/* Title: Pure/PIDE/document.scala
Author: Makarius
Document as collection of named nodes, each consisting of an editable
list of commands, associated with asynchronous execution process.
*/
package isabelle
import scala.collection.mutable
object Document
{
/** document structure **/
/* overlays -- print functions with arguments */
object Overlays
{
val empty = new Overlays(Map.empty)
}
final class Overlays private(rep: Map[Node.Name, Node.Overlays])
{
def apply(name: Document.Node.Name): Node.Overlays =
rep.getOrElse(name, Node.Overlays.empty)
private def update(name: Node.Name, f: Node.Overlays => Node.Overlays): Overlays =
{
val node_overlays = f(apply(name))
new Overlays(if (node_overlays.is_empty) rep - name else rep + (name -> node_overlays))
}
def insert(command: Command, fn: String, args: List[String]): Overlays =
update(command.node_name, _.insert(command, fn, args))
def remove(command: Command, fn: String, args: List[String]): Overlays =
update(command.node_name, _.remove(command, fn, args))
override def toString: String = rep.mkString("Overlays(", ",", ")")
}
/* document blobs: auxiliary files */
sealed case class Blob(bytes: Bytes, chunk: Symbol.Text_Chunk, changed: Boolean)
{
def unchanged: Blob = copy(changed = false)
}
object Blobs
{
def apply(blobs: Map[Node.Name, Blob]): Blobs = new Blobs(blobs)
val empty: Blobs = apply(Map.empty)
}
final class Blobs private(blobs: Map[Node.Name, Blob])
{
private lazy val digests: Map[SHA1.Digest, Blob] =
for ((_, blob) <- blobs) yield (blob.bytes.sha1_digest, blob)
def get(digest: SHA1.Digest): Option[Blob] = digests.get(digest)
def get(name: Node.Name): Option[Blob] = blobs.get(name)
def changed(name: Node.Name): Boolean =
get(name) match {
case Some(blob) => blob.changed
case None => false
}
override def toString: String = blobs.mkString("Blobs(", ",", ")")
}
/* document nodes: theories and auxiliary files */
type Edit[A, B] = (Node.Name, Node.Edit[A, B])
type Edit_Text = Edit[Text.Edit, Text.Perspective]
type Edit_Command = Edit[Command.Edit, Command.Perspective]
object Node
{
/* header and name */
sealed case class Header(
imports: List[Name],
keywords: Thy_Header.Keywords,
errors: List[String])
{
def error(msg: String): Header = copy(errors = errors ::: List(msg))
def cat_errors(msg2: String): Header =
copy(errors = errors.map(msg1 => Library.cat_message(msg1, msg2)))
}
val no_header = Header(Nil, Nil, Nil)
def bad_header(msg: String): Header = Header(Nil, Nil, List(msg))
object Name
{
val empty = Name("")
object Ordering extends scala.math.Ordering[Name]
{
def compare(name1: Name, name2: Name): Int = name1.node compare name2.node
}
}
sealed case class Name(node: String, master_dir: String = "", theory: String = "")
{
override def hashCode: Int = node.hashCode
override def equals(that: Any): Boolean =
that match {
case other: Name => node == other.node
case _ => false
}
def is_theory: Boolean = !theory.isEmpty
override def toString: String = if (is_theory) theory else node
def map(f: String => String): Name = copy(f(node), f(master_dir), theory)
}
/* node overlays */
object Overlays
{
val empty = new Overlays(Multi_Map.empty)
}
final class Overlays private(rep: Multi_Map[Command, (String, List[String])])
{
def commands: Set[Command] = rep.keySet
def is_empty: Boolean = rep.isEmpty
def dest: List[(Command, (String, List[String]))] = rep.iterator.toList
def insert(cmd: Command, fn: String, args: List[String]): Overlays =
new Overlays(rep.insert(cmd, (fn, args)))
def remove(cmd: Command, fn: String, args: List[String]): Overlays =
new Overlays(rep.remove(cmd, (fn, args)))
override def toString: String = rep.mkString("Node.Overlays(", ",", ")")
}
/* edits */
sealed abstract class Edit[A, B]
{
def foreach(f: A => Unit)
{
this match {
case Edits(es) => es.foreach(f)
case _ =>
}
}
def is_void: Boolean =
this match {
case Edits(Nil) => true
case _ => false
}
}
case class Clear[A, B]() extends Edit[A, B]
case class Blob[A, B](blob: Document.Blob) extends Edit[A, B]
case class Edits[A, B](edits: List[A]) extends Edit[A, B]
