src/Pure/Thy/thy_syntax.scala
author wenzelm
Fri Mar 13 12:58:49 2015 +0100 (2015-03-13)
changeset 59689 7968c57ea240
parent 59684 86a76300137e
child 59695 a03e0561bdbf
permissions -rw-r--r--
simplified Command.resolve_files in ML, using blobs_index from Scala;
clarified modules;
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/*  Title:      Pure/Thy/thy_syntax.scala
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    Author:     Makarius
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Superficial theory syntax: tokens and spans.
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*/
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package isabelle
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import scala.collection.mutable
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import scala.annotation.tailrec
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object Thy_Syntax
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{
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  /** perspective **/
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  def command_perspective(
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      node: Document.Node,
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      perspective: Text.Perspective,
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      overlays: Document.Node.Overlays): (Command.Perspective, Command.Perspective) =
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  {
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    if (perspective.is_empty && overlays.is_empty)
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      (Command.Perspective.empty, Command.Perspective.empty)
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    else {
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      val has_overlay = overlays.commands
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      val visible = new mutable.ListBuffer[Command]
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      val visible_overlay = new mutable.ListBuffer[Command]
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      @tailrec
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      def check_ranges(ranges: List[Text.Range], commands: Stream[(Command, Text.Offset)])
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      {
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        (ranges, commands) match {
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          case (range :: more_ranges, (command, offset) #:: more_commands) =>
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            val command_range = command.range + offset
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            range compare command_range match {
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              case 0 =>
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                visible += command
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                visible_overlay += command
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                check_ranges(ranges, more_commands)
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              case c =>
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                if (has_overlay(command)) visible_overlay += command
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                if (c < 0) check_ranges(more_ranges, commands)
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                else check_ranges(ranges, more_commands)
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            }
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          case (Nil, (command, _) #:: more_commands) =>
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            if (has_overlay(command)) visible_overlay += command
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            check_ranges(Nil, more_commands)
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          case _ =>
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        }
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      }
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      val commands =
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        (if (overlays.is_empty) node.command_iterator(perspective.range)
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         else node.command_iterator()).toStream
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      check_ranges(perspective.ranges, commands)
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      (Command.Perspective(visible.toList), Command.Perspective(visible_overlay.toList))
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    }
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  }
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  /** header edits: structure and outer syntax **/
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  private def header_edits(
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    resources: Resources,
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    previous: Document.Version,
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    edits: List[Document.Edit_Text]):
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    (List[Document.Node.Name], Document.Nodes, List[Document.Edit_Command]) =
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  {
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    val syntax_changed0 = new mutable.ListBuffer[Document.Node.Name]
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    var nodes = previous.nodes
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    val doc_edits = new mutable.ListBuffer[Document.Edit_Command]
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    edits foreach {
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      case (name, Document.Node.Deps(header)) =>
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        val node = nodes(name)
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        val update_header =
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          node.header.errors.nonEmpty || header.errors.nonEmpty || node.header != header
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        if (update_header) {
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          val node1 = node.update_header(header)
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          if (node.header.imports != node1.header.imports ||
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              node.header.keywords != node1.header.keywords) syntax_changed0 += name
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          nodes += (name -> node1)
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          doc_edits += (name -> Document.Node.Deps(header))
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        }
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      case _ =>
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    }
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    val syntax_changed = nodes.descendants(syntax_changed0.toList)
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    for (name <- syntax_changed) {
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      val node = nodes(name)
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      val syntax =
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        if (node.is_empty) None
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        else {
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          val header = node.header
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          val imports_syntax = header.imports.flatMap(a => nodes(a).syntax)
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          Some((resources.base_syntax /: imports_syntax)(_ ++ _).add_keywords(header.keywords))
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        }
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      nodes += (name -> node.update_syntax(syntax))
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    }
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    (syntax_changed, nodes, doc_edits.toList)
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  }
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  /** text edits **/
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  /* edit individual command source */
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  @tailrec def edit_text(eds: List[Text.Edit], commands: Linear_Set[Command]): Linear_Set[Command] =
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  {
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    eds match {
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      case e :: es =>
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        Document.Node.Commands.starts(commands.iterator).find {
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          case (cmd, cmd_start) =>
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            e.can_edit(cmd.source, cmd_start) ||
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              e.is_insert && e.start == cmd_start + cmd.length
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        } match {
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          case Some((cmd, cmd_start)) if e.can_edit(cmd.source, cmd_start) =>
