author | wenzelm |
Tue, 07 Aug 2012 15:01:48 +0200 | |
changeset 48707 | ba531af91148 |
parent 48706 | e2b512024eab |
child 48718 | 73e6c22e2d94 |
permissions | -rw-r--r-- |
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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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/** nested structure **/ |
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object Structure |
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{ |
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sealed abstract class Entry { def length: Int } |
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case class Block(val name: String, val body: List[Entry]) extends Entry |
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{ |
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val length: Int = (0 /: body)(_ + _.length) |
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} |
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case class Atom(val command: Command) extends Entry |
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{ |
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def length: Int = command.length |
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} |
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def parse(syntax: Outer_Syntax, node_name: Document.Node.Name, text: CharSequence): Entry = |
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{ |
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/* stack operations */ |
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def buffer(): mutable.ListBuffer[Entry] = new mutable.ListBuffer[Entry] |
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var stack: List[(Int, String, mutable.ListBuffer[Entry])] = |
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List((0, "theory " + node_name.theory, buffer())) |
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@tailrec def close(level: Int => Boolean) |
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{ |
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stack match { |
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case (lev, name, body) :: (_, _, body2) :: rest if level(lev) => |
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body2 += Block(name, body.toList) |
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stack = stack.tail |
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close(level) |
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case _ => |
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} |
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} |
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def result(): Entry = |
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{ |
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close(_ => true) |
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val (_, name, body) = stack.head |
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Block(name, body.toList) |
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} |
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def add(command: Command) |
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{ |
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syntax.heading_level(command) match { |
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case Some(i) => |
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close(_ > i) |
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stack = (i + 1, command.source, buffer()) :: stack |
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case None => |
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} |
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stack.head._3 += Atom(command) |
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} |
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/* result structure */ |
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val spans = parse_spans(syntax.scan(text)) |
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spans.foreach(span => add(Command(Document.no_id, node_name, span))) |
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result() |
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} |
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} |
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/** parse spans **/ |
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def parse_spans(toks: List[Token]): List[List[Token]] = |
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{ |
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val result = new mutable.ListBuffer[List[Token]] |
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val span = new mutable.ListBuffer[Token] |
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def flush() { if (!span.isEmpty) { result += span.toList; span.clear } } |
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for (tok <- toks) { if (tok.is_command) flush(); span += tok } |
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flush() |
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result.toList |
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} |
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/** perspective **/ |
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def command_perspective(node: Document.Node, perspective: Text.Perspective): Command.Perspective = |
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{ |
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if (perspective.is_empty) Command.Perspective.empty |
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else { |
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val result = 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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(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 -1 => check_ranges(more_ranges, commands) |
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case 0 => |
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result += command |
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check_ranges(ranges, more_commands) |
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case 1 => check_ranges(ranges, more_commands) |
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} |
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case _ => |
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} |
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} |
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check_ranges(perspective.ranges, node.command_range(perspective.range).toStream) |
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Command.Perspective(result.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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base_syntax: Outer_Syntax, |
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previous: Document.Version, |
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edits: List[Document.Edit_Text]) |
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: (Outer_Syntax, List[Document.Node.Name], Document.Nodes, List[Document.Edit_Command]) = |
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{ |
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var updated_imports = false |
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var updated_keywords = false |
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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.isEmpty || !header.errors.isEmpty || node.header != header |
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if (update_header) { |
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val node1 = node.update_header(header) |
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updated_imports = updated_imports || (node.header.imports != node1.header.imports) |
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updated_keywords = updated_keywords || (node.header.keywords != node1.header.keywords) |
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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 = |
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if (previous.is_init || updated_keywords) |
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(base_syntax /: nodes.entries) { case (syn, (_, node)) => syn.add_keywords(node.header) } |
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else previous.syntax |
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val reparse = |
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if (updated_imports || updated_keywords) |
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nodes.descendants(doc_edits.iterator.map(_._1).toList) |
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else Nil |
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(syntax, reparse, nodes, doc_edits.toList) |
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} |
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/** text edits **/ |
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/* phase 1: edit individual command source */ |
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@tailrec private def edit_text(eds: List[Text.Edit], commands: Linear_Set[Command]) |
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: 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.command_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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|