case class Deps[A, B](header: Header) extends Edit[A, B]
case class Perspective[A, B](required: Boolean, visible: B, overlays: Overlays) extends Edit[A, B]
/* perspective */
type Perspective_Text = Perspective[Text.Edit, Text.Perspective]
type Perspective_Command = Perspective[Command.Edit, Command.Perspective]
val no_perspective_text: Perspective_Text =
Perspective(false, Text.Perspective.empty, Overlays.empty)
val no_perspective_command: Perspective_Command =
Perspective(false, Command.Perspective.empty, Overlays.empty)
def is_no_perspective_command(perspective: Perspective_Command): Boolean =
!perspective.required &&
perspective.visible.is_empty &&
perspective.overlays.is_empty
/* commands */
object Commands
{
def apply(commands: Linear_Set[Command]): Commands = new Commands(commands)
val empty: Commands = apply(Linear_Set.empty)
def starts(commands: Iterator[Command], offset: Text.Offset = 0)
: Iterator[(Command, Text.Offset)] =
{
var i = offset
for (command <- commands) yield {
val start = i
i += command.length
(command, start)
}
}
private val block_size = 256
}
final class Commands private(val commands: Linear_Set[Command])
{
lazy val load_commands: List[Command] =
commands.iterator.filter(cmd => !cmd.blobs.isEmpty).toList
private lazy val full_index: (Array[(Command, Text.Offset)], Text.Range) =
{
val blocks = new mutable.ListBuffer[(Command, Text.Offset)]
var next_block = 0
var last_stop = 0
for ((command, start) <- Commands.starts(commands.iterator)) {
last_stop = start + command.length
while (last_stop + 1 > next_block) {
blocks += (command -> start)
next_block += Commands.block_size
}
}
(blocks.toArray, Text.Range(0, last_stop))
}
private def full_range: Text.Range = full_index._2
def iterator(i: Text.Offset = 0): Iterator[(Command, Text.Offset)] =
{
if (!commands.isEmpty && full_range.contains(i)) {
val (cmd0, start0) = full_index._1(i / Commands.block_size)
Node.Commands.starts(commands.iterator(cmd0), start0) dropWhile {
case (cmd, start) => start + cmd.length <= i }
}
else Iterator.empty
}
}
val empty: Node = new Node()
}
final class Node private(
val get_blob: Option[Document.Blob] = None,
val header: Node.Header = Node.no_header,
val perspective: Node.Perspective_Command = Node.no_perspective_command,
_commands: Node.Commands = Node.Commands.empty)
{
def is_empty: Boolean =
get_blob.isEmpty &&
header == Node.no_header &&
Node.is_no_perspective_command(perspective) &&
commands.isEmpty
def commands: Linear_Set[Command] = _commands.commands
def load_commands: List[Command] = _commands.load_commands
def clear: Node = new Node(header = header)
def init_blob(blob: Document.Blob): Node = new Node(Some(blob.unchanged))
def update_header(new_header: Node.Header): Node =
new Node(get_blob, new_header, perspective, _commands)
def update_perspective(new_perspective: Node.Perspective_Command): Node =
new Node(get_blob, header, new_perspective, _commands)
def same_perspective(other_perspective: Node.Perspective_Command): Boolean =
perspective.required == other_perspective.required &&
perspective.visible.same(other_perspective.visible) &&
perspective.overlays == other_perspective.overlays
def update_commands(new_commands: Linear_Set[Command]): Node =
if (new_commands eq _commands.commands) this
else new Node(get_blob, header, perspective, Node.Commands(new_commands))
def command_iterator(i: Text.Offset = 0): Iterator[(Command, Text.Offset)] =
_commands.iterator(i)
def command_iterator(range: Text.Range): Iterator[(Command, Text.Offset)] =
command_iterator(range.start) takeWhile { case (_, start) => start < range.stop }
def command_start(cmd: Command): Option[Text.Offset] =
Node.Commands.starts(commands.iterator).find(_._1 == cmd).map(_._2)
}
/* development graph */
object Nodes
{
val empty: Nodes = new Nodes(Graph.empty(Node.Name.Ordering))
}
final class Nodes private(graph: Graph[Node.Name, Node])
{
def apply(name: Node.Name): Node =
graph.default_node(name, Node.empty).get_node(name)
def is_hidden(name: Node.Name): Boolean =
{
val graph1 = graph.default_node(name, Node.empty)