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            val (rest, text) = e.edit(cmd.source, cmd_start)
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            val new_commands = commands.insert_after(Some(cmd), Command.unparsed(text)) - cmd
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            edit_text(rest.toList ::: es, new_commands)
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          case Some((cmd, cmd_start)) =>
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            edit_text(es, commands.insert_after(Some(cmd), Command.unparsed(e.text)))
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          case None =>
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            require(e.is_insert && e.start == 0)
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            edit_text(es, commands.insert_after(None, Command.unparsed(e.text)))
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        }
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      case Nil => commands
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    }
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  }
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  /* reparse range of command spans */
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  @tailrec private def chop_common(
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      cmds: List[Command],
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      blobs_spans: List[((List[Command.Blob], Int), Command_Span.Span)])
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    : (List[Command], List[((List[Command.Blob], Int), Command_Span.Span)]) =
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  {
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    (cmds, blobs_spans) match {
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      case (cmd :: cmds, (blobs, span) :: rest) if cmd.blobs == blobs && cmd.span == span =>
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        chop_common(cmds, rest)
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      case _ => (cmds, blobs_spans)
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    }
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  }
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  private def reparse_spans(
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    resources: Resources,
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    syntax: Prover.Syntax,
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    get_blob: Document.Node.Name => Option[Document.Blob],
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    name: Document.Node.Name,
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    commands: Linear_Set[Command],
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    first: Command, last: Command): Linear_Set[Command] =
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  {
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    val cmds0 = commands.iterator(first, last).toList
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    val blobs_spans0 =
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      syntax.parse_spans(cmds0.iterator.map(_.source).mkString).
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        map(span => (Command.resolve_files(resources, syntax, name, span, get_blob), span))
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    val (cmds1, blobs_spans1) = chop_common(cmds0, blobs_spans0)
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    val (rev_cmds2, rev_blobs_spans2) = chop_common(cmds1.reverse, blobs_spans1.reverse)
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    val cmds2 = rev_cmds2.reverse
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    val blobs_spans2 = rev_blobs_spans2.reverse
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    cmds2 match {
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      case Nil =>
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        assert(blobs_spans2.isEmpty)
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        commands
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      case cmd :: _ =>
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        val hook = commands.prev(cmd)
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        val inserted =
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          blobs_spans2.map({ case (blobs, span) =>
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            Command(Document_ID.make(), name, Some(blobs), span) })
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        (commands /: cmds2)(_ - _).append_after(hook, inserted)
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    }
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  }
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  /* recover command spans after edits */
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  // FIXME somewhat slow
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  private def recover_spans(
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    resources: Resources,
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    syntax: Prover.Syntax,
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    get_blob: Document.Node.Name => Option[Document.Blob],
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    name: Document.Node.Name,
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    perspective: Command.Perspective,
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    commands: Linear_Set[Command]): Linear_Set[Command] =
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  {
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    val visible = perspective.commands.toSet
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    def next_invisible_command(cmds: Linear_Set[Command], from: Command): Command =
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      cmds.iterator(from).dropWhile(cmd => !cmd.is_proper || visible(cmd))
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        .find(_.is_proper) getOrElse cmds.last
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    @tailrec def recover(cmds: Linear_Set[Command]): Linear_Set[Command] =
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      cmds.find(_.is_unparsed) match {
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        case Some(first_unparsed) =>
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          val first = next_invisible_command(cmds.reverse, first_unparsed)
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          val last = next_invisible_command(cmds, first_unparsed)
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          recover(reparse_spans(resources, syntax, get_blob, name, cmds, first, last))
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        case None => cmds
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      }
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    recover(commands)
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  }
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  /* consolidate unfinished spans */
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  private def consolidate_spans(
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    resources: Resources,
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    syntax: Prover.Syntax,
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    get_blob: Document.Node.Name => Option[Document.Blob],
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    reparse_limit: Int,
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    name: Document.Node.Name,
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    perspective: Command.Perspective,
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    commands: Linear_Set[Command]): Linear_Set[Command] =
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  {
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    if (perspective.commands.isEmpty) commands
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    else {
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      commands.find(_.is_unfinished) match {
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        case Some(first_unfinished) =>
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          val visible = perspective.commands.toSet
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          commands.reverse.find(visible) match {
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            case Some(last_visible) =>
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              val it = commands.iterator(last_visible)
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              var last = last_visible
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              var i = 0
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              while (i < reparse_limit && it.hasNext) {
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                last = it.next
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                i += last.length
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              }
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              reparse_spans(resources, syntax, get_blob, name, commands, first_unfinished, last)
