Source Code Cross Referenced for parse_reduce_table.java in  » Parser » CUP-develop » java_cup » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Parser » CUP develop » java_cup 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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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