src/Pure/System/isar_document.scala

renamed class Document to Document.Version etc.;
renamed Change.prev to Change.previous, and Change.document to Change.current;
tuned;

/*  Title:      Pure/System/isar_document.scala
    Author:     Makarius

Interactive Isar documents.
*/

package isabelle


object Isar_Document
{
  /* protocol messages */

  object Assign {
    def unapply(msg: XML.Tree)
        : Option[(Document.Version_ID, List[(Document.Command_ID, Document.Exec_ID)])] =
      msg match {
        case XML.Elem(Markup(Markup.ASSIGN, List((Markup.VERSION, Document.ID(id)))), edits) =>
          val id_edits = edits.map(Edit.unapply)
          if (id_edits.forall(_.isDefined)) Some((id, id_edits.map(_.get)))
          else None
        case _ => None
      }
  }

  object Edit {
    def unapply(msg: XML.Tree): Option[(Document.Command_ID, Document.Exec_ID)] =
      msg match {
        case XML.Elem(
          Markup(Markup.EDIT,
            List((Markup.ID, Document.ID(i)), (Markup.EXEC, Document.ID(j)))), Nil) => Some((i, j))
        case _ => None
      }
  }
}


trait Isar_Document extends Isabelle_Process
{
  import Isar_Document._


  /* commands */

  def define_command(id: Document.Command_ID, text: String): Unit =
    input("Isar_Document.define_command", Document.ID(id), text)


  /* document versions */

  def edit_version(old_id: Document.Version_ID, new_id: Document.Version_ID,
      edits: List[Document.Edit[Document.Command_ID]])
  {
    def make_id1(id1: Option[Document.Command_ID]): XML.Body =
      XML_Data.make_long(id1 getOrElse Document.NO_ID)

    val arg =
      XML_Data.make_list(
        XML_Data.make_pair(XML_Data.make_string)(
          XML_Data.make_option(XML_Data.make_list(
              XML_Data.make_pair(make_id1)(XML_Data.make_option(XML_Data.make_long))))))(edits)

    input("Isar_Document.edit_version",
      Document.ID(old_id), Document.ID(new_id), YXML.string_of_body(arg))
  }
}