java_cup.runtime
Class Symbol

java.lang.Object
  java_cup.runtime.Symbol

public class Symbol

extends java.lang.Object

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.

Field Summary

int	left The data passed to parser
int	parse_state The parse state to be recorded on the parse stack with this symbol.
int	right The data passed to parser
int	sym The symbol number of the terminal or non terminal being represented
(package private) boolean	used_by_parser This allows us to catch some errors caused by scanners recycling symbols.
java.lang.Object	value

Constructor Summary

	Symbol(int sym_num) Constructor for no value or l,r
(package private)	Symbol(int sym_num, int state) Constructor to give a start state
	Symbol(int id, int l, int r) Constructor for no value
	Symbol(int id, int l, int r, java.lang.Object o) Constructor for l,r values
	Symbol(int id, java.lang.Object o) Constructor for no l,r values

Method Summary

java.lang.String

toString() Printing this token out.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

sym

public int sym

The symbol number of the terminal or non terminal being represented

parse_state

public int parse_state

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.

used_by_parser

boolean used_by_parser

This allows us to catch some errors caused by scanners recycling symbols. For the use of the parser only. [CSA, 23-Jul-1999]

left

public int left

The data passed to parser

right

public int right

The data passed to parser

value

public java.lang.Object value

Constructor Detail

Symbol

public Symbol(int id,
              int l,
              int r,
              java.lang.Object o)

Constructor for l,r values

Symbol

public Symbol(int id,
              java.lang.Object o)

Constructor for no l,r values

Symbol

public Symbol(int id,
              int l,
              int r)

Constructor for no value

Symbol

public Symbol(int sym_num)

Constructor for no value or l,r

Symbol

Symbol(int sym_num,
       int state)

Constructor to give a start state

Method Detail

toString

public java.lang.String toString()

Printing this token out. (Override for pretty-print).