text: //
  //  Expression.h
  //  iLogo
  //
  //  Created by Yuhua Mai on 10/26/13.
  //  Copyright (c) 2013 Yuhua Mai. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  #import "TurtleCommand.h"
  //#import "Model.h"
  //#import "Parser.h"
  
  @class Model;
  @class Parser;
  
  @interface Expression : NSObject
  {
      
  }
  
  //@property (nonatomic) Model *model;
  //@property (nonatomic) Parser *parser;
  
  - (id)initWithParameter:(NSMutableArray*)commandList andModel:(Model*)model;
  - (void)convert:(NSMutableArray*)commandList;
  - (NSMutableArray*)evaluate:(TurtleCommand*)lastTurtleCommand;
  
  - (Model*)model;
  - (Parser*)parser;
  
  @end
  