src/Pure/PIDE/document.scala
author wenzelm
Mon Mar 31 15:28:14 2014 +0200 (2014-03-31)
changeset 56336 60434514ec0a
parent 56335 8953d4cc060a
child 56337 520148f9921d
permissions -rw-r--r--
tuned signature -- more static typing;
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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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  /** document structure **/
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  /* overlays -- print functions with arguments */
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  object Overlays
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  {
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    val empty = new Overlays(Map.empty)
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  }
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  final class Overlays private(rep: Map[Node.Name, Node.Overlays])
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  {
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    def apply(name: Document.Node.Name): Node.Overlays =
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      rep.getOrElse(name, Node.Overlays.empty)
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    private def update(name: Node.Name, f: Node.Overlays => Node.Overlays): Overlays =
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    {
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      val node_overlays = f(apply(name))
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      new Overlays(if (node_overlays.is_empty) rep - name else rep + (name -> node_overlays))
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    }
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    def insert(command: Command, fn: String, args: List[String]): Overlays =
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      update(command.node_name, _.insert(command, fn, args))
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    def remove(command: Command, fn: String, args: List[String]): Overlays =
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      update(command.node_name, _.remove(command, fn, args))
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    override def toString: String = rep.mkString("Overlays(", ",", ")")
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  }
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  /* document blobs: auxiliary files */
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  sealed case class Blob(bytes: Bytes, file: Command.File, changed: Boolean)
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  {
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    def unchanged: Blob = copy(changed = false)
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  }
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  object Blobs
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  {
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    def apply(blobs: Map[Node.Name, Blob]): Blobs = new Blobs(blobs)
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    val empty: Blobs = apply(Map.empty)
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  }
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  final class Blobs private(blobs: Map[Node.Name, Blob])
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  {
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    private lazy val digests: Map[SHA1.Digest, Blob] =
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      for ((_, blob) <- blobs) yield (blob.bytes.sha1_digest, blob)
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    def get(digest: SHA1.Digest): Option[Blob] = digests.get(digest)
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    def get(name: Node.Name): Option[Blob] = blobs.get(name)
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    def changed(name: Node.Name): Boolean =
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      get(name) match {
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        case Some(blob) => blob.changed
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        case None => false
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      }
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    override def toString: String = blobs.mkString("Blobs(", ",", ")")
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  }
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  /* document nodes: theories and auxiliary files */
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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[Command.Edit, Command.Perspective]
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  object Node
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  {
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    val empty: Node = new Node()
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    /* header and name */
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    sealed case class Header(
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      imports: List[Name],
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      keywords: Thy_Header.Keywords,
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      errors: List[String] = Nil)
