Class Token

java.lang.Object
  Token

public class Token
extends java.lang.Object

Tokens returned by the scanner. CS536, Fall 2007.

Field Summary

TokenCode	code A code indicating the token class of this token.
int	column The column of the first character of this token.
int	line The line on which this token appears.
java.lang.Object	value The value of this token, if any.

Constructor Summary

Token(TokenCode code, int line, int column)
Creates a new token with null value.

Token(TokenCode code, int line, int column, java.lang.Object value)
Creates a new token.

Method Summary

int	intValue() Returns an integer code corresponding to this token.
java.lang.String	toString() Returns a printable representation of this token.

Methods inherited from class java.lang.Object

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

Field Detail

code

public final TokenCode code

A code indicating the token class of this token.

line

public final int line

The line on which this token appears. The first line of the input file is line 1.

column

public final int column

The column of the first character of this token. The first characater of a line is column 1.

value

public final java.lang.Object value

The value of this token, if any. Otherwise, null.

Constructor Detail

Token

public Token(TokenCode code,
             int line,
             int column,
             java.lang.Object value)

Creates a new token.

Parameters:

code - the token code.

line - the line on which the token appears.

column - the column of the first character of the token.

value - the token value.

Token

public Token(TokenCode code,
             int line,
             int column)

Creates a new token with null value.

Parameters:

code - the code.

line - the line on which the token appears.

column - the column of the first character of the token.

Method Detail

toString

public java.lang.String toString()

Returns a printable representation of this token. The result has the format Token@line,column: display-string(value) or Token@line,column: display-string if value is null. The display-string is code.toString().

Overrides:

toString in class java.lang.Object

Returns:

a String representing this token.

intValue

public int intValue()

Returns an integer code corresponding to this token.

Returns:

the token code.