public class DiffLexer extends AbstractLexer implements DiffTokens
DiffLexer
is an implementation of the
Lexer
interface for a *.diff or *.patch file.AbstractLexer.DefaultLexerToken
currentPos, textBuffer
TK_ADDITION, TK_HEADER, TK_REMOVAL
TK_EOF, TK_NOT_FOUND
Constructor and Description |
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DiffLexer()
Constructs a default
PropertiesLexer with a starting
position of 0. |
Modifier and Type | Method and Description |
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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.)
|
createLexerToken, getTextBuffer, setTextBuffer
public DiffLexer()
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()
.public int lex(LexerToken lexedToken)
lexedToken
instance passed in to the
call.lex
in interface Lexer
lex
in class AbstractLexer
lexedToken
- the instance passed in where token info is storedlexedToken.getToken()
(for convenience)public void backup()
lex()
will return the last token and offset information found.backup
in interface Lexer
backup
in class AbstractLexer
public void setPosition(int offset)
setPosition
in interface Lexer
setPosition
in class AbstractLexer
offset
- the offset for the next lex()
operation.public static java.lang.String tokenToString(int token)
token
- the token to mappublic static java.lang.String tokenToText(int token)
token
- the token to map