/*  Title:      Pure/PIDE/command.scala

    Author:     Fabian Immler, TU Munich

    Author:     Makarius

Prover commands with semantic state.

*/

package isabelle

object Command

{

  /** accumulated results from prover **/

  case class State(

    val command: Command,

    val status: List[Markup],

    val reverse_results: List[XML.Tree],

    val markup: Markup_Tree)

  {

    /* content */

    lazy val results = reverse_results.reverse

    def add_status(st: Markup): State = copy(status = st :: status)

    def add_markup(info: Text.Info[Any]): State = copy(markup = markup + info)

    def add_result(result: XML.Tree): State = copy(reverse_results = result :: reverse_results)

    def root_info: Text.Info[Any] =

      new Text.Info(command.range,

        XML.Elem(Markup(Markup.STATUS, Nil), status.reverse.map(XML.Elem(_, Nil))))

    def root_markup: Markup_Tree = markup + root_info

    /* message dispatch */

    def accumulate(message: XML.Tree): Command.State =

      message match {

        case XML.Elem(Markup(Markup.STATUS, _), msgs) =>

          (this /: msgs)((state, msg) =>

            msg match {

              case XML.Elem(markup, Nil) => state.add_status(markup)

              case _ => System.err.println("Ignored status message: " + msg); state

            })

        case XML.Elem(Markup(Markup.REPORT, _), msgs) =>

          (this /: msgs)((state, msg) =>

            msg match {

              case XML.Elem(Markup(name, atts @ Position.Range(range)), args)

              if Position.Id.unapply(atts) == Some(command.id) =>

                val props = atts.filterNot(p => Markup.POSITION_PROPERTIES(p._1))

                val info =

                  Text.Info[Any](command.decode(range), XML.Elem(Markup(name, props), args))

                state.add_markup(info)

              case _ => System.err.println("Ignored report message: " + msg); state

            })

        case _ => add_result(message)

      }

  }

  /* unparsed dummy commands */

  def unparsed(source: String) =

    new Command(Document.NO_ID, List(Token(Token.Kind.UNPARSED, source)))

}

class Command(

    val id: Document.Command_ID,

    val span: List[Token])

{

  /* classification */

  def is_command: Boolean = !span.isEmpty && span.head.is_command

  def is_ignored: Boolean = span.forall(_.is_ignored)

  def is_malformed: Boolean = !is_command && !is_ignored

  def is_unparsed = id == Document.NO_ID

  def name: String = if (is_command) span.head.content else ""

  override def toString =

    id + "/" + (if (is_command) name else if (is_ignored) "IGNORED" else "MALFORMED")

  /* source text */

  val source: String = span.map(_.source).mkString

  def source(range: Text.Range): String = source.substring(range.start, range.stop)

  def length: Int = source.length

  val range: Text.Range = Text.Range(0, length)

  lazy val symbol_index = new Symbol.Index(source)

  def decode(i: Text.Offset): Text.Offset = symbol_index.decode(i)

  def decode(r: Text.Range): Text.Range = symbol_index.decode(r)

  /* accumulated results */

  val empty_state: Command.State = Command.State(this, Nil, Nil, Markup_Tree.empty)

}