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    {
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      def error(msg: String): Header = copy(errors = errors ::: List(msg))
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      def cat_errors(msg2: String): Header =
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        copy(errors = errors.map(msg1 => Library.cat_message(msg1, msg2)))
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    }
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    def bad_header(msg: String): Header = Header(Nil, Nil, List(msg))
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    val no_header = bad_header("No theory header")
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    object Name
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    {
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      val empty = Name("")
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      object Ordering extends scala.math.Ordering[Name]
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      {
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        def compare(name1: Name, name2: Name): Int = name1.node compare name2.node
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      }
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    }
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    sealed case class Name(node: String, master_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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      def is_theory: Boolean = !theory.isEmpty
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      override def toString: String = if (is_theory) theory else node
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    }
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    /* node overlays */
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    object Overlays
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    {
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      val empty = new Overlays(Multi_Map.empty)
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    }
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    final class Overlays private(rep: Multi_Map[Command, (String, List[String])])
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    {
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      def commands: Set[Command] = rep.keySet
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      def is_empty: Boolean = rep.isEmpty
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      def dest: List[(Command, (String, List[String]))] = rep.iterator.toList
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      def insert(cmd: Command, fn: String, args: List[String]): Overlays =
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        new Overlays(rep.insert(cmd, (fn, args)))
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      def remove(cmd: Command, fn: String, args: List[String]): Overlays =
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        new Overlays(rep.remove(cmd, (fn, args)))
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      override def toString: String = rep.mkString("Node.Overlays(", ",", ")")
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    }
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    /* edits */
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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 Blob[A, B](blob: Document.Blob) 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 Deps[A, B](header: Header) extends Edit[A, B]
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    case class Perspective[A, B](required: Boolean, visible: B, overlays: Overlays) extends Edit[A, B]
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    type Perspective_Text = Perspective[Text.Edit, Text.Perspective]
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    type Perspective_Command = Perspective[Command.Edit, Command.Perspective]
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    /* commands */
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    object Commands
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    {
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      def apply(commands: Linear_Set[Command]): Commands = new Commands(commands)
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      val empty: Commands = apply(Linear_Set.empty)
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      def 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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      private val block_size = 1024
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    }
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    final class Commands private(val commands: Linear_Set[Command])
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    {
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      lazy val load_commands: List[Command] =
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        commands.iterator.filter(cmd => !cmd.blobs.isEmpty).toList
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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) <- Commands.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 += Commands.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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      private def full_range: Text.Range = full_index._2