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            case None => commands
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          }
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        case None => commands
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      }
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    }
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  }
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  /* main */
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  def diff_commands(old_cmds: Linear_Set[Command], new_cmds: Linear_Set[Command])
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    : List[Command.Edit] =
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  {
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    val removed = old_cmds.iterator.filter(!new_cmds.contains(_)).toList
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    val inserted = new_cmds.iterator.filter(!old_cmds.contains(_)).toList
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    removed.reverse.map(cmd => (old_cmds.prev(cmd), None)) :::
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    inserted.map(cmd => (new_cmds.prev(cmd), Some(cmd)))
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  }
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  private def text_edit(
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    resources: Resources,
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    syntax: Prover.Syntax,
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    get_blob: Document.Node.Name => Option[Document.Blob],
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    reparse_limit: Int,
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    node: Document.Node, edit: Document.Edit_Text): Document.Node =
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  {
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    edit match {
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      case (_, Document.Node.Clear()) => node.clear
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      case (_, Document.Node.Blob(blob)) => node.init_blob(blob)
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      case (name, Document.Node.Edits(text_edits)) =>
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        if (name.is_theory) {
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          val commands0 = node.commands
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          val commands1 = edit_text(text_edits, commands0)
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          val commands2 =
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            recover_spans(resources, syntax, get_blob, name, node.perspective.visible, commands1)
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          node.update_commands(commands2)
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        }
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        else node
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      case (_, Document.Node.Deps(_)) => node
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      case (name, Document.Node.Perspective(required, text_perspective, overlays)) =>
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        val (visible, visible_overlay) = command_perspective(node, text_perspective, overlays)
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        val perspective: Document.Node.Perspective_Command =
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          Document.Node.Perspective(required, visible_overlay, overlays)
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        if (node.same_perspective(text_perspective, perspective)) node
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        else
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          node.update_perspective(text_perspective, perspective).
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            update_commands(
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              consolidate_spans(resources, syntax, get_blob, reparse_limit,
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                name, visible, node.commands))
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    }
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  }
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  def parse_change(
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      resources: Resources,
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      reparse_limit: Int,
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      previous: Document.Version,
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      doc_blobs: Document.Blobs,
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      edits: List[Document.Edit_Text]): Session.Change =
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  {
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    def get_blob(name: Document.Node.Name) =
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      doc_blobs.get(name) orElse previous.nodes(name).get_blob
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    val (syntax_changed, nodes0, doc_edits0) = header_edits(resources, previous, edits)
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    val (doc_edits, version) =
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      if (edits.isEmpty) (Nil, Document.Version.make(previous.nodes))
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      else {
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        val reparse =
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          (syntax_changed /: nodes0.iterator)({
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            case (reparse, (name, node)) =>
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              if (node.load_commands.exists(_.blobs_changed(doc_blobs)))
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                name :: reparse
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              else reparse
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            })
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        val reparse_set = reparse.toSet
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        var nodes = nodes0
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        val doc_edits = new mutable.ListBuffer[Document.Edit_Command]; doc_edits ++= doc_edits0
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        val node_edits =
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          (edits ::: reparse.map((_, Document.Node.Edits(Nil)))).groupBy(_._1)
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            .asInstanceOf[Map[Document.Node.Name, List[Document.Edit_Text]]]  // FIXME ???
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        node_edits foreach {
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          case (name, edits) =>
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            val node = nodes(name)
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            val syntax = node.syntax getOrElse resources.base_syntax
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            val commands = node.commands
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            val node1 =
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              if (reparse_set(name) && commands.nonEmpty)
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                node.update_commands(
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                  reparse_spans(resources, syntax, get_blob,
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                    name, commands, commands.head, commands.last))
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              else node
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            val node2 =
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              (node1 /: edits)(text_edit(resources, syntax, get_blob, reparse_limit, _, _))
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            val node3 =
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              if (reparse_set.contains(name))
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                text_edit(resources, syntax, get_blob, reparse_limit,
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                  node2, (name, node2.edit_perspective))
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   350
              else node2
wenzelm@54521
   351
wenzelm@59372
   352
            if (!(node.same_perspective(node3.text_perspective, node3.perspective)))
wenzelm@59372
   353
              doc_edits += (name -> node3.perspective)
wenzelm@54521
   354
wenzelm@59372
   355
            doc_edits += (name -> Document.Node.Edits(diff_commands(commands, node3.commands)))
wenzelm@59372
   356
wenzelm@59372
   357
            nodes += (name -> node3)
wenzelm@56316
   358
        }
wenzelm@59077
   359
        (doc_edits.toList.filterNot(_._2.is_void), Document.Version.make(nodes))
wenzelm@54513
   360
      }
wenzelm@54513
   361
wenzelm@59319
   362
    Session.Change(previous, syntax_changed, syntax_changed.nonEmpty, doc_edits, version)
wenzelm@38374
   363
  }
wenzelm@34268
   364
}