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com.sun.tools.example.debug.expr

public Class Token

extends Object
implements Serializable
Class Inheritance
All Implemented Interfaces
java.io.Serializable

Describes the input token stream.

Field Summary

Modifier and TypeField and Description
public int
beginColumn

The column number of the first character of this Token.

public int
beginLine

The line number of the first character of this Token.

public int
endColumn

The column number of the last character of this Token.

public int
endLine

The line number of the last character of this Token.

public String
image

The string image of the token.

public int
kind

An integer that describes the kind of this token.

public Token
next

A reference to the next regular (non-special) token from the input stream.

private static final long
serialVersionUID

The version identifier for this Serializable class.

public Token
specialToken

This field is used to access special tokens that occur prior to this token, but after the immediately preceding regular (non-special) token.

Constructor Summary

AccessConstructor and Description
public
Token()

No-argument constructor

public
Token(int kind)

Constructs a new token for the specified Image.

public
Token(int kind, String image)

Constructs a new token for the specified Image and Kind.

Method Summary

Modifier and TypeMethod and Description
public Object
getValue()

An optional attribute value of the Token.

public static Token
newToken(int ofKind, String image)

Returns a new Token object, by default.

public static Token
newToken(int ofKind)

public String
toString()

Overrides java.lang.Object.toString.

Returns the image.

Inherited from java.lang.Object:
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Field Detail

beginColumnback to summary
public int beginColumn

The column number of the first character of this Token.

beginLineback to summary
public int beginLine

The line number of the first character of this Token.

endColumnback to summary
public int endColumn

The column number of the last character of this Token.

endLineback to summary
public int endLine

The line number of the last character of this Token.

imageback to summary
public String image

The string image of the token.

kindback to summary
public int kind

An integer that describes the kind of this token. This numbering system is determined by JavaCCParser, and a table of these numbers is stored in the file ...Constants.java.

nextback to summary
public Token next

A reference to the next regular (non-special) token from the input stream. If this is the last token from the input stream, or if the token manager has not read tokens beyond this one, this field is set to null. This is true only if this token is also a regular token. Otherwise, see below for a description of the contents of this field.

serialVersionUIDback to summary
private static final long serialVersionUID

The version identifier for this Serializable class. Increment only if the serialized form of the class changes.

specialTokenback to summary
public Token specialToken

This field is used to access special tokens that occur prior to this token, but after the immediately preceding regular (non-special) token. If there are no such special tokens, this field is set to null. When there are more than one such special token, this field refers to the last of these special tokens, which in turn refers to the next previous special token through its specialToken field, and so on until the first special token (whose specialToken field is null). The next fields of special tokens refer to other special tokens that immediately follow it (without an intervening regular token). If there is no such token, this field is null.

Constructor Detail

Tokenback to summary
public Token()

No-argument constructor

Tokenback to summary
public Token(int kind)

Constructs a new token for the specified Image.

Tokenback to summary
public Token(int kind, String image)

Constructs a new token for the specified Image and Kind.

Method Detail

getValueback to summary
public Object getValue()

An optional attribute value of the Token. Tokens which are not used as syntactic sugar will often contain meaningful values that will be used later on by the compiler or interpreter. This attribute value is often different from the image. Any subclass of Token that actually wants to return a non-null value can override this method as appropriate.

newTokenback to summary
public static Token newToken(int ofKind, String image)

Returns a new Token object, by default. However, if you want, you can create and return subclass objects based on the value of ofKind. Simply add the cases to the switch for all those special cases. For example, if you have a subclass of Token called IDToken that you want to create if ofKind is ID, simply add something like : case MyParserConstants.ID : return new IDToken(ofKind, image); to the following switch statement. Then you can cast matchedToken variable to the appropriate type and use sit in your lexical actions.

newTokenback to summary
public static Token newToken(int ofKind)
toStringback to summary
public String toString()

Overrides java.lang.Object.toString.

Returns the image.