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      def 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 / Commands.block_size)
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          Node.Commands.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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    }
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  }
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  final class Node private(
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    val get_blob: Option[Document.Blob] = None,
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    val header: Node.Header = Node.bad_header("Bad theory header"),
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    val perspective: Node.Perspective_Command =
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      Node.Perspective(false, Command.Perspective.empty, Node.Overlays.empty),
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    _commands: Node.Commands = Node.Commands.empty)
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  {
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    def clear: Node = new Node(header = header)
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    def init_blob(blob: Document.Blob): Node = new Node(Some(blob.unchanged))
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    def update_header(new_header: Node.Header): Node =
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      new Node(get_blob, new_header, perspective, _commands)
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    def update_perspective(new_perspective: Node.Perspective_Command): Node =
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      new Node(get_blob, header, new_perspective, _commands)
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    def same_perspective(other_perspective: Node.Perspective_Command): Boolean =
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      perspective.required == other_perspective.required &&
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      perspective.visible.same(other_perspective.visible) &&
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      perspective.overlays == other_perspective.overlays
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    def commands: Linear_Set[Command] = _commands.commands
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    def load_commands: List[Command] = _commands.load_commands
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    def update_commands(new_commands: Linear_Set[Command]): Node =
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      if (new_commands eq _commands.commands) this
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      else new Node(get_blob, header, perspective, Node.Commands(new_commands))
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    def command_range(i: Text.Offset = 0): Iterator[(Command, Text.Offset)] =
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      _commands.range(i)
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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_start(cmd: Command): Option[Text.Offset] =
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      Node.Commands.starts(commands.iterator).find(_._1 == cmd).map(_._2)
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  }
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  /* development graph */
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  object Nodes
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  {
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    val empty: Nodes = new Nodes(Graph.empty(Node.Name.Ordering))
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  }
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  final class Nodes private(graph: Graph[Node.Name, Node])
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  {
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    def get_name(s: String): Option[Node.Name] =
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      graph.keys.find(name => name.node == s)
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    def apply(name: Node.Name): Node =
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      graph.default_node(name, Node.empty).get_node(name)
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    def + (entry: (Node.Name, Node)): Nodes =
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    {
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      val (name, node) = entry
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      val imports = node.header.imports
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      val graph1 =
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        (graph.default_node(name, Node.empty) /: imports)((g, p) => g.default_node(p, Node.empty))
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      val graph2 = (graph1 /: graph1.imm_preds(name))((g, dep) => g.del_edge(dep, name))
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      val graph3 = (graph2 /: imports)((g, dep) => g.add_edge(dep, name))
