(*  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, name, text] =>

      Document.change_state (Document.define_command (Document.parse_id id) name text));

val _ =

  Isabelle_Process.add_command "Isar_Document.cancel_execution"

    (fn [] => ignore (Document.cancel_execution (Document.state ())));

val _ =

  Isabelle_Process.add_command "Isar_Document.update_perspective"

    (fn [old_id_string, new_id_string, name, ids_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 ids = YXML.parse_body ids_yxml

          |> let open XML.Decode in list int end;

        val _ = Future.join_tasks (Document.cancel_execution state);

      in

        state

        |> Document.update_perspective old_id new_id name ids

        |> Document.execute new_id

      end));

val _ =

  Isabelle_Process.add_command "Isar_Document.update"

    (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)),

                  fn (a, []) => Document.Perspective (map int_atom a)]))

            end;

        val running = Document.cancel_execution state;

        val (assignment, state1) = Document.update old_id new_id edits state;

        val _ = Future.join_tasks running;

        val state2 = Document.join_commands state1;

        val _ =

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

            (assignment |>

              let open XML.Encode

              in pair (list (pair int (option int))) (list (pair string (option int))) end

              |> YXML.string_of_body));

        val state3 = Document.execute new_id state2;

      in state3 end));

val _ =

  Isabelle_Process.add_command "Isar_Document.invoke_scala"

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

end;