/*
* STANDARD ML OF NEW JERSEY COPYRIGHT NOTICE, LICENSE AND DISCLAIMER.
*
* Copyright (c) 1989-1998 by Lucent Technologies
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appear in all copies and that both the
* copyright notice and this permission notice and warranty disclaimer appear
* in supporting documentation, and that the name of Lucent Technologies, Bell
* Labs or any Lucent entity not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior permission.
*
* Lucent disclaims all warranties with regard to this software, including all
* implied warranties of merchantability and fitness. In no event shall Lucent
* be liable for any special, indirect or consequential damages or any damages
* whatsoever resulting from loss of use, data or profits, whether in an action
* of contract, negligence or other tortious action, arising out of or in
* connection with the use or performance of this software.
*
* Taken from this URL:
* http://www.smlnj.org/license.html
*
* This license is compatible with the GNU GPL (see section "Standard ML of New
* Jersey Copyright License"):
* http://www.gnu.org/licenses/license-list.html#StandardMLofNJ
*/
/*
* Copyright 1996-1999 by Scott Hudson, Frank Flannery, C. Scott Ananian
*/
package weka.core.parser.java_cup.runtime;
/**
* Defines the Symbol class, which is used to represent all terminals
* and nonterminals while parsing. The lexer should pass CUP Symbols
* and CUP returns a Symbol.
*
* @version last updated: 7/3/96
* @author Frank Flannery
*/
/* ****************************************************************
Class Symbol
what the parser expects to receive from the lexer.
the token is identified as follows:
sym: the symbol type
parse_state: the parse state.
value: is the lexical value of type Object
left : is the left position in the original input file
right: is the right position in the original input file
xleft: is the left position Object in the original input file
xright: is the left position Object in the original input file
******************************************************************/
public class Symbol {
// TUM 20060327: Added new Constructor to provide more flexible way
// for location handling
/*******************************
*******************************/
public Symbol(int id, Symbol left, Symbol right, Object o){
this(id,left.left,right.right,o);
}
public Symbol(int id, Symbol left, Symbol right){
this(id,left.left,right.right);
}
/*******************************
Constructor for l,r values
*******************************/
public Symbol(int id, int l, int r, Object o) {
this(id);
left = l;
right = r;
value = o;
}
/*******************************
Constructor for no l,r values
********************************/
public Symbol(int id, Object o) {
this(id, -1, -1, o);
}
/*****************************
Constructor for no value
***************************/
public Symbol(int id, int l, int r) {
this(id, l, r, null);
}
/***********************************
Constructor for no value or l,r
***********************************/
public Symbol(int sym_num) {
this(sym_num, -1);
left = -1;
right = -1;
}
/***********************************
Constructor to give a start state
***********************************/
Symbol(int sym_num, int state)
{
sym = sym_num;
parse_state = state;
}
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** The symbol number of the terminal or non terminal being represented */
public int sym;
/*. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*/
/** The parse state to be recorded on the parse stack with this symbol.
* This field is for the convenience of the parser and shouldn't be
* modified except by the parser.
*/
public int parse_state;
/** This allows us to catch some errors caused by scanners recycling
* symbols. For the use of the parser only. [CSA, 23-Jul-1999] */
boolean used_by_parser = false;
/*******************************
The data passed to parser
*******************************/
public int left, right;
public Object value;
/*****************************
Printing this token out. (Override for pretty-print).
****************************/
public String toString() { return "#"+sym; }
}