graph1.is_maximal(name) && graph1.get_node(name).is_empty
}
def + (entry: (Node.Name, Node)): Nodes =
{
val (name, node) = entry
val imports = node.header.imports
val graph1 =
(graph.default_node(name, Node.empty) /: imports)((g, p) => g.default_node(p, Node.empty))
val graph2 = (graph1 /: graph1.imm_preds(name))((g, dep) => g.del_edge(dep, name))
val graph3 = (graph2 /: imports)((g, dep) => g.add_edge(dep, name))
new Nodes(
if (graph3.is_maximal(name) && node.is_empty) graph3.del_node(name)
else graph3.map_node(name, _ => node)
)
}
def iterator: Iterator[(Node.Name, Node)] =
graph.iterator.map({ case (name, (node, _)) => (name, node) })
def load_commands(file_name: Node.Name): List[Command] =
(for {
(_, node) <- iterator
cmd <- node.load_commands.iterator
name <- cmd.blobs_names.iterator
if name == file_name
} yield cmd).toList
def descendants(names: List[Node.Name]): List[Node.Name] = graph.all_succs(names)
def topological_order: List[Node.Name] = graph.topological_order
override def toString: String = topological_order.mkString("Nodes(", ",", ")")
}
/** versioning **/
/* particular document versions */
object Version
{
val init: Version = new Version()
def make(syntax: Option[Prover.Syntax], nodes: Nodes): Version =
new Version(Document_ID.make(), syntax, nodes)
}
final class Version private(
val id: Document_ID.Version = Document_ID.none,
val syntax: Option[Prover.Syntax] = None,
val nodes: Nodes = Nodes.empty)
{
override def toString: String = "Version(" + id + ")"
}
/* changes of plain text, eventually resulting in document edits */
object Change
{
val init: Change = new Change()
def make(previous: Future[Version], edits: List[Edit_Text], version: Future[Version]): Change =
new Change(Some(previous), edits.reverse, version)
}
final class Change private(
val previous: Option[Future[Version]] = Some(Future.value(Version.init)),
val rev_edits: List[Edit_Text] = Nil,
val version: Future[Version] = Future.value(Version.init))
{
def is_finished: Boolean =
(previous match { case None => true case Some(future) => future.is_finished }) &&
version.is_finished
def truncate: Change = new Change(None, Nil, version)
}
/* history navigation */
object History
{
val init: History = new History()
}
final class History private(
val undo_list: List[Change] = List(Change.init)) // non-empty list
{
def tip: Change = undo_list.head
def + (change: Change): History = new History(change :: undo_list)
def prune(check: Change => Boolean, retain: Int): Option[(List[Change], History)] =
{
val n = undo_list.iterator.zipWithIndex.find(p => check(p._1)).get._2 + 1
val (retained, dropped) = undo_list.splitAt(n max retain)
retained.splitAt(retained.length - 1) match {
case (prefix, List(last)) => Some(dropped, new History(prefix ::: List(last.truncate)))
case _ => None
}
}
}
/* snapshot */
object Snapshot
{
val init = State.init.snapshot()
}
abstract class Snapshot
{
val state: State
val version: Version
val is_outdated: Boolean
def convert(i: Text.Offset): Text.Offset
def revert(i: Text.Offset): Text.Offset
def convert(range: Text.Range): Text.Range
def revert(range: Text.Range): Text.Range
val node_name: Node.Name
val node: Node
val load_commands: List[Command]
def is_loaded: Boolean
def eq_content(other: Snapshot): Boolean
def cumulate[A](
range: Text.Range,
info: A,
elements: Markup.Elements,
result: List[Command.State] => (A, Text.Markup) => Option[A],
status: Boolean = false): List[Text.Info[A]]
def select[A](
range: Text.Range,
elements: Markup.Elements,
result: List[Command.State] => Text.Markup => Option[A],
status: Boolean = false): List[Text.Info[A]]
}
/** global state -- document structure, execution process, editing history **/
type Assign_Update =
List[(Document_ID.Command, List[Document_ID.Exec])] // update of exec state assignment
object State
{
class Fail(state: State) extends Exception
object Assignment
{
val init: Assignment = new Assignment()
}
final class Assignment private(
val command_execs: Map[Document_ID.Command, List[Document_ID.Exec]] = Map.empty,
