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java_cup.runtime

public Class Symbol

Class Inheritance

extends Object

java.lang.Object
java_cup.runtime.Symbol

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.

Author: Frank Flannery
Version: last updated: 7/3/96

Field Summary

Modifier and Type	Field and Description
public int	left The data passed to parser
public int	parse_state The parse state to be recorded on the parse stack with this symbol.
public int	right The data passed to parser
public int	sym The symbol number of the terminal or non terminal being represented
pack-priv boolean	used_by_parser This allows us to catch some errors caused by scanners recycling symbols.
public Object	value

Constructor Summary

Access	Constructor and Description
public	Symbol(int id, int l, int r, Object o) Constructor for l,r values
public	Symbol(int id, Object o) Constructor for no l,r values
public	Symbol(int id, int l, int r) Constructor for no value
public	Symbol(int sym_num) Constructor for no value or l,r
pack-priv	Symbol(int sym_num, int state) Constructor to give a start state

Method Summary

Modifier and Type	Method and Description
public String	toString() Overrides java.lang.Object.toString. Printing this token out.

Inherited from java.lang.Object:: clone equals finalize getClass hashCode notify notifyAll wait wait wait

Field Detail

left	back to summary
public int left The data passed to parser

parse_state	back to summary
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.

right	back to summary
public int right The data passed to parser

sym	back to summary
public int sym The symbol number of the terminal or non terminal being represented

used_by_parser	back to summary
pack-priv 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]

value	back to summary
public Object value

Constructor Detail

Symbol	back to summary
public Symbol(int id, int l, int r, Object o) Constructor for l,r values

Symbol	back to summary
public Symbol(int id, Object o) Constructor for no l,r values

Symbol	back to summary
public Symbol(int id, int l, int r) Constructor for no value

Symbol	back to summary
public Symbol(int sym_num) Constructor for no value or l,r

Symbol	back to summary
pack-priv Symbol(int sym_num, int state) Constructor to give a start state

Method Detail

toString

back to summary

public String toString()

Overrides java.lang.Object.toString.

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

Returns:String

Doc from java.lang.Object.toString.

a string representation of the object.