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      new Nodes(graph3.map_node(name, _ => node))
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    }
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    def entries: Iterator[(Node.Name, Node)] =
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      graph.entries.map({ case (name, (node, _)) => (name, node) })
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    def load_commands(file_name: Node.Name): List[Command] =
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      (for {
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        (_, node) <- entries
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        cmd <- node.load_commands.iterator
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        name <- cmd.blobs_names.iterator
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        if name == file_name
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      } yield cmd).toList
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    def descendants(names: List[Node.Name]): List[Node.Name] = graph.all_succs(names)
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    def topological_order: List[Node.Name] = graph.topological_order
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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 = new Version()
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    def make(syntax: Outer_Syntax, nodes: Nodes): Version =
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      new Version(Document_ID.make(), syntax, nodes)
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  }
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  final class Version private(
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    val id: Document_ID.Version = Document_ID.none,
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    val syntax: Outer_Syntax = Outer_Syntax.empty,
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    val nodes: Nodes = Nodes.empty)
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  {
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    def is_init: Boolean = id == Document_ID.none
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    override def toString: String = "Version(" + id + ")"
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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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  final 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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  final 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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   366
    def tip: Change = undo_list.head
wenzelm@46679
   367
    def + (change: Change): History = new History(change :: undo_list)
wenzelm@38841
   368
wenzelm@46679
   369
    def prune(check: Change => Boolean, retain: Int): Option[(List[Change], History)] =
wenzelm@46679
   370
    {
wenzelm@46679
   371
      val n = undo_list.iterator.zipWithIndex.find(p => check(p._1)).get._2 + 1
wenzelm@46679
   372
      val (retained, dropped) = undo_list.splitAt(n max retain)
wenzelm@46679
   373
wenzelm@46679
   374
      retained.splitAt(retained.length - 1) match {
wenzelm@46679
   375
        case (prefix, List(last)) => Some(dropped, new History(prefix ::: List(last.truncate)))
wenzelm@46679
   376
        case _ => None
wenzelm@46679
   377
      }
wenzelm@46679
   378
    }
wenzelm@38841
   379
  }
wenzelm@38841
   380
wenzelm@38841
   381
wenzelm@55820
   382
  /* markup elements */
wenzelm@38841
   383
wenzelm@55820
   384
  object Elements
wenzelm@55820
   385
  {
wenzelm@55820
   386
    def apply(elems: Set[String]): Elements = new Elements(elems)
wenzelm@55820
   387
    def apply(elems: String*): Elements = apply(Set(elems: _*))
wenzelm@55820
   388
    val empty: Elements = apply()
wenzelm@55820
   389
    val full: Elements = new Full_Elements
wenzelm@55820
   390
  }
wenzelm@55820
   391
wenzelm@55820
   392
  sealed class Elements private[Document](private val rep: Set[String])
wenzelm@55820
   393
  {
wenzelm@55820
   394
    def apply(elem: String): Boolean = rep.contains(elem)
wenzelm@55820
   395
    def + (elem: String): Elements = new Elements(rep + elem)
wenzelm@55820
   396
    def ++ (elems: Elements): Elements = new Elements(rep ++ elems.rep)
wenzelm@55820
   397
    override def toString: String = rep.mkString("Elements(", ",", ")")
wenzelm@55820
   398
  }
wenzelm@55820
   399
wenzelm@55820
   400
  private class Full_Elements extends Elements(Set.empty)
wenzelm@55820
   401
  {
wenzelm@55820
   402
    override def apply(elem: String): Boolean = true
wenzelm@55820
   403
    override def toString: String = "Full_Elements()"
wenzelm@55820
   404
  }
wenzelm@55820
   405
wenzelm@55820
   406
wenzelm@55820
   407
  /* snapshot */
wenzelm@38424
   408
wenzelm@52972
   409
  object Snapshot
wenzelm@52972
   410
  {
wenzelm@52972
   411
    val init = State.init.snapshot()
wenzelm@52972
   412
  }
wenzelm@52972
   413
wenzelm@38424
   414
  abstract class Snapshot
wenzelm@38424
   415
  {
wenzelm@44582
   416
    val state: State
wenzelm@38424
   417
    val version: Version
wenzelm@38424
   418
    val is_outdated: Boolean
wenzelm@55649
   419
wenzelm@38427
   420