val is_finished: Boolean = false)
{
def check_finished: Assignment = { require(is_finished); this }
def unfinished: Assignment = new Assignment(command_execs, false)
def assign(update: Assign_Update): Assignment =
{
require(!is_finished)
val command_execs1 =
(command_execs /: update) {
case (res, (command_id, exec_ids)) =>
if (exec_ids.isEmpty) res - command_id
else res + (command_id -> exec_ids)
}
new Assignment(command_execs1, true)
}
}
val init: State =
State().define_version(Version.init, Assignment.init).assign(Version.init.id, Nil)._2
}
final case class State private(
/*reachable versions*/
val versions: Map[Document_ID.Version, Version] = Map.empty,
/*inlined auxiliary files*/
val blobs: Set[SHA1.Digest] = Set.empty,
/*static markup from define_command*/
val commands: Map[Document_ID.Command, Command.State] = Map.empty,
/*dynamic markup from execution*/
val execs: Map[Document_ID.Exec, Command.State] = Map.empty,
/*command-exec assignment for each version*/
val assignments: Map[Document_ID.Version, State.Assignment] = Map.empty,
/*commands with markup produced by other commands (imm_succs)*/
val commands_redirection: Graph[Document_ID.Command, Unit] = Graph.long,
/*explicit (linear) history*/
val history: History = History.init)
{
private def fail[A]: A = throw new State.Fail(this)
def define_version(version: Version, assignment: State.Assignment): State =
{
val id = version.id
copy(versions = versions + (id -> version),
assignments = assignments + (id -> assignment.unfinished))
}
def define_blob(digest: SHA1.Digest): State = copy(blobs = blobs + digest)
def defined_blob(digest: SHA1.Digest): Boolean = blobs.contains(digest)
def define_command(command: Command): State =
{
val id = command.id
copy(commands = commands + (id -> command.init_state))
}
def defined_command(id: Document_ID.Command): Boolean = commands.isDefinedAt(id)
def find_command(version: Version, id: Document_ID.Generic): Option[(Node, Command)] =
commands.get(id) orElse execs.get(id) match {
case None => None
case Some(st) =>
val command = st.command
val node = version.nodes(command.node_name)
if (node.commands.contains(command)) Some((node, command)) else None
}
def the_version(id: Document_ID.Version): Version = versions.getOrElse(id, fail)
def the_static_state(id: Document_ID.Command): Command.State = commands.getOrElse(id, fail)
def the_dynamic_state(id: Document_ID.Exec): Command.State = execs.getOrElse(id, fail)
def the_assignment(version: Version): State.Assignment = assignments.getOrElse(version.id, fail)
private def self_id(st: Command.State)(id: Document_ID.Generic): Boolean =
id == st.command.id ||
(execs.get(id) match { case Some(st1) => st1.command.id == st.command.id case None => false })
private def other_id(id: Document_ID.Generic)
: Option[(Symbol.Text_Chunk.Id, Symbol.Text_Chunk)] = None
/* FIXME
(execs.get(id) orElse commands.get(id)).map(st =>
((Symbol.Text_Chunk.Id(st.command.id), st.command.chunk)))
*/
private def redirection(st: Command.State): Graph[Document_ID.Command, Unit] =
(commands_redirection /: st.markups.redirection_iterator)({ case (graph, id) =>
graph.default_node(id, ()).default_node(st.command.id, ()).add_edge(id, st.command.id) })
def accumulate(id: Document_ID.Generic, message: XML.Elem): (Command.State, State) =
{
execs.get(id) match {
case Some(st) =>
val new_st = st.accumulate(self_id(st), other_id _, message)
val execs1 = execs + (id -> new_st)
(new_st, copy(execs = execs1, commands_redirection = redirection(new_st)))
case None =>
commands.get(id) match {
case Some(st) =>
val new_st = st.accumulate(self_id(st), other_id _, message)
val commands1 = commands + (id -> new_st)
(new_st, copy(commands = commands1, commands_redirection = redirection(new_st)))
case None => fail
}
}
}
def assign(id: Document_ID.Version, update: Assign_Update): (List[Command], State) =
{
val version = the_version(id)
def upd(exec_id: Document_ID.Exec, st: Command.State)
: Option[(Document_ID.Exec, Command.State)] =
if (execs.isDefinedAt(exec_id)) None else Some(exec_id -> st)
