public ConditionChecker(Evaluator evaluator)
 {
     _evaluator = evaluator;
 }
 public ConditionChecker(Evaluator evaluator, Preprocessor preprocessor)
 {
     _evaluator = evaluator;
     _preprocessor = preprocessor;
 }
 public ConditionChecker(Evaluator evaluator, Preprocessor preprocessor)
 {
     _evaluator    = evaluator;
     _preprocessor = preprocessor;
 }