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oracle.javatools.parser.diff
Class DiffLexer
java.lang.Object
oracle.javatools.parser.AbstractLexer
oracle.javatools.parser.diff.DiffLexer
- All Implemented Interfaces:
- DiffTokens, Lexer
-
public class DiffLexer
- extends AbstractLexer
- implements DiffTokens
The DiffLexer
is an implementation of the Lexer
interface for a *.diff or *.patch file.
Constructor Summary |
DiffLexer()
Constructs a default PropertiesLexer with a starting position of 0. |
Method Summary |
void |
backup()
Unlexes the last found token. |
int |
lex(LexerToken lexedToken)
Scans the text buffer at the current position and returns the token that was found. |
void |
setPosition(int offset)
Sets the current lex (read) position to the given offset in the buffer. |
static java.lang.String |
tokenToString(int token)
Utility routine to map the token to a string representation of the token (for debug printing.) |
static java.lang.String |
tokenToText(int token)
Utility routine to map the token to the original text (if retrievable) of the token (for debug printing.) |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
DiffLexer
public DiffLexer()
- Constructs a default
PropertiesLexer
with a starting position of 0. Clients must call setTextBuffer()
to initialize the text buffer used for the Lexer. To start lexing from an offset other than 0, call setPosition()
.
lex
public int lex(LexerToken lexedToken)
- Scans the text buffer at the current position and returns the token that was found. The token and offset information is also stored in the
lexedToken
instance passed in to the call.
-
- Specified by:
lex
in interface Lexer
- Specified by:
lex
in class AbstractLexer
-
- Parameters:
lexedToken
- the instance passed in where token info is stored
- Returns:
- the token that was found, same as calling
lexedToken.getToken()
(for convenience)
backup
public void backup()
- Unlexes the last found token. The next call to
lex()
will return the last token and offset information found.
-
- Specified by:
backup
in interface Lexer
- Specified by:
backup
in class AbstractLexer
setPosition
public void setPosition(int offset)
- Sets the current lex (read) position to the given offset in the buffer. It is the clients responsibility to ensure that this offset corresponds to the start of the line, otherwise, unexpected (and incorrect) results may occur.
-
- Specified by:
setPosition
in interface Lexer
- Overrides:
setPosition
in class AbstractLexer
-
- Parameters:
offset
- the offset for the next lex()
operation.
tokenToString
public static java.lang.String tokenToString(int token)
- Utility routine to map the token to a string representation of the token (for debug printing.)
-
- Parameters:
token
- the token to map
- Returns:
- a printable representation of the token
tokenToText
public static java.lang.String tokenToText(int token)
- Utility routine to map the token to the original text (if retrievable) of the token (for debug printing.)
-
- Parameters:
token
- the token to map
- Returns:
- a printable representation of the token
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