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; } /*-----------------------------------------------------------*/ }