/* Title: Pure/Thy/thy_syntax.scala
Author: Makarius
Superficial theory syntax: tokens and spans.
*/
package isabelle
import scala.collection.mutable
import scala.annotation.tailrec
object Thy_Syntax
{
/** perspective **/
def command_perspective(
node: Document.Node,
perspective: Text.Perspective,
overlays: Document.Node.Overlays): (Command.Perspective, Command.Perspective) =
{
if (perspective.is_empty && overlays.is_empty)
(Command.Perspective.empty, Command.Perspective.empty)
else {
val has_overlay = overlays.commands
val visible = new mutable.ListBuffer[Command]
val visible_overlay = new mutable.ListBuffer[Command]
@tailrec
def check_ranges(ranges: List[Text.Range], commands: Stream[(Command, Text.Offset)])
{
(ranges, commands) match {
case (range :: more_ranges, (command, offset) #:: more_commands) =>
val command_range = command.range + offset
range compare command_range match {
case 0 =>
visible += command
visible_overlay += command
check_ranges(ranges, more_commands)
case c =>
if (has_overlay(command)) visible_overlay += command
if (c < 0) check_ranges(more_ranges, commands)
else check_ranges(ranges, more_commands)
}
case (Nil, (command, _) #:: more_commands) =>
if (has_overlay(command)) visible_overlay += command
check_ranges(Nil, more_commands)
case _ =>
}
}
val commands =
(if (overlays.is_empty) node.command_iterator(perspective.range)
else node.command_iterator()).toStream
check_ranges(perspective.ranges, commands)
(Command.Perspective(visible.toList), Command.Perspective(visible_overlay.toList))
}
}
/** header edits: graph structure and outer syntax **/
private def header_edits(
resources: Resources,
previous: Document.Version,
edits: List[Document.Edit_Text]):
(List[Document.Node.Name], Document.Nodes, List[Document.Edit_Command]) =
{
val syntax_changed0 = new mutable.ListBuffer[Document.Node.Name]
var nodes = previous.nodes
val doc_edits = new mutable.ListBuffer[Document.Edit_Command]
edits foreach {
case (name, Document.Node.Deps(header)) =>
val node = nodes(name)
val update_header =
node.header.errors.nonEmpty || header.errors.nonEmpty || node.header != header
if (update_header) {
val node1 = node.update_header(header)
if (node.header.imports.map(_._1) != node1.header.imports.map(_._1) ||
node.header.keywords != node1.header.keywords ||
node.header.errors != node1.header.errors) syntax_changed0 += name
nodes += (name -> node1)
doc_edits += (name -> Document.Node.Deps(header))
}
case _ =>
}
val syntax_changed = nodes.descendants(syntax_changed0.toList)
for (name <- syntax_changed) {
val node = nodes(name)
val syntax =
if (node.is_empty) None
else {
val header = node.header
val imports_syntax = header.imports.flatMap(a => nodes(a._1).syntax)
Some((resources.base_syntax /: imports_syntax)(_ ++ _).add_keywords(header.keywords))
}
nodes += (name -> node.update_syntax(syntax))
}
(syntax_changed, nodes, doc_edits.toList)
}
/** text edits **/
/* edit individual command source */
@tailrec def edit_text(eds: List[Text.Edit], commands: Linear_Set[Command]): Linear_Set[Command] =
{
eds match {
case e :: es =>
Document.Node.Commands.starts(commands.iterator).find {
case (cmd, cmd_start) =>
e.can_edit(cmd.source, cmd_start) ||
e.is_insert && e.start == cmd_start + cmd.length
} match {
case Some((cmd, cmd_start)) if e.can_edit(cmd.source, cmd_start) =>
val (rest, text) = e.edit(cmd.source, cmd_start)
val new_commands = commands.insert_after(Some(cmd), Command.unparsed(text)) - cmd
edit_text(rest.toList ::: es, new_commands)
case Some((cmd, cmd_start)) =>
edit_text(es, commands.insert_after(Some(cmd), Command.unparsed(e.text)))
case None =>
require(e.is_insert && e.start == 0)
edit_text(es, commands.insert_after(None, Command.unparsed(e.text)))
}
case Nil => commands
}
}
/* reparse range of command spans */
@tailrec private def chop_common(
cmds: List[Command],
blobs_spans: List[(Command.Blobs_Info, Command_Span.Span)])
: (List[Command], List[(Command.Blobs_Info, Command_Span.Span)]) =
{
(cmds, blobs_spans) match {
case (cmd :: cmds, (blobs_info, span) :: rest)
if cmd.blobs_info == blobs_info && cmd.span == span => chop_common(cmds, rest)
case _ => (cmds, blobs_spans)
}
}
private def reparse_spans(
resources: Resources,
syntax: Prover.Syntax,
get_blob: Document.Node.Name => Option[Document.Blob],
can_import: Document.Node.Name => Boolean,
node_name: Document.Node.Name,
commands: Linear_Set[Command],
first: Command, last: Command): Linear_Set[Command] =
{
val cmds0 = commands.iterator(first, last).toList
val blobs_spans0 =
syntax.parse_spans(cmds0.iterator.map(_.source).mkString).map(span =>
(Command.blobs_info(resources, syntax, get_blob, can_import, node_name, span), span))
val (cmds1, blobs_spans1) = chop_common(cmds0, blobs_spans0)
val (rev_cmds2, rev_blobs_spans2) = chop_common(cmds1.reverse, blobs_spans1.reverse)
val cmds2 = rev_cmds2.reverse
val blobs_spans2 = rev_blobs_spans2.reverse
cmds2 match {
case Nil =>
assert(blobs_spans2.isEmpty)
commands
case cmd :: _ =>
val hook = commands.prev(cmd)
val inserted =
blobs_spans2.map({ case (blobs, span) =>