    def convert(i: Text.Offset): Text.Offset
wenzelm@52889
   421
    def revert(i: Text.Offset): Text.Offset
wenzelm@39177
   422
    def convert(range: Text.Range): Text.Range
wenzelm@39177
   423
    def revert(range: Text.Range): Text.Range
wenzelm@52972
   424
wenzelm@52972
   425
    val node_name: Node.Name
wenzelm@52972
   426
    val node: Node
wenzelm@56314
   427
    val load_commands: List[Command]
wenzelm@56176
   428
    def is_loaded: Boolean
wenzelm@51494
   429
    def eq_content(other: Snapshot): Boolean
wenzelm@55649
   430
wenzelm@55651
   431
    def cumulate[A](
wenzelm@55649
   432
      range: Text.Range,
wenzelm@55649
   433
      info: A,
wenzelm@55820
   434
      elements: Elements,
wenzelm@56298
   435
      result: Command.Results => (A, Text.Markup) => Option[A],
wenzelm@55651
   436
      status: Boolean = false): List[Text.Info[A]]
wenzelm@55651
   437
wenzelm@55651
   438
    def select[A](
wenzelm@55649
   439
      range: Text.Range,
wenzelm@55820
   440
      elements: Elements,
wenzelm@56298
   441
      result: Command.Results => Text.Markup => Option[A],
wenzelm@55651
   442
      status: Boolean = false): List[Text.Info[A]]
wenzelm@38424
   443
  }
wenzelm@38424
   444
wenzelm@55820
   445
wenzelm@55820
   446
wenzelm@55820
   447
  /** global state -- document structure, execution process, editing history **/
wenzelm@55820
   448
wenzelm@52563
   449
  type Assign_Update =
wenzelm@52563
   450
    List[(Document_ID.Command, List[Document_ID.Exec])]  // update of exec state assignment
wenzelm@44476
   451
wenzelm@38370
   452
  object State
wenzelm@38370
   453
  {
wenzelm@38373
   454
    class Fail(state: State) extends Exception
wenzelm@38373
   455
wenzelm@44479
   456
    object Assignment
wenzelm@44479
   457
    {
wenzelm@46683
   458
      val init: Assignment = new Assignment()
wenzelm@44479
   459
    }
wenzelm@38370
   460
wenzelm@46712
   461
    final class Assignment private(
wenzelm@52530
   462
      val command_execs: Map[Document_ID.Command, List[Document_ID.Exec]] = Map.empty,
wenzelm@46677
   463
      val is_finished: Boolean = false)
wenzelm@38370
   464
    {
wenzelm@44477
   465
      def check_finished: Assignment = { require(is_finished); this }
wenzelm@47388
   466
      def unfinished: Assignment = new Assignment(command_execs, false)
wenzelm@44479
   467
wenzelm@52563
   468
      def assign(update: Assign_Update): Assignment =
wenzelm@38370
   469
      {
wenzelm@38976
   470
        require(!is_finished)
wenzelm@44479
   471
        val command_execs1 =
wenzelm@52563
   472
          (command_execs /: update) {
wenzelm@52563
   473
            case (res, (command_id, exec_ids)) =>
wenzelm@52563
   474
              if (exec_ids.isEmpty) res - command_id
wenzelm@52563
   475
              else res + (command_id -> exec_ids)
wenzelm@44479
   476
          }
wenzelm@47388
   477
        new Assignment(command_execs1, true)
wenzelm@38150
   478
      }
wenzelm@38370
   479
    }
wenzelm@46682
   480
wenzelm@46682
   481
    val init: State =
wenzelm@52563
   482
      State().define_version(Version.init, Assignment.init).assign(Version.init.id, Nil)._2
wenzelm@38370
   483
  }
wenzelm@38370
   484
wenzelm@46712
   485
  final case class State private(
wenzelm@52530
   486
    val versions: Map[Document_ID.Version, Version] = Map.empty,
wenzelm@54519
   487
    val blobs: Set[SHA1.Digest] = Set.empty,   // inlined files
wenzelm@52530
   488
    val commands: Map[Document_ID.Command, Command.State] = Map.empty,  // static markup from define_command
wenzelm@52530
   489
    val execs: Map[Document_ID.Exec, Command.State] = Map.empty,  // dynamic markup from execution
wenzelm@52530
   490
    val assignments: Map[Document_ID.Version, State.Assignment] = Map.empty,
wenzelm@38841
   491
    val history: History = History.init)
wenzelm@38370
   492
  {
wenzelm@38373
   493
    private def fail[A]: A = throw new State.Fail(this)
wenzelm@38370
   494
wenzelm@44479
   495
    def define_version(version: Version, assignment: State.Assignment): State =
wenzelm@38370
   496
    {
wenzelm@38417
   497
      val id = version.id
wenzelm@38417
   498
      copy(versions = versions + (id -> version),
wenzelm@44479
   499
        assignments = assignments + (id -> assignment.unfinished))
wenzelm@38370
   500
    }
wenzelm@38370
   501
wenzelm@54519
   502
    def define_blob(digest: SHA1.Digest): State = copy(blobs = blobs + digest)
wenzelm@54519
   503
    def defined_blob(digest: SHA1.Digest): Boolean = blobs.contains(digest)
wenzelm@54519
   504
wenzelm@38373
   505
    def define_command(command: Command): State =
wenzelm@38373
   506
    {
wenzelm@38373
   507
      val id = command.id
wenzelm@49414
   508
      copy(commands = commands + (id -> command.init_state))
wenzelm@38373
   509
    }
wenzelm@38373
   510
wenzelm@52530
   511
    def defined_command(id: Document_ID.Command): Boolean = commands.isDefinedAt(id)
wenzelm@44582
   512
wenzelm@52531
   513
    def find_command(version: Version, id: Document_ID.Generic): Option[(Node, Command)] =
wenzelm@44582
   514
      commands.get(id) orElse execs.get(id) match {
wenzelm@44582
   515
        case None => None
wenzelm@44582
   516
        case Some(st) =>
wenzelm@44582
   517
          val command = st.command
