bsh
Class Token
java.lang.Object
|
+--bsh.Token
- All Implemented Interfaces:
- java.io.Serializable
- public class Token
- extends java.lang.Object
- implements java.io.Serializable
Describes the input token stream.
- See Also:
- Serialized Form
Field Summary |
int |
beginColumn
beginLine and beginColumn describe the position of the first character
of this token; endLine and endColumn describe the position of the
last character of this token. |
int |
beginLine
beginLine and beginColumn describe the position of the first character
of this token; endLine and endColumn describe the position of the
last character of this token. |
int |
endColumn
beginLine and beginColumn describe the position of the first character
of this token; endLine and endColumn describe the position of the
last character of this token. |
int |
endLine
beginLine and beginColumn describe the position of the first character
of this token; endLine and endColumn describe the position of the
last character of this token. |
java.lang.String |
image
The string image of the token. |
int |
kind
An integer that describes the kind of this token. |
Token |
next
A reference to the next regular (non-special) token from the input
stream. |
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 |
Token()
|
Method Summary |
static Token |
newToken(int ofKind)
Returns a new Token object, by default. |
java.lang.String |
toString()
Returns the image. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
kind
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.
beginLine
public int beginLine
- beginLine and beginColumn describe the position of the first character
of this token; endLine and endColumn describe the position of the
last character of this token.
beginColumn
public int beginColumn
- beginLine and beginColumn describe the position of the first character
of this token; endLine and endColumn describe the position of the
last character of this token.
endLine
public int endLine
- beginLine and beginColumn describe the position of the first character
of this token; endLine and endColumn describe the position of the
last character of this token.
endColumn
public int endColumn
- beginLine and beginColumn describe the position of the first character
of this token; endLine and endColumn describe the position of the
last character of this token.
image
public java.lang.String image
- The string image of the token.
next
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.
specialToken
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.
Token
public Token()
toString
public java.lang.String toString()
- Returns the image.
- Overrides:
toString
in class java.lang.Object
newToken
public static final Token newToken(int ofKind)
- 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, simlpy add something like :
case MyParserConstants.ID : return new IDToken();
to the following switch statement. Then you can cast matchedToken
variable to the appropriate type and use it in your lexical actions.
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