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/*  Title:      Pure/PIDE/prover.scala
    Author:     Makarius

General prover operations.
*/

package isabelle


object Prover
{
  /* syntax */

  trait Syntax
  {
    def add_keywords(keywords: Thy_Header.Keywords): Syntax
    def scan(input: CharSequence): List[Token]
    def load(span: List[Token]): Option[List[String]]
    def load_commands_in(text: String): Boolean
  }


  /* messages */

  sealed abstract class Message

  class Input(val name: String, val args: List[String]) extends Message
  {
    override def toString: String =
      XML.Elem(Markup(Markup.PROVER_COMMAND, List((Markup.NAME, name))),
        args.map(s =>
          List(XML.Text("\n"), XML.elem(Markup.PROVER_ARG, YXML.parse_body(s)))).flatten).toString
  }

  class Output(val message: XML.Elem) extends Message
  {
    def kind: String = message.markup.name
    def properties: Properties.T = message.markup.properties
    def body: XML.Body = message.body

    def is_init = kind == Markup.INIT
    def is_exit = kind == Markup.EXIT
    def is_stdout = kind == Markup.STDOUT
    def is_stderr = kind == Markup.STDERR
    def is_system = kind == Markup.SYSTEM
    def is_status = kind == Markup.STATUS
    def is_report = kind == Markup.REPORT
    def is_syslog = is_init || is_exit || is_system || is_stderr

    override def toString: String =
    {
      val res =
        if (is_status || is_report) message.body.map(_.toString).mkString
        else Pretty.string_of(message.body)
      if (properties.isEmpty)
        kind.toString + " [[" + res + "]]"
      else
        kind.toString + " " +
          (for ((x, y) <- properties) yield x + "=" + y).mkString("{", ",", "}") + " [[" + res + "]]"
    }
  }

  class Protocol_Output(props: Properties.T, val bytes: Bytes)
    extends Output(XML.Elem(Markup(Markup.PROTOCOL, props), Nil))
  {
    lazy val text: String = bytes.toString
  }
}


trait Prover
{
  /* text and tree data */

  def encode(s: String): String
  def decode(s: String): String

  object Encode
  {
    val string: XML.Encode.T[String] = (s => XML.Encode.string(encode(s)))
  }

  def xml_cache: XML.Cache


  /* process management */

  def join(): Unit
  def terminate(): Unit

  def protocol_command_bytes(name: String, args: Bytes*): Unit
  def protocol_command(name: String, args: String*): Unit


  /* PIDE protocol commands */

  def options(opts: Options): Unit

  def define_blob(digest: SHA1.Digest, bytes: Bytes): Unit
  def define_command(command: Command): Unit

  def discontinue_execution(): Unit
  def cancel_exec(id: Document_ID.Exec): Unit

  def update(old_id: Document_ID.Version, new_id: Document_ID.Version,
    edits: List[Document.Edit_Command]): Unit
  def remove_versions(versions: List[Document.Version]): Unit

  def dialog_result(serial: Long, result: String): Unit
}