wenzelm@46681
   518
          val node = version.nodes(command.node_name)
wenzelm@54328
   519
          if (node.commands.contains(command)) Some((node, command)) else None
wenzelm@44582
   520
      }
wenzelm@38373
   521
wenzelm@52530
   522
    def the_version(id: Document_ID.Version): Version = versions.getOrElse(id, fail)
wenzelm@52564
   523
    def the_static_state(id: Document_ID.Command): Command.State = commands.getOrElse(id, fail)
wenzelm@52564
   524
    def the_dynamic_state(id: Document_ID.Exec): Command.State = execs.getOrElse(id, fail)
wenzelm@52563
   525
    def the_assignment(version: Version): State.Assignment = assignments.getOrElse(version.id, fail)
wenzelm@38370
   526
wenzelm@56295
   527
    def valid_id(st: Command.State)(id: Document_ID.Generic): Boolean =
wenzelm@56295
   528
      id == st.command.id ||
wenzelm@56295
   529
      (execs.get(id) match { case Some(st1) => st1.command.id == st.command.id case None => false })
wenzelm@56295
   530
wenzelm@52531
   531
    def accumulate(id: Document_ID.Generic, message: XML.Elem): (Command.State, State) =
wenzelm@38370
   532
      execs.get(id) match {
wenzelm@44446
   533
        case Some(st) =>
wenzelm@56295
   534
          val new_st = st + (valid_id(st), message)
wenzelm@44446
   535
          (new_st, copy(execs = execs + (id -> new_st)))
wenzelm@38370
   536
        case None =>
wenzelm@38370
   537
          commands.get(id) match {
wenzelm@38370
   538
            case Some(st) =>
wenzelm@56295
   539
              val new_st = st + (valid_id(st), message)
wenzelm@38370
   540
              (new_st, copy(commands = commands + (id -> new_st)))
wenzelm@38370
   541
            case None => fail
wenzelm@38370
   542
          }
wenzelm@38370
   543
      }
wenzelm@38370
   544
wenzelm@52563
   545
    def assign(id: Document_ID.Version, update: Assign_Update): (List[Command], State) =
wenzelm@38370
   546
    {
wenzelm@38417
   547
      val version = the_version(id)
wenzelm@38370
   548
wenzelm@52566
   549
      def upd(exec_id: Document_ID.Exec, st: Command.State)
wenzelm@52566
   550
          : Option[(Document_ID.Exec, Command.State)] =
wenzelm@52566
   551
        if (execs.isDefinedAt(exec_id)) None else Some(exec_id -> st)
wenzelm@52566
   552
wenzelm@44543
   553
      val (changed_commands, new_execs) =
wenzelm@52563
   554
        ((Nil: List[Command], execs) /: update) {
wenzelm@52566
   555
          case ((commands1, execs1), (command_id, exec)) =>
wenzelm@52566
   556
            val st = the_static_state(command_id)
wenzelm@52566
   557
            val command = st.command
wenzelm@52527
   558
            val commands2 = command :: commands1
wenzelm@44543
   559
            val execs2 =
wenzelm@44543
   560
              exec match {
wenzelm@52527
   561
                case Nil => execs1
wenzelm@52527
   562
                case eval_id :: print_ids =>
wenzelm@52566
   563
                  execs1 ++ upd(eval_id, st) ++
wenzelm@52566
   564
                    (for (id <- print_ids; up <- upd(id, command.empty_state)) yield up)
wenzelm@44543
   565
              }
wenzelm@44543
   566
            (commands2, execs2)
wenzelm@38370
   567
        }
wenzelm@52563
   568
      val new_assignment = the_assignment(version).assign(update)
wenzelm@43722
   569
      val new_state = copy(assignments = assignments + (id -> new_assignment), execs = new_execs)
wenzelm@44476
   570
wenzelm@44543
   571
      (changed_commands, new_state)
wenzelm@38370
   572
    }
wenzelm@38370
   573
wenzelm@38417
   574
    def is_assigned(version: Version): Boolean =
wenzelm@43722
   575
      assignments.get(version.id) match {
wenzelm@38370
   576
        case Some(assgn) => assgn.is_finished
wenzelm@38370
   577
        case None => false
wenzelm@38370
   578
      }
wenzelm@38370
   579
wenzelm@44436
   580
    def is_stable(change: Change): Boolean =
wenzelm@44436
   581
      change.is_finished && is_assigned(change.version.get_finished)
wenzelm@44436
   582
wenzelm@46944
   583
    def recent_finished: Change = history.undo_list.find(_.is_finished) getOrElse fail
wenzelm@44672
   584
    def recent_stable: Change = history.undo_list.find(is_stable) getOrElse fail
wenzelm@44436
   585
    def tip_stable: Boolean = is_stable(history.tip)
wenzelm@44475
   586
    def tip_version: Version = history.tip.version.get_finished
wenzelm@44436
   587
wenzelm@44446
   588
    def continue_history(
wenzelm@44446
   589
        previous: Future[Version],
wenzelm@40479
   590
        edits: List[Edit_Text],
wenzelm@43722
   591
        version: Future[Version]): (Change, State) =
wenzelm@38841
   592
    {
wenzelm@46678
   593
      val change = Change.make(previous, edits, version)
wenzelm@38841
   594
      (change, copy(history = history + change))
wenzelm@38841
   595
    }
wenzelm@38841
   596
wenzelm@44672
   597
    def prune_history(retain: Int = 0): (List[Version], State) =
wenzelm@44672
   598
    {
wenzelm@46679
   599
      history.prune(is_stable, retain) match {
wenzelm@46679
   600
        case Some((dropped, history1)) =>
wenzelm@44672
   601
          val dropped_versions = dropped.map(change => change.version.get_finished)
wenzelm@46679
   602
          val state1 = copy(history = history1)
wenzelm@44672
   603
