!7

srecord ToParse(O text) {}
srecord StarPattern(O text) {}
srecord QuotedString(O text) {}
srecord PossibleReplacement(O a, O b) {}

cprint {
  delegate TransformationTrail to TransformersOnObjects.
  transient new TransformersOnObjects too;
  switchable long maxSteps = 1000;
  
  transient F1 starPatternWrapper;

  start-thread {
    S ruleText = [[LineByUser("a * is something like *") => Assumption("* is a noun")]];
    too.add(ToParse(ruleText));
    
    // unpack ToParse
    too.addTransformer(func(ToParse x) { x.text });

    too.addTransformer(f<S, O> splitAtDoubleArrow_pair);
    too.addTransformer(f<S, O> parseFunctionCall);
    too.addTransformer(f<S, O> unquote, f<S, S> quote);
    too.addTransformer(f<Pair, O> pairA);
    too.addTransformer(f<Pair, O> pairB);
    //too.addTransformer(f<S, Bool> isStarPattern);
    
    // Suggest enclosing a star pattern string with StarPattern()
    too.addTransformer(starPatternWrapper = func(QuotedString s) {
      s.text instanceof S && isStarPattern((S) s.text) ? StarPattern(s.text) : null
    });
    
    too.addTransformer(func(S s) { isQuoted(s) ? QuotedString(unquote(s)) : null });
    
    // Reintegrate replaced star patterns into rule text
    too.addTransformer(func(StarPattern s) {
      print("Found StarPattern: " + s);
      O quotedString = too.getTrailBy(s, starPatternWrapper).argument;
      too.PossibleReplacement(quotedString, s);
      null;
    });
    
    too.addTransformer(voidfunc(PossibleReplacement r) {
      replaceInSource(r.a, r.b)
    });
      
    stepAllWithStats(too, maxSteps);
    too.printWithTrails();
  }
  
  // replace a in b inside of where a came from
  void replaceInSource(O a, O b) {
    print(formatFunctionCall replaceInSource(a, b));
    
    // Find trails of a
    Cl<TransformationTrail> trails2 = too.getTrails(a);
    
    fOr (TransformationTrail trail2 : trails2) {
      F1 back = too.getBackTransformer(trail2.transformer);
      print("  Path back: " + trail2 + " >> " + back);
      if (back != null) {
        // Backtransform b (if possible) and put in pool
        O c = callFIfActuallyCallable(back, b);
        print("  >> " + c);
        too.addObject(c, "replaceInSource");
      }
    }
  }
}