1
2package java_cup;
3
4
5/** This class represents the complete "reduce-goto" table of the parser.
6 *  It has one row for each state in the parse machines, and a column for
7 *  each terminal symbol.  Each entry contains a state number to shift to
8 *  as the last step of a reduce.
9 *
10 * @see     java_cup.parse_reduce_row
11 * @version last updated: 11/25/95
12 * @author  Scott Hudson
13 */
14public class parse_reduce_table {
15
16  /*-----------------------------------------------------------*/
17  /*--- Constructor(s) ----------------------------------------*/
18  /*-----------------------------------------------------------*/
19
20  /** Simple constructor.  Note: all terminals, non-terminals, and productions
21   *  must already have been entered, and the viable prefix recognizer should
22   *  have been constructed before this is called.
23   */
24  public parse_reduce_table()
25    {
26      /* determine how many states we are working with */
27      _num_states = lalr_state.number();
28
29      /* allocate the array and fill it in with empty rows */
30      under_state = new parse_reduce_row[_num_states];
31      for (int i=0; i<_num_states; i++)
32    under_state[i] = new parse_reduce_row();
33    }
34
35
36  /*-----------------------------------------------------------*/
37  /*--- (Access to) Instance Variables ------------------------*/
38  /*-----------------------------------------------------------*/
39
40  /** How many rows/states in the machine/table. */
41  protected int _num_states;
42
43  /** How many rows/states in the machine/table. */
44  public int num_states() {return _num_states;}
45
46  /*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
47
48  /** Actual array of rows, one per state */
49  public  parse_reduce_row[] under_state;
50
51  /*-----------------------------------------------------------*/
52  /*--- General Methods ---------------------------------------*/
53  /*-----------------------------------------------------------*/
54
55  /** Convert to a string. */
56  public String toString()
57    {
58      String result;
59      lalr_state goto_st;
60      int cnt;
61
62      result = "-------- REDUCE_TABLE --------\n";
63      for (int row = 0; row < num_states(); row++)
64    {
65      result += "From state #" + row + "\n";
66      cnt = 0;
67      for (int col = 0; col < under_state[row].size(); col++)
68        {
69          /* pull out the table entry */
70          goto_st = under_state[row].under_non_term[col];
71
72          /* if it has action in it, print it */
73          if (goto_st != null)
74        {
75          result += col + ":";
76          result += goto_st.index();
77
78          /* end the line after the 3rd one */
79          cnt++;
80          if (cnt == 3)
81            {
82              result += "\n";
83              cnt = 0;
84            }
85        }
86        }
87          /* finish the line if we haven't just done that */
88      if (cnt != 0) result += "\n";
89    }
90      result += "-----------------------------";
91
92      return result;
93    }
94
95  /*-----------------------------------------------------------*/
96
97};
98
99