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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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|
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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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|
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|
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/* phase 2: recover command spans */ |
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|
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@tailrec private def recover_spans( |
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syntax: Outer_Syntax, |
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node_name: Document.Node.Name, |
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commands: Linear_Set[Command]): Linear_Set[Command] = |
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203 |
{ |
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commands.iterator.find(cmd => !cmd.is_defined) match { |
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case Some(first_undefined) => |
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val first = |
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commands.reverse_iterator(first_undefined). |
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dropWhile(_.newlines == 0).find(_.is_command) getOrElse commands.head |
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val last = |
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commands.iterator(first_undefined). |
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dropWhile(_.newlines == 0).find(_.is_command) getOrElse commands.last |
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val range = |
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commands.iterator(first).takeWhile(_ != last).toList ::: List(last) |
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214 |
|
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val spans0 = parse_spans(syntax.scan(range.map(_.source).mkString)) |
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|
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val (before_edit, spans1) = |
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if (!spans0.isEmpty && first.is_command && first.span == spans0.head) |
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(Some(first), spans0.tail) |
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else (commands.prev(first), spans0) |
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|
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val (after_edit, spans2) = |
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if (!spans1.isEmpty && last.is_command && last.span == spans1.last) |
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(Some(last), spans1.take(spans1.length - 1)) |
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else (commands.next(last), spans1) |
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|
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val inserted = spans2.map(span => Command(Document.new_id(), node_name, span)) |
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val new_commands = |
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commands.delete_between(before_edit, after_edit).append_after(before_edit, inserted) |
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recover_spans(syntax, node_name, new_commands) |
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231 |
|
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case None => commands |
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233 |
} |
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234 |
} |
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235 |
|
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236 |
|
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237 |
/* phase 3: full reparsing after syntax change */ |
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238 |
|
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private def reparse_spans( |
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syntax: Outer_Syntax, |
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node_name: Document.Node.Name, |
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commands: Linear_Set[Command]): Linear_Set[Command] = |
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243 |
{ |
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val cmds = commands.toList |
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val spans1 = parse_spans(syntax.scan(cmds.map(_.source).mkString)) |
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if (cmds.map(_.span) == spans1) commands |
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else Linear_Set(spans1.map(span => Command(Document.new_id(), node_name, span)): _*) |
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248 |
} |
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249 |
|
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250 |
|
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251 |
/* main phase */ |
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252 |
|
43722 | 253 |
def text_edits( |
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254 |
base_syntax: Outer_Syntax, |
43722 | 255 |
previous: Document.Version, |
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256 |
edits: List[Document.Edit_Text]) |
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: (List[Document.Edit_Command], Document.Version) = |
38374 | 258 |
{ |
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val (syntax, reparse, nodes0, doc_edits0) = header_edits(base_syntax, previous, edits) |
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val reparse_set = reparse.toSet |
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261 |
|
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var nodes = nodes0 |
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val doc_edits = new mutable.ListBuffer[Document.Edit_Command]; doc_edits ++= doc_edits0 |
38374 | 264 |
|
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(edits ::: reparse.map((_, Document.Node.Edits(Nil)))) foreach { |
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266 |
case (name, Document.Node.Clear()) => |
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doc_edits += (name -> Document.Node.Clear()) |
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nodes += (name -> nodes(name).clear) |
38374 | 269 |
|
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case (name, Document.Node.Edits(text_edits)) => |
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val node = nodes(name) |
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val commands0 = node.commands |
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val commands1 = edit_text(text_edits, commands0) |
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274 |
val commands2 = recover_spans(syntax, name, commands1) // FIXME somewhat slow |
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275 |
val commands3 = |
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276 |
if (reparse_set.contains(name)) reparse_spans(syntax, name, commands2) // slow |
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277 |
else commands2 |
38374 | 278 |
|
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279 |
val removed_commands = commands0.iterator.filter(!commands3.contains(_)).toList |
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280 |
val inserted_commands = commands3.iterator.filter(!commands0.contains(_)).toList |
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281 |
|
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282 |
val cmd_edits = |
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283 |
removed_commands.reverse.map(cmd => (commands0.prev(cmd), None)) ::: |
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284 |
inserted_commands.map(cmd => (commands3.prev(cmd), Some(cmd))) |
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285 |
|
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286 |
doc_edits += (name -> Document.Node.Edits(cmd_edits)) |
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287 |
nodes += (name -> node.update_commands(commands3)) |
38374 | 288 |
|
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289 |
case (name, Document.Node.Deps(_)) => |
38374 | 290 |
|
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291 |
case (name, Document.Node.Perspective(text_perspective)) => |
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292 |
val node = nodes(name) |
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293 |
val perspective = command_perspective(node, text_perspective) |
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294 |
if (!(node.perspective same perspective)) { |
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295 |
doc_edits += (name -> Document.Node.Perspective(perspective)) |
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296 |
nodes += (name -> node.update_perspective(perspective)) |
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297 |
} |
38374 | 298 |
} |
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299 |
(doc_edits.toList, Document.Version.make(syntax, nodes)) |
38374 | 300 |
} |
34268 | 301 |
} |