(*  Title:      Pure/PIDE/isar_document.ML

    Author:     Makarius

Protocol message formats for interactive Isar documents.

*)

structure Isar_Document: sig end =

struct

val _ =

  Isabelle_Process.add_command "Isar_Document.define_command"

    (fn [id, text] => Document.change_state (Document.define_command (Document.parse_id id) text));

val _ =

  Isabelle_Process.add_command "Isar_Document.edit_version"

    (fn [old_id_string, new_id_string, edits_yxml] => Document.change_state (fn state =>

      let

        val old_id = Document.parse_id old_id_string;

        val new_id = Document.parse_id new_id_string;

        val edits =

          YXML.parse_body edits_yxml |>

            let open XML.Decode in

              list (pair string

                (variant

                 [fn ([], []) => Document.Clear,

                  fn ([], a) => Document.Edits (list (pair (option int) (option int)) a),

                  fn ([], a) =>

                    Document.Header

                      (Exn.Res (triple string (list string) (list (pair string bool)) a)),

                  fn ([a], []) => Document.Header (Exn.Exn (ERROR a))]))

            end;

      val running = Document.cancel_execution state;

      val (updates, state') = Document.edit old_id new_id edits state;

      val _ = Future.join_tasks running;

      val _ = Document.join_commands state';

      val _ =

        Output.status (Markup.markup (Markup.assign new_id)

          (implode (map (Markup.markup_only o Markup.edit) updates)));

      val state'' = Document.execute new_id state';

    in state'' end));

val _ =

  Isabelle_Process.add_command "Isar_Document.invoke_scala"

    (fn [id, tag, res] => Invoke_Scala.fulfill_method id tag res);

end;