Command(Document_ID.make(), node_name, blobs, span) })
(commands /: cmds2)(_ - _).append_after(hook, inserted)
}
}
/* main */
def diff_commands(old_cmds: Linear_Set[Command], new_cmds: Linear_Set[Command])
: List[Command.Edit] =
{
val removed = old_cmds.iterator.filter(!new_cmds.contains(_)).toList
val inserted = new_cmds.iterator.filter(!old_cmds.contains(_)).toList
removed.reverse.map(cmd => (old_cmds.prev(cmd), None)) :::
inserted.map(cmd => (new_cmds.prev(cmd), Some(cmd)))
}
private def text_edit(
resources: Resources,
syntax: Prover.Syntax,
get_blob: Document.Node.Name => Option[Document.Blob],
can_import: Document.Node.Name => Boolean,
reparse_limit: Int,
node: Document.Node, edit: Document.Edit_Text): Document.Node =
{
/* recover command spans after edits */
// FIXME somewhat slow
def recover_spans(
name: Document.Node.Name,
perspective: Command.Perspective,
commands: Linear_Set[Command]): Linear_Set[Command] =
{
val is_visible = perspective.commands.toSet
def next_invisible(cmds: Linear_Set[Command], from: Command): Command =
cmds.iterator(from).dropWhile(cmd => !cmd.is_proper || is_visible(cmd))
.find(_.is_proper) getOrElse cmds.last
@tailrec def recover(cmds: Linear_Set[Command]): Linear_Set[Command] =
cmds.find(_.is_unparsed) match {
case Some(first_unparsed) =>
val first = next_invisible(cmds.reverse, first_unparsed)
val last = next_invisible(cmds, first_unparsed)
recover(
reparse_spans(resources, syntax, get_blob, can_import, name, cmds, first, last))
case None => cmds
}
recover(commands)
}
edit match {
case (_, Document.Node.Clear()) => node.clear
case (_, Document.Node.Blob(blob)) => node.init_blob(blob)
case (name, Document.Node.Edits(text_edits)) =>
if (name.is_theory) {
val commands0 = node.commands
val commands1 = edit_text(text_edits, commands0)
val commands2 = recover_spans(name, node.perspective.visible, commands1)
node.update_commands(commands2)
}
else node
case (_, Document.Node.Deps(_)) => node
case (name, Document.Node.Perspective(required, text_perspective, overlays)) =>
val (visible, visible_overlay) = command_perspective(node, text_perspective, overlays)
val perspective: Document.Node.Perspective_Command =
Document.Node.Perspective(required, visible_overlay, overlays)
if (node.same_perspective(text_perspective, perspective)) node
else {
/* consolidate unfinished spans */
val is_visible = visible.commands.toSet
val commands = node.commands
val commands1 =
if (is_visible.isEmpty) commands
else {
commands.find(_.is_unfinished) match {
case Some(first_unfinished) =>
commands.reverse.find(is_visible) match {
case Some(last_visible) =>
val it = commands.iterator(last_visible)
var last = last_visible
var i = 0
while (i < reparse_limit && it.hasNext) {
last = it.next
i += last.length
}
reparse_spans(resources, syntax, get_blob, can_import,
name, commands, first_unfinished, last)
case None => commands
}
case None => commands
}
}
node.update_perspective(text_perspective, perspective).update_commands(commands1)
}
}
}
def parse_change(
resources: Resources,
reparse_limit: Int,
previous: Document.Version,
doc_blobs: Document.Blobs,
edits: List[Document.Edit_Text]): Session.Change =
{
val (syntax_changed, nodes0, doc_edits0) = header_edits(resources, previous, edits)
def get_blob(name: Document.Node.Name) =
doc_blobs.get(name) orElse previous.nodes(name).get_blob
def can_import(name: Document.Node.Name): Boolean =
resources.loaded_theories(name.theory) || nodes0(name).has_header
val (doc_edits, version) =
if (edits.isEmpty) (Nil, Document.Version.make(previous.nodes))
else {
val reparse =
(syntax_changed /: nodes0.iterator)({
case (reparse, (name, node)) =>
if (node.load_commands.exists(_.blobs_changed(doc_blobs)) && !reparse.contains(name))
name :: reparse
else reparse
})
val reparse_set = reparse.toSet
var nodes = nodes0
val doc_edits = new mutable.ListBuffer[Document.Edit_Command]; doc_edits ++= doc_edits0
val node_edits =
(edits ::: reparse.map((_, Document.Node.Edits(Nil)))).groupBy(_._1)
.asInstanceOf[Map[Document.Node.Name, List[Document.Edit_Text]]] // FIXME ???
node_edits foreach {
case (name, edits) =>
val node = nodes(name)
val syntax = node.syntax getOrElse resources.base_syntax
val commands = node.commands
val node1 =
if (reparse_set(name) && commands.nonEmpty)
node.update_commands(
reparse_spans(resources, syntax, get_blob, can_import, name,
commands, commands.head, commands.last))
else node
val node2 =
(node1 /: edits)(
text_edit(resources, syntax, get_blob, can_import, reparse_limit, _, _))
val node3 =
if (reparse_set.contains(name))
text_edit(resources, syntax, get_blob, can_import, reparse_limit,
node2, (name, node2.edit_perspective))
else node2
if (!(node.same_perspective(node3.text_perspective, node3.perspective)))
doc_edits += (name -> node3.perspective)
doc_edits += (name -> Document.Node.Edits(diff_commands(commands, node3.commands)))
nodes += (name -> node3)
}
(doc_edits.toList.filterNot(_._2.is_void), Document.Version.make(nodes))
}
Session.Change(previous, syntax_changed, syntax_changed.nonEmpty, doc_edits, version)
}
}