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!include once #1027630 // Msg

replace LogicRule with BasicLogicRule.

cmodule NewEngineSpike > DynPrintLog {
  L<Msg> msgs;
  bool verbose = true, printNonMatches = true;
  transient new Map facts; // facts to trail
  transient AllOnAllWithOperation<LogicRule, O> rulesAndFacts
    = new(lambda2 applyLogicRuleToFact);

  bool step() { ret rulesAndFacts.step(); }

  void addLogicRule(LogicRule rule) {
    if (verbose) print("New rule: " + rule);
    rulesAndFacts.newA(rule);
  }

  void addFact(O fact) { addFact(fact, "external"); }
  
  void addFact(O fact, O trail) {
    if (!facts.put(fact, trail)) ret;
    if (verbose) print("New fact: " + fact);
    rulesAndFacts.newB(fact);
  }
   
  L factsInOrderOfDefinition() { ret rulesAndFacts.cloneBList(); }  
  
  start-thread {
    if (empty(msgs))
      setField(msgs := mainCruddieLog());
    print("Have " + nMessages(msgs));
    pnlStruct(takeFirst(2, msgs));
    L<Msg> msgs2 = whereFieldIsTrue fromUser(msgs);
    for (Msg msg : takeFirst(5, msgs2))
      addFact(ll(msg, Fragment("was understood correctly")));
    addFact(ll(get(msgs2, 5), Fragment("is a wrong recognition")));

    addLogicRule(new LogicRule(
      ll("$x", Fragment("is a wrong recognition")),
      ll("$x", Fragment("should be corrected"))));

    stepAll(lambda0 step);
  }

  // define what a variable is
  bool isVar(O o) { ret o instanceof S && isDollarVar(o/S); }

  void applyLogicRuleToFact(LogicRule rule, O fact) {
    new LogicRuleApplier ap;
    ap.rule = rule;
    ap.fact = fact;
    ap.verbose = verbose;
    ap.printNonMatches = printNonMatches;
    ap.addRewrittenRHS = lambda2 addRewrittenRHS;
    ap.tools.isVar = lambda1 isVar;
    ap.run();
  }

  void addRewrittenRHS(O o, O trail) {
    if (o cast LogicRule) {
      o.trail = trail;
      addLogicRule(o);
    } else if o is And(O a, O b) {
      addRewrittenRHS(a, o);
      addRewrittenRHS(b, o);
    } else if (o != null)
      addFact(o, trail);
  }
}