          (dropped_versions, state1)
wenzelm@46679
   604
        case None => fail
wenzelm@44672
   605
      }
wenzelm@44672
   606
    }
wenzelm@44672
   607
wenzelm@52530
   608
    def removed_versions(removed: List[Document_ID.Version]): State =
wenzelm@44676
   609
    {
wenzelm@44676
   610
      val versions1 = versions -- removed
wenzelm@44676
   611
      val assignments1 = assignments -- removed
wenzelm@54519
   612
      var blobs1 = Set.empty[SHA1.Digest]
wenzelm@52530
   613
      var commands1 = Map.empty[Document_ID.Command, Command.State]
wenzelm@52530
   614
      var execs1 = Map.empty[Document_ID.Exec, Command.State]
wenzelm@44676
   615
      for {
wenzelm@44676
   616
        (version_id, version) <- versions1.iterator
wenzelm@46997
   617
        command_execs = assignments1(version_id).command_execs
wenzelm@46723
   618
        (_, node) <- version.nodes.entries
wenzelm@44676
   619
        command <- node.commands.iterator
wenzelm@44676
   620
      } {
wenzelm@54519
   621
        for (digest <- command.blobs_digests; if !blobs1.contains(digest))
wenzelm@54519
   622
          blobs1 += digest
wenzelm@54519
   623
wenzelm@52568
   624
        if (!commands1.isDefinedAt(command.id))
wenzelm@52568
   625
          commands.get(command.id).foreach(st => commands1 += (command.id -> st))
wenzelm@54519
   626
wenzelm@52568
   627
        for (exec_id <- command_execs.getOrElse(command.id, Nil)) {
wenzelm@52527
   628
          if (!execs1.isDefinedAt(exec_id))
wenzelm@52527
   629
            execs.get(exec_id).foreach(st => execs1 += (exec_id -> st))
wenzelm@44676
   630
        }
wenzelm@44676
   631
      }
wenzelm@54519
   632
      copy(versions = versions1, blobs = blobs1, commands = commands1, execs = execs1,
wenzelm@54519
   633
        assignments = assignments1)
wenzelm@44676
   634
    }
wenzelm@44676
   635
wenzelm@56299
   636
    def command_states(version: Version, command: Command): List[Command.State] =
wenzelm@44613
   637
    {
wenzelm@44613
   638
      require(is_assigned(version))
wenzelm@44613
   639
      try {
wenzelm@52527
   640
        the_assignment(version).check_finished.command_execs.getOrElse(command.id, Nil)
wenzelm@52564
   641
          .map(the_dynamic_state(_)) match {
wenzelm@52527
   642
            case Nil => fail
wenzelm@56299
   643
            case states => states
wenzelm@52527
   644
          }
wenzelm@44613
   645
      }
wenzelm@47395
   646
      catch {
wenzelm@47395
   647
        case _: State.Fail =>
wenzelm@56299
   648
          try { List(the_static_state(command.id)) }
wenzelm@56299
   649
          catch { case _: State.Fail => List(command.init_state) }
wenzelm@47395
   650
      }
wenzelm@44613
   651
    }
wenzelm@44613
   652
wenzelm@56299
   653
    def command_results(version: Version, command: Command): Command.Results =
wenzelm@56299
   654
      Command.State.merge_results(command_states(version, command))
wenzelm@56299
   655
wenzelm@56301
   656
    def command_markup(version: Version, command: Command, index: Command.Markup_Index,
wenzelm@56301
   657
        range: Text.Range, elements: Elements): Markup_Tree =
wenzelm@56301
   658
      Command.State.merge_markup(command_states(version, command), index, range, elements)
wenzelm@56299
   659
wenzelm@56300
   660
    def markup_to_XML(version: Version, node: Node, elements: Elements): XML.Body =
wenzelm@56299
   661
      (for {
wenzelm@56299
   662
        command <- node.commands.iterator
wenzelm@56301
   663
        markup =
wenzelm@56301
   664
          command_markup(version, command, Command.Markup_Index.markup, command.range, elements)
wenzelm@56300
   665
        tree <- markup.to_XML(command.range, command.source, elements)
wenzelm@56299
   666
      } yield tree).toList
wenzelm@38841
   667
wenzelm@38841
   668
    // persistent user-view
wenzelm@49346
   669
    def snapshot(name: Node.Name = Node.Name.empty, pending_edits: List[Text.Edit] = Nil)
wenzelm@49346
   670
      : Snapshot =
wenzelm@38370
   671
    {
wenzelm@44672
   672
      val stable = recent_stable
wenzelm@44436
   673
      val latest = history.tip
wenzelm@38841
   674
wenzelm@44156
   675
      // FIXME proper treatment of removed nodes
wenzelm@38841
   676
      val edits =
wenzelm@38841
   677
        (pending_edits /: history.undo_list.takeWhile(_ != stable))((edits, change) =>
wenzelm@44156
   678
            (for ((a, Node.Edits(es)) <- change.edits if a == name) yield es).flatten ::: edits)
wenzelm@38841
   679
      lazy val reverse_edits = edits.reverse
wenzelm@38841
   680
wenzelm@38841
   681
      new Snapshot
wenzelm@38841
   682
      {
wenzelm@52972
   683
        /* global information */
wenzelm@52972
   684
wenzelm@44582
   685
        val state = State.this
wenzelm@39698
   686
        val version = stable.version.get_finished
wenzelm@38841
   687
        val is_outdated = !(pending_edits.isEmpty && latest == stable)
wenzelm@38841
   688
wenzelm@55649
   689
wenzelm@55649
   690
        /* local node content */
wenzelm@55649
   691
wenzelm@38841
   692
        def convert(offset: Text.Offset) = (offset /: edits)((i, edit) => edit.convert(i))
wenzelm@38841
   693
        def revert(offset: Text.Offset) = (offset /: reverse_edits)((i, edit) => edit.revert(i))
wenzelm@43425
   694
