src/Pure/Thy/thy_syntax.scala
author wenzelm
Fri, 06 Oct 2017 17:13:57 +0200
changeset 66770 122df1fde073
parent 66721 ae38b8c0fdd9
child 66772 a66f11a0b5b1
permissions -rw-r--r--
clarified node_syntax (amending ae38b8c0fdd9): default to overall_syntax, e.g. relevant for command spans wrt. bad header;
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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: graph 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.map(_._1) != node1.header.imports.map(_._1) ||
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              node.header.keywords != node1.header.keywords ||
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              node.header.abbrevs != node1.header.abbrevs ||
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              node.header.errors != node1.header.errors) 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 =
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            Outer_Syntax.merge(
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              header.imports.map(p => resources.session_base.node_syntax(nodes, p._1)))
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          Some(imports_syntax + header)
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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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        def insert_text(cmd: Option[Command], text: String): Linear_Set[Command] =
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          if (text == "") commands else commands.insert_after(cmd, Command.text(text))
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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 = insert_text(Some(cmd), 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, insert_text(Some(cmd), 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, insert_text(None, 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[(Command.Blobs_Info, Command_Span.Span)])
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    : (List[Command], List[(Command.Blobs_Info, Command_Span.Span)]) =
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  {
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    (cmds, blobs_spans) match {
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      case (cmd :: cmds, (blobs_info, span) :: rest)
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      if cmd.blobs_info == blobs_info && cmd.span == span => 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: Outer_Syntax,
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    get_blob: Document.Node.Name => Option[Document.Blob],
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    can_import: Document.Node.Name => Boolean,
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    node_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).map(span =>
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        (Command.blobs_info(resources, syntax, get_blob, can_import, node_name, span), 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(), node_name, blobs, span) })
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        (commands /: cmds2)(_ - _).append_after(hook, inserted)
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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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63866
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    removed.map(cmd => (old_cmds.prev(cmd), None)) reverse_:::
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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: Outer_Syntax,
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    get_blob: Document.Node.Name => Option[Document.Blob],
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    can_import: Document.Node.Name => Boolean,
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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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    /* recover command spans after edits */
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    // FIXME somewhat slow
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    def recover_spans(
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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 is_visible = perspective.commands.toSet
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      def next_invisible(cmds: Linear_Set[Command], from: Command): Command =
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        cmds.iterator(from).dropWhile(cmd => !cmd.is_proper || is_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(cmds.reverse, first_unparsed)
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            val last = next_invisible(cmds, first_unparsed)
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            recover(
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              reparse_spans(resources, syntax, get_blob, can_import, 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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    edit match {
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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 = recover_spans(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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          /* consolidate unfinished spans */
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          val is_visible = visible.commands.toSet
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          val commands = node.commands
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          val commands1 =
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            if (is_visible.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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                  commands.reverse.find(is_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, can_import,
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                        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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          node.update_perspective(text_perspective, perspective).update_commands(commands1)
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        }
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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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    val (syntax_changed, nodes0, doc_edits0) = header_edits(resources, previous, edits)
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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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    def can_import(name: Document.Node.Name): Boolean =
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      resources.session_base.loaded_theory(name) || nodes0(name).has_header
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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_changed(doc_blobs) && !reparse.contains(name))
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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 = resources.session_base.node_syntax(nodes, name)
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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, can_import, name,
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                    commands, commands.head, commands.last))
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              else node
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            val node2 =
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              (node1 /: edits)(
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                text_edit(resources, syntax, get_blob, can_import, 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, can_import, reparse_limit,
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                  node2, (name, node2.edit_perspective))
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              else node2
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            if (!node.same_perspective(node3.text_perspective, node3.perspective))
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              doc_edits += (name -> node3.perspective)
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            doc_edits += (name -> Document.Node.Edits(diff_commands(commands, node3.commands)))
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            nodes += (name -> node3)
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        }
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        (doc_edits.toList.filterNot(_._2.is_void), Document.Version.make(nodes))
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      }
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    Session.Change(previous, syntax_changed, syntax_changed.nonEmpty, doc_edits, version)
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  }
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}