val n = undo_list.iterator.zipWithIndex.find(p => is_stable(p._1)).get._2 + 1
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      val (retained, dropped) = undo_list.splitAt(n max retain)
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   382
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      retained.splitAt(retained.length - 1) match {
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        case (prefix, List(last)) =>
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          val dropped_versions = dropped.map(change => change.version.get_finished)
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          val state1 = copy(history = History(prefix ::: List(last.truncate)))
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          (dropped_versions, state1)
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   388
        case _ => fail
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      }
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   390
    }
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   391
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    def command_state(version: Version, command: Command): Command.State =
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    {
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      require(is_assigned(version))
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      try {
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        the_exec(the_assignment(version).check_finished.command_execs
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   397
          .getOrElse(command.id, fail))
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   398
      }
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   399
      catch { case _: State.Fail => command.empty_state }
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   400
    }
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   401
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   402
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   403
    // persistent user-view
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    def snapshot(name: Node.Name, pending_edits: List[Text.Edit]): Snapshot =
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   405
    {
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   406
      val stable = recent_stable
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   407
      val latest = history.tip
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   408
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      // FIXME proper treatment of removed nodes
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      val edits =
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        (pending_edits /: history.undo_list.takeWhile(_ != stable))((edits, change) =>
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            (for ((a, Node.Edits(es)) <- change.edits if a == name) yield es).flatten ::: edits)
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      lazy val reverse_edits = edits.reverse
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   414
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      new Snapshot
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      {
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        val state = State.this
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        val version = stable.version.get_finished
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        val node = version.nodes(name)
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        val is_outdated = !(pending_edits.isEmpty && latest == stable)
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   421
        def command_state(command: Command): Command.State = state.command_state(version, command)
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   422
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        def convert(offset: Text.Offset) = (offset /: edits)((i, edit) => edit.convert(i))
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        def revert(offset: Text.Offset) = (offset /: reverse_edits)((i, edit) => edit.revert(i))
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   425
        def convert(range: Text.Range) = (range /: edits)((r, edit) => edit.convert(r))
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   426
        def revert(range: Text.Range) = (range /: reverse_edits)((r, edit) => edit.revert(r))
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   427
wenzelm@39178
   428
        def select_markup[A](range: Text.Range)(result: Markup_Tree.Select[A])
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   429
          : Stream[Text.Info[Option[A]]] =
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   430
        {
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   431
          val former_range = revert(range)
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   432
          for {
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   433
            (command, command_start) <- node.command_range(former_range).toStream
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   434
            Text.Info(r0, x) <- command_state(command).markup.
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   435
              select((former_range - command_start).restrict(command.range)) {
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   436
                case Text.Info(r0, info)
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   437
                if result.isDefinedAt(Text.Info(convert(r0 + command_start), info)) =>
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   438
                  result(Text.Info(convert(r0 + command_start), info))
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   439
              }
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   440
          } yield Text.Info(convert(r0 + command_start), x)
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   441
        }
wenzelm@38841
   442
      }
wenzelm@38150
   443
    }
wenzelm@34485
   444
  }
wenzelm@34840
   445
}
wenzelm@34840
   446