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      1 
      2 package java_cup;
      3 
      4 /**
      5  * This class represents a part of a production which contains an
      6  * action.  These are eventually eliminated from productions and converted
      7  * to trailing actions by factoring out with a production that derives the
      8  * empty string (and ends with this action).
      9  *
     10  * @see java_cup.production
     11  * @version last update: 11/25/95
     12  * @author Scott Hudson
     13  */
     14 
     15 public class action_part extends production_part {
     16 
     17   /*-----------------------------------------------------------*/
     18   /*--- Constructors ------------------------------------------*/
     19   /*-----------------------------------------------------------*/
     20 
     21   /** Simple constructor.
     22    * @param code_str string containing the actual user code.
     23    */
     24   public action_part(String code_str)
     25     {
     26       super(/* never have a label on code */null);
     27       _code_string = code_str;
     28     }
     29 
     30   /*-----------------------------------------------------------*/
     31   /*--- (Access to) Instance Variables ------------------------*/
     32   /*-----------------------------------------------------------*/
     33 
     34   /** String containing code for the action in question. */
     35   protected String _code_string;
     36 
     37   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
     38 
     39   /** String containing code for the action in question. */
     40   public String code_string() {return _code_string;}
     41 
     42   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
     43 
     44   /** Set the code string. */
     45   public void set_code_string(String new_str) {_code_string = new_str;}
     46 
     47   /*-----------------------------------------------------------*/
     48   /*--- General Methods ---------------------------------------*/
     49   /*-----------------------------------------------------------*/
     50 
     51   /** Override to report this object as an action. */
     52   public boolean is_action() { return true; }
     53 
     54   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
     55 
     56   /** Equality comparison for properly typed object. */
     57   public boolean equals(action_part other)
     58     {
     59       /* compare the strings */
     60       return other != null && super.equals(other) &&
     61          other.code_string().equals(code_string());
     62     }
     63 
     64   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
     65 
     66   /** Generic equality comparison. */
     67   public boolean equals(Object other)
     68     {
     69       if (!(other instanceof action_part))
     70     return false;
     71       else
     72     return equals((action_part)other);
     73     }
     74 
     75   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
     76 
     77   /** Produce a hash code. */
     78   public int hashCode()
     79     {
     80       return super.hashCode() ^
     81          (code_string()==null ? 0 : code_string().hashCode());
     82     }
     83 
     84   /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
     85 
     86   /** Convert to a string.  */
     87   public String toString()
     88     {
     89       return super.toString() + "{" + code_string() + "}";
     90     }
     91 
     92   /*-----------------------------------------------------------*/
     93 };
     94