val (changed_commands, new_execs) =
((Nil: List[Command], execs) /: update) {
case ((commands1, execs1), (command_id, exec)) =>
val st = the_static_state(command_id)
val command = st.command
val commands2 = command :: commands1
val execs2 =
exec match {
case Nil => execs1
case eval_id :: print_ids =>
execs1 ++ upd(eval_id, st) ++
(for (id <- print_ids; up <- upd(id, command.empty_state)) yield up)
}
(commands2, execs2)
}
val new_assignment = the_assignment(version).assign(update)
val new_state = copy(assignments = assignments + (id -> new_assignment), execs = new_execs)
(changed_commands, new_state)
}
def is_assigned(version: Version): Boolean =
assignments.get(version.id) match {
case Some(assgn) => assgn.is_finished
case None => false
}
def is_stable(change: Change): Boolean =
change.is_finished && is_assigned(change.version.get_finished)
def recent_finished: Change = history.undo_list.find(_.is_finished) getOrElse fail
def recent_stable: Change = history.undo_list.find(is_stable) getOrElse fail
def tip_stable: Boolean = is_stable(history.tip)
def tip_version: Version = history.tip.version.get_finished
def continue_history(
previous: Future[Version],
edits: List[Edit_Text],
version: Future[Version]): State =
{
val change = Change.make(previous, edits, version)
copy(history = history + change)
}
def prune_history(retain: Int = 0): (List[Version], State) =
{
history.prune(is_stable, retain) match {
case Some((dropped, history1)) =>
val dropped_versions = dropped.map(change => change.version.get_finished)
val state1 = copy(history = history1)
(dropped_versions, state1)
case None => fail
}
}
def removed_versions(removed: List[Document_ID.Version]): State =
{
val versions1 = versions -- removed
val assignments1 = assignments -- removed
var blobs1 = Set.empty[SHA1.Digest]
var commands1 = Map.empty[Document_ID.Command, Command.State]
var execs1 = Map.empty[Document_ID.Exec, Command.State]
for {
(version_id, version) <- versions1.iterator
command_execs = assignments1(version_id).command_execs
(_, node) <- version.nodes.iterator
command <- node.commands.iterator
} {
for (digest <- command.blobs_digests; if !blobs1.contains(digest))
blobs1 += digest
if (!commands1.isDefinedAt(command.id))
commands.get(command.id).foreach(st => commands1 += (command.id -> st))
for (exec_id <- command_execs.getOrElse(command.id, Nil)) {
if (!execs1.isDefinedAt(exec_id))
execs.get(exec_id).foreach(st => execs1 += (exec_id -> st))
}
}
copy(
versions = versions1,
blobs = blobs1,
commands = commands1,
execs = execs1,
commands_redirection = commands_redirection.restrict(commands1.isDefinedAt(_)),
assignments = assignments1)
}
private def command_states_self(version: Version, command: Command)
: List[(Document_ID.Generic, Command.State)] =
{
require(is_assigned(version))
try {
the_assignment(version).check_finished.command_execs.getOrElse(command.id, Nil)
.map(id => id -> the_dynamic_state(id)) match {
case Nil => fail
case res => res
}
}
catch {
case _: State.Fail =>
try { List(command.id -> the_static_state(command.id)) }
catch { case _: State.Fail => List(command.id -> command.init_state) }
}
}
def command_states(version: Version, command: Command): List[Command.State] =
{
val self = command_states_self(version, command)
val others =
if (commands_redirection.defined(command.id)) {
(for {
command_id <- commands_redirection.imm_succs(command.id).iterator
(id, st) <- command_states_self(version, the_static_state(command_id).command)
if !self.exists(_._1 == id)
} yield (id, st)).toMap.valuesIterator.toList
}
else Nil
self.map(_._2) ::: others.flatMap(_.redirect(command))
}
def command_results(version: Version, command: Command): Command.Results =
Command.State.merge_results(command_states(version, command))
def command_markup(version: Version, command: Command, index: Command.Markup_Index,
range: Text.Range, elements: Markup.Elements): Markup_Tree =
Command.State.merge_markup(command_states(version, command), index, range, elements)
def markup_to_XML(version: Version, node: Node, elements: Markup.Elements): XML.Body =
