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