        def convert(range: Text.Range) = (range /: edits)((r, edit) => edit.convert(r))
wenzelm@43425
   695
        def revert(range: Text.Range) = (range /: reverse_edits)((r, edit) => edit.revert(r))
wenzelm@39177
   696
wenzelm@52972
   697
        val node_name = name
wenzelm@52972
   698
        val node = version.nodes(name)
wenzelm@52972
   699
wenzelm@56314
   700
        val load_commands: List[Command] =
wenzelm@55432
   701
          if (node_name.is_theory) Nil
wenzelm@56314
   702
          else version.nodes.load_commands(node_name)
wenzelm@55432
   703
wenzelm@56314
   704
        val is_loaded: Boolean = node_name.is_theory || !load_commands.isEmpty
wenzelm@56176
   705
wenzelm@51494
   706
        def eq_content(other: Snapshot): Boolean =
wenzelm@55434
   707
        {
wenzelm@55434
   708
          def eq_commands(commands: (Command, Command)): Boolean =
wenzelm@56299
   709
          {
wenzelm@56299
   710
            val states1 = state.command_states(version, commands._1)
wenzelm@56299
   711
            val states2 = other.state.command_states(other.version, commands._2)
wenzelm@56299
   712
            states1.length == states2.length &&
wenzelm@56299
   713
            (states1 zip states2).forall({ case (st1, st2) => st1 eq_content st2 })
wenzelm@56299
   714
          }
wenzelm@55434
   715
wenzelm@49346
   716
          !is_outdated && !other.is_outdated &&
wenzelm@55434
   717
          node.commands.size == other.node.commands.size &&
wenzelm@55434
   718
          (node.commands.iterator zip other.node.commands.iterator).forall(eq_commands) &&
wenzelm@56314
   719
          load_commands.length == other.load_commands.length &&
wenzelm@56314
   720
          (load_commands zip other.load_commands).forall(eq_commands)
wenzelm@55434
   721
        }
wenzelm@49346
   722
wenzelm@55649
   723
wenzelm@55649
   724
        /* cumulate markup */
wenzelm@55649
   725
wenzelm@55651
   726
        def cumulate[A](
wenzelm@55649
   727
          range: Text.Range,
wenzelm@55649
   728
          info: A,
wenzelm@55820
   729
          elements: Elements,
wenzelm@56298
   730
          result: Command.Results => (A, Text.Markup) => Option[A],
wenzelm@55651
   731
          status: Boolean = false): List[Text.Info[A]] =
wenzelm@45459
   732
        {
wenzelm@45467
   733
          val former_range = revert(range)
wenzelm@56309
   734
          val (file_name, command_range_iterator) =
wenzelm@56314
   735
            load_commands match {
wenzelm@56309
   736
              case command :: _ => (node_name.node, Iterator((command, 0)))
wenzelm@56309
   737
              case _ => ("", node.command_range(former_range))
wenzelm@56309
   738
            }
wenzelm@56309
   739
          val markup_index = Command.Markup_Index(status, file_name)
wenzelm@56309
   740
          (for {
wenzelm@56309
   741
            (command, command_start) <- command_range_iterator
wenzelm@56309
   742
            chunk <- command.chunks.get(file_name).iterator
wenzelm@56309
   743
            states = state.command_states(version, command)
wenzelm@56309
   744
            res = result(Command.State.merge_results(states))
wenzelm@56309
   745
            range = (former_range - command_start).restrict(chunk.range)
wenzelm@56309
   746
            markup = Command.State.merge_markup(states, markup_index, range, elements)
wenzelm@56309
   747
            Text.Info(r0, a) <- markup.cumulate[A](range, info, elements,
wenzelm@56309
   748
              {
wenzelm@56309
   749
                case (a, Text.Info(r0, b)) => res(a, Text.Info(convert(r0 + command_start), b))
wenzelm@56309
   750
              }).iterator
wenzelm@56309
   751
          } yield Text.Info(convert(r0 + command_start), a)).toList
wenzelm@45459
   752
        }
wenzelm@45459
   753
wenzelm@55651
   754
        def select[A](
wenzelm@55651
   755
          range: Text.Range,
wenzelm@55820
   756
          elements: Elements,
wenzelm@56298
   757
          result: Command.Results => Text.Markup => Option[A],
wenzelm@55651
   758
          status: Boolean = false): List[Text.Info[A]] =
wenzelm@38845
   759
        {
wenzelm@56298
   760
          def result1(results: Command.Results): (Option[A], Text.Markup) => Option[Option[A]] =
wenzelm@50500
   761
          {
wenzelm@56298
   762
            val res = result(results)
wenzelm@52889
   763
            (_: Option[A], x: Text.Markup) =>
wenzelm@52889
   764
              res(x) match {
wenzelm@52889
   765
                case None => None
wenzelm@52889
   766
                case some => Some(some)
wenzelm@52889
   767
              }
wenzelm@50500
   768
          }
wenzelm@55651
   769
          for (Text.Info(r, Some(x)) <- cumulate(range, None, elements, result1 _, status))
wenzelm@46198
   770
            yield Text.Info(r, x)
wenzelm@38845
   771
        }
wenzelm@55800
   772
wenzelm@55800
   773
wenzelm@55800
   774
        /* output */
wenzelm@55800
   775
wenzelm@55800
   776
        override def toString: String =
wenzelm@55800
   777
          "Snapshot(node = " + node_name.node + ", version = " + version.id +
wenzelm@55800
   778
            (if (is_outdated) ", outdated" else "") + ")"
wenzelm@38841
   779
      }
wenzelm@38150
   780
    }
wenzelm@34485
   781
  }
wenzelm@34840
   782
}
wenzelm@34840
   783