(for {
command <- node.commands.iterator
markup =
command_markup(version, command, Command.Markup_Index.markup, command.range, elements)
tree <- markup.to_XML(command.range, command.source, elements)
} yield tree).toList
// persistent user-view
def snapshot(name: Node.Name = Node.Name.empty, pending_edits: List[Text.Edit] = Nil)
: Snapshot =
{
val stable = recent_stable
val latest = history.tip
/* pending edits and unstable changes */
val rev_pending_changes =
for {
change <- history.undo_list.takeWhile(_ != stable)
(a, edits) <- change.rev_edits
if a == name
} yield edits
val is_cleared = rev_pending_changes.exists({ case Node.Clear() => true case _ => false })
val edits =
if (is_cleared) Nil
else
(pending_edits /: rev_pending_changes)({
case (edits, Node.Edits(es)) => es ::: edits
case (edits, _) => edits
})
lazy val reverse_edits = edits.reverse
new Snapshot
{
/* global information */
val state = State.this
val version = stable.version.get_finished
val is_outdated = !(pending_edits.isEmpty && latest == stable)
/* local node content */
def convert(offset: Text.Offset) =
if (is_cleared) 0 else (offset /: edits)((i, edit) => edit.convert(i))
def revert(offset: Text.Offset) =
if (is_cleared) 0 else (offset /: reverse_edits)((i, edit) => edit.revert(i))
def convert(range: Text.Range) = range.map(convert(_))
def revert(range: Text.Range) = range.map(revert(_))
val node_name = name
val node = version.nodes(name)
val load_commands: List[Command] =
if (node_name.is_theory) Nil
else version.nodes.load_commands(node_name)
val is_loaded: Boolean = node_name.is_theory || !load_commands.isEmpty
def eq_content(other: Snapshot): Boolean =
{
def eq_commands(commands: (Command, Command)): Boolean =
{
val states1 = state.command_states(version, commands._1)
val states2 = other.state.command_states(other.version, commands._2)
states1.length == states2.length &&
(states1 zip states2).forall({ case (st1, st2) => st1 eq_content st2 })
}
!is_outdated && !other.is_outdated &&
node.commands.size == other.node.commands.size &&
(node.commands.iterator zip other.node.commands.iterator).forall(eq_commands) &&
load_commands.length == other.load_commands.length &&
(load_commands zip other.load_commands).forall(eq_commands)
}
/* cumulate markup */
def cumulate[A](
range: Text.Range,
info: A,
elements: Markup.Elements,
result: List[Command.State] => (A, Text.Markup) => Option[A],
status: Boolean = false): List[Text.Info[A]] =
{
val former_range = revert(range).inflate_singularity
val (chunk_name, command_iterator) =
load_commands match {
case command :: _ => (Symbol.Text_Chunk.File(node_name.node), Iterator((command, 0)))
case _ => (Symbol.Text_Chunk.Default, node.command_iterator(former_range))
}
val markup_index = Command.Markup_Index(status, chunk_name)
(for {
(command, command_start) <- command_iterator
chunk <- command.chunks.get(chunk_name).iterator
states = state.command_states(version, command)
res = result(states)
markup_range <- (former_range - command_start).try_restrict(chunk.range).iterator
markup = Command.State.merge_markup(states, markup_index, markup_range, elements)
Text.Info(r0, a) <- markup.cumulate[A](markup_range, info, elements,
{
case (a, Text.Info(r0, b)) => res(a, Text.Info(convert(r0 + command_start), b))
}).iterator
r1 <- convert(r0 + command_start).try_restrict(range).iterator
} yield Text.Info(r1, a)).toList
}
def select[A](
range: Text.Range,
elements: Markup.Elements,
result: List[Command.State] => Text.Markup => Option[A],
status: Boolean = false): List[Text.Info[A]] =
{
def result1(states: List[Command.State]): (Option[A], Text.Markup) => Option[Option[A]] =
{
val res = result(states)
(_: Option[A], x: Text.Markup) =>
res(x) match {
case None => None
case some => Some(some)
}
}
for (Text.Info(r, Some(x)) <- cumulate(range, None, elements, result1 _, status))
yield Text.Info(r, x)
}
/* output */
override def toString: String =
"Snapshot(node = " + node_name.node + ", version = " + version.id +
(if (is_outdated) ", outdated" else "") + ")"
}
}
}
}