src/Tools/jEdit/src/prover/Prover.scala

original sources from Johannes Hölzl a48e0c6ab1aea77c52d596f7efc007a543d3d10c with minor modifications of directory layout;

package isabelle.prover

import scala.collection.mutable.{ HashMap, HashSet }

import java.util.Properties

import javax.swing.SwingUtilities

import isabelle.proofdocument.{ ProofDocument, Text }
import isabelle.IsabelleProcess.Result
import isabelle.YXML.parse_failsafe
import isabelle.XML.{ Elem, Tree }
import isabelle.Symbol.Interpretation
import isabelle.IsabelleSyntax.{ encode_properties, encode_string }

import isabelle.utils.EventSource

import Command.Phase

class Prover() {
  val converter = new Interpretation()

  private var _logic = "HOL"
  private var process = null : IsabelleProcess
  private var commands = new HashMap[String, Command]
  
  val commandKeywords = new HashSet[String]
  private var initialized = false
    
  val activated = new EventSource[Unit]
  val commandInfo = new EventSource[CommandChangeInfo]
  val outputInfo = new EventSource[String]
  var document = null : Document
  
  var workerThread = new Thread("isabelle.Prover: worker") {
    override def run() : Unit = {
      while (true) {
        val r = process.get_result
        
        val id = if (r.props != null) r.props.getProperty("id") else null
        val st = if (id != null) commands.getOrElse(id, null) else null
        
        if (r.kind == IsabelleProcess.Kind.EXIT)
          return
        else if (r.kind == IsabelleProcess.Kind.STDOUT 
                 || r.kind == IsabelleProcess.Kind.STDIN)
          inUIThread(() => outputInfo.fire(r.result))
        else if (r.kind == IsabelleProcess.Kind.WRITELN && !initialized) {
          initialized = true
          inUIThread(() => 
            if (document != null) {
              document.activate()
              activated.fire(())
            }
          )
        }
        else {
          val tree = parse_failsafe(converter.decode(r.result))
          tree match {
            case Elem("message", _, List(Elem("command_decl", List(("name", name), 
                                                                   ("kind", _)), _))) =>
              commandKeywords.addEntry(name)
            case _ =>
              if (st != null)
                handleResult(st, r, tree)
          }
        }
        
      }
    }
  }
  
  def handleResult(st : Command, r : Result, tree : XML.Tree) {
    def fireChange() = 
      inUIThread(() => commandInfo.fire(new CommandChangeInfo(st)))
    
    r.kind match {
      case IsabelleProcess.Kind.ERROR => 
        if (st.phase != Phase.REMOVED && st.phase != Phase.REMOVE)
          st.phase = Phase.FAILED
        st.addResult(tree)
        fireChange()
        
      case IsabelleProcess.Kind.WRITELN =>
        st.addResult(tree)
        fireChange()
        
      case IsabelleProcess.Kind.PRIORITY =>
        st.addResult(tree)
        fireChange()
              
      case IsabelleProcess.Kind.WARNING =>
        st.addResult(tree)
        fireChange()
              
      case IsabelleProcess.Kind.STATUS =>
        val state = tree match { case Elem("message", _, 
                                           Elem (name, _, _) :: _) => name
                                 case _ => null }
        if (st.phase != Phase.REMOVED && st.phase != Phase.REMOVE) {
          state match {
            case "finished" => 
              st.phase = Phase.FINISHED
              fireChange()
              
            case "unprocessed" => 
              st.phase = Phase.UNPROCESSED
              fireChange()
                    
            case "failed" => 
              st.phase = Phase.FAILED
              fireChange()
                    
            case "removed" =>
              commands.removeKey(st.idString)
              st.phase = Phase.REMOVED
              fireChange()
              
            case _ =>
          }
        }
      case _ =>
    }
  }
  
  def logic = _logic
  
  def start(logic : String) {
    if (logic != null)
      _logic = logic
    process = new IsabelleProcess("-m", "xsymbols", _logic)
    workerThread.start
  }

  def stop() {
    process.kill
  }
  
  private def inUIThread(runnable : () => Unit) {
    SwingUtilities invokeAndWait new Runnable() {
      override def run() { runnable() }
    }
  }
  
  def setDocument(text : Text, path : String) {
    this.document = new Document(text, this)
    process.ML("ThyLoad.add_path " + encode_string(path))

    document.structuralChanges.add(changes => {
      for (cmd <- changes.removedCommands) remove(cmd)
      for (cmd <- changes.addedCommands) send(cmd)
    })
    if (initialized) {
      document.activate()
      activated.fire(())
    }
  }
  
  private def send(cmd : Command) {
    commands.put(cmd.idString, cmd)
    
    val props = new Properties()
    props.setProperty("id", cmd.idString)
    props.setProperty("offset", "1")

    val content = converter.encode(document.getContent(cmd))
    process.output_sync("Isar.command " 
                        + encode_properties(props)
                        + " "
                        + encode_string(content))
    
    process.output_sync("Isar.insert "
                        + encode_string(if (cmd.previous == null) "" 
                                        else cmd.previous.idString)
                        + " "
                        + encode_string(cmd.idString))
    
    cmd.phase = Phase.UNPROCESSED
  }
  
  def remove(cmd : Command) {
    cmd.phase = Phase.REMOVE
    process.output_sync("Isar.remove " + encode_string(cmd.idString))
  }
}