action_part


1   
2   package com.sun.java_cup.internal;
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 com.sun.java_cup.internal.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
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