01: package java_cup;
02:
03: import java.util.Enumeration;
04:
05: /** This class represents the complete "reduce-goto" table of the parser.
06: * It has one row for each state in the parse machines, and a column for
07: * each terminal symbol. Each entry contains a state number to shift to
08: * as the last step of a reduce.
09: *
10: * @see java_cup.parse_reduce_row
11: * @version last updated: 11/25/95
12: * @author Scott Hudson
13: */
14: public 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: /* determine how many states we are working with */
26: _num_states = lalr_state.number();
27:
28: /* allocate the array and fill it in with empty rows */
29: under_state = new parse_reduce_row[_num_states];
30: for (int i = 0; i < _num_states; i++)
31: under_state[i] = new parse_reduce_row();
32: }
33:
34: /*-----------------------------------------------------------*/
35: /*--- (Access to) Instance Variables ------------------------*/
36: /*-----------------------------------------------------------*/
37:
38: /** How many rows/states in the machine/table. */
39: protected int _num_states;
40:
41: /** How many rows/states in the machine/table. */
42: public int num_states() {
43: return _num_states;
44: }
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: String result;
58: lalr_state goto_st;
59: int cnt;
60:
61: result = "-------- REDUCE_TABLE --------\n";
62: for (int row = 0; row < num_states(); row++) {
63: result += "From state #" + row + "\n";
64: cnt = 0;
65: for (int col = 0; col < parse_reduce_row.size(); col++) {
66: /* pull out the table entry */
67: goto_st = under_state[row].under_non_term[col];
68:
69: /* if it has action in it, print it */
70: if (goto_st != null) {
71: result += " [non term " + col + "->";
72: result += "state " + goto_st.index() + "]";
73:
74: /* end the line after the 3rd one */
75: cnt++;
76: if (cnt == 3) {
77: result += "\n";
78: cnt = 0;
79: }
80: }
81: }
82: /* finish the line if we haven't just done that */
83: if (cnt != 0)
84: result += "\n";
85: }
86: result += "-----------------------------";
87:
88: return result;
89: }
90:
91: /*-----------------------------------------------------------